aboutsummaryrefslogtreecommitdiffstats
path: root/fs/gfs2/dir.h
blob: 4f03bbd1873f4173faa9d20d2be09b9b1a0f4413 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU General Public License version 2.
 */

#ifndef __DIR_DOT_H__
#define __DIR_DOT_H__

#include <linux/dcache.h>
#include <linux/crc32.h>

struct inode;
struct gfs2_inode;
struct gfs2_inum;

extern struct inode *gfs2_dir_search(struct inode *dir,
				     const struct qstr *filename,
				     bool fail_on_exist);
extern int gfs2_dir_check(struct inode *dir, const struct qstr *filename,
			  const struct gfs2_inode *ip);
extern int gfs2_dir_add(struct inode *inode, const struct qstr *filename,
			const struct gfs2_inode *ip);
extern int gfs2_dir_del(struct gfs2_inode *dip, const struct dentry *dentry);
extern int gfs2_dir_read(struct inode *inode, struct dir_context *ctx,
			 struct file_ra_state *f_ra);
extern int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
			  const struct gfs2_inode *nip, unsigned int new_type);

extern int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip);

extern int gfs2_diradd_alloc_required(struct inode *dir,
				      const struct qstr *filename);
extern int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
				   struct buffer_head **bhp);
extern void gfs2_dir_hash_inval(struct gfs2_inode *ip);

static inline u32 gfs2_disk_hash(const char *data, int len)
{
        return crc32_le((u32)~0, data, len) ^ (u32)~0;
}


static inline void gfs2_str2qstr(struct qstr *name, const char *fname)
{
	name->name = fname;
	name->len = strlen(fname);
	name->hash = gfs2_disk_hash(name->name, name->len);
}

/* N.B. This probably ought to take inum & type as args as well */
static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent)
{
	dent->de_inum.no_addr = cpu_to_be64(0);
	dent->de_inum.no_formal_ino = cpu_to_be64(0);
	dent->de_hash = cpu_to_be32(name->hash);
	dent->de_rec_len = cpu_to_be16(reclen);
	dent->de_name_len = cpu_to_be16(name->len);
	dent->de_type = cpu_to_be16(0);
	memset(dent->__pad, 0, sizeof(dent->__pad));
	memcpy(dent + 1, name->name, name->len);
}

extern struct qstr gfs2_qdot;
extern struct qstr gfs2_qdotdot;

#endif /* __DIR_DOT_H__ */