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;
18 const char *redirect_mode;
25 struct super_block *sb;
32 /* Index of this layer in fs root (upper idx == 0) */
34 /* One fsid per unique underlying sb (upper fsid == 0) */
39 struct ovl_layer *layer;
40 struct dentry *dentry;
43 /* private information held for overlayfs's superblock */
45 struct vfsmount *upper_mnt;
46 unsigned int numlower;
47 /* Number of unique lower sb that differ from upper sb */
48 unsigned int numlowerfs;
49 struct ovl_layer *lower_layers;
50 struct ovl_sb *lower_fs;
51 /* workbasedir is the path at workdir= mount option */
52 struct dentry *workbasedir;
53 /* workdir is the 'work' directory under workbasedir */
54 struct dentry *workdir;
55 /* index directory listing overlay inodes by origin file handle */
56 struct dentry *indexdir;
58 /* pathnames of lower and upper dirs, for show_options */
59 struct ovl_config config;
60 /* creds of process who forced instantiation of super block */
61 const struct cred *creator_cred;
64 /* Did we take the inuse lock? */
67 /* Inode numbers in all layers do not use the high xino_bits */
68 unsigned int xino_bits;
71 /* private information held for every overlayfs dentry */
80 struct ovl_path lowerstack[];
83 struct ovl_entry *ovl_alloc_entry(unsigned int numlower);
85 static inline struct ovl_entry *OVL_E(struct dentry *dentry)
87 return (struct ovl_entry *) dentry->d_fsdata;
91 struct ovl_dir_cache *cache;
95 struct inode vfs_inode;
96 struct dentry *__upperdentry;
99 /* synchronize copy up and more */
103 static inline struct ovl_inode *OVL_I(struct inode *inode)
105 return container_of(inode, struct ovl_inode, vfs_inode);
108 static inline struct dentry *ovl_upperdentry_dereference(struct ovl_inode *oi)
110 return READ_ONCE(oi->__upperdentry);