1/*
2 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
8 */
9
10#ifndef __DIR_DOT_H__
11#define __DIR_DOT_H__
12
13#include <linux/dcache.h>
14
15struct inode;
16struct gfs2_inode;
17struct gfs2_inum;
18
19int gfs2_dir_search(struct inode *dir, const struct qstr *filename,
20		    struct gfs2_inum_host *inum, unsigned int *type);
21int gfs2_dir_add(struct inode *inode, const struct qstr *filename,
22		 const struct gfs2_inum_host *inum, unsigned int type);
23int gfs2_dir_del(struct gfs2_inode *dip, const struct qstr *filename);
24int gfs2_dir_read(struct inode *inode, u64 *offset, void *opaque,
25		  filldir_t filldir);
26int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
27		   struct gfs2_inum_host *new_inum, unsigned int new_type);
28
29int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip);
30
31int gfs2_diradd_alloc_required(struct inode *dir,
32			       const struct qstr *filename);
33int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
34			    struct buffer_head **bhp);
35
36static inline u32 gfs2_disk_hash(const char *data, int len)
37{
38        return crc32_le((u32)~0, data, len) ^ (u32)~0;
39}
40
41
42static inline void gfs2_str2qstr(struct qstr *name, const char *fname)
43{
44	name->name = fname;
45	name->len = strlen(fname);
46	name->hash = gfs2_disk_hash(name->name, name->len);
47}
48
49/* N.B. This probably ought to take inum & type as args as well */
50static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent)
51{
52	dent->de_inum.no_addr = cpu_to_be64(0);
53	dent->de_inum.no_formal_ino = cpu_to_be64(0);
54	dent->de_hash = cpu_to_be32(name->hash);
55	dent->de_rec_len = cpu_to_be16(reclen);
56	dent->de_name_len = cpu_to_be16(name->len);
57	dent->de_type = cpu_to_be16(0);
58	memset(dent->__pad, 0, sizeof(dent->__pad));
59	memcpy(dent + 1, name->name, name->len);
60}
61
62#endif /* __DIR_DOT_H__ */
63