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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - fs/overlayfs/ovl_entry.h
3 * Copyright (C) 2011 Novell Inc.
4 * Copyright (C) 2016 Red Hat, Inc.
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published by
8 * the Free Software Foundation.
15 bool default_permissions
;
20 /* private information held for overlayfs's superblock */
22 struct vfsmount
*upper_mnt
;
24 struct vfsmount
**lower_mnt
;
25 /* workbasedir is the path at workdir= mount option */
26 struct dentry
*workbasedir
;
27 /* workdir is the 'work' directory under workbasedir */
28 struct dentry
*workdir
;
29 /* index directory listing overlay inodes by origin file handle */
30 struct dentry
*indexdir
;
32 /* pathnames of lower and upper dirs, for show_options */
33 struct ovl_config config
;
34 /* creds of process who forced instantiation of super block */
35 const struct cred
*creator_cred
;
38 /* sb common to all layers */
39 struct super_block
*same_sb
;
42 /* private information held for every overlayfs dentry */
46 unsigned long has_upper
;
52 struct path lowerstack
[];
55 struct ovl_entry
*ovl_alloc_entry(unsigned int numlower
);
58 struct ovl_dir_cache
*cache
;
62 struct inode vfs_inode
;
63 struct dentry
*__upperdentry
;
66 /* synchronize copy up and more */
70 static inline struct ovl_inode
*OVL_I(struct inode
*inode
)
72 return container_of(inode
, struct ovl_inode
, vfs_inode
);
75 static inline struct dentry
*ovl_upperdentry_dereference(struct ovl_inode
*oi
)
77 return lockless_dereference(oi
->__upperdentry
);