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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/[email protected]
Cc: Bart Van Assche <[email protected]>
Reviewed-by: Bart Van Assche <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>
This commit is contained in:
Martin K. Petersen committed 2021-08-11 22:25:43 -04:00
1 parent 2266a2def9
commit 6a20e21ae1
1 file changed
+7
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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.