target: pass a block_device to target_configure_unmap_from_queue

The SCSI target drivers is a consumer of the block layer and shoul
d generally work on struct block_device.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20220415045258.199825-3-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/target/target_core_device.c

@@ -834,9 +834,10 @@ struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
  * in ATA and we need to set TPE=1
  */
 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
-				       struct request_queue *q)
+				       struct block_device *bdev)
 {
-	int block_size = queue_logical_block_size(q);
+	struct request_queue *q = bdev_get_queue(bdev);
+	int block_size = bdev_logical_block_size(bdev);
 
 	if (!blk_queue_discard(q))
 		return false;

drivers/target/target_core_file.c

@@ -134,10 +134,11 @@ static int fd_configure_device(struct se_device *dev)
 	 */
 	inode = file->f_mapping->host;
 	if (S_ISBLK(inode->i_mode)) {
-		struct request_queue *q = bdev_get_queue(I_BDEV(inode));
+		struct block_device *bdev = I_BDEV(inode);
+		struct request_queue *q = bdev_get_queue(bdev);
 		unsigned long long dev_size;
 
-		fd_dev->fd_block_size = bdev_logical_block_size(I_BDEV(inode));
+		fd_dev->fd_block_size = bdev_logical_block_size(bdev);
 		/*
 		 * Determine the number of bytes from i_size_read() minus
 		 * one (1) logical sector from underlying struct block_device
@@ -150,7 +151,7 @@ static int fd_configure_device(struct se_device *dev)
 			dev_size, div_u64(dev_size, fd_dev->fd_block_size),
 			fd_dev->fd_block_size);
 
-		if (target_configure_unmap_from_queue(&dev->dev_attrib, q))
+		if (target_configure_unmap_from_queue(&dev->dev_attrib, bdev))
 			pr_debug("IFILE: BLOCK Discard support available,"
 				 " disabled by default\n");
 		/*

drivers/target/target_core_iblock.c

@@ -119,7 +119,7 @@ static int iblock_configure_device(struct se_device *dev)
 	dev->dev_attrib.hw_max_sectors = queue_max_hw_sectors(q);
 	dev->dev_attrib.hw_queue_depth = q->nr_requests;
 
-	if (target_configure_unmap_from_queue(&dev->dev_attrib, q))
+	if (target_configure_unmap_from_queue(&dev->dev_attrib, bd))
 		pr_debug("IBLOCK: BLOCK Discard support available,"
 			 " disabled by default\n");
 

include/target/target_core_backend.h

@@ -14,7 +14,7 @@
 #define TRANSPORT_FLAG_PASSTHROUGH_ALUA		0x2
 #define TRANSPORT_FLAG_PASSTHROUGH_PGR          0x4
 
-struct request_queue;
+struct block_device;
 struct scatterlist;
 
 struct target_backend_ops {
@@ -117,7 +117,7 @@ sense_reason_t passthrough_parse_cdb(struct se_cmd *cmd,
 bool target_sense_desc_format(struct se_device *dev);
 sector_t target_to_linux_sector(struct se_device *dev, sector_t lb);
 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
-				       struct request_queue *q);
+				       struct block_device *bdev);
 
 static inline bool target_dev_configured(struct se_device *se_dev)
 {