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 
29 struct ocfs2_dx_hinfo {
30 	u32	major_hash;
31 	u32	minor_hash;
32 };
33 
34 struct 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 
55 void ocfs2_free_dir_lookup_result(struct ocfs2_dir_lookup_result *res);
56 
57 int ocfs2_find_entry(const char *name, int namelen,
58 		     struct inode *dir,
59 		     struct ocfs2_dir_lookup_result *lookup);
60 int ocfs2_delete_entry(handle_t *handle,
61 		       struct inode *dir,
62 		       struct ocfs2_dir_lookup_result *res);
63 int __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);
ocfs2_add_entry(handle_t * handle,struct dentry * dentry,struct inode * inode,u64 blkno,struct buffer_head * parent_fe_bh,struct ocfs2_dir_lookup_result * lookup)69 static 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, d_inode(dentry->d_parent),
76 				 dentry->d_name.name, dentry->d_name.len,
77 				 inode, blkno, parent_fe_bh, lookup);
78 }
79 int ocfs2_update_entry(struct inode *dir, handle_t *handle,
80 		       struct ocfs2_dir_lookup_result *res,
81 		       struct inode *new_entry_inode);
82 
83 int ocfs2_check_dir_for_entry(struct inode *dir,
84 			      const char *name,
85 			      int namelen);
86 int ocfs2_empty_dir(struct inode *inode);
87 
88 int 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);
93 int ocfs2_lookup_ino_from_name(struct inode *dir, const char *name,
94 			       int namelen, u64 *blkno);
95 int ocfs2_readdir(struct file *file, struct dir_context *ctx);
96 int ocfs2_dir_foreach(struct inode *inode, struct dir_context *ctx);
97 int ocfs2_prepare_dir_for_insert(struct ocfs2_super *osb,
98 				 struct inode *dir,
99 				 struct buffer_head *parent_fe_bh,
100 				 const char *name,
101 				 int namelen,
102 				 struct ocfs2_dir_lookup_result *lookup);
103 struct ocfs2_alloc_context;
104 int ocfs2_fill_new_dir(struct ocfs2_super *osb,
105 		       handle_t *handle,
106 		       struct inode *parent,
107 		       struct inode *inode,
108 		       struct buffer_head *fe_bh,
109 		       struct ocfs2_alloc_context *data_ac,
110 		       struct ocfs2_alloc_context *meta_ac);
111 
112 int ocfs2_dx_dir_truncate(struct inode *dir, struct buffer_head *di_bh);
113 
114 struct ocfs2_dir_block_trailer *ocfs2_dir_trailer_from_size(int blocksize,
115 							    void *data);
116 #endif /* OCFS2_DIR_H */
117