Allow scsi device handler handle their own CDB and ship it down the
stream of scsi passthrough command setup flow, without any further
interventions.
This is useful for setting DRV-OP that implements vendor commands via
the scsi device handlers framework.
Signed-off-by: Avri Altman <avri.alt...@wdc.com>
---
drivers/scsi/scsi_lib.c | 5 +++--
drivers/scsi/sd.c | 9 +++++++++
2 files changed, 12 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 6b6dd40..4e98714 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1148,14 +1148,15 @@ static blk_status_t scsi_setup_fs_cmnd(struct
scsi_device *sdev,
{
struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(req);
+ cmd->cmnd = scsi_req(req)->cmd = scsi_req(req)->__cmd;
+ memset(cmd->cmnd, 0, BLK_MAX_CDB);
+
if (unlikely(sdev->handler && sdev->handler->prep_fn)) {
blk_status_t ret = sdev->handler->prep_fn(sdev, req);
if (ret != BLK_STS_OK)
return ret;
}
- cmd->cmnd = scsi_req(req)->cmd = scsi_req(req)->__cmd;
- memset(cmd->cmnd, 0, BLK_MAX_CDB);
return scsi_cmd_to_driver(cmd)->init_command(cmd);
}
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index a793cb0..246bef8 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1221,6 +1221,14 @@ static blk_status_t sd_setup_read_write_cmnd(struct
scsi_cmnd *cmd)
} else if (sdp->use_16_for_rw || (nr_blocks > 0xffff)) {
ret = sd_setup_rw16_cmnd(cmd, write, lba, nr_blocks,
protect | fua);
+ } else if (unlikely(sdp->handler && blk_rq_is_private(rq))) {
+ /*
+ * scsi device handler that implements vendor commands -
+ * the command was already constructed in the device handler's
+ * prep_fn, so no need to do anything here
+ */
+ rq->cmd_flags = REQ_OP_READ;
+ ret = BLK_STS_OK;
} else if ((nr_blocks > 0xff) || (lba > 0x1fffff) ||
sdp->use_10_for_rw || protect) {
ret = sd_setup_rw10_cmnd(cmd, write, lba, nr_blocks,
@@ -1285,6 +1293,7 @@ static blk_status_t sd_init_command(struct scsi_cmnd *cmd)
return sd_setup_write_same_cmnd(cmd);
case REQ_OP_FLUSH:
return sd_setup_flush_cmnd(cmd);
+ case REQ_OP_DRV_IN:
case REQ_OP_READ:
case REQ_OP_WRITE:
return sd_setup_read_write_cmnd(cmd);
--
2.7.4
