Commit 6a20e21a authored by Martin K. Petersen's avatar Martin K. Petersen
Browse files

scsi: core: Add helper to return number of logical blocks in a request 

Link: https://lore.kernel.org/r/20210806040023.5355-2-martin.petersen@oracle.com


Cc: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: default avatarBart Van Assche <bvanassche@acm.org>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent 2266a2de

include/scsi/scsi_cmnd.h

+7 −0
Original line number Diff line number Diff line
@@ -237,6 +237,13 @@ static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd) 
	return blk_rq_pos(scsi_cmd_to_rq(scmd)) >> shift;

}



static inline unsigned int scsi_logical_block_count(struct scsi_cmnd *scmd)

{

	unsigned int shift = ilog2(scmd->device->sector_size) - SECTOR_SHIFT;



	return blk_rq_bytes(scsi_cmd_to_rq(scmd)) >> shift;

}



/*

 * The operations below are hints that tell the controller driver how

 * to handle I/Os with DIF or similar types of protection information.