btrfs: remove err variable from btrfs_delete_subvolume

Use only a single 'ret' to control whether we should abort the
transaction or not. That's fine, because if we abort a transaction then
btrfs_end_transaction will return the same value as passed to
btrfs_abort_transaction. No semantic changes.

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

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index dda1810..347076f 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -4107,7 +4107,6 @@ int btrfs_delete_subvolume(struct inode *dir, struct dentry *dentry)
        struct btrfs_block_rsv block_rsv;
        u64 root_flags;
        int ret;
-       int err;
 
        /*
         * Don't allow to delete a subvolume with send in progress. This is
@@ -4129,8 +4128,8 @@ int btrfs_delete_subvolume(struct inode *dir, struct dentry *dentry)
 
        down_write(&fs_info->subvol_sem);
 
-       err = may_destroy_subvol(dest);
-       if (err)
+       ret = may_destroy_subvol(dest);
+       if (ret)
                goto out_up_write;
 
        btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
@@ -4139,13 +4138,13 @@ int btrfs_delete_subvolume(struct inode *dir, struct dentry *dentry)
         * two for dir entries,
         * two for root ref/backref.
         */
-       err = btrfs_subvolume_reserve_metadata(root, &block_rsv, 5, true);
-       if (err)
+       ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 5, true);
+       if (ret)
                goto out_up_write;
 
        trans = btrfs_start_transaction(root, 0);
        if (IS_ERR(trans)) {
-               err = PTR_ERR(trans);
+               ret = PTR_ERR(trans);
                goto out_release;
        }
        trans->block_rsv = &block_rsv;
@@ -4155,7 +4154,6 @@ int btrfs_delete_subvolume(struct inode *dir, struct dentry *dentry)
 
        ret = btrfs_unlink_subvol(trans, dir, dentry);
        if (ret) {
-               err = ret;
                btrfs_abort_transaction(trans, ret);
                goto out_end_trans;
        }
@@ -4173,7 +4171,6 @@ int btrfs_delete_subvolume(struct inode *dir, struct dentry *dentry)
                                        dest->root_key.objectid);
                if (ret) {
                        btrfs_abort_transaction(trans, ret);
-                       err = ret;
                        goto out_end_trans;
                }
        }
@@ -4183,7 +4180,6 @@ int btrfs_delete_subvolume(struct inode *dir, struct dentry *dentry)
                                  dest->root_key.objectid);
        if (ret && ret != -ENOENT) {
                btrfs_abort_transaction(trans, ret);
-               err = ret;
                goto out_end_trans;
        }
        if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) {
@@ -4193,7 +4189,6 @@ int btrfs_delete_subvolume(struct inode *dir, struct dentry *dentry)
                                          dest->root_key.objectid);
                if (ret && ret != -ENOENT) {
                        btrfs_abort_transaction(trans, ret);
-                       err = ret;
                        goto out_end_trans;
                }
        }
@@ -4204,14 +4199,12 @@ out_end_trans:
        trans->block_rsv = NULL;
        trans->bytes_reserved = 0;
        ret = btrfs_end_transaction(trans);
-       if (ret && !err)
-               err = ret;
        inode->i_flags |= S_DEAD;
 out_release:
        btrfs_subvolume_release_metadata(root, &block_rsv);
 out_up_write:
        up_write(&fs_info->subvol_sem);
-       if (err) {
+       if (ret) {
                spin_lock(&dest->root_item_lock);
                root_flags = btrfs_root_flags(&dest->root_item);
                btrfs_set_root_flags(&dest->root_item,
@@ -4229,7 +4222,7 @@ out_up_write:
                }
        }
 
-       return err;
+       return ret;
 }
 
 static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)