[PATCH v5 7/9] scsi: sd: fail read commands to offline zones early

[Damien Le Moal <dlemoal@kernel.org>]

Issuing read commands to offline zones of a ZBC disk will result in
failures. So do not issue such command and fail then early in
sd_setup_read_write_cmnd(). This change also checks write commands, which
is fine but should actually never happen as the block layer zone write
plugging code already fails write BIOs to offline zones early in the
submission path.

Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
---
 drivers/scsi/sd.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index a1b21ea14e54..db7c19d1c2ff 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1424,7 +1424,8 @@ static blk_status_t sd_setup_read_write_cmnd(struct scsi_cmnd *cmd)
 {
 	struct request *rq = scsi_cmd_to_rq(cmd);
 	struct scsi_device *sdp = cmd->device;
-	struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
+	struct gendisk *disk = rq->q->disk;
+	struct scsi_disk *sdkp = scsi_disk(disk);
 	sector_t lba = sectors_to_logical(sdp, blk_rq_pos(rq));
 	sector_t threshold;
 	unsigned int nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
@@ -1456,6 +1457,11 @@ static blk_status_t sd_setup_read_write_cmnd(struct scsi_cmnd *cmd)
 		goto fail;
 	}
 
+	/* Prevent read/write to offline zones of ZBC disks. */
+	if (sdkp->device->type == TYPE_ZBC &&
+	    disk_zone_is_offline(disk, blk_rq_pos(rq)))
+		goto fail;
+
 	/*
 	 * Some SD card readers can't handle accesses which touch the
 	 * last one or two logical blocks. Split accesses as needed.
-- 
2.55.0