The physical size of a fixed VHD is the data region plus the 512
byte footer. Verify it differs from the logical size.
Assisted-by: Claude:Opus-4.6
Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
Fixed VHDs do not support resize. Verify the error is returned.
Assisted-by: Claude:Opus-4.6
Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
Verify that a cloned disk produces the same async I/O backend
as the original for both sync and io_uring paths.
Assisted-by: Claude:Opus-4.6
Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
Verify that create_async_io dispatches to the correct backend
depending on use_io_uring. The sync backend does not support
batch requests, while the io_uring backend does.
Assisted-by: Claude:Opus-4.6
Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
Verify that FixedVhdDisk::new with the sync backend reads the VHD
footer and reports the correct logical size.
Assisted-by: Claude:Opus-4.6
Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
Introduce FixedVhdDisk as a single DiskFile wrapper around FixedVhd.
It accepts a use_io_uring flag at construction time and dispatches to
FixedVhdSync or FixedVhdAsync inside create_async_io() accordingly.
Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
