scsi: scsi_debug: Enforce physical block alignment of zoned writes

ZBC-3 r06 (T10/BSR INCITS 579), 4.5.3.3.2, requires a write to a sequential
write required zone to be terminated with ILLEGAL REQUEST / UNALIGNED WRITE
COMMAND both when it does not start at the write pointer and when it does
not end on a physical block boundary. That is why sd_zbc_read_zones() sets
the zone_write_granularity queue limit to the physical block size of a
host-managed device.

check_zbc_access_params() implements the first condition but not the
second. So with zbc=managed sector_size=512 physblk_exp=3, a write of a
single logical block at the write pointer is accepted and advances the
write pointer by one logical block, leaving it off the granularity that was
advertised: nothing can write at it any more, and the zone can only be used
again after being reset.

Check the ending LBA as well, with the same sense data, as the standard
gives both conditions the same. An entire medium write same command, which
the standard excludes, needs no special case: the preceding check already
terminates it with WRITE BOUNDARY VIOLATION. Sequential write preferred
zones are left alone, as writes to them need not be sequential, and with
the default physblk_exp=0 the check is a no-op.

Assisted-by: LLM
Fixes: f0d1cf9378bd ("scsi: scsi_debug: Add ZBC zone commands")
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Niklas Cassel <cassel@kernel.org>
Link: https://patch.msgid.link/20260929082456.857423-23-cassel@kernel.org
Signed-off-by: Martin K. Petersen (Oracle) <mkp@kernel.org>

0 files changed, 0 insertions, 0 deletions