+++ /dev/null
-From 582e26118ab754a3bca9b98351cb874f22b76ffd Mon Sep 17 00:00:00 2001
-From: Hank Janssen <hjanssen@microsoft.com>
-Date: Mon, 13 Jul 2009 15:33:02 -0700
-Subject: Staging: hv: add the Hyper-V virtual block driver
-
-From: Hank Janssen <hjanssen@microsoft.com>
-
-This is the virtual block driver when running Linux on top of Hyper-V.
-
-Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
-Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
-Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
----
- drivers/staging/hv/BlkVsc.c | 107 ++
- drivers/staging/hv/blkvsc_drv.c | 1547 ++++++++++++++++++++++++++++++++++++++++
- 2 files changed, 1654 insertions(+)
- create mode 100644 drivers/staging/hv/blkvsc.c
-
---- /dev/null
-+++ b/drivers/staging/hv/BlkVsc.c
-@@ -0,0 +1,107 @@
-+/*
-+ *
-+ * 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:
-+ * Hank Janssen <hjanssen@microsoft.com>
-+ *
-+ */
-+
-+
-+#include "../storvsc/StorVsc.c"
-+
-+static const char* gBlkDriverName="blkvsc";
-+
-+//{32412632-86cb-44a2-9b5c-50d1417354f5}
-+static const GUID gBlkVscDeviceType={
-+ .Data = {0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44, 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5}
-+};
-+
-+// Static routines
-+static int
-+BlkVscOnDeviceAdd(
-+ DEVICE_OBJECT *Device,
-+ void *AdditionalInfo
-+ );
-+
-+
-+int
-+BlkVscInitialize(
-+ DRIVER_OBJECT *Driver
-+ )
-+{
-+ STORVSC_DRIVER_OBJECT* storDriver = (STORVSC_DRIVER_OBJECT*)Driver;
-+ int ret=0;
-+
-+ DPRINT_ENTER(BLKVSC);
-+
-+ // Make sure we are at least 2 pages since 1 page is used for control
-+ ASSERT(storDriver->RingBufferSize >= (PAGE_SIZE << 1));
-+
-+ Driver->name = gBlkDriverName;
-+ memcpy(&Driver->deviceType, &gBlkVscDeviceType, sizeof(GUID));
-+
-+ storDriver->RequestExtSize = sizeof(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_MULITPAGE_BUFFER + VSTOR_PACKET + UINT64)
-+ storDriver->MaxOutstandingRequestsPerChannel =
-+ ((storDriver->RingBufferSize - PAGE_SIZE) / ALIGN_UP(MAX_MULTIPAGE_BUFFER_PACKET + sizeof(VSTOR_PACKET) + sizeof(UINT64),sizeof(UINT64)));
-+
-+ DPRINT_INFO(BLKVSC, "max io outstd %u", storDriver->MaxOutstandingRequestsPerChannel);
-+
-+ // Setup the dispatch table
-+ storDriver->Base.OnDeviceAdd = BlkVscOnDeviceAdd;
-+ storDriver->Base.OnDeviceRemove = StorVscOnDeviceRemove;
-+ storDriver->Base.OnCleanup = StorVscOnCleanup;
-+
-+ storDriver->OnIORequest = StorVscOnIORequest;
-+
-+ DPRINT_EXIT(BLKVSC);
-+
-+ return ret;
-+}
-+
-+int
-+BlkVscOnDeviceAdd(
-+ DEVICE_OBJECT *Device,
-+ void *AdditionalInfo
-+ )
-+{
-+ int ret=0;
-+ STORVSC_DEVICE_INFO *deviceInfo = (STORVSC_DEVICE_INFO*)AdditionalInfo;
-+
-+ DPRINT_ENTER(BLKVSC);
-+
-+ ret = StorVscOnDeviceAdd(Device, AdditionalInfo);
-+
-+ if (ret != 0)
-+ {
-+ DPRINT_EXIT(BLKVSC);
-+
-+ 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.
-+ deviceInfo->PathId = Device->deviceInstance.Data[3] << 24 | Device->deviceInstance.Data[2] << 16 |
-+ Device->deviceInstance.Data[1] << 8 |Device->deviceInstance.Data[0];
-+
-+ deviceInfo->TargetId = Device->deviceInstance.Data[5] << 8 | Device->deviceInstance.Data[4];
-+
-+ DPRINT_EXIT(BLKVSC);
-+
-+ return ret;
-+}
---- /dev/null
-+++ b/drivers/staging/hv/blkvsc_drv.c
-@@ -0,0 +1,1547 @@
-+/*
-+ *
-+ * 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:
-+ * Hank Janssen <hjanssen@microsoft.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 <scsi/scsi.h>
-+#include <scsi/scsi_cmnd.h>
-+#include <scsi/scsi_eh.h>
-+#include <scsi/scsi_dbg.h>
-+
-+#include "logging.h"
-+#include "vmbus.h"
-+
-+#include "StorVscApi.h"
-+
-+//
-+// #defines
-+//
-+#define BLKVSC_MINORS 64
-+
-+//
-+// Data types
-+//
-+enum blkvsc_device_type {
-+ UNKNOWN_DEV_TYPE,
-+ HARDDISK_TYPE,
-+ DVD_TYPE,
-+};
-+
-+// This request ties the struct request and struct blkvsc_request/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 {
-+ struct list_head req_entry; // blkvsc_request_group.blkvsc_req_list
-+
-+ struct list_head pend_entry; // block_device_context.pending_list
-+
-+ struct request *req; // This may be null if we generate a request internally
-+ struct block_device_context *dev;
-+ struct blkvsc_request_group *group; // The group this request is part of. Maybe null
-+
-+ wait_queue_head_t wevent;
-+ int cond;
-+
-+ 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];
-+
-+ STORVSC_REQUEST request;
-+ // !!!DO NOT ADD ANYTHING BELOW HERE!!! Otherwise, memory can overlap, because -
-+ // The extension buffer falls right here and is pointed to by request.Extension;
-+};
-+
-+// Per device structure
-+struct block_device_context {
-+ struct device_context *device_ctx; // point back to our device context
-+ 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;
-+ int media_not_present;
-+ unsigned int sector_size;
-+ sector_t capacity;
-+ unsigned int port;
-+ unsigned char path;
-+ unsigned char target;
-+ int users;
-+};
-+
-+// Per driver
-+struct blkvsc_driver_context {
-+ // !! These must be the first 2 fields !!
-+ struct driver_context drv_ctx;
-+ STORVSC_DRIVER_OBJECT drv_obj;
-+};
-+
-+// Static decl
-+static int blkvsc_probe(struct device *dev);
-+static int blkvsc_remove(struct device *device);
-+static void blkvsc_shutdown(struct device *device);
-+
-+static int blkvsc_open(struct inode *inode, struct file *filep);
-+static int blkvsc_release(struct inode *inode, struct file *filep);
-+static int blkvsc_media_changed(struct gendisk *gd);
-+static int blkvsc_revalidate_disk(struct gendisk *gd);
-+static int blkvsc_getgeo(struct block_device *bd, struct hd_geometry *hg);
-+static int blkvsc_ioctl(struct inode *inode, struct file *filep, unsigned cmd, unsigned long arg);
-+
-+static void blkvsc_request(struct request_queue *queue);
-+static void blkvsc_request_completion(STORVSC_REQUEST* request);
-+static int blkvsc_do_request(struct block_device_context *blkdev, struct request *req);
-+static int blkvsc_submit_request(struct blkvsc_request *blkvsc_req, void (*request_completion)(STORVSC_REQUEST*) );
-+static void blkvsc_init_rw(struct blkvsc_request *blkvsc_req);
-+static void blkvsc_cmd_completion(STORVSC_REQUEST* request);
-+static int blkvsc_do_inquiry(struct block_device_context *blkdev);
-+static int blkvsc_do_read_capacity(struct block_device_context *blkdev);
-+static int blkvsc_do_read_capacity16(struct block_device_context *blkdev);
-+static int blkvsc_do_flush(struct block_device_context *blkdev);
-+static int blkvsc_cancel_pending_reqs(struct block_device_context *blkdev);
-+static int blkvsc_do_pending_reqs(struct block_device_context *blkdev);
-+
-+
-+static int blkvsc_ringbuffer_size = BLKVSC_RING_BUFFER_SIZE;
-+
-+// The one and only one
-+static struct blkvsc_driver_context g_blkvsc_drv;
-+
-+
-+static struct block_device_operations block_ops =
-+{
-+ .owner = THIS_MODULE,
-+ .open = blkvsc_open,
-+ .release = blkvsc_release,
-+ .media_changed = blkvsc_media_changed,
-+ .revalidate_disk = blkvsc_revalidate_disk,
-+ .getgeo = blkvsc_getgeo,
-+ .ioctl = blkvsc_ioctl,
-+};
-+
-+/*++
-+
-+Name: blkvsc_drv_init()
-+
-+Desc: BlkVsc driver initialization.
-+
-+--*/
-+int blkvsc_drv_init(PFN_DRIVERINITIALIZE pfn_drv_init)
-+{
-+ int ret=0;
-+ STORVSC_DRIVER_OBJECT *storvsc_drv_obj=&g_blkvsc_drv.drv_obj;
-+ struct driver_context *drv_ctx=&g_blkvsc_drv.drv_ctx;
-+
-+ DPRINT_ENTER(BLKVSC_DRV);
-+
-+ vmbus_get_interface(&storvsc_drv_obj->Base.VmbusChannelInterface);
-+
-+ storvsc_drv_obj->RingBufferSize = blkvsc_ringbuffer_size;
-+
-+ // Callback to client driver to complete the initialization
-+ pfn_drv_init(&storvsc_drv_obj->Base);
-+
-+ drv_ctx->driver.name = storvsc_drv_obj->Base.name;
-+ memcpy(&drv_ctx->class_id, &storvsc_drv_obj->Base.deviceType, sizeof(GUID));
-+
-+#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9)
-+ drv_ctx->driver.probe = blkvsc_probe;
-+ drv_ctx->driver.remove = blkvsc_remove;
-+#else
-+ drv_ctx->probe = blkvsc_probe;
-+ drv_ctx->remove = blkvsc_remove;
-+ drv_ctx->shutdown = blkvsc_shutdown;
-+#endif
-+
-+ // The driver belongs to vmbus
-+ vmbus_child_driver_register(drv_ctx);
-+
-+ DPRINT_EXIT(BLKVSC_DRV);
-+
-+ return ret;
-+}
-+
-+
-+static int blkvsc_drv_exit_cb(struct device *dev, void *data)
-+{
-+ struct device **curr = (struct device **)data;
-+ *curr = dev;
-+ return 1; // stop iterating
-+}
-+
-+/*++
-+
-+Name: blkvsc_drv_exit()
-+
-+Desc:
-+
-+--*/
-+void blkvsc_drv_exit(void)
-+{
-+ STORVSC_DRIVER_OBJECT *storvsc_drv_obj=&g_blkvsc_drv.drv_obj;
-+ struct driver_context *drv_ctx=&g_blkvsc_drv.drv_ctx;
-+
-+ struct device *current_dev=NULL;
-+
-+#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9)
-+#define driver_for_each_device(drv, start, data, fn) \
-+ struct list_head *ptr, *n; \
-+ list_for_each_safe(ptr, n, &((drv)->devices)) {\
-+ struct device *curr_dev;\
-+ curr_dev = list_entry(ptr, struct device, driver_list);\
-+ fn(curr_dev, data);\
-+ }
-+#endif // KERNEL_2_6_9
-+
-+ DPRINT_ENTER(BLKVSC_DRV);
-+
-+ while (1)
-+ {
-+ current_dev = NULL;
-+
-+ // Get the device
-+ driver_for_each_device(&drv_ctx->driver, NULL, (void*)¤t_dev, blkvsc_drv_exit_cb);
-+
-+ if (current_dev == NULL)
-+ break;
-+
-+ // Initiate removal from the top-down
-+ device_unregister(current_dev);
-+ }
-+
-+ if (storvsc_drv_obj->Base.OnCleanup)
-+ storvsc_drv_obj->Base.OnCleanup(&storvsc_drv_obj->Base);
-+
-+ vmbus_child_driver_unregister(drv_ctx);
-+
-+ DPRINT_EXIT(BLKVSC_DRV);
-+
-+ return;
-+}
-+
-+/*++
-+
-+Name: blkvsc_probe()
-+
-+Desc: Add a new device for this driver
-+
-+--*/
-+static int blkvsc_probe(struct device *device)
-+{
-+ int ret=0;
-+
-+ struct driver_context *driver_ctx = driver_to_driver_context(device->driver);
-+ struct blkvsc_driver_context *blkvsc_drv_ctx = (struct blkvsc_driver_context*)driver_ctx;
-+ STORVSC_DRIVER_OBJECT* storvsc_drv_obj = &blkvsc_drv_ctx->drv_obj;
-+
-+ struct device_context *device_ctx = device_to_device_context(device);
-+ DEVICE_OBJECT* device_obj = &device_ctx->device_obj;
-+
-+ struct block_device_context *blkdev=NULL;
-+ STORVSC_DEVICE_INFO device_info;
-+ int major=0;
-+ int devnum=0;
-+
-+ static int ide0_registered=0;
-+ static int ide1_registered=0;
-+
-+ DPRINT_ENTER(BLKVSC_DRV);
-+
-+ DPRINT_DBG(BLKVSC_DRV, "blkvsc_probe - enter");
-+
-+ if (!storvsc_drv_obj->Base.OnDeviceAdd)
-+ {
-+ DPRINT_ERR(BLKVSC_DRV, "OnDeviceAdd() not set");
-+
-+ ret = -1;
-+ goto Cleanup;
-+ }
-+
-+ 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);
-+
-+ ASSERT(sizeof(struct blkvsc_request_group) <= sizeof(struct blkvsc_request));
-+
-+#ifdef KERNEL_2_6_27
-+ blkdev->request_pool = kmem_cache_create(device_ctx->device.bus_id,
-+ sizeof(struct blkvsc_request) + storvsc_drv_obj->RequestExtSize, 0,
-+ SLAB_HWCACHE_ALIGN, NULL);
-+#else
-+ blkdev->request_pool = kmem_cache_create(device_ctx->device.bus_id,
-+ sizeof(struct blkvsc_request) + storvsc_drv_obj->RequestExtSize, 0,
-+ SLAB_HWCACHE_ALIGN, NULL, NULL);
-+#endif
-+ if (!blkdev->request_pool)
-+ {
-+ ret = -ENOMEM;
-+ goto Cleanup;
-+ }
-+
-+
-+ // Call to the vsc driver to add the device
-+ ret = storvsc_drv_obj->Base.OnDeviceAdd(device_obj, &device_info);
-+ if (ret != 0)
-+ {
-+ DPRINT_ERR(BLKVSC_DRV, "unable to add blkvsc device");
-+ goto Cleanup;
-+ }
-+
-+ blkdev->device_ctx = device_ctx;
-+ blkdev->target = device_info.TargetId; // this identified the device 0 or 1
-+ blkdev->path = device_info.PathId; // this identified the ide ctrl 0 or 1
-+
-+ device->driver_data = blkdev;
-+
-+ // Calculate the major and device num
-+ if (blkdev->path == 0)
-+ {
-+ major = IDE0_MAJOR;
-+ devnum = blkdev->path + blkdev->target; // 0 or 1
-+
-+ if (!ide0_registered)
-+ {
-+ ret = register_blkdev(major, "ide");
-+ if (ret != 0)
-+ {
-+ DPRINT_ERR(BLKVSC_DRV, "register_blkdev() failed! ret %d", ret);
-+ goto Remove;
-+ }
-+
-+ ide0_registered = 1;
-+ }
-+ }
-+ else if (blkdev->path == 1)
-+ {
-+ major = IDE1_MAJOR;
-+ devnum = blkdev->path + blkdev->target + 1; // 2 or 3
-+
-+ if (!ide1_registered)
-+ {
-+ ret = register_blkdev(major, "ide");
-+ if (ret != 0)
-+ {
-+ DPRINT_ERR(BLKVSC_DRV, "register_blkdev() failed! ret %d", ret);
-+ goto Remove;
-+ }
-+
-+ ide1_registered = 1;
-+ }
-+
-+ }
-+ else
-+ {
-+ DPRINT_ERR(BLKVSC_DRV, "invalid pathid");
-+ ret = -1;
-+ goto Cleanup;
-+ }
-+
-+ DPRINT_INFO(BLKVSC_DRV, "blkvsc registered for major %d!!", major);
-+
-+ blkdev->gd = alloc_disk(BLKVSC_MINORS);
-+ if (!blkdev->gd)
-+ {
-+ DPRINT_ERR(BLKVSC_DRV, "register_blkdev() failed! ret %d", ret);
-+ 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_phys_segments(blkdev->gd->queue, MAX_MULTIPAGE_BUFFER_COUNT);
-+ blk_queue_max_hw_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;
-+ if (devnum == 1 || devnum == 3)
-+ blkdev->gd->first_minor = BLKVSC_MINORS;
-+ else
-+ blkdev->gd->first_minor = 0;
-+ blkdev->gd->fops = &block_ops;
-+ blkdev->gd->private_data = blkdev;
-+ sprintf(blkdev->gd->disk_name, "hd%c", 'a'+ devnum);
-+
-+ blkvsc_do_inquiry(blkdev);
-+ if (blkdev->device_type == DVD_TYPE)
-+ {
-+ set_disk_ro(blkdev->gd, 1);
-+ blkdev->gd->flags |= GENHD_FL_REMOVABLE;
-+ blkvsc_do_read_capacity(blkdev);
-+ }
-+ else
-+ {
-+ blkvsc_do_read_capacity16(blkdev);
-+ }
-+
-+ set_capacity(blkdev->gd, blkdev->capacity * (blkdev->sector_size/512));
-+ blk_queue_hardsect_size(blkdev->gd->queue, blkdev->sector_size);
-+ // go!
-+ add_disk(blkdev->gd);
-+
-+ DPRINT_INFO(BLKVSC_DRV, "%s added!! capacity %llu sector_size %d", blkdev->gd->disk_name, blkdev->capacity, blkdev->sector_size);
-+
-+ return ret;
-+
-+Remove:
-+ storvsc_drv_obj->Base.OnDeviceRemove(device_obj);
-+
-+Cleanup:
-+ if (blkdev)
-+ {
-+ if (blkdev->request_pool)
-+ {
-+ kmem_cache_destroy(blkdev->request_pool);
-+ blkdev->request_pool = NULL;
-+ }
-+ kfree(blkdev);
-+ blkdev = NULL;
-+ }
-+
-+ DPRINT_EXIT(BLKVSC_DRV);
-+
-+ return ret;
-+}
-+
-+static void blkvsc_shutdown(struct device *device)
-+{
-+ struct block_device_context *blkdev = (struct block_device_context*)device->driver_data;
-+ unsigned long flags;
-+
-+ 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;
-+
-+ blk_stop_queue(blkdev->gd->queue);
-+
-+ spin_unlock_irqrestore(&blkdev->lock, flags);
-+
-+ while (blkdev->num_outstanding_reqs)
-+ {
-+ DPRINT_INFO(STORVSC, "waiting for %d requests to complete...", blkdev->num_outstanding_reqs);
-+
-+ udelay(100);
-+ }
-+
-+ blkvsc_do_flush(blkdev);
-+
-+ spin_lock_irqsave(&blkdev->lock, flags);
-+
-+ blkvsc_cancel_pending_reqs(blkdev);
-+
-+ spin_unlock_irqrestore(&blkdev->lock, flags);
-+}
-+
-+static int blkvsc_do_flush(struct block_device_context *blkdev)
-+{
-+ struct blkvsc_request *blkvsc_req=NULL;
-+
-+ DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_flush()\n");
-+
-+ if (blkdev->device_type != HARDDISK_TYPE)
-+ return 0;
-+
-+ blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL);
-+ if (!blkvsc_req)
-+ {
-+ return -ENOMEM;
-+ }
-+
-+ memset(blkvsc_req, 0, sizeof(struct blkvsc_request));
-+ init_waitqueue_head(&blkvsc_req->wevent);
-+ blkvsc_req->dev = blkdev;
-+ blkvsc_req->req = NULL;
-+ blkvsc_req->write = 0;
-+
-+ blkvsc_req->request.DataBuffer.PfnArray[0] = 0;
-+ blkvsc_req->request.DataBuffer.Offset = 0;
-+ blkvsc_req->request.DataBuffer.Length = 0;
-+
-+ blkvsc_req->cmnd[0] = SYNCHRONIZE_CACHE;
-+ blkvsc_req->cmd_len = 10;
-+
-+ // Set this here since the completion routine may be invoked and completed before we return
-+ blkvsc_req->cond =0;
-+ blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion);
-+
-+ wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond);
-+
-+ kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
-+
-+ return 0;
-+}
-+
-+// 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=NULL;
-+ struct page *page_buf;
-+ unsigned char *buf;
-+ unsigned char device_type;
-+
-+ DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_inquiry()\n");
-+
-+ blkvsc_req = kmem_cache_alloc(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_waitqueue_head(&blkvsc_req->wevent);
-+ blkvsc_req->dev = blkdev;
-+ blkvsc_req->req = NULL;
-+ blkvsc_req->write = 0;
-+
-+ blkvsc_req->request.DataBuffer.PfnArray[0] = page_to_pfn(page_buf);
-+ blkvsc_req->request.DataBuffer.Offset = 0;
-+ blkvsc_req->request.DataBuffer.Length = 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;
-+
-+ // Set this here since the completion routine may be invoked and completed before we return
-+ blkvsc_req->cond =0;
-+
-+ blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion);
-+
-+ DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete - cond %d\n", blkvsc_req, blkvsc_req->cond);
-+
-+ wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond);
-+
-+ buf = kmap(page_buf);
-+
-+ //PrintBytes(buf, 64);
-+ // 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);
-+ //PrintBytes(blkdev->device_id, blkdev->device_id_len);
-+
-+ kunmap(page_buf);
-+
-+ __free_page(page_buf);
-+
-+ kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
-+
-+ return 0;
-+}
-+
-+// 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=NULL;
-+ struct page *page_buf;
-+ unsigned char *buf;
-+ struct scsi_sense_hdr sense_hdr;
-+
-+ 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_alloc(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_waitqueue_head(&blkvsc_req->wevent);
-+ blkvsc_req->dev = blkdev;
-+ blkvsc_req->req = NULL;
-+ blkvsc_req->write = 0;
-+
-+ blkvsc_req->request.DataBuffer.PfnArray[0] = page_to_pfn(page_buf);
-+ blkvsc_req->request.DataBuffer.Offset = 0;
-+ blkvsc_req->request.DataBuffer.Length = 8;
-+
-+ blkvsc_req->cmnd[0] = READ_CAPACITY;
-+ blkvsc_req->cmd_len = 16;
-+
-+ // Set this here since the completion routine may be invoked and completed before we return
-+ blkvsc_req->cond =0;
-+
-+ blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion);
-+
-+ DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete - cond %d\n", blkvsc_req, blkvsc_req->cond);
-+
-+ wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond);
-+
-+ // check error
-+ if (blkvsc_req->request.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=NULL;
-+ struct page *page_buf;
-+ unsigned char *buf;
-+ struct scsi_sense_hdr sense_hdr;
-+
-+ 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_alloc(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_waitqueue_head(&blkvsc_req->wevent);
-+ blkvsc_req->dev = blkdev;
-+ blkvsc_req->req = NULL;
-+ blkvsc_req->write = 0;
-+
-+ blkvsc_req->request.DataBuffer.PfnArray[0] = page_to_pfn(page_buf);
-+ blkvsc_req->request.DataBuffer.Offset = 0;
-+ blkvsc_req->request.DataBuffer.Length = 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_req->cond =0;
-+
-+ blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion);
-+
-+ DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete - cond %d\n", blkvsc_req, blkvsc_req->cond);
-+
-+ wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond);
-+
-+ // check error
-+ if (blkvsc_req->request.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]);
-+
-+ //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;
-+}
-+
-+/*++
-+
-+Name: blkvsc_remove()
-+
-+Desc: Callback when our device is removed
-+
-+--*/
-+static int blkvsc_remove(struct device *device)
-+{
-+ int ret=0;
-+
-+ struct driver_context *driver_ctx = driver_to_driver_context(device->driver);
-+ struct blkvsc_driver_context *blkvsc_drv_ctx = (struct blkvsc_driver_context*)driver_ctx;
-+ STORVSC_DRIVER_OBJECT* storvsc_drv_obj = &blkvsc_drv_ctx->drv_obj;
-+
-+ struct device_context *device_ctx = device_to_device_context(device);
-+ DEVICE_OBJECT* device_obj = &device_ctx->device_obj;
-+ struct block_device_context *blkdev = (struct block_device_context*)device->driver_data;
-+ unsigned long flags;
-+
-+ DPRINT_ENTER(BLKVSC_DRV);
-+
-+ DPRINT_DBG(BLKVSC_DRV, "blkvsc_remove()\n");
-+
-+ if (!storvsc_drv_obj->Base.OnDeviceRemove)
-+ {
-+ DPRINT_EXIT(BLKVSC_DRV);
-+ return -1;
-+ }
-+
-+ // Call to the vsc driver to let it know that the device is being removed
-+ ret = storvsc_drv_obj->Base.OnDeviceRemove(device_obj);
-+ if (ret != 0)
-+ {
-+ // TODO:
-+ DPRINT_ERR(BLKVSC_DRV, "unable to remove blkvsc device (ret %d)", ret);
-+ }
-+
-+ // Get to a known state
-+ spin_lock_irqsave(&blkdev->lock, flags);
-+
-+ blkdev->shutting_down = 1;
-+
-+ blk_stop_queue(blkdev->gd->queue);
-+
-+ spin_unlock_irqrestore(&blkdev->lock, flags);
-+
-+ while (blkdev->num_outstanding_reqs)
-+ {
-+ DPRINT_INFO(STORVSC, "waiting for %d requests to complete...", blkdev->num_outstanding_reqs);
-+
-+ udelay(100);
-+ }
-+
-+ blkvsc_do_flush(blkdev);
-+
-+ spin_lock_irqsave(&blkdev->lock, flags);
-+
-+ blkvsc_cancel_pending_reqs(blkdev);
-+
-+ spin_unlock_irqrestore(&blkdev->lock, flags);
-+
-+ blk_cleanup_queue(blkdev->gd->queue);
-+
-+ del_gendisk(blkdev->gd);
-+
-+ kmem_cache_destroy(blkdev->request_pool);
-+
-+ kfree(blkdev);
-+
-+ DPRINT_EXIT(BLKVSC_DRV);
-+
-+ return ret;
-+}
-+
-+static void blkvsc_init_rw(struct blkvsc_request *blkvsc_req)
-+{
-+ ASSERT(blkvsc_req->req);
-+ ASSERT(blkvsc_req->sector_count <= (MAX_MULTIPAGE_BUFFER_COUNT*8));
-+
-+ 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] |= blk_fua_rq(blkvsc_req->req) ? 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] |= blk_fua_rq(blkvsc_req->req) ? 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);
-+ }
-+ 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;
-+ }
-+}
-+
-+static int blkvsc_submit_request(struct blkvsc_request *blkvsc_req, void (*request_completion)(STORVSC_REQUEST*) )
-+{
-+ struct block_device_context *blkdev = blkvsc_req->dev;
-+ struct device_context *device_ctx=blkdev->device_ctx;
-+ struct driver_context *driver_ctx = driver_to_driver_context(device_ctx->device.driver);
-+ struct blkvsc_driver_context *blkvsc_drv_ctx = (struct blkvsc_driver_context*)driver_ctx;
-+ STORVSC_DRIVER_OBJECT* storvsc_drv_obj = &blkvsc_drv_ctx->drv_obj;
-+ int ret =0;
-+
-+ STORVSC_REQUEST *storvsc_req;
-+
-+ DPRINT_DBG(BLKVSC_DRV, "blkvsc_submit_request() - req %p type %s start_sector %llu count %d offset %d len %d\n",
-+ blkvsc_req,
-+ (blkvsc_req->write)?"WRITE":"READ",
-+ blkvsc_req->sector_start,
-+ blkvsc_req->sector_count,
-+ blkvsc_req->request.DataBuffer.Offset,
-+ blkvsc_req->request.DataBuffer.Length);
-+
-+ /*for (i=0; i < (blkvsc_req->request.DataBuffer.Length >> 12); i++)
-+ {
-+ DPRINT_DBG(BLKVSC_DRV, "blkvsc_submit_request() - req %p pfn[%d] %llx\n",
-+ blkvsc_req,
-+ i,
-+ blkvsc_req->request.DataBuffer.PfnArray[i]);
-+ }*/
-+
-+ storvsc_req = &blkvsc_req->request;
-+ storvsc_req->Extension = (void*)((unsigned long)blkvsc_req + sizeof(struct blkvsc_request));
-+
-+ storvsc_req->Type = blkvsc_req->write? WRITE_TYPE : READ_TYPE;
-+
-+ storvsc_req->OnIOCompletion = request_completion;
-+ storvsc_req->Context = blkvsc_req;
-+
-+ storvsc_req->Host = blkdev->port;
-+ storvsc_req->Bus = blkdev->path;
-+ storvsc_req->TargetId = blkdev->target;
-+ storvsc_req->LunId = 0; // this is not really used at all
-+
-+ storvsc_req->CdbLen = blkvsc_req->cmd_len;
-+ storvsc_req->Cdb = blkvsc_req->cmnd;
-+
-+ storvsc_req->SenseBuffer = blkvsc_req->sense_buffer;
-+ storvsc_req->SenseBufferSize = SCSI_SENSE_BUFFERSIZE;
-+
-+ ret = storvsc_drv_obj->OnIORequest(&blkdev->device_ctx->device_obj, &blkvsc_req->request);
-+ if (ret == 0)
-+ {
-+ blkdev->num_outstanding_reqs++;
-+ }
-+
-+ return ret;
-+}
-+
-+//
-+// 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;
-+
-+ DPRINT_DBG(BLKVSC_DRV, "blkdev %p req %p sect %llu \n", blkdev, req, req->sector);
-+
-+ // Create a group to tie req to list of blkvsc_reqs
-+ group = (struct blkvsc_request_group*)kmem_cache_alloc(blkdev->request_pool, GFP_ATOMIC);
-+ if (!group)
-+ {
-+ return -ENOMEM;
-+ }
-+
-+ INIT_LIST_HEAD(&group->blkvsc_req_list);
-+ group->outstanding = group->status = 0;
-+
-+ start_sector = req->sector;
-+
-+ // 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)
-+ {
-+ 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
-+ if ( (!blkvsc_req) || // 1st-time
-+ (databuf_idx >= MAX_MULTIPAGE_BUFFER_COUNT) ||
-+ (bvec->bv_offset != 0) || // hole at the begin of page
-+ (prev_bvec && (prev_bvec->bv_len != PAGE_SIZE)) ) // hold at the end of page
-+ {
-+ // 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_alloc(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.DataBuffer.Offset = bvec->bv_offset;
-+ blkvsc_req->request.DataBuffer.Length = 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.DataBuffer.PfnArray[databuf_idx] = page_to_pfn(bvec->bv_page);
-+ blkvsc_req->request.DataBuffer.Length += 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)
-+ {
-+ 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));
-+
-+ 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)
-+ {
-+ DPRINT_DBG(BLKVSC_DRV, "adding blkvsc_req to pending_list - blkvsc_req %p start_sect %llu sect_count %d (%llu %d)\n",
-+ blkvsc_req, blkvsc_req->sector_start, blkvsc_req->sector_count, start_sector, num_sectors);
-+
-+ list_add_tail(&blkvsc_req->pend_entry, &blkdev->pending_list);
-+ }
-+ else
-+ {
-+ ret = blkvsc_submit_request(blkvsc_req, blkvsc_request_completion);
-+ if (ret == -1)
-+ {
-+ pending = 1;
-+ list_add_tail(&blkvsc_req->pend_entry, &blkdev->pending_list);
-+ }
-+
-+ DPRINT_DBG(BLKVSC_DRV, "submitted blkvsc_req %p start_sect %llu sect_count %d (%llu %d) ret %d\n",
-+ blkvsc_req, blkvsc_req->sector_start, blkvsc_req->sector_count, start_sector, num_sectors, ret);
-+ }
-+ }
-+
-+ return pending;
-+}
-+
-+static void blkvsc_cmd_completion(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;
-+
-+ DPRINT_DBG(BLKVSC_DRV, "blkvsc_cmd_completion() - req %p\n", blkvsc_req);
-+
-+ blkdev->num_outstanding_reqs--;
-+
-+ if (blkvsc_req->request.Status)
-+ {
-+ if (scsi_normalize_sense(blkvsc_req->sense_buffer, SCSI_SENSE_BUFFERSIZE, &sense_hdr))
-+ {
-+ scsi_print_sense_hdr("blkvsc", &sense_hdr);
-+ }
-+ }
-+
-+ blkvsc_req->cond =1;
-+ wake_up_interruptible(&blkvsc_req->wevent);
-+}
-+
-+static void blkvsc_request_completion(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;
-+
-+ ASSERT(blkvsc_req->group);
-+
-+ DPRINT_DBG(BLKVSC_DRV, "blkdev %p blkvsc_req %p group %p type %s sect_start %llu sect_count %d len %d group outstd %d total outstd %d\n",
-+ blkdev,
-+ blkvsc_req,
-+ blkvsc_req->group,
-+ (blkvsc_req->write)?"WRITE":"READ",
-+ blkvsc_req->sector_start,
-+ blkvsc_req->sector_count,
-+ blkvsc_req->request.DataBuffer.Length,
-+ blkvsc_req->group->outstanding,
-+ blkdev->num_outstanding_reqs);
-+
-+ 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)
-+ {
-+ DPRINT_DBG(BLKVSC_DRV, "completing blkvsc_req %p sect_start %llu sect_count %d \n",
-+ comp_req,
-+ comp_req->sector_start,
-+ comp_req->sector_count);
-+
-+ list_del(&comp_req->req_entry);
-+
-+#ifdef KERNEL_2_6_27
-+ if (!__blk_end_request(
-+ comp_req->req,
-+ (!comp_req->request.Status ? 0: -EIO),
-+ comp_req->sector_count * blkdev->sector_size))
-+ {
-+ //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);
-+ }
-+#else
-+ if (!end_that_request_first(comp_req->req, !comp_req->request.Status, (comp_req->sector_count * (blkdev->sector_size >> 9))))
-+ {
-+ //All the sectors have been xferred ie the request is done
-+ DPRINT_DBG(BLKVSC_DRV, "req %p COMPLETED\n", comp_req->req);
-+
-+ end_that_request_last(comp_req->req, !comp_req->request.Status);
-+
-+ kmem_cache_free(blkdev->request_pool, comp_req->group);
-+ }
-+#endif
-+
-+ 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 int blkvsc_cancel_pending_reqs(struct block_device_context *blkdev)
-+{
-+ struct blkvsc_request *pend_req, *tmp;
-+ struct blkvsc_request *comp_req, *tmp2;
-+
-+ 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, 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)
-+ {
-+ DPRINT_DBG(BLKVSC_DRV, "completing blkvsc_req %p sect_start %llu sect_count %d \n",
-+ comp_req,
-+ comp_req->sector_start,
-+ comp_req->sector_count);
-+
-+ if (comp_req == pend_req)
-+ break;
-+
-+ list_del(&comp_req->req_entry);
-+
-+ if (comp_req->req)
-+ {
-+#ifdef KERNEL_2_6_27
-+ ret = __blk_end_request(
-+ comp_req->req,
-+ (!comp_req->request.Status ? 0 : -EIO),
-+ comp_req->sector_count * blkdev->sector_size);
-+#else
-+ ret = end_that_request_first(comp_req->req, !comp_req->request.Status, (comp_req->sector_count * (blkdev->sector_size >> 9)));
-+#endif
-+ ASSERT(ret != 0);
-+ }
-+
-+ 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);
-+
-+ if (comp_req->req)
-+ {
-+#ifdef KERNEL_2_6_27
-+ 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
-+ DPRINT_DBG(BLKVSC_DRV, "blkvsc_cancel_pending_reqs() - req %p COMPLETED\n", pend_req->req);
-+ kmem_cache_free(blkdev->request_pool, pend_req->group);
-+ }
-+#else
-+ if (!end_that_request_first(pend_req->req, 0, (pend_req->sector_count * (blkdev->sector_size >> 9))))
-+ {
-+ //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);
-+
-+ end_that_request_last(pend_req->req, 0);
-+
-+ kmem_cache_free(blkdev->request_pool, pend_req->group);
-+ }
-+#endif
-+ }
-+
-+ kmem_cache_free(blkdev->request_pool, pend_req);
-+ }
-+
-+ return ret;
-+}
-+
-+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)
-+ {
-+ DPRINT_DBG(BLKVSC_DRV, "working off pending_list - %p\n", pend_req);
-+
-+ 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;
-+
-+ DPRINT_DBG(BLKVSC_DRV, "- enter \n");
-+ while ((req = elv_next_request(queue)) != NULL)
-+ {
-+ DPRINT_DBG(BLKVSC_DRV, "- req %p\n", req);
-+
-+ blkdev = req->rq_disk->private_data;
-+ if (blkdev->shutting_down || !blk_fs_request(req) || blkdev->media_not_present) {
-+ end_request(req, 0);
-+ continue;
-+ }
-+
-+ 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;
-+ }
-+
-+ blkdev_dequeue_request(req);
-+
-+ 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;
-+ }
-+ }
-+}
-+
-+static int blkvsc_open(struct inode *inode, struct file *filep)
-+{
-+ struct block_device_context *blkdev = inode->i_bdev->bd_disk->private_data;
-+
-+ DPRINT_DBG(BLKVSC_DRV, "- users %d disk %s\n", blkdev->users, blkdev->gd->disk_name);
-+
-+ spin_lock(&blkdev->lock);
-+
-+ if (!blkdev->users && blkdev->device_type == DVD_TYPE)
-+ {
-+ spin_unlock(&blkdev->lock);
-+ check_disk_change(inode->i_bdev);
-+ spin_lock(&blkdev->lock);
-+ }
-+
-+ blkdev->users++;
-+
-+ spin_unlock(&blkdev->lock);
-+ return 0;
-+}
-+
-+static int blkvsc_release(struct inode *inode, struct file *filep)
-+{
-+ struct block_device_context *blkdev = inode->i_bdev->bd_disk->private_data;
-+
-+ DPRINT_DBG(BLKVSC_DRV, "- users %d disk %s\n", blkdev->users, blkdev->gd->disk_name);
-+
-+ spin_lock(&blkdev->lock);
-+ if (blkdev->users == 1)
-+ {
-+ spin_unlock(&blkdev->lock);
-+ blkvsc_do_flush(blkdev);
-+ spin_lock(&blkdev->lock);
-+ }
-+
-+ blkdev->users--;
-+
-+ spin_unlock(&blkdev->lock);
-+ return 0;
-+}
-+
-+static int blkvsc_media_changed(struct gendisk *gd)
-+{
-+ DPRINT_DBG(BLKVSC_DRV, "- enter\n");
-+
-+ return 1;
-+}
-+
-+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_read_capacity(blkdev);
-+ set_capacity(blkdev->gd, blkdev->capacity * (blkdev->sector_size/512));
-+ blk_queue_hardsect_size(gd->queue, blkdev->sector_size);
-+ }
-+ return 0;
-+}
-+
-+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;
-+
-+ 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;
-+ rem = sector_div(cylinder_times_heads, sectors_per_track); // sector_div stores the quotient in cylinder_times_heads
-+ }
-+ else
-+ {
-+ sectors_per_track = 17;
-+
-+ cylinder_times_heads = total_sectors;
-+ rem = sector_div(cylinder_times_heads, sectors_per_track); // sector_div stores the quotient in cylinder_times_heads
-+
-+ temp = cylinder_times_heads + 1023;
-+ rem = sector_div(temp, 1024); // sector_div stores the quotient in temp
-+
-+ 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;
-+ rem = sector_div(cylinder_times_heads, sectors_per_track); // sector_div stores the quotient in cylinder_times_heads
-+ }
-+
-+ if (cylinder_times_heads >= (heads * 1024)) {
-+ sectors_per_track = 63;
-+ heads = 16;
-+
-+ cylinder_times_heads = total_sectors;
-+ rem = sector_div(cylinder_times_heads, sectors_per_track); // sector_div stores the quotient in cylinder_times_heads
-+ }
-+ }
-+
-+ temp = cylinder_times_heads;
-+ rem = sector_div(temp, heads); // sector_div stores the quotient in temp
-+ cylinders = temp;
-+
-+ hg->heads = heads;
-+ hg->sectors = sectors_per_track;
-+ hg->cylinders = cylinders;
-+
-+ DPRINT_INFO(BLKVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads, sectors_per_track);
-+
-+ return 0;
-+}
-+
-+static int blkvsc_ioctl(struct inode *inode, struct file *filep, unsigned cmd, unsigned long arg)
-+{
-+ struct block_device *bd = inode->i_bdev;
-+ 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.
-+ /*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;*/
-+ default:
-+ ret = -EINVAL;
-+ break;
-+ }
-+
-+ return ret;
-+}
-+
-+
-+MODULE_LICENSE("GPL");
-+
-+static int __init blkvsc_init(void)
-+{
-+ int ret;
-+
-+ ASSERT(sizeof(sector_t) == 8); // Make sure CONFIG_LBD is set
-+
-+ DPRINT_ENTER(BLKVSC_DRV);
-+
-+ DPRINT_INFO(BLKVSC_DRV, "Blkvsc initializing....");
-+
-+ ret = blkvsc_drv_init(BlkVscInitialize);
-+
-+ DPRINT_EXIT(BLKVSC_DRV);
-+
-+ return ret;
-+}
-+
-+static void __exit blkvsc_exit(void)
-+{
-+ DPRINT_ENTER(BLKVSC_DRV);
-+
-+ blkvsc_drv_exit();
-+
-+ DPRINT_ENTER(BLKVSC_DRV);
-+}
-+
-+module_param(blkvsc_ringbuffer_size, int, S_IRUGO);
-+
-+module_init(blkvsc_init);
-+module_exit(blkvsc_exit);
-+
-+// eof
projects / people / pmueller / ipfire-2.x.git / blobdiff