Commit b90ebc3d5c41c9164ae04efd2e4f8204c2a186f1 ("[SCSI] scsi_debug:
fix logical block provisioning support") fixed several issues with
logical block provisioning support, but it still doesn't properly fix
the cases when unmap_alignment > 0. (for example, unmap_alignment=1
and unmap_granularity=3)
The problem is in map_index_to_lba(), which should return the first
LBA which is corresponding to a given index of provisioning map
(map_storep).
Signed-off-by: Akinobu Mita <akinobu.mita@xxxxxxxxx>
Cc: "James E.J. Bottomley" <JBottomley@xxxxxxxxxxxxx>
Cc: Douglas Gilbert <dgilbert@xxxxxxxxxxxx>
Cc: "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>
Cc: linux-scsi@xxxxxxxxxxxxxxx
---
drivers/scsi/scsi_debug.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 2f39b13..01c0ffa 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -1997,8 +1997,14 @@ static unsigned long lba_to_map_index(sector_t lba)
static sector_t map_index_to_lba(unsigned long index)
{
- return index * scsi_debug_unmap_granularity -
- scsi_debug_unmap_alignment;
+ sector_t lba = index * scsi_debug_unmap_granularity;
+
+ if (scsi_debug_unmap_alignment) {
+ lba -= scsi_debug_unmap_granularity -
+ scsi_debug_unmap_alignment;
+ }
+
+ return lba;
}
static unsigned int map_state(sector_t lba, unsigned int *num)
--
1.8.3.1
--
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