target: simplify UNMAP handling

Move a little more processing into the core code, and lift the previous
do_unmap callback into the sbc_ops structure.

Signed-off-by: Christoph Hellwig <[e-mail]>
Reviewed-by: Andy Grover <[e-mail]>
Signed-off-by: Nicholas Bellinger <[e-mail]>

drivers/target/target_core_file.c

···
 }
 
 static sense_reason_t
-fd_do_unmap(struct se_cmd *cmd, void *priv, sector_t lba, sector_t nolb)
+fd_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb)
 {
-	struct file *file = priv;
+	struct file *file = FD_DEV(cmd->se_dev)->fd_file;
 	struct inode *inode = file->f_mapping->host;
 	int ret;
 
···
 static sense_reason_t
 fd_execute_write_same_unmap(struct se_cmd *cmd)
 {
-	struct se_device *se_dev = cmd->se_dev;
-	struct fd_dev *fd_dev = FD_DEV(se_dev);
-	struct file *file = fd_dev->fd_file;
 	sector_t lba = cmd->t_task_lba;
 	sector_t nolb = sbc_get_write_same_sectors(cmd);
 	sense_reason_t ret;
···
 		return 0;
 	}
 
-	ret = fd_do_unmap(cmd, file, lba, nolb);
+	ret = fd_execute_unmap(cmd, lba, nolb);
 	if (ret)
 		return ret;
 
 	target_complete_cmd(cmd, GOOD);
 	return 0;
-}
-
-static sense_reason_t
-fd_execute_unmap(struct se_cmd *cmd)
-{
-	struct file *file = FD_DEV(cmd->se_dev)->fd_file;
-
-	return sbc_execute_unmap(cmd, fd_do_unmap, file);
 }
 
 static sense_reason_t

drivers/target/target_core_iblock.c

···
 }
 
 static sense_reason_t
-iblock_do_unmap(struct se_cmd *cmd, void *priv,
-		sector_t lba, sector_t nolb)
+iblock_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb)
 {
-	struct block_device *bdev = priv;
+	struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd;
 	int ret;
 
 	ret = blkdev_issue_discard(bdev, lba, nolb, GFP_KERNEL, 0);
···
 }
 
 static sense_reason_t
-iblock_execute_unmap(struct se_cmd *cmd)
-{
-	struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd;
-
-	return sbc_execute_unmap(cmd, iblock_do_unmap, bdev);
-}
-
-static sense_reason_t
 iblock_execute_write_same_unmap(struct se_cmd *cmd)
 {
-	struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd;
 	sector_t lba = cmd->t_task_lba;
 	sector_t nolb = sbc_get_write_same_sectors(cmd);
 	sense_reason_t ret;
 
-	ret = iblock_do_unmap(cmd, bdev, lba, nolb);
+	ret = iblock_execute_unmap(cmd, lba, nolb);
 	if (ret)
 		return ret;
 

drivers/target/target_core_sbc.c

···
 
 static sense_reason_t
 sbc_check_prot(struct se_device *, struct se_cmd *, unsigned char *, u32, bool);
+static sense_reason_t sbc_execute_unmap(struct se_cmd *cmd);
 
 static sense_reason_t
 sbc_emulate_readcapacity(struct se_cmd *cmd)
···
 			return TCM_UNSUPPORTED_SCSI_OPCODE;
 		}
 		size = get_unaligned_be16(&cdb[7]);
-		cmd->execute_cmd = ops->execute_unmap;
+		cmd->execute_cmd = sbc_execute_unmap;
 		break;
 	case WRITE_SAME_16:
 		sectors = transport_get_sectors_16(cdb);
···
 }
 EXPORT_SYMBOL(sbc_get_device_type);
 
-sense_reason_t
-sbc_execute_unmap(struct se_cmd *cmd,
-	sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *,
-				      sector_t, sector_t),
-	void *priv)
+static sense_reason_t
+sbc_execute_unmap(struct se_cmd *cmd)
 {
+	struct sbc_ops *ops = cmd->protocol_data;
 	struct se_device *dev = cmd->se_dev;
 	unsigned char *buf, *ptr = NULL;
 	sector_t lba;
···
 			goto err;
 		}
 
-		ret = do_unmap_fn(cmd, priv, lba, range);
+		ret = ops->execute_unmap(cmd, lba, range);
 		if (ret)
 			goto err;
 
···
 		target_complete_cmd(cmd, GOOD);
 	return ret;
 }
-EXPORT_SYMBOL(sbc_execute_unmap);
 
 void
 sbc_dif_generate(struct se_cmd *cmd)

include/target/target_core_backend.h

···
 	sense_reason_t (*execute_sync_cache)(struct se_cmd *cmd);
 	sense_reason_t (*execute_write_same)(struct se_cmd *cmd);
 	sense_reason_t (*execute_write_same_unmap)(struct se_cmd *cmd);
-	sense_reason_t (*execute_unmap)(struct se_cmd *cmd);
+	sense_reason_t (*execute_unmap)(struct se_cmd *cmd,
+				sector_t lba, sector_t nolb);
 };
 
 int	transport_backend_register(const struct target_backend_ops *);
···
 u32	sbc_get_device_rev(struct se_device *dev);
 u32	sbc_get_device_type(struct se_device *dev);
 sector_t	sbc_get_write_same_sectors(struct se_cmd *cmd);
-sense_reason_t sbc_execute_unmap(struct se_cmd *cmd,
-	sense_reason_t (*do_unmap_fn)(struct se_cmd *cmd, void *priv,
-				      sector_t lba, sector_t nolb),
-	void *priv);
 void	sbc_dif_generate(struct se_cmd *);
 sense_reason_t	sbc_dif_verify(struct se_cmd *, sector_t, unsigned int,
 				     unsigned int, struct scatterlist *, int);