btrfs: Remove root arg from btrfs_log_inode_parent

btrfs_log_inode_parent is called from 2 places (btrfs_log_dentry_safe
and btrfs_log_new_name) both of which pass inode->root as the root
argument and the inode itself. Remove the redundant root argument and
get a reference to the root directly from the inode, also remove
redundant root != inode->root check from the same function. No
functional change.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/tree-log.c

@@ -5513,7 +5513,6 @@ out:
  * the last committed transaction
  */
 static int btrfs_log_inode_parent(struct btrfs_trans_handle *trans,
-				  struct btrfs_root *root,
 				  struct btrfs_inode *inode,
 				  struct dentry *parent,
 				  const loff_t start,
@@ -5521,6 +5520,7 @@ static int btrfs_log_inode_parent(struct btrfs_trans_handle *trans,
 				  int inode_only,
 				  struct btrfs_log_ctx *ctx)
 {
+	struct btrfs_root *root = inode->root;
 	struct btrfs_fs_info *fs_info = root->fs_info;
 	struct super_block *sb;
 	struct dentry *old_parent = NULL;
@@ -5546,7 +5546,7 @@ static int btrfs_log_inode_parent(struct btrfs_trans_handle *trans,
 		goto end_no_trans;
 	}
 
-	if (root != inode->root || btrfs_root_refs(&root->root_item) == 0) {
+	if (btrfs_root_refs(&root->root_item) == 0) {
 		ret = 1;
 		goto end_no_trans;
 	}
@@ -5686,8 +5686,8 @@ int btrfs_log_dentry_safe(struct btrfs_trans_handle *trans,
 	struct dentry *parent = dget_parent(dentry);
 	int ret;
 
-	ret = btrfs_log_inode_parent(trans, root, BTRFS_I(d_inode(dentry)),
-			parent, start, end, LOG_INODE_ALL, ctx);
+	ret = btrfs_log_inode_parent(trans, BTRFS_I(d_inode(dentry)), parent,
+				     start, end, LOG_INODE_ALL, ctx);
 	dput(parent);
 
 	return ret;
@@ -5949,7 +5949,6 @@ int btrfs_log_new_name(struct btrfs_trans_handle *trans,
 			struct dentry *parent)
 {
 	struct btrfs_fs_info *fs_info = btrfs_sb(inode->vfs_inode.i_sb);
-	struct btrfs_root *root = inode->root;
 
 	/*
 	 * this will force the logging code to walk the dentry chain
@@ -5966,7 +5965,7 @@ int btrfs_log_new_name(struct btrfs_trans_handle *trans,
 	    (!old_dir || old_dir->logged_trans <= fs_info->last_trans_committed))
 		return 0;
 
-	return btrfs_log_inode_parent(trans, root, inode, parent, 0,
-				      LLONG_MAX, LOG_INODE_EXISTS, NULL);
+	return btrfs_log_inode_parent(trans, inode, parent, 0, LLONG_MAX,
+				      LOG_INODE_EXISTS, NULL);
 }