[SCSI] scsi_debug: fix Thin provisioning support

While testing scsi_debug with these patches I found a
problem with the Block Limits VPD page function. The
length returned by the inquiry_evpd_b0() function was
too short. A patch to fix that and a cosmetic change
(that the form factor of scsi_debug is less than 1.8
inches) is attached.

Signed-off-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 9 insertions, 4 deletions

diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index cb4bf16b4e66..0b575c871007 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -685,10 +685,12 @@ static int inquiry_evpd_89(unsigned char * arr)
 }
 
 
+/* Block limits VPD page (SBC-3) */
 static unsigned char vpdb0_data[] = {
-        /* from 4th byte */ 0,0,0,4,
-        0,0,0x4,0,
-        0,0,0,64,
+        /* from 4th byte */ 0,0,0,4, 0,0,0x4,0, 0,0,0,64,
+        0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+        0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+        0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 };
 
 static int inquiry_evpd_b0(unsigned char * arr)
@@ -731,11 +733,14 @@ static int inquiry_evpd_b0(unsigned char * arr)
         return sizeof(vpdb0_data);
 }
 
+/* Block device characteristics VPD page (SBC-3) */
 static int inquiry_evpd_b1(unsigned char *arr)
 {
         memset(arr, 0, 0x3c);
         arr[0] = 0;
-        arr[1] = 1;
+        arr[1] = 1;     /* non rotating medium (e.g. solid state) */
+        arr[2] = 0;
+        arr[3] = 5;     /* less than 1.8" */
 
         return 0x3c;
 }