core/services/b2/src/docs.md

## Capabilities

Depending on its configuration and the backing system, this service can expose:

- [ ] create_dir
- [x] stat
- [x] read
- [x] write
- [x] delete
- [x] list
- [x] copy
- [ ] rename
- [x] presign

Inspect the effective capability set with [`opendal_core::Operator::info`] and
[`opendal_core::OperatorInfo::capability`] after building an operator.

## Configuration

Use [`crate::B2Config`] for serializable configuration and this builder's
methods for direct construction. The field and method documentation defines
accepted values, defaults, and environment interaction.

## Example

### Via Builder

```rust,no_run
use opendal_core::Operator;
use opendal_core::Result;
use opendal_service_b2::B2;

#[tokio::main]
async fn main() -> Result<()> {
    // create backend builder
    let mut builder = B2::default()
        // set the storage bucket for OpenDAL
        .root("/")
        // set the key_id for OpenDAL
        .application_key_id("xxxxxxxxxx")
        // set the key_id for OpenDAL
        .application_key("xxxxxxxxxx")
        // set the     bucket name for OpenDAL
        .bucket("opendal")
        // set the bucket_id for OpenDAL
        .bucket_id("xxxxxxxxxxxxx");

    let op: Operator = Operator::new(builder)?;

    Ok(())
}
```