Expand description
§VirtIO Block Device Driver
This module provides a driver for VirtIO block devices, implementing the BlockDevice trait for integration with the kernel’s block device subsystem.
The driver supports basic block operations (read/write) and handles the VirtIO queue management for block device requests.
§Features Support
The driver checks for and handles the following VirtIO block device features:
VIRTIO_BLK_F_BLK_SIZE: Custom sector sizeVIRTIO_BLK_F_RO: Read-only device detection
§Implementation Details
The driver uses a single virtqueue for processing block I/O requests. Each request consists of three parts:
- Request header (specifying operation type and sector)
- Data buffer (for read/write content)
- Status byte (for operation result)
Requests are processed through the VirtIO descriptor chain mechanism, with proper memory management using Box allocations to ensure data remains valid during transfers.