ovl: use inode instead of dentry where possible

Passing dentry to some helpers is unnecessary.  Simplify these cases.
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

fs/overlayfs/overlayfs.h

@@ -401,7 +401,7 @@ const char *ovl_dentry_get_redirect(struct dentry *dentry);
 void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect);
 void ovl_inode_update(struct inode *inode, struct dentry *upperdentry);
 void ovl_dir_modified(struct dentry *dentry, bool impurity);
-u64 ovl_dentry_version_get(struct dentry *dentry);
+u64 ovl_inode_version_get(struct inode *inode);
 bool ovl_is_whiteout(struct dentry *dentry);
 struct file *ovl_path_open(const struct path *path, int flags);
 int ovl_copy_up_start(struct dentry *dentry, int flags);
@@ -571,9 +571,9 @@ int ovl_indexdir_cleanup(struct ovl_fs *ofs);
  * lower dir was removed under it and possibly before it was rotated from upper
  * to lower layer.
  */
-static inline bool ovl_dir_is_real(struct dentry *dir)
+static inline bool ovl_dir_is_real(struct inode *dir)
 {
-	return !ovl_test_flag(OVL_WHITEOUTS, d_inode(dir));
+	return !ovl_test_flag(OVL_WHITEOUTS, dir);
 }
 
 /* inode.c */

fs/overlayfs/readdir.c

@@ -235,15 +235,15 @@ void ovl_dir_cache_free(struct inode *inode)
 	}
 }
 
-static void ovl_cache_put(struct ovl_dir_file *od, struct dentry *dentry)
+static void ovl_cache_put(struct ovl_dir_file *od, struct inode *inode)
 {
 	struct ovl_dir_cache *cache = od->cache;
 
 	WARN_ON(cache->refcount <= 0);
 	cache->refcount--;
 	if (!cache->refcount) {
-		if (ovl_dir_cache(d_inode(dentry)) == cache)
-			ovl_set_dir_cache(d_inode(dentry), NULL);
+		if (ovl_dir_cache(inode) == cache)
+			ovl_set_dir_cache(inode, NULL);
 
 		ovl_cache_free(&cache->entries);
 		kfree(cache);
@@ -323,15 +323,15 @@ static void ovl_dir_reset(struct file *file)
 {
 	struct ovl_dir_file *od = file->private_data;
 	struct ovl_dir_cache *cache = od->cache;
-	struct dentry *dentry = file->f_path.dentry;
+	struct inode *inode = file_inode(file);
 	bool is_real;
 
-	if (cache && ovl_dentry_version_get(dentry) != cache->version) {
-		ovl_cache_put(od, dentry);
+	if (cache && ovl_inode_version_get(inode) != cache->version) {
+		ovl_cache_put(od, inode);
 		od->cache = NULL;
 		od->cursor = NULL;
 	}
-	is_real = ovl_dir_is_real(dentry);
+	is_real = ovl_dir_is_real(inode);
 	if (od->is_real != is_real) {
 		/* is_real can only become false when dir is copied up */
 		if (WARN_ON(is_real))
@@ -394,9 +394,10 @@ static struct ovl_dir_cache *ovl_cache_get(struct dentry *dentry)
 {
 	int res;
 	struct ovl_dir_cache *cache;
+	struct inode *inode = d_inode(dentry);
 
-	cache = ovl_dir_cache(d_inode(dentry));
-	if (cache && ovl_dentry_version_get(dentry) == cache->version) {
+	cache = ovl_dir_cache(inode);
+	if (cache && ovl_inode_version_get(inode) == cache->version) {
 		WARN_ON(!cache->refcount);
 		cache->refcount++;
 		return cache;
@@ -418,8 +419,8 @@ static struct ovl_dir_cache *ovl_cache_get(struct dentry *dentry)
 		return ERR_PTR(res);
 	}
 
-	cache->version = ovl_dentry_version_get(dentry);
-	ovl_set_dir_cache(d_inode(dentry), cache);
+	cache->version = ovl_inode_version_get(inode);
+	ovl_set_dir_cache(inode, cache);
 
 	return cache;
 }
@@ -596,16 +597,17 @@ static struct ovl_dir_cache *ovl_cache_get_impure(const struct path *path)
 {
 	int res;
 	struct dentry *dentry = path->dentry;
+	struct inode *inode = d_inode(dentry);
 	struct ovl_fs *ofs = OVL_FS(dentry->d_sb);
 	struct ovl_dir_cache *cache;
 
-	cache = ovl_dir_cache(d_inode(dentry));
-	if (cache && ovl_dentry_version_get(dentry) == cache->version)
+	cache = ovl_dir_cache(inode);
+	if (cache && ovl_inode_version_get(inode) == cache->version)
 		return cache;
 
 	/* Impure cache is not refcounted, free it here */
-	ovl_dir_cache_free(d_inode(dentry));
-	ovl_set_dir_cache(d_inode(dentry), NULL);
+	ovl_dir_cache_free(inode);
+	ovl_set_dir_cache(inode, NULL);
 
 	cache = kzalloc(sizeof(struct ovl_dir_cache), GFP_KERNEL);
 	if (!cache)
@@ -627,13 +629,13 @@ static struct ovl_dir_cache *ovl_cache_get_impure(const struct path *path)
 					OVL_XATTR_IMPURE);
 			ovl_drop_write(dentry);
 		}
-		ovl_clear_flag(OVL_IMPURE, d_inode(dentry));
+		ovl_clear_flag(OVL_IMPURE, inode);
 		kfree(cache);
 		return NULL;
 	}
 
-	cache->version = ovl_dentry_version_get(dentry);
-	ovl_set_dir_cache(d_inode(dentry), cache);
+	cache->version = ovl_inode_version_get(inode);
+	ovl_set_dir_cache(inode, cache);
 
 	return cache;
 }
@@ -675,7 +677,7 @@ static bool ovl_fill_real(struct dir_context *ctx, const char *name,
 static bool ovl_is_impure_dir(struct file *file)
 {
 	struct ovl_dir_file *od = file->private_data;
-	struct inode *dir = d_inode(file->f_path.dentry);
+	struct inode *dir = file_inode(file);
 
 	/*
 	 * Only upper dir can be impure, but if we are in the middle of
@@ -893,7 +895,7 @@ static int ovl_dir_fsync(struct file *file, loff_t start, loff_t end,
 	struct file *realfile;
 	int err;
 
-	err = ovl_sync_status(OVL_FS(file->f_path.dentry->d_sb));
+	err = ovl_sync_status(OVL_FS(file_inode(file)->i_sb));
 	if (err <= 0)
 		return err;
 
@@ -913,7 +915,7 @@ static int ovl_dir_release(struct inode *inode, struct file *file)
 
 	if (od->cache) {
 		inode_lock(inode);
-		ovl_cache_put(od, file->f_path.dentry);
+		ovl_cache_put(od, inode);
 		inode_unlock(inode);
 	}
 	fput(od->realfile);
@@ -942,7 +944,7 @@ static int ovl_dir_open(struct inode *inode, struct file *file)
 		return PTR_ERR(realfile);
 	}
 	od->realfile = realfile;
-	od->is_real = ovl_dir_is_real(file->f_path.dentry);
+	od->is_real = ovl_dir_is_real(inode);
 	od->is_upper = OVL_TYPE_UPPER(type);
 	file->private_data = od;
 

fs/overlayfs/util.c

@@ -463,7 +463,7 @@ static void ovl_dir_version_inc(struct dentry *dentry, bool impurity)
 	 * which have been copied up and have origins), so only need to note
 	 * changes to impure entries.
 	 */
-	if (!ovl_dir_is_real(dentry) || impurity)
+	if (!ovl_dir_is_real(inode) || impurity)
 		OVL_I(inode)->version++;
 }
 
@@ -475,10 +475,8 @@ void ovl_dir_modified(struct dentry *dentry, bool impurity)
 	ovl_dir_version_inc(dentry, impurity);
 }
 
-u64 ovl_dentry_version_get(struct dentry *dentry)
+u64 ovl_inode_version_get(struct inode *inode)
 {
-	struct inode *inode = d_inode(dentry);
-
 	WARN_ON(!inode_is_locked(inode));
 	return OVL_I(inode)->version;
 }