Root/fs/ocfs2/dir.h

1/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * dir.h
5 *
6 * Function prototypes
7 *
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public
21 * License along with this program; if not, write to the
22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 * Boston, MA 021110-1307, USA.
24 */
25
26#ifndef OCFS2_DIR_H
27#define OCFS2_DIR_H
28
29struct ocfs2_dx_hinfo {
30    u32 major_hash;
31    u32 minor_hash;
32};
33
34struct ocfs2_dir_lookup_result {
35    struct buffer_head *dl_leaf_bh; /* Unindexed leaf
36                             * block */
37    struct ocfs2_dir_entry *dl_entry; /* Target dirent in
38                             * unindexed leaf */
39
40    struct buffer_head *dl_dx_root_bh; /* Root of indexed
41                             * tree */
42
43    struct buffer_head *dl_dx_leaf_bh; /* Indexed leaf block */
44    struct ocfs2_dx_entry *dl_dx_entry; /* Target dx_entry in
45                             * indexed leaf */
46    struct ocfs2_dx_hinfo dl_hinfo; /* Name hash results */
47
48    struct buffer_head *dl_prev_leaf_bh;/* Previous entry in
49                              * dir free space
50                              * list. NULL if
51                              * previous entry is
52                              * dx root block. */
53};
54
55void ocfs2_free_dir_lookup_result(struct ocfs2_dir_lookup_result *res);
56
57int ocfs2_find_entry(const char *name, int namelen,
58             struct inode *dir,
59             struct ocfs2_dir_lookup_result *lookup);
60int ocfs2_delete_entry(handle_t *handle,
61               struct inode *dir,
62               struct ocfs2_dir_lookup_result *res);
63int __ocfs2_add_entry(handle_t *handle,
64              struct inode *dir,
65              const char *name, int namelen,
66              struct inode *inode, u64 blkno,
67              struct buffer_head *parent_fe_bh,
68              struct ocfs2_dir_lookup_result *lookup);
69static inline int ocfs2_add_entry(handle_t *handle,
70                  struct dentry *dentry,
71                  struct inode *inode, u64 blkno,
72                  struct buffer_head *parent_fe_bh,
73                  struct ocfs2_dir_lookup_result *lookup)
74{
75    return __ocfs2_add_entry(handle, dentry->d_parent->d_inode,
76                 dentry->d_name.name, dentry->d_name.len,
77                 inode, blkno, parent_fe_bh, lookup);
78}
79int ocfs2_update_entry(struct inode *dir, handle_t *handle,
80               struct ocfs2_dir_lookup_result *res,
81               struct inode *new_entry_inode);
82
83int ocfs2_check_dir_for_entry(struct inode *dir,
84                  const char *name,
85                  int namelen);
86int ocfs2_empty_dir(struct inode *inode);
87
88int ocfs2_find_files_on_disk(const char *name,
89                 int namelen,
90                 u64 *blkno,
91                 struct inode *inode,
92                 struct ocfs2_dir_lookup_result *res);
93int ocfs2_lookup_ino_from_name(struct inode *dir, const char *name,
94                   int namelen, u64 *blkno);
95int ocfs2_readdir(struct file *filp, void *dirent, filldir_t filldir);
96int ocfs2_dir_foreach(struct inode *inode, loff_t *f_pos, void *priv,
97              filldir_t filldir);
98int ocfs2_prepare_dir_for_insert(struct ocfs2_super *osb,
99                 struct inode *dir,
100                 struct buffer_head *parent_fe_bh,
101                 const char *name,
102                 int namelen,
103                 struct ocfs2_dir_lookup_result *lookup);
104struct ocfs2_alloc_context;
105int ocfs2_fill_new_dir(struct ocfs2_super *osb,
106               handle_t *handle,
107               struct inode *parent,
108               struct inode *inode,
109               struct buffer_head *fe_bh,
110               struct ocfs2_alloc_context *data_ac,
111               struct ocfs2_alloc_context *meta_ac);
112
113int ocfs2_dx_dir_truncate(struct inode *dir, struct buffer_head *di_bh);
114
115struct ocfs2_dir_block_trailer *ocfs2_dir_trailer_from_size(int blocksize,
116                                void *data);
117#endif /* OCFS2_DIR_H */
118

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