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[SCSI] scsi_debug: fix logical block provisioning support when unmap_alignment != 0

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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 <akinobu.mita@gmail.com>
Acked-by: "Martin K. Petersen" <martin.petersen@oracle.com>
Acked-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Akinobu Mita 2013-08-26 22:08:41 +09:00 committed by James Bottomley
parent 150c3544b1
commit a027b5b90e
1 changed files with 8 additions and 2 deletions
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10
drivers/scsi/scsi_debug.c
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@ -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)