[PATCH 00/16] Staging: hv: Cleanup storage drivers - Phase I

[PATCH 00/16] Staging: hv: Cleanup storage drivers - Phase I

[K. Y. Srinivasan]

This is first in a series of patch-sets aimed at cleaning up the storage
drivers for Hyper-V. Before I get into the details of this patch-set, I think
it is  useful to give a brief overview of the storage related front-end
drivers currently in the tree for Linux on Hyper-V:

On the host side, Windows emulates the  standard PC hardware 
to permit hosting of fully virtualized operating systems.
To enhance disk I/O performance, we support a virtual block driver.
This block driver currently handles disks that have been setup as IDE 
disks for the guest - as specified in the guest configuration.

On the SCSI side, we emulate a SCSI HBA. Devices configured
under the SCSI controller for the guest are handled via this
emulated HBA (SCSI front-end). So, SCSI disks configured for 
the guest are handled through native SCSI upper-level drivers.
If this SCSI front-end driver is not loaded, currently, the guest
cannot see devices that have been configured as SCSI devices. 
So, while the virtual block driver described earlier could potentially
handle all block devices, the implementation choices made on the host
may not permit it. Also, the only SCSI device that can be currently
configured for the guest is a disk device.

Both the block device driver (hv_blkvsc) and the SCSI front-end
driver (hv_storvsc) communicate with the host via unique channels
that are implemented as bi-directional ring-buffers. Each 
(storage) channel carries with it enough state to uniquely
identify the device on the host side. Microsoft has chosen to
use SCSI verbs for this storage channel communication.

In this patch-set I have addressed the following issues in the Hyper-V
storage drivers (virtual block and SCSI front-end):

	1) Get rid of the inclusion of storvsc.c from blockvsc.c
	2) Cleanup storvsc.c
	3) Get rid of the file blkvsc.c
	4) Cleanup the initialization sequence for both block and 
	   SCSI front-end drivers.

Regards,

K. Y

[PATCH 01/16] Staging: hv: Add the inclusion guard for vstorage.h

[K. Y. Srinivasan]

In preparation for getting rid of the inclusion of storvsc.c from
blkvsc.c, add inclusion guard to vstorage.h

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
---
 drivers/staging/hv/vstorage.h |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/staging/hv/vstorage.h b/drivers/staging/hv/vstorage.h
index ebb4d67..83060cd 100644
--- a/drivers/staging/hv/vstorage.h
+++ b/drivers/staging/hv/vstorage.h
@@ -25,6 +25,9 @@
 /* to alert the user that structure sizes may be mismatched even though the */
 /* protocol versions match. */
 
+#ifndef _VSTORAGE_H_
+#define _VSTORAGE_H_
+
 #define REVISION_STRING(REVISION_) #REVISION_
 #define FILL_VMSTOR_REVISION(RESULT_LVALUE_)				\
 	do {								\
@@ -190,3 +193,5 @@ struct vstor_packet {
 
 /*  This is the set of flags that the vsc can set in any packets it sends */
 #define VSC_LEGAL_FLAGS		(REQUEST_COMPLETION_FLAG)
+
+#endif /* _VSTORAGE_H_ */
-- 
1.7.4.1

[PATCH 02/16] Staging: hv: Move the definition of struct storvsc_request_extension

[K. Y. Srinivasan]

In preparation for getting rid of the inclusion of storvsc.c from
blkvsc.c, move the definition of struct storvsc_request_extension
from storvsc.c to storvsc_api.h.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
---
 drivers/staging/hv/blkvsc.c      |    1 +
 drivers/staging/hv/storvsc.c     |   13 -------------
 drivers/staging/hv/storvsc_api.h |   12 ++++++++++++
 3 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/drivers/staging/hv/blkvsc.c b/drivers/staging/hv/blkvsc.c
index 7c8729b..88d6e3c 100644
--- a/drivers/staging/hv/blkvsc.c
+++ b/drivers/staging/hv/blkvsc.c
@@ -24,6 +24,7 @@
 #include <linux/mm.h>
 #include "hv_api.h"
 #include "storvsc.c"
+#include "storvsc_api.h"
 
 static const char *g_blk_driver_name = "blkvsc";
 
diff --git a/drivers/staging/hv/storvsc.c b/drivers/staging/hv/storvsc.c
index e2ad729..56f3cc9 100644
--- a/drivers/staging/hv/storvsc.c
+++ b/drivers/staging/hv/storvsc.c
@@ -33,19 +33,6 @@
 #include "channel.h"
 
 
-struct storvsc_request_extension {
-	/* LIST_ENTRY ListEntry; */
-
-	struct hv_storvsc_request *request;
-	struct hv_device *device;
-
-	/* Synchronize the request/response if needed */
-	int wait_condition;
-	wait_queue_head_t wait_event;
-
-	struct vstor_packet vstor_packet;
-};
-
 /* A storvsc device is a device object that contains a vmbus channel */
 struct storvsc_device {
 	struct hv_device *device;
diff --git a/drivers/staging/hv/storvsc_api.h b/drivers/staging/hv/storvsc_api.h
index fbf5755..629144c 100644
--- a/drivers/staging/hv/storvsc_api.h
+++ b/drivers/staging/hv/storvsc_api.h
@@ -25,6 +25,7 @@
 #ifndef _STORVSC_API_H_
 #define _STORVSC_API_H_
 
+#include "vstorage.h"
 #include "vmbus_api.h"
 
 /* Defines */
@@ -102,6 +103,17 @@ struct storvsc_device_info {
 	unsigned char target_id;
 };
 
+struct storvsc_request_extension {
+	struct hv_storvsc_request *request;
+	struct hv_device *device;
+
+	/* Synchronize the request/response if needed */
+	int wait_condition;
+	wait_queue_head_t wait_event;
+
+	struct vstor_packet vstor_packet;
+};
+
 /* Interface */
 int stor_vsc_initialize(struct hv_driver *driver);
 int stor_vsc_on_host_reset(struct hv_device *device);
-- 
1.7.4.1

[PATCH 03/16] Staging: hv: Move the definition of struct storvsc_device

[K. Y. Srinivasan]

In preparation for getting rid of the inclusion of storvsc.c from
blkvsc.c, move the definition of struct storvsc_device
from storvsc.c to storvsc_api.h.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
---
 drivers/staging/hv/storvsc.c     |   26 --------------------------
 drivers/staging/hv/storvsc_api.h |   26 ++++++++++++++++++++++++++
 2 files changed, 26 insertions(+), 26 deletions(-)

diff --git a/drivers/staging/hv/storvsc.c b/drivers/staging/hv/storvsc.c
index 56f3cc9..be1c77a 100644
--- a/drivers/staging/hv/storvsc.c
+++ b/drivers/staging/hv/storvsc.c
@@ -33,32 +33,6 @@
 #include "channel.h"
 
 
-/* A storvsc device is a device object that contains a vmbus channel */
-struct storvsc_device {
-	struct hv_device *device;
-
-	/* 0 indicates the device is being destroyed */
-	atomic_t ref_count;
-
-	atomic_t num_outstanding_req;
-
-	/*
-	 * Each unique Port/Path/Target represents 1 channel ie scsi
-	 * controller. In reality, the pathid, targetid is always 0
-	 * and the port is set by us
-	 */
-	unsigned int port_number;
-	unsigned char path_id;
-	unsigned char target_id;
-
-	/* LIST_ENTRY OutstandingRequestList; */
-	/* HANDLE OutstandingRequestLock; */
-
-	/* Used for vsc/vsp channel reset process */
-	struct storvsc_request_extension init_request;
-	struct storvsc_request_extension reset_request;
-};
-
 
 static const char *g_driver_name = "storvsc";
 
diff --git a/drivers/staging/hv/storvsc_api.h b/drivers/staging/hv/storvsc_api.h
index 629144c..2b814bd 100644
--- a/drivers/staging/hv/storvsc_api.h
+++ b/drivers/staging/hv/storvsc_api.h
@@ -114,6 +114,32 @@ struct storvsc_request_extension {
 	struct vstor_packet vstor_packet;
 };
 
+/* A storvsc device is a device object that contains a vmbus channel */
+struct storvsc_device {
+	struct hv_device *device;
+
+	/* 0 indicates the device is being destroyed */
+	atomic_t ref_count;
+
+	atomic_t num_outstanding_req;
+
+	/*
+	 * Each unique Port/Path/Target represents 1 channel ie scsi
+	 * controller. In reality, the pathid, targetid is always 0
+	 * and the port is set by us
+	 */
+	unsigned int port_number;
+	unsigned char path_id;
+	unsigned char target_id;
+
+	/* LIST_ENTRY OutstandingRequestList; */
+	/* HANDLE OutstandingRequestLock; */
+
+	/* Used for vsc/vsp channel reset process */
+	struct storvsc_request_extension init_request;
+	struct storvsc_request_extension reset_request;
+};
+
 /* Interface */
 int stor_vsc_initialize(struct hv_driver *driver);
 int stor_vsc_on_host_reset(struct hv_device *device);
-- 
1.7.4.1

[PATCH 04/16] Staging: hv: Cleanup struct storvsc_device

[K. Y. Srinivasan]

Get rid of some dated comments from struct storvsc_device.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
---
 drivers/staging/hv/storvsc_api.h |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/hv/storvsc_api.h b/drivers/staging/hv/storvsc_api.h
index 2b814bd..7f780c5 100644
--- a/drivers/staging/hv/storvsc_api.h
+++ b/drivers/staging/hv/storvsc_api.h
@@ -132,9 +132,6 @@ struct storvsc_device {
 	unsigned char path_id;
 	unsigned char target_id;
 
-	/* LIST_ENTRY OutstandingRequestList; */
-	/* HANDLE OutstandingRequestLock; */
-
 	/* Used for vsc/vsp channel reset process */
 	struct storvsc_request_extension init_request;
 	struct storvsc_request_extension reset_request;
-- 
1.7.4.1

[PATCH 05/16] Staging: hv: Get rid of the include of storvsc.c from blkvsc.c

[K. Y. Srinivasan]

Now that all the structure definitions have been moved to a header file,
get rid of the inclusion of storvsc.c from blkvsc.c.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
---
 drivers/staging/hv/Makefile      |    2 +-
 drivers/staging/hv/blkvsc.c      |    2 +-
 drivers/staging/hv/storvsc.c     |    8 ++++----
 drivers/staging/hv/storvsc_api.h |    9 +++++++++
 4 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/drivers/staging/hv/Makefile b/drivers/staging/hv/Makefile
index abeb2f7..a733154 100644
--- a/drivers/staging/hv/Makefile
+++ b/drivers/staging/hv/Makefile
@@ -9,6 +9,6 @@ hv_vmbus-y := vmbus_drv.o \
 		 hv.o connection.o channel.o \
 		 channel_mgmt.o ring_buffer.o
 hv_storvsc-y := storvsc_drv.o storvsc.o
-hv_blkvsc-y := blkvsc_drv.o blkvsc.o
+hv_blkvsc-y := blkvsc_drv.o blkvsc.o storvsc.o
 hv_netvsc-y := netvsc_drv.o netvsc.o rndis_filter.o
 hv_utils-y := hv_util.o hv_kvp.o
diff --git a/drivers/staging/hv/blkvsc.c b/drivers/staging/hv/blkvsc.c
index 88d6e3c..ebe511a 100644
--- a/drivers/staging/hv/blkvsc.c
+++ b/drivers/staging/hv/blkvsc.c
@@ -22,8 +22,8 @@
  */
 #include <linux/kernel.h>
 #include <linux/mm.h>
+#include "logging.h"
 #include "hv_api.h"
-#include "storvsc.c"
 #include "storvsc_api.h"
 
 static const char *g_blk_driver_name = "blkvsc";
diff --git a/drivers/staging/hv/storvsc.c b/drivers/staging/hv/storvsc.c
index be1c77a..c8d7ff7 100644
--- a/drivers/staging/hv/storvsc.c
+++ b/drivers/staging/hv/storvsc.c
@@ -504,7 +504,7 @@ static int stor_vsc_connect_to_vsp(struct hv_device *device)
  * stor_vsc_on_device_add - Callback when the device belonging to this driver
  * is added
  */
-static int stor_vsc_on_device_add(struct hv_device *device,
+int stor_vsc_on_device_add(struct hv_device *device,
 					void *additional_info)
 {
 	struct storvsc_device *stor_device;
@@ -553,7 +553,7 @@ cleanup:
 /*
  * stor_vsc_on_device_remove - Callback when the our device is being removed
  */
-static int stor_vsc_on_device_remove(struct hv_device *device)
+int stor_vsc_on_device_remove(struct hv_device *device)
 {
 	struct storvsc_device *stor_device;
 
@@ -646,7 +646,7 @@ cleanup:
 /*
  * stor_vsc_on_io_request - Callback to initiate an I/O request
  */
-static int stor_vsc_on_io_request(struct hv_device *device,
+int stor_vsc_on_io_request(struct hv_device *device,
 			      struct hv_storvsc_request *request)
 {
 	struct storvsc_device *stor_device;
@@ -739,7 +739,7 @@ static int stor_vsc_on_io_request(struct hv_device *device,
 /*
  * stor_vsc_on_cleanup - Perform any cleanup when the driver is removed
  */
-static void stor_vsc_on_cleanup(struct hv_driver *driver)
+void stor_vsc_on_cleanup(struct hv_driver *driver)
 {
 }
 
diff --git a/drivers/staging/hv/storvsc_api.h b/drivers/staging/hv/storvsc_api.h
index 7f780c5..141b8fd 100644
--- a/drivers/staging/hv/storvsc_api.h
+++ b/drivers/staging/hv/storvsc_api.h
@@ -142,4 +142,13 @@ int stor_vsc_initialize(struct hv_driver *driver);
 int stor_vsc_on_host_reset(struct hv_device *device);
 int blk_vsc_initialize(struct hv_driver *driver);
 
+int stor_vsc_on_device_add(struct hv_device *device,
+				void *additional_info);
+int stor_vsc_on_device_remove(struct hv_device *device);
+
+int stor_vsc_on_io_request(struct hv_device *device,
+				struct hv_storvsc_request *request);
+void stor_vsc_on_cleanup(struct hv_driver *driver);
+
+
 #endif /* _STORVSC_API_H_ */
-- 
1.7.4.1

[PATCH 06/16] Staging: hv: Get rid of dead code in storvsc.c

[K. Y. Srinivasan]

Get rid of some "dead code" from storvsc.c

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
---
 drivers/staging/hv/storvsc.c |   33 ---------------------------------
 1 files changed, 0 insertions(+), 33 deletions(-)

diff --git a/drivers/staging/hv/storvsc.c b/drivers/staging/hv/storvsc.c
index c8d7ff7..1f05aa6 100644
--- a/drivers/staging/hv/storvsc.c
+++ b/drivers/staging/hv/storvsc.c
@@ -65,7 +65,6 @@ static inline struct storvsc_device *alloc_stor_device(struct hv_device *device)
 
 static inline void free_stor_device(struct storvsc_device *device)
 {
-	/* ASSERT(atomic_read(&device->ref_count) == 0); */
 	kfree(device);
 }
 
@@ -103,10 +102,8 @@ static inline void put_stor_device(struct hv_device *device)
 	struct storvsc_device *stor_device;
 
 	stor_device = (struct storvsc_device *)device->ext;
-	/* ASSERT(stor_device); */
 
 	atomic_dec(&stor_device->ref_count);
-	/* ASSERT(atomic_read(&stor_device->ref_count)); */
 }
 
 /* Drop ref count to 1 to effectively disable get_stor_device() */
@@ -116,7 +113,6 @@ static inline struct storvsc_device *release_stor_device(
 	struct storvsc_device *stor_device;
 
 	stor_device = (struct storvsc_device *)device->ext;
-	/* ASSERT(stor_device); */
 
 	/* Busy wait until the ref drop to 2, then set it to 1 */
 	while (atomic_cmpxchg(&stor_device->ref_count, 2, 1) != 2)
@@ -132,7 +128,6 @@ static inline struct storvsc_device *final_release_stor_device(
 	struct storvsc_device *stor_device;
 
 	stor_device = (struct storvsc_device *)device->ext;
-	/* ASSERT(stor_device); */
 
 	/* Busy wait until the ref drop to 1, then set it to 0 */
 	while (atomic_cmpxchg(&stor_device->ref_count, 1, 0) != 1)
@@ -341,12 +336,8 @@ static void stor_vsc_on_io_completion(struct hv_device *device,
 		   "completed bytes xfer %u", request_ext,
 		   vstor_packet->vm_srb.data_transfer_length);
 
-	/* ASSERT(request_ext != NULL); */
-	/* ASSERT(request_ext->request != NULL); */
-
 	request = request_ext->request;
 
-	/* ASSERT(request->OnIOCompletion != NULL); */
 
 	/* Copy over the status...etc */
 	request->status = vstor_packet->vm_srb.scsi_status;
@@ -366,8 +357,6 @@ static void stor_vsc_on_io_completion(struct hv_device *device,
 				    "valid - len %d\n", request_ext,
 				    vstor_packet->vm_srb.sense_info_length);
 
-			/* ASSERT(vstor_packet->vm_srb.sense_info_length <= */
-			/* 	request->SenseBufferSize); */
 			memcpy(request->sense_buffer,
 			       vstor_packet->vm_srb.sense_data,
 			       vstor_packet->vm_srb.sense_info_length);
@@ -418,7 +407,6 @@ static void stor_vsc_on_channel_callback(void *context)
 	struct storvsc_request_extension *request;
 	int ret;
 
-	/* ASSERT(device); */
 
 	stor_device = must_get_stor_device(device);
 	if (!stor_device) {
@@ -435,21 +423,12 @@ static void stor_vsc_on_channel_callback(void *context)
 			DPRINT_DBG(STORVSC, "receive %d bytes - tid %llx",
 				   bytes_recvd, request_id);
 
-			/* ASSERT(bytes_recvd ==
-					sizeof(struct vstor_packet)); */
 
 			request = (struct storvsc_request_extension *)
 					(unsigned long)request_id;
-			/* ASSERT(request);c */
 
-			/* if (vstor_packet.Flags & SYNTHETIC_FLAG) */
 			if ((request == &stor_device->init_request) ||
 			    (request == &stor_device->reset_request)) {
-				/* DPRINT_INFO(STORVSC,
-				 *             "reset completion - operation "
-				 *             "%u status %u",
-				 *             vstor_packet.Operation,
-				 *             vstor_packet.Status); */
 
 				memcpy(&request->vstor_packet, packet,
 				       sizeof(struct vstor_packet));
@@ -461,7 +440,6 @@ static void stor_vsc_on_channel_callback(void *context)
 						request);
 			}
 		} else {
-			/* DPRINT_DBG(STORVSC, "nothing else to read..."); */
 			break;
 		}
 	} while (1);
@@ -508,7 +486,6 @@ int stor_vsc_on_device_add(struct hv_device *device,
 					void *additional_info)
 {
 	struct storvsc_device *stor_device;
-	/* struct vmstorage_channel_properties *props; */
 	struct storvsc_device_info *device_info;
 	int ret = 0;
 
@@ -520,8 +497,6 @@ int stor_vsc_on_device_add(struct hv_device *device,
 	}
 
 	/* Save the channel properties to our storvsc channel */
-	/* props = (struct vmstorage_channel_properties *)
-	 *		channel->offerMsg.Offer.u.Standard.UserDefined; */
 
 	/* FIXME: */
 	/*
@@ -530,15 +505,10 @@ int stor_vsc_on_device_add(struct hv_device *device,
 	 * scsi channel prior to the bus scan
 	 */
 
-	/* storChannel->PortNumber = 0;
-	storChannel->PathId = props->PathId;
-	storChannel->TargetId = props->TargetId; */
-
 	stor_device->port_number = device_info->port_number;
 	/* Send it back up */
 	ret = stor_vsc_connect_to_vsp(device);
 
-	/* device_info->PortNumber = stor_device->PortNumber; */
 	device_info->path_id = stor_device->path_id;
 	device_info->target_id = stor_device->target_id;
 
@@ -673,8 +643,6 @@ int stor_vsc_on_io_request(struct hv_device *device,
 		return -2;
 	}
 
-	/* print_hex_dump_bytes("", DUMP_PREFIX_NONE, request->Cdb,
-	 *			request->CdbLen); */
 
 	request_extension->request = request;
 	request_extension->device  = device;
@@ -762,7 +730,6 @@ int stor_vsc_initialize(struct hv_driver *driver)
 		   sizeof(struct vmscsi_request));
 
 	/* Make sure we are at least 2 pages since 1 page is used for control */
-	/* ASSERT(stor_driver->RingBufferSize >= (PAGE_SIZE << 1)); */
 
 	driver->name = g_driver_name;
 	memcpy(&driver->dev_type, &gStorVscDeviceType,
-- 
1.7.4.1

[PATCH 07/16] Staging: hv: Move the definition of stor_vsc_initialize()

[K. Y. Srinivasan]

Since stor_vsc_initialize() is only used in storvs_drv.c, move this
function to storvsc_drv.c.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
---
 drivers/staging/hv/storvsc.c     |   64 --------------------------------------
 drivers/staging/hv/storvsc_drv.c |   63 +++++++++++++++++++++++++++++++++++++
 2 files changed, 63 insertions(+), 64 deletions(-)

diff --git a/drivers/staging/hv/storvsc.c b/drivers/staging/hv/storvsc.c
index 1f05aa6..83d012b 100644
--- a/drivers/staging/hv/storvsc.c
+++ b/drivers/staging/hv/storvsc.c
@@ -33,18 +33,6 @@
 #include "channel.h"
 
 
-
-static const char *g_driver_name = "storvsc";
-
-/* {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f} */
-static const struct hv_guid gStorVscDeviceType = {
-	.data = {
-		0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d,
-		0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f
-	}
-};
-
-
 static inline struct storvsc_device *alloc_stor_device(struct hv_device *device)
 {
 	struct storvsc_device *stor_device;
@@ -711,55 +699,3 @@ void stor_vsc_on_cleanup(struct hv_driver *driver)
 {
 }
 
-/*
- * stor_vsc_initialize - Main entry point
- */
-int stor_vsc_initialize(struct hv_driver *driver)
-{
-	struct storvsc_driver_object *stor_driver;
-
-	stor_driver = (struct storvsc_driver_object *)driver;
-
-	DPRINT_DBG(STORVSC, "sizeof(STORVSC_REQUEST)=%zd "
-		   "sizeof(struct storvsc_request_extension)=%zd "
-		   "sizeof(struct vstor_packet)=%zd, "
-		   "sizeof(struct vmscsi_request)=%zd",
-		   sizeof(struct hv_storvsc_request),
-		   sizeof(struct storvsc_request_extension),
-		   sizeof(struct vstor_packet),
-		   sizeof(struct vmscsi_request));
-
-	/* Make sure we are at least 2 pages since 1 page is used for control */
-
-	driver->name = g_driver_name;
-	memcpy(&driver->dev_type, &gStorVscDeviceType,
-	       sizeof(struct hv_guid));
-
-	stor_driver->request_ext_size =
-			sizeof(struct storvsc_request_extension);
-
-	/*
-	 * Divide the ring buffer data size (which is 1 page less
-	 * than the ring buffer size since that page is reserved for
-	 * the ring buffer indices) by the max request size (which is
-	 * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64)
-	 */
-	stor_driver->max_outstanding_req_per_channel =
-		((stor_driver->ring_buffer_size - PAGE_SIZE) /
-		  ALIGN(MAX_MULTIPAGE_BUFFER_PACKET +
-			   sizeof(struct vstor_packet) + sizeof(u64),
-			   sizeof(u64)));
-
-	DPRINT_INFO(STORVSC, "max io %u, currently %u\n",
-		    stor_driver->max_outstanding_req_per_channel,
-		    STORVSC_MAX_IO_REQUESTS);
-
-	/* Setup the dispatch table */
-	stor_driver->base.dev_add	= stor_vsc_on_device_add;
-	stor_driver->base.dev_rm	= stor_vsc_on_device_remove;
-	stor_driver->base.cleanup	= stor_vsc_on_cleanup;
-
-	stor_driver->on_io_request	= stor_vsc_on_io_request;
-
-	return 0;
-}
diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c
index e6462a2..5ea09da 100644
--- a/drivers/staging/hv/storvsc_drv.c
+++ b/drivers/staging/hv/storvsc_drv.c
@@ -38,6 +38,16 @@
 #include "storvsc_api.h"
 
 
+static const char *g_driver_name = "storvsc";
+
+/* {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f} */
+static const struct hv_guid gStorVscDeviceType = {
+	.data = {
+		0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d,
+		0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f
+	}
+};
+
 struct host_device_context {
 	/* must be 1st field
 	 * FIXME this is a bug */
@@ -64,6 +74,59 @@ struct storvsc_cmd_request {
 };
 
 
+/*
+ * stor_vsc_initialize - Main entry point
+ */
+int stor_vsc_initialize(struct hv_driver *driver)
+{
+	struct storvsc_driver_object *stor_driver;
+
+	stor_driver = (struct storvsc_driver_object *)driver;
+
+	DPRINT_DBG(STORVSC, "sizeof(STORVSC_REQUEST)=%zd "
+		   "sizeof(struct storvsc_request_extension)=%zd "
+		   "sizeof(struct vstor_packet)=%zd, "
+		   "sizeof(struct vmscsi_request)=%zd",
+		   sizeof(struct hv_storvsc_request),
+		   sizeof(struct storvsc_request_extension),
+		   sizeof(struct vstor_packet),
+		   sizeof(struct vmscsi_request));
+
+	/* Make sure we are at least 2 pages since 1 page is used for control */
+
+	driver->name = g_driver_name;
+	memcpy(&driver->dev_type, &gStorVscDeviceType,
+	       sizeof(struct hv_guid));
+
+	stor_driver->request_ext_size =
+			sizeof(struct storvsc_request_extension);
+
+	/*
+	 * Divide the ring buffer data size (which is 1 page less
+	 * than the ring buffer size since that page is reserved for
+	 * the ring buffer indices) by the max request size (which is
+	 * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64)
+	 */
+	stor_driver->max_outstanding_req_per_channel =
+		((stor_driver->ring_buffer_size - PAGE_SIZE) /
+		  ALIGN(MAX_MULTIPAGE_BUFFER_PACKET +
+			   sizeof(struct vstor_packet) + sizeof(u64),
+			   sizeof(u64)));
+
+	DPRINT_INFO(STORVSC, "max io %u, currently %u\n",
+		    stor_driver->max_outstanding_req_per_channel,
+		    STORVSC_MAX_IO_REQUESTS);
+
+	/* Setup the dispatch table */
+	stor_driver->base.dev_add	= stor_vsc_on_device_add;
+	stor_driver->base.dev_rm	= stor_vsc_on_device_remove;
+	stor_driver->base.cleanup	= stor_vsc_on_cleanup;
+
+	stor_driver->on_io_request	= stor_vsc_on_io_request;
+
+	return 0;
+}
+
 /* Static decl */
 static int storvsc_probe(struct device *dev);
 static int storvsc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd);
-- 
1.7.4.1

[PATCH 08/16] Staging: hv: Make the function stor_vsc_initialize() static

[K. Y. Srinivasan]

Make the function  stor_vsc_initialize() a  static function.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
---
 drivers/staging/hv/storvsc_api.h |    1 -
 drivers/staging/hv/storvsc_drv.c |    2 +-
 2 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/hv/storvsc_api.h b/drivers/staging/hv/storvsc_api.h
index 141b8fd..9a452f2 100644
--- a/drivers/staging/hv/storvsc_api.h
+++ b/drivers/staging/hv/storvsc_api.h
@@ -138,7 +138,6 @@ struct storvsc_device {
 };
 
 /* Interface */
-int stor_vsc_initialize(struct hv_driver *driver);
 int stor_vsc_on_host_reset(struct hv_device *device);
 int blk_vsc_initialize(struct hv_driver *driver);
 
diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c
index 5ea09da..af6a37d 100644
--- a/drivers/staging/hv/storvsc_drv.c
+++ b/drivers/staging/hv/storvsc_drv.c
@@ -77,7 +77,7 @@ struct storvsc_cmd_request {
 /*
  * stor_vsc_initialize - Main entry point
  */
-int stor_vsc_initialize(struct hv_driver *driver)
+static int stor_vsc_initialize(struct hv_driver *driver)
 {
 	struct storvsc_driver_object *stor_driver;
 
-- 
1.7.4.1

[PATCH 09/16] Staging: hv: Cleanup the initialization of storvsc driver

[K. Y. Srinivasan]

Cleanup the initialization sequence for the storvsc driver.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
---
 drivers/staging/hv/storvsc_drv.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c
index af6a37d..2c51a07 100644
--- a/drivers/staging/hv/storvsc_drv.c
+++ b/drivers/staging/hv/storvsc_drv.c
@@ -191,7 +191,7 @@ static struct scsi_host_template scsi_driver = {
 /*
  * storvsc_drv_init - StorVsc driver initialization.
  */
-static int storvsc_drv_init(int (*drv_init)(struct hv_driver *drv))
+static int storvsc_drv_init(void)
 {
 	int ret;
 	struct storvsc_driver_object *storvsc_drv_obj = &g_storvsc_drv;
@@ -200,7 +200,7 @@ static int storvsc_drv_init(int (*drv_init)(struct hv_driver *drv))
 	storvsc_drv_obj->ring_buffer_size = storvsc_ringbuffer_size;
 
 	/* Callback to client driver to complete the initialization */
-	drv_init(&storvsc_drv_obj->base);
+	stor_vsc_initialize(&storvsc_drv_obj->base);
 
 	drv->priv = storvsc_drv_obj;
 
@@ -986,7 +986,7 @@ static int __init storvsc_init(void)
 	int ret;
 
 	DPRINT_INFO(STORVSC_DRV, "Storvsc initializing....");
-	ret = storvsc_drv_init(stor_vsc_initialize);
+	ret = storvsc_drv_init();
 	return ret;
 }
 
-- 
1.7.4.1

[PATCH 10/16] Staging: hv: Move the contents of blkvsc.c to blkvsc_drv.c

[K. Y. Srinivasan]

In preparation for getting rid of the file blkvsc.c, move its contents
to the appropriate file.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
---
 drivers/staging/hv/Makefile     |    2 +-
 drivers/staging/hv/blkvsc_drv.c |   79 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 80 insertions(+), 1 deletions(-)

diff --git a/drivers/staging/hv/Makefile b/drivers/staging/hv/Makefile
index a733154..3004674 100644
--- a/drivers/staging/hv/Makefile
+++ b/drivers/staging/hv/Makefile
@@ -9,6 +9,6 @@ hv_vmbus-y := vmbus_drv.o \
 		 hv.o connection.o channel.o \
 		 channel_mgmt.o ring_buffer.o
 hv_storvsc-y := storvsc_drv.o storvsc.o
-hv_blkvsc-y := blkvsc_drv.o blkvsc.o storvsc.o
+hv_blkvsc-y := blkvsc_drv.o  storvsc.o
 hv_netvsc-y := netvsc_drv.o netvsc.o rndis_filter.o
 hv_utils-y := hv_util.o hv_kvp.o
diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c
index 6e02f1b..1d602a1 100644
--- a/drivers/staging/hv/blkvsc_drv.c
+++ b/drivers/staging/hv/blkvsc_drv.c
@@ -116,6 +116,85 @@ struct block_device_context {
 };
 
 
+static const char *g_blk_driver_name = "blkvsc";
+
+/* {32412632-86cb-44a2-9b5c-50d1417354f5} */
+static const struct hv_guid g_blk_device_type = {
+	.data = {
+		0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
+		0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5
+	}
+};
+
+static int blk_vsc_on_device_add(struct hv_device *device,
+				void *additional_info)
+{
+	struct storvsc_device_info *device_info;
+	int ret = 0;
+
+	device_info = (struct storvsc_device_info *)additional_info;
+
+	ret = stor_vsc_on_device_add(device, additional_info);
+	if (ret != 0)
+		return ret;
+
+	/*
+	 * We need to use the device instance guid to set the path and target
+	 * id. For IDE devices, the device instance id is formatted as
+	 * <bus id> * - <device id> - 8899 - 000000000000.
+	 */
+	device_info->path_id = device->dev_instance.data[3] << 24 |
+			     device->dev_instance.data[2] << 16 |
+			     device->dev_instance.data[1] << 8  |
+			     device->dev_instance.data[0];
+
+	device_info->target_id = device->dev_instance.data[5] << 8 |
+			       device->dev_instance.data[4];
+
+	return ret;
+}
+
+
+int blk_vsc_initialize(struct hv_driver *driver)
+{
+	struct storvsc_driver_object *stor_driver;
+	int ret = 0;
+
+	stor_driver = (struct storvsc_driver_object *)driver;
+
+	/* Make sure we are at least 2 pages since 1 page is used for control */
+	/* ASSERT(stor_driver->RingBufferSize >= (PAGE_SIZE << 1)); */
+
+	driver->name = g_blk_driver_name;
+	memcpy(&driver->dev_type, &g_blk_device_type, sizeof(struct hv_guid));
+
+	stor_driver->request_ext_size =
+	sizeof(struct storvsc_request_extension);
+
+	/*
+	 * Divide the ring buffer data size (which is 1 page less than the ring
+	 * buffer size since that page is reserved for the ring buffer indices)
+	 * by the max request size (which is
+	 * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64)
+	 */
+	stor_driver->max_outstanding_req_per_channel =
+		((stor_driver->ring_buffer_size - PAGE_SIZE) /
+		  ALIGN(MAX_MULTIPAGE_BUFFER_PACKET +
+			   sizeof(struct vstor_packet) + sizeof(u64),
+			   sizeof(u64)));
+
+	DPRINT_INFO(BLKVSC, "max io outstd %u",
+		    stor_driver->max_outstanding_req_per_channel);
+
+	/* Setup the dispatch table */
+	stor_driver->base.dev_add = blk_vsc_on_device_add;
+	stor_driver->base.dev_rm = stor_vsc_on_device_remove;
+	stor_driver->base.cleanup = stor_vsc_on_cleanup;
+	stor_driver->on_io_request = stor_vsc_on_io_request;
+
+	return ret;
+}
+
 /* Static decl */
 static DEFINE_MUTEX(blkvsc_mutex);
 static int blkvsc_probe(struct device *dev);
-- 
1.7.4.1

[PATCH 11/16] Staging: hv: Get rid of the file blkvsc.c

[K. Y. Srinivasan]

Now delete the file.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
---
 drivers/staging/hv/blkvsc.c |  103 -------------------------------------------
 1 files changed, 0 insertions(+), 103 deletions(-)
 delete mode 100644 drivers/staging/hv/blkvsc.c

diff --git a/drivers/staging/hv/blkvsc.c b/drivers/staging/hv/blkvsc.c
deleted file mode 100644
index ebe511a..0000000
--- a/drivers/staging/hv/blkvsc.c
+++ /dev/null
@@ -1,103 +0,0 @@
-/*
- *
- * Copyright (c) 2009, Microsoft Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
- * Place - Suite 330, Boston, MA 02111-1307 USA.
- *
- * Authors:
- *   Haiyang Zhang <haiyangz@microsoft.com>
- *   Hank Janssen  <hjanssen@microsoft.com>
- *
- */
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include "logging.h"
-#include "hv_api.h"
-#include "storvsc_api.h"
-
-static const char *g_blk_driver_name = "blkvsc";
-
-/* {32412632-86cb-44a2-9b5c-50d1417354f5} */
-static const struct hv_guid g_blk_device_type = {
-	.data = {
-		0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
-		0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5
-	}
-};
-
-static int blk_vsc_on_device_add(struct hv_device *device, void *additional_info)
-{
-	struct storvsc_device_info *device_info;
-	int ret = 0;
-
-	device_info = (struct storvsc_device_info *)additional_info;
-
-	ret = stor_vsc_on_device_add(device, additional_info);
-	if (ret != 0)
-		return ret;
-
-	/*
-	 * We need to use the device instance guid to set the path and target
-	 * id. For IDE devices, the device instance id is formatted as
-	 * <bus id> * - <device id> - 8899 - 000000000000.
-	 */
-	device_info->path_id = device->dev_instance.data[3] << 24 |
-			     device->dev_instance.data[2] << 16 |
-			     device->dev_instance.data[1] << 8  |
-			     device->dev_instance.data[0];
-
-	device_info->target_id = device->dev_instance.data[5] << 8 |
-			       device->dev_instance.data[4];
-
-	return ret;
-}
-
-int blk_vsc_initialize(struct hv_driver *driver)
-{
-	struct storvsc_driver_object *stor_driver;
-	int ret = 0;
-
-	stor_driver = (struct storvsc_driver_object *)driver;
-
-	/* Make sure we are at least 2 pages since 1 page is used for control */
-	/* ASSERT(stor_driver->RingBufferSize >= (PAGE_SIZE << 1)); */
-
-	driver->name = g_blk_driver_name;
-	memcpy(&driver->dev_type, &g_blk_device_type, sizeof(struct hv_guid));
-
-	stor_driver->request_ext_size = sizeof(struct storvsc_request_extension);
-
-	/*
-	 * Divide the ring buffer data size (which is 1 page less than the ring
-	 * buffer size since that page is reserved for the ring buffer indices)
-	 * by the max request size (which is
-	 * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64)
-	 */
-	stor_driver->max_outstanding_req_per_channel =
-		((stor_driver->ring_buffer_size - PAGE_SIZE) /
-		  ALIGN(MAX_MULTIPAGE_BUFFER_PACKET +
-			   sizeof(struct vstor_packet) + sizeof(u64),
-			   sizeof(u64)));
-
-	DPRINT_INFO(BLKVSC, "max io outstd %u",
-		    stor_driver->max_outstanding_req_per_channel);
-
-	/* Setup the dispatch table */
-	stor_driver->base.dev_add = blk_vsc_on_device_add;
-	stor_driver->base.dev_rm = stor_vsc_on_device_remove;
-	stor_driver->base.cleanup = stor_vsc_on_cleanup;
-	stor_driver->on_io_request = stor_vsc_on_io_request;
-
-	return ret;
-}
-- 
1.7.4.1

[PATCH 12/16] Staging: hv: Cleanup initialization of blkvsc driver

[K. Y. Srinivasan]

Cleanup the initialization sequence for the block driver.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
---
 drivers/staging/hv/blkvsc_drv.c  |    8 ++++----
 drivers/staging/hv/storvsc_api.h |    1 -
 2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c
index 1d602a1..824080d 100644
--- a/drivers/staging/hv/blkvsc_drv.c
+++ b/drivers/staging/hv/blkvsc_drv.c
@@ -155,7 +155,7 @@ static int blk_vsc_on_device_add(struct hv_device *device,
 }
 
 
-int blk_vsc_initialize(struct hv_driver *driver)
+static int blk_vsc_initialize(struct hv_driver *driver)
 {
 	struct storvsc_driver_object *stor_driver;
 	int ret = 0;
@@ -243,7 +243,7 @@ static const struct block_device_operations block_ops = {
 /*
  * blkvsc_drv_init -  BlkVsc driver initialization.
  */
-static int blkvsc_drv_init(int (*drv_init)(struct hv_driver *drv))
+static int blkvsc_drv_init(void)
 {
 	struct storvsc_driver_object *storvsc_drv_obj = &g_blkvsc_drv;
 	struct hv_driver *drv = &g_blkvsc_drv.base;
@@ -254,7 +254,7 @@ static int blkvsc_drv_init(int (*drv_init)(struct hv_driver *drv))
 	drv->priv = storvsc_drv_obj;
 
 	/* Callback to client driver to complete the initialization */
-	drv_init(&storvsc_drv_obj->base);
+	blk_vsc_initialize(&storvsc_drv_obj->base);
 
 	drv->driver.name = storvsc_drv_obj->base.name;
 
@@ -1552,7 +1552,7 @@ static int __init blkvsc_init(void)
 
 	DPRINT_INFO(BLKVSC_DRV, "Blkvsc initializing....");
 
-	ret = blkvsc_drv_init(blk_vsc_initialize);
+	ret = blkvsc_drv_init();
 
 	return ret;
 }
diff --git a/drivers/staging/hv/storvsc_api.h b/drivers/staging/hv/storvsc_api.h
index 9a452f2..d985bbf 100644
--- a/drivers/staging/hv/storvsc_api.h
+++ b/drivers/staging/hv/storvsc_api.h
@@ -139,7 +139,6 @@ struct storvsc_device {
 
 /* Interface */
 int stor_vsc_on_host_reset(struct hv_device *device);
-int blk_vsc_initialize(struct hv_driver *driver);
 
 int stor_vsc_on_device_add(struct hv_device *device,
 				void *additional_info);
-- 
1.7.4.1

[PATCH 13/16] Staging: hv: Move the definition of the function get_stor_device()

[K. Y. Srinivasan]

In preparation for further cleaning up storvsc.c move the definition 
of the inline function get_stor_device() from storvsc.c to 
storvsc_api.h.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
---
 drivers/staging/hv/storvsc.c     |   14 --------------
 drivers/staging/hv/storvsc_api.h |   15 +++++++++++++++
 2 files changed, 15 insertions(+), 14 deletions(-)

diff --git a/drivers/staging/hv/storvsc.c b/drivers/staging/hv/storvsc.c
index 83d012b..357f5dd 100644
--- a/drivers/staging/hv/storvsc.c
+++ b/drivers/staging/hv/storvsc.c
@@ -56,20 +56,6 @@ static inline void free_stor_device(struct storvsc_device *device)
 	kfree(device);
 }
 
-/* Get the stordevice object iff exists and its refcount > 1 */
-static inline struct storvsc_device *get_stor_device(struct hv_device *device)
-{
-	struct storvsc_device *stor_device;
-
-	stor_device = (struct storvsc_device *)device->ext;
-	if (stor_device && atomic_read(&stor_device->ref_count) > 1)
-		atomic_inc(&stor_device->ref_count);
-	else
-		stor_device = NULL;
-
-	return stor_device;
-}
-
 /* Get the stordevice object iff exists and its refcount > 0 */
 static inline struct storvsc_device *must_get_stor_device(
 					struct hv_device *device)
diff --git a/drivers/staging/hv/storvsc_api.h b/drivers/staging/hv/storvsc_api.h
index d985bbf..4e66507 100644
--- a/drivers/staging/hv/storvsc_api.h
+++ b/drivers/staging/hv/storvsc_api.h
@@ -137,6 +137,21 @@ struct storvsc_device {
 	struct storvsc_request_extension reset_request;
 };
 
+
+/* Get the stordevice object iff exists and its refcount > 1 */
+static inline struct storvsc_device *get_stor_device(struct hv_device *device)
+{
+	struct storvsc_device *stor_device;
+
+	stor_device = (struct storvsc_device *)device->ext;
+	if (stor_device && atomic_read(&stor_device->ref_count) > 1)
+		atomic_inc(&stor_device->ref_count);
+	else
+		stor_device = NULL;
+
+	return stor_device;
+}
+
 /* Interface */
 int stor_vsc_on_host_reset(struct hv_device *device);
 
-- 
1.7.4.1

[PATCH 14/16] Staging: hv: Move the definition of the function put_stor_device()

[K. Y. Srinivasan]

In preparation for further cleaning up storvsc.c move the definition
of the inline function put_stor_device() from storvsc.c to
storvsc_api.h.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
---
 drivers/staging/hv/storvsc.c     |    9 ---------
 drivers/staging/hv/storvsc_api.h |   10 ++++++++++
 2 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/drivers/staging/hv/storvsc.c b/drivers/staging/hv/storvsc.c
index 357f5dd..c576e7b 100644
--- a/drivers/staging/hv/storvsc.c
+++ b/drivers/staging/hv/storvsc.c
@@ -71,15 +71,6 @@ static inline struct storvsc_device *must_get_stor_device(
 	return stor_device;
 }
 
-static inline void put_stor_device(struct hv_device *device)
-{
-	struct storvsc_device *stor_device;
-
-	stor_device = (struct storvsc_device *)device->ext;
-
-	atomic_dec(&stor_device->ref_count);
-}
-
 /* Drop ref count to 1 to effectively disable get_stor_device() */
 static inline struct storvsc_device *release_stor_device(
 					struct hv_device *device)
diff --git a/drivers/staging/hv/storvsc_api.h b/drivers/staging/hv/storvsc_api.h
index 4e66507..d46b4de 100644
--- a/drivers/staging/hv/storvsc_api.h
+++ b/drivers/staging/hv/storvsc_api.h
@@ -152,6 +152,16 @@ static inline struct storvsc_device *get_stor_device(struct hv_device *device)
 	return stor_device;
 }
 
+
+static inline void put_stor_device(struct hv_device *device)
+{
+	struct storvsc_device *stor_device;
+
+	stor_device = (struct storvsc_device *)device->ext;
+
+	atomic_dec(&stor_device->ref_count);
+}
+
 /* Interface */
 int stor_vsc_on_host_reset(struct hv_device *device);
 
-- 
1.7.4.1

[PATCH 15/16] Staging: hv: Move the definition of the function stor_vsc_on_host_reset()

[K. Y. Srinivasan]

stor_vsc_on_host_reset() function is only used in storvsc_drv.c.
Move this function from storvsc.c to storvsc_drv.c

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
---
 drivers/staging/hv/storvsc.c     |   56 ------------------------------------
 drivers/staging/hv/storvsc_drv.c |   59 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 59 insertions(+), 56 deletions(-)

diff --git a/drivers/staging/hv/storvsc.c b/drivers/staging/hv/storvsc.c
index c576e7b..6801e37 100644
--- a/drivers/staging/hv/storvsc.c
+++ b/drivers/staging/hv/storvsc.c
@@ -522,62 +522,6 @@ int stor_vsc_on_device_remove(struct hv_device *device)
 	return 0;
 }
 
-int stor_vsc_on_host_reset(struct hv_device *device)
-{
-	struct storvsc_device *stor_device;
-	struct storvsc_request_extension *request;
-	struct vstor_packet *vstor_packet;
-	int ret;
-
-	DPRINT_INFO(STORVSC, "resetting host adapter...");
-
-	stor_device = get_stor_device(device);
-	if (!stor_device) {
-		DPRINT_ERR(STORVSC, "unable to get stor device..."
-			   "device being destroyed?");
-		return -1;
-	}
-
-	request = &stor_device->reset_request;
-	vstor_packet = &request->vstor_packet;
-
-	init_waitqueue_head(&request->wait_event);
-
-	vstor_packet->operation = VSTOR_OPERATION_RESET_BUS;
-	vstor_packet->flags = REQUEST_COMPLETION_FLAG;
-	vstor_packet->vm_srb.path_id = stor_device->path_id;
-
-	request->wait_condition = 0;
-	ret = vmbus_sendpacket(device->channel, vstor_packet,
-			       sizeof(struct vstor_packet),
-			       (unsigned long)&stor_device->reset_request,
-			       VM_PKT_DATA_INBAND,
-			       VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
-	if (ret != 0) {
-		DPRINT_ERR(STORVSC, "Unable to send reset packet %p ret %d",
-			   vstor_packet, ret);
-		goto cleanup;
-	}
-
-	wait_event_timeout(request->wait_event, request->wait_condition,
-			msecs_to_jiffies(1000));
-	if (request->wait_condition == 0) {
-		ret = -ETIMEDOUT;
-		goto cleanup;
-	}
-
-	DPRINT_INFO(STORVSC, "host adapter reset completed");
-
-	/*
-	 * At this point, all outstanding requests in the adapter
-	 * should have been flushed out and return to us
-	 */
-
-cleanup:
-	put_stor_device(device);
-	return ret;
-}
-
 /*
  * stor_vsc_on_io_request - Callback to initiate an I/O request
  */
diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c
index 2c51a07..e0a1195 100644
--- a/drivers/staging/hv/storvsc_drv.c
+++ b/drivers/staging/hv/storvsc_drv.c
@@ -36,6 +36,8 @@
 #include "version_info.h"
 #include "vmbus.h"
 #include "storvsc_api.h"
+#include "vstorage.h"
+#include "channel.h"
 
 
 static const char *g_driver_name = "storvsc";
@@ -230,6 +232,63 @@ static int storvsc_drv_init(void)
 	return ret;
 }
 
+
+int stor_vsc_on_host_reset(struct hv_device *device)
+{
+	struct storvsc_device *stor_device;
+	struct storvsc_request_extension *request;
+	struct vstor_packet *vstor_packet;
+	int ret;
+
+	DPRINT_INFO(STORVSC, "resetting host adapter...");
+
+	stor_device = get_stor_device(device);
+	if (!stor_device) {
+		DPRINT_ERR(STORVSC, "unable to get stor device..."
+			   "device being destroyed?");
+		return -1;
+	}
+
+	request = &stor_device->reset_request;
+	vstor_packet = &request->vstor_packet;
+
+	init_waitqueue_head(&request->wait_event);
+
+	vstor_packet->operation = VSTOR_OPERATION_RESET_BUS;
+	vstor_packet->flags = REQUEST_COMPLETION_FLAG;
+	vstor_packet->vm_srb.path_id = stor_device->path_id;
+
+	request->wait_condition = 0;
+	ret = vmbus_sendpacket(device->channel, vstor_packet,
+			       sizeof(struct vstor_packet),
+			       (unsigned long)&stor_device->reset_request,
+			       VM_PKT_DATA_INBAND,
+			       VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
+	if (ret != 0) {
+		DPRINT_ERR(STORVSC, "Unable to send reset packet %p ret %d",
+			   vstor_packet, ret);
+		goto cleanup;
+	}
+
+	wait_event_timeout(request->wait_event, request->wait_condition,
+			msecs_to_jiffies(1000));
+	if (request->wait_condition == 0) {
+		ret = -ETIMEDOUT;
+		goto cleanup;
+	}
+
+	DPRINT_INFO(STORVSC, "host adapter reset completed");
+
+	/*
+	 * At this point, all outstanding requests in the adapter
+	 * should have been flushed out and return to us
+	 */
+
+cleanup:
+	put_stor_device(device);
+	return ret;
+}
+
 static int storvsc_drv_exit_cb(struct device *dev, void *data)
 {
 	struct device **curr = (struct device **)data;
-- 
1.7.4.1

[PATCH 16/16] Staging: hv: Make the function stor_vsc_on_host_reset() static

[K. Y. Srinivasan]

Make stor_vsc_on_host_reset() a static function.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
---
 drivers/staging/hv/storvsc_api.h |    1 -
 drivers/staging/hv/storvsc_drv.c |    2 +-
 2 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/hv/storvsc_api.h b/drivers/staging/hv/storvsc_api.h
index d46b4de..5f41ef6 100644
--- a/drivers/staging/hv/storvsc_api.h
+++ b/drivers/staging/hv/storvsc_api.h
@@ -163,7 +163,6 @@ static inline void put_stor_device(struct hv_device *device)
 }
 
 /* Interface */
-int stor_vsc_on_host_reset(struct hv_device *device);
 
 int stor_vsc_on_device_add(struct hv_device *device,
 				void *additional_info);
diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c
index e0a1195..127d122 100644
--- a/drivers/staging/hv/storvsc_drv.c
+++ b/drivers/staging/hv/storvsc_drv.c
@@ -233,7 +233,7 @@ static int storvsc_drv_init(void)
 }
 
 
-int stor_vsc_on_host_reset(struct hv_device *device)
+static int stor_vsc_on_host_reset(struct hv_device *device)
 {
 	struct storvsc_device *stor_device;
 	struct storvsc_request_extension *request;
-- 
1.7.4.1

Re: [PATCH 01/16] Staging: hv: Add the inclusion guard for vstorage.h

[Greg KH]

On Wed, Mar 23, 2011 at 10:50:19AM -0700, K. Y. Srinivasan wrote:
> In preparation for getting rid of the inclusion of storvsc.c from
> blkvsc.c, add inclusion guard to vstorage.h
> 
> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
> Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
> Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
> ---
>  drivers/staging/hv/vstorage.h |    5 +++++
>  1 files changed, 5 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/staging/hv/vstorage.h b/drivers/staging/hv/vstorage.h
> index ebb4d67..83060cd 100644
> --- a/drivers/staging/hv/vstorage.h
> +++ b/drivers/staging/hv/vstorage.h
> @@ -25,6 +25,9 @@
>  /* to alert the user that structure sizes may be mismatched even though the */
>  /* protocol versions match. */
>  
> +#ifndef _VSTORAGE_H_
> +#define _VSTORAGE_H_

What's with the trailing '_'?

Traditionally we've used __FOO_H for internal kernel header files.

thanks,

greg k-h

Re: [PATCH 01/16] Staging: hv: Add the inclusion guard for vstorage.h

[Greg KH]

On Mon, Apr 04, 2011 at 09:28:05PM -0700, Greg KH wrote:
> On Wed, Mar 23, 2011 at 10:50:19AM -0700, K. Y. Srinivasan wrote:
> > In preparation for getting rid of the inclusion of storvsc.c from
> > blkvsc.c, add inclusion guard to vstorage.h
> > 
> > Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
> > Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
> > Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
> > ---
> >  drivers/staging/hv/vstorage.h |    5 +++++
> >  1 files changed, 5 insertions(+), 0 deletions(-)
> > 
> > diff --git a/drivers/staging/hv/vstorage.h b/drivers/staging/hv/vstorage.h
> > index ebb4d67..83060cd 100644
> > --- a/drivers/staging/hv/vstorage.h
> > +++ b/drivers/staging/hv/vstorage.h
> > @@ -25,6 +25,9 @@
> >  /* to alert the user that structure sizes may be mismatched even though the */
> >  /* protocol versions match. */
> >  
> > +#ifndef _VSTORAGE_H_
> > +#define _VSTORAGE_H_
> 
> What's with the trailing '_'?
> 
> Traditionally we've used __FOO_H for internal kernel header files.

Oh nevermind, I see that's how the other .h files in this directory
work, it's ok for now.

thanks,

greg k-h