On 06/08/2024 08:26, Chaotian Jing wrote:
scsi_logical_block_count() should return the block count of scsi device,
scsi command, not scsi device
but the original code has a wrong implement.
Signed-off-by: Chaotian Jing <chaotian.jing@xxxxxxxxxxxx>
---
include/scsi/scsi_cmnd.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index 45c40d200154..f0be0caa295a 100644
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -236,7 +236,7 @@ static inline unsigned int scsi_logical_block_count(struct scsi_cmnd *scmd)
I find it questionable why we have this in the core code, since it's
only used in error handling logs for one driver. And obviously no one
was paying attention to it.
{
unsigned int shift = ilog2(scmd->device->sector_size) - SECTOR_SHIFT;
- return blk_rq_bytes(scsi_cmd_to_rq(scmd)) >> shift;
+ return blk_rq_sectors(scsi_cmd_to_rq(scmd)) >> shift;
blk_rq_sectors() converts from bytes to linux sectors, and then we shift
it by diff in linux sectors and LBS.
To me, if this were used in fastpath - which it isn't - the following
seems better:
return blk_rq_bytes(scsi_cmd_to_rq(scmd)) / scmd->device->sector_size;
}
/*
