Messages in this thread Patch in this message | | | Date | Thu, 24 Jul 2014 08:58:15 +0100 | From | Sitsofe Wheeler <> | Subject | [PATCH 3/3] [SCSI] Make LBP quirk skip lbpme checks tests |
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Some block devices (such as Hyper-V passthrough SSDs) support logical block provisioning (e.g. via UNMAP) but don't set lbpme thus disabling discard. If the try_lbp quirk is in use skip lbpme checks that lead up to the logical block provisioning tests.
Signed-off-by: Sitsofe Wheeler <sitsofe@yahoo.com> --- drivers/scsi/sd.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 8249e51..8bf34bc 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -2559,7 +2559,7 @@ static void sd_read_block_limits(struct scsi_disk *sdkp) sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]); - if (!sdkp->lbpme) + if (!sdkp->lbpme && !sdkp->device->try_lbp) goto out; lba_count = get_unaligned_be32(&buffer[20]); @@ -2633,7 +2633,7 @@ static void sd_read_block_provisioning(struct scsi_disk *sdkp) unsigned char *buffer; const int vpd_len = 8; - if (sdkp->lbpme == 0) + if (sdkp->lbpme == 0 && sdkp->device->test_lbp == 0) return; buffer = kmalloc(vpd_len, GFP_KERNEL); -- 1.9.3
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