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target: merge transport_generic_write_pending into transport_generic_new_cmd 

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Christoph Hellwig 2012-07-08 15:58:41 -04:00 committed by Nicholas Bellinger
parent d59a02b4eb
commit c3196f0cf0
1 changed files with 26 additions and 48 deletions
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74
drivers/target/target_core_transport.c
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@ -66,7 +66,6 @@ struct kmem_cache *t10_alua_lu_gp_mem_cache;
struct kmem_cache *t10_alua_tg_pt_gp_cache;
struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
static int transport_generic_write_pending(struct se_cmd *);
static int transport_processing_thread(void *param);
static void transport_complete_task_attr(struct se_cmd *cmd);
static void transport_handle_queue_full(struct se_cmd *cmd,
@ -2487,23 +2486,39 @@ int transport_generic_new_cmd(struct se_cmd *cmd)
atomic_inc(&cmd->t_fe_count);
/*
* For WRITEs, let the fabric know its buffer is ready.
*
* The command will be added to the execution queue after its write
* data has arrived.
*
* Everything else but a WRITE, add the command to the execution queue.
* If this command is not a write we can execute it right here,
* for write buffers we need to notify the fabric driver first
* and let it call back once the write buffers are ready.
*/
target_add_to_state_list(cmd);
if (cmd->data_direction == DMA_TO_DEVICE)
return transport_generic_write_pending(cmd);
target_execute_cmd(cmd);
return 0;
if (cmd->data_direction != DMA_TO_DEVICE) {
target_execute_cmd(cmd);
return 0;
}
spin_lock_irq(&cmd->t_state_lock);
cmd->t_state = TRANSPORT_WRITE_PENDING;
spin_unlock_irq(&cmd->t_state_lock);
transport_cmd_check_stop(cmd, false);
ret = cmd->se_tfo->write_pending(cmd);
if (ret == -EAGAIN || ret == -ENOMEM)
goto queue_full;
if (ret < 0)
return ret;
return 1;
out_fail:
cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -EINVAL;
queue_full:
pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
transport_handle_queue_full(cmd, cmd->se_dev);
return 0;
}
EXPORT_SYMBOL(transport_generic_new_cmd);
@ -2519,43 +2534,6 @@ static void transport_write_pending_qf(struct se_cmd *cmd)
}
}
static int transport_generic_write_pending(struct se_cmd *cmd)
{
unsigned long flags;
int ret;
spin_lock_irqsave(&cmd->t_state_lock, flags);
cmd->t_state = TRANSPORT_WRITE_PENDING;
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
/*
* Clear the se_cmd for WRITE_PENDING status in order to set
* CMD_T_ACTIVE so that transport_generic_handle_data can be called
* from HW target mode interrupt code. This is safe to be called
* with remove_from_lists false before the cmd->se_tfo->write_pending
* because the se_cmd->se_lun pointer is not being cleared.
*/
transport_cmd_check_stop(cmd, false);
/*
* Call the fabric write_pending function here to let the
* frontend know that WRITE buffers are ready.
*/
ret = cmd->se_tfo->write_pending(cmd);
if (ret == -EAGAIN || ret == -ENOMEM)
goto queue_full;
else if (ret < 0)
return ret;
return 1;
queue_full:
pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
transport_handle_queue_full(cmd, cmd->se_dev);
return 0;
}
void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
{
if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {