target: Cleanup unused se_task bits

This is a squashed version of the following se_task cleanup patches:

    target: remove the unused task_state_flags field in se_task
    target: remove the unused se_obj_ptr field in se_task
    target: remove the se_dev field in se_task
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

drivers/target/target_core_file.c

@@ -272,13 +272,14 @@ fd_alloc_task(unsigned char *cdb)
 static int fd_do_readv(struct se_task *task)
 {
 	struct fd_request *req = FILE_REQ(task);
-	struct fd_dev *dev = req->fd_task.se_dev->dev_ptr;
+	struct se_device *se_dev = req->fd_task.task_se_cmd->se_dev;
+	struct fd_dev *dev = se_dev->dev_ptr;
 	struct file *fd = dev->fd_file;
 	struct scatterlist *sg = task->task_sg;
 	struct iovec *iov;
 	mm_segment_t old_fs;
 	loff_t pos = (task->task_lba *
-		      task->se_dev->se_sub_dev->se_dev_attrib.block_size);
+		      se_dev->se_sub_dev->se_dev_attrib.block_size);
 	int ret = 0, i;
 
 	iov = kzalloc(sizeof(struct iovec) * task->task_sg_nents, GFP_KERNEL);
@@ -324,13 +325,14 @@ static int fd_do_readv(struct se_task *task)
 static int fd_do_writev(struct se_task *task)
 {
 	struct fd_request *req = FILE_REQ(task);
-	struct fd_dev *dev = req->fd_task.se_dev->dev_ptr;
+	struct se_device *se_dev = req->fd_task.task_se_cmd->se_dev;
+	struct fd_dev *dev = se_dev->dev_ptr;
 	struct file *fd = dev->fd_file;
 	struct scatterlist *sg = task->task_sg;
 	struct iovec *iov;
 	mm_segment_t old_fs;
 	loff_t pos = (task->task_lba *
-		      task->se_dev->se_sub_dev->se_dev_attrib.block_size);
+		      se_dev->se_sub_dev->se_dev_attrib.block_size);
 	int ret, i = 0;
 
 	iov = kzalloc(sizeof(struct iovec) * task->task_sg_nents, GFP_KERNEL);

drivers/target/target_core_iblock.c

@@ -499,7 +499,7 @@ static ssize_t iblock_show_configfs_dev_params(
 static void iblock_bio_destructor(struct bio *bio)
 {
 	struct se_task *task = bio->bi_private;
-	struct iblock_dev *ib_dev = task->se_dev->dev_ptr;
+	struct iblock_dev *ib_dev = task->task_se_cmd->se_dev->dev_ptr;
 
 	bio_free(bio, ib_dev->ibd_bio_set);
 }
@@ -507,7 +507,7 @@ static void iblock_bio_destructor(struct bio *bio)
 static struct bio *
 iblock_get_bio(struct se_task *task, sector_t lba, u32 sg_num)
 {
-	struct iblock_dev *ib_dev = task->se_dev->dev_ptr;
+	struct iblock_dev *ib_dev = task->task_se_cmd->se_dev->dev_ptr;
 	struct iblock_req *ib_req = IBLOCK_REQ(task);
 	struct bio *bio;
 

drivers/target/target_core_pscsi.c

@@ -676,7 +676,7 @@ static inline struct pscsi_plugin_task *PSCSI_TASK(struct se_task *task)
  */
 static int pscsi_transport_complete(struct se_task *task)
 {
-	struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr;
+	struct pscsi_dev_virt *pdv = task->task_se_cmd->se_dev->dev_ptr;
 	struct scsi_device *sd = pdv->pdv_sd;
 	int result;
 	struct pscsi_plugin_task *pt = PSCSI_TASK(task);
@@ -962,7 +962,7 @@ static inline struct bio *pscsi_get_bio(int sg_num)
 static int pscsi_map_sg(struct se_task *task, struct scatterlist *task_sg,
 		struct bio **hbio)
 {
-	struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr;
+	struct pscsi_dev_virt *pdv = task->task_se_cmd->se_dev->dev_ptr;
 	u32 task_sg_num = task->task_sg_nents;
 	struct bio *bio = NULL, *tbio = NULL;
 	struct page *page;
@@ -1062,7 +1062,7 @@ static int pscsi_map_sg(struct se_task *task, struct scatterlist *task_sg,
 
 static int pscsi_do_task(struct se_task *task)
 {
-	struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr;
+	struct pscsi_dev_virt *pdv = task->task_se_cmd->se_dev->dev_ptr;
 	struct pscsi_plugin_task *pt = PSCSI_TASK(task);
 	struct request *req;
 	struct bio *hbio;

drivers/target/target_core_rd.c

@@ -350,7 +350,7 @@ static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page)
 static int rd_MEMCPY_read(struct rd_request *req)
 {
 	struct se_task *task = &req->rd_task;
-	struct rd_dev *dev = req->rd_task.se_dev->dev_ptr;
+	struct rd_dev *dev = req->rd_task.task_se_cmd->se_dev->dev_ptr;
 	struct rd_dev_sg_table *table;
 	struct scatterlist *sg_d, *sg_s;
 	void *dst, *src;
@@ -466,7 +466,7 @@ static int rd_MEMCPY_read(struct rd_request *req)
 static int rd_MEMCPY_write(struct rd_request *req)
 {
 	struct se_task *task = &req->rd_task;
-	struct rd_dev *dev = req->rd_task.se_dev->dev_ptr;
+	struct rd_dev *dev = req->rd_task.task_se_cmd->se_dev->dev_ptr;
 	struct rd_dev_sg_table *table;
 	struct scatterlist *sg_d, *sg_s;
 	void *dst, *src;
@@ -581,7 +581,7 @@ static int rd_MEMCPY_write(struct rd_request *req)
  */
 static int rd_MEMCPY_do_task(struct se_task *task)
 {
-	struct se_device *dev = task->se_dev;
+	struct se_device *dev = task->task_se_cmd->se_dev;
 	struct rd_request *req = RD_REQ(task);
 	unsigned long long lba;
 	int ret;

drivers/target/target_core_transport.c

@@ -432,15 +432,14 @@ EXPORT_SYMBOL(transport_deregister_session);
  */
 static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
 {
-	struct se_device *dev;
+	struct se_device *dev = cmd->se_dev;
 	struct se_task *task;
 	unsigned long flags;
 
-	list_for_each_entry(task, &cmd->t_task_list, t_list) {
-		dev = task->se_dev;
-		if (!dev)
-			continue;
+	if (!dev)
+		return;
 
+	list_for_each_entry(task, &cmd->t_task_list, t_list) {
 		if (atomic_read(&task->task_active))
 			continue;
 
@@ -708,7 +707,7 @@ EXPORT_SYMBOL(transport_complete_sync_cache);
 void transport_complete_task(struct se_task *task, int success)
 {
 	struct se_cmd *cmd = task->task_se_cmd;
-	struct se_device *dev = task->se_dev;
+	struct se_device *dev = cmd->se_dev;
 	int t_state;
 	unsigned long flags;
 #if 0
@@ -886,14 +885,12 @@ static void __transport_add_task_to_execute_queue(
 
 static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
 {
-	struct se_device *dev;
+	struct se_device *dev = cmd->se_dev;
 	struct se_task *task;
 	unsigned long flags;
 
 	spin_lock_irqsave(&cmd->t_state_lock, flags);
 	list_for_each_entry(task, &cmd->t_task_list, t_list) {
-		dev = task->se_dev;
-
 		if (atomic_read(&task->task_state_active))
 			continue;
 
@@ -1522,7 +1519,6 @@ transport_generic_get_task(struct se_cmd *cmd,
 	INIT_LIST_HEAD(&task->t_state_list);
 	init_completion(&task->task_stop_comp);
 	task->task_se_cmd = cmd;
-	task->se_dev = dev;
 	task->task_data_direction = data_direction;
 
 	return task;
@@ -1802,7 +1798,7 @@ static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
 			spin_unlock_irqrestore(&cmd->t_state_lock,
 					flags);
 			transport_remove_task_from_execute_queue(task,
-					task->se_dev);
+					cmd->se_dev);
 
 			pr_debug("task_no[%d] - Removed from execute queue\n",
 				task->task_no);
@@ -2130,7 +2126,7 @@ static void transport_task_timeout_handler(unsigned long data)
  */
 static void transport_start_task_timer(struct se_task *task)
 {
-	struct se_device *dev = task->se_dev;
+	struct se_device *dev = task->task_se_cmd->se_dev;
 	int timeout;
 
 	if (task->task_flags & TF_RUNNING)
@@ -2656,13 +2652,16 @@ static void transport_xor_callback(struct se_cmd *cmd)
 static int transport_get_sense_data(struct se_cmd *cmd)
 {
 	unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
-	struct se_device *dev;
+	struct se_device *dev = cmd->se_dev;
 	struct se_task *task = NULL, *task_tmp;
 	unsigned long flags;
 	u32 offset = 0;
 
 	WARN_ON(!cmd->se_lun);
 
+	if (!dev)
+		return 0;
+
 	spin_lock_irqsave(&cmd->t_state_lock, flags);
 	if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
 		spin_unlock_irqrestore(&cmd->t_state_lock, flags);
@@ -2671,14 +2670,9 @@ static int transport_get_sense_data(struct se_cmd *cmd)
 
 	list_for_each_entry_safe(task, task_tmp,
 				&cmd->t_task_list, t_list) {
-
 		if (!task->task_sense)
 			continue;
 
-		dev = task->se_dev;
-		if (!dev)
-			continue;
-
 		if (!dev->transport->get_sense_buffer) {
 			pr_err("dev->transport->get_sense_buffer"
 					" is NULL\n");
@@ -3628,11 +3622,7 @@ static void transport_free_dev_tasks(struct se_cmd *cmd)
 		list_del(&task->t_list);
 
 		spin_unlock_irqrestore(&cmd->t_state_lock, flags);
-		if (task->se_dev)
-			task->se_dev->transport->free_task(task);
-		else
-			pr_err("task[%u] - task->se_dev is NULL\n",
-				task->task_no);
+		cmd->se_dev->transport->free_task(task);
 		spin_lock_irqsave(&cmd->t_state_lock, flags);
 	}
 	spin_unlock_irqrestore(&cmd->t_state_lock, flags);

include/target/target_core_base.h

@@ -405,7 +405,6 @@ struct se_task {
 	u8		task_scsi_status;
 	u8		task_flags;
 	int		task_error_status;
-	int		task_state_flags;
 	bool		task_padded_sg;
 	unsigned long long	task_lba;
 	u32		task_no;
@@ -413,7 +412,6 @@ struct se_task {
 	u32		task_size;
 	enum dma_data_direction	task_data_direction;
 	struct se_cmd *task_se_cmd;
-	struct se_device	*se_dev;
 	struct completion	task_stop_comp;
 	atomic_t	task_active;
 	atomic_t	task_execute_queue;
@@ -422,7 +420,6 @@ struct se_task {
 	atomic_t	task_stop;
 	atomic_t	task_state_active;
 	struct timer_list	task_timer;
-	struct se_device *se_obj_ptr;
 	struct list_head t_list;
 	struct list_head t_execute_list;
 	struct list_head t_state_list;

include/target/target_core_transport.h

@@ -45,9 +45,6 @@
 #define TRANSPORT_TIMEOUT_TYPE_TAPE		600
 #define TRANSPORT_TIMEOUT_TYPE_OTHER		300
 
-/* For se_task->task_state_flags */
-#define TSF_EXCEPTION_CLEARED			0x01
-
 /*
  * struct se_subsystem_dev->su_dev_flags
 */