ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/fs/overlayfs/ovl_entry.h b/marvell/linux/fs/overlayfs/ovl_entry.h
new file mode 100644
index 0000000..304f95f
--- /dev/null
+++ b/marvell/linux/fs/overlayfs/ovl_entry.h
@@ -0,0 +1,148 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ *
+ * Copyright (C) 2011 Novell Inc.
+ * Copyright (C) 2016 Red Hat, Inc.
+ */
+
+enum {
+ OVL_FSYNC_STRICT,
+ OVL_FSYNC_ORDERED,
+ OVL_FSYNC_VOLATILE,
+};
+
+struct ovl_config {
+ char *lowerdir;
+ char *upperdir;
+ char *workdir;
+ bool default_permissions;
+ bool redirect_dir;
+ bool redirect_follow;
+ const char *redirect_mode;
+ bool index;
+ bool nfs_export;
+ int xino;
+ bool metacopy;
+ bool override_creds;
+ int fsync_mode;
+};
+
+struct ovl_sb {
+ struct super_block *sb;
+ dev_t pseudo_dev;
+ /* Unusable (conflicting) uuid */
+ bool bad_uuid;
+};
+
+struct ovl_layer {
+ /* ovl_free_fs() relies on @mnt being the first member! */
+ struct vfsmount *mnt;
+ /* Trap in ovl inode cache */
+ struct inode *trap;
+ struct ovl_sb *fs;
+ /* Index of this layer in fs root (upper idx == 0) */
+ int idx;
+ /* One fsid per unique underlying sb (upper fsid == 0) */
+ int fsid;
+};
+
+/*
+ * ovl_free_fs() relies on @mnt being the first member when unmounting
+ * the private mounts created for each layer. Let's check both the
+ * offset and type.
+ */
+static_assert(offsetof(struct ovl_layer, mnt) == 0);
+static_assert(__same_type(typeof_member(struct ovl_layer, mnt), struct vfsmount *));
+
+struct ovl_path {
+ struct ovl_layer *layer;
+ struct dentry *dentry;
+};
+
+/* private information held for overlayfs's superblock */
+struct ovl_fs {
+ struct vfsmount *upper_mnt;
+ unsigned int numlower;
+ /* Number of unique lower sb that differ from upper sb */
+ unsigned int numlowerfs;
+ struct ovl_layer *lower_layers;
+ struct ovl_sb *lower_fs;
+ /* workbasedir is the path at workdir= mount option */
+ struct dentry *workbasedir;
+ /* workdir is the 'work' directory under workbasedir */
+ struct dentry *workdir;
+ /* index directory listing overlay inodes by origin file handle */
+ struct dentry *indexdir;
+ 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;
+ bool tmpfile;
+ bool noxattr;
+ /* Did we take the inuse lock? */
+ bool upperdir_locked;
+ bool workdir_locked;
+ /* Traps in ovl inode cache */
+ struct inode *upperdir_trap;
+ struct inode *workbasedir_trap;
+ struct inode *workdir_trap;
+ struct inode *indexdir_trap;
+ /* Inode numbers in all layers do not use the high xino_bits */
+ unsigned int xino_bits;
+};
+
+/* private information held for every overlayfs dentry */
+struct ovl_entry {
+ union {
+ struct {
+ unsigned long flags;
+ };
+ struct rcu_head rcu;
+ };
+ unsigned numlower;
+ struct ovl_path lowerstack[];
+};
+
+struct ovl_entry *ovl_alloc_entry(unsigned int numlower);
+
+static inline struct ovl_entry *OVL_E(struct dentry *dentry)
+{
+ return (struct ovl_entry *) dentry->d_fsdata;
+}
+
+static inline bool ovl_should_sync(struct ovl_fs *ofs)
+{
+ return ofs->config.fsync_mode != OVL_FSYNC_VOLATILE;
+}
+
+static inline bool ovl_should_sync_strict(struct ovl_fs *ofs)
+{
+ return ofs->config.fsync_mode == OVL_FSYNC_STRICT;
+}
+
+struct ovl_inode {
+ union {
+ struct ovl_dir_cache *cache; /* directory */
+ struct inode *lowerdata; /* regular file */
+ };
+ const char *redirect;
+ u64 version;
+ unsigned long flags;
+ struct inode vfs_inode;
+ struct dentry *__upperdentry;
+ struct inode *lower;
+
+ /* synchronize copy up and more */
+ struct mutex lock;
+};
+
+static inline struct ovl_inode *OVL_I(struct inode *inode)
+{
+ return container_of(inode, struct ovl_inode, vfs_inode);
+}
+
+static inline struct dentry *ovl_upperdentry_dereference(struct ovl_inode *oi)
+{
+ return READ_ONCE(oi->__upperdentry);
+}