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K. Y. Srinivasan

2011-Apr-06 23:03 UTC

[RESEND][PATCH 00/22] Staging: hv: Cleanup storage drivers - Phase IV

The latest upstream merge changed struct block_device_operations:
This merge got rid of blkvsc_media_changed and introduced the
function blkvsc_check_events. This broke all the patches that
were sent after the tree was closed the last time. This is a resend of
this patch-set to account for this change in the kernel.


More cleanup. In this patch-set we deal with the following issues:

	1) While a Linux guest on Hyper-V can be assigned removable media
	   devices (DVD, floppy etc), these devices are not handled by the
	   Hyper-V block driver. So, we cleanup all the dead code
	   dealing with removable media devices.

	2) There were multiple functions to retrieve information about 
	   the device. Since much of the code in these functions were
	   identical, we have consolidated these functions into a single
	   function.

	3) Enable the ioctl code for handling HDIO_GET_IDENTITY

	4) Cleanup the code for getting the geometry.

	5) Cleanup code for retreiving device capacity; this has also fixed
	   a bug with regards to presenting physical disks to the guest
	   as an IDE disk.

	6) General cleanup: simplify blkvsc_init_rw(), get rid of 
	   unnecessary DPRINT*() calls, get rid of unnecessary code,
	   cleanup blkvsc_open().

	7) Remove all IDE details from blkvsc_drv.c.

Regards,

K. Y

K. Y. Srinivasan

2011-Apr-06 23:05 UTC

head link

[PATCH 01/22] Staging: hv: Get rid of blkvsc_check_events()

We don't support removable media in Hyper-V block driver.
Get rid of blkvsc_check_events() as it is efectively "dead code".


Signed-off-by: K. Y. Srinivasan <kys at microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz at microsoft.com>
Signed-off-by: Hank Janssen <hjanssen at microsoft.com>
---
 drivers/staging/hv/blkvsc_drv.c |    9 ---------
 1 files changed, 0 insertions(+), 9 deletions(-)

diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c
index 0b85995..3a344d2 100644
--- a/drivers/staging/hv/blkvsc_drv.c
+++ b/drivers/staging/hv/blkvsc_drv.c
@@ -252,14 +252,6 @@ static int blkvsc_submit_request(struct blkvsc_request
*blkvsc_req,
 }
 
 
-static unsigned int blkvsc_check_events(struct gendisk *gd,
-					unsigned int clearing)
-{
-	DPRINT_DBG(BLKVSC_DRV, "- enter\n");
-	return DISK_EVENT_MEDIA_CHANGE;
-}
-
-
 static int blkvsc_open(struct block_device *bdev, fmode_t mode)
 {
 	struct block_device_context *blkdev = bdev->bd_disk->private_data;
@@ -1209,7 +1201,6 @@ static const struct block_device_operations block_ops = {
 	.owner = THIS_MODULE,
 	.open = blkvsc_open,
 	.release = blkvsc_release,
-	.check_events = blkvsc_check_events,
 	.revalidate_disk = blkvsc_revalidate_disk,
 	.getgeo = blkvsc_getgeo,
 	.ioctl  = blkvsc_ioctl,
-- 
1.7.4.1

K. Y. Srinivasan

2011-Apr-06 23:05 UTC

head link

[PATCH 02/22] Staging: hv: Enable blkvsc_ioctl()

We can support HDIO_GET_IDENTITY ioctl, enable blkvsc_ioctl().

Signed-off-by: K. Y. Srinivasan <kys at microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz at microsoft.com>
Signed-off-by: Hank Janssen <hjanssen at microsoft.com>
---
 drivers/staging/hv/blkvsc_drv.c |   11 +++--------
 1 files changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c
index 3a344d2..3b47495 100644
--- a/drivers/staging/hv/blkvsc_drv.c
+++ b/drivers/staging/hv/blkvsc_drv.c
@@ -413,23 +413,18 @@ static void blkvsc_init_rw(struct blkvsc_request
*blkvsc_req)
 
 
 static int blkvsc_ioctl(struct block_device *bd, fmode_t mode,
-			unsigned cmd, unsigned long argument)
+			unsigned cmd, unsigned long arg)
 {
-	int ret;
+	struct block_device_context *blkdev = bd->bd_disk->private_data;
+	int ret = 0;
 
 	switch (cmd) {
-	/*
-	 * TODO: I think there is certain format for HDIO_GET_IDENTITY rather
-	 * than just a GUID. Commented it out for now.
-	 */
-#if 0
 	case HDIO_GET_IDENTITY:
 		DPRINT_INFO(BLKVSC_DRV, "HDIO_GET_IDENTITY\n");
 		if (copy_to_user((void __user *)arg, blkdev->device_id,
 				 blkdev->device_id_len))
 			ret = -EFAULT;
 		break;
-#endif
 	default:
 		ret = -EINVAL;
 		break;
-- 
1.7.4.1

K. Y. Srinivasan

2011-Apr-06 23:05 UTC

head link

[PATCH 03/22] Staging: hv: Simplify the code for blkvsc_getgeo()

We are making up the geometry anyway, keep it simple.

Signed-off-by: K. Y. Srinivasan <kys at microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz at microsoft.com>
Signed-off-by: Hank Janssen <hjanssen at microsoft.com>
---
 drivers/staging/hv/blkvsc_drv.c |   84 +++++---------------------------------
 1 files changed, 11 insertions(+), 73 deletions(-)

diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c
index 3b47495..f5cc522 100644
--- a/drivers/staging/hv/blkvsc_drv.c
+++ b/drivers/staging/hv/blkvsc_drv.c
@@ -278,82 +278,20 @@ static int blkvsc_open(struct block_device *bdev, fmode_t
mode)
 
 static int blkvsc_getgeo(struct block_device *bd, struct hd_geometry *hg)
 {
-	sector_t total_sectors = get_capacity(bd->bd_disk);
-	sector_t cylinder_times_heads = 0;
-	sector_t temp = 0;
+	sector_t nsect = get_capacity(bd->bd_disk);
+	sector_t cylinders = nsect;
 
-	int sectors_per_track = 0;
-	int heads = 0;
-	int cylinders = 0;
-	int rem = 0;
-
-	if (total_sectors > (65535 * 16 * 255))
-		total_sectors = (65535 * 16 * 255);
-
-	if (total_sectors >= (65535 * 16 * 63)) {
-		sectors_per_track = 255;
-		heads = 16;
-
-		cylinder_times_heads = total_sectors;
-		/* sector_div stores the quotient in cylinder_times_heads */
-		rem = sector_div(cylinder_times_heads, sectors_per_track);
-	} else {
-		sectors_per_track = 17;
-
-		cylinder_times_heads = total_sectors;
-		/* sector_div stores the quotient in cylinder_times_heads */
-		rem = sector_div(cylinder_times_heads, sectors_per_track);
-
-		temp = cylinder_times_heads + 1023;
-		/* sector_div stores the quotient in temp */
-		rem = sector_div(temp, 1024);
-
-		heads = temp;
-
-		if (heads < 4)
-			heads = 4;
-
-
-		if (cylinder_times_heads >= (heads * 1024) || (heads > 16)) {
-			sectors_per_track = 31;
-			heads = 16;
-
-			cylinder_times_heads = total_sectors;
-			/*
-			 * sector_div stores the quotient in
-			 * cylinder_times_heads
-			 */
-			rem = sector_div(cylinder_times_heads,
-					 sectors_per_track);
-		}
-
-		if (cylinder_times_heads >= (heads * 1024)) {
-			sectors_per_track = 63;
-			heads = 16;
-
-			cylinder_times_heads = total_sectors;
-			/*
-			 * sector_div stores the quotient in
-			 * cylinder_times_heads
-			 */
-			rem = sector_div(cylinder_times_heads,
-					 sectors_per_track);
-		}
-	}
-
-	temp = cylinder_times_heads;
-	/* sector_div stores the quotient in temp */
-	rem = sector_div(temp, heads);
-	cylinders = temp;
-
-	hg->heads = heads;
-	hg->sectors = sectors_per_track;
+	/*
+	 * We are making up these values; let us keep it simple.
+	 */
+	hg->heads = 0xff;
+	hg->sectors = 0x3f;
+	sector_div(cylinders, hg->heads * hg->sectors);
 	hg->cylinders = cylinders;
-
-	DPRINT_INFO(BLKVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads,
-		    sectors_per_track);
-
+	if ((sector_t)(hg->cylinders + 1) * hg->heads * hg->sectors <
nsect)
+		hg->cylinders = 0xffff;
 	return 0;
+
 }
 
 
-- 
1.7.4.1

K. Y. Srinivasan

2011-Apr-06 23:05 UTC

head link

[PATCH 04/22] Staging: hv: Introduce a common function for issuing commands to the device

There are multiple functions to either get info about the device
(INQUIRY, CAPACITY etc) or to FLUSH the device cache. The majority of the
code for these functions is identical. Introduce a common function for
doing all these operations.


Signed-off-by: K. Y. Srinivasan <kys at microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz at microsoft.com>
Signed-off-by: Hank Janssen <hjanssen at microsoft.com>
---
 drivers/staging/hv/blkvsc_drv.c |  163 ++++++++++++++++++++------------------
 1 files changed, 86 insertions(+), 77 deletions(-)

diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c
index f5cc522..9dbba3c 100644
--- a/drivers/staging/hv/blkvsc_drv.c
+++ b/drivers/staging/hv/blkvsc_drv.c
@@ -46,6 +46,10 @@ enum blkvsc_device_type {
 	DVD_TYPE,
 };
 
+enum blkvsc_op_type {
+	DO_INQUIRY,
+};
+
 /*
  * This request ties the struct request and struct
  * blkvsc_request/hv_storvsc_request together A struct request may be
@@ -394,6 +398,86 @@ static void blkvsc_cmd_completion(struct hv_storvsc_request
*request)
 	complete(&blkvsc_req->request.wait_event);
 }
 
+
+static int blkvsc_do_operation(struct block_device_context *blkdev,
+				enum blkvsc_op_type op)
+{
+	struct blkvsc_request *blkvsc_req;
+	struct page *page_buf;
+	unsigned char *buf;
+	unsigned char device_type;
+	int ret = 0;
+
+	blkvsc_req = kmem_cache_zalloc(blkdev->request_pool, GFP_KERNEL);
+	if (!blkvsc_req)
+		return -ENOMEM;
+
+	page_buf = alloc_page(GFP_KERNEL);
+	if (!page_buf) {
+		kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
+		return -ENOMEM;
+	}
+
+	init_completion(&blkvsc_req->request.wait_event);
+	blkvsc_req->dev = blkdev;
+	blkvsc_req->req = NULL;
+	blkvsc_req->write = 0;
+
+	blkvsc_req->request.data_buffer.pfn_array[0] +	page_to_pfn(page_buf);
+	blkvsc_req->request.data_buffer.offset = 0;
+
+	switch (op) {
+	case DO_INQUIRY:
+		blkvsc_req->cmnd[0] = INQUIRY;
+		blkvsc_req->cmnd[1] = 0x1;		/* Get product data */
+		blkvsc_req->cmnd[2] = 0x83;		/* mode page 83 */
+		blkvsc_req->cmnd[4] = 64;
+		blkvsc_req->cmd_len = 6;
+		blkvsc_req->request.data_buffer.len = 64;
+		break;
+
+	default:
+		ret = -EINVAL;
+		goto cleanup;
+	}
+
+	blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion);
+
+	wait_for_completion_interruptible(&blkvsc_req->request.wait_event);
+
+	buf = kmap(page_buf);
+
+	switch (op) {
+	case DO_INQUIRY:
+		device_type = buf[0] & 0x1F;
+
+		if (device_type == 0x0)
+			blkdev->device_type = HARDDISK_TYPE;
+		 else if (device_type == 0x5)
+			blkdev->device_type = DVD_TYPE;
+		 else
+			blkdev->device_type = UNKNOWN_DEV_TYPE;
+
+		blkdev->device_id_len = buf[7];
+		if (blkdev->device_id_len > 64)
+			blkdev->device_id_len = 64;
+
+		memcpy(blkdev->device_id, &buf[8], blkdev->device_id_len);
+		break;
+	}
+
+cleanup:
+
+	kunmap(page_buf);
+
+	__free_page(page_buf);
+
+	kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
+
+	return ret;
+}
+
 static int blkvsc_do_flush(struct block_device_context *blkdev)
 {
 	struct blkvsc_request *blkvsc_req;
@@ -799,82 +883,6 @@ static int blkvsc_revalidate_disk(struct gendisk *gd)
 }
 
 
-/* Do a scsi INQUIRY cmd here to get the device type (ie disk or dvd) */
-static int blkvsc_do_inquiry(struct block_device_context *blkdev)
-{
-	struct blkvsc_request *blkvsc_req;
-	struct page *page_buf;
-	unsigned char *buf;
-	unsigned char device_type;
-
-	DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_inquiry()\n");
-
-	blkvsc_req = kmem_cache_zalloc(blkdev->request_pool, GFP_KERNEL);
-	if (!blkvsc_req)
-		return -ENOMEM;
-
-	memset(blkvsc_req, 0, sizeof(struct blkvsc_request));
-	page_buf = alloc_page(GFP_KERNEL);
-	if (!page_buf) {
-		kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
-		return -ENOMEM;
-	}
-
-	init_completion(&blkvsc_req->request.wait_event);
-	blkvsc_req->dev = blkdev;
-	blkvsc_req->req = NULL;
-	blkvsc_req->write = 0;
-
-	blkvsc_req->request.data_buffer.pfn_array[0] -	page_to_pfn(page_buf);
-	blkvsc_req->request.data_buffer.offset = 0;
-	blkvsc_req->request.data_buffer.len = 64;
-
-	blkvsc_req->cmnd[0] = INQUIRY;
-	blkvsc_req->cmnd[1] = 0x1;		/* Get product data */
-	blkvsc_req->cmnd[2] = 0x83;		/* mode page 83 */
-	blkvsc_req->cmnd[4] = 64;
-	blkvsc_req->cmd_len = 6;
-
-	blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion);
-
-	DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete\n",
-		   blkvsc_req);
-
-	wait_for_completion_interruptible(&blkvsc_req->request.wait_event);
-
-	buf = kmap(page_buf);
-
-	/* be to le */
-	device_type = buf[0] & 0x1F;
-
-	if (device_type == 0x0) {
-		blkdev->device_type = HARDDISK_TYPE;
-	} else if (device_type == 0x5) {
-		blkdev->device_type = DVD_TYPE;
-	} else {
-		/* TODO: this is currently unsupported device type */
-		blkdev->device_type = UNKNOWN_DEV_TYPE;
-	}
-
-	DPRINT_DBG(BLKVSC_DRV, "device type %d\n", device_type);
-
-	blkdev->device_id_len = buf[7];
-	if (blkdev->device_id_len > 64)
-		blkdev->device_id_len = 64;
-
-	memcpy(blkdev->device_id, &buf[8], blkdev->device_id_len);
-
-	kunmap(page_buf);
-
-	__free_page(page_buf);
-
-	kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
-
-	return 0;
-}
-
-
 /*
  * We break the request into 1 or more blkvsc_requests and submit
  * them.  If we cant submit them all, we put them on the
@@ -1127,6 +1135,7 @@ static void blkvsc_request(struct request_queue *queue)
 }
 
 
+
 /* The one and only one */
 static  struct storvsc_driver_object g_blkvsc_drv;
 
@@ -1337,7 +1346,7 @@ static int blkvsc_probe(struct device *device)
 	blkdev->gd->driverfs_dev = &(blkdev->device_ctx->device);
 	sprintf(blkdev->gd->disk_name, "hd%c", 'a' + devnum);
 
-	blkvsc_do_inquiry(blkdev);
+	blkvsc_do_operation(blkdev, DO_INQUIRY);
 	if (blkdev->device_type == DVD_TYPE) {
 		set_disk_ro(blkdev->gd, 1);
 		blkdev->gd->flags |= GENHD_FL_REMOVABLE;
-- 
1.7.4.1

K. Y. Srinivasan

2011-Apr-06 23:05 UTC

head link

[PATCH 05/22] Staging: hv: Get rid of blkvsc_do_read_capacity()

Now that we have a common function for some of the operations on the device,
use that and get rid of the function blkvsc_do_read_capacity().

Signed-off-by: K. Y. Srinivasan <kys at microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz at microsoft.com>
Signed-off-by: Hank Janssen <hjanssen at microsoft.com>
---
 drivers/staging/hv/blkvsc_drv.c |  117 +++++++++++++--------------------------
 1 files changed, 39 insertions(+), 78 deletions(-)

diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c
index 9dbba3c..b2d149d 100644
--- a/drivers/staging/hv/blkvsc_drv.c
+++ b/drivers/staging/hv/blkvsc_drv.c
@@ -48,6 +48,7 @@ enum blkvsc_device_type {
 
 enum blkvsc_op_type {
 	DO_INQUIRY,
+	DO_CAPACITY,
 };
 
 /*
@@ -406,6 +407,9 @@ static int blkvsc_do_operation(struct block_device_context
*blkdev,
 	struct page *page_buf;
 	unsigned char *buf;
 	unsigned char device_type;
+	struct scsi_sense_hdr sense_hdr;
+	struct vmscsi_request *vm_srb;
+
 	int ret = 0;
 
 	blkvsc_req = kmem_cache_zalloc(blkdev->request_pool, GFP_KERNEL);
@@ -418,6 +422,7 @@ static int blkvsc_do_operation(struct block_device_context
*blkdev,
 		return -ENOMEM;
 	}
 
+	vm_srb = &blkvsc_req->request.vstor_packet.vm_srb;
 	init_completion(&blkvsc_req->request.wait_event);
 	blkvsc_req->dev = blkdev;
 	blkvsc_req->req = NULL;
@@ -437,6 +442,15 @@ static int blkvsc_do_operation(struct block_device_context
*blkdev,
 		blkvsc_req->request.data_buffer.len = 64;
 		break;
 
+	case DO_CAPACITY:
+		blkdev->sector_size = 0;
+		blkdev->capacity = 0;
+		blkdev->media_not_present = 0; /* assume a disk is present */
+
+		blkvsc_req->cmnd[0] = READ_CAPACITY;
+		blkvsc_req->cmd_len = 16;
+		blkvsc_req->request.data_buffer.len = 8;
+		break;
 	default:
 		ret = -EINVAL;
 		goto cleanup;
@@ -446,6 +460,18 @@ static int blkvsc_do_operation(struct block_device_context
*blkdev,
 
 	wait_for_completion_interruptible(&blkvsc_req->request.wait_event);
 
+	/* check error */
+	if (vm_srb->scsi_status) {
+		scsi_normalize_sense(blkvsc_req->sense_buffer,
+				     SCSI_SENSE_BUFFERSIZE, &sense_hdr);
+
+		if (sense_hdr.asc == 0x3A)
+			/* Medium not present */
+			blkdev->media_not_present = 1;
+
+		return 0;
+	}
+
 	buf = kmap(page_buf);
 
 	switch (op) {
@@ -465,6 +491,17 @@ static int blkvsc_do_operation(struct block_device_context
*blkdev,
 
 		memcpy(blkdev->device_id, &buf[8], blkdev->device_id_len);
 		break;
+
+	case DO_CAPACITY:
+		/* be to le */
+		blkdev->capacity +		((buf[0] << 24) | (buf[1] << 16) |
+		(buf[2] << 8) | buf[3]) + 1;
+
+		blkdev->sector_size +		(buf[4] << 24) | (buf[5] << 16) |
+		(buf[6] << 8) | buf[7];
+		break;
 	}
 
 cleanup:
@@ -715,82 +752,6 @@ static int blkvsc_release(struct gendisk *disk, fmode_t
mode)
 }
 
 
-/* Do a scsi READ_CAPACITY cmd here to get the size of the disk */
-static int blkvsc_do_read_capacity(struct block_device_context *blkdev)
-{
-	struct blkvsc_request *blkvsc_req;
-	struct page *page_buf;
-	unsigned char *buf;
-	struct scsi_sense_hdr sense_hdr;
-	struct vmscsi_request *vm_srb;
-
-	DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_read_capacity()\n");
-
-	blkdev->sector_size = 0;
-	blkdev->capacity = 0;
-	blkdev->media_not_present = 0; /* assume a disk is present */
-
-	blkvsc_req = kmem_cache_zalloc(blkdev->request_pool, GFP_KERNEL);
-	if (!blkvsc_req)
-		return -ENOMEM;
-
-	memset(blkvsc_req, 0, sizeof(struct blkvsc_request));
-	page_buf = alloc_page(GFP_KERNEL);
-	if (!page_buf) {
-		kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
-		return -ENOMEM;
-	}
-
-	vm_srb = &blkvsc_req->request.vstor_packet.vm_srb;
-	init_completion(&blkvsc_req->request.wait_event);
-	blkvsc_req->dev = blkdev;
-	blkvsc_req->req = NULL;
-	blkvsc_req->write = 0;
-
-	blkvsc_req->request.data_buffer.pfn_array[0] -	page_to_pfn(page_buf);
-	blkvsc_req->request.data_buffer.offset = 0;
-	blkvsc_req->request.data_buffer.len = 8;
-
-	blkvsc_req->cmnd[0] = READ_CAPACITY;
-	blkvsc_req->cmd_len = 16;
-
-	blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion);
-
-	DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete\n",
-		   blkvsc_req);
-
-	wait_for_completion_interruptible(&blkvsc_req->request.wait_event);
-
-	/* check error */
-	if (vm_srb->scsi_status) {
-		scsi_normalize_sense(blkvsc_req->sense_buffer,
-				     SCSI_SENSE_BUFFERSIZE, &sense_hdr);
-
-		if (sense_hdr.asc == 0x3A) {
-			/* Medium not present */
-			blkdev->media_not_present = 1;
-		}
-		return 0;
-	}
-	buf = kmap(page_buf);
-
-	/* be to le */
-	blkdev->capacity = ((buf[0] << 24) | (buf[1] << 16) |
-			    (buf[2] << 8) | buf[3]) + 1;
-	blkdev->sector_size = (buf[4] << 24) | (buf[5] << 16) |
-			      (buf[6] << 8) | buf[7];
-
-	kunmap(page_buf);
-
-	__free_page(page_buf);
-
-	kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
-
-	return 0;
-}
-
-
 static int blkvsc_do_read_capacity16(struct block_device_context *blkdev)
 {
 	struct blkvsc_request *blkvsc_req;
@@ -874,7 +835,7 @@ static int blkvsc_revalidate_disk(struct gendisk *gd)
 	DPRINT_DBG(BLKVSC_DRV, "- enter\n");
 
 	if (blkdev->device_type == DVD_TYPE) {
-		blkvsc_do_read_capacity(blkdev);
+		blkvsc_do_operation(blkdev, DO_CAPACITY);
 		set_capacity(blkdev->gd, blkdev->capacity *
 			    (blkdev->sector_size/512));
 		blk_queue_logical_block_size(gd->queue, blkdev->sector_size);
@@ -1350,7 +1311,7 @@ static int blkvsc_probe(struct device *device)
 	if (blkdev->device_type == DVD_TYPE) {
 		set_disk_ro(blkdev->gd, 1);
 		blkdev->gd->flags |= GENHD_FL_REMOVABLE;
-		blkvsc_do_read_capacity(blkdev);
+		blkvsc_do_operation(blkdev, DO_CAPACITY);
 	} else {
 		blkvsc_do_read_capacity16(blkdev);
 	}
-- 
1.7.4.1

K. Y. Srinivasan

2011-Apr-06 23:05 UTC

head link

[PATCH 06/22] Staging: hv: Get rid of blkvsc_do_read_capacity16()

Get rid of blkvsc_do_read_capacity16() and instead use the common function
for retrieving capacity.

Signed-off-by: K. Y. Srinivasan <kys at microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz at microsoft.com>
Signed-off-by: Hank Janssen <hjanssen at microsoft.com>
---
 drivers/staging/hv/blkvsc_drv.c |   81 +--------------------------------------
 1 files changed, 2 insertions(+), 79 deletions(-)

diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c
index b2d149d..7fab3c7 100644
--- a/drivers/staging/hv/blkvsc_drv.c
+++ b/drivers/staging/hv/blkvsc_drv.c
@@ -752,82 +752,6 @@ static int blkvsc_release(struct gendisk *disk, fmode_t
mode)
 }
 
 
-static int blkvsc_do_read_capacity16(struct block_device_context *blkdev)
-{
-	struct blkvsc_request *blkvsc_req;
-	struct page *page_buf;
-	unsigned char *buf;
-	struct scsi_sense_hdr sense_hdr;
-	struct vmscsi_request *vm_srb;
-
-	DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_read_capacity16()\n");
-
-	blkdev->sector_size = 0;
-	blkdev->capacity = 0;
-	blkdev->media_not_present = 0; /* assume a disk is present */
-
-	blkvsc_req = kmem_cache_zalloc(blkdev->request_pool, GFP_KERNEL);
-	if (!blkvsc_req)
-		return -ENOMEM;
-
-	memset(blkvsc_req, 0, sizeof(struct blkvsc_request));
-	vm_srb = &blkvsc_req->request.vstor_packet.vm_srb;
-	page_buf = alloc_page(GFP_KERNEL);
-	if (!page_buf) {
-		kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
-		return -ENOMEM;
-	}
-
-	init_completion(&blkvsc_req->request.wait_event);
-	blkvsc_req->dev = blkdev;
-	blkvsc_req->req = NULL;
-	blkvsc_req->write = 0;
-
-	blkvsc_req->request.data_buffer.pfn_array[0] -	page_to_pfn(page_buf);
-	blkvsc_req->request.data_buffer.offset = 0;
-	blkvsc_req->request.data_buffer.len = 12;
-
-	blkvsc_req->cmnd[0] = 0x9E; /* READ_CAPACITY16; */
-	blkvsc_req->cmd_len = 16;
-
-	/*
-	 * Set this here since the completion routine may be invoked
-	 * and completed before we return
-	 */
-
-	blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion);
-
-	DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete\n",
-		   blkvsc_req);
-
-	wait_for_completion_interruptible(&blkvsc_req->request.wait_event);
-
-	/* check error */
-	if (vm_srb->scsi_status) {
-		scsi_normalize_sense(blkvsc_req->sense_buffer,
-				     SCSI_SENSE_BUFFERSIZE, &sense_hdr);
-		if (sense_hdr.asc == 0x3A) {
-			/* Medium not present */
-			blkdev->media_not_present = 1;
-		}
-		return 0;
-	}
-	buf = kmap(page_buf);
-
-	/* be to le */
-	blkdev->capacity = be64_to_cpu(*(unsigned long long *) &buf[0]) + 1;
-	blkdev->sector_size = be32_to_cpu(*(unsigned int *)&buf[8]);
-
-	kunmap(page_buf);
-
-	__free_page(page_buf);
-
-	kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
-
-	return 0;
-}
-
 static int blkvsc_revalidate_disk(struct gendisk *gd)
 {
 	struct block_device_context *blkdev = gd->private_data;
@@ -1312,9 +1236,8 @@ static int blkvsc_probe(struct device *device)
 		set_disk_ro(blkdev->gd, 1);
 		blkdev->gd->flags |= GENHD_FL_REMOVABLE;
 		blkvsc_do_operation(blkdev, DO_CAPACITY);
-	} else {
-		blkvsc_do_read_capacity16(blkdev);
-	}
+	} else
+		blkvsc_do_operation(blkdev, DO_CAPACITY);
 
 	set_capacity(blkdev->gd, blkdev->capacity *
(blkdev->sector_size/512));
 	blk_queue_logical_block_size(blkdev->gd->queue, blkdev->sector_size);
-- 
1.7.4.1

K. Y. Srinivasan

2011-Apr-06 23:05 UTC

head link

[PATCH 07/22] Staging: hv: Get rid of the function blkvsc_do_flush()

Get rid of the function blkvsc_do_flush() and instead use the common function
to force a device flush.

Signed-off-by: K. Y. Srinivasan <kys at microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz at microsoft.com>
Signed-off-by: Hank Janssen <hjanssen at microsoft.com>
---
 drivers/staging/hv/blkvsc_drv.c |   52 ++++++++++----------------------------
 1 files changed, 14 insertions(+), 38 deletions(-)

diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c
index 7fab3c7..a7ae437 100644
--- a/drivers/staging/hv/blkvsc_drv.c
+++ b/drivers/staging/hv/blkvsc_drv.c
@@ -49,6 +49,7 @@ enum blkvsc_device_type {
 enum blkvsc_op_type {
 	DO_INQUIRY,
 	DO_CAPACITY,
+	DO_FLUSH,
 };
 
 /*
@@ -451,6 +452,13 @@ static int blkvsc_do_operation(struct block_device_context
*blkdev,
 		blkvsc_req->cmd_len = 16;
 		blkvsc_req->request.data_buffer.len = 8;
 		break;
+
+	case DO_FLUSH:
+		blkvsc_req->cmnd[0] = SYNCHRONIZE_CACHE;
+		blkvsc_req->cmd_len = 10;
+		blkvsc_req->request.data_buffer.pfn_array[0] = 0;
+		blkvsc_req->request.data_buffer.len = 0;
+		break;
 	default:
 		ret = -EINVAL;
 		goto cleanup;
@@ -502,6 +510,9 @@ static int blkvsc_do_operation(struct block_device_context
*blkdev,
 		(buf[4] << 24) | (buf[5] << 16) |
 		(buf[6] << 8) | buf[7];
 		break;
+	default:
+		break;
+
 	}
 
 cleanup:
@@ -515,41 +526,6 @@ cleanup:
 	return ret;
 }
 
-static int blkvsc_do_flush(struct block_device_context *blkdev)
-{
-	struct blkvsc_request *blkvsc_req;
-
-	DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_flush()\n");
-
-	if (blkdev->device_type != HARDDISK_TYPE)
-		return 0;
-
-	blkvsc_req = kmem_cache_zalloc(blkdev->request_pool, GFP_KERNEL);
-	if (!blkvsc_req)
-		return -ENOMEM;
-
-	memset(blkvsc_req, 0, sizeof(struct blkvsc_request));
-	init_completion(&blkvsc_req->request.wait_event);
-	blkvsc_req->dev = blkdev;
-	blkvsc_req->req = NULL;
-	blkvsc_req->write = 0;
-
-	blkvsc_req->request.data_buffer.pfn_array[0] = 0;
-	blkvsc_req->request.data_buffer.offset = 0;
-	blkvsc_req->request.data_buffer.len = 0;
-
-	blkvsc_req->cmnd[0] = SYNCHRONIZE_CACHE;
-	blkvsc_req->cmd_len = 10;
-
-	blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion);
-
-	wait_for_completion_interruptible(&blkvsc_req->request.wait_event);
-
-	kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
-
-	return 0;
-}
-
 
 static int blkvsc_cancel_pending_reqs(struct block_device_context *blkdev)
 {
@@ -676,7 +652,7 @@ static int blkvsc_remove(struct device *device)
 		udelay(100);
 	}
 
-	blkvsc_do_flush(blkdev);
+	blkvsc_do_operation(blkdev, DO_FLUSH);
 
 	spin_lock_irqsave(&blkdev->lock, flags);
 
@@ -720,7 +696,7 @@ static void blkvsc_shutdown(struct device *device)
 		udelay(100);
 	}
 
-	blkvsc_do_flush(blkdev);
+	blkvsc_do_operation(blkdev, DO_FLUSH);
 
 	spin_lock_irqsave(&blkdev->lock, flags);
 
@@ -740,7 +716,7 @@ static int blkvsc_release(struct gendisk *disk, fmode_t
mode)
 	spin_lock(&blkdev->lock);
 	if (blkdev->users == 1) {
 		spin_unlock(&blkdev->lock);
-		blkvsc_do_flush(blkdev);
+		blkvsc_do_operation(blkdev, DO_FLUSH);
 		spin_lock(&blkdev->lock);
 	}
 
-- 
1.7.4.1

K. Y. Srinivasan

2011-Apr-06 23:05 UTC

head link

[PATCH 08/22] Staging: hv: Get rid of the state media_not_present

The block driver in Hyper-V does not handle removable media, get rid of the
media_not_present state.

Signed-off-by: K. Y. Srinivasan <kys at microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz at microsoft.com>
Signed-off-by: Hank Janssen <hjanssen at microsoft.com>
---
 drivers/staging/hv/blkvsc_drv.c |    9 +--------
 1 files changed, 1 insertions(+), 8 deletions(-)

diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c
index a7ae437..4c248b7 100644
--- a/drivers/staging/hv/blkvsc_drv.c
+++ b/drivers/staging/hv/blkvsc_drv.c
@@ -103,7 +103,6 @@ struct block_device_context {
 	unsigned int device_id_len;
 	int num_outstanding_reqs;
 	int shutting_down;
-	int media_not_present;
 	unsigned int sector_size;
 	sector_t capacity;
 	unsigned int port;
@@ -446,7 +445,6 @@ static int blkvsc_do_operation(struct block_device_context
*blkdev,
 	case DO_CAPACITY:
 		blkdev->sector_size = 0;
 		blkdev->capacity = 0;
-		blkdev->media_not_present = 0; /* assume a disk is present */
 
 		blkvsc_req->cmnd[0] = READ_CAPACITY;
 		blkvsc_req->cmd_len = 16;
@@ -473,10 +471,6 @@ static int blkvsc_do_operation(struct block_device_context
*blkdev,
 		scsi_normalize_sense(blkvsc_req->sense_buffer,
 				     SCSI_SENSE_BUFFERSIZE, &sense_hdr);
 
-		if (sense_hdr.asc == 0x3A)
-			/* Medium not present */
-			blkdev->media_not_present = 1;
-
 		return 0;
 	}
 
@@ -964,8 +958,7 @@ static void blkvsc_request(struct request_queue *queue)
 		DPRINT_DBG(BLKVSC_DRV, "- req %p\n", req);
 
 		blkdev = req->rq_disk->private_data;
-		if (blkdev->shutting_down || req->cmd_type != REQ_TYPE_FS ||
-		    blkdev->media_not_present) {
+		if (blkdev->shutting_down || req->cmd_type != REQ_TYPE_FS) {
 			__blk_end_request_cur(req, 0);
 			continue;
 		}
-- 
1.7.4.1

K. Y. Srinivasan

2011-Apr-06 23:05 UTC

head link

[PATCH 09/22] Staging: hv: Get rid of the function blkvsc_revalidate_disk()

The block driver in Hyper-V does not support removable media, get rid of the
blkvsc_revalidate_disk().

Signed-off-by: K. Y. Srinivasan <kys at microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz at microsoft.com>
Signed-off-by: Hank Janssen <hjanssen at microsoft.com>
---
 drivers/staging/hv/blkvsc_drv.c |   17 -----------------
 1 files changed, 0 insertions(+), 17 deletions(-)

diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c
index 4c248b7..b2cd04a 100644
--- a/drivers/staging/hv/blkvsc_drv.c
+++ b/drivers/staging/hv/blkvsc_drv.c
@@ -722,22 +722,6 @@ static int blkvsc_release(struct gendisk *disk, fmode_t
mode)
 }
 
 
-static int blkvsc_revalidate_disk(struct gendisk *gd)
-{
-	struct block_device_context *blkdev = gd->private_data;
-
-	DPRINT_DBG(BLKVSC_DRV, "- enter\n");
-
-	if (blkdev->device_type == DVD_TYPE) {
-		blkvsc_do_operation(blkdev, DO_CAPACITY);
-		set_capacity(blkdev->gd, blkdev->capacity *
-			    (blkdev->sector_size/512));
-		blk_queue_logical_block_size(gd->queue, blkdev->sector_size);
-	}
-	return 0;
-}
-
-
 /*
  * We break the request into 1 or more blkvsc_requests and submit
  * them.  If we cant submit them all, we put them on the
@@ -997,7 +981,6 @@ static const struct block_device_operations block_ops = {
 	.owner = THIS_MODULE,
 	.open = blkvsc_open,
 	.release = blkvsc_release,
-	.revalidate_disk = blkvsc_revalidate_disk,
 	.getgeo = blkvsc_getgeo,
 	.ioctl  = blkvsc_ioctl,
 };
-- 
1.7.4.1

K. Y. Srinivasan

2011-Apr-06 23:05 UTC

head link

[PATCH 10/22] Staging: hv: Simplify blkvsc_init_rw()

Simplyfify blkvsc_init_rw() by using a single scsi command independent of
the start sector.

Signed-off-by: K. Y. Srinivasan <kys at microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz at microsoft.com>
Signed-off-by: Hank Janssen <hjanssen at microsoft.com>
---
 drivers/staging/hv/blkvsc_drv.c |   58 +++++++++------------------------------
 1 files changed, 13 insertions(+), 45 deletions(-)

diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c
index b2cd04a..5cf82f0 100644
--- a/drivers/staging/hv/blkvsc_drv.c
+++ b/drivers/staging/hv/blkvsc_drv.c
@@ -305,53 +305,21 @@ static void blkvsc_init_rw(struct blkvsc_request
*blkvsc_req)
 
 	blkvsc_req->cmd_len = 16;
 
-	if (blkvsc_req->sector_start > 0xffffffff) {
-		if (rq_data_dir(blkvsc_req->req)) {
-			blkvsc_req->write = 1;
-			blkvsc_req->cmnd[0] = WRITE_16;
-		} else {
-			blkvsc_req->write = 0;
-			blkvsc_req->cmnd[0] = READ_16;
-		}
-
-		blkvsc_req->cmnd[1] |-			(blkvsc_req->req->cmd_flags & REQ_FUA)
? 0x8 : 0;
-
-		*(unsigned long long *)&blkvsc_req->cmnd[2] -			
cpu_to_be64(blkvsc_req->sector_start);
-		*(unsigned int *)&blkvsc_req->cmnd[10] -			
cpu_to_be32(blkvsc_req->sector_count);
-	} else if ((blkvsc_req->sector_count > 0xff) ||
-		   (blkvsc_req->sector_start > 0x1fffff)) {
-		if (rq_data_dir(blkvsc_req->req)) {
-			blkvsc_req->write = 1;
-			blkvsc_req->cmnd[0] = WRITE_10;
-		} else {
-			blkvsc_req->write = 0;
-			blkvsc_req->cmnd[0] = READ_10;
-		}
-
-		blkvsc_req->cmnd[1] |-			(blkvsc_req->req->cmd_flags & REQ_FUA)
? 0x8 : 0;
-
-		*(unsigned int *)&blkvsc_req->cmnd[2] -			
cpu_to_be32(blkvsc_req->sector_start);
-		*(unsigned short *)&blkvsc_req->cmnd[7] -			
cpu_to_be16(blkvsc_req->sector_count);
+	if (rq_data_dir(blkvsc_req->req)) {
+		blkvsc_req->write = 1;
+		blkvsc_req->cmnd[0] = WRITE_16;
 	} else {
-		if (rq_data_dir(blkvsc_req->req)) {
-			blkvsc_req->write = 1;
-			blkvsc_req->cmnd[0] = WRITE_6;
-		} else {
-			blkvsc_req->write = 0;
-			blkvsc_req->cmnd[0] = READ_6;
-		}
-
-		*(unsigned int *)&blkvsc_req->cmnd[1] -			
cpu_to_be32(blkvsc_req->sector_start) >> 8;
-		blkvsc_req->cmnd[1] &= 0x1f;
-		blkvsc_req->cmnd[4] = (unsigned char)blkvsc_req->sector_count;
+		blkvsc_req->write = 0;
+		blkvsc_req->cmnd[0] = READ_16;
 	}
+
+	blkvsc_req->cmnd[1] |+	(blkvsc_req->req->cmd_flags & REQ_FUA) ?
0x8 : 0;
+
+	*(unsigned long long *)&blkvsc_req->cmnd[2] +
cpu_to_be64(blkvsc_req->sector_start);
+	*(unsigned int *)&blkvsc_req->cmnd[10] +
cpu_to_be32(blkvsc_req->sector_count);
 }
 
 
-- 
1.7.4.1

K. Y. Srinivasan

2011-Apr-06 23:05 UTC

head link

[PATCH 11/22] Staging: hv: Get rid of some DPRINT_INFO() statements

Get rid of some of the DPRINT_INFO() statements.

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

diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c
index 5cf82f0..09633cc 100644
--- a/drivers/staging/hv/blkvsc_drv.c
+++ b/drivers/staging/hv/blkvsc_drv.c
@@ -331,7 +331,6 @@ static int blkvsc_ioctl(struct block_device *bd, fmode_t
mode,
 
 	switch (cmd) {
 	case HDIO_GET_IDENTITY:
-		DPRINT_INFO(BLKVSC_DRV, "HDIO_GET_IDENTITY\n");
 		if (copy_to_user((void __user *)arg, blkdev->device_id,
 				 blkdev->device_id_len))
 			ret = -EFAULT;
@@ -1264,8 +1263,6 @@ static int __init blkvsc_init(void)
 
 	BUILD_BUG_ON(sizeof(sector_t) != 8);
 
-	DPRINT_INFO(BLKVSC_DRV, "Blkvsc initializing....");
-
 	ret = blkvsc_drv_init();
 
 	return ret;
-- 
1.7.4.1

K. Y. Srinivasan

2011-Apr-06 23:05 UTC

head link

[PATCH 12/22] Staging: hv: Get rid of some DPRINT_DBG() calls

Get rid of some of the DPRINT_DBG() statements.

Signed-off-by: K. Y. Srinivasan <kys at microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz at microsoft.com>
Signed-off-by: Hank Janssen <hjanssen at microsoft.com>
---
 drivers/staging/hv/blkvsc_drv.c |   84 ---------------------------------------
 1 files changed, 0 insertions(+), 84 deletions(-)

diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c
index 09633cc..58d4a2d 100644
--- a/drivers/staging/hv/blkvsc_drv.c
+++ b/drivers/staging/hv/blkvsc_drv.c
@@ -220,14 +220,6 @@ static int blkvsc_submit_request(struct blkvsc_request
*blkvsc_req,
 	struct vmscsi_request *vm_srb;
 	int ret;
 
-	DPRINT_DBG(BLKVSC_DRV, "blkvsc_submit_request() - "
-		   "req %p type %s start_sector %lu count %ld offset %d "
-		   "len %d\n", blkvsc_req,
-		   (blkvsc_req->write) ? "WRITE" : "READ",
-		   (unsigned long) blkvsc_req->sector_start,
-		   blkvsc_req->sector_count,
-		   blkvsc_req->request.data_buffer.offset,
-		   blkvsc_req->request.data_buffer.len);
 
 	storvsc_req = &blkvsc_req->request;
 	vm_srb = &storvsc_req->vstor_packet.vm_srb;
@@ -261,8 +253,6 @@ static int blkvsc_open(struct block_device *bdev, fmode_t
mode)
 {
 	struct block_device_context *blkdev = bdev->bd_disk->private_data;
 
-	DPRINT_DBG(BLKVSC_DRV, "- users %d disk %s\n", blkdev->users,
-		   blkdev->gd->disk_name);
 
 	mutex_lock(&blkvsc_mutex);
 	spin_lock(&blkdev->lock);
@@ -352,8 +342,6 @@ static void blkvsc_cmd_completion(struct hv_storvsc_request
*request)
 	struct scsi_sense_hdr sense_hdr;
 	struct vmscsi_request *vm_srb;
 
-	DPRINT_DBG(BLKVSC_DRV, "blkvsc_cmd_completion() - req %p\n",
-		   blkvsc_req);
 
 	vm_srb = &blkvsc_req->request.vstor_packet.vm_srb;
 	blkdev->num_outstanding_reqs--;
@@ -496,7 +484,6 @@ static int blkvsc_cancel_pending_reqs(struct
block_device_context *blkdev)
 
 	int ret = 0;
 
-	DPRINT_DBG(BLKVSC_DRV, "blkvsc_cancel_pending_reqs()");
 
 	/* Flush the pending list first */
 	list_for_each_entry_safe(pend_req, tmp, &blkdev->pending_list,
@@ -509,11 +496,6 @@ static int blkvsc_cancel_pending_reqs(struct
block_device_context *blkdev)
 		list_for_each_entry_safe(comp_req, tmp2,
 					 &pend_req->group->blkvsc_req_list,
 					 req_entry) {
-			DPRINT_DBG(BLKVSC_DRV, "completing blkvsc_req %p "
-				   "sect_start %lu sect_count %ld\n",
-				   comp_req,
-				   (unsigned long) comp_req->sector_start,
-				   comp_req->sector_count);
 
 			if (comp_req == pend_req)
 				break;
@@ -537,9 +519,6 @@ static int blkvsc_cancel_pending_reqs(struct
block_device_context *blkdev)
 			kmem_cache_free(blkdev->request_pool, comp_req);
 		}
 
-		DPRINT_DBG(BLKVSC_DRV, "cancelling pending request - %p\n",
-			   pend_req);
-
 		list_del(&pend_req->pend_entry);
 
 		list_del(&pend_req->req_entry);
@@ -552,9 +531,6 @@ static int blkvsc_cancel_pending_reqs(struct
block_device_context *blkdev)
 				 * All the sectors have been xferred ie the
 				 * request is done
 				 */
-				DPRINT_DBG(BLKVSC_DRV,
-					   "blkvsc_cancel_pending_reqs() - "
-					   "req %p COMPLETED\n", pend_req->req);
 				kmem_cache_free(blkdev->request_pool,
 						pend_req->group);
 			}
@@ -582,7 +558,6 @@ static int blkvsc_remove(struct device *device)
 	unsigned long flags;
 	int ret;
 
-	DPRINT_DBG(BLKVSC_DRV, "blkvsc_remove()\n");
 
 	if (!storvsc_drv_obj->base.dev_rm)
 		return -1;
@@ -640,9 +615,6 @@ static void blkvsc_shutdown(struct device *device)
 	if (!blkdev)
 		return;
 
-	DPRINT_DBG(BLKVSC_DRV, "blkvsc_shutdown - users %d disk %s\n",
-		   blkdev->users, blkdev->gd->disk_name);
-
 	spin_lock_irqsave(&blkdev->lock, flags);
 
 	blkdev->shutting_down = 1;
@@ -670,9 +642,6 @@ static int blkvsc_release(struct gendisk *disk, fmode_t
mode)
 {
 	struct block_device_context *blkdev = disk->private_data;
 
-	DPRINT_DBG(BLKVSC_DRV, "- users %d disk %s\n", blkdev->users,
-		   blkdev->gd->disk_name);
-
 	mutex_lock(&blkvsc_mutex);
 	spin_lock(&blkdev->lock);
 	if (blkdev->users == 1) {
@@ -710,9 +679,6 @@ static int blkvsc_do_request(struct block_device_context
*blkdev,
 	int pending = 0;
 	struct blkvsc_request_group *group = NULL;
 
-	DPRINT_DBG(BLKVSC_DRV, "blkdev %p req %p sect %lu\n", blkdev, req,
-		  (unsigned long)blk_rq_pos(req));
-
 	/* Create a group to tie req to list of blkvsc_reqs */
 	group = kmem_cache_zalloc(blkdev->request_pool, GFP_ATOMIC);
 	if (!group)
@@ -730,11 +696,6 @@ static int blkvsc_do_request(struct block_device_context
*blkdev,
 			 * Map this bio into an existing or new storvsc request
 			 */
 			bio_for_each_segment(bvec, bio, seg_idx) {
-				DPRINT_DBG(BLKVSC_DRV, "bio_for_each_segment() "
-					   "- req %p bio %p bvec %p seg_idx %d "
-					   "databuf_idx %d\n", req, bio, bvec,
-					   seg_idx, databuf_idx);
-
 				/* Get a new storvsc request */
 				/* 1st-time */
 				if ((!blkvsc_req) ||
@@ -827,10 +788,6 @@ static int blkvsc_do_request(struct block_device_context
*blkdev,
 
 	/* Handle the last one */
 	if (blkvsc_req) {
-		DPRINT_DBG(BLKVSC_DRV, "blkdev %p req %p group %p count %d\n",
-			   blkdev, req, blkvsc_req->group,
-			   blkvsc_req->group->outstanding);
-
 		blkvsc_req->sector_start = start_sector;
 		sector_div(blkvsc_req->sector_start,
 			   (blkdev->sector_size >> 9));
@@ -843,13 +800,6 @@ static int blkvsc_do_request(struct block_device_context
*blkdev,
 
 	list_for_each_entry(blkvsc_req, &group->blkvsc_req_list, req_entry) {
 		if (pending) {
-			DPRINT_DBG(BLKVSC_DRV, "adding blkvsc_req to "
-				   "pending_list - blkvsc_req %p start_sect %lu"
-				   " sect_count %ld (%lu %ld)\n", blkvsc_req,
-				   (unsigned long)blkvsc_req->sector_start,
-				   blkvsc_req->sector_count,
-				   (unsigned long)start_sector,
-				   (unsigned long)num_sectors);
 
 			list_add_tail(&blkvsc_req->pend_entry,
 				      &blkdev->pending_list);
@@ -862,13 +812,6 @@ static int blkvsc_do_request(struct block_device_context
*blkdev,
 					      &blkdev->pending_list);
 			}
 
-			DPRINT_DBG(BLKVSC_DRV, "submitted blkvsc_req %p "
-				   "start_sect %lu sect_count %ld (%lu %ld) "
-				   "ret %d\n", blkvsc_req,
-				   (unsigned long)blkvsc_req->sector_start,
-				   blkvsc_req->sector_count,
-				   (unsigned long)start_sector,
-				   num_sectors, ret);
 		}
 	}
 
@@ -883,8 +826,6 @@ static int blkvsc_do_pending_reqs(struct
block_device_context *blkdev)
 	/* Flush the pending list first */
 	list_for_each_entry_safe(pend_req, tmp, &blkdev->pending_list,
 				 pend_entry) {
-		DPRINT_DBG(BLKVSC_DRV, "working off pending_list - %p\n",
-			   pend_req);
 
 		ret = blkvsc_submit_request(pend_req,
 					    blkvsc_request_completion);
@@ -904,9 +845,7 @@ static void blkvsc_request(struct request_queue *queue)
 	struct request *req;
 	int ret = 0;
 
-	DPRINT_DBG(BLKVSC_DRV, "- enter\n");
 	while ((req = blk_peek_request(queue)) != NULL) {
-		DPRINT_DBG(BLKVSC_DRV, "- req %p\n", req);
 
 		blkdev = req->rq_disk->private_data;
 		if (blkdev->shutting_down || req->cmd_type != REQ_TYPE_FS) {
@@ -917,8 +856,6 @@ static void blkvsc_request(struct request_queue *queue)
 		ret = blkvsc_do_pending_reqs(blkdev);
 
 		if (ret != 0) {
-			DPRINT_DBG(BLKVSC_DRV,
-				   "- stop queue - pending_list not empty\n");
 			blk_stop_queue(queue);
 			break;
 		}
@@ -927,11 +864,9 @@ static void blkvsc_request(struct request_queue *queue)
 
 		ret = blkvsc_do_request(blkdev, req);
 		if (ret > 0) {
-			DPRINT_DBG(BLKVSC_DRV, "- stop queue - no room\n");
 			blk_stop_queue(queue);
 			break;
 		} else if (ret < 0) {
-			DPRINT_DBG(BLKVSC_DRV, "- stop queue - no mem\n");
 			blk_requeue_request(queue, req);
 			blk_stop_queue(queue);
 			break;
@@ -1041,7 +976,6 @@ static int blkvsc_probe(struct device *device)
 	static int ide0_registered;
 	static int ide1_registered;
 
-	DPRINT_DBG(BLKVSC_DRV, "blkvsc_probe - enter");
 
 	if (!storvsc_drv_obj->base.dev_add) {
 		DPRINT_ERR(BLKVSC_DRV, "OnDeviceAdd() not set");
@@ -1196,17 +1130,6 @@ static void blkvsc_request_completion(struct
hv_storvsc_request *request)
 	struct vmscsi_request *vm_srb;
 
 
-	DPRINT_DBG(BLKVSC_DRV, "blkdev %p blkvsc_req %p group %p type %s "
-		   "sect_start %lu sect_count %ld len %d group outstd %d "
-		   "total outstd %d\n",
-		   blkdev, blkvsc_req, blkvsc_req->group,
-		   (blkvsc_req->write) ? "WRITE" : "READ",
-		   (unsigned long)blkvsc_req->sector_start,
-		   blkvsc_req->sector_count,
-		   blkvsc_req->request.data_buffer.len,
-		   blkvsc_req->group->outstanding,
-		   blkdev->num_outstanding_reqs);
-
 	spin_lock_irqsave(&blkdev->lock, flags);
 
 	blkdev->num_outstanding_reqs--;
@@ -1221,11 +1144,6 @@ static void blkvsc_request_completion(struct
hv_storvsc_request *request)
 		list_for_each_entry_safe(comp_req, tmp,
 					 &blkvsc_req->group->blkvsc_req_list,
 					 req_entry) {
-			DPRINT_DBG(BLKVSC_DRV, "completing blkvsc_req %p "
-				   "sect_start %lu sect_count %ld\n",
-				   comp_req,
-				   (unsigned long)comp_req->sector_start,
-				   comp_req->sector_count);
 
 			list_del(&comp_req->req_entry);
 
@@ -1238,8 +1156,6 @@ static void blkvsc_request_completion(struct
hv_storvsc_request *request)
 				 * All the sectors have been xferred ie the
 				 * request is done
 				 */
-				DPRINT_DBG(BLKVSC_DRV, "req %p COMPLETED\n",
-					   comp_req->req);
 				kmem_cache_free(blkdev->request_pool,
 						comp_req->group);
 			}
-- 
1.7.4.1

K. Y. Srinivasan

2011-Apr-06 23:05 UTC

head link

[PATCH 13/22] Staging: hv: Cleanup blkvsc_remove()

blkvsc_remove() cannot fail. Clean it up accordingly.

Signed-off-by: K. Y. Srinivasan <kys at microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz at microsoft.com>
Signed-off-by: Hank Janssen <hjanssen at microsoft.com>
---
 drivers/staging/hv/blkvsc_drv.c |   15 +++------------
 1 files changed, 3 insertions(+), 12 deletions(-)

diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c
index 58d4a2d..7974e6c 100644
--- a/drivers/staging/hv/blkvsc_drv.c
+++ b/drivers/staging/hv/blkvsc_drv.c
@@ -556,22 +556,12 @@ static int blkvsc_remove(struct device *device)
 	struct hv_device *device_obj = device_to_hv_device(device);
 	struct block_device_context *blkdev = dev_get_drvdata(device);
 	unsigned long flags;
-	int ret;
-
-
-	if (!storvsc_drv_obj->base.dev_rm)
-		return -1;
 
 	/*
 	 * Call to the vsc driver to let it know that the device is being
 	 * removed
 	 */
-	ret = storvsc_drv_obj->base.dev_rm(device_obj);
-	if (ret != 0) {
-		/* TODO: */
-		DPRINT_ERR(BLKVSC_DRV,
-			   "unable to remove blkvsc device (ret %d)", ret);
-	}
+	storvsc_drv_obj->base.dev_rm(device_obj);
 
 	/* Get to a known state */
 	spin_lock_irqsave(&blkdev->lock, flags);
@@ -604,7 +594,8 @@ static int blkvsc_remove(struct device *device)
 
 	kfree(blkdev);
 
-	return ret;
+	return 0;
+
 }
 
 static void blkvsc_shutdown(struct device *device)
-- 
1.7.4.1

K. Y. Srinivasan

2011-Apr-06 23:05 UTC

head link

[PATCH 14/22] Staging: hv: Cleanup storvsc_remove()

storvsc_remove() cannot fail, clean it up accordingly.

Signed-off-by: K. Y. Srinivasan <kys at microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz at microsoft.com>
Signed-off-by: Hank Janssen <hjanssen at microsoft.com>
---
 drivers/staging/hv/storvsc_drv.c |   14 ++------------
 1 files changed, 2 insertions(+), 12 deletions(-)

diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c
index ae61735..f819c6a 100644
--- a/drivers/staging/hv/storvsc_drv.c
+++ b/drivers/staging/hv/storvsc_drv.c
@@ -404,7 +404,6 @@ static int storvsc_probe(struct device *device)
  */
 static int storvsc_remove(struct device *device)
 {
-	int ret;
 	struct hv_driver *drv  			drv_to_hv_drv(device->driver);
 	struct storvsc_driver_object *storvsc_drv_obj = drv->priv;
@@ -413,20 +412,11 @@ static int storvsc_remove(struct device *device)
 	struct host_device_context *host_device_ctx  			(struct host_device_context
*)host->hostdata;
 
-
-	if (!storvsc_drv_obj->base.dev_rm)
-		return -1;
-
 	/*
 	 * Call to the vsc driver to let it know that the device is being
 	 * removed
 	 */
-	ret = storvsc_drv_obj->base.dev_rm(device_obj);
-	if (ret != 0) {
-		/* TODO: */
-		DPRINT_ERR(STORVSC, "unable to remove vsc device (ret %d)",
-			   ret);
-	}
+	storvsc_drv_obj->base.dev_rm(device_obj);
 
 	if (host_device_ctx->request_pool) {
 		kmem_cache_destroy(host_device_ctx->request_pool);
@@ -438,7 +428,7 @@ static int storvsc_remove(struct device *device)
 
 	DPRINT_INFO(STORVSC, "releasing host adapter (%p)...", host);
 	scsi_host_put(host);
-	return ret;
+	return 0;
 }
 
 /*
-- 
1.7.4.1

K. Y. Srinivasan

2011-Apr-06 23:05 UTC

head link

[PATCH 16/22] Staging: hv: Get rid of some DPRINT_ERR() calls

Get rid of some DPRINT_ERR() calls.

Signed-off-by: K. Y. Srinivasan <kys at microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz at microsoft.com>
Signed-off-by: Hank Janssen <hjanssen at microsoft.com>
---
 drivers/staging/hv/blkvsc_drv.c |    9 +++------
 1 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c
index 92614d5..35ad3d5 100644
--- a/drivers/staging/hv/blkvsc_drv.c
+++ b/drivers/staging/hv/blkvsc_drv.c
@@ -17,6 +17,8 @@
  * Authors:
  *   Haiyang Zhang <haiyangz at microsoft.com>
  *   Hank Janssen  <hjanssen at microsoft.com>
+ *
+ * 4/3/2011: K. Y. Srinivasan - Significant restructuring and cleanup.
  */
 #include <linux/init.h>
 #include <linux/module.h>
@@ -967,7 +969,6 @@ static int blkvsc_probe(struct device *device)
 
 
 	if (!storvsc_drv_obj->base.dev_add) {
-		DPRINT_ERR(BLKVSC_DRV, "OnDeviceAdd() not set");
 		ret = -1;
 		goto Cleanup;
 	}
@@ -995,10 +996,8 @@ static int blkvsc_probe(struct device *device)
 
 	/* Call to the vsc driver to add the device */
 	ret = storvsc_drv_obj->base.dev_add(device_obj, &device_info);
-	if (ret != 0) {
-		DPRINT_ERR(BLKVSC_DRV, "unable to add blkvsc device");
+	if (ret != 0)
 		goto Cleanup;
-	}
 
 	blkdev->device_ctx = device_obj;
 	/* this identified the device 0 or 1 */
@@ -1040,7 +1039,6 @@ static int blkvsc_probe(struct device *device)
 			ide1_registered = 1;
 		}
 	} else {
-		DPRINT_ERR(BLKVSC_DRV, "invalid pathid");
 		ret = -1;
 		goto Cleanup;
 	}
@@ -1049,7 +1047,6 @@ static int blkvsc_probe(struct device *device)
 
 	blkdev->gd = alloc_disk(BLKVSC_MINORS);
 	if (!blkdev->gd) {
-		DPRINT_ERR(BLKVSC_DRV, "register_blkdev() failed! ret %d", ret);
 		ret = -1;
 		goto Cleanup;
 	}
-- 
1.7.4.1

K. Y. Srinivasan

2011-Apr-06 23:05 UTC

head link

[PATCH 17/22] Staging: hv: Get rid of an unnecessary check in blkvsc_probe()

It is never the case that the dev_add function pointer will not be set
(we set it in this code!). Get rid of this meaningless check.

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

diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c
index 35ad3d5..3060bab 100644
--- a/drivers/staging/hv/blkvsc_drv.c
+++ b/drivers/staging/hv/blkvsc_drv.c
@@ -968,11 +968,6 @@ static int blkvsc_probe(struct device *device)
 	static int ide1_registered;
 
 
-	if (!storvsc_drv_obj->base.dev_add) {
-		ret = -1;
-		goto Cleanup;
-	}
-
 	blkdev = kzalloc(sizeof(struct block_device_context), GFP_KERNEL);
 	if (!blkdev) {
 		ret = -ENOMEM;
-- 
1.7.4.1

K. Y. Srinivasan

2011-Apr-06 23:05 UTC

head link

[PATCH 18/22] Staging: hv: Cleanup blkvsc_open()

Given that we don't support removable media, cleanup blkvsc_open().

Signed-off-by: K. Y. Srinivasan <kys at microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz at microsoft.com>
Signed-off-by: Hank Janssen <hjanssen at microsoft.com>
---
 drivers/staging/hv/blkvsc_drv.c |   10 +---------
 1 files changed, 1 insertions(+), 9 deletions(-)

diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c
index 3060bab..bf8647e 100644
--- a/drivers/staging/hv/blkvsc_drv.c
+++ b/drivers/staging/hv/blkvsc_drv.c
@@ -255,20 +255,12 @@ static int blkvsc_open(struct block_device *bdev, fmode_t
mode)
 {
 	struct block_device_context *blkdev = bdev->bd_disk->private_data;
 
-
-	mutex_lock(&blkvsc_mutex);
 	spin_lock(&blkdev->lock);
 
-	if (!blkdev->users && blkdev->device_type == DVD_TYPE) {
-		spin_unlock(&blkdev->lock);
-		check_disk_change(bdev);
-		spin_lock(&blkdev->lock);
-	}
-
 	blkdev->users++;
 
 	spin_unlock(&blkdev->lock);
-	mutex_unlock(&blkvsc_mutex);
+
 	return 0;
 }
 
-- 
1.7.4.1

K. Y. Srinivasan

2011-Apr-06 23:05 UTC

head link

[PATCH 19/22] Staging: hv: Fix a jump label (Cleanup) in blkvsc_drv

One of the goto labels was named Cleanup; change it to cleanup.

Signed-off-by: K. Y. Srinivasan <kys at microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz at microsoft.com>
Signed-off-by: Hank Janssen <hjanssen at microsoft.com>
---
 drivers/staging/hv/blkvsc_drv.c |   12 ++++++------
 1 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c
index bf8647e..a47581c 100644
--- a/drivers/staging/hv/blkvsc_drv.c
+++ b/drivers/staging/hv/blkvsc_drv.c
@@ -963,7 +963,7 @@ static int blkvsc_probe(struct device *device)
 	blkdev = kzalloc(sizeof(struct block_device_context), GFP_KERNEL);
 	if (!blkdev) {
 		ret = -ENOMEM;
-		goto Cleanup;
+		goto cleanup;
 	}
 
 	INIT_LIST_HEAD(&blkdev->pending_list);
@@ -977,14 +977,14 @@ static int blkvsc_probe(struct device *device)
 					SLAB_HWCACHE_ALIGN, NULL);
 	if (!blkdev->request_pool) {
 		ret = -ENOMEM;
-		goto Cleanup;
+		goto cleanup;
 	}
 
 
 	/* Call to the vsc driver to add the device */
 	ret = storvsc_drv_obj->base.dev_add(device_obj, &device_info);
 	if (ret != 0)
-		goto Cleanup;
+		goto cleanup;
 
 	blkdev->device_ctx = device_obj;
 	/* this identified the device 0 or 1 */
@@ -1027,7 +1027,7 @@ static int blkvsc_probe(struct device *device)
 		}
 	} else {
 		ret = -1;
-		goto Cleanup;
+		goto cleanup;
 	}
 
 	DPRINT_INFO(BLKVSC_DRV, "blkvsc registered for major %d!!", major);
@@ -1035,7 +1035,7 @@ static int blkvsc_probe(struct device *device)
 	blkdev->gd = alloc_disk(BLKVSC_MINORS);
 	if (!blkdev->gd) {
 		ret = -1;
-		goto Cleanup;
+		goto cleanup;
 	}
 
 	blkdev->gd->queue = blk_init_queue(blkvsc_request,
&blkdev->lock);
@@ -1074,7 +1074,7 @@ static int blkvsc_probe(struct device *device)
 Remove:
 	storvsc_drv_obj->base.dev_rm(device_obj);
 
-Cleanup:
+cleanup:
 	if (blkdev) {
 		if (blkdev->request_pool) {
 			kmem_cache_destroy(blkdev->request_pool);
-- 
1.7.4.1

K. Y. Srinivasan

2011-Apr-06 23:05 UTC

head link

[PATCH 20/22] Staging: hv: Fix a jump label (Remove) in blkvsc_drv.c

One of the jump labels was named Remove; change it to remove.

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

diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c
index a47581c..3229ebc 100644
--- a/drivers/staging/hv/blkvsc_drv.c
+++ b/drivers/staging/hv/blkvsc_drv.c
@@ -1005,7 +1005,7 @@ static int blkvsc_probe(struct device *device)
 				DPRINT_ERR(BLKVSC_DRV,
 					   "register_blkdev() failed! ret %d",
 					   ret);
-				goto Remove;
+				goto remove;
 			}
 
 			ide0_registered = 1;
@@ -1020,7 +1020,7 @@ static int blkvsc_probe(struct device *device)
 				DPRINT_ERR(BLKVSC_DRV,
 					   "register_blkdev() failed! ret %d",
 					   ret);
-				goto Remove;
+				goto remove;
 			}
 
 			ide1_registered = 1;
@@ -1071,7 +1071,7 @@ static int blkvsc_probe(struct device *device)
 
 	return ret;
 
-Remove:
+remove:
 	storvsc_drv_obj->base.dev_rm(device_obj);
 
 cleanup:
-- 
1.7.4.1

K. Y. Srinivasan

2011-Apr-06 23:05 UTC

head link

[PATCH 21/22] Staging: hv: Introduce a function to map channel properties onto block device info

In preparation for removing the IDE details from the block driver, implement
a function that maps channel properties to block device information.

Signed-off-by: K. Y. Srinivasan <kys at microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz at microsoft.com>
Signed-off-by: Hank Janssen <hjanssen at microsoft.com>
---
 drivers/staging/hv/storvsc.c     |   68 ++++++++++++++++++++++++++++++++++++++
 drivers/staging/hv/storvsc_api.h |   10 +++++
 2 files changed, 78 insertions(+), 0 deletions(-)

diff --git a/drivers/staging/hv/storvsc.c b/drivers/staging/hv/storvsc.c
index d7ce393..e2b3410 100644
--- a/drivers/staging/hv/storvsc.c
+++ b/drivers/staging/hv/storvsc.c
@@ -17,6 +17,8 @@
  * Authors:
  *   Haiyang Zhang <haiyangz at microsoft.com>
  *   Hank Janssen  <hjanssen at microsoft.com>
+ *
+ * 4/3/2011: K. Y. Srinivasan - Significant restructuring and cleanup.
  */
 #include <linux/kernel.h>
 #include <linux/sched.h>
@@ -593,6 +595,72 @@ int stor_vsc_on_io_request(struct hv_device *device,
 }
 
 /*
+ * The channel properties uniquely specify how the device is to be
+ * presented to the guest. Map this information for use by the block
+ * driver. For Linux guests on Hyper-V, we emulate a scsi HBA in the guest
+ * (storvsc_drv) and so scsi devices in the guest  are handled by
+ * native upper level Linux drivers. Consequently, Hyper-V
+ * block driver, while being a generic block driver, presently does not
+ * deal with anything other than devices that would need to be presented
+ * to the guest as an IDE disk.
+ *
+ * This function maps the channel properties as embedded in the input
+ * parameter device_info onto information necessary to register the
+ * corresponding block device.
+ *
+ * Currently, there is no way to stop the emulation of the block device
+ * on the host side. And so, to prevent the native IDE drivers in Linux
+ * from taking over these devices (to be managedby Hyper-V block
+ * driver), we will take over if need be the major of the IDE controllers.
+ *
+ */
+
+int stor_vsc_get_major_info(struct storvsc_device_info *device_info,
+			    struct storvsc_major_info *major_info)
+{
+	static bool ide0_registered;
+	static bool ide1_registered;
+
+	/*
+	 * For now we only support IDE disks.
+	 */
+	major_info->devname = "ide";
+	major_info->diskname = "hd";
+
+	if (device_info->path_id) {
+		major_info->major = 22;
+		if (!ide1_registered)
+			major_info->do_register = true;
+		else {
+			major_info->do_register = false;
+			ide1_registered = true;
+		}
+		if (device_info->target_id)
+			major_info->index = 3;
+		 else
+			major_info->index = 2;
+
+		return 0;
+	} else {
+		major_info->major = 3;
+		if (!ide0_registered)
+			major_info->do_register = true;
+		else {
+			major_info->do_register = false;
+			ide0_registered = true;
+		}
+		if (device_info->target_id)
+			major_info->index = 1;
+		else
+			major_info->index = 0;
+
+		return 0;
+	}
+
+	return -ENODEV;
+}
+
+/*
  * stor_vsc_on_cleanup - Perform any cleanup when the driver is removed
  */
 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 d7db949..c98139c 100644
--- a/drivers/staging/hv/storvsc_api.h
+++ b/drivers/staging/hv/storvsc_api.h
@@ -92,6 +92,14 @@ struct storvsc_device_info {
 	unsigned char target_id;
 };
 
+struct storvsc_major_info {
+	int major;
+	int index;
+	bool do_register;
+	char *devname;
+	char *diskname;
+};
+
 /* A storvsc device is a device object that contains a vmbus channel */
 struct storvsc_device {
 	struct hv_device *device;
@@ -155,5 +163,7 @@ int stor_vsc_on_io_request(struct hv_device *device,
 				struct hv_storvsc_request *request);
 void stor_vsc_on_cleanup(struct hv_driver *driver);
 
+int stor_vsc_get_major_info(struct storvsc_device_info *device_info,
+				struct storvsc_major_info *major_info);
 
 #endif /* _STORVSC_API_H_ */
-- 
1.7.4.1

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