1 /* SPDX-License-Identifier: GPL-2.0-only */
4 * Copyright (C) 2011 Novell Inc.
5 * Copyright (C) 2016 Red Hat, Inc.
12 bool default_permissions;
15 const char *redirect_mode;
23 struct super_block *sb;
29 /* Trap in ovl inode cache */
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 /* Traps in ovl inode cache */
68 struct inode *upperdir_trap;
69 struct inode *workbasedir_trap;
70 struct inode *workdir_trap;
71 struct inode *indexdir_trap;
72 /* Inode numbers in all layers do not use the high xino_bits */
73 unsigned int xino_bits;
76 /* private information held for every overlayfs dentry */
85 struct ovl_path lowerstack[];
88 struct ovl_entry *ovl_alloc_entry(unsigned int numlower);
90 static inline struct ovl_entry *OVL_E(struct dentry *dentry)
92 return (struct ovl_entry *) dentry->d_fsdata;
97 struct ovl_dir_cache *cache; /* directory */
98 struct inode *lowerdata; /* regular file */
100 const char *redirect;
103 struct inode vfs_inode;
104 struct dentry *__upperdentry;
107 /* synchronize copy up and more */
111 static inline struct ovl_inode *OVL_I(struct inode *inode)
113 return container_of(inode, struct ovl_inode, vfs_inode);
116 static inline struct dentry *ovl_upperdentry_dereference(struct ovl_inode *oi)
118 return READ_ONCE(oi->__upperdentry);