btrfs: remove root argument from btrfs_unlink_inode()

The root argument passed to btrfs_unlink_inode() and its callee,
__btrfs_unlink_inode(), always matches the root of the given directory and
the given inode. So remove the argument and make __btrfs_unlink_inode()
use the root of the directory.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 11 insertions, 14 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 3032893efee5..5fec009fbe63 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -4056,11 +4056,11 @@ int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
  * also drops the back refs in the inode to the directory
  */
 static int __btrfs_unlink_inode(struct btrfs_trans_handle *trans,
-				struct btrfs_root *root,
 				struct btrfs_inode *dir,
 				struct btrfs_inode *inode,
 				const char *name, int name_len)
 {
+	struct btrfs_root *root = dir->root;
 	struct btrfs_fs_info *fs_info = root->fs_info;
 	struct btrfs_path *path;
 	int ret = 0;
@@ -4150,15 +4150,14 @@ out:
 }
 
 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
-		       struct btrfs_root *root,
 		       struct btrfs_inode *dir, struct btrfs_inode *inode,
 		       const char *name, int name_len)
 {
 	int ret;
-	ret = __btrfs_unlink_inode(trans, root, dir, inode, name, name_len);
+	ret = __btrfs_unlink_inode(trans, dir, inode, name, name_len);
 	if (!ret) {
 		drop_nlink(&inode->vfs_inode);
-		ret = btrfs_update_inode(trans, root, inode);
+		ret = btrfs_update_inode(trans, inode->root, inode);
 	}
 	return ret;
 }
@@ -4187,7 +4186,6 @@ static struct btrfs_trans_handle *__unlink_start_trans(struct inode *dir)
 
 static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
 {
-	struct btrfs_root *root = BTRFS_I(dir)->root;
 	struct btrfs_trans_handle *trans;
 	struct inode *inode = d_inode(dentry);
 	int ret;
@@ -4199,7 +4197,7 @@ static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
 	btrfs_record_unlink_dir(trans, BTRFS_I(dir), BTRFS_I(d_inode(dentry)),
 			0);
 
-	ret = btrfs_unlink_inode(trans, root, BTRFS_I(dir),
+	ret = btrfs_unlink_inode(trans, BTRFS_I(dir),
 			BTRFS_I(d_inode(dentry)), dentry->d_name.name,
 			dentry->d_name.len);
 	if (ret)
@@ -4213,7 +4211,7 @@ static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
 
 out:
 	btrfs_end_transaction(trans);
-	btrfs_btree_balance_dirty(root->fs_info);
+	btrfs_btree_balance_dirty(BTRFS_I(dir)->root->fs_info);
 	return ret;
 }
 
@@ -4564,7 +4562,6 @@ static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
 {
 	struct inode *inode = d_inode(dentry);
 	int err = 0;
-	struct btrfs_root *root = BTRFS_I(dir)->root;
 	struct btrfs_trans_handle *trans;
 	u64 last_unlink_trans;
 
@@ -4589,7 +4586,7 @@ static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
 	last_unlink_trans = BTRFS_I(inode)->last_unlink_trans;
 
 	/* now the directory is empty */
-	err = btrfs_unlink_inode(trans, root, BTRFS_I(dir),
+	err = btrfs_unlink_inode(trans, BTRFS_I(dir),
 			BTRFS_I(d_inode(dentry)), dentry->d_name.name,
 			dentry->d_name.len);
 	if (!err) {
@@ -4610,7 +4607,7 @@ static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
 	}
 out:
 	btrfs_end_transaction(trans);
-	btrfs_btree_balance_dirty(root->fs_info);
+	btrfs_btree_balance_dirty(BTRFS_I(dir)->root->fs_info);
 
 	return err;
 }
@@ -9468,7 +9465,7 @@ static int btrfs_rename_exchange(struct inode *old_dir,
 	if (old_ino == BTRFS_FIRST_FREE_OBJECTID) {
 		ret = btrfs_unlink_subvol(trans, old_dir, old_dentry);
 	} else { /* src is an inode */
-		ret = __btrfs_unlink_inode(trans, root, BTRFS_I(old_dir),
+		ret = __btrfs_unlink_inode(trans, BTRFS_I(old_dir),
 					   BTRFS_I(old_dentry->d_inode),
 					   old_dentry->d_name.name,
 					   old_dentry->d_name.len);
@@ -9484,7 +9481,7 @@ static int btrfs_rename_exchange(struct inode *old_dir,
 	if (new_ino == BTRFS_FIRST_FREE_OBJECTID) {
 		ret = btrfs_unlink_subvol(trans, new_dir, new_dentry);
 	} else { /* dest is an inode */
-		ret = __btrfs_unlink_inode(trans, dest, BTRFS_I(new_dir),
+		ret = __btrfs_unlink_inode(trans, BTRFS_I(new_dir),
 					   BTRFS_I(new_dentry->d_inode),
 					   new_dentry->d_name.name,
 					   new_dentry->d_name.len);
@@ -9759,7 +9756,7 @@ static int btrfs_rename(struct user_namespace *mnt_userns,
 		 */
 		btrfs_pin_log_trans(root);
 		log_pinned = true;
-		ret = __btrfs_unlink_inode(trans, root, BTRFS_I(old_dir),
+		ret = __btrfs_unlink_inode(trans, BTRFS_I(old_dir),
 					BTRFS_I(d_inode(old_dentry)),
 					old_dentry->d_name.name,
 					old_dentry->d_name.len);
@@ -9779,7 +9776,7 @@ static int btrfs_rename(struct user_namespace *mnt_userns,
 			ret = btrfs_unlink_subvol(trans, new_dir, new_dentry);
 			BUG_ON(new_inode->i_nlink == 0);
 		} else {
-			ret = btrfs_unlink_inode(trans, dest, BTRFS_I(new_dir),
+			ret = btrfs_unlink_inode(trans, BTRFS_I(new_dir),
 						 BTRFS_I(d_inode(new_dentry)),
 						 new_dentry->d_name.name,
 						 new_dentry->d_name.len);