![Stephen Hemminger](/assets/img/avatar_default.png)
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Cc: Hank Janssen <hjanssen@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
1518 lines
39 KiB
C
1518 lines
39 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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*/
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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 "osd.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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/*
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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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wait_queue_head_t wevent;
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int cond;
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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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* !!!DO NOT ADD ANYTHING BELOW HERE!!! Otherwise, memory can overlap,
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* because - The extension buffer falls right here and is pointed to by
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* request.Extension;
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* Which sounds like a horrible idea, who designed this?
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*/
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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 vm_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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int media_not_present;
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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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/* Per driver */
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struct blkvsc_driver_context {
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/* !! These must be the first 2 fields !! */
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/* FIXME this is a bug! */
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struct driver_context drv_ctx;
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struct storvsc_driver_object drv_obj;
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};
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/* Static decl */
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static int blkvsc_probe(struct device *dev);
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static int blkvsc_remove(struct device *device);
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static void blkvsc_shutdown(struct device *device);
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static int blkvsc_open(struct block_device *bdev, fmode_t mode);
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static int blkvsc_release(struct gendisk *disk, fmode_t mode);
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static int blkvsc_media_changed(struct gendisk *gd);
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static int blkvsc_revalidate_disk(struct gendisk *gd);
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static int blkvsc_getgeo(struct block_device *bd, struct hd_geometry *hg);
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static int blkvsc_ioctl(struct block_device *bd, fmode_t mode,
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unsigned cmd, unsigned long argument);
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static void blkvsc_request(struct request_queue *queue);
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static void blkvsc_request_completion(struct hv_storvsc_request *request);
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static int blkvsc_do_request(struct block_device_context *blkdev,
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struct request *req);
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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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static void blkvsc_init_rw(struct blkvsc_request *blkvsc_req);
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static void blkvsc_cmd_completion(struct hv_storvsc_request *request);
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static int blkvsc_do_inquiry(struct block_device_context *blkdev);
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static int blkvsc_do_read_capacity(struct block_device_context *blkdev);
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static int blkvsc_do_read_capacity16(struct block_device_context *blkdev);
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static int blkvsc_do_flush(struct block_device_context *blkdev);
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static int blkvsc_cancel_pending_reqs(struct block_device_context *blkdev);
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static int blkvsc_do_pending_reqs(struct block_device_context *blkdev);
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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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/* The one and only one */
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static struct blkvsc_driver_context g_blkvsc_drv;
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static const struct block_device_operations block_ops = {
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.owner = THIS_MODULE,
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.open = blkvsc_open,
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.release = blkvsc_release,
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.media_changed = blkvsc_media_changed,
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.revalidate_disk = blkvsc_revalidate_disk,
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.getgeo = blkvsc_getgeo,
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.ioctl = blkvsc_ioctl,
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};
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/*
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* blkvsc_drv_init - BlkVsc driver initialization.
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*/
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static int blkvsc_drv_init(int (*drv_init)(struct hv_driver *drv))
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{
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struct storvsc_driver_object *storvsc_drv_obj = &g_blkvsc_drv.drv_obj;
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struct driver_context *drv_ctx = &g_blkvsc_drv.drv_ctx;
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int ret;
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DPRINT_ENTER(BLKVSC_DRV);
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vmbus_get_interface(&storvsc_drv_obj->Base.VmbusChannelInterface);
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storvsc_drv_obj->RingBufferSize = blkvsc_ringbuffer_size;
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/* Callback to client driver to complete the initialization */
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drv_init(&storvsc_drv_obj->Base);
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drv_ctx->driver.name = storvsc_drv_obj->Base.name;
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memcpy(&drv_ctx->class_id, &storvsc_drv_obj->Base.deviceType,
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sizeof(struct hv_guid));
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drv_ctx->probe = blkvsc_probe;
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drv_ctx->remove = blkvsc_remove;
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drv_ctx->shutdown = blkvsc_shutdown;
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/* The driver belongs to vmbus */
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ret = vmbus_child_driver_register(drv_ctx);
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DPRINT_EXIT(BLKVSC_DRV);
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return ret;
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}
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static int blkvsc_drv_exit_cb(struct device *dev, void *data)
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{
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struct device **curr = (struct device **)data;
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*curr = dev;
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return 1; /* stop iterating */
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}
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static void blkvsc_drv_exit(void)
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{
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struct storvsc_driver_object *storvsc_drv_obj = &g_blkvsc_drv.drv_obj;
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struct driver_context *drv_ctx = &g_blkvsc_drv.drv_ctx;
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struct device *current_dev;
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int ret;
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DPRINT_ENTER(BLKVSC_DRV);
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while (1) {
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current_dev = NULL;
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/* Get the device */
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ret = driver_for_each_device(&drv_ctx->driver, NULL,
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(void *) ¤t_dev,
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blkvsc_drv_exit_cb);
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if (ret)
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DPRINT_WARN(BLKVSC_DRV,
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"driver_for_each_device returned %d", ret);
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if (current_dev == NULL)
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break;
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/* Initiate removal from the top-down */
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device_unregister(current_dev);
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}
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if (storvsc_drv_obj->Base.OnCleanup)
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storvsc_drv_obj->Base.OnCleanup(&storvsc_drv_obj->Base);
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vmbus_child_driver_unregister(drv_ctx);
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DPRINT_EXIT(BLKVSC_DRV);
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return;
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}
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/*
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* blkvsc_probe - Add a new device for this driver
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*/
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static int blkvsc_probe(struct device *device)
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{
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struct driver_context *driver_ctx =
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driver_to_driver_context(device->driver);
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struct blkvsc_driver_context *blkvsc_drv_ctx =
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(struct blkvsc_driver_context *)driver_ctx;
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struct storvsc_driver_object *storvsc_drv_obj =
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&blkvsc_drv_ctx->drv_obj;
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struct vm_device *device_ctx = device_to_vm_device(device);
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struct hv_device *device_obj = &device_ctx->device_obj;
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struct block_device_context *blkdev = NULL;
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struct storvsc_device_info device_info;
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int major = 0;
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int devnum = 0;
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int ret = 0;
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static int ide0_registered;
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static int ide1_registered;
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DPRINT_ENTER(BLKVSC_DRV);
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DPRINT_DBG(BLKVSC_DRV, "blkvsc_probe - enter");
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if (!storvsc_drv_obj->Base.OnDeviceAdd) {
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DPRINT_ERR(BLKVSC_DRV, "OnDeviceAdd() not set");
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ret = -1;
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goto Cleanup;
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}
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blkdev = kzalloc(sizeof(struct block_device_context), GFP_KERNEL);
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if (!blkdev) {
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ret = -ENOMEM;
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goto Cleanup;
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}
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INIT_LIST_HEAD(&blkdev->pending_list);
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/* Initialize what we can here */
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spin_lock_init(&blkdev->lock);
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/* ASSERT(sizeof(struct blkvsc_request_group) <= */
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/* sizeof(struct blkvsc_request)); */
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blkdev->request_pool = kmem_cache_create(dev_name(&device_ctx->device),
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sizeof(struct blkvsc_request) +
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storvsc_drv_obj->RequestExtSize, 0,
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SLAB_HWCACHE_ALIGN, NULL);
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if (!blkdev->request_pool) {
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ret = -ENOMEM;
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goto Cleanup;
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}
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/* Call to the vsc driver to add the device */
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ret = storvsc_drv_obj->Base.OnDeviceAdd(device_obj, &device_info);
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if (ret != 0) {
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DPRINT_ERR(BLKVSC_DRV, "unable to add blkvsc device");
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goto Cleanup;
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}
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blkdev->device_ctx = device_ctx;
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/* this identified the device 0 or 1 */
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blkdev->target = device_info.TargetId;
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/* this identified the ide ctrl 0 or 1 */
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blkdev->path = device_info.PathId;
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dev_set_drvdata(device, blkdev);
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/* Calculate the major and device num */
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if (blkdev->path == 0) {
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major = IDE0_MAJOR;
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devnum = blkdev->path + blkdev->target; /* 0 or 1 */
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if (!ide0_registered) {
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ret = register_blkdev(major, "ide");
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if (ret != 0) {
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DPRINT_ERR(BLKVSC_DRV,
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"register_blkdev() failed! ret %d",
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ret);
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goto Remove;
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}
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ide0_registered = 1;
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}
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} else if (blkdev->path == 1) {
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major = IDE1_MAJOR;
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devnum = blkdev->path + blkdev->target + 1; /* 2 or 3 */
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if (!ide1_registered) {
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ret = register_blkdev(major, "ide");
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if (ret != 0) {
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DPRINT_ERR(BLKVSC_DRV,
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"register_blkdev() failed! ret %d",
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ret);
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goto Remove;
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}
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ide1_registered = 1;
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}
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} else {
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DPRINT_ERR(BLKVSC_DRV, "invalid pathid");
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ret = -1;
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goto Cleanup;
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}
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DPRINT_INFO(BLKVSC_DRV, "blkvsc registered for major %d!!", major);
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blkdev->gd = alloc_disk(BLKVSC_MINORS);
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if (!blkdev->gd) {
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DPRINT_ERR(BLKVSC_DRV, "register_blkdev() failed! ret %d", ret);
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ret = -1;
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goto Cleanup;
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}
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blkdev->gd->queue = blk_init_queue(blkvsc_request, &blkdev->lock);
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blk_queue_max_segment_size(blkdev->gd->queue, PAGE_SIZE);
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blk_queue_max_segments(blkdev->gd->queue, MAX_MULTIPAGE_BUFFER_COUNT);
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blk_queue_segment_boundary(blkdev->gd->queue, PAGE_SIZE-1);
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blk_queue_bounce_limit(blkdev->gd->queue, BLK_BOUNCE_ANY);
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blk_queue_dma_alignment(blkdev->gd->queue, 511);
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blkdev->gd->major = major;
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if (devnum == 1 || devnum == 3)
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blkdev->gd->first_minor = BLKVSC_MINORS;
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else
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blkdev->gd->first_minor = 0;
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blkdev->gd->fops = &block_ops;
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blkdev->gd->private_data = blkdev;
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sprintf(blkdev->gd->disk_name, "hd%c", 'a' + devnum);
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blkvsc_do_inquiry(blkdev);
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if (blkdev->device_type == DVD_TYPE) {
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set_disk_ro(blkdev->gd, 1);
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blkdev->gd->flags |= GENHD_FL_REMOVABLE;
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blkvsc_do_read_capacity(blkdev);
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} else {
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blkvsc_do_read_capacity16(blkdev);
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}
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set_capacity(blkdev->gd, blkdev->capacity * (blkdev->sector_size/512));
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blk_queue_logical_block_size(blkdev->gd->queue, blkdev->sector_size);
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/* go! */
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add_disk(blkdev->gd);
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DPRINT_INFO(BLKVSC_DRV, "%s added!! capacity %lu sector_size %d",
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blkdev->gd->disk_name, (unsigned long)blkdev->capacity,
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blkdev->sector_size);
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return ret;
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Remove:
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storvsc_drv_obj->Base.OnDeviceRemove(device_obj);
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Cleanup:
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if (blkdev) {
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if (blkdev->request_pool) {
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kmem_cache_destroy(blkdev->request_pool);
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blkdev->request_pool = NULL;
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}
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kfree(blkdev);
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blkdev = NULL;
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}
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DPRINT_EXIT(BLKVSC_DRV);
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return ret;
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}
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static void blkvsc_shutdown(struct device *device)
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{
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struct block_device_context *blkdev = dev_get_drvdata(device);
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unsigned long flags;
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if (!blkdev)
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return;
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DPRINT_DBG(BLKVSC_DRV, "blkvsc_shutdown - users %d disk %s\n",
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blkdev->users, blkdev->gd->disk_name);
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spin_lock_irqsave(&blkdev->lock, flags);
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blkdev->shutting_down = 1;
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blk_stop_queue(blkdev->gd->queue);
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spin_unlock_irqrestore(&blkdev->lock, flags);
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while (blkdev->num_outstanding_reqs) {
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DPRINT_INFO(STORVSC, "waiting for %d requests to complete...",
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blkdev->num_outstanding_reqs);
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udelay(100);
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}
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blkvsc_do_flush(blkdev);
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spin_lock_irqsave(&blkdev->lock, flags);
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blkvsc_cancel_pending_reqs(blkdev);
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spin_unlock_irqrestore(&blkdev->lock, flags);
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}
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static int blkvsc_do_flush(struct block_device_context *blkdev)
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{
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struct blkvsc_request *blkvsc_req;
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DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_flush()\n");
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if (blkdev->device_type != HARDDISK_TYPE)
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return 0;
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|
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blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL);
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if (!blkvsc_req)
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return -ENOMEM;
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|
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memset(blkvsc_req, 0, sizeof(struct blkvsc_request));
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init_waitqueue_head(&blkvsc_req->wevent);
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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.DataBuffer.PfnArray[0] = 0;
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blkvsc_req->request.DataBuffer.Offset = 0;
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blkvsc_req->request.DataBuffer.Length = 0;
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|
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blkvsc_req->cmnd[0] = SYNCHRONIZE_CACHE;
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blkvsc_req->cmd_len = 10;
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|
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/*
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* Set this here since the completion routine may be invoked and
|
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* completed before we return
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*/
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blkvsc_req->cond = 0;
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blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion);
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|
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wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond);
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|
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kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
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|
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return 0;
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}
|
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|
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/* 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 vm_device *device_ctx = device_to_vm_device(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 vm_device *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);
|
|
|
|
/* FIXME: shouldn't this do more than return? */
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
out:
|
|
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;
|
|
}
|
|
|
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static int __init blkvsc_init(void)
|
|
{
|
|
int ret;
|
|
|
|
BUILD_BUG_ON(sizeof(sector_t) != 8);
|
|
|
|
DPRINT_ENTER(BLKVSC_DRV);
|
|
|
|
DPRINT_INFO(BLKVSC_DRV, "Blkvsc initializing....");
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|
|
|
ret = blkvsc_drv_init(BlkVscInitialize);
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|
|
|
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_VERSION(HV_DRV_VERSION);
|
|
MODULE_DESCRIPTION("Microsoft Hyper-V virtual block driver");
|
|
module_init(blkvsc_init);
|
|
module_exit(blkvsc_exit);
|