File: dir.h

package info (click to toggle)
linux 3.16.56-1+deb8u1
  • links: PTS, VCS
  • area: main
  • in suites: jessie
  • size: 739,780 kB
  • sloc: ansic: 12,238,760; asm: 277,795; perl: 53,071; xml: 47,771; makefile: 30,548; sh: 7,977; python: 6,699; cpp: 5,132; yacc: 4,254; lex: 2,215; awk: 741; pascal: 231; lisp: 218; sed: 30
file content (136 lines) | stat: -rw-r--r-- 3,649 bytes parent folder | download | duplicates (13)
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
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
/*
 * Copyright (C) 2005-2014 Junjiro R. Okajima
 *
 * This program, aufs is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/*
 * directory operations
 */

#ifndef __AUFS_DIR_H__
#define __AUFS_DIR_H__

#ifdef __KERNEL__

#include <linux/fs.h>

/* ---------------------------------------------------------------------- */

/* need to be faster and smaller */

struct au_nhash {
	unsigned int		nh_num;
	struct hlist_head	*nh_head;
};

struct au_vdir_destr {
	unsigned char	len;
	unsigned char	name[0];
} __packed;

struct au_vdir_dehstr {
	struct hlist_node	hash;
	struct au_vdir_destr	*str;
} ____cacheline_aligned_in_smp;

struct au_vdir_de {
	ino_t			de_ino;
	unsigned char		de_type;
	/* caution: packed */
	struct au_vdir_destr	de_str;
} __packed;

struct au_vdir_wh {
	struct hlist_node	wh_hash;
#ifdef CONFIG_AUFS_SHWH
	ino_t			wh_ino;
	aufs_bindex_t		wh_bindex;
	unsigned char		wh_type;
#else
	aufs_bindex_t		wh_bindex;
#endif
	/* caution: packed */
	struct au_vdir_destr	wh_str;
} __packed;

union au_vdir_deblk_p {
	unsigned char		*deblk;
	struct au_vdir_de	*de;
};

struct au_vdir {
	unsigned char	**vd_deblk;
	unsigned long	vd_nblk;
	struct {
		unsigned long		ul;
		union au_vdir_deblk_p	p;
	} vd_last;

	unsigned long	vd_version;
	unsigned int	vd_deblk_sz;
	unsigned long	vd_jiffy;
} ____cacheline_aligned_in_smp;

/* ---------------------------------------------------------------------- */

/* dir.c */
extern const struct file_operations aufs_dir_fop;
void au_add_nlink(struct inode *dir, struct inode *h_dir);
void au_sub_nlink(struct inode *dir, struct inode *h_dir);
loff_t au_dir_size(struct file *file, struct dentry *dentry);
int au_test_empty_lower(struct dentry *dentry);
int au_test_empty(struct dentry *dentry, struct au_nhash *whlist);

/* vdir.c */
unsigned int au_rdhash_est(loff_t sz);
int au_nhash_alloc(struct au_nhash *nhash, unsigned int num_hash, gfp_t gfp);
void au_nhash_wh_free(struct au_nhash *whlist);
int au_nhash_test_longer_wh(struct au_nhash *whlist, aufs_bindex_t btgt,
			    int limit);
int au_nhash_test_known_wh(struct au_nhash *whlist, char *name, int nlen);
int au_nhash_append_wh(struct au_nhash *whlist, char *name, int nlen, ino_t ino,
		       unsigned int d_type, aufs_bindex_t bindex,
		       unsigned char shwh);
void au_vdir_free(struct au_vdir *vdir);
int au_vdir_init(struct file *file);
int au_vdir_fill_de(struct file *file, struct dir_context *ctx);

/* ioctl.c */
long aufs_ioctl_dir(struct file *file, unsigned int cmd, unsigned long arg);

#ifdef CONFIG_AUFS_RDU
/* rdu.c */
long au_rdu_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
#ifdef CONFIG_COMPAT
long au_rdu_compat_ioctl(struct file *file, unsigned int cmd,
			 unsigned long arg);
#endif
#else
static inline long au_rdu_ioctl(struct file *file, unsigned int cmd,
				unsigned long arg)
{
	return -EINVAL;
}
#ifdef CONFIG_COMPAT
static inline long au_rdu_compat_ioctl(struct file *file, unsigned int cmd,
				       unsigned long arg)
{
	return -EINVAL;
}
#endif
#endif

#endif /* __KERNEL__ */
#endif /* __AUFS_DIR_H__ */