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| author | Akinobu Mita <akinobu.mita@gmail.com> | 2013-08-26 22:08:41 +0900 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2013-09-03 07:28:08 -0700 |
| commit | a027b5b90eb6b5ec5c5890a5e4e198f458ae94cb (patch) | |
| tree | d8406f527912266c7568a8d6f7e9eb64f92e14c9 | |
| parent | 150c3544b1d317fe32b1f279917c08638dad363f (diff) | |
[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 <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>
| -rw-r--r-- | drivers/scsi/scsi_debug.c | 10 |
1 files changed, 8 insertions, 2 deletions
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) |