Microsoft Hyper-V virtual disks currently only claim SPC-2 compliance causing
the kernel skip checks for features such as thin provisioning even though the
virtual disk advertises them.
Add a blacklist flag that can allow such devices to quirk past READ
CAPACITY(16) guards.
Signed-off-by: Sitsofe Wheeler <sits...@yahoo.com>
---
drivers/scsi/scsi_scan.c | 3 +++
drivers/scsi/sd.c | 3 +++
include/scsi/scsi_device.h | 1 +
include/scsi/scsi_devinfo.h | 1 +
4 files changed, 8 insertions(+)
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index ba3f1e8..d3f6267 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -962,6 +962,9 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned
char *inq_result,
else if (*bflags & BLIST_SKIP_VPD_PAGES)
sdev->skip_vpd_pages = 1;
+ if (*bflags & BLIST_TRY_RC16)
+ sdev->try_rc16 = 1;
+
transport_configure_device(&sdev->sdev_gendev);
if (sdev->host->hostt->slave_configure) {
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 0cb5c9f..0ccf372 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -2143,6 +2143,9 @@ static int sd_try_rc16_first(struct scsi_device *sdp)
return 0;
if (sdp->scsi_level > SCSI_SPC_2)
return 1;
+ if (sdp->try_rc16) {
+ return 1;
+ }
if (scsi_device_protection(sdp))
return 1;
return 0;
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index 27ecee7..d6e2bd8 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -155,6 +155,7 @@ struct scsi_device {
unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */
unsigned skip_vpd_pages:1; /* do not read VPD pages */
unsigned try_vpd_pages:1; /* attempt to read VPD pages */
+ unsigned try_rc16:1; /* attempt READ CAPACITY(16) */
unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
unsigned no_start_on_add:1; /* do not issue start on add */
unsigned allow_restart:1; /* issue START_UNIT in error handler */
diff --git a/include/scsi/scsi_devinfo.h b/include/scsi/scsi_devinfo.h
index 183eaab..9431f5e 100644
--- a/include/scsi/scsi_devinfo.h
+++ b/include/scsi/scsi_devinfo.h
@@ -36,5 +36,6 @@
for sequential scan */
#define BLIST_TRY_VPD_PAGES 0x10000000 /* Attempt to read VPD pages */
#define BLIST_NO_RSOC 0x20000000 /* don't try to issue RSOC */
+#define BLIST_TRY_RC16 0x40000000 /* Attempt READ CAPACITY(16) */
#endif
--
1.9.3
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