This is a note to let you know that I've just added the patch titled
scsi: scsi_debug: Make the READ CAPACITY response compliant with ZBC
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
scsi-scsi_debug-make-the-read-capacity-response-comp.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit f9429c34812c2147f2b6309f2b19c1fecc6780f3
Author: Bart Van Assche <bvanassche@xxxxxxx>
Date: Wed Nov 2 12:32:48 2022 -0700
scsi: scsi_debug: Make the READ CAPACITY response compliant with ZBC
[ Upstream commit ecb8c2580d37dbb641451049376d80c8afaa387f ]
From ZBC-1:
- RC BASIS = 0: The RETURNED LOGICAL BLOCK ADDRESS field indicates the
highest LBA of a contiguous range of zones that are not sequential write
required zones starting with the first zone.
- RC BASIS = 1: The RETURNED LOGICAL BLOCK ADDRESS field indicates the LBA
of the last logical block on the logical unit.
The current scsi_debug READ CAPACITY response does not comply with the
above if there are one or more sequential write required zones. SCSI
initiators need a way to retrieve the largest valid LBA from SCSI
devices. Reporting the largest valid LBA if there are one or more
sequential zones requires to set the RC BASIS field in the READ CAPACITY
response to one. Hence this patch.
Cc: Douglas Gilbert <dgilbert@xxxxxxxxxxxx>
Cc: Damien Le Moal <damien.lemoal@xxxxxxxxxxxxxxxxxx>
Suggested-by: Damien Le Moal <damien.lemoal@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx>
Link: https://lore.kernel.org/r/20221102193248.3177608-1-bvanassche@xxxxxxx
Reviewed-by: Damien Le Moal <damien.lemoal@xxxxxxxxxxxxxxxxxx>
Acked-by: Douglas Gilbert <dgilbert@xxxxxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 261b915835b4..cc20621bb49d 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -1878,6 +1878,13 @@ static int resp_readcap16(struct scsi_cmnd *scp,
arr[14] |= 0x40;
}
+ /*
+ * Since the scsi_debug READ CAPACITY implementation always reports the
+ * total disk capacity, set RC BASIS = 1 for host-managed ZBC devices.
+ */
+ if (devip->zmodel == BLK_ZONED_HM)
+ arr[12] |= 1 << 4;
+
arr[15] = sdebug_lowest_aligned & 0xff;
if (have_dif_prot) {
