target: remove the task_size field in struct se_task

Now that we don't split commands the size field in the task is always
equivalent to the one in the CDB, even in cases where we have two tasks
due to a BIDI transfer.  Just refer the the size in the command instead
of duplicating it in the task.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

drivers/target/target_core_file.c

@@ -300,10 +300,10 @@ static int fd_do_readv(struct se_task *task)
 	 * block_device.
 	 */
 	if (S_ISBLK(fd->f_dentry->d_inode->i_mode)) {
-		if (ret < 0 || ret != task->task_size) {
+		if (ret < 0 || ret != task->task_se_cmd->data_length) {
 			pr_err("vfs_readv() returned %d,"
 				" expecting %d for S_ISBLK\n", ret,
-				(int)task->task_size);
+				(int)task->task_se_cmd->data_length);
 			return (ret < 0 ? ret : -EINVAL);
 		}
 	} else {
@@ -348,7 +348,7 @@ static int fd_do_writev(struct se_task *task)
 
 	kfree(iov);
 
-	if (ret < 0 || ret != task->task_size) {
+	if (ret < 0 || ret != task->task_se_cmd->data_length) {
 		pr_err("vfs_writev() returned %d\n", ret);
 		return (ret < 0 ? ret : -EINVAL);
 	}
@@ -404,11 +404,12 @@ static void fd_emulate_write_fua(struct se_cmd *cmd, struct se_task *task)
 	struct fd_dev *fd_dev = dev->dev_ptr;
 	loff_t start = task->task_se_cmd->t_task_lba *
 		dev->se_sub_dev->se_dev_attrib.block_size;
-	loff_t end = start + task->task_size;
+	loff_t end = start + task->task_se_cmd->data_length;
 	int ret;
 
 	pr_debug("FILEIO: FUA WRITE LBA: %llu, bytes: %u\n",
-			task->task_se_cmd->t_task_lba, task->task_size);
+			task->task_se_cmd->t_task_lba,
+			task->task_se_cmd->data_length);
 
 	ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1);
 	if (ret != 0)

drivers/target/target_core_iblock.c

@@ -478,7 +478,8 @@ iblock_get_bio(struct se_task *task, sector_t lba, u32 sg_num)
 
 	pr_debug("Allocated bio: %p task_sg_nents: %u using ibd_bio_set:"
 		" %p\n", bio, task->task_sg_nents, ib_dev->ibd_bio_set);
-	pr_debug("Allocated bio: %p task_size: %u\n", bio, task->task_size);
+	pr_debug("Allocated bio: %p task_size: %u\n", bio,
+		task->task_se_cmd->data_length);
 
 	bio->bi_bdev = ib_dev->ibd_bd;
 	bio->bi_private = task;

drivers/target/target_core_pscsi.c

@@ -967,8 +967,8 @@ static int pscsi_map_sg(struct se_task *task, struct scatterlist *task_sg,
 	struct bio *bio = NULL, *tbio = NULL;
 	struct page *page;
 	struct scatterlist *sg;
-	u32 data_len = task->task_size, i, len, bytes, off;
-	int nr_pages = (task->task_size + task_sg[0].offset +
+	u32 data_len = cmd->data_length, i, len, bytes, off;
+	int nr_pages = (cmd->data_length + task_sg[0].offset +
 			PAGE_SIZE - 1) >> PAGE_SHIFT;
 	int nr_vecs = 0, rc;
 	int rw = (task->task_data_direction == DMA_TO_DEVICE);
@@ -1085,7 +1085,7 @@ static int pscsi_do_task(struct se_task *task)
 			return -ENODEV;
 		}
 	} else {
-		BUG_ON(!task->task_size);
+		BUG_ON(!cmd->data_length);
 
 		/*
 		 * Setup the main struct request for the task->task_sg[] payload

drivers/target/target_core_rd.c

@@ -307,7 +307,7 @@ static int rd_do_task(struct se_task *task)
 		se_dev->se_sub_dev->se_dev_attrib.block_size;
 	rd_offset = do_div(tmp, PAGE_SIZE);
 	rd_page = tmp;
-	rd_size = task->task_size;
+	rd_size = task->task_se_cmd->data_length;
 
 	table = rd_get_sg_table(dev, rd_page);
 	if (!table)

drivers/target/target_core_transport.c

@@ -3722,7 +3722,6 @@ transport_allocate_data_tasks(struct se_cmd *cmd,
 
 	task->task_sg = cmd_sg;
 	task->task_sg_nents = sgl_nents;
-	task->task_size = cmd->data_length;
 
 	task->task_sectors = sectors;
 
@@ -3749,7 +3748,6 @@ transport_allocate_control_task(struct se_cmd *cmd)
 		return -ENOMEM;
 
 	task->task_sg = cmd->t_data_sg;
-	task->task_size = cmd->data_length;
 	task->task_sg_nents = cmd->t_data_nents;
 
 	spin_lock_irqsave(&cmd->t_state_lock, flags);

include/target/target_core_base.h

@@ -487,7 +487,6 @@ struct se_queue_obj {
 
 struct se_task {
 	u32			task_sectors;
-	u32			task_size;
 	struct se_cmd		*task_se_cmd;
 	struct scatterlist	*task_sg;
 	u32			task_sg_nents;