2 * Copyright (c) 2009, Microsoft Corporation.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
15 * Place - Suite 330, Boston, MA 02111-1307 USA.
18 * Haiyang Zhang <haiyangz@microsoft.com>
19 * Hank Janssen <hjanssen@microsoft.com>
21 #include <linux/init.h>
22 #include <linux/module.h>
23 #include <linux/device.h>
24 #include <linux/blkdev.h>
25 #include <linux/major.h>
26 #include <linux/delay.h>
27 #include <linux/hdreg.h>
28 #include <linux/slab.h>
29 #include <scsi/scsi.h>
30 #include <scsi/scsi_cmnd.h>
31 #include <scsi/scsi_eh.h>
32 #include <scsi/scsi_dbg.h>
35 #include "version_info.h"
37 #include "storvsc_api.h"
40 #define BLKVSC_MINORS 64
42 enum blkvsc_device_type
{
49 * This request ties the struct request and struct
50 * blkvsc_request/hv_storvsc_request together A struct request may be
51 * represented by 1 or more struct blkvsc_request
53 struct blkvsc_request_group
{
56 struct list_head blkvsc_req_list
; /* list of blkvsc_requests */
59 struct blkvsc_request
{
60 /* blkvsc_request_group.blkvsc_req_list */
61 struct list_head req_entry
;
63 /* block_device_context.pending_list */
64 struct list_head pend_entry
;
66 /* This may be null if we generate a request internally */
69 struct block_device_context
*dev
;
71 /* The group this request is part of. Maybe null */
72 struct blkvsc_request_group
*group
;
74 wait_queue_head_t wevent
;
78 sector_t sector_start
;
79 unsigned long sector_count
;
81 unsigned char sense_buffer
[SCSI_SENSE_BUFFERSIZE
];
82 unsigned char cmd_len
;
83 unsigned char cmnd
[MAX_COMMAND_SIZE
];
85 struct hv_storvsc_request request
;
87 * !!!DO NOT ADD ANYTHING BELOW HERE!!! Otherwise, memory can overlap,
88 * because - The extension buffer falls right here and is pointed to by
90 * Which sounds like a horrible idea, who designed this?
94 /* Per device structure */
95 struct block_device_context
{
96 /* point back to our device context */
97 struct vm_device
*device_ctx
;
98 struct kmem_cache
*request_pool
;
101 enum blkvsc_device_type device_type
;
102 struct list_head pending_list
;
104 unsigned char device_id
[64];
105 unsigned int device_id_len
;
106 int num_outstanding_reqs
;
108 int media_not_present
;
109 unsigned int sector_size
;
113 unsigned char target
;
118 struct blkvsc_driver_context
{
119 /* !! These must be the first 2 fields !! */
120 /* FIXME this is a bug! */
121 struct driver_context drv_ctx
;
122 struct storvsc_driver_object drv_obj
;
126 static int blkvsc_probe(struct device
*dev
);
127 static int blkvsc_remove(struct device
*device
);
128 static void blkvsc_shutdown(struct device
*device
);
130 static int blkvsc_open(struct block_device
*bdev
, fmode_t mode
);
131 static int blkvsc_release(struct gendisk
*disk
, fmode_t mode
);
132 static int blkvsc_media_changed(struct gendisk
*gd
);
133 static int blkvsc_revalidate_disk(struct gendisk
*gd
);
134 static int blkvsc_getgeo(struct block_device
*bd
, struct hd_geometry
*hg
);
135 static int blkvsc_ioctl(struct block_device
*bd
, fmode_t mode
,
136 unsigned cmd
, unsigned long argument
);
137 static void blkvsc_request(struct request_queue
*queue
);
138 static void blkvsc_request_completion(struct hv_storvsc_request
*request
);
139 static int blkvsc_do_request(struct block_device_context
*blkdev
,
140 struct request
*req
);
141 static int blkvsc_submit_request(struct blkvsc_request
*blkvsc_req
,
142 void (*request_completion
)(struct hv_storvsc_request
*));
143 static void blkvsc_init_rw(struct blkvsc_request
*blkvsc_req
);
144 static void blkvsc_cmd_completion(struct hv_storvsc_request
*request
);
145 static int blkvsc_do_inquiry(struct block_device_context
*blkdev
);
146 static int blkvsc_do_read_capacity(struct block_device_context
*blkdev
);
147 static int blkvsc_do_read_capacity16(struct block_device_context
*blkdev
);
148 static int blkvsc_do_flush(struct block_device_context
*blkdev
);
149 static int blkvsc_cancel_pending_reqs(struct block_device_context
*blkdev
);
150 static int blkvsc_do_pending_reqs(struct block_device_context
*blkdev
);
152 static int blkvsc_ringbuffer_size
= BLKVSC_RING_BUFFER_SIZE
;
153 module_param(blkvsc_ringbuffer_size
, int, S_IRUGO
);
154 MODULE_PARM_DESC(ring_size
, "Ring buffer size (in bytes)");
156 /* The one and only one */
157 static struct blkvsc_driver_context g_blkvsc_drv
;
159 static const struct block_device_operations block_ops
= {
160 .owner
= THIS_MODULE
,
162 .release
= blkvsc_release
,
163 .media_changed
= blkvsc_media_changed
,
164 .revalidate_disk
= blkvsc_revalidate_disk
,
165 .getgeo
= blkvsc_getgeo
,
166 .ioctl
= blkvsc_ioctl
,
170 * blkvsc_drv_init - BlkVsc driver initialization.
172 static int blkvsc_drv_init(int (*drv_init
)(struct hv_driver
*drv
))
174 struct storvsc_driver_object
*storvsc_drv_obj
= &g_blkvsc_drv
.drv_obj
;
175 struct driver_context
*drv_ctx
= &g_blkvsc_drv
.drv_ctx
;
178 DPRINT_ENTER(BLKVSC_DRV
);
180 vmbus_get_interface(&storvsc_drv_obj
->Base
.VmbusChannelInterface
);
182 storvsc_drv_obj
->RingBufferSize
= blkvsc_ringbuffer_size
;
184 /* Callback to client driver to complete the initialization */
185 drv_init(&storvsc_drv_obj
->Base
);
187 drv_ctx
->driver
.name
= storvsc_drv_obj
->Base
.name
;
188 memcpy(&drv_ctx
->class_id
, &storvsc_drv_obj
->Base
.deviceType
,
189 sizeof(struct hv_guid
));
191 drv_ctx
->probe
= blkvsc_probe
;
192 drv_ctx
->remove
= blkvsc_remove
;
193 drv_ctx
->shutdown
= blkvsc_shutdown
;
195 /* The driver belongs to vmbus */
196 ret
= vmbus_child_driver_register(drv_ctx
);
198 DPRINT_EXIT(BLKVSC_DRV
);
203 static int blkvsc_drv_exit_cb(struct device
*dev
, void *data
)
205 struct device
**curr
= (struct device
**)data
;
207 return 1; /* stop iterating */
210 static void blkvsc_drv_exit(void)
212 struct storvsc_driver_object
*storvsc_drv_obj
= &g_blkvsc_drv
.drv_obj
;
213 struct driver_context
*drv_ctx
= &g_blkvsc_drv
.drv_ctx
;
214 struct device
*current_dev
;
217 DPRINT_ENTER(BLKVSC_DRV
);
223 ret
= driver_for_each_device(&drv_ctx
->driver
, NULL
,
224 (void *) ¤t_dev
,
228 DPRINT_WARN(BLKVSC_DRV
,
229 "driver_for_each_device returned %d", ret
);
232 if (current_dev
== NULL
)
235 /* Initiate removal from the top-down */
236 device_unregister(current_dev
);
239 if (storvsc_drv_obj
->Base
.OnCleanup
)
240 storvsc_drv_obj
->Base
.OnCleanup(&storvsc_drv_obj
->Base
);
242 vmbus_child_driver_unregister(drv_ctx
);
244 DPRINT_EXIT(BLKVSC_DRV
);
250 * blkvsc_probe - Add a new device for this driver
252 static int blkvsc_probe(struct device
*device
)
254 struct driver_context
*driver_ctx
=
255 driver_to_driver_context(device
->driver
);
256 struct blkvsc_driver_context
*blkvsc_drv_ctx
=
257 (struct blkvsc_driver_context
*)driver_ctx
;
258 struct storvsc_driver_object
*storvsc_drv_obj
=
259 &blkvsc_drv_ctx
->drv_obj
;
260 struct vm_device
*device_ctx
= device_to_vm_device(device
);
261 struct hv_device
*device_obj
= &device_ctx
->device_obj
;
263 struct block_device_context
*blkdev
= NULL
;
264 struct storvsc_device_info device_info
;
268 static int ide0_registered
;
269 static int ide1_registered
;
271 DPRINT_ENTER(BLKVSC_DRV
);
273 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_probe - enter");
275 if (!storvsc_drv_obj
->Base
.OnDeviceAdd
) {
276 DPRINT_ERR(BLKVSC_DRV
, "OnDeviceAdd() not set");
281 blkdev
= kzalloc(sizeof(struct block_device_context
), GFP_KERNEL
);
287 INIT_LIST_HEAD(&blkdev
->pending_list
);
289 /* Initialize what we can here */
290 spin_lock_init(&blkdev
->lock
);
292 /* ASSERT(sizeof(struct blkvsc_request_group) <= */
293 /* sizeof(struct blkvsc_request)); */
295 blkdev
->request_pool
= kmem_cache_create(dev_name(&device_ctx
->device
),
296 sizeof(struct blkvsc_request
) +
297 storvsc_drv_obj
->RequestExtSize
, 0,
298 SLAB_HWCACHE_ALIGN
, NULL
);
299 if (!blkdev
->request_pool
) {
305 /* Call to the vsc driver to add the device */
306 ret
= storvsc_drv_obj
->Base
.OnDeviceAdd(device_obj
, &device_info
);
308 DPRINT_ERR(BLKVSC_DRV
, "unable to add blkvsc device");
312 blkdev
->device_ctx
= device_ctx
;
313 /* this identified the device 0 or 1 */
314 blkdev
->target
= device_info
.TargetId
;
315 /* this identified the ide ctrl 0 or 1 */
316 blkdev
->path
= device_info
.PathId
;
318 dev_set_drvdata(device
, blkdev
);
320 /* Calculate the major and device num */
321 if (blkdev
->path
== 0) {
323 devnum
= blkdev
->path
+ blkdev
->target
; /* 0 or 1 */
325 if (!ide0_registered
) {
326 ret
= register_blkdev(major
, "ide");
328 DPRINT_ERR(BLKVSC_DRV
,
329 "register_blkdev() failed! ret %d",
336 } else if (blkdev
->path
== 1) {
338 devnum
= blkdev
->path
+ blkdev
->target
+ 1; /* 2 or 3 */
340 if (!ide1_registered
) {
341 ret
= register_blkdev(major
, "ide");
343 DPRINT_ERR(BLKVSC_DRV
,
344 "register_blkdev() failed! ret %d",
352 DPRINT_ERR(BLKVSC_DRV
, "invalid pathid");
357 DPRINT_INFO(BLKVSC_DRV
, "blkvsc registered for major %d!!", major
);
359 blkdev
->gd
= alloc_disk(BLKVSC_MINORS
);
361 DPRINT_ERR(BLKVSC_DRV
, "register_blkdev() failed! ret %d", ret
);
366 blkdev
->gd
->queue
= blk_init_queue(blkvsc_request
, &blkdev
->lock
);
368 blk_queue_max_segment_size(blkdev
->gd
->queue
, PAGE_SIZE
);
369 blk_queue_max_segments(blkdev
->gd
->queue
, MAX_MULTIPAGE_BUFFER_COUNT
);
370 blk_queue_segment_boundary(blkdev
->gd
->queue
, PAGE_SIZE
-1);
371 blk_queue_bounce_limit(blkdev
->gd
->queue
, BLK_BOUNCE_ANY
);
372 blk_queue_dma_alignment(blkdev
->gd
->queue
, 511);
374 blkdev
->gd
->major
= major
;
375 if (devnum
== 1 || devnum
== 3)
376 blkdev
->gd
->first_minor
= BLKVSC_MINORS
;
378 blkdev
->gd
->first_minor
= 0;
379 blkdev
->gd
->fops
= &block_ops
;
380 blkdev
->gd
->private_data
= blkdev
;
381 sprintf(blkdev
->gd
->disk_name
, "hd%c", 'a' + devnum
);
383 blkvsc_do_inquiry(blkdev
);
384 if (blkdev
->device_type
== DVD_TYPE
) {
385 set_disk_ro(blkdev
->gd
, 1);
386 blkdev
->gd
->flags
|= GENHD_FL_REMOVABLE
;
387 blkvsc_do_read_capacity(blkdev
);
389 blkvsc_do_read_capacity16(blkdev
);
392 set_capacity(blkdev
->gd
, blkdev
->capacity
* (blkdev
->sector_size
/512));
393 blk_queue_logical_block_size(blkdev
->gd
->queue
, blkdev
->sector_size
);
395 add_disk(blkdev
->gd
);
397 DPRINT_INFO(BLKVSC_DRV
, "%s added!! capacity %lu sector_size %d",
398 blkdev
->gd
->disk_name
, (unsigned long)blkdev
->capacity
,
399 blkdev
->sector_size
);
404 storvsc_drv_obj
->Base
.OnDeviceRemove(device_obj
);
408 if (blkdev
->request_pool
) {
409 kmem_cache_destroy(blkdev
->request_pool
);
410 blkdev
->request_pool
= NULL
;
416 DPRINT_EXIT(BLKVSC_DRV
);
421 static void blkvsc_shutdown(struct device
*device
)
423 struct block_device_context
*blkdev
= dev_get_drvdata(device
);
429 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_shutdown - users %d disk %s\n",
430 blkdev
->users
, blkdev
->gd
->disk_name
);
432 spin_lock_irqsave(&blkdev
->lock
, flags
);
434 blkdev
->shutting_down
= 1;
436 blk_stop_queue(blkdev
->gd
->queue
);
438 spin_unlock_irqrestore(&blkdev
->lock
, flags
);
440 while (blkdev
->num_outstanding_reqs
) {
441 DPRINT_INFO(STORVSC
, "waiting for %d requests to complete...",
442 blkdev
->num_outstanding_reqs
);
446 blkvsc_do_flush(blkdev
);
448 spin_lock_irqsave(&blkdev
->lock
, flags
);
450 blkvsc_cancel_pending_reqs(blkdev
);
452 spin_unlock_irqrestore(&blkdev
->lock
, flags
);
455 static int blkvsc_do_flush(struct block_device_context
*blkdev
)
457 struct blkvsc_request
*blkvsc_req
;
459 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_do_flush()\n");
461 if (blkdev
->device_type
!= HARDDISK_TYPE
)
464 blkvsc_req
= kmem_cache_alloc(blkdev
->request_pool
, GFP_KERNEL
);
468 memset(blkvsc_req
, 0, sizeof(struct blkvsc_request
));
469 init_waitqueue_head(&blkvsc_req
->wevent
);
470 blkvsc_req
->dev
= blkdev
;
471 blkvsc_req
->req
= NULL
;
472 blkvsc_req
->write
= 0;
474 blkvsc_req
->request
.DataBuffer
.PfnArray
[0] = 0;
475 blkvsc_req
->request
.DataBuffer
.Offset
= 0;
476 blkvsc_req
->request
.DataBuffer
.Length
= 0;
478 blkvsc_req
->cmnd
[0] = SYNCHRONIZE_CACHE
;
479 blkvsc_req
->cmd_len
= 10;
482 * Set this here since the completion routine may be invoked and
483 * completed before we return
485 blkvsc_req
->cond
= 0;
486 blkvsc_submit_request(blkvsc_req
, blkvsc_cmd_completion
);
488 wait_event_interruptible(blkvsc_req
->wevent
, blkvsc_req
->cond
);
490 kmem_cache_free(blkvsc_req
->dev
->request_pool
, blkvsc_req
);
495 /* Do a scsi INQUIRY cmd here to get the device type (ie disk or dvd) */
496 static int blkvsc_do_inquiry(struct block_device_context
*blkdev
)
498 struct blkvsc_request
*blkvsc_req
;
499 struct page
*page_buf
;
501 unsigned char device_type
;
503 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_do_inquiry()\n");
505 blkvsc_req
= kmem_cache_alloc(blkdev
->request_pool
, GFP_KERNEL
);
509 memset(blkvsc_req
, 0, sizeof(struct blkvsc_request
));
510 page_buf
= alloc_page(GFP_KERNEL
);
512 kmem_cache_free(blkvsc_req
->dev
->request_pool
, blkvsc_req
);
516 init_waitqueue_head(&blkvsc_req
->wevent
);
517 blkvsc_req
->dev
= blkdev
;
518 blkvsc_req
->req
= NULL
;
519 blkvsc_req
->write
= 0;
521 blkvsc_req
->request
.DataBuffer
.PfnArray
[0] = page_to_pfn(page_buf
);
522 blkvsc_req
->request
.DataBuffer
.Offset
= 0;
523 blkvsc_req
->request
.DataBuffer
.Length
= 64;
525 blkvsc_req
->cmnd
[0] = INQUIRY
;
526 blkvsc_req
->cmnd
[1] = 0x1; /* Get product data */
527 blkvsc_req
->cmnd
[2] = 0x83; /* mode page 83 */
528 blkvsc_req
->cmnd
[4] = 64;
529 blkvsc_req
->cmd_len
= 6;
532 * Set this here since the completion routine may be invoked and
533 * completed before we return
535 blkvsc_req
->cond
= 0;
537 blkvsc_submit_request(blkvsc_req
, blkvsc_cmd_completion
);
539 DPRINT_DBG(BLKVSC_DRV
, "waiting %p to complete - cond %d\n",
540 blkvsc_req
, blkvsc_req
->cond
);
542 wait_event_interruptible(blkvsc_req
->wevent
, blkvsc_req
->cond
);
544 buf
= kmap(page_buf
);
546 /* print_hex_dump_bytes("", DUMP_PREFIX_NONE, buf, 64); */
548 device_type
= buf
[0] & 0x1F;
550 if (device_type
== 0x0) {
551 blkdev
->device_type
= HARDDISK_TYPE
;
552 } else if (device_type
== 0x5) {
553 blkdev
->device_type
= DVD_TYPE
;
555 /* TODO: this is currently unsupported device type */
556 blkdev
->device_type
= UNKNOWN_DEV_TYPE
;
559 DPRINT_DBG(BLKVSC_DRV
, "device type %d\n", device_type
);
561 blkdev
->device_id_len
= buf
[7];
562 if (blkdev
->device_id_len
> 64)
563 blkdev
->device_id_len
= 64;
565 memcpy(blkdev
->device_id
, &buf
[8], blkdev
->device_id_len
);
566 /* printk_hex_dump_bytes("", DUMP_PREFIX_NONE, blkdev->device_id,
567 * blkdev->device_id_len); */
571 __free_page(page_buf
);
573 kmem_cache_free(blkvsc_req
->dev
->request_pool
, blkvsc_req
);
578 /* Do a scsi READ_CAPACITY cmd here to get the size of the disk */
579 static int blkvsc_do_read_capacity(struct block_device_context
*blkdev
)
581 struct blkvsc_request
*blkvsc_req
;
582 struct page
*page_buf
;
584 struct scsi_sense_hdr sense_hdr
;
586 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_do_read_capacity()\n");
588 blkdev
->sector_size
= 0;
589 blkdev
->capacity
= 0;
590 blkdev
->media_not_present
= 0; /* assume a disk is present */
592 blkvsc_req
= kmem_cache_alloc(blkdev
->request_pool
, GFP_KERNEL
);
596 memset(blkvsc_req
, 0, sizeof(struct blkvsc_request
));
597 page_buf
= alloc_page(GFP_KERNEL
);
599 kmem_cache_free(blkvsc_req
->dev
->request_pool
, blkvsc_req
);
603 init_waitqueue_head(&blkvsc_req
->wevent
);
604 blkvsc_req
->dev
= blkdev
;
605 blkvsc_req
->req
= NULL
;
606 blkvsc_req
->write
= 0;
608 blkvsc_req
->request
.DataBuffer
.PfnArray
[0] = page_to_pfn(page_buf
);
609 blkvsc_req
->request
.DataBuffer
.Offset
= 0;
610 blkvsc_req
->request
.DataBuffer
.Length
= 8;
612 blkvsc_req
->cmnd
[0] = READ_CAPACITY
;
613 blkvsc_req
->cmd_len
= 16;
616 * Set this here since the completion routine may be invoked
617 * and completed before we return
619 blkvsc_req
->cond
= 0;
621 blkvsc_submit_request(blkvsc_req
, blkvsc_cmd_completion
);
623 DPRINT_DBG(BLKVSC_DRV
, "waiting %p to complete - cond %d\n",
624 blkvsc_req
, blkvsc_req
->cond
);
626 wait_event_interruptible(blkvsc_req
->wevent
, blkvsc_req
->cond
);
629 if (blkvsc_req
->request
.Status
) {
630 scsi_normalize_sense(blkvsc_req
->sense_buffer
,
631 SCSI_SENSE_BUFFERSIZE
, &sense_hdr
);
633 if (sense_hdr
.asc
== 0x3A) {
634 /* Medium not present */
635 blkdev
->media_not_present
= 1;
639 buf
= kmap(page_buf
);
642 blkdev
->capacity
= ((buf
[0] << 24) | (buf
[1] << 16) |
643 (buf
[2] << 8) | buf
[3]) + 1;
644 blkdev
->sector_size
= (buf
[4] << 24) | (buf
[5] << 16) |
645 (buf
[6] << 8) | buf
[7];
649 __free_page(page_buf
);
651 kmem_cache_free(blkvsc_req
->dev
->request_pool
, blkvsc_req
);
656 static int blkvsc_do_read_capacity16(struct block_device_context
*blkdev
)
658 struct blkvsc_request
*blkvsc_req
;
659 struct page
*page_buf
;
661 struct scsi_sense_hdr sense_hdr
;
663 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_do_read_capacity16()\n");
665 blkdev
->sector_size
= 0;
666 blkdev
->capacity
= 0;
667 blkdev
->media_not_present
= 0; /* assume a disk is present */
669 blkvsc_req
= kmem_cache_alloc(blkdev
->request_pool
, GFP_KERNEL
);
673 memset(blkvsc_req
, 0, sizeof(struct blkvsc_request
));
674 page_buf
= alloc_page(GFP_KERNEL
);
676 kmem_cache_free(blkvsc_req
->dev
->request_pool
, blkvsc_req
);
680 init_waitqueue_head(&blkvsc_req
->wevent
);
681 blkvsc_req
->dev
= blkdev
;
682 blkvsc_req
->req
= NULL
;
683 blkvsc_req
->write
= 0;
685 blkvsc_req
->request
.DataBuffer
.PfnArray
[0] = page_to_pfn(page_buf
);
686 blkvsc_req
->request
.DataBuffer
.Offset
= 0;
687 blkvsc_req
->request
.DataBuffer
.Length
= 12;
689 blkvsc_req
->cmnd
[0] = 0x9E; /* READ_CAPACITY16; */
690 blkvsc_req
->cmd_len
= 16;
693 * Set this here since the completion routine may be invoked
694 * and completed before we return
696 blkvsc_req
->cond
= 0;
698 blkvsc_submit_request(blkvsc_req
, blkvsc_cmd_completion
);
700 DPRINT_DBG(BLKVSC_DRV
, "waiting %p to complete - cond %d\n",
701 blkvsc_req
, blkvsc_req
->cond
);
703 wait_event_interruptible(blkvsc_req
->wevent
, blkvsc_req
->cond
);
706 if (blkvsc_req
->request
.Status
) {
707 scsi_normalize_sense(blkvsc_req
->sense_buffer
,
708 SCSI_SENSE_BUFFERSIZE
, &sense_hdr
);
709 if (sense_hdr
.asc
== 0x3A) {
710 /* Medium not present */
711 blkdev
->media_not_present
= 1;
715 buf
= kmap(page_buf
);
718 blkdev
->capacity
= be64_to_cpu(*(unsigned long long *) &buf
[0]) + 1;
719 blkdev
->sector_size
= be32_to_cpu(*(unsigned int *)&buf
[8]);
722 blkdev
->capacity
= ((buf
[0] << 24) | (buf
[1] << 16) |
723 (buf
[2] << 8) | buf
[3]) + 1;
724 blkdev
->sector_size
= (buf
[4] << 24) | (buf
[5] << 16) |
725 (buf
[6] << 8) | buf
[7];
730 __free_page(page_buf
);
732 kmem_cache_free(blkvsc_req
->dev
->request_pool
, blkvsc_req
);
738 * blkvsc_remove() - Callback when our device is removed
740 static int blkvsc_remove(struct device
*device
)
742 struct driver_context
*driver_ctx
=
743 driver_to_driver_context(device
->driver
);
744 struct blkvsc_driver_context
*blkvsc_drv_ctx
=
745 (struct blkvsc_driver_context
*)driver_ctx
;
746 struct storvsc_driver_object
*storvsc_drv_obj
=
747 &blkvsc_drv_ctx
->drv_obj
;
748 struct vm_device
*device_ctx
= device_to_vm_device(device
);
749 struct hv_device
*device_obj
= &device_ctx
->device_obj
;
750 struct block_device_context
*blkdev
= dev_get_drvdata(device
);
754 DPRINT_ENTER(BLKVSC_DRV
);
756 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_remove()\n");
758 if (!storvsc_drv_obj
->Base
.OnDeviceRemove
) {
759 DPRINT_EXIT(BLKVSC_DRV
);
764 * Call to the vsc driver to let it know that the device is being
767 ret
= storvsc_drv_obj
->Base
.OnDeviceRemove(device_obj
);
770 DPRINT_ERR(BLKVSC_DRV
,
771 "unable to remove blkvsc device (ret %d)", ret
);
774 /* Get to a known state */
775 spin_lock_irqsave(&blkdev
->lock
, flags
);
777 blkdev
->shutting_down
= 1;
779 blk_stop_queue(blkdev
->gd
->queue
);
781 spin_unlock_irqrestore(&blkdev
->lock
, flags
);
783 while (blkdev
->num_outstanding_reqs
) {
784 DPRINT_INFO(STORVSC
, "waiting for %d requests to complete...",
785 blkdev
->num_outstanding_reqs
);
789 blkvsc_do_flush(blkdev
);
791 spin_lock_irqsave(&blkdev
->lock
, flags
);
793 blkvsc_cancel_pending_reqs(blkdev
);
795 spin_unlock_irqrestore(&blkdev
->lock
, flags
);
797 blk_cleanup_queue(blkdev
->gd
->queue
);
799 del_gendisk(blkdev
->gd
);
801 kmem_cache_destroy(blkdev
->request_pool
);
805 DPRINT_EXIT(BLKVSC_DRV
);
810 static void blkvsc_init_rw(struct blkvsc_request
*blkvsc_req
)
812 /* ASSERT(blkvsc_req->req); */
813 /* ASSERT(blkvsc_req->sector_count <= (MAX_MULTIPAGE_BUFFER_COUNT*8)); */
815 blkvsc_req
->cmd_len
= 16;
817 if (blkvsc_req
->sector_start
> 0xffffffff) {
818 if (rq_data_dir(blkvsc_req
->req
)) {
819 blkvsc_req
->write
= 1;
820 blkvsc_req
->cmnd
[0] = WRITE_16
;
822 blkvsc_req
->write
= 0;
823 blkvsc_req
->cmnd
[0] = READ_16
;
826 blkvsc_req
->cmnd
[1] |=
827 (blkvsc_req
->req
->cmd_flags
& REQ_FUA
) ? 0x8 : 0;
829 *(unsigned long long *)&blkvsc_req
->cmnd
[2] =
830 cpu_to_be64(blkvsc_req
->sector_start
);
831 *(unsigned int *)&blkvsc_req
->cmnd
[10] =
832 cpu_to_be32(blkvsc_req
->sector_count
);
833 } else if ((blkvsc_req
->sector_count
> 0xff) ||
834 (blkvsc_req
->sector_start
> 0x1fffff)) {
835 if (rq_data_dir(blkvsc_req
->req
)) {
836 blkvsc_req
->write
= 1;
837 blkvsc_req
->cmnd
[0] = WRITE_10
;
839 blkvsc_req
->write
= 0;
840 blkvsc_req
->cmnd
[0] = READ_10
;
843 blkvsc_req
->cmnd
[1] |=
844 (blkvsc_req
->req
->cmd_flags
& REQ_FUA
) ? 0x8 : 0;
846 *(unsigned int *)&blkvsc_req
->cmnd
[2] =
847 cpu_to_be32(blkvsc_req
->sector_start
);
848 *(unsigned short *)&blkvsc_req
->cmnd
[7] =
849 cpu_to_be16(blkvsc_req
->sector_count
);
851 if (rq_data_dir(blkvsc_req
->req
)) {
852 blkvsc_req
->write
= 1;
853 blkvsc_req
->cmnd
[0] = WRITE_6
;
855 blkvsc_req
->write
= 0;
856 blkvsc_req
->cmnd
[0] = READ_6
;
859 *(unsigned int *)&blkvsc_req
->cmnd
[1] =
860 cpu_to_be32(blkvsc_req
->sector_start
) >> 8;
861 blkvsc_req
->cmnd
[1] &= 0x1f;
862 blkvsc_req
->cmnd
[4] = (unsigned char)blkvsc_req
->sector_count
;
866 static int blkvsc_submit_request(struct blkvsc_request
*blkvsc_req
,
867 void (*request_completion
)(struct hv_storvsc_request
*))
869 struct block_device_context
*blkdev
= blkvsc_req
->dev
;
870 struct vm_device
*device_ctx
= blkdev
->device_ctx
;
871 struct driver_context
*driver_ctx
=
872 driver_to_driver_context(device_ctx
->device
.driver
);
873 struct blkvsc_driver_context
*blkvsc_drv_ctx
=
874 (struct blkvsc_driver_context
*)driver_ctx
;
875 struct storvsc_driver_object
*storvsc_drv_obj
=
876 &blkvsc_drv_ctx
->drv_obj
;
877 struct hv_storvsc_request
*storvsc_req
;
880 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_submit_request() - "
881 "req %p type %s start_sector %lu count %ld offset %d "
882 "len %d\n", blkvsc_req
,
883 (blkvsc_req
->write
) ? "WRITE" : "READ",
884 (unsigned long) blkvsc_req
->sector_start
,
885 blkvsc_req
->sector_count
,
886 blkvsc_req
->request
.DataBuffer
.Offset
,
887 blkvsc_req
->request
.DataBuffer
.Length
);
889 for (i
= 0; i
< (blkvsc_req
->request
.DataBuffer
.Length
>> 12); i
++) {
890 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_submit_request() - "
891 "req %p pfn[%d] %llx\n",
893 blkvsc_req
->request
.DataBuffer
.PfnArray
[i
]);
897 storvsc_req
= &blkvsc_req
->request
;
898 storvsc_req
->Extension
= (void *)((unsigned long)blkvsc_req
+
899 sizeof(struct blkvsc_request
));
901 storvsc_req
->Type
= blkvsc_req
->write
? WRITE_TYPE
: READ_TYPE
;
903 storvsc_req
->OnIOCompletion
= request_completion
;
904 storvsc_req
->Context
= blkvsc_req
;
906 storvsc_req
->Host
= blkdev
->port
;
907 storvsc_req
->Bus
= blkdev
->path
;
908 storvsc_req
->TargetId
= blkdev
->target
;
909 storvsc_req
->LunId
= 0; /* this is not really used at all */
911 storvsc_req
->CdbLen
= blkvsc_req
->cmd_len
;
912 storvsc_req
->Cdb
= blkvsc_req
->cmnd
;
914 storvsc_req
->SenseBuffer
= blkvsc_req
->sense_buffer
;
915 storvsc_req
->SenseBufferSize
= SCSI_SENSE_BUFFERSIZE
;
917 ret
= storvsc_drv_obj
->OnIORequest(&blkdev
->device_ctx
->device_obj
,
918 &blkvsc_req
->request
);
920 blkdev
->num_outstanding_reqs
++;
926 * We break the request into 1 or more blkvsc_requests and submit
927 * them. If we cant submit them all, we put them on the
928 * pending_list. The blkvsc_request() will work on the pending_list.
930 static int blkvsc_do_request(struct block_device_context
*blkdev
,
933 struct bio
*bio
= NULL
;
934 struct bio_vec
*bvec
= NULL
;
935 struct bio_vec
*prev_bvec
= NULL
;
936 struct blkvsc_request
*blkvsc_req
= NULL
;
937 struct blkvsc_request
*tmp
;
940 sector_t start_sector
;
941 unsigned long num_sectors
= 0;
944 struct blkvsc_request_group
*group
= NULL
;
946 DPRINT_DBG(BLKVSC_DRV
, "blkdev %p req %p sect %lu\n", blkdev
, req
,
947 (unsigned long)blk_rq_pos(req
));
949 /* Create a group to tie req to list of blkvsc_reqs */
950 group
= kmem_cache_alloc(blkdev
->request_pool
, GFP_ATOMIC
);
954 INIT_LIST_HEAD(&group
->blkvsc_req_list
);
955 group
->outstanding
= group
->status
= 0;
957 start_sector
= blk_rq_pos(req
);
959 /* foreach bio in the request */
961 for (bio
= req
->bio
; bio
; bio
= bio
->bi_next
) {
963 * Map this bio into an existing or new storvsc request
965 bio_for_each_segment(bvec
, bio
, seg_idx
) {
966 DPRINT_DBG(BLKVSC_DRV
, "bio_for_each_segment() "
967 "- req %p bio %p bvec %p seg_idx %d "
968 "databuf_idx %d\n", req
, bio
, bvec
,
969 seg_idx
, databuf_idx
);
971 /* Get a new storvsc request */
974 (databuf_idx
>= MAX_MULTIPAGE_BUFFER_COUNT
)
975 /* hole at the begin of page */
976 || (bvec
->bv_offset
!= 0) ||
977 /* hold at the end of page */
979 (prev_bvec
->bv_len
!= PAGE_SIZE
))) {
980 /* submit the prev one */
982 blkvsc_req
->sector_start
= start_sector
;
983 sector_div(blkvsc_req
->sector_start
, (blkdev
->sector_size
>> 9));
985 blkvsc_req
->sector_count
= num_sectors
/ (blkdev
->sector_size
>> 9);
986 blkvsc_init_rw(blkvsc_req
);
990 * Create new blkvsc_req to represent
993 blkvsc_req
= kmem_cache_alloc(blkdev
->request_pool
, GFP_ATOMIC
);
995 /* free up everything */
996 list_for_each_entry_safe(
998 &group
->blkvsc_req_list
,
1000 list_del(&blkvsc_req
->req_entry
);
1001 kmem_cache_free(blkdev
->request_pool
, blkvsc_req
);
1004 kmem_cache_free(blkdev
->request_pool
, group
);
1008 memset(blkvsc_req
, 0,
1009 sizeof(struct blkvsc_request
));
1011 blkvsc_req
->dev
= blkdev
;
1012 blkvsc_req
->req
= req
;
1013 blkvsc_req
->request
.DataBuffer
.Offset
= bvec
->bv_offset
;
1014 blkvsc_req
->request
.DataBuffer
.Length
= 0;
1016 /* Add to the group */
1017 blkvsc_req
->group
= group
;
1018 blkvsc_req
->group
->outstanding
++;
1019 list_add_tail(&blkvsc_req
->req_entry
,
1020 &blkvsc_req
->group
->blkvsc_req_list
);
1022 start_sector
+= num_sectors
;
1027 /* Add the curr bvec/segment to the curr blkvsc_req */
1028 blkvsc_req
->request
.DataBuffer
.PfnArray
[databuf_idx
] = page_to_pfn(bvec
->bv_page
);
1029 blkvsc_req
->request
.DataBuffer
.Length
+= bvec
->bv_len
;
1034 num_sectors
+= bvec
->bv_len
>> 9;
1036 } /* bio_for_each_segment */
1038 } /* rq_for_each_bio */
1041 /* Handle the last one */
1043 DPRINT_DBG(BLKVSC_DRV
, "blkdev %p req %p group %p count %d\n",
1044 blkdev
, req
, blkvsc_req
->group
,
1045 blkvsc_req
->group
->outstanding
);
1047 blkvsc_req
->sector_start
= start_sector
;
1048 sector_div(blkvsc_req
->sector_start
,
1049 (blkdev
->sector_size
>> 9));
1051 blkvsc_req
->sector_count
= num_sectors
/
1052 (blkdev
->sector_size
>> 9);
1054 blkvsc_init_rw(blkvsc_req
);
1057 list_for_each_entry(blkvsc_req
, &group
->blkvsc_req_list
, req_entry
) {
1059 DPRINT_DBG(BLKVSC_DRV
, "adding blkvsc_req to "
1060 "pending_list - blkvsc_req %p start_sect %lu"
1061 " sect_count %ld (%lu %ld)\n", blkvsc_req
,
1062 (unsigned long)blkvsc_req
->sector_start
,
1063 blkvsc_req
->sector_count
,
1064 (unsigned long)start_sector
,
1065 (unsigned long)num_sectors
);
1067 list_add_tail(&blkvsc_req
->pend_entry
,
1068 &blkdev
->pending_list
);
1070 ret
= blkvsc_submit_request(blkvsc_req
,
1071 blkvsc_request_completion
);
1074 list_add_tail(&blkvsc_req
->pend_entry
,
1075 &blkdev
->pending_list
);
1078 DPRINT_DBG(BLKVSC_DRV
, "submitted blkvsc_req %p "
1079 "start_sect %lu sect_count %ld (%lu %ld) "
1080 "ret %d\n", blkvsc_req
,
1081 (unsigned long)blkvsc_req
->sector_start
,
1082 blkvsc_req
->sector_count
,
1083 (unsigned long)start_sector
,
1091 static void blkvsc_cmd_completion(struct hv_storvsc_request
*request
)
1093 struct blkvsc_request
*blkvsc_req
=
1094 (struct blkvsc_request
*)request
->Context
;
1095 struct block_device_context
*blkdev
=
1096 (struct block_device_context
*)blkvsc_req
->dev
;
1097 struct scsi_sense_hdr sense_hdr
;
1099 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_cmd_completion() - req %p\n",
1102 blkdev
->num_outstanding_reqs
--;
1104 if (blkvsc_req
->request
.Status
)
1105 if (scsi_normalize_sense(blkvsc_req
->sense_buffer
,
1106 SCSI_SENSE_BUFFERSIZE
, &sense_hdr
))
1107 scsi_print_sense_hdr("blkvsc", &sense_hdr
);
1109 blkvsc_req
->cond
= 1;
1110 wake_up_interruptible(&blkvsc_req
->wevent
);
1113 static void blkvsc_request_completion(struct hv_storvsc_request
*request
)
1115 struct blkvsc_request
*blkvsc_req
=
1116 (struct blkvsc_request
*)request
->Context
;
1117 struct block_device_context
*blkdev
=
1118 (struct block_device_context
*)blkvsc_req
->dev
;
1119 unsigned long flags
;
1120 struct blkvsc_request
*comp_req
, *tmp
;
1122 /* ASSERT(blkvsc_req->group); */
1124 DPRINT_DBG(BLKVSC_DRV
, "blkdev %p blkvsc_req %p group %p type %s "
1125 "sect_start %lu sect_count %ld len %d group outstd %d "
1126 "total outstd %d\n",
1127 blkdev
, blkvsc_req
, blkvsc_req
->group
,
1128 (blkvsc_req
->write
) ? "WRITE" : "READ",
1129 (unsigned long)blkvsc_req
->sector_start
,
1130 blkvsc_req
->sector_count
,
1131 blkvsc_req
->request
.DataBuffer
.Length
,
1132 blkvsc_req
->group
->outstanding
,
1133 blkdev
->num_outstanding_reqs
);
1135 spin_lock_irqsave(&blkdev
->lock
, flags
);
1137 blkdev
->num_outstanding_reqs
--;
1138 blkvsc_req
->group
->outstanding
--;
1141 * Only start processing when all the blkvsc_reqs are
1142 * completed. This guarantees no out-of-order blkvsc_req
1143 * completion when calling end_that_request_first()
1145 if (blkvsc_req
->group
->outstanding
== 0) {
1146 list_for_each_entry_safe(comp_req
, tmp
,
1147 &blkvsc_req
->group
->blkvsc_req_list
,
1149 DPRINT_DBG(BLKVSC_DRV
, "completing blkvsc_req %p "
1150 "sect_start %lu sect_count %ld\n",
1152 (unsigned long)comp_req
->sector_start
,
1153 comp_req
->sector_count
);
1155 list_del(&comp_req
->req_entry
);
1157 if (!__blk_end_request(comp_req
->req
,
1158 (!comp_req
->request
.Status
? 0 : -EIO
),
1159 comp_req
->sector_count
* blkdev
->sector_size
)) {
1161 * All the sectors have been xferred ie the
1164 DPRINT_DBG(BLKVSC_DRV
, "req %p COMPLETED\n",
1166 kmem_cache_free(blkdev
->request_pool
,
1170 kmem_cache_free(blkdev
->request_pool
, comp_req
);
1173 if (!blkdev
->shutting_down
) {
1174 blkvsc_do_pending_reqs(blkdev
);
1175 blk_start_queue(blkdev
->gd
->queue
);
1176 blkvsc_request(blkdev
->gd
->queue
);
1180 spin_unlock_irqrestore(&blkdev
->lock
, flags
);
1183 static int blkvsc_cancel_pending_reqs(struct block_device_context
*blkdev
)
1185 struct blkvsc_request
*pend_req
, *tmp
;
1186 struct blkvsc_request
*comp_req
, *tmp2
;
1190 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_cancel_pending_reqs()");
1192 /* Flush the pending list first */
1193 list_for_each_entry_safe(pend_req
, tmp
, &blkdev
->pending_list
,
1196 * The pend_req could be part of a partially completed
1197 * request. If so, complete those req first until we
1200 list_for_each_entry_safe(comp_req
, tmp2
,
1201 &pend_req
->group
->blkvsc_req_list
,
1203 DPRINT_DBG(BLKVSC_DRV
, "completing blkvsc_req %p "
1204 "sect_start %lu sect_count %ld\n",
1206 (unsigned long) comp_req
->sector_start
,
1207 comp_req
->sector_count
);
1209 if (comp_req
== pend_req
)
1212 list_del(&comp_req
->req_entry
);
1214 if (comp_req
->req
) {
1215 ret
= __blk_end_request(comp_req
->req
,
1216 (!comp_req
->request
.Status
? 0 : -EIO
),
1217 comp_req
->sector_count
*
1218 blkdev
->sector_size
);
1220 /* FIXME: shouldn't this do more than return? */
1225 kmem_cache_free(blkdev
->request_pool
, comp_req
);
1228 DPRINT_DBG(BLKVSC_DRV
, "cancelling pending request - %p\n",
1231 list_del(&pend_req
->pend_entry
);
1233 list_del(&pend_req
->req_entry
);
1235 if (comp_req
->req
) {
1236 if (!__blk_end_request(pend_req
->req
, -EIO
,
1237 pend_req
->sector_count
*
1238 blkdev
->sector_size
)) {
1240 * All the sectors have been xferred ie the
1243 DPRINT_DBG(BLKVSC_DRV
,
1244 "blkvsc_cancel_pending_reqs() - "
1245 "req %p COMPLETED\n", pend_req
->req
);
1246 kmem_cache_free(blkdev
->request_pool
,
1251 kmem_cache_free(blkdev
->request_pool
, pend_req
);
1258 static int blkvsc_do_pending_reqs(struct block_device_context
*blkdev
)
1260 struct blkvsc_request
*pend_req
, *tmp
;
1263 /* Flush the pending list first */
1264 list_for_each_entry_safe(pend_req
, tmp
, &blkdev
->pending_list
,
1266 DPRINT_DBG(BLKVSC_DRV
, "working off pending_list - %p\n",
1269 ret
= blkvsc_submit_request(pend_req
,
1270 blkvsc_request_completion
);
1274 list_del(&pend_req
->pend_entry
);
1280 static void blkvsc_request(struct request_queue
*queue
)
1282 struct block_device_context
*blkdev
= NULL
;
1283 struct request
*req
;
1286 DPRINT_DBG(BLKVSC_DRV
, "- enter\n");
1287 while ((req
= blk_peek_request(queue
)) != NULL
) {
1288 DPRINT_DBG(BLKVSC_DRV
, "- req %p\n", req
);
1290 blkdev
= req
->rq_disk
->private_data
;
1291 if (blkdev
->shutting_down
|| req
->cmd_type
!= REQ_TYPE_FS
||
1292 blkdev
->media_not_present
) {
1293 __blk_end_request_cur(req
, 0);
1297 ret
= blkvsc_do_pending_reqs(blkdev
);
1300 DPRINT_DBG(BLKVSC_DRV
,
1301 "- stop queue - pending_list not empty\n");
1302 blk_stop_queue(queue
);
1306 blk_start_request(req
);
1308 ret
= blkvsc_do_request(blkdev
, req
);
1310 DPRINT_DBG(BLKVSC_DRV
, "- stop queue - no room\n");
1311 blk_stop_queue(queue
);
1313 } else if (ret
< 0) {
1314 DPRINT_DBG(BLKVSC_DRV
, "- stop queue - no mem\n");
1315 blk_requeue_request(queue
, req
);
1316 blk_stop_queue(queue
);
1322 static int blkvsc_open(struct block_device
*bdev
, fmode_t mode
)
1324 struct block_device_context
*blkdev
= bdev
->bd_disk
->private_data
;
1326 DPRINT_DBG(BLKVSC_DRV
, "- users %d disk %s\n", blkdev
->users
,
1327 blkdev
->gd
->disk_name
);
1329 spin_lock(&blkdev
->lock
);
1331 if (!blkdev
->users
&& blkdev
->device_type
== DVD_TYPE
) {
1332 spin_unlock(&blkdev
->lock
);
1333 check_disk_change(bdev
);
1334 spin_lock(&blkdev
->lock
);
1339 spin_unlock(&blkdev
->lock
);
1343 static int blkvsc_release(struct gendisk
*disk
, fmode_t mode
)
1345 struct block_device_context
*blkdev
= disk
->private_data
;
1347 DPRINT_DBG(BLKVSC_DRV
, "- users %d disk %s\n", blkdev
->users
,
1348 blkdev
->gd
->disk_name
);
1350 spin_lock(&blkdev
->lock
);
1351 if (blkdev
->users
== 1) {
1352 spin_unlock(&blkdev
->lock
);
1353 blkvsc_do_flush(blkdev
);
1354 spin_lock(&blkdev
->lock
);
1359 spin_unlock(&blkdev
->lock
);
1363 static int blkvsc_media_changed(struct gendisk
*gd
)
1365 DPRINT_DBG(BLKVSC_DRV
, "- enter\n");
1369 static int blkvsc_revalidate_disk(struct gendisk
*gd
)
1371 struct block_device_context
*blkdev
= gd
->private_data
;
1373 DPRINT_DBG(BLKVSC_DRV
, "- enter\n");
1375 if (blkdev
->device_type
== DVD_TYPE
) {
1376 blkvsc_do_read_capacity(blkdev
);
1377 set_capacity(blkdev
->gd
, blkdev
->capacity
*
1378 (blkdev
->sector_size
/512));
1379 blk_queue_logical_block_size(gd
->queue
, blkdev
->sector_size
);
1384 static int blkvsc_getgeo(struct block_device
*bd
, struct hd_geometry
*hg
)
1386 sector_t total_sectors
= get_capacity(bd
->bd_disk
);
1387 sector_t cylinder_times_heads
= 0;
1390 int sectors_per_track
= 0;
1395 if (total_sectors
> (65535 * 16 * 255))
1396 total_sectors
= (65535 * 16 * 255);
1398 if (total_sectors
>= (65535 * 16 * 63)) {
1399 sectors_per_track
= 255;
1402 cylinder_times_heads
= total_sectors
;
1403 /* sector_div stores the quotient in cylinder_times_heads */
1404 rem
= sector_div(cylinder_times_heads
, sectors_per_track
);
1406 sectors_per_track
= 17;
1408 cylinder_times_heads
= total_sectors
;
1409 /* sector_div stores the quotient in cylinder_times_heads */
1410 rem
= sector_div(cylinder_times_heads
, sectors_per_track
);
1412 temp
= cylinder_times_heads
+ 1023;
1413 /* sector_div stores the quotient in temp */
1414 rem
= sector_div(temp
, 1024);
1422 if (cylinder_times_heads
>= (heads
* 1024) || (heads
> 16)) {
1423 sectors_per_track
= 31;
1426 cylinder_times_heads
= total_sectors
;
1428 * sector_div stores the quotient in
1429 * cylinder_times_heads
1431 rem
= sector_div(cylinder_times_heads
,
1435 if (cylinder_times_heads
>= (heads
* 1024)) {
1436 sectors_per_track
= 63;
1439 cylinder_times_heads
= total_sectors
;
1441 * sector_div stores the quotient in
1442 * cylinder_times_heads
1444 rem
= sector_div(cylinder_times_heads
,
1449 temp
= cylinder_times_heads
;
1450 /* sector_div stores the quotient in temp */
1451 rem
= sector_div(temp
, heads
);
1455 hg
->sectors
= sectors_per_track
;
1456 hg
->cylinders
= cylinders
;
1458 DPRINT_INFO(BLKVSC_DRV
, "CHS (%d, %d, %d)", cylinders
, heads
,
1464 static int blkvsc_ioctl(struct block_device
*bd
, fmode_t mode
,
1465 unsigned cmd
, unsigned long argument
)
1467 /* struct block_device_context *blkdev = bd->bd_disk->private_data; */
1472 * TODO: I think there is certain format for HDIO_GET_IDENTITY rather
1473 * than just a GUID. Commented it out for now.
1476 case HDIO_GET_IDENTITY
:
1477 DPRINT_INFO(BLKVSC_DRV
, "HDIO_GET_IDENTITY\n");
1478 if (copy_to_user((void __user
*)arg
, blkdev
->device_id
,
1479 blkdev
->device_id_len
))
1491 static int __init
blkvsc_init(void)
1495 BUILD_BUG_ON(sizeof(sector_t
) != 8);
1497 DPRINT_ENTER(BLKVSC_DRV
);
1499 DPRINT_INFO(BLKVSC_DRV
, "Blkvsc initializing....");
1501 ret
= blkvsc_drv_init(BlkVscInitialize
);
1503 DPRINT_EXIT(BLKVSC_DRV
);
1508 static void __exit
blkvsc_exit(void)
1510 DPRINT_ENTER(BLKVSC_DRV
);
1512 DPRINT_ENTER(BLKVSC_DRV
);
1515 MODULE_LICENSE("GPL");
1516 MODULE_VERSION(HV_DRV_VERSION
);
1517 MODULE_DESCRIPTION("Microsoft Hyper-V virtual block driver");
1518 module_init(blkvsc_init
);
1519 module_exit(blkvsc_exit
);