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00c05f4761
O_DIRECT requires buffer addresses to be aligned to the backend device's logical block size. The existing bounce buffer logic in execute_async() hardcodes SECTOR_SIZE (512) for the alignment check and bounce buffer allocation. This is insufficient for devices with a 4096-byte logical block size, where misaligned buffers cause -EINVAL from the host kernel. Add an alignment() method to the AsyncIo trait that returns the backend's logical block size, defaulting to SECTOR_SIZE. The three raw I/O backends (io_uring, AIO, synchronous) probe the device topology via DiskTopology::probe() at creation time and return the actual logical block size. All image format backends would simply use the default value of 512 bytes since their underlying are not block devices. execute_async() now queries disk_image.alignment() instead of using the hardcoded SECTOR_SIZE Fixes: #7720 Signed-off-by: Saravanan D <saravanand@crusoe.ai>