scsi: scsi_debug: Do not write a partial physical block to a zoned device

do_device_access() copies one logical block at a time and stops at the
first short copy, so a data-out buffer smaller than the transfer length of
the command can leave part of a physical block written. An initiator can
arrange that with SG_IO.

That is acceptable everywhere but a sequential write required zone, where
ZBC-3 r06 (T10/BSR INCITS 579), 4.5.3.3.2, requires a write to end on a
physical block boundary.

For such a zone, stop at the last whole physical block that the buffer
holds. The bytes left over are not written, and are reported to the
initiator as part of the residual.

Assisted-by: LLM
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Niklas Cassel <cassel@kernel.org>
Link: https://patch.msgid.link/20260929082456.857423-24-cassel@kernel.org
Signed-off-by: Martin K. Petersen (Oracle) <mkp@kernel.org>

0 files changed, 0 insertions, 0 deletions