diff options
Diffstat (limited to 'drivers/staging/hv/blkvsc_drv.c')
| -rw-r--r-- | drivers/staging/hv/blkvsc_drv.c | 1511 |
1 files changed, 1511 insertions, 0 deletions
diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c new file mode 100644 index 000000000000..99c49261a8b4 --- /dev/null +++ b/drivers/staging/hv/blkvsc_drv.c @@ -0,0 +1,1511 @@ +/* + * Copyright (c) 2009, Microsoft Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 59 Temple + * Place - Suite 330, Boston, MA 02111-1307 USA. + * + * Authors: + * Hank Janssen <hjanssen@microsoft.com> + */ +#include <linux/init.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/blkdev.h> +#include <linux/major.h> +#include <linux/delay.h> +#include <linux/hdreg.h> +#include <scsi/scsi.h> +#include <scsi/scsi_cmnd.h> +#include <scsi/scsi_eh.h> +#include <scsi/scsi_dbg.h> +#include "osd.h" +#include "logging.h" +#include "vmbus.h" +#include "StorVscApi.h" + + +#define BLKVSC_MINORS 64 + +enum blkvsc_device_type { + UNKNOWN_DEV_TYPE, + HARDDISK_TYPE, + DVD_TYPE, +}; + +/* + * This request ties the struct request and struct + * blkvsc_request/hv_storvsc_request together A struct request may be + * represented by 1 or more struct blkvsc_request + */ +struct blkvsc_request_group { + int outstanding; + int status; + struct list_head blkvsc_req_list; /* list of blkvsc_requests */ +}; + +struct blkvsc_request { + /* blkvsc_request_group.blkvsc_req_list */ + struct list_head req_entry; + + /* block_device_context.pending_list */ + struct list_head pend_entry; + + /* This may be null if we generate a request internally */ + struct request *req; + + struct block_device_context *dev; + + /* The group this request is part of. Maybe null */ + struct blkvsc_request_group *group; + + 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]; + + struct hv_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; + * Which sounds like a horrible idea, who designed this? + */ +}; + +/* Per device structure */ +struct block_device_context { + /* point back to our device context */ + struct device_context *device_ctx; + struct kmem_cache *request_pool; + spinlock_t lock; + struct gendisk *gd; + enum blkvsc_device_type device_type; + struct list_head pending_list; + + unsigned char device_id[64]; + unsigned int device_id_len; + int num_outstanding_reqs; + int shutting_down; + 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 !! */ + /* FIXME this is a bug! */ + struct driver_context drv_ctx; + struct 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 block_device *bdev, fmode_t mode); +static int blkvsc_release(struct gendisk *disk, fmode_t mode); +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 block_device *bd, fmode_t mode, + unsigned cmd, unsigned long argument); +static void blkvsc_request(struct request_queue *queue); +static void blkvsc_request_completion(struct hv_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)(struct hv_storvsc_request *)); +static void blkvsc_init_rw(struct blkvsc_request *blkvsc_req); +static void blkvsc_cmd_completion(struct hv_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, +}; + +/** + * blkvsc_drv_init - BlkVsc driver initialization. + */ +static int blkvsc_drv_init(int (*drv_init)(struct hv_driver *drv)) +{ + struct storvsc_driver_object *storvsc_drv_obj = &g_blkvsc_drv.drv_obj; + struct driver_context *drv_ctx = &g_blkvsc_drv.drv_ctx; + int ret; + + 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 */ + 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(struct hv_guid)); + + drv_ctx->probe = blkvsc_probe; + drv_ctx->remove = blkvsc_remove; + drv_ctx->shutdown = blkvsc_shutdown; + + /* The driver belongs to vmbus */ + ret = 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 */ +} + +static void blkvsc_drv_exit(void) +{ + struct 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; + int ret; + + DPRINT_ENTER(BLKVSC_DRV); + + while (1) { + current_dev = NULL; + + /* Get the device */ + ret = driver_for_each_device(&drv_ctx->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); + } + + 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; +} + +/** + * blkvsc_probe - Add a new device for this driver + */ +static int blkvsc_probe(struct device *device) +{ + struct driver_context *driver_ctx = + driver_to_driver_context(device->driver); + struct blkvsc_driver_context *blkvsc_drv_ctx = + (struct blkvsc_driver_context *)driver_ctx; + struct storvsc_driver_object *storvsc_drv_obj = + &blkvsc_drv_ctx->drv_obj; + struct device_context *device_ctx = device_to_device_context(device); + struct hv_device *device_obj = &device_ctx->device_obj; + + struct block_device_context *blkdev = NULL; + struct storvsc_device_info device_info; + int major = 0; + int devnum = 0; + int ret = 0; + static int ide0_registered; + static int ide1_registered; + + 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)); + + blkdev->request_pool = kmem_cache_create(dev_name(&device_ctx->device), + sizeof(struct blkvsc_request) + + storvsc_drv_obj->RequestExtSize, 0, + SLAB_HWCACHE_ALIGN, NULL); + 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; + /* this identified the device 0 or 1 */ + blkdev->target = device_info.TargetId; + /* this identified the ide ctrl 0 or 1 */ + blkdev->path = device_info.PathId; + + dev_set_drvdata(device, 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_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_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 = dev_get_drvdata(device); + 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; + + 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; + 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); + + /* print_hex_dump_bytes("", DUMP_PREFIX_NONE, 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); + /* printk_hex_dump_bytes("", DUMP_PREFIX_NONE, 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; + 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; + 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]); + +#if 0 + 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]; +#endif + + kunmap(page_buf); + + __free_page(page_buf); + + kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); + + return 0; +} + +/** + * blkvsc_remove() - Callback when our device is removed + */ +static int blkvsc_remove(struct device *device) +{ + struct driver_context *driver_ctx = + driver_to_driver_context(device->driver); + struct blkvsc_driver_context *blkvsc_drv_ctx = + (struct blkvsc_driver_context *)driver_ctx; + struct storvsc_driver_object *storvsc_drv_obj = + &blkvsc_drv_ctx->drv_obj; + struct device_context *device_ctx = device_to_device_context(device); + struct hv_device *device_obj = &device_ctx->device_obj; + struct block_device_context *blkdev = dev_get_drvdata(device); + unsigned long flags; + int ret; + + 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)(struct hv_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; + struct storvsc_driver_object *storvsc_drv_obj = + &blkvsc_drv_ctx->drv_obj; + struct hv_storvsc_request *storvsc_req; + int ret; + + DPRINT_DBG(BLKVSC_DRV, "blkvsc_submit_request() - " + "req %p type %s start_sector %lu count %ld offset %d " + "len %d\n", blkvsc_req, + (blkvsc_req->write) ? "WRITE" : "READ", + (unsigned long) blkvsc_req->sector_start, + blkvsc_req->sector_count, + blkvsc_req->request.DataBuffer.Offset, + blkvsc_req->request.DataBuffer.Length); +#if 0 + 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]); + } +#endif + + 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 %lu \n", blkdev, req, + (unsigned long)blk_rq_pos(req)); + + /* Create a group to tie req to list of blkvsc_reqs */ + 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 = 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) { + DPRINT_DBG(BLKVSC_DRV, "bio_for_each_segment() " + "- req %p bio %p bvec %p seg_idx %d " + "databuf_idx %d\n", req, bio, bvec, + seg_idx, databuf_idx); + + /* Get a new storvsc request */ + /* 1st-time */ + if ((!blkvsc_req) || + (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_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 %lu" + " sect_count %ld (%lu %ld)\n", blkvsc_req, + (unsigned long)blkvsc_req->sector_start, + blkvsc_req->sector_count, + (unsigned long)start_sector, + (unsigned long)num_sectors); + + list_add_tail(&blkvsc_req->pend_entry, + &blkdev->pending_list); + } 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 %lu sect_count %ld (%lu %ld) " + "ret %d\n", blkvsc_req, + (unsigned long)blkvsc_req->sector_start, + blkvsc_req->sector_count, + (unsigned long)start_sector, + num_sectors, ret); + } + } + + return pending; +} + +static void blkvsc_cmd_completion(struct hv_storvsc_request *request) +{ + struct blkvsc_request *blkvsc_req = + (struct blkvsc_request *)request->Context; + struct block_device_context *blkdev = + (struct block_device_context *)blkvsc_req->dev; + struct scsi_sense_hdr sense_hdr; + + 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(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; + + ASSERT(blkvsc_req->group); + + DPRINT_DBG(BLKVSC_DRV, "blkdev %p blkvsc_req %p group %p type %s " + "sect_start %lu sect_count %ld len %d group outstd %d " + "total outstd %d\n", + blkdev, blkvsc_req, blkvsc_req->group, + (blkvsc_req->write) ? "WRITE" : "READ", + (unsigned long)blkvsc_req->sector_start, + blkvsc_req->sector_count, + blkvsc_req->request.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 %lu sect_count %ld \n", + comp_req, + (unsigned long)comp_req->sector_start, + comp_req->sector_count); + + list_del(&comp_req->req_entry); + + 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); + } + + 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 %lu sect_count %ld \n", + comp_req, + (unsigned long) comp_req->sector_start, + comp_req->sector_count); + + if (comp_req == pend_req) + break; + + list_del(&comp_req->req_entry); + + if (comp_req->req) { + ret = __blk_end_request(comp_req->req, + (!comp_req->request.Status ? 0 : -EIO), + comp_req->sector_count * + blkdev->sector_size); + 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) { + 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); + } + } + + 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 = blk_peek_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) { + __blk_end_request_cur(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; + } + + blk_start_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 block_device *bdev, fmode_t mode) +{ + struct block_device_context *blkdev = bdev->bd_disk->private_data; + + DPRINT_DBG(BLKVSC_DRV, "- users %d disk %s\n", blkdev->users, + blkdev->gd->disk_name); + + spin_lock(&blkdev->lock); + + if (!blkdev->users && blkdev->device_type == DVD_TYPE) { + spin_unlock(&blkdev->lock); + check_disk_change(bdev); + spin_lock(&blkdev->lock); + } + + blkdev->users++; + + spin_unlock(&blkdev->lock); + return 0; +} + +static int blkvsc_release(struct gendisk *disk, fmode_t mode) +{ + struct block_device_context *blkdev = disk->private_data; + + DPRINT_DBG(BLKVSC_DRV, "- users %d disk %s\n", blkdev->users, + blkdev->gd->disk_name); + + 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_logical_block_size(gd->queue, blkdev->sector_size); + } + return 0; +} + +static int blkvsc_getgeo(struct block_device *bd, struct hd_geometry *hg) +{ + sector_t total_sectors = get_capacity(bd->bd_disk); + sector_t cylinder_times_heads = 0; + sector_t temp = 0; + + int sectors_per_track = 0; + int heads = 0; + int cylinders = 0; + int rem = 0; + + if (total_sectors > (65535 * 16 * 255)) + total_sectors = (65535 * 16 * 255); + + if (total_sectors >= (65535 * 16 * 63)) { + sectors_per_track = 255; + heads = 16; + + cylinder_times_heads = total_sectors; + /* sector_div stores the quotient in cylinder_times_heads */ + rem = sector_div(cylinder_times_heads, sectors_per_track); + } else { + sectors_per_track = 17; + + cylinder_times_heads = total_sectors; + /* sector_div stores the quotient in cylinder_times_heads */ + rem = sector_div(cylinder_times_heads, sectors_per_track); + + temp = cylinder_times_heads + 1023; + /* sector_div stores the quotient in temp */ + rem = sector_div(temp, 1024); + + heads = temp; + + if (heads < 4) + heads = 4; + + + if (cylinder_times_heads >= (heads * 1024) || (heads > 16)) { + sectors_per_track = 31; + heads = 16; + + cylinder_times_heads = total_sectors; + /* + * sector_div stores the quotient in + * cylinder_times_heads + */ + rem = sector_div(cylinder_times_heads, + sectors_per_track); + } + + if (cylinder_times_heads >= (heads * 1024)) { + sectors_per_track = 63; + heads = 16; + + cylinder_times_heads = total_sectors; + /* + * sector_div stores the quotient in + * cylinder_times_heads + */ + rem = sector_div(cylinder_times_heads, + sectors_per_track); + } + } + + temp = cylinder_times_heads; + /* sector_div stores the quotient in temp */ + rem = sector_div(temp, heads); + cylinders = temp; + + hg->heads = heads; + hg->sectors = sectors_per_track; + hg->cylinders = cylinders; + + DPRINT_INFO(BLKVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads, + sectors_per_track); + + return 0; +} + +static int blkvsc_ioctl(struct block_device *bd, fmode_t mode, + unsigned cmd, unsigned long argument) +{ +/* struct block_device_context *blkdev = bd->bd_disk->private_data; */ + int ret; + + switch (cmd) { + /* + * TODO: I think there is certain format for HDIO_GET_IDENTITY rather + * than just a GUID. Commented it out for now. + */ +#if 0 + case HDIO_GET_IDENTITY: + DPRINT_INFO(BLKVSC_DRV, "HDIO_GET_IDENTITY\n"); + if (copy_to_user((void __user *)arg, blkdev->device_id, + blkdev->device_id_len)) + ret = -EFAULT; + break; +#endif + default: + ret = -EINVAL; + break; + } + + return ret; +} + +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_LICENSE("GPL"); +module_param(blkvsc_ringbuffer_size, int, S_IRUGO); +module_init(blkvsc_init); +module_exit(blkvsc_exit); |