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

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Link: https://lore.kernel.org/r/20210806040023.5355-2-martin.petersen@oracle.com
Cc: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Martin K. Petersen 2021-08-06 00:00:19 -04:00
parent 2266a2def9
commit 6a20e21ae1
1 changed files with 7 additions and 0 deletions
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7
include/scsi/scsi_cmnd.h
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@ -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.