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;
26 struct super_block *sb;
33 /* Index of this layer in fs root (upper idx == 0) */
35 /* One fsid per unique underlying sb (upper fsid == 0) */
40 struct ovl_layer *layer;
41 struct dentry *dentry;
44 /* private information held for overlayfs's superblock */
46 struct vfsmount *upper_mnt;
47 unsigned int numlower;
48 /* Number of unique lower sb that differ from upper sb */
49 unsigned int numlowerfs;
50 struct ovl_layer *lower_layers;
51 struct ovl_sb *lower_fs;
52 /* workbasedir is the path at workdir= mount option */
53 struct dentry *workbasedir;
54 /* workdir is the 'work' directory under workbasedir */
55 struct dentry *workdir;
56 /* index directory listing overlay inodes by origin file handle */
57 struct dentry *indexdir;
59 /* pathnames of lower and upper dirs, for show_options */
60 struct ovl_config config;
61 /* creds of process who forced instantiation of super block */
62 const struct cred *creator_cred;
65 /* Did we take the inuse lock? */
68 /* Inode numbers in all layers do not use the high xino_bits */
69 unsigned int xino_bits;
72 /* private information held for every overlayfs dentry */
81 struct ovl_path lowerstack[];
84 struct ovl_entry *ovl_alloc_entry(unsigned int numlower);
86 static inline struct ovl_entry *OVL_E(struct dentry *dentry)
88 return (struct ovl_entry *) dentry->d_fsdata;
93 struct ovl_dir_cache *cache; /* directory */
94 struct inode *lowerdata; /* regular file */
99 struct inode vfs_inode;
100 struct dentry *__upperdentry;
103 /* synchronize copy up and more */
107 static inline struct ovl_inode *OVL_I(struct inode *inode)
109 return container_of(inode, struct ovl_inode, vfs_inode);
112 static inline struct dentry *ovl_upperdentry_dereference(struct ovl_inode *oi)
114 return READ_ONCE(oi->__upperdentry);