From: Samuel Kvasnica <bugreports@list.ims.co.at>
Subject: vscsi >2TB patch
This patch fixes current 2TB limitation of the xen vscsi driver.
Both frontend (command size) and backend (missing READ_16/WRITE_16
commands) driver need a fix. Also an scsi command added to support
ALUA. Tested thoroughly on 4TB external RAID.
I also enabled some more commands to allow operating LTO tape
drives and autoloaders (tested on HP Ultrium 1/8 + Bacula).
Still more scsi commands might be missing for other specific devices
(why not to enable all scsi commands by default ?).
This patch was tested on opensuse xenified kernels 2.6.31-2.6.34.7
in paravirtualized domU.
Signed-off-by: Samuel Kvasnica <samuel.kvasnica@ims.co.at>
Acked-by: Jan Beulich <jbeulich@novell.com>
--- a/drivers/xen/scsiback/emulate.c
+++ b/drivers/xen/scsiback/emulate.c
@@ -28,6 +28,11 @@
* IN THE SOFTWARE.
*/
+/*
+* Patched to support >2TB drives + allow tape & autoloader operations
+* 2010, Samuel Kvasnica, IMS Nanofabrication AG
+*/
+
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
@@ -384,85 +389,88 @@ void scsiback_emulation_init(void)
/*
Following commands do not require emulation.
*/
- NO_EMULATE(TEST_UNIT_READY); /*0x00*/
- NO_EMULATE(REZERO_UNIT); /*0x01*/
+ NO_EMULATE(TEST_UNIT_READY); /*0x00*/ /* sd,st */
+ NO_EMULATE(REZERO_UNIT); /*0x01*/ /* st */
NO_EMULATE(REQUEST_SENSE); /*0x03*/
NO_EMULATE(FORMAT_UNIT); /*0x04*/
- NO_EMULATE(READ_BLOCK_LIMITS); /*0x05*/
+ NO_EMULATE(READ_BLOCK_LIMITS); /*0x05*/ /* st */
/*NO_EMULATE(REASSIGN_BLOCKS); *//*0x07*/
- /*NO_EMULATE(INITIALIZE_ELEMENT_STATUS); *//*0x07*/
- NO_EMULATE(READ_6); /*0x08*/
- NO_EMULATE(WRITE_6); /*0x0a*/
- /*NO_EMULATE(SEEK_6); *//*0x0b*/
+ NO_EMULATE(INITIALIZE_ELEMENT_STATUS); /*0x07*/ /* ch */
+ NO_EMULATE(READ_6); /*0x08*/ /* sd,st */
+ NO_EMULATE(WRITE_6); /*0x0a*/ /* sd,st */
+ NO_EMULATE(SEEK_6); /*0x0b*/
/*NO_EMULATE(READ_REVERSE); *//*0x0f*/
- NO_EMULATE(WRITE_FILEMARKS); /*0x10*/
- NO_EMULATE(SPACE); /*0x11*/
+ NO_EMULATE(WRITE_FILEMARKS); /*0x10*/ /* st */
+ NO_EMULATE(SPACE); /*0x11*/ /* st */
NO_EMULATE(INQUIRY); /*0x12*/
/*NO_EMULATE(RECOVER_BUFFERED_DATA); *//*0x14*/
- /*NO_EMULATE(MODE_SELECT); *//*0x15*/
+ NO_EMULATE(MODE_SELECT); /*0x15*/ /* st */
/*NO_EMULATE(RESERVE); *//*0x16*/
/*NO_EMULATE(RELEASE); *//*0x17*/
/*NO_EMULATE(COPY); *//*0x18*/
- NO_EMULATE(ERASE); /*0x19*/
- NO_EMULATE(MODE_SENSE); /*0x1a*/
- /*NO_EMULATE(START_STOP); *//*0x1b*/
- /*NO_EMULATE(RECEIVE_DIAGNOSTIC); *//*0x1c*/
+ NO_EMULATE(ERASE); /*0x19*/ /* st */
+ NO_EMULATE(MODE_SENSE); /*0x1a*/ /* st */
+ NO_EMULATE(START_STOP); /*0x1b*/ /* sd,st */
+ NO_EMULATE(RECEIVE_DIAGNOSTIC); /*0x1c*/
NO_EMULATE(SEND_DIAGNOSTIC); /*0x1d*/
- /*NO_EMULATE(ALLOW_MEDIUM_REMOVAL); *//*0x1e*/
+ NO_EMULATE(ALLOW_MEDIUM_REMOVAL); /*0x1e*/
/*NO_EMULATE(SET_WINDOW); *//*0x24*/
- NO_EMULATE(READ_CAPACITY); /*0x25*/
- NO_EMULATE(READ_10); /*0x28*/
- NO_EMULATE(WRITE_10); /*0x2a*/
- /*NO_EMULATE(SEEK_10); *//*0x2b*/
- /*NO_EMULATE(POSITION_TO_ELEMENT); *//*0x2b*/
+ NO_EMULATE(READ_CAPACITY); /*0x25*/ /* sd */
+ NO_EMULATE(READ_10); /*0x28*/ /* sd */
+ NO_EMULATE(WRITE_10); /*0x2a*/ /* sd */
+ NO_EMULATE(SEEK_10); /*0x2b*/ /* st */
+ NO_EMULATE(POSITION_TO_ELEMENT); /*0x2b*/ /* ch */
/*NO_EMULATE(WRITE_VERIFY); *//*0x2e*/
/*NO_EMULATE(VERIFY); *//*0x2f*/
/*NO_EMULATE(SEARCH_HIGH); *//*0x30*/
/*NO_EMULATE(SEARCH_EQUAL); *//*0x31*/
/*NO_EMULATE(SEARCH_LOW); *//*0x32*/
- /*NO_EMULATE(SET_LIMITS); *//*0x33*/
- /*NO_EMULATE(PRE_FETCH); *//*0x34*/
- /*NO_EMULATE(READ_POSITION); *//*0x34*/
- /*NO_EMULATE(SYNCHRONIZE_CACHE); *//*0x35*/
- /*NO_EMULATE(LOCK_UNLOCK_CACHE); *//*0x36*/
- /*NO_EMULATE(READ_DEFECT_DATA); *//*0x37*/
- /*NO_EMULATE(MEDIUM_SCAN); *//*0x38*/
+ NO_EMULATE(SET_LIMITS); /*0x33*/
+ NO_EMULATE(PRE_FETCH); /*0x34*/ /* st! */
+ NO_EMULATE(READ_POSITION); /*0x34*/ /* st */
+ NO_EMULATE(SYNCHRONIZE_CACHE); /*0x35*/ /* sd */
+ NO_EMULATE(LOCK_UNLOCK_CACHE); /*0x36*/
+ NO_EMULATE(READ_DEFECT_DATA); /*0x37*/
+ NO_EMULATE(MEDIUM_SCAN); /*0x38*/
/*NO_EMULATE(COMPARE); *//*0x39*/
/*NO_EMULATE(COPY_VERIFY); *//*0x3a*/
- /*NO_EMULATE(WRITE_BUFFER); *//*0x3b*/
- /*NO_EMULATE(READ_BUFFER); *//*0x3c*/
+ NO_EMULATE(WRITE_BUFFER); /*0x3b*/
+ NO_EMULATE(READ_BUFFER); /*0x3c*/ /* osst */
/*NO_EMULATE(UPDATE_BLOCK); *//*0x3d*/
/*NO_EMULATE(READ_LONG); *//*0x3e*/
/*NO_EMULATE(WRITE_LONG); *//*0x3f*/
/*NO_EMULATE(CHANGE_DEFINITION); *//*0x40*/
/*NO_EMULATE(WRITE_SAME); *//*0x41*/
- /*NO_EMULATE(READ_TOC); *//*0x43*/
- /*NO_EMULATE(LOG_SELECT); *//*0x4c*/
- /*NO_EMULATE(LOG_SENSE); *//*0x4d*/
+ NO_EMULATE(READ_TOC); /*0x43*/ /* sr */
+ NO_EMULATE(LOG_SELECT); /*0x4c*/
+ NO_EMULATE(LOG_SENSE); /*0x4d*/ /* st! */
/*NO_EMULATE(MODE_SELECT_10); *//*0x55*/
/*NO_EMULATE(RESERVE_10); *//*0x56*/
/*NO_EMULATE(RELEASE_10); *//*0x57*/
- /*NO_EMULATE(MODE_SENSE_10); *//*0x5a*/
+ NO_EMULATE(MODE_SENSE_10); /*0x5a*/ /* scsi_lib */
/*NO_EMULATE(PERSISTENT_RESERVE_IN); *//*0x5e*/
/*NO_EMULATE(PERSISTENT_RESERVE_OUT); *//*0x5f*/
/* REPORT_LUNS *//*0xa0*//*Full emulaiton*/
- /*NO_EMULATE(MOVE_MEDIUM); *//*0xa5*/
- /*NO_EMULATE(EXCHANGE_MEDIUM); *//*0xa6*/
+ NO_EMULATE(MAINTENANCE_IN); /*0xa3*/ /* IFT alua */
+ NO_EMULATE(MAINTENANCE_OUT); /*0xa4*/ /* IFT alua */
+ NO_EMULATE(MOVE_MEDIUM); /*0xa5*/ /* ch */
+ NO_EMULATE(EXCHANGE_MEDIUM); /*0xa6*/ /* ch */
/*NO_EMULATE(READ_12); *//*0xa8*/
/*NO_EMULATE(WRITE_12); *//*0xaa*/
/*NO_EMULATE(WRITE_VERIFY_12); *//*0xae*/
/*NO_EMULATE(SEARCH_HIGH_12); *//*0xb0*/
/*NO_EMULATE(SEARCH_EQUAL_12); *//*0xb1*/
/*NO_EMULATE(SEARCH_LOW_12); *//*0xb2*/
- /*NO_EMULATE(READ_ELEMENT_STATUS); *//*0xb8*/
- /*NO_EMULATE(SEND_VOLUME_TAG); *//*0xb6*/
+ NO_EMULATE(READ_ELEMENT_STATUS); /*0xb8*/ /* ch */
+ NO_EMULATE(SEND_VOLUME_TAG); /*0xb6*/ /* ch */
/*NO_EMULATE(WRITE_LONG_2); *//*0xea*/
- /*NO_EMULATE(READ_16); *//*0x88*/
- /*NO_EMULATE(WRITE_16); *//*0x8a*/
- /*NO_EMULATE(VERIFY_16); *//*0x8f*/
- /*NO_EMULATE(SERVICE_ACTION_IN); *//*0x9e*/
+ NO_EMULATE(READ_16); /*0x88*/ /* sd >2TB */
+ NO_EMULATE(WRITE_16); /*0x8a*/ /* sd >2TB */
+ NO_EMULATE(VERIFY_16); /*0x8f*/
+ NO_EMULATE(SERVICE_ACTION_IN); /*0x9e*/ /* sd >2TB */
+/* st: QFA_REQUEST_BLOCK, QFA_SEEK_BLOCK might be needed ? */
/*
Following commands require emulation.
*/
--- a/drivers/xen/scsifront/scsifront.c
+++ b/drivers/xen/scsifront/scsifront.c
@@ -357,6 +357,11 @@ static int scsifront_queuecommand(struct
int ref_cnt;
uint16_t rqid;
+/* debug printk to identify more missing scsi commands
+ printk(KERN_INFO "scsicmd: len=%i,
0x%x,0x%x,0x%x,0x%x,0x%x,0x%x,0x%x,0x%x,0x%x,0x%x",sc->cmd_len,
+ sc->cmnd[0],sc->cmnd[1],sc->cmnd[2],sc->cmnd[3],sc->cmnd[4],
+ sc->cmnd[5],sc->cmnd[6],sc->cmnd[7],sc->cmnd[8],sc->cmnd[9]);
+*/
if (RING_FULL(&info->ring)) {
goto out_host_busy;
}
--- a/drivers/xen/scsifront/xenbus.c
+++ b/drivers/xen/scsifront/xenbus.c
@@ -27,7 +27,11 @@
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
-
+
+/*
+* Patched to support >2TB drives
+* 2010, Samuel Kvasnica, IMS Nanofabrication AG
+*/
#include <linux/version.h>
#include "common.h"
@@ -219,6 +223,7 @@ static int scsifront_probe(struct xenbus
host->max_channel = 0;
host->max_lun = VSCSIIF_MAX_LUN;
host->max_sectors = (VSCSIIF_SG_TABLESIZE - 1) * PAGE_SIZE / 512;
+ host->max_cmd_len = VSCSIIF_MAX_COMMAND_SIZE;
err = scsi_add_host(host, &dev->dev);
if (err) {
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