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fix(blk): add file lock to disk image

Introduce file locking for the virtio block device's disk image to
prevent multiple processes or VMs from accessing the same disk image
concurrently, which could lead to data corruption.

A shared lock is used for read-only access, and an exclusive lock for
read-write access.

Signed-off-by: Changyuan Lyu <changyuanl@google.com>

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