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/*
* 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__ */
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