1101 lines
25 KiB
C
1101 lines
25 KiB
C
/*
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* Copyright (c) 2009, Microsoft Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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*
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* Authors:
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* Haiyang Zhang <haiyangz@microsoft.com>
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* Hank Janssen <hjanssen@microsoft.com>
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* K. Y. Srinivasan <kys@microsoft.com>
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/blkdev.h>
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#include <linux/major.h>
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#include <linux/delay.h>
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#include <linux/hdreg.h>
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#include <linux/slab.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_eh.h>
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#include <scsi/scsi_dbg.h>
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#include "hv_api.h"
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#include "logging.h"
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#include "version_info.h"
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#include "vmbus.h"
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#include "storvsc_api.h"
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#define BLKVSC_MINORS 64
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enum blkvsc_device_type {
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UNKNOWN_DEV_TYPE,
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HARDDISK_TYPE,
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DVD_TYPE,
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};
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enum blkvsc_op_type {
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DO_INQUIRY,
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DO_CAPACITY,
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DO_FLUSH,
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};
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/*
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* This request ties the struct request and struct
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* blkvsc_request/hv_storvsc_request together A struct request may be
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* represented by 1 or more struct blkvsc_request
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*/
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struct blkvsc_request_group {
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int outstanding;
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int status;
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struct list_head blkvsc_req_list; /* list of blkvsc_requests */
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};
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struct blkvsc_request {
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/* blkvsc_request_group.blkvsc_req_list */
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struct list_head req_entry;
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/* block_device_context.pending_list */
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struct list_head pend_entry;
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/* This may be null if we generate a request internally */
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struct request *req;
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struct block_device_context *dev;
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/* The group this request is part of. Maybe null */
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struct blkvsc_request_group *group;
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int write;
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sector_t sector_start;
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unsigned long sector_count;
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unsigned char sense_buffer[SCSI_SENSE_BUFFERSIZE];
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unsigned char cmd_len;
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unsigned char cmnd[MAX_COMMAND_SIZE];
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struct hv_storvsc_request request;
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};
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/* Per device structure */
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struct block_device_context {
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/* point back to our device context */
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struct hv_device *device_ctx;
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struct kmem_cache *request_pool;
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spinlock_t lock;
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struct gendisk *gd;
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enum blkvsc_device_type device_type;
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struct list_head pending_list;
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unsigned char device_id[64];
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unsigned int device_id_len;
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int num_outstanding_reqs;
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int shutting_down;
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unsigned int sector_size;
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sector_t capacity;
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unsigned int port;
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unsigned char path;
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unsigned char target;
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int users;
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};
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static const char *drv_name = "blkvsc";
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/* {32412632-86cb-44a2-9b5c-50d1417354f5} */
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static const struct hv_guid dev_type = {
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.data = {
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0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
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0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5
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}
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};
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/*
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* There is a circular dependency involving blkvsc_request_completion()
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* and blkvsc_do_request().
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*/
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static void blkvsc_request_completion(struct hv_storvsc_request *request);
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static int blkvsc_ringbuffer_size = BLKVSC_RING_BUFFER_SIZE;
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module_param(blkvsc_ringbuffer_size, int, S_IRUGO);
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MODULE_PARM_DESC(ring_size, "Ring buffer size (in bytes)");
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/*
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* There is a circular dependency involving blkvsc_probe()
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* and block_ops.
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*/
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static int blkvsc_probe(struct hv_device *dev);
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static int blkvsc_device_add(struct hv_device *device,
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void *additional_info)
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{
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struct storvsc_device_info *device_info;
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int ret = 0;
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device_info = (struct storvsc_device_info *)additional_info;
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ret = storvsc_dev_add(device, additional_info);
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if (ret != 0)
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return ret;
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/*
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* We need to use the device instance guid to set the path and target
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* id. For IDE devices, the device instance id is formatted as
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* <bus id> * - <device id> - 8899 - 000000000000.
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*/
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device_info->path_id = device->dev_instance.data[3] << 24 |
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device->dev_instance.data[2] << 16 |
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device->dev_instance.data[1] << 8 |
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device->dev_instance.data[0];
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device_info->target_id = device->dev_instance.data[5] << 8 |
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device->dev_instance.data[4];
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return ret;
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}
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static int blk_vsc_initialize(struct hv_driver *driver)
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{
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struct storvsc_driver *stor_driver;
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int ret = 0;
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stor_driver = hvdr_to_stordr(driver);
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/* Make sure we are at least 2 pages since 1 page is used for control */
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driver->name = drv_name;
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memcpy(&driver->dev_type, &dev_type, sizeof(struct hv_guid));
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/*
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* Divide the ring buffer data size (which is 1 page less than the ring
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* buffer size since that page is reserved for the ring buffer indices)
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* by the max request size (which is
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* vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64)
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*/
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stor_driver->max_outstanding_req_per_channel =
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((stor_driver->ring_buffer_size - PAGE_SIZE) /
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ALIGN(MAX_MULTIPAGE_BUFFER_PACKET +
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sizeof(struct vstor_packet) + sizeof(u64),
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sizeof(u64)));
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DPRINT_INFO(BLKVSC, "max io outstd %u",
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stor_driver->max_outstanding_req_per_channel);
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return ret;
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}
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static int blkvsc_submit_request(struct blkvsc_request *blkvsc_req,
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void (*request_completion)(struct hv_storvsc_request *))
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{
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struct block_device_context *blkdev = blkvsc_req->dev;
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struct hv_storvsc_request *storvsc_req;
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struct vmscsi_request *vm_srb;
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int ret;
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storvsc_req = &blkvsc_req->request;
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vm_srb = &storvsc_req->vstor_packet.vm_srb;
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vm_srb->data_in = blkvsc_req->write ? WRITE_TYPE : READ_TYPE;
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storvsc_req->on_io_completion = request_completion;
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storvsc_req->context = blkvsc_req;
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vm_srb->port_number = blkdev->port;
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vm_srb->path_id = blkdev->path;
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vm_srb->target_id = blkdev->target;
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vm_srb->lun = 0; /* this is not really used at all */
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vm_srb->cdb_length = blkvsc_req->cmd_len;
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memcpy(vm_srb->cdb, blkvsc_req->cmnd, vm_srb->cdb_length);
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storvsc_req->sense_buffer = blkvsc_req->sense_buffer;
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ret = storvsc_do_io(blkdev->device_ctx,
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&blkvsc_req->request);
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if (ret == 0)
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blkdev->num_outstanding_reqs++;
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return ret;
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}
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static int blkvsc_open(struct block_device *bdev, fmode_t mode)
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{
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struct block_device_context *blkdev = bdev->bd_disk->private_data;
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unsigned long flags;
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spin_lock_irqsave(&blkdev->lock, flags);
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blkdev->users++;
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spin_unlock_irqrestore(&blkdev->lock, flags);
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return 0;
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}
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static int blkvsc_getgeo(struct block_device *bd, struct hd_geometry *hg)
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{
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sector_t nsect = get_capacity(bd->bd_disk);
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sector_t cylinders = nsect;
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/*
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* We are making up these values; let us keep it simple.
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*/
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hg->heads = 0xff;
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hg->sectors = 0x3f;
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sector_div(cylinders, hg->heads * hg->sectors);
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hg->cylinders = cylinders;
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if ((sector_t)(hg->cylinders + 1) * hg->heads * hg->sectors < nsect)
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hg->cylinders = 0xffff;
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return 0;
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}
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static void blkvsc_init_rw(struct blkvsc_request *blkvsc_req)
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{
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blkvsc_req->cmd_len = 16;
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if (rq_data_dir(blkvsc_req->req)) {
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blkvsc_req->write = 1;
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blkvsc_req->cmnd[0] = WRITE_16;
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} else {
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blkvsc_req->write = 0;
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blkvsc_req->cmnd[0] = READ_16;
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}
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blkvsc_req->cmnd[1] |=
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(blkvsc_req->req->cmd_flags & REQ_FUA) ? 0x8 : 0;
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*(unsigned long long *)&blkvsc_req->cmnd[2] =
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cpu_to_be64(blkvsc_req->sector_start);
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*(unsigned int *)&blkvsc_req->cmnd[10] =
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cpu_to_be32(blkvsc_req->sector_count);
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}
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static int blkvsc_ioctl(struct block_device *bd, fmode_t mode,
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unsigned cmd, unsigned long arg)
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{
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struct block_device_context *blkdev = bd->bd_disk->private_data;
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int ret = 0;
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switch (cmd) {
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case HDIO_GET_IDENTITY:
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if (copy_to_user((void __user *)arg, blkdev->device_id,
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blkdev->device_id_len))
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ret = -EFAULT;
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static void blkvsc_cmd_completion(struct hv_storvsc_request *request)
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{
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struct blkvsc_request *blkvsc_req =
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(struct blkvsc_request *)request->context;
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struct block_device_context *blkdev =
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(struct block_device_context *)blkvsc_req->dev;
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struct scsi_sense_hdr sense_hdr;
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struct vmscsi_request *vm_srb;
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unsigned long flags;
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vm_srb = &blkvsc_req->request.vstor_packet.vm_srb;
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spin_lock_irqsave(&blkdev->lock, flags);
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blkdev->num_outstanding_reqs--;
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spin_unlock_irqrestore(&blkdev->lock, flags);
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if (vm_srb->scsi_status)
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if (scsi_normalize_sense(blkvsc_req->sense_buffer,
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SCSI_SENSE_BUFFERSIZE, &sense_hdr))
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scsi_print_sense_hdr("blkvsc", &sense_hdr);
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complete(&blkvsc_req->request.wait_event);
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}
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static int blkvsc_do_operation(struct block_device_context *blkdev,
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enum blkvsc_op_type op)
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{
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struct blkvsc_request *blkvsc_req;
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struct page *page_buf;
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unsigned char *buf;
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unsigned char device_type;
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struct scsi_sense_hdr sense_hdr;
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struct vmscsi_request *vm_srb;
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unsigned long flags;
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int ret = 0;
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blkvsc_req = kmem_cache_zalloc(blkdev->request_pool, GFP_KERNEL);
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if (!blkvsc_req)
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return -ENOMEM;
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page_buf = alloc_page(GFP_KERNEL);
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if (!page_buf) {
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kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
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return -ENOMEM;
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}
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vm_srb = &blkvsc_req->request.vstor_packet.vm_srb;
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init_completion(&blkvsc_req->request.wait_event);
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blkvsc_req->dev = blkdev;
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blkvsc_req->req = NULL;
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blkvsc_req->write = 0;
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blkvsc_req->request.data_buffer.pfn_array[0] =
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page_to_pfn(page_buf);
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blkvsc_req->request.data_buffer.offset = 0;
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switch (op) {
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case DO_INQUIRY:
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blkvsc_req->cmnd[0] = INQUIRY;
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blkvsc_req->cmnd[1] = 0x1; /* Get product data */
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blkvsc_req->cmnd[2] = 0x83; /* mode page 83 */
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blkvsc_req->cmnd[4] = 64;
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blkvsc_req->cmd_len = 6;
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blkvsc_req->request.data_buffer.len = 64;
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break;
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case DO_CAPACITY:
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blkdev->sector_size = 0;
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blkdev->capacity = 0;
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blkvsc_req->cmnd[0] = READ_CAPACITY;
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blkvsc_req->cmd_len = 16;
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blkvsc_req->request.data_buffer.len = 8;
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break;
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case DO_FLUSH:
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blkvsc_req->cmnd[0] = SYNCHRONIZE_CACHE;
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blkvsc_req->cmd_len = 10;
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blkvsc_req->request.data_buffer.pfn_array[0] = 0;
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blkvsc_req->request.data_buffer.len = 0;
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break;
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default:
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ret = -EINVAL;
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goto cleanup;
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}
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spin_lock_irqsave(&blkdev->lock, flags);
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blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion);
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spin_unlock_irqrestore(&blkdev->lock, flags);
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wait_for_completion_interruptible(&blkvsc_req->request.wait_event);
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/* check error */
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if (vm_srb->scsi_status) {
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scsi_normalize_sense(blkvsc_req->sense_buffer,
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SCSI_SENSE_BUFFERSIZE, &sense_hdr);
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return 0;
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}
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buf = kmap(page_buf);
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switch (op) {
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case DO_INQUIRY:
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device_type = buf[0] & 0x1F;
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if (device_type == 0x0)
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blkdev->device_type = HARDDISK_TYPE;
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else
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blkdev->device_type = UNKNOWN_DEV_TYPE;
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blkdev->device_id_len = buf[7];
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if (blkdev->device_id_len > 64)
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blkdev->device_id_len = 64;
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memcpy(blkdev->device_id, &buf[8], blkdev->device_id_len);
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break;
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case DO_CAPACITY:
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/* be to le */
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blkdev->capacity =
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((buf[0] << 24) | (buf[1] << 16) |
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(buf[2] << 8) | buf[3]) + 1;
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blkdev->sector_size =
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(buf[4] << 24) | (buf[5] << 16) |
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(buf[6] << 8) | buf[7];
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break;
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default:
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break;
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}
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cleanup:
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kunmap(page_buf);
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__free_page(page_buf);
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kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
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return ret;
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}
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static int blkvsc_cancel_pending_reqs(struct block_device_context *blkdev)
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{
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struct blkvsc_request *pend_req, *tmp;
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struct blkvsc_request *comp_req, *tmp2;
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struct vmscsi_request *vm_srb;
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int ret = 0;
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/* Flush the pending list first */
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list_for_each_entry_safe(pend_req, tmp, &blkdev->pending_list,
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pend_entry) {
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/*
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* The pend_req could be part of a partially completed
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* request. If so, complete those req first until we
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* hit the pend_req
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*/
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list_for_each_entry_safe(comp_req, tmp2,
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&pend_req->group->blkvsc_req_list,
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req_entry) {
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if (comp_req == pend_req)
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break;
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list_del(&comp_req->req_entry);
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if (comp_req->req) {
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vm_srb =
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&comp_req->request.vstor_packet.
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vm_srb;
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ret = __blk_end_request(comp_req->req,
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(!vm_srb->scsi_status ? 0 : -EIO),
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comp_req->sector_count *
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blkdev->sector_size);
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/* FIXME: shouldn't this do more than return? */
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if (ret)
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goto out;
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}
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kmem_cache_free(blkdev->request_pool, comp_req);
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}
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list_del(&pend_req->pend_entry);
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list_del(&pend_req->req_entry);
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if (comp_req->req) {
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if (!__blk_end_request(pend_req->req, -EIO,
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pend_req->sector_count *
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blkdev->sector_size)) {
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/*
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* All the sectors have been xferred ie the
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* request is done
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*/
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kmem_cache_free(blkdev->request_pool,
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pend_req->group);
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}
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}
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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);
|
|
|
|
blk_cleanup_queue(blkdev->gd->queue);
|
|
|
|
/*
|
|
* Call to the vsc driver to let it know that the device is being
|
|
* removed
|
|
*/
|
|
storvsc_dev_remove(dev);
|
|
|
|
del_gendisk(blkdev->gd);
|
|
|
|
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;
|
|
|
|
if (blkdev->users == 1) {
|
|
blkvsc_do_operation(blkdev, DO_FLUSH);
|
|
}
|
|
|
|
spin_lock_irqsave(&blkdev->lock, flags);
|
|
blkdev->users--;
|
|
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 == -1) {
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/* The one and only one */
|
|
static struct storvsc_driver blkvsc_drv = {
|
|
.base.probe = blkvsc_probe,
|
|
.base.remove = blkvsc_remove,
|
|
.base.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)
|
|
{
|
|
struct storvsc_driver *storvsc_drv = &blkvsc_drv;
|
|
struct hv_driver *drv = &blkvsc_drv.base;
|
|
int ret;
|
|
|
|
storvsc_drv->ring_buffer_size = blkvsc_ringbuffer_size;
|
|
|
|
/* Callback to client driver to complete the initialization */
|
|
blk_vsc_initialize(&storvsc_drv->base);
|
|
|
|
drv->driver.name = storvsc_drv->base.name;
|
|
|
|
/* The driver belongs to vmbus */
|
|
ret = vmbus_child_driver_register(&drv->driver);
|
|
|
|
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 */
|
|
}
|
|
|
|
static void blkvsc_drv_exit(void)
|
|
{
|
|
struct hv_driver *drv = &blkvsc_drv.base;
|
|
struct device *current_dev;
|
|
int ret;
|
|
|
|
while (1) {
|
|
current_dev = NULL;
|
|
|
|
/* Get the device */
|
|
ret = driver_for_each_device(&drv->driver, NULL,
|
|
(void *) ¤t_dev,
|
|
blkvsc_drv_exit_cb);
|
|
|
|
if (ret)
|
|
DPRINT_WARN(BLKVSC_DRV,
|
|
"driver_for_each_device returned %d", ret);
|
|
|
|
|
|
if (current_dev == NULL)
|
|
break;
|
|
|
|
/* Initiate removal from the top-down */
|
|
device_unregister(current_dev);
|
|
}
|
|
|
|
vmbus_child_driver_unregister(&drv->driver);
|
|
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* 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->events = DISK_EVENT_MEDIA_CHANGE;
|
|
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 int __init blkvsc_init(void)
|
|
{
|
|
int ret;
|
|
|
|
BUILD_BUG_ON(sizeof(sector_t) != 8);
|
|
|
|
ret = blkvsc_drv_init();
|
|
|
|
return ret;
|
|
}
|
|
|
|
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_init);
|
|
module_exit(blkvsc_exit);
|