Copy directly from the se_cmd CDB to the one in the scsi_request. This
temporarily limits the pscsi backend to supporting only up to 16 byte
CDBs, but this restriction will be lifted later in this series.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
drivers/target/target_core_pscsi.c | 51 ++++++++++--------------------
drivers/target/target_core_pscsi.h | 4 ---
2 files changed, 17 insertions(+), 38 deletions(-)
diff --git a/drivers/target/target_core_pscsi.c b/drivers/target/target_core_pscsi.c
index 807d06ecadee2..622158ed5d9ce 100644
--- a/drivers/target/target_core_pscsi.c
+++ b/drivers/target/target_core_pscsi.c
@@ -593,16 +593,14 @@ static void pscsi_complete_cmd(struct se_cmd *cmd, u8 scsi_status,
{
struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
struct scsi_device *sd = pdv->pdv_sd;
- struct pscsi_plugin_task *pt = cmd->priv;
- unsigned char *cdb;
+ unsigned char *cdb = cmd->priv;
+
/*
- * Special case for REPORT_LUNs handling where pscsi_plugin_task has
- * not been allocated because TCM is handling the emulation directly.
+ * Special case for REPORT_LUNs which is emulated and not passed on.
*/
- if (!pt)
+ if (!cdb)
return;
- cdb = &pt->pscsi_cdb[0];
/*
* Hack to make sure that Write-Protect modepage is set if R/O mode is
* forced.
@@ -963,30 +961,14 @@ pscsi_execute_cmd(struct se_cmd *cmd)
struct scatterlist *sgl = cmd->t_data_sg;
u32 sgl_nents = cmd->t_data_nents;
struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
- struct pscsi_plugin_task *pt;
struct request *req;
sense_reason_t ret;
- /*
- * Dynamically alloc cdb space, since it may be larger than
- * TCM_MAX_COMMAND_SIZE
- */
- pt = kzalloc(sizeof(*pt) + scsi_command_size(cmd->t_task_cdb), GFP_KERNEL);
- if (!pt) {
- return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
- }
- cmd->priv = pt;
-
- memcpy(pt->pscsi_cdb, cmd->t_task_cdb,
- scsi_command_size(cmd->t_task_cdb));
-
req = scsi_alloc_request(pdv->pdv_sd->request_queue,
cmd->data_direction == DMA_TO_DEVICE ?
REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
- if (IS_ERR(req)) {
- ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
- goto fail;
- }
+ if (IS_ERR(req))
+ return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
if (sgl) {
ret = pscsi_map_sg(cmd, sgl, sgl_nents, req);
@@ -996,8 +978,12 @@ pscsi_execute_cmd(struct se_cmd *cmd)
req->end_io = pscsi_req_done;
req->end_io_data = cmd;
- scsi_req(req)->cmd_len = scsi_command_size(pt->pscsi_cdb);
- scsi_req(req)->cmd = &pt->pscsi_cdb[0];
+ scsi_req(req)->cmd_len = scsi_command_size(cmd->t_task_cdb);
+ if (scsi_req(req)->cmd_len > BLK_MAX_CDB) {
+ ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+ goto fail_put_request;
+ }
+ memcpy(scsi_req(req)->cmd, cmd->t_task_cdb, scsi_req(req)->cmd_len);
if (pdv->pdv_sd->type == TYPE_DISK ||
pdv->pdv_sd->type == TYPE_ZBC)
req->timeout = PS_TIMEOUT_DISK;
@@ -1005,6 +991,8 @@ pscsi_execute_cmd(struct se_cmd *cmd)
req->timeout = PS_TIMEOUT_OTHER;
scsi_req(req)->retries = PS_RETRY;
+ cmd->priv = scsi_req(req)->cmd;
+
blk_execute_rq_nowait(req, cmd->sam_task_attr == TCM_HEAD_TAG,
pscsi_req_done);
@@ -1012,8 +1000,6 @@ pscsi_execute_cmd(struct se_cmd *cmd)
fail_put_request:
blk_mq_free_request(req);
-fail:
- kfree(pt);
return ret;
}
@@ -1041,14 +1027,13 @@ static sector_t pscsi_get_blocks(struct se_device *dev)
static void pscsi_req_done(struct request *req, blk_status_t status)
{
struct se_cmd *cmd = req->end_io_data;
- struct pscsi_plugin_task *pt = cmd->priv;
int result = scsi_req(req)->result;
enum sam_status scsi_status = result & 0xff;
+ u8 *cdb = cmd->priv;
if (scsi_status != SAM_STAT_GOOD) {
pr_debug("PSCSI Status Byte exception at cmd: %p CDB:"
- " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
- result);
+ " 0x%02x Result: 0x%08x\n", cmd, cdb[0], result);
}
pscsi_complete_cmd(cmd, scsi_status, scsi_req(req)->sense);
@@ -1060,14 +1045,12 @@ static void pscsi_req_done(struct request *req, blk_status_t status)
break;
default:
pr_debug("PSCSI Host Byte exception at cmd: %p CDB:"
- " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
- result);
+ " 0x%02x Result: 0x%08x\n", cmd, cdb[0], result);
target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
break;
}
blk_mq_free_request(req);
- kfree(pt);
}
static const struct target_backend_ops pscsi_ops = {
diff --git a/drivers/target/target_core_pscsi.h b/drivers/target/target_core_pscsi.h
index e8458b5e85c92..23d9a6e340d41 100644
--- a/drivers/target/target_core_pscsi.h
+++ b/drivers/target/target_core_pscsi.h
@@ -23,10 +23,6 @@ struct block_device;
struct scsi_device;
struct Scsi_Host;
-struct pscsi_plugin_task {
- unsigned char pscsi_cdb[0];
-} ____cacheline_aligned;
-
#define PDF_HAS_CHANNEL_ID 0x01
#define PDF_HAS_TARGET_ID 0x02
#define PDF_HAS_LUN_ID 0x04
--
2.30.2
