From: Hank Janssen <hjanssen@xxxxxxxxxxxxx>
This is the virtual block driver when running Linux on top of Hyper-V.
Signed-off-by: Hank Janssen <hjanssen@xxxxxxxxxxxxx>
Signed-off-by: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
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@xxxxxxxxxxxxx>
+ *
+ */
+
+
+#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@xxxxxxxxxxxxx>
+ *
+ */
+
+
+#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
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