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FLUSH commands don't have meaningful offset and bytes parameters, so using SyncFileRange with these values is incorrect. Replace with Fsync in the zero-copy path to match the behavior of the non-zero-copy path. Fixes: 3e5a7c5 ("rublk: loop: support zero copy") Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Add zero-copy parameter to __test_ublk_add_del_loop() and create new test_ublk_format_mount_loop_zero_copy() test that verifies zero-copy loop devices work correctly with filesystem operations including mkfs.ext4, mount, I/O, and umount. Signed-off-by: Ming Lei <tom.leiming@gmail.com>
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