On 22/08/2025 09:02, Ojaswin Mujoo wrote:
From: "Ritesh Harjani (IBM)" <ritesh.list@xxxxxxxxx> This test does a lot of parallel RWF_ATOMIC IO on a preallocated file to stress the write and end-io unwritten conversion code paths. We brute force this for different blocksize and clustersizes and after each iteration we ensure the data was not torn or corrupted using fio crc verification. Note that in this test we use overlapping atomic writes of same io size. Although serializing racing writes is not guaranteed for RWF_ATOMIC, NVMe and SCSI provide this guarantee as an inseparable feature to power-fail atomicity. Keeping the iosize as same also ensures that ext4 doesn't tear the write due to racing ioend unwritten conversion. The value of this test is that we make sure the RWF_ATOMIC is handled correctly by ext4 as well as test that the block layer doesn't split or only generate multiple bios for an atomic write. Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@xxxxxxxxx> Signed-off-by: Ojaswin Mujoo <ojaswin@xxxxxxxxxxxxx>
Reviewed-by: John Garry <john.g.garry@xxxxxxxxxx>
