vfs: live vfsmounts never have NULL ->mnt_sb

[mirror_ubuntu-artful-kernel.git] / fs / internal.h

/* fs/ internal definitions
 *
 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program 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.
 */

#include <linux/lglock.h>

struct super_block;
struct file_system_type;
struct linux_binprm;
struct path;

/*
 * block_dev.c
 */
#ifdef CONFIG_BLOCK
extern void __init bdev_cache_init(void);

extern int __sync_blockdev(struct block_device *bdev, int wait);

#else
static inline void bdev_cache_init(void)
{
}

static inline int __sync_blockdev(struct block_device *bdev, int wait)
{
	return 0;
}
#endif

/*
 * char_dev.c
 */
extern void __init chrdev_init(void);

/*
 * namespace.c
 */
extern int copy_mount_options(const void __user *, unsigned long *);
extern int copy_mount_string(const void __user *, char **);

extern struct vfsmount *__lookup_mnt(struct vfsmount *, struct dentry *, int);
extern struct vfsmount *lookup_mnt(struct path *);
extern int finish_automount(struct vfsmount *, struct path *);

extern void mnt_make_longterm(struct vfsmount *);
extern void mnt_make_shortterm(struct vfsmount *);

extern void __init mnt_init(void);

DECLARE_BRLOCK(vfsmount_lock);


/*
 * fs_struct.c
 */
extern void chroot_fs_refs(struct path *, struct path *);

/*
 * file_table.c
 */
extern void file_sb_list_add(struct file *f, struct super_block *sb);
extern void file_sb_list_del(struct file *f);
extern void mark_files_ro(struct super_block *);
extern struct file *get_empty_filp(void);

/*
 * super.c
 */
extern int do_remount_sb(struct super_block *, int, void *, int);
extern bool grab_super_passive(struct super_block *sb);
extern struct dentry *mount_fs(struct file_system_type *,
			       int, const char *, void *);

/*
 * open.c
 */
struct nameidata;
extern struct file *nameidata_to_filp(struct nameidata *);
extern void release_open_intent(struct nameidata *);
struct open_flags {
	int open_flag;
	int mode;
	int acc_mode;
	int intent;
};
extern struct file *do_filp_open(int dfd, const char *pathname,
		const struct open_flags *op, int lookup_flags);
extern struct file *do_file_open_root(struct dentry *, struct vfsmount *,
		const char *, const struct open_flags *, int lookup_flags);

extern long do_handle_open(int mountdirfd,
			   struct file_handle __user *ufh, int open_flag);

/*
 * inode.c
 */
extern spinlock_t inode_sb_list_lock;

/*
 * fs-writeback.c
 */
extern void inode_wb_list_del(struct inode *inode);

extern int get_nr_dirty_inodes(void);
extern void evict_inodes(struct super_block *);
extern int invalidate_inodes(struct super_block *, bool);

/*
 * dcache.c
 */
extern struct dentry *__d_alloc(struct super_block *, const struct qstr *);