From: Akinobu Mita Date: Mon, 26 Aug 2013 13:08:41 +0000 (+0900) Subject: [SCSI] scsi_debug: fix logical block provisioning support when unmap_alignment != 0 X-Git-Tag: firefly_0821_release~176^2~5295^2~51 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=a027b5b90eb6b5ec5c5890a5e4e198f458ae94cb;p=firefly-linux-kernel-4.4.55.git [SCSI] scsi_debug: fix logical block provisioning support when unmap_alignment != 0 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, load scsi_debug module with the following module parameters and make all blocks mapped by filling the storage with zero. # modprobe scsi_debug lbpu=1 unmap_alignment=1 unmap_granularity=4 # dd if=/dev/zero of=$DEV Then, try to unmap the first unmappable blocks at lba=1, but GET LBA STATUS unexpectedly reports that the last UNMAP has done nothing. # sg_unmap --lba=1 --num=4 $DEV # sg_get_lba_status --lba=1 $DEV descriptor LBA: 0x0000000000000001 blocks: 16383 mapped 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 Acked-by: "Martin K. Petersen" Acked-by: Douglas Gilbert Signed-off-by: James Bottomley --- diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c index 2f39b13c7130..01c0ffa31276 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)