[mirror_ubuntu-bionic-kernel.git] / fs / aufs / dir.h

/*
 * Copyright (C) 2005-2017 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);
void au_dir_ts(struct inode *dir, aufs_bindex_t bsrc);
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
AuStub(long, au_rdu_ioctl, return -EINVAL, struct file *file,
       unsigned int cmd, unsigned long arg)
#ifdef CONFIG_COMPAT
AuStub(long, au_rdu_compat_ioctl, return -EINVAL, struct file *file,
       unsigned int cmd, unsigned long arg)
#endif
#endif

#endif /* __KERNEL__ */
#endif /* __AUFS_DIR_H__ */
Commit	Line	Data
c088e31d SF	1	/*
	2	* Copyright (C) 2005-2017 Junjiro R. Okajima
	3	*
	4	* This program, aufs is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation; either version 2 of the License, or
	7	* (at your option) any later version.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	16	*/
	17
	18	/*
	19	* directory operations
	20	*/
	21
	22	#ifndef __AUFS_DIR_H__
	23	#define __AUFS_DIR_H__
	24
	25	#ifdef __KERNEL__
	26
	27	#include <linux/fs.h>
	28
	29	/* ---------------------------------------------------------------------- */
	30
	31	/* need to be faster and smaller */
	32
	33	struct au_nhash {
	34	unsigned int nh_num;
	35	struct hlist_head *nh_head;
	36	};
	37
	38	struct au_vdir_destr {
	39	unsigned char len;
	40	unsigned char name[0];
	41	} __packed;
	42
	43	struct au_vdir_dehstr {
	44	struct hlist_node hash;
	45	struct au_vdir_destr *str;
	46	} ____cacheline_aligned_in_smp;
	47
	48	struct au_vdir_de {
	49	ino_t de_ino;
	50	unsigned char de_type;
	51	/* caution: packed */
	52	struct au_vdir_destr de_str;
	53	} __packed;
	54
	55	struct au_vdir_wh {
	56	struct hlist_node wh_hash;
	57	#ifdef CONFIG_AUFS_SHWH
	58	ino_t wh_ino;
	59	aufs_bindex_t wh_bindex;
	60	unsigned char wh_type;
	61	#else
	62	aufs_bindex_t wh_bindex;
	63	#endif
	64	/* caution: packed */
65	struct au_vdir_destr wh_str;
66	} __packed;
67
68	union au_vdir_deblk_p {
69	unsigned char *deblk;
70	struct au_vdir_de *de;
71	};
72
73	struct au_vdir {
74	unsigned char **vd_deblk;
75	unsigned long vd_nblk;
76	struct {
77	unsigned long ul;
78	union au_vdir_deblk_p p;
79	} vd_last;
80
81	unsigned long vd_version;
82	unsigned int vd_deblk_sz;
83	unsigned long vd_jiffy;
84	} ____cacheline_aligned_in_smp;
85
86	/* ---------------------------------------------------------------------- */
87
88	/* dir.c */
89	extern const struct file_operations aufs_dir_fop;
90	void au_add_nlink(struct inode dir, struct inode h_dir);
91	void au_sub_nlink(struct inode dir, struct inode h_dir);
92	loff_t au_dir_size(struct file file, struct dentry dentry);
93	void au_dir_ts(struct inode *dir, aufs_bindex_t bsrc);
94	int au_test_empty_lower(struct dentry *dentry);
95	int au_test_empty(struct dentry dentry, struct au_nhash whlist);
96
97	/* vdir.c */
98	unsigned int au_rdhash_est(loff_t sz);
99	int au_nhash_alloc(struct au_nhash *nhash, unsigned int num_hash, gfp_t gfp);
100	void au_nhash_wh_free(struct au_nhash *whlist);
101	int au_nhash_test_longer_wh(struct au_nhash *whlist, aufs_bindex_t btgt,
102	int limit);
103	int au_nhash_test_known_wh(struct au_nhash whlist, char name, int nlen);
104	int au_nhash_append_wh(struct au_nhash whlist, char name, int nlen, ino_t ino,
105	unsigned int d_type, aufs_bindex_t bindex,
106	unsigned char shwh);
107	void au_vdir_free(struct au_vdir *vdir);
108	int au_vdir_init(struct file *file);
109	int au_vdir_fill_de(struct file file, struct dir_context ctx);
110
111	/* ioctl.c */
112	long aufs_ioctl_dir(struct file *file, unsigned int cmd, unsigned long arg);
113
114	#ifdef CONFIG_AUFS_RDU
115	/* rdu.c */
116	long au_rdu_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
117	#ifdef CONFIG_COMPAT
118	long au_rdu_compat_ioctl(struct file *file, unsigned int cmd,
119	unsigned long arg);
120	#endif
121	#else
122	AuStub(long, au_rdu_ioctl, return -EINVAL, struct file *file,
123	unsigned int cmd, unsigned long arg)
124	#ifdef CONFIG_COMPAT
125	AuStub(long, au_rdu_compat_ioctl, return -EINVAL, struct file *file,
126	unsigned int cmd, unsigned long arg)
127	#endif
128	#endif
129
130	#endif /* __KERNEL__ */
131	#endif /* __AUFS_DIR_H__ */