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/*
* Copyright (C) 2005-2011 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* sub-routines for VFS
*/
#ifndef __AUFS_VFSUB_H__
#define __AUFS_VFSUB_H__
#ifdef __KERNEL__
#include <linux/fs.h>
#include <linux/lglock.h>
#include "debug.h"
/* copied from linux/fs/internal.h */
/* todo: BAD approach!! */
DECLARE_BRLOCK(vfsmount_lock);
extern void file_sb_list_del(struct file *f);
extern spinlock_t inode_sb_list_lock;
/* copied from linux/fs/file_table.c */
DECLARE_LGLOCK(files_lglock);
#ifdef CONFIG_SMP
/*
* These macros iterate all files on all CPUs for a given superblock.
* files_lglock must be held globally.
*/
#define do_file_list_for_each_entry(__sb, __file) \
{ \
int i; \
for_each_possible_cpu(i) { \
struct list_head *list; \
list = per_cpu_ptr((__sb)->s_files, i); \
list_for_each_entry((__file), list, f_u.fu_list)
#define while_file_list_for_each_entry \
} \
}
#else
#define do_file_list_for_each_entry(__sb, __file) \
{ \
struct list_head *list; \
list = &(sb)->s_files; \
list_for_each_entry((__file), list, f_u.fu_list)
#define while_file_list_for_each_entry \
}
#endif
/* ---------------------------------------------------------------------- */
/* lock subclass for lower inode */
/* default MAX_LOCKDEP_SUBCLASSES(8) is not enough */
/* reduce? gave up. */
enum {
AuLsc_I_Begin = I_MUTEX_QUOTA, /* 4 */
AuLsc_I_PARENT, /* lower inode, parent first */
AuLsc_I_PARENT2, /* copyup dirs */
AuLsc_I_PARENT3, /* copyup wh */
AuLsc_I_CHILD,
AuLsc_I_CHILD2,
AuLsc_I_End
};
/* to debug easier, do not make them inlined functions */
#define MtxMustLock(mtx) AuDebugOn(!mutex_is_locked(mtx))
#define IMustLock(i) MtxMustLock(&(i)->i_mutex)
/* ---------------------------------------------------------------------- */
static inline void vfsub_drop_nlink(struct inode *inode)
{
AuDebugOn(!inode->i_nlink);
drop_nlink(inode);
}
static inline void vfsub_dead_dir(struct inode *inode)
{
AuDebugOn(!S_ISDIR(inode->i_mode));
inode->i_flags |= S_DEAD;
clear_nlink(inode);
}
/* ---------------------------------------------------------------------- */
int vfsub_update_h_iattr(struct path *h_path, int *did);
struct file *vfsub_dentry_open(struct path *path, int flags);
struct file *vfsub_filp_open(const char *path, int oflags, int mode);
int vfsub_kern_path(const char *name, unsigned int flags, struct path *path);
struct dentry *vfsub_lookup_one_len(const char *name, struct dentry *parent,
int len);
struct dentry *vfsub_lookup_hash(struct nameidata *nd);
int vfsub_name_hash(const char *name, struct qstr *this, int len);
/* ---------------------------------------------------------------------- */
struct au_hinode;
struct dentry *vfsub_lock_rename(struct dentry *d1, struct au_hinode *hdir1,
struct dentry *d2, struct au_hinode *hdir2);
void vfsub_unlock_rename(struct dentry *d1, struct au_hinode *hdir1,
struct dentry *d2, struct au_hinode *hdir2);
int vfsub_create(struct inode *dir, struct path *path, int mode);
int vfsub_symlink(struct inode *dir, struct path *path,
const char *symname);
int vfsub_mknod(struct inode *dir, struct path *path, int mode, dev_t dev);
int vfsub_link(struct dentry *src_dentry, struct inode *dir,
struct path *path);
int vfsub_rename(struct inode *src_hdir, struct dentry *src_dentry,
struct inode *hdir, struct path *path);
int vfsub_mkdir(struct inode *dir, struct path *path, int mode);
int vfsub_rmdir(struct inode *dir, struct path *path);
/* ---------------------------------------------------------------------- */
ssize_t vfsub_read_u(struct file *file, char __user *ubuf, size_t count,
loff_t *ppos);
ssize_t vfsub_read_k(struct file *file, void *kbuf, size_t count,
loff_t *ppos);
ssize_t vfsub_write_u(struct file *file, const char __user *ubuf, size_t count,
loff_t *ppos);
ssize_t vfsub_write_k(struct file *file, void *kbuf, size_t count,
loff_t *ppos);
int vfsub_flush(struct file *file, fl_owner_t id);
int vfsub_readdir(struct file *file, filldir_t filldir, void *arg);
static inline unsigned int vfsub_file_flags(struct file *file)
{
unsigned int flags;
spin_lock(&file->f_lock);
flags = file->f_flags;
spin_unlock(&file->f_lock);
return flags;
}
static inline void vfsub_file_accessed(struct file *h_file)
{
file_accessed(h_file);
vfsub_update_h_iattr(&h_file->f_path, /*did*/NULL); /*ignore*/
}
static inline void vfsub_touch_atime(struct vfsmount *h_mnt,
struct dentry *h_dentry)
{
struct path h_path = {
.dentry = h_dentry,
.mnt = h_mnt
};
touch_atime(h_mnt, h_dentry);
vfsub_update_h_iattr(&h_path, /*did*/NULL); /*ignore*/
}
long vfsub_splice_to(struct file *in, loff_t *ppos,
struct pipe_inode_info *pipe, size_t len,
unsigned int flags);
long vfsub_splice_from(struct pipe_inode_info *pipe, struct file *out,
loff_t *ppos, size_t len, unsigned int flags);
int vfsub_trunc(struct path *h_path, loff_t length, unsigned int attr,
struct file *h_file);
int vfsub_fsync(struct file *file, struct path *path, int datasync);
/* ---------------------------------------------------------------------- */
static inline loff_t vfsub_llseek(struct file *file, loff_t offset, int origin)
{
loff_t err;
lockdep_off();
err = vfs_llseek(file, offset, origin);
lockdep_on();
return err;
}
/* ---------------------------------------------------------------------- */
/* dirty workaround for strict type of fmode_t */
union vfsub_fmu {
fmode_t fm;
unsigned int ui;
};
static inline unsigned int vfsub_fmode_to_uint(fmode_t fm)
{
union vfsub_fmu u = {
.fm = fm
};
BUILD_BUG_ON(sizeof(u.fm) != sizeof(u.ui));
return u.ui;
}
static inline fmode_t vfsub_uint_to_fmode(unsigned int ui)
{
union vfsub_fmu u = {
.ui = ui
};
return u.fm;
}
/* ---------------------------------------------------------------------- */
int vfsub_sio_mkdir(struct inode *dir, struct path *path, int mode);
int vfsub_sio_rmdir(struct inode *dir, struct path *path);
int vfsub_sio_notify_change(struct path *path, struct iattr *ia);
int vfsub_notify_change(struct path *path, struct iattr *ia);
int vfsub_unlink(struct inode *dir, struct path *path, int force);
#endif /* __KERNEL__ */
#endif /* __AUFS_VFSUB_H__ */
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