target: replace ->get_cdb with a target_get_task_cdb helper

Instead of calling out to the backends from the core to get a per-task
CDB and then modify it for the LBA/len pair used for this CDB provide
a helper that writes the adjusted CDB into a provided buffer and call
this method from ->do_task in pscsi.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

3 files changed, 18 insertions, 31 deletions

diff --git a/drivers/target/target_core_cdb.c b/drivers/target/target_core_cdb.c
index 0d02391d1fb1..fb0b6308038b 100644
--- a/drivers/target/target_core_cdb.c
+++ b/drivers/target/target_core_cdb.c
@@ -1265,3 +1265,19 @@ transport_emulate_control_cdb(struct se_task *task)
 
         return PYX_TRANSPORT_SENT_TO_TRANSPORT;
 }
+
+/*
+ * Write a CDB into @cdb that is based on the one the intiator sent us,
+ * but updated to only cover the sectors that the current task handles.
+ */
+void target_get_task_cdb(struct se_task *task, unsigned char *cdb)
+{
+        struct se_cmd *cmd = task->task_se_cmd;
+
+        memcpy(cdb, cmd->t_task_cdb, scsi_command_size(cmd->t_task_cdb));
+        if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
+                cmd->transport_split_cdb(task->task_lba, task->task_sectors,
+                                         cdb);
+        }
+}
+EXPORT_SYMBOL(target_get_task_cdb);
diff --git a/drivers/target/target_core_pscsi.c b/drivers/target/target_core_pscsi.c
index b347862bf801..936b9fec4cca 100644
--- a/drivers/target/target_core_pscsi.c
+++ b/drivers/target/target_core_pscsi.c
@@ -1068,6 +1068,8 @@ static int pscsi_do_task(struct se_task *task)
         struct bio *hbio;
         int ret;
 
+        target_get_task_cdb(task, pt->pscsi_cdb);
+
         if (task->task_se_cmd->se_cmd_flags & SCF_SCSI_NON_DATA_CDB) {
                 req = blk_get_request(pdv->pdv_sd->request_queue,
                                 (task->task_data_direction == DMA_TO_DEVICE),
@@ -1150,18 +1152,6 @@ fail:
         return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
 }
 
-
-/*      pscsi_get_cdb():
- *
- *
- */
-static unsigned char *pscsi_get_cdb(struct se_task *task)
-{
-        struct pscsi_plugin_task *pt = PSCSI_TASK(task);
-
-        return pt->pscsi_cdb;
-}
-
 /*      pscsi_get_sense_buffer():
  *
  *
@@ -1276,7 +1266,6 @@ static struct se_subsystem_api pscsi_template = {
         .check_configfs_dev_params = pscsi_check_configfs_dev_params,
         .set_configfs_dev_params = pscsi_set_configfs_dev_params,
         .show_configfs_dev_params = pscsi_show_configfs_dev_params,
-        .get_cdb                = pscsi_get_cdb,
         .get_sense_buffer       = pscsi_get_sense_buffer,
         .get_device_rev         = pscsi_get_device_rev,
         .get_device_type        = pscsi_get_device_type,
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 895969650a27..3025a6f5ab56 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -3958,17 +3958,6 @@ static int transport_allocate_data_tasks(
                 task->task_sectors = min(sectors, dev_max_sectors);
                 task->task_size = task->task_sectors * sector_size;
 
-                if (dev->transport->get_cdb) {
-                        unsigned char *cdb = dev->transport->get_cdb(task);
-
-                        memcpy(cdb, cmd->t_task_cdb,
-                               scsi_command_size(cmd->t_task_cdb));
-
-                        /* Update new cdb with updated lba/sectors */
-                        cmd->transport_split_cdb(task->task_lba,
-                                                 task->task_sectors, cdb);
-                }
-
                 /*
                  * This now assumes that passed sg_ents are in PAGE_SIZE chunks
                  * in order to calculate the number per task SGL entries
@@ -4022,7 +4011,6 @@ static int transport_allocate_data_tasks(
 static int
 transport_allocate_control_task(struct se_cmd *cmd)
 {
-        struct se_device *dev = cmd->se_dev;
         struct se_task *task;
         unsigned long flags;
 
@@ -4030,12 +4018,6 @@ transport_allocate_control_task(struct se_cmd *cmd)
         if (!task)
                 return -ENOMEM;
 
-        if (dev->transport->get_cdb) {
-                unsigned char *cdb = dev->transport->get_cdb(task);
-
-                memcpy(cdb, cmd->t_task_cdb, scsi_command_size(cmd->t_task_cdb));
-        }
-
         task->task_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
                                 GFP_KERNEL);
         if (!task->task_sg) {