fs: remove power of 2 and length boundary atomic write restrictions #428
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generic_atomic_write_valid() returns EINVAL for non-power-of-2 and for non-length-aligned writes. This check is used for block devices, ext4 and xfs, but neither ext4 nor xfs rely on power of 2 restrictions. For block devices, neither NVMe nor SCSI specification doesn't require length alignment and 2^N length. Both specifications only require to respect the atomic write boundary if it's set (NABSPF/NABO for NVMe and ATOMIC BOUNDARY for SCSI). NVMe subsystem already checks writes against this boundary; SCSI uses an explicit atomic write command so the write is checked by the drive itself. Signed-off-by: Vitaliy Filippov <vitalifster@gmail.com>
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Pull request for series with
subject: fs: remove power of 2 and length boundary atomic write restrictions
version: 1
url: https://patchwork.kernel.org/project/linux-block/list/?series=1036389