Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756876Ab1F2O05 (ORCPT ); Wed, 29 Jun 2011 10:26:57 -0400 Received: from p3plsmtps2ded01.prod.phx3.secureserver.net ([208.109.80.58]:48366 "HELO p3plsmtps2ded01-02.prod.phx3.secureserver.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1755989Ab1F2OWz (ORCPT ); Wed, 29 Jun 2011 10:22:55 -0400 From: "K. Y. Srinivasan" To: gregkh@suse.de, linux-kernel@vger.kernel.org, devel@linuxdriverproject.org, virtualization@lists.osdl.org Cc: "K. Y. Srinivasan" , Haiyang Zhang , Abhishek Kane , Hank Janssen Subject: [PATCH 31/40] Staging: hv: storvsc: Get rid of blkvsc_drv.c as this code is not used Date: Wed, 29 Jun 2011 07:39:28 -0700 Message-Id: <1309358377-8537-31-git-send-email-kys@microsoft.com> X-Mailer: git-send-email 1.7.4.1 In-Reply-To: <1309358377-8537-1-git-send-email-kys@microsoft.com> References: <1309358301-8488-1-git-send-email-kys@microsoft.com> <1309358377-8537-1-git-send-email-kys@microsoft.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 25965 Lines: 1050 Now that we are handling all block devices using the scsi stack, get rid of blkvsc_drv.c as it is not used any more. Signed-off-by: K. Y. Srinivasan Signed-off-by: Haiyang Zhang Signed-off-by: Abhishek Kane Signed-off-by: Hank Janssen --- drivers/staging/hv/blkvsc_drv.c | 1024 --------------------------------------- 1 files changed, 0 insertions(+), 1024 deletions(-) delete mode 100644 drivers/staging/hv/blkvsc_drv.c diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c deleted file mode 100644 index 9898ea3..0000000 --- a/drivers/staging/hv/blkvsc_drv.c +++ /dev/null @@ -1,1024 +0,0 @@ -/* - * Copyright (c) 2009, Microsoft Corporation. - * - * This program is free software; you can redistribute it and/or modify it - * under the terms and conditions of the GNU General Public License, - * version 2, as published by the Free Software Foundation. - * - * This program is distributed in the hope it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. - * - * You should have received a copy of the GNU General Public License along with - * this program; if not, write to the Free Software Foundation, Inc., 59 Temple - * Place - Suite 330, Boston, MA 02111-1307 USA. - * - * Authors: - * Haiyang Zhang - * Hank Janssen - * K. Y. Srinivasan - */ -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include "hyperv.h" -#include "hyperv_storage.h" - - -#define BLKVSC_MINORS 64 - -enum blkvsc_device_type { - UNKNOWN_DEV_TYPE, - HARDDISK_TYPE, - DVD_TYPE, -}; - -enum blkvsc_op_type { - DO_INQUIRY, - DO_CAPACITY, - DO_FLUSH, -}; - -/* - * This request ties the struct request and struct - * blkvsc_request/hv_storvsc_request together A struct request may be - * represented by 1 or more struct blkvsc_request - */ -struct blkvsc_request_group { - int outstanding; - int status; - struct list_head blkvsc_req_list; /* list of blkvsc_requests */ -}; - -struct blkvsc_request { - /* blkvsc_request_group.blkvsc_req_list */ - struct list_head req_entry; - - /* block_device_context.pending_list */ - struct list_head pend_entry; - - /* This may be null if we generate a request internally */ - struct request *req; - - struct block_device_context *dev; - - /* The group this request is part of. Maybe null */ - struct blkvsc_request_group *group; - - int write; - sector_t sector_start; - unsigned long sector_count; - - unsigned char sense_buffer[SCSI_SENSE_BUFFERSIZE]; - unsigned char cmd_len; - unsigned char cmnd[MAX_COMMAND_SIZE]; - - struct hv_storvsc_request request; -}; - -/* Per device structure */ -struct block_device_context { - /* point back to our device context */ - struct hv_device *device_ctx; - struct kmem_cache *request_pool; - spinlock_t lock; - struct gendisk *gd; - enum blkvsc_device_type device_type; - struct list_head pending_list; - - unsigned char device_id[64]; - unsigned int device_id_len; - int num_outstanding_reqs; - int shutting_down; - unsigned int sector_size; - sector_t capacity; - unsigned int port; - unsigned char path; - unsigned char target; - int users; -}; - -static const char *drv_name = "blkvsc"; - - -/* - * There is a circular dependency involving blkvsc_request_completion() - * and blkvsc_do_request(). - */ -static void blkvsc_request_completion(struct hv_storvsc_request *request); - -static int blkvsc_ringbuffer_size = BLKVSC_RING_BUFFER_SIZE; - -module_param(blkvsc_ringbuffer_size, int, S_IRUGO); -MODULE_PARM_DESC(ring_size, "Ring buffer size (in bytes)"); - -/* - * There is a circular dependency involving blkvsc_probe() - * and block_ops. - */ -static int blkvsc_probe(struct hv_device *dev); - -static int blkvsc_device_add(struct hv_device *device, - void *additional_info) -{ - struct storvsc_device_info *device_info; - int ret = 0; - - device_info = (struct storvsc_device_info *)additional_info; - - device_info->ring_buffer_size = blkvsc_ringbuffer_size; - - ret = storvsc_dev_add(device, additional_info); - if (ret != 0) - return ret; - - /* - * We need to use the device instance guid to set the path and target - * id. For IDE devices, the device instance id is formatted as - * * - - 8899 - 000000000000. - */ - device_info->path_id = device->dev_instance.data[3] << 24 | - device->dev_instance.data[2] << 16 | - device->dev_instance.data[1] << 8 | - device->dev_instance.data[0]; - - device_info->target_id = device->dev_instance.data[5] << 8 | - device->dev_instance.data[4]; - - return ret; -} - -static int blkvsc_submit_request(struct blkvsc_request *blkvsc_req, - void (*request_completion)(struct hv_storvsc_request *)) -{ - struct block_device_context *blkdev = blkvsc_req->dev; - struct hv_storvsc_request *storvsc_req; - struct vmscsi_request *vm_srb; - int ret; - - - storvsc_req = &blkvsc_req->request; - vm_srb = &storvsc_req->vstor_packet.vm_srb; - - vm_srb->data_in = blkvsc_req->write ? WRITE_TYPE : READ_TYPE; - - storvsc_req->on_io_completion = request_completion; - storvsc_req->context = blkvsc_req; - - vm_srb->port_number = blkdev->port; - vm_srb->path_id = blkdev->path; - vm_srb->target_id = blkdev->target; - vm_srb->lun = 0; /* this is not really used at all */ - - vm_srb->cdb_length = blkvsc_req->cmd_len; - - memcpy(vm_srb->cdb, blkvsc_req->cmnd, vm_srb->cdb_length); - - storvsc_req->sense_buffer = blkvsc_req->sense_buffer; - - ret = storvsc_do_io(blkdev->device_ctx, - &blkvsc_req->request); - if (ret == 0) - blkdev->num_outstanding_reqs++; - - return ret; -} - - -static int blkvsc_open(struct block_device *bdev, fmode_t mode) -{ - struct block_device_context *blkdev = bdev->bd_disk->private_data; - unsigned long flags; - - spin_lock_irqsave(&blkdev->lock, flags); - - blkdev->users++; - - spin_unlock_irqrestore(&blkdev->lock, flags); - - return 0; -} - - -static int blkvsc_getgeo(struct block_device *bd, struct hd_geometry *hg) -{ - sector_t nsect = get_capacity(bd->bd_disk); - sector_t cylinders = nsect; - - /* - * We are making up these values; let us keep it simple. - */ - hg->heads = 0xff; - hg->sectors = 0x3f; - sector_div(cylinders, hg->heads * hg->sectors); - hg->cylinders = cylinders; - if ((sector_t)(hg->cylinders + 1) * hg->heads * hg->sectors < nsect) - hg->cylinders = 0xffff; - return 0; - -} - - -static void blkvsc_init_rw(struct blkvsc_request *blkvsc_req) -{ - - blkvsc_req->cmd_len = 16; - - if (rq_data_dir(blkvsc_req->req)) { - blkvsc_req->write = 1; - blkvsc_req->cmnd[0] = WRITE_16; - } else { - blkvsc_req->write = 0; - blkvsc_req->cmnd[0] = READ_16; - } - - blkvsc_req->cmnd[1] |= - (blkvsc_req->req->cmd_flags & REQ_FUA) ? 0x8 : 0; - - *(unsigned long long *)&blkvsc_req->cmnd[2] = - cpu_to_be64(blkvsc_req->sector_start); - *(unsigned int *)&blkvsc_req->cmnd[10] = - cpu_to_be32(blkvsc_req->sector_count); -} - - -static int blkvsc_ioctl(struct block_device *bd, fmode_t mode, - unsigned cmd, unsigned long arg) -{ - struct block_device_context *blkdev = bd->bd_disk->private_data; - int ret = 0; - - switch (cmd) { - case HDIO_GET_IDENTITY: - if (copy_to_user((void __user *)arg, blkdev->device_id, - blkdev->device_id_len)) - ret = -EFAULT; - break; - default: - ret = -EINVAL; - break; - } - - return ret; -} - -static void blkvsc_cmd_completion(struct hv_storvsc_request *request) -{ - struct blkvsc_request *blkvsc_req = - (struct blkvsc_request *)request->context; - struct block_device_context *blkdev = - (struct block_device_context *)blkvsc_req->dev; - struct scsi_sense_hdr sense_hdr; - struct vmscsi_request *vm_srb; - unsigned long flags; - - - vm_srb = &blkvsc_req->request.vstor_packet.vm_srb; - - spin_lock_irqsave(&blkdev->lock, flags); - blkdev->num_outstanding_reqs--; - spin_unlock_irqrestore(&blkdev->lock, flags); - - if (vm_srb->scsi_status) - if (scsi_normalize_sense(blkvsc_req->sense_buffer, - SCSI_SENSE_BUFFERSIZE, &sense_hdr)) - scsi_print_sense_hdr("blkvsc", &sense_hdr); - - complete(&blkvsc_req->request.wait_event); -} - - -static int blkvsc_do_operation(struct block_device_context *blkdev, - enum blkvsc_op_type op) -{ - struct blkvsc_request *blkvsc_req; - struct page *page_buf; - unsigned char *buf; - unsigned char device_type; - struct scsi_sense_hdr sense_hdr; - struct vmscsi_request *vm_srb; - unsigned long flags; - - int ret = 0; - - blkvsc_req = kmem_cache_zalloc(blkdev->request_pool, GFP_KERNEL); - if (!blkvsc_req) - return -ENOMEM; - - page_buf = alloc_page(GFP_KERNEL); - if (!page_buf) { - kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); - return -ENOMEM; - } - - vm_srb = &blkvsc_req->request.vstor_packet.vm_srb; - init_completion(&blkvsc_req->request.wait_event); - blkvsc_req->dev = blkdev; - blkvsc_req->req = NULL; - blkvsc_req->write = 0; - - blkvsc_req->request.data_buffer.pfn_array[0] = - page_to_pfn(page_buf); - blkvsc_req->request.data_buffer.offset = 0; - - switch (op) { - case DO_INQUIRY: - blkvsc_req->cmnd[0] = INQUIRY; - blkvsc_req->cmnd[1] = 0x1; /* Get product data */ - blkvsc_req->cmnd[2] = 0x83; /* mode page 83 */ - blkvsc_req->cmnd[4] = 64; - blkvsc_req->cmd_len = 6; - blkvsc_req->request.data_buffer.len = 64; - break; - - case DO_CAPACITY: - blkdev->sector_size = 0; - blkdev->capacity = 0; - - blkvsc_req->cmnd[0] = READ_CAPACITY; - blkvsc_req->cmd_len = 16; - blkvsc_req->request.data_buffer.len = 8; - break; - - case DO_FLUSH: - blkvsc_req->cmnd[0] = SYNCHRONIZE_CACHE; - blkvsc_req->cmd_len = 10; - blkvsc_req->request.data_buffer.pfn_array[0] = 0; - blkvsc_req->request.data_buffer.len = 0; - break; - default: - ret = -EINVAL; - goto cleanup; - } - - spin_lock_irqsave(&blkdev->lock, flags); - blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion); - spin_unlock_irqrestore(&blkdev->lock, flags); - - wait_for_completion_interruptible(&blkvsc_req->request.wait_event); - - /* check error */ - if (vm_srb->scsi_status) { - scsi_normalize_sense(blkvsc_req->sense_buffer, - SCSI_SENSE_BUFFERSIZE, &sense_hdr); - - return 0; - } - - buf = kmap(page_buf); - - switch (op) { - case DO_INQUIRY: - device_type = buf[0] & 0x1F; - - if (device_type == 0x0) - blkdev->device_type = HARDDISK_TYPE; - else - blkdev->device_type = UNKNOWN_DEV_TYPE; - - blkdev->device_id_len = buf[7]; - if (blkdev->device_id_len > 64) - blkdev->device_id_len = 64; - - memcpy(blkdev->device_id, &buf[8], blkdev->device_id_len); - break; - - case DO_CAPACITY: - /* be to le */ - blkdev->capacity = - ((buf[0] << 24) | (buf[1] << 16) | - (buf[2] << 8) | buf[3]) + 1; - - blkdev->sector_size = - (buf[4] << 24) | (buf[5] << 16) | - (buf[6] << 8) | buf[7]; - break; - default: - break; - - } - -cleanup: - - kunmap(page_buf); - - __free_page(page_buf); - - kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); - - return ret; -} - - -static int blkvsc_cancel_pending_reqs(struct block_device_context *blkdev) -{ - struct blkvsc_request *pend_req, *tmp; - struct blkvsc_request *comp_req, *tmp2; - struct vmscsi_request *vm_srb; - - int ret = 0; - - - /* Flush the pending list first */ - list_for_each_entry_safe(pend_req, tmp, &blkdev->pending_list, - pend_entry) { - /* - * The pend_req could be part of a partially completed - * request. If so, complete those req first until we - * hit the pend_req - */ - list_for_each_entry_safe(comp_req, tmp2, - &pend_req->group->blkvsc_req_list, - req_entry) { - - if (comp_req == pend_req) - break; - - list_del(&comp_req->req_entry); - - if (comp_req->req) { - vm_srb = - &comp_req->request.vstor_packet. - vm_srb; - ret = __blk_end_request(comp_req->req, - (!vm_srb->scsi_status ? 0 : -EIO), - comp_req->sector_count * - blkdev->sector_size); - - /* FIXME: shouldn't this do more than return? */ - if (ret) - goto out; - } - - kmem_cache_free(blkdev->request_pool, comp_req); - } - - list_del(&pend_req->pend_entry); - - list_del(&pend_req->req_entry); - - if (comp_req->req) { - if (!__blk_end_request(pend_req->req, -EIO, - pend_req->sector_count * - blkdev->sector_size)) { - /* - * All the sectors have been xferred ie the - * request is done - */ - kmem_cache_free(blkdev->request_pool, - pend_req->group); - } - } - - kmem_cache_free(blkdev->request_pool, pend_req); - } - -out: - return ret; -} - - -/* - * blkvsc_remove() - Callback when our device is removed - */ -static int blkvsc_remove(struct hv_device *dev) -{ - struct block_device_context *blkdev = dev_get_drvdata(&dev->device); - unsigned long flags; - - - /* Get to a known state */ - spin_lock_irqsave(&blkdev->lock, flags); - - blkdev->shutting_down = 1; - - blk_stop_queue(blkdev->gd->queue); - - blkvsc_cancel_pending_reqs(blkdev); - - spin_unlock_irqrestore(&blkdev->lock, flags); - - blkvsc_do_operation(blkdev, DO_FLUSH); - - if (blkdev->users == 0) { - del_gendisk(blkdev->gd); - put_disk(blkdev->gd); - blk_cleanup_queue(blkdev->gd->queue); - - storvsc_dev_remove(blkdev->device_ctx); - - kmem_cache_destroy(blkdev->request_pool); - kfree(blkdev); - } - - return 0; -} - -static void blkvsc_shutdown(struct hv_device *dev) -{ - struct block_device_context *blkdev = dev_get_drvdata(&dev->device); - unsigned long flags; - - if (!blkdev) - return; - - spin_lock_irqsave(&blkdev->lock, flags); - - blkdev->shutting_down = 1; - - blk_stop_queue(blkdev->gd->queue); - - blkvsc_cancel_pending_reqs(blkdev); - - spin_unlock_irqrestore(&blkdev->lock, flags); - - blkvsc_do_operation(blkdev, DO_FLUSH); - - /* - * Now wait for all outgoing I/O to be drained. - */ - storvsc_wait_to_drain((struct storvsc_device *)dev->ext); - -} - -static int blkvsc_release(struct gendisk *disk, fmode_t mode) -{ - struct block_device_context *blkdev = disk->private_data; - unsigned long flags; - - spin_lock_irqsave(&blkdev->lock, flags); - - if ((--blkdev->users == 0) && (blkdev->shutting_down)) { - blk_stop_queue(blkdev->gd->queue); - spin_unlock_irqrestore(&blkdev->lock, flags); - - blkvsc_do_operation(blkdev, DO_FLUSH); - del_gendisk(blkdev->gd); - put_disk(blkdev->gd); - blk_cleanup_queue(blkdev->gd->queue); - - storvsc_dev_remove(blkdev->device_ctx); - - kmem_cache_destroy(blkdev->request_pool); - kfree(blkdev); - } else - spin_unlock_irqrestore(&blkdev->lock, flags); - - return 0; -} - - -/* - * We break the request into 1 or more blkvsc_requests and submit - * them. If we cant submit them all, we put them on the - * pending_list. The blkvsc_request() will work on the pending_list. - */ -static int blkvsc_do_request(struct block_device_context *blkdev, - struct request *req) -{ - struct bio *bio = NULL; - struct bio_vec *bvec = NULL; - struct bio_vec *prev_bvec = NULL; - struct blkvsc_request *blkvsc_req = NULL; - struct blkvsc_request *tmp; - int databuf_idx = 0; - int seg_idx = 0; - sector_t start_sector; - unsigned long num_sectors = 0; - int ret = 0; - int pending = 0; - struct blkvsc_request_group *group = NULL; - - /* Create a group to tie req to list of blkvsc_reqs */ - group = kmem_cache_zalloc(blkdev->request_pool, GFP_ATOMIC); - if (!group) - return -ENOMEM; - - INIT_LIST_HEAD(&group->blkvsc_req_list); - group->outstanding = group->status = 0; - - start_sector = blk_rq_pos(req); - - /* foreach bio in the request */ - if (req->bio) { - for (bio = req->bio; bio; bio = bio->bi_next) { - /* - * Map this bio into an existing or new storvsc request - */ - bio_for_each_segment(bvec, bio, seg_idx) { - /* Get a new storvsc request */ - /* 1st-time */ - if ((!blkvsc_req) || - (databuf_idx >= MAX_MULTIPAGE_BUFFER_COUNT) - /* hole at the begin of page */ - || (bvec->bv_offset != 0) || - /* hold at the end of page */ - (prev_bvec && - (prev_bvec->bv_len != PAGE_SIZE))) { - /* submit the prev one */ - if (blkvsc_req) { - blkvsc_req->sector_start = - start_sector; - sector_div( - blkvsc_req->sector_start, - (blkdev->sector_size >> 9)); - - blkvsc_req->sector_count = - num_sectors / - (blkdev->sector_size >> 9); - blkvsc_init_rw(blkvsc_req); - } - - /* - * Create new blkvsc_req to represent - * the current bvec - */ - blkvsc_req = - kmem_cache_zalloc( - blkdev->request_pool, GFP_ATOMIC); - if (!blkvsc_req) { - /* free up everything */ - list_for_each_entry_safe( - blkvsc_req, tmp, - &group->blkvsc_req_list, - req_entry) { - list_del( - &blkvsc_req->req_entry); - kmem_cache_free( - blkdev->request_pool, - blkvsc_req); - } - - kmem_cache_free( - blkdev->request_pool, group); - return -ENOMEM; - } - - memset(blkvsc_req, 0, - sizeof(struct blkvsc_request)); - - blkvsc_req->dev = blkdev; - blkvsc_req->req = req; - blkvsc_req->request. - data_buffer.offset - = bvec->bv_offset; - blkvsc_req->request. - data_buffer.len = 0; - - /* Add to the group */ - blkvsc_req->group = group; - blkvsc_req->group->outstanding++; - list_add_tail(&blkvsc_req->req_entry, - &blkvsc_req->group->blkvsc_req_list); - - start_sector += num_sectors; - num_sectors = 0; - databuf_idx = 0; - } - - /* - * Add the curr bvec/segment to the curr - * blkvsc_req - */ - blkvsc_req->request.data_buffer. - pfn_array[databuf_idx] - = page_to_pfn(bvec->bv_page); - blkvsc_req->request.data_buffer.len - += bvec->bv_len; - - prev_bvec = bvec; - - databuf_idx++; - num_sectors += bvec->bv_len >> 9; - - } /* bio_for_each_segment */ - - } /* rq_for_each_bio */ - } - - /* Handle the last one */ - if (blkvsc_req) { - blkvsc_req->sector_start = start_sector; - sector_div(blkvsc_req->sector_start, - (blkdev->sector_size >> 9)); - - blkvsc_req->sector_count = num_sectors / - (blkdev->sector_size >> 9); - - blkvsc_init_rw(blkvsc_req); - } - - list_for_each_entry(blkvsc_req, &group->blkvsc_req_list, req_entry) { - if (pending) { - - list_add_tail(&blkvsc_req->pend_entry, - &blkdev->pending_list); - } else { - ret = blkvsc_submit_request(blkvsc_req, - blkvsc_request_completion); - if (ret == -EAGAIN) { - pending = 1; - list_add_tail(&blkvsc_req->pend_entry, - &blkdev->pending_list); - } - - } - } - - return pending; -} - -static int blkvsc_do_pending_reqs(struct block_device_context *blkdev) -{ - struct blkvsc_request *pend_req, *tmp; - int ret = 0; - - /* Flush the pending list first */ - list_for_each_entry_safe(pend_req, tmp, &blkdev->pending_list, - pend_entry) { - - ret = blkvsc_submit_request(pend_req, - blkvsc_request_completion); - if (ret != 0) - break; - else - list_del(&pend_req->pend_entry); - } - - return ret; -} - - -static void blkvsc_request(struct request_queue *queue) -{ - struct block_device_context *blkdev = NULL; - struct request *req; - int ret = 0; - - while ((req = blk_peek_request(queue)) != NULL) { - - blkdev = req->rq_disk->private_data; - if (blkdev->shutting_down || req->cmd_type != REQ_TYPE_FS) { - __blk_end_request_cur(req, 0); - continue; - } - - ret = blkvsc_do_pending_reqs(blkdev); - - if (ret != 0) { - blk_stop_queue(queue); - break; - } - - blk_start_request(req); - - ret = blkvsc_do_request(blkdev, req); - if (ret > 0) { - blk_stop_queue(queue); - break; - } else if (ret < 0) { - blk_requeue_request(queue, req); - blk_stop_queue(queue); - break; - } - } -} - -static const struct hv_vmbus_device_id id_table[] = { - { "hv_block" }, - { "" } -}; - - -/* The one and only one */ -static struct hv_driver blkvsc_drv = { - .id_table = id_table, - .probe = blkvsc_probe, - .remove = blkvsc_remove, - .shutdown = blkvsc_shutdown, -}; - -static const struct block_device_operations block_ops = { - .owner = THIS_MODULE, - .open = blkvsc_open, - .release = blkvsc_release, - .getgeo = blkvsc_getgeo, - .ioctl = blkvsc_ioctl, -}; - -/* - * blkvsc_drv_init - BlkVsc driver initialization. - */ -static int blkvsc_drv_init(void) -{ - struct hv_driver *drv = &blkvsc_drv; - int ret; - - BUILD_BUG_ON(sizeof(sector_t) != 8); - - drv->driver.name = drv_name; - - /* The driver belongs to vmbus */ - ret = vmbus_child_driver_register(&drv->driver); - - return ret; -} - - -static void blkvsc_drv_exit(void) -{ - - vmbus_child_driver_unregister(&blkvsc_drv.driver); -} - -/* - * blkvsc_probe - Add a new device for this driver - */ -static int blkvsc_probe(struct hv_device *dev) -{ - struct block_device_context *blkdev = NULL; - struct storvsc_device_info device_info; - struct storvsc_major_info major_info; - int ret = 0; - - blkdev = kzalloc(sizeof(struct block_device_context), GFP_KERNEL); - if (!blkdev) { - ret = -ENOMEM; - goto cleanup; - } - - INIT_LIST_HEAD(&blkdev->pending_list); - - /* Initialize what we can here */ - spin_lock_init(&blkdev->lock); - - - blkdev->request_pool = kmem_cache_create(dev_name(&dev->device), - sizeof(struct blkvsc_request), 0, - SLAB_HWCACHE_ALIGN, NULL); - if (!blkdev->request_pool) { - ret = -ENOMEM; - goto cleanup; - } - - - ret = blkvsc_device_add(dev, &device_info); - if (ret != 0) - goto cleanup; - - blkdev->device_ctx = dev; - /* this identified the device 0 or 1 */ - blkdev->target = device_info.target_id; - /* this identified the ide ctrl 0 or 1 */ - blkdev->path = device_info.path_id; - - dev_set_drvdata(&dev->device, blkdev); - - ret = storvsc_get_major_info(&device_info, &major_info); - - if (ret) - goto cleanup; - - if (major_info.do_register) { - ret = register_blkdev(major_info.major, major_info.devname); - - if (ret != 0) { - DPRINT_ERR(BLKVSC_DRV, - "register_blkdev() failed! ret %d", ret); - goto remove; - } - } - - DPRINT_INFO(BLKVSC_DRV, "blkvsc registered for major %d!!", - major_info.major); - - blkdev->gd = alloc_disk(BLKVSC_MINORS); - if (!blkdev->gd) { - ret = -1; - goto cleanup; - } - - blkdev->gd->queue = blk_init_queue(blkvsc_request, &blkdev->lock); - - blk_queue_max_segment_size(blkdev->gd->queue, PAGE_SIZE); - blk_queue_max_segments(blkdev->gd->queue, MAX_MULTIPAGE_BUFFER_COUNT); - blk_queue_segment_boundary(blkdev->gd->queue, PAGE_SIZE-1); - blk_queue_bounce_limit(blkdev->gd->queue, BLK_BOUNCE_ANY); - blk_queue_dma_alignment(blkdev->gd->queue, 511); - - blkdev->gd->major = major_info.major; - if (major_info.index == 1 || major_info.index == 3) - blkdev->gd->first_minor = BLKVSC_MINORS; - else - blkdev->gd->first_minor = 0; - blkdev->gd->fops = &block_ops; - blkdev->gd->private_data = blkdev; - blkdev->gd->driverfs_dev = &(blkdev->device_ctx->device); - sprintf(blkdev->gd->disk_name, "hd%c", 'a' + major_info.index); - - blkvsc_do_operation(blkdev, DO_INQUIRY); - blkvsc_do_operation(blkdev, DO_CAPACITY); - - set_capacity(blkdev->gd, blkdev->capacity * (blkdev->sector_size/512)); - blk_queue_logical_block_size(blkdev->gd->queue, blkdev->sector_size); - /* go! */ - add_disk(blkdev->gd); - - DPRINT_INFO(BLKVSC_DRV, "%s added!! capacity %lu sector_size %d", - blkdev->gd->disk_name, (unsigned long)blkdev->capacity, - blkdev->sector_size); - - return ret; - -remove: - storvsc_dev_remove(dev); - -cleanup: - if (blkdev) { - if (blkdev->request_pool) { - kmem_cache_destroy(blkdev->request_pool); - blkdev->request_pool = NULL; - } - kfree(blkdev); - blkdev = NULL; - } - - return ret; -} - -static void blkvsc_request_completion(struct hv_storvsc_request *request) -{ - struct blkvsc_request *blkvsc_req = - (struct blkvsc_request *)request->context; - struct block_device_context *blkdev = - (struct block_device_context *)blkvsc_req->dev; - unsigned long flags; - struct blkvsc_request *comp_req, *tmp; - struct vmscsi_request *vm_srb; - - - spin_lock_irqsave(&blkdev->lock, flags); - - blkdev->num_outstanding_reqs--; - blkvsc_req->group->outstanding--; - - /* - * Only start processing when all the blkvsc_reqs are - * completed. This guarantees no out-of-order blkvsc_req - * completion when calling end_that_request_first() - */ - if (blkvsc_req->group->outstanding == 0) { - list_for_each_entry_safe(comp_req, tmp, - &blkvsc_req->group->blkvsc_req_list, - req_entry) { - - list_del(&comp_req->req_entry); - - vm_srb = - &comp_req->request.vstor_packet.vm_srb; - if (!__blk_end_request(comp_req->req, - (!vm_srb->scsi_status ? 0 : -EIO), - comp_req->sector_count * blkdev->sector_size)) { - /* - * All the sectors have been xferred ie the - * request is done - */ - kmem_cache_free(blkdev->request_pool, - comp_req->group); - } - - kmem_cache_free(blkdev->request_pool, comp_req); - } - - if (!blkdev->shutting_down) { - blkvsc_do_pending_reqs(blkdev); - blk_start_queue(blkdev->gd->queue); - blkvsc_request(blkdev->gd->queue); - } - } - - spin_unlock_irqrestore(&blkdev->lock, flags); -} - -static void __exit blkvsc_exit(void) -{ - blkvsc_drv_exit(); -} - -MODULE_LICENSE("GPL"); -MODULE_VERSION(HV_DRV_VERSION); -MODULE_DESCRIPTION("Microsoft Hyper-V virtual block driver"); -MODULE_ALIAS("vmbus:hv_block"); -module_init(blkvsc_drv_init); -module_exit(blkvsc_exit); -- 1.7.4.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/