ovl: use OVL_E() and OVL_E_FLAGS() accessors

Instead of open coded instances, because we are about to split
the two apart.
Reviewed-by: Alexander Larsson <alexl@redhat.com>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

fs/overlayfs/export.c

@@ -341,7 +341,7 @@ static struct dentry *ovl_obtain_alias(struct super_block *sb,
 /* Get the upper or lower dentry in stack whose on layer @idx */
 static struct dentry *ovl_dentry_real_at(struct dentry *dentry, int idx)
 {
-	struct ovl_entry *oe = dentry->d_fsdata;
+	struct ovl_entry *oe = OVL_E(dentry);
 	int i;
 
 	if (!idx)

fs/overlayfs/namei.c

@@ -790,7 +790,7 @@ struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper,
  */
 int ovl_path_next(int idx, struct dentry *dentry, struct path *path)
 {
-	struct ovl_entry *oe = dentry->d_fsdata;
+	struct ovl_entry *oe = OVL_E(dentry);
 
 	BUG_ON(idx < 0);
 	if (idx == 0) {
@@ -833,8 +833,8 @@ struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
 	struct ovl_entry *oe;
 	const struct cred *old_cred;
 	struct ovl_fs *ofs = dentry->d_sb->s_fs_info;
-	struct ovl_entry *poe = dentry->d_parent->d_fsdata;
-	struct ovl_entry *roe = dentry->d_sb->s_root->d_fsdata;
+	struct ovl_entry *poe = OVL_E(dentry->d_parent);
+	struct ovl_entry *roe = OVL_E(dentry->d_sb->s_root);
 	struct ovl_path *stack = NULL, *origin_path = NULL;
 	struct dentry *upperdir, *upperdentry = NULL;
 	struct dentry *origin = NULL;
@@ -1157,7 +1157,7 @@ struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
 
 bool ovl_lower_positive(struct dentry *dentry)
 {
-	struct ovl_entry *poe = dentry->d_parent->d_fsdata;
+	struct ovl_entry *poe = OVL_E(dentry->d_parent);
 	const struct qstr *name = &dentry->d_name;
 	const struct cred *old_cred;
 	unsigned int i;

fs/overlayfs/ovl_entry.h

@@ -124,6 +124,11 @@ static inline struct ovl_entry *OVL_E(struct dentry *dentry)
 	return (struct ovl_entry *) dentry->d_fsdata;
 }
 
+static inline unsigned long *OVL_E_FLAGS(struct dentry *dentry)
+{
+	return &OVL_E(dentry)->flags;
+}
+
 struct ovl_inode {
 	union {
 		struct ovl_dir_cache *cache;	/* directory */

fs/overlayfs/super.c

@@ -138,7 +138,7 @@ static int ovl_revalidate_real(struct dentry *d, unsigned int flags, bool weak)
 static int ovl_dentry_revalidate_common(struct dentry *dentry,
 					unsigned int flags, bool weak)
 {
-	struct ovl_entry *oe = dentry->d_fsdata;
+	struct ovl_entry *oe = OVL_E(dentry);
 	struct inode *inode = d_inode_rcu(dentry);
 	struct dentry *upper;
 	unsigned int i;

fs/overlayfs/util.c

@@ -143,7 +143,7 @@ bool ovl_dentry_weird(struct dentry *dentry)
 
 enum ovl_path_type ovl_path_type(struct dentry *dentry)
 {
-	struct ovl_entry *oe = dentry->d_fsdata;
+	struct ovl_entry *oe = OVL_E(dentry);
 	enum ovl_path_type type = 0;
 
 	if (ovl_dentry_upper(dentry)) {
@@ -176,7 +176,7 @@ void ovl_path_upper(struct dentry *dentry, struct path *path)
 
 void ovl_path_lower(struct dentry *dentry, struct path *path)
 {
-	struct ovl_entry *oe = dentry->d_fsdata;
+	struct ovl_entry *oe = OVL_E(dentry);
 
 	if (oe->numlower) {
 		path->mnt = oe->lowerstack[0].layer->mnt;
@@ -188,7 +188,7 @@ void ovl_path_lower(struct dentry *dentry, struct path *path)
 
 void ovl_path_lowerdata(struct dentry *dentry, struct path *path)
 {
-	struct ovl_entry *oe = dentry->d_fsdata;
+	struct ovl_entry *oe = OVL_E(dentry);
 
 	if (oe->numlower) {
 		path->mnt = oe->lowerstack[oe->numlower - 1].layer->mnt;
@@ -231,14 +231,14 @@ struct dentry *ovl_dentry_upper(struct dentry *dentry)
 
 struct dentry *ovl_dentry_lower(struct dentry *dentry)
 {
-	struct ovl_entry *oe = dentry->d_fsdata;
+	struct ovl_entry *oe = OVL_E(dentry);
 
 	return oe->numlower ? oe->lowerstack[0].dentry : NULL;
 }
 
 const struct ovl_layer *ovl_layer_lower(struct dentry *dentry)
 {
-	struct ovl_entry *oe = dentry->d_fsdata;
+	struct ovl_entry *oe = OVL_E(dentry);
 
 	return oe->numlower ? oe->lowerstack[0].layer : NULL;
 }
@@ -251,7 +251,7 @@ const struct ovl_layer *ovl_layer_lower(struct dentry *dentry)
  */
 struct dentry *ovl_dentry_lowerdata(struct dentry *dentry)
 {
-	struct ovl_entry *oe = dentry->d_fsdata;
+	struct ovl_entry *oe = OVL_E(dentry);
 
 	return oe->numlower ? oe->lowerstack[oe->numlower - 1].dentry : NULL;
 }
@@ -331,17 +331,17 @@ void ovl_set_dir_cache(struct inode *inode, struct ovl_dir_cache *cache)
 
 void ovl_dentry_set_flag(unsigned long flag, struct dentry *dentry)
 {
-	set_bit(flag, &OVL_E(dentry)->flags);
+	set_bit(flag, OVL_E_FLAGS(dentry));
 }
 
 void ovl_dentry_clear_flag(unsigned long flag, struct dentry *dentry)
 {
-	clear_bit(flag, &OVL_E(dentry)->flags);
+	clear_bit(flag, OVL_E_FLAGS(dentry));
 }
 
 bool ovl_dentry_test_flag(unsigned long flag, struct dentry *dentry)
 {
-	return test_bit(flag, &OVL_E(dentry)->flags);
+	return test_bit(flag, OVL_E_FLAGS(dentry));
 }
 
 bool ovl_dentry_is_opaque(struct dentry *dentry)
@@ -1017,7 +1017,7 @@ int ovl_check_metacopy_xattr(struct ovl_fs *ofs, const struct path *path)
 
 bool ovl_is_metacopy_dentry(struct dentry *dentry)
 {
-	struct ovl_entry *oe = dentry->d_fsdata;
+	struct ovl_entry *oe = OVL_E(dentry);
 
 	if (!d_is_reg(dentry))
 		return false;