Message-Id: <1314469905-7058-20-git-send-email-kys@microsoft.com>
Date:	Sat, 27 Aug 2011 11:31:19 -0700
From:	"K. Y. Srinivasan" <kys@...rosoft.com>
To:	gregkh@...e.de, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, virtualization@...ts.osdl.org
Cc:	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>
Subject: [PATCH 20/46] Staging: hv: blkvsc: Get rid of blkvsc_drv.c as this code is not used

Now that blkvsc driver is no longer needed, remove blkvsc_drv.c

Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
---
 drivers/staging/hv/blkvsc_drv.c | 1014 ---------------------------------------
 1 files changed, 0 insertions(+), 1014 deletions(-)
 delete mode 100644 drivers/staging/hv/blkvsc_drv.c

diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c
deleted file mode 100644
index 2b41eb6..0000000
--- a/drivers/staging/hv/blkvsc_drv.c
+++ /dev/null
@@ -1,1014 +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@...rosoft.com>
- *   Hank Janssen  <hjanssen@...rosoft.com>
- *   K. Y. Srinivasan <kys@...rosoft.com>
- */
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/device.h>
-#include <linux/blkdev.h>
-#include <linux/major.h>
-#include <linux/delay.h>
-#include <linux/hdreg.h>
-#include <linux/slab.h>
-#include <scsi/scsi.h>
-#include <scsi/scsi_cmnd.h>
-#include <scsi/scsi_eh.h>
-#include <scsi/scsi_dbg.h>
-
-#include "hyperv.h"
-#include "hyperv_storage.h"
-
-
-#define BLKVSC_MINORS	64
-
-enum blkvsc_device_type {
-	UNKNOWN_DEV_TYPE,
-	HARDDISK_TYPE,
-	DVD_TYPE,
-};
-
-enum blkvsc_op_type {
-	DO_INQUIRY,
-	DO_CAPACITY,
-	DO_FLUSH,
-};
-
-/*
- * This request ties the struct request and struct
- * blkvsc_request/hv_storvsc_request together A struct request may be
- * represented by 1 or more struct blkvsc_request
- */
-struct blkvsc_request_group {
-	int outstanding;
-	int status;
-	struct list_head blkvsc_req_list;	/* list of blkvsc_requests */
-};
-
-struct blkvsc_request {
-	/* blkvsc_request_group.blkvsc_req_list */
-	struct list_head req_entry;
-
-	/* block_device_context.pending_list */
-	struct list_head pend_entry;
-
-	/* This may be null if we generate a request internally */
-	struct request *req;
-
-	struct block_device_context *dev;
-
-	/* The group this request is part of. Maybe null */
-	struct blkvsc_request_group *group;
-
-	int write;
-	sector_t sector_start;
-	unsigned long sector_count;
-
-	unsigned char sense_buffer[SCSI_SENSE_BUFFERSIZE];
-	unsigned char cmd_len;
-	unsigned char cmnd[MAX_COMMAND_SIZE];
-
-	struct hv_storvsc_request request;
-};
-
-/* Per device structure */
-struct block_device_context {
-	/* point back to our device context */
-	struct hv_device *device_ctx;
-	struct kmem_cache *request_pool;
-	spinlock_t lock;
-	struct gendisk *gd;
-	enum blkvsc_device_type	device_type;
-	struct list_head pending_list;
-
-	unsigned char device_id[64];
-	unsigned int device_id_len;
-	int num_outstanding_reqs;
-	int shutting_down;
-	unsigned int sector_size;
-	sector_t capacity;
-	unsigned int port;
-	unsigned char path;
-	unsigned char target;
-	int users;
-};
-
-
-/*
- * There is a circular dependency involving blkvsc_request_completion()
- * and blkvsc_do_request().
- */
-static void blkvsc_request_completion(struct hv_storvsc_request *request);
-
-static int blkvsc_ringbuffer_size = BLKVSC_RING_BUFFER_SIZE;
-
-module_param(blkvsc_ringbuffer_size, int, S_IRUGO);
-MODULE_PARM_DESC(ring_size, "Ring buffer size (in bytes)");
-
-/*
- * There is a circular dependency involving blkvsc_probe()
- * and block_ops.
- */
-static int blkvsc_probe(struct hv_device *dev);
-
-static int blkvsc_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;
-
-	device_info->ring_buffer_size = blkvsc_ringbuffer_size;
-
-	ret = storvsc_dev_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.b[3] << 24 |
-			     device->dev_instance.b[2] << 16 |
-			     device->dev_instance.b[1] << 8  |
-			     device->dev_instance.b[0];
-
-	device_info->target_id = device->dev_instance.b[5] << 8 |
-			       device->dev_instance.b[4];
-
-	return ret;
-}
-
-static int blkvsc_submit_request(struct blkvsc_request *blkvsc_req,
-			void (*request_completion)(struct hv_storvsc_request *))
-{
-	struct block_device_context *blkdev = blkvsc_req->dev;
-	struct hv_storvsc_request *storvsc_req;
-	struct vmscsi_request *vm_srb;
-	int ret;
-
-
-	storvsc_req = &blkvsc_req->request;
-	vm_srb = &storvsc_req->vstor_packet.vm_srb;
-
-	vm_srb->data_in = blkvsc_req->write ? WRITE_TYPE : READ_TYPE;
-
-	storvsc_req->on_io_completion = request_completion;
-	storvsc_req->context = blkvsc_req;
-
-	vm_srb->port_number = blkdev->port;
-	vm_srb->path_id = blkdev->path;
-	vm_srb->target_id = blkdev->target;
-	vm_srb->lun = 0;	 /* this is not really used at all */
-
-	vm_srb->cdb_length = blkvsc_req->cmd_len;
-
-	memcpy(vm_srb->cdb, blkvsc_req->cmnd, vm_srb->cdb_length);
-
-	storvsc_req->sense_buffer = blkvsc_req->sense_buffer;
-
-	ret =  storvsc_do_io(blkdev->device_ctx,
-					   &blkvsc_req->request);
-	if (ret == 0)
-		blkdev->num_outstanding_reqs++;
-
-	return ret;
-}
-
-
-static int blkvsc_open(struct block_device *bdev, fmode_t mode)
-{
-	struct block_device_context *blkdev = bdev->bd_disk->private_data;
-	unsigned long flags;
-
-	spin_lock_irqsave(&blkdev->lock, flags);
-
-	blkdev->users++;
-
-	spin_unlock_irqrestore(&blkdev->lock, flags);
-
-	return 0;
-}
-
-
-static int blkvsc_getgeo(struct block_device *bd, struct hd_geometry *hg)
-{
-	sector_t nsect = get_capacity(bd->bd_disk);
-	sector_t cylinders = nsect;
-
-	/*
-	 * 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;
-	if ((sector_t)(hg->cylinders + 1) * hg->heads * hg->sectors < nsect)
-		hg->cylinders = 0xffff;
-	return 0;
-
-}
-
-
-static void blkvsc_init_rw(struct blkvsc_request *blkvsc_req)
-{
-
-	blkvsc_req->cmd_len = 16;
-
-	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);
-}
-
-
-static int blkvsc_ioctl(struct block_device *bd, fmode_t mode,
-			unsigned cmd, unsigned long arg)
-{
-	struct block_device_context *blkdev = bd->bd_disk->private_data;
-	int ret = 0;
-
-	switch (cmd) {
-	case HDIO_GET_IDENTITY:
-		if (copy_to_user((void __user *)arg, blkdev->device_id,
-				 blkdev->device_id_len))
-			ret = -EFAULT;
-		break;
-	default:
-		ret = -EINVAL;
-		break;
-	}
-
-	return ret;
-}
-
-static void blkvsc_cmd_completion(struct hv_storvsc_request *request)
-{
-	struct blkvsc_request *blkvsc_req =
-			(struct blkvsc_request *)request->context;
-	struct block_device_context *blkdev =
-			(struct block_device_context *)blkvsc_req->dev;
-	struct scsi_sense_hdr sense_hdr;
-	struct vmscsi_request *vm_srb;
-	unsigned long flags;
-
-
-	vm_srb = &blkvsc_req->request.vstor_packet.vm_srb;
-
-	spin_lock_irqsave(&blkdev->lock, flags);
-	blkdev->num_outstanding_reqs--;
-	spin_unlock_irqrestore(&blkdev->lock, flags);
-
-	if (vm_srb->scsi_status)
-		if (scsi_normalize_sense(blkvsc_req->sense_buffer,
-					 SCSI_SENSE_BUFFERSIZE, &sense_hdr))
-			scsi_print_sense_hdr("blkvsc", &sense_hdr);
-
-	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;
-	struct scsi_sense_hdr sense_hdr;
-	struct vmscsi_request *vm_srb;
-	unsigned long flags;
-
-	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(blkdev->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;
-
-	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;
-
-	case DO_CAPACITY:
-		blkdev->sector_size = 0;
-		blkdev->capacity = 0;
-
-		blkvsc_req->cmnd[0] = READ_CAPACITY;
-		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;
-	}
-
-	spin_lock_irqsave(&blkdev->lock, flags);
-	blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion);
-	spin_unlock_irqrestore(&blkdev->lock, flags);
-
-	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);
-
-		return 0;
-	}
-
-	buf = kmap(page_buf);
-
-	switch (op) {
-	case DO_INQUIRY:
-		device_type = buf[0] & 0x1F;
-
-		if (device_type == 0x0)
-			blkdev->device_type = HARDDISK_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;
-
-	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;
-	default:
-		break;
-
-	}
-
-cleanup:
-
-	kunmap(page_buf);
-
-	__free_page(page_buf);
-
-	kmem_cache_free(blkdev->request_pool, blkvsc_req);
-
-	return ret;
-}
-
-
-static int blkvsc_cancel_pending_reqs(struct block_device_context *blkdev)
-{
-	struct blkvsc_request *pend_req, *tmp;
-	struct blkvsc_request *comp_req, *tmp2;
-	struct vmscsi_request *vm_srb;
-
-	int ret = 0;
-
-
-	/* Flush the pending list first */
-	list_for_each_entry_safe(pend_req, tmp, &blkdev->pending_list,
-				 pend_entry) {
-		/*
-		 * The pend_req could be part of a partially completed
-		 * request. If so, complete those req first until we
-		 * hit the pend_req
-		 */
-		list_for_each_entry_safe(comp_req, tmp2,
-					 &pend_req->group->blkvsc_req_list,
-					 req_entry) {
-
-			if (comp_req == pend_req)
-				break;
-
-			list_del(&comp_req->req_entry);
-
-			if (comp_req->req) {
-				vm_srb =
-				&comp_req->request.vstor_packet.
-				vm_srb;
-				ret = __blk_end_request(comp_req->req,
-					(!vm_srb->scsi_status ? 0 : -EIO),
-					comp_req->sector_count *
-					blkdev->sector_size);
-
-				/* FIXME: shouldn't this do more than return? */
-				if (ret)
-					goto out;
-			}
-
-			kmem_cache_free(blkdev->request_pool, comp_req);
-		}
-
-		list_del(&pend_req->pend_entry);
-
-		list_del(&pend_req->req_entry);
-
-		if (comp_req->req) {
-			if (!__blk_end_request(pend_req->req, -EIO,
-					       pend_req->sector_count *
-					       blkdev->sector_size)) {
-				/*
-				 * All the sectors have been xferred ie the
-				 * request is done
-				 */
-				kmem_cache_free(blkdev->request_pool,
-						pend_req->group);
-			}
-		}
-
-		kmem_cache_free(blkdev->request_pool, pend_req);
-	}
-
-out:
-	return ret;
-}
-
-
-/*
- * blkvsc_remove() - Callback when our device is removed
- */
-static int blkvsc_remove(struct hv_device *dev)
-{
-	struct block_device_context *blkdev = dev_get_drvdata(&dev->device);
-	unsigned long flags;
-
-
-	/* Get to a known state */
-	spin_lock_irqsave(&blkdev->lock, flags);
-
-	blkdev->shutting_down = 1;
-
-	blk_stop_queue(blkdev->gd->queue);
-
-	blkvsc_cancel_pending_reqs(blkdev);
-
-	spin_unlock_irqrestore(&blkdev->lock, flags);
-
-	blkvsc_do_operation(blkdev, DO_FLUSH);
-
-	if (blkdev->users == 0) {
-		del_gendisk(blkdev->gd);
-		put_disk(blkdev->gd);
-		blk_cleanup_queue(blkdev->gd->queue);
-
-		storvsc_dev_remove(blkdev->device_ctx);
-
-		kmem_cache_destroy(blkdev->request_pool);
-		kfree(blkdev);
-	}
-
-	return 0;
-}
-
-static void blkvsc_shutdown(struct hv_device *dev)
-{
-	struct block_device_context *blkdev = dev_get_drvdata(&dev->device);
-	unsigned long flags;
-
-	if (!blkdev)
-		return;
-
-	spin_lock_irqsave(&blkdev->lock, flags);
-
-	blkdev->shutting_down = 1;
-
-	blk_stop_queue(blkdev->gd->queue);
-
-	blkvsc_cancel_pending_reqs(blkdev);
-
-	spin_unlock_irqrestore(&blkdev->lock, flags);
-
-	blkvsc_do_operation(blkdev, DO_FLUSH);
-
-	/*
-	 * Now wait for all outgoing I/O to be drained.
-	 */
-	storvsc_wait_to_drain((struct storvsc_device *)dev->ext);
-
-}
-
-static int blkvsc_release(struct gendisk *disk, fmode_t mode)
-{
-	struct block_device_context *blkdev = disk->private_data;
-	unsigned long flags;
-
-	spin_lock_irqsave(&blkdev->lock, flags);
-
-	if ((--blkdev->users == 0) && (blkdev->shutting_down)) {
-		blk_stop_queue(blkdev->gd->queue);
-		spin_unlock_irqrestore(&blkdev->lock, flags);
-
-		blkvsc_do_operation(blkdev, DO_FLUSH);
-		del_gendisk(blkdev->gd);
-		put_disk(blkdev->gd);
-		blk_cleanup_queue(blkdev->gd->queue);
-
-		storvsc_dev_remove(blkdev->device_ctx);
-
-		kmem_cache_destroy(blkdev->request_pool);
-		kfree(blkdev);
-	} else
-		spin_unlock_irqrestore(&blkdev->lock, flags);
-
-	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
- * pending_list. The blkvsc_request() will work on the pending_list.
- */
-static int blkvsc_do_request(struct block_device_context *blkdev,
-			     struct request *req)
-{
-	struct bio *bio = NULL;
-	struct bio_vec *bvec = NULL;
-	struct bio_vec *prev_bvec = NULL;
-	struct blkvsc_request *blkvsc_req = NULL;
-	struct blkvsc_request *tmp;
-	int databuf_idx = 0;
-	int seg_idx = 0;
-	sector_t start_sector;
-	unsigned long num_sectors = 0;
-	int ret = 0;
-	int pending = 0;
-	struct blkvsc_request_group *group = NULL;
-
-	/* Create a group to tie req to list of blkvsc_reqs */
-	group = kmem_cache_zalloc(blkdev->request_pool, GFP_ATOMIC);
-	if (!group)
-		return -ENOMEM;
-
-	INIT_LIST_HEAD(&group->blkvsc_req_list);
-	group->outstanding = group->status = 0;
-
-	start_sector = blk_rq_pos(req);
-
-	/* foreach bio in the request */
-	if (req->bio) {
-		for (bio = req->bio; bio; bio = bio->bi_next) {
-			/*
-			 * Map this bio into an existing or new storvsc request
-			 */
-			bio_for_each_segment(bvec, bio, seg_idx) {
-				/* Get a new storvsc request */
-				/* 1st-time */
-				if ((!blkvsc_req) ||
-				    (databuf_idx >= MAX_MULTIPAGE_BUFFER_COUNT)
-				    /* hole at the begin of page */
-				    || (bvec->bv_offset != 0) ||
-				    /* hold at the end of page */
-				    (prev_bvec &&
-				     (prev_bvec->bv_len != PAGE_SIZE))) {
-					/* submit the prev one */
-					if (blkvsc_req) {
-						blkvsc_req->sector_start =
-						start_sector;
-						sector_div(
-						blkvsc_req->sector_start,
-						(blkdev->sector_size >> 9));
-
-						blkvsc_req->sector_count =
-						num_sectors /
-						(blkdev->sector_size >> 9);
-						blkvsc_init_rw(blkvsc_req);
-					}
-
-					/*
-					 * Create new blkvsc_req to represent
-					 * the current bvec
-					 */
-					blkvsc_req =
-					kmem_cache_zalloc(
-					blkdev->request_pool, GFP_ATOMIC);
-					if (!blkvsc_req) {
-						/* free up everything */
-						list_for_each_entry_safe(
-							blkvsc_req, tmp,
-							&group->blkvsc_req_list,
-							req_entry) {
-							list_del(
-							&blkvsc_req->req_entry);
-							kmem_cache_free(
-							blkdev->request_pool,
-							blkvsc_req);
-						}
-
-						kmem_cache_free(
-						blkdev->request_pool, group);
-						return -ENOMEM;
-					}
-
-					memset(blkvsc_req, 0,
-					       sizeof(struct blkvsc_request));
-
-					blkvsc_req->dev = blkdev;
-					blkvsc_req->req = req;
-					blkvsc_req->request.
-					data_buffer.offset
-					= bvec->bv_offset;
-					blkvsc_req->request.
-					data_buffer.len = 0;
-
-					/* Add to the group */
-					blkvsc_req->group = group;
-					blkvsc_req->group->outstanding++;
-					list_add_tail(&blkvsc_req->req_entry,
-					&blkvsc_req->group->blkvsc_req_list);
-
-					start_sector += num_sectors;
-					num_sectors = 0;
-					databuf_idx = 0;
-				}
-
-				/*
-				 * Add the curr bvec/segment to the curr
-				 * blkvsc_req
-				 */
-				blkvsc_req->request.data_buffer.
-					pfn_array[databuf_idx]
-						= page_to_pfn(bvec->bv_page);
-				blkvsc_req->request.data_buffer.len
-					+= bvec->bv_len;
-
-				prev_bvec = bvec;
-
-				databuf_idx++;
-				num_sectors += bvec->bv_len >> 9;
-
-			} /* bio_for_each_segment */
-
-		} /* rq_for_each_bio */
-	}
-
-	/* Handle the last one */
-	if (blkvsc_req) {
-		blkvsc_req->sector_start = start_sector;
-		sector_div(blkvsc_req->sector_start,
-			   (blkdev->sector_size >> 9));
-
-		blkvsc_req->sector_count = num_sectors /
-					   (blkdev->sector_size >> 9);
-
-		blkvsc_init_rw(blkvsc_req);
-	}
-
-	list_for_each_entry(blkvsc_req, &group->blkvsc_req_list, req_entry) {
-		if (pending) {
-
-			list_add_tail(&blkvsc_req->pend_entry,
-				      &blkdev->pending_list);
-		} else {
-			ret = blkvsc_submit_request(blkvsc_req,
-						    blkvsc_request_completion);
-			if (ret == -EAGAIN) {
-				pending = 1;
-				list_add_tail(&blkvsc_req->pend_entry,
-					      &blkdev->pending_list);
-			}
-
-		}
-	}
-
-	return pending;
-}
-
-static int blkvsc_do_pending_reqs(struct block_device_context *blkdev)
-{
-	struct blkvsc_request *pend_req, *tmp;
-	int ret = 0;
-
-	/* Flush the pending list first */
-	list_for_each_entry_safe(pend_req, tmp, &blkdev->pending_list,
-				 pend_entry) {
-
-		ret = blkvsc_submit_request(pend_req,
-					    blkvsc_request_completion);
-		if (ret != 0)
-			break;
-		else
-			list_del(&pend_req->pend_entry);
-	}
-
-	return ret;
-}
-
-
-static void blkvsc_request(struct request_queue *queue)
-{
-	struct block_device_context *blkdev = NULL;
-	struct request *req;
-	int ret = 0;
-
-	while ((req = blk_peek_request(queue)) != NULL) {
-
-		blkdev = req->rq_disk->private_data;
-		if (blkdev->shutting_down || req->cmd_type != REQ_TYPE_FS) {
-			__blk_end_request_cur(req, 0);
-			continue;
-		}
-
-		ret = blkvsc_do_pending_reqs(blkdev);
-
-		if (ret != 0) {
-			blk_stop_queue(queue);
-			break;
-		}
-
-		blk_start_request(req);
-
-		ret = blkvsc_do_request(blkdev, req);
-		if (ret > 0) {
-			blk_stop_queue(queue);
-			break;
-		} else if (ret < 0) {
-			blk_requeue_request(queue, req);
-			blk_stop_queue(queue);
-			break;
-		}
-	}
-}
-
-static const struct hv_vmbus_device_id id_table[] = {
-	/* IDE guid */
-	{ VMBUS_DEVICE(0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
-		       0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5) },
-	{ },
-};
-
-MODULE_DEVICE_TABLE(vmbus, id_table);
-
-/* The one and only one */
-static  struct hv_driver blkvsc_drv = {
-	.name = "blkvsc",
-	.id_table = id_table,
-	.probe =  blkvsc_probe,
-	.remove =  blkvsc_remove,
-	.shutdown = blkvsc_shutdown,
-};
-
-static const struct block_device_operations block_ops = {
-	.owner = THIS_MODULE,
-	.open = blkvsc_open,
-	.release = blkvsc_release,
-	.getgeo = blkvsc_getgeo,
-	.ioctl  = blkvsc_ioctl,
-};
-
-/*
- * blkvsc_drv_init -  BlkVsc driver initialization.
- */
-static int blkvsc_drv_init(void)
-{
-	BUILD_BUG_ON(sizeof(sector_t) != 8);
-	return vmbus_driver_register(&blkvsc_drv);
-}
-
-static void blkvsc_drv_exit(void)
-{
-	vmbus_driver_unregister(&blkvsc_drv);
-}
-
-/*
- * blkvsc_probe - Add a new device for this driver
- */
-static int blkvsc_probe(struct hv_device *dev)
-{
-	struct block_device_context *blkdev = NULL;
-	struct storvsc_device_info device_info;
-	struct storvsc_major_info major_info;
-	int ret = 0;
-
-	blkdev = kzalloc(sizeof(struct block_device_context), GFP_KERNEL);
-	if (!blkdev) {
-		ret = -ENOMEM;
-		goto cleanup;
-	}
-
-	INIT_LIST_HEAD(&blkdev->pending_list);
-
-	/* Initialize what we can here */
-	spin_lock_init(&blkdev->lock);
-
-
-	blkdev->request_pool = kmem_cache_create(dev_name(&dev->device),
-					sizeof(struct blkvsc_request), 0,
-					SLAB_HWCACHE_ALIGN, NULL);
-	if (!blkdev->request_pool) {
-		ret = -ENOMEM;
-		goto cleanup;
-	}
-
-
-	ret = blkvsc_device_add(dev, &device_info);
-	if (ret != 0)
-		goto cleanup;
-
-	blkdev->device_ctx = dev;
-	/* this identified the device 0 or 1 */
-	blkdev->target = device_info.target_id;
-	/* this identified the ide ctrl 0 or 1 */
-	blkdev->path = device_info.path_id;
-
-	dev_set_drvdata(&dev->device, blkdev);
-
-	ret = storvsc_get_major_info(&device_info, &major_info);
-
-	if (ret)
-		goto cleanup;
-
-	if (major_info.do_register) {
-		ret = register_blkdev(major_info.major, major_info.devname);
-
-		if (ret != 0) {
-			DPRINT_ERR(BLKVSC_DRV,
-				   "register_blkdev() failed! ret %d", ret);
-			goto remove;
-		}
-	}
-
-	DPRINT_INFO(BLKVSC_DRV, "blkvsc registered for major %d!!",
-			major_info.major);
-
-	blkdev->gd = alloc_disk(BLKVSC_MINORS);
-	if (!blkdev->gd) {
-		ret = -1;
-		goto cleanup;
-	}
-
-	blkdev->gd->queue = blk_init_queue(blkvsc_request, &blkdev->lock);
-
-	blk_queue_max_segment_size(blkdev->gd->queue, PAGE_SIZE);
-	blk_queue_max_segments(blkdev->gd->queue, MAX_MULTIPAGE_BUFFER_COUNT);
-	blk_queue_segment_boundary(blkdev->gd->queue, PAGE_SIZE-1);
-	blk_queue_bounce_limit(blkdev->gd->queue, BLK_BOUNCE_ANY);
-	blk_queue_dma_alignment(blkdev->gd->queue, 511);
-
-	blkdev->gd->major = major_info.major;
-	if (major_info.index == 1 || major_info.index == 3)
-		blkdev->gd->first_minor = BLKVSC_MINORS;
-	else
-		blkdev->gd->first_minor = 0;
-	blkdev->gd->fops = &block_ops;
-	blkdev->gd->private_data = blkdev;
-	blkdev->gd->driverfs_dev = &(blkdev->device_ctx->device);
-	sprintf(blkdev->gd->disk_name, "hd%c", 'a' + major_info.index);
-
-	blkvsc_do_operation(blkdev, DO_INQUIRY);
-	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);
-	/* go! */
-	add_disk(blkdev->gd);
-
-	DPRINT_INFO(BLKVSC_DRV, "%s added!! capacity %lu sector_size %d",
-		    blkdev->gd->disk_name, (unsigned long)blkdev->capacity,
-		    blkdev->sector_size);
-
-	return ret;
-
-remove:
-	storvsc_dev_remove(dev);
-
-cleanup:
-	if (blkdev) {
-		if (blkdev->request_pool) {
-			kmem_cache_destroy(blkdev->request_pool);
-			blkdev->request_pool = NULL;
-		}
-		kfree(blkdev);
-		blkdev = NULL;
-	}
-
-	return ret;
-}
-
-static void blkvsc_request_completion(struct hv_storvsc_request *request)
-{
-	struct blkvsc_request *blkvsc_req =
-			(struct blkvsc_request *)request->context;
-	struct block_device_context *blkdev =
-			(struct block_device_context *)blkvsc_req->dev;
-	unsigned long flags;
-	struct blkvsc_request *comp_req, *tmp;
-	struct vmscsi_request *vm_srb;
-
-
-	spin_lock_irqsave(&blkdev->lock, flags);
-
-	blkdev->num_outstanding_reqs--;
-	blkvsc_req->group->outstanding--;
-
-	/*
-	 * Only start processing when all the blkvsc_reqs are
-	 * completed. This guarantees no out-of-order blkvsc_req
-	 * completion when calling end_that_request_first()
-	 */
-	if (blkvsc_req->group->outstanding == 0) {
-		list_for_each_entry_safe(comp_req, tmp,
-					 &blkvsc_req->group->blkvsc_req_list,
-					 req_entry) {
-
-			list_del(&comp_req->req_entry);
-
-			vm_srb =
-			&comp_req->request.vstor_packet.vm_srb;
-			if (!__blk_end_request(comp_req->req,
-				(!vm_srb->scsi_status ? 0 : -EIO),
-				comp_req->sector_count * blkdev->sector_size)) {
-				/*
-				 * All the sectors have been xferred ie the
-				 * request is done
-				 */
-				kmem_cache_free(blkdev->request_pool,
-						comp_req->group);
-			}
-
-			kmem_cache_free(blkdev->request_pool, comp_req);
-		}
-
-		if (!blkdev->shutting_down) {
-			blkvsc_do_pending_reqs(blkdev);
-			blk_start_queue(blkdev->gd->queue);
-			blkvsc_request(blkdev->gd->queue);
-		}
-	}
-
-	spin_unlock_irqrestore(&blkdev->lock, flags);
-}
-
-static void __exit blkvsc_exit(void)
-{
-	blkvsc_drv_exit();
-}
-
-MODULE_LICENSE("GPL");
-MODULE_VERSION(HV_DRV_VERSION);
-MODULE_DESCRIPTION("Microsoft Hyper-V virtual block driver");
-module_init(blkvsc_drv_init);
-module_exit(blkvsc_exit);
-- 
1.7.4.1

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