/* * * Copyright (C) 2011 Novell Inc. * Copyright (C) 2016 Red Hat, Inc. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published by * the Free Software Foundation. */ struct ovl_config { char *lowerdir; char *upperdir; char *workdir; bool default_permissions; bool redirect_dir; }; /* private information held for overlayfs's superblock */ struct ovl_fs { struct vfsmount *upper_mnt; unsigned numlower; struct vfsmount **lower_mnt; struct dentry *workdir; long namelen; /* pathnames of lower and upper dirs, for show_options */ struct ovl_config config; /* creds of process who forced instantiation of super block */ const struct cred *creator_cred; }; /* private information held for every overlayfs dentry */ struct ovl_entry { struct dentry *__upperdentry; struct ovl_dir_cache *cache; union { struct { u64 version; const char *redirect; bool opaque; }; struct rcu_head rcu; }; unsigned numlower; struct path lowerstack[]; }; struct ovl_entry *ovl_alloc_entry(unsigned int numlower); static inline struct dentry *ovl_upperdentry_dereference(struct ovl_entry *oe) { return lockless_dereference(oe->__upperdentry); } back
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