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 vmbus_get_interface(&storvsc_drv_obj
->Base
.VmbusChannelInterface
);
180 storvsc_drv_obj
->RingBufferSize
= blkvsc_ringbuffer_size
;
182 /* Callback to client driver to complete the initialization */
183 drv_init(&storvsc_drv_obj
->Base
);
185 drv_ctx
->driver
.name
= storvsc_drv_obj
->Base
.name
;
186 memcpy(&drv_ctx
->class_id
, &storvsc_drv_obj
->Base
.deviceType
,
187 sizeof(struct hv_guid
));
189 drv_ctx
->probe
= blkvsc_probe
;
190 drv_ctx
->remove
= blkvsc_remove
;
191 drv_ctx
->shutdown
= blkvsc_shutdown
;
193 /* The driver belongs to vmbus */
194 ret
= vmbus_child_driver_register(drv_ctx
);
199 static int blkvsc_drv_exit_cb(struct device
*dev
, void *data
)
201 struct device
**curr
= (struct device
**)data
;
203 return 1; /* stop iterating */
206 static void blkvsc_drv_exit(void)
208 struct storvsc_driver_object
*storvsc_drv_obj
= &g_blkvsc_drv
.drv_obj
;
209 struct driver_context
*drv_ctx
= &g_blkvsc_drv
.drv_ctx
;
210 struct device
*current_dev
;
217 ret
= driver_for_each_device(&drv_ctx
->driver
, NULL
,
218 (void *) ¤t_dev
,
222 DPRINT_WARN(BLKVSC_DRV
,
223 "driver_for_each_device returned %d", ret
);
226 if (current_dev
== NULL
)
229 /* Initiate removal from the top-down */
230 device_unregister(current_dev
);
233 if (storvsc_drv_obj
->Base
.OnCleanup
)
234 storvsc_drv_obj
->Base
.OnCleanup(&storvsc_drv_obj
->Base
);
236 vmbus_child_driver_unregister(drv_ctx
);
242 * blkvsc_probe - Add a new device for this driver
244 static int blkvsc_probe(struct device
*device
)
246 struct driver_context
*driver_ctx
=
247 driver_to_driver_context(device
->driver
);
248 struct blkvsc_driver_context
*blkvsc_drv_ctx
=
249 (struct blkvsc_driver_context
*)driver_ctx
;
250 struct storvsc_driver_object
*storvsc_drv_obj
=
251 &blkvsc_drv_ctx
->drv_obj
;
252 struct vm_device
*device_ctx
= device_to_vm_device(device
);
253 struct hv_device
*device_obj
= &device_ctx
->device_obj
;
255 struct block_device_context
*blkdev
= NULL
;
256 struct storvsc_device_info device_info
;
260 static int ide0_registered
;
261 static int ide1_registered
;
263 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_probe - enter");
265 if (!storvsc_drv_obj
->Base
.OnDeviceAdd
) {
266 DPRINT_ERR(BLKVSC_DRV
, "OnDeviceAdd() not set");
271 blkdev
= kzalloc(sizeof(struct block_device_context
), GFP_KERNEL
);
277 INIT_LIST_HEAD(&blkdev
->pending_list
);
279 /* Initialize what we can here */
280 spin_lock_init(&blkdev
->lock
);
282 /* ASSERT(sizeof(struct blkvsc_request_group) <= */
283 /* sizeof(struct blkvsc_request)); */
285 blkdev
->request_pool
= kmem_cache_create(dev_name(&device_ctx
->device
),
286 sizeof(struct blkvsc_request
) +
287 storvsc_drv_obj
->RequestExtSize
, 0,
288 SLAB_HWCACHE_ALIGN
, NULL
);
289 if (!blkdev
->request_pool
) {
295 /* Call to the vsc driver to add the device */
296 ret
= storvsc_drv_obj
->Base
.OnDeviceAdd(device_obj
, &device_info
);
298 DPRINT_ERR(BLKVSC_DRV
, "unable to add blkvsc device");
302 blkdev
->device_ctx
= device_ctx
;
303 /* this identified the device 0 or 1 */
304 blkdev
->target
= device_info
.TargetId
;
305 /* this identified the ide ctrl 0 or 1 */
306 blkdev
->path
= device_info
.PathId
;
308 dev_set_drvdata(device
, blkdev
);
310 /* Calculate the major and device num */
311 if (blkdev
->path
== 0) {
313 devnum
= blkdev
->path
+ blkdev
->target
; /* 0 or 1 */
315 if (!ide0_registered
) {
316 ret
= register_blkdev(major
, "ide");
318 DPRINT_ERR(BLKVSC_DRV
,
319 "register_blkdev() failed! ret %d",
326 } else if (blkdev
->path
== 1) {
328 devnum
= blkdev
->path
+ blkdev
->target
+ 1; /* 2 or 3 */
330 if (!ide1_registered
) {
331 ret
= register_blkdev(major
, "ide");
333 DPRINT_ERR(BLKVSC_DRV
,
334 "register_blkdev() failed! ret %d",
342 DPRINT_ERR(BLKVSC_DRV
, "invalid pathid");
347 DPRINT_INFO(BLKVSC_DRV
, "blkvsc registered for major %d!!", major
);
349 blkdev
->gd
= alloc_disk(BLKVSC_MINORS
);
351 DPRINT_ERR(BLKVSC_DRV
, "register_blkdev() failed! ret %d", ret
);
356 blkdev
->gd
->queue
= blk_init_queue(blkvsc_request
, &blkdev
->lock
);
358 blk_queue_max_segment_size(blkdev
->gd
->queue
, PAGE_SIZE
);
359 blk_queue_max_segments(blkdev
->gd
->queue
, MAX_MULTIPAGE_BUFFER_COUNT
);
360 blk_queue_segment_boundary(blkdev
->gd
->queue
, PAGE_SIZE
-1);
361 blk_queue_bounce_limit(blkdev
->gd
->queue
, BLK_BOUNCE_ANY
);
362 blk_queue_dma_alignment(blkdev
->gd
->queue
, 511);
364 blkdev
->gd
->major
= major
;
365 if (devnum
== 1 || devnum
== 3)
366 blkdev
->gd
->first_minor
= BLKVSC_MINORS
;
368 blkdev
->gd
->first_minor
= 0;
369 blkdev
->gd
->fops
= &block_ops
;
370 blkdev
->gd
->private_data
= blkdev
;
371 sprintf(blkdev
->gd
->disk_name
, "hd%c", 'a' + devnum
);
373 blkvsc_do_inquiry(blkdev
);
374 if (blkdev
->device_type
== DVD_TYPE
) {
375 set_disk_ro(blkdev
->gd
, 1);
376 blkdev
->gd
->flags
|= GENHD_FL_REMOVABLE
;
377 blkvsc_do_read_capacity(blkdev
);
379 blkvsc_do_read_capacity16(blkdev
);
382 set_capacity(blkdev
->gd
, blkdev
->capacity
* (blkdev
->sector_size
/512));
383 blk_queue_logical_block_size(blkdev
->gd
->queue
, blkdev
->sector_size
);
385 add_disk(blkdev
->gd
);
387 DPRINT_INFO(BLKVSC_DRV
, "%s added!! capacity %lu sector_size %d",
388 blkdev
->gd
->disk_name
, (unsigned long)blkdev
->capacity
,
389 blkdev
->sector_size
);
394 storvsc_drv_obj
->Base
.OnDeviceRemove(device_obj
);
398 if (blkdev
->request_pool
) {
399 kmem_cache_destroy(blkdev
->request_pool
);
400 blkdev
->request_pool
= NULL
;
409 static void blkvsc_shutdown(struct device
*device
)
411 struct block_device_context
*blkdev
= dev_get_drvdata(device
);
417 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_shutdown - users %d disk %s\n",
418 blkdev
->users
, blkdev
->gd
->disk_name
);
420 spin_lock_irqsave(&blkdev
->lock
, flags
);
422 blkdev
->shutting_down
= 1;
424 blk_stop_queue(blkdev
->gd
->queue
);
426 spin_unlock_irqrestore(&blkdev
->lock
, flags
);
428 while (blkdev
->num_outstanding_reqs
) {
429 DPRINT_INFO(STORVSC
, "waiting for %d requests to complete...",
430 blkdev
->num_outstanding_reqs
);
434 blkvsc_do_flush(blkdev
);
436 spin_lock_irqsave(&blkdev
->lock
, flags
);
438 blkvsc_cancel_pending_reqs(blkdev
);
440 spin_unlock_irqrestore(&blkdev
->lock
, flags
);
443 static int blkvsc_do_flush(struct block_device_context
*blkdev
)
445 struct blkvsc_request
*blkvsc_req
;
447 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_do_flush()\n");
449 if (blkdev
->device_type
!= HARDDISK_TYPE
)
452 blkvsc_req
= kmem_cache_alloc(blkdev
->request_pool
, GFP_KERNEL
);
456 memset(blkvsc_req
, 0, sizeof(struct blkvsc_request
));
457 init_waitqueue_head(&blkvsc_req
->wevent
);
458 blkvsc_req
->dev
= blkdev
;
459 blkvsc_req
->req
= NULL
;
460 blkvsc_req
->write
= 0;
462 blkvsc_req
->request
.DataBuffer
.PfnArray
[0] = 0;
463 blkvsc_req
->request
.DataBuffer
.Offset
= 0;
464 blkvsc_req
->request
.DataBuffer
.Length
= 0;
466 blkvsc_req
->cmnd
[0] = SYNCHRONIZE_CACHE
;
467 blkvsc_req
->cmd_len
= 10;
470 * Set this here since the completion routine may be invoked and
471 * completed before we return
473 blkvsc_req
->cond
= 0;
474 blkvsc_submit_request(blkvsc_req
, blkvsc_cmd_completion
);
476 wait_event_interruptible(blkvsc_req
->wevent
, blkvsc_req
->cond
);
478 kmem_cache_free(blkvsc_req
->dev
->request_pool
, blkvsc_req
);
483 /* Do a scsi INQUIRY cmd here to get the device type (ie disk or dvd) */
484 static int blkvsc_do_inquiry(struct block_device_context
*blkdev
)
486 struct blkvsc_request
*blkvsc_req
;
487 struct page
*page_buf
;
489 unsigned char device_type
;
491 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_do_inquiry()\n");
493 blkvsc_req
= kmem_cache_alloc(blkdev
->request_pool
, GFP_KERNEL
);
497 memset(blkvsc_req
, 0, sizeof(struct blkvsc_request
));
498 page_buf
= alloc_page(GFP_KERNEL
);
500 kmem_cache_free(blkvsc_req
->dev
->request_pool
, blkvsc_req
);
504 init_waitqueue_head(&blkvsc_req
->wevent
);
505 blkvsc_req
->dev
= blkdev
;
506 blkvsc_req
->req
= NULL
;
507 blkvsc_req
->write
= 0;
509 blkvsc_req
->request
.DataBuffer
.PfnArray
[0] = page_to_pfn(page_buf
);
510 blkvsc_req
->request
.DataBuffer
.Offset
= 0;
511 blkvsc_req
->request
.DataBuffer
.Length
= 64;
513 blkvsc_req
->cmnd
[0] = INQUIRY
;
514 blkvsc_req
->cmnd
[1] = 0x1; /* Get product data */
515 blkvsc_req
->cmnd
[2] = 0x83; /* mode page 83 */
516 blkvsc_req
->cmnd
[4] = 64;
517 blkvsc_req
->cmd_len
= 6;
520 * Set this here since the completion routine may be invoked and
521 * completed before we return
523 blkvsc_req
->cond
= 0;
525 blkvsc_submit_request(blkvsc_req
, blkvsc_cmd_completion
);
527 DPRINT_DBG(BLKVSC_DRV
, "waiting %p to complete - cond %d\n",
528 blkvsc_req
, blkvsc_req
->cond
);
530 wait_event_interruptible(blkvsc_req
->wevent
, blkvsc_req
->cond
);
532 buf
= kmap(page_buf
);
534 /* print_hex_dump_bytes("", DUMP_PREFIX_NONE, buf, 64); */
536 device_type
= buf
[0] & 0x1F;
538 if (device_type
== 0x0) {
539 blkdev
->device_type
= HARDDISK_TYPE
;
540 } else if (device_type
== 0x5) {
541 blkdev
->device_type
= DVD_TYPE
;
543 /* TODO: this is currently unsupported device type */
544 blkdev
->device_type
= UNKNOWN_DEV_TYPE
;
547 DPRINT_DBG(BLKVSC_DRV
, "device type %d\n", device_type
);
549 blkdev
->device_id_len
= buf
[7];
550 if (blkdev
->device_id_len
> 64)
551 blkdev
->device_id_len
= 64;
553 memcpy(blkdev
->device_id
, &buf
[8], blkdev
->device_id_len
);
554 /* printk_hex_dump_bytes("", DUMP_PREFIX_NONE, blkdev->device_id,
555 * blkdev->device_id_len); */
559 __free_page(page_buf
);
561 kmem_cache_free(blkvsc_req
->dev
->request_pool
, blkvsc_req
);
566 /* Do a scsi READ_CAPACITY cmd here to get the size of the disk */
567 static int blkvsc_do_read_capacity(struct block_device_context
*blkdev
)
569 struct blkvsc_request
*blkvsc_req
;
570 struct page
*page_buf
;
572 struct scsi_sense_hdr sense_hdr
;
574 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_do_read_capacity()\n");
576 blkdev
->sector_size
= 0;
577 blkdev
->capacity
= 0;
578 blkdev
->media_not_present
= 0; /* assume a disk is present */
580 blkvsc_req
= kmem_cache_alloc(blkdev
->request_pool
, GFP_KERNEL
);
584 memset(blkvsc_req
, 0, sizeof(struct blkvsc_request
));
585 page_buf
= alloc_page(GFP_KERNEL
);
587 kmem_cache_free(blkvsc_req
->dev
->request_pool
, blkvsc_req
);
591 init_waitqueue_head(&blkvsc_req
->wevent
);
592 blkvsc_req
->dev
= blkdev
;
593 blkvsc_req
->req
= NULL
;
594 blkvsc_req
->write
= 0;
596 blkvsc_req
->request
.DataBuffer
.PfnArray
[0] = page_to_pfn(page_buf
);
597 blkvsc_req
->request
.DataBuffer
.Offset
= 0;
598 blkvsc_req
->request
.DataBuffer
.Length
= 8;
600 blkvsc_req
->cmnd
[0] = READ_CAPACITY
;
601 blkvsc_req
->cmd_len
= 16;
604 * Set this here since the completion routine may be invoked
605 * and completed before we return
607 blkvsc_req
->cond
= 0;
609 blkvsc_submit_request(blkvsc_req
, blkvsc_cmd_completion
);
611 DPRINT_DBG(BLKVSC_DRV
, "waiting %p to complete - cond %d\n",
612 blkvsc_req
, blkvsc_req
->cond
);
614 wait_event_interruptible(blkvsc_req
->wevent
, blkvsc_req
->cond
);
617 if (blkvsc_req
->request
.Status
) {
618 scsi_normalize_sense(blkvsc_req
->sense_buffer
,
619 SCSI_SENSE_BUFFERSIZE
, &sense_hdr
);
621 if (sense_hdr
.asc
== 0x3A) {
622 /* Medium not present */
623 blkdev
->media_not_present
= 1;
627 buf
= kmap(page_buf
);
630 blkdev
->capacity
= ((buf
[0] << 24) | (buf
[1] << 16) |
631 (buf
[2] << 8) | buf
[3]) + 1;
632 blkdev
->sector_size
= (buf
[4] << 24) | (buf
[5] << 16) |
633 (buf
[6] << 8) | buf
[7];
637 __free_page(page_buf
);
639 kmem_cache_free(blkvsc_req
->dev
->request_pool
, blkvsc_req
);
644 static int blkvsc_do_read_capacity16(struct block_device_context
*blkdev
)
646 struct blkvsc_request
*blkvsc_req
;
647 struct page
*page_buf
;
649 struct scsi_sense_hdr sense_hdr
;
651 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_do_read_capacity16()\n");
653 blkdev
->sector_size
= 0;
654 blkdev
->capacity
= 0;
655 blkdev
->media_not_present
= 0; /* assume a disk is present */
657 blkvsc_req
= kmem_cache_alloc(blkdev
->request_pool
, GFP_KERNEL
);
661 memset(blkvsc_req
, 0, sizeof(struct blkvsc_request
));
662 page_buf
= alloc_page(GFP_KERNEL
);
664 kmem_cache_free(blkvsc_req
->dev
->request_pool
, blkvsc_req
);
668 init_waitqueue_head(&blkvsc_req
->wevent
);
669 blkvsc_req
->dev
= blkdev
;
670 blkvsc_req
->req
= NULL
;
671 blkvsc_req
->write
= 0;
673 blkvsc_req
->request
.DataBuffer
.PfnArray
[0] = page_to_pfn(page_buf
);
674 blkvsc_req
->request
.DataBuffer
.Offset
= 0;
675 blkvsc_req
->request
.DataBuffer
.Length
= 12;
677 blkvsc_req
->cmnd
[0] = 0x9E; /* READ_CAPACITY16; */
678 blkvsc_req
->cmd_len
= 16;
681 * Set this here since the completion routine may be invoked
682 * and completed before we return
684 blkvsc_req
->cond
= 0;
686 blkvsc_submit_request(blkvsc_req
, blkvsc_cmd_completion
);
688 DPRINT_DBG(BLKVSC_DRV
, "waiting %p to complete - cond %d\n",
689 blkvsc_req
, blkvsc_req
->cond
);
691 wait_event_interruptible(blkvsc_req
->wevent
, blkvsc_req
->cond
);
694 if (blkvsc_req
->request
.Status
) {
695 scsi_normalize_sense(blkvsc_req
->sense_buffer
,
696 SCSI_SENSE_BUFFERSIZE
, &sense_hdr
);
697 if (sense_hdr
.asc
== 0x3A) {
698 /* Medium not present */
699 blkdev
->media_not_present
= 1;
703 buf
= kmap(page_buf
);
706 blkdev
->capacity
= be64_to_cpu(*(unsigned long long *) &buf
[0]) + 1;
707 blkdev
->sector_size
= be32_to_cpu(*(unsigned int *)&buf
[8]);
710 blkdev
->capacity
= ((buf
[0] << 24) | (buf
[1] << 16) |
711 (buf
[2] << 8) | buf
[3]) + 1;
712 blkdev
->sector_size
= (buf
[4] << 24) | (buf
[5] << 16) |
713 (buf
[6] << 8) | buf
[7];
718 __free_page(page_buf
);
720 kmem_cache_free(blkvsc_req
->dev
->request_pool
, blkvsc_req
);
726 * blkvsc_remove() - Callback when our device is removed
728 static int blkvsc_remove(struct device
*device
)
730 struct driver_context
*driver_ctx
=
731 driver_to_driver_context(device
->driver
);
732 struct blkvsc_driver_context
*blkvsc_drv_ctx
=
733 (struct blkvsc_driver_context
*)driver_ctx
;
734 struct storvsc_driver_object
*storvsc_drv_obj
=
735 &blkvsc_drv_ctx
->drv_obj
;
736 struct vm_device
*device_ctx
= device_to_vm_device(device
);
737 struct hv_device
*device_obj
= &device_ctx
->device_obj
;
738 struct block_device_context
*blkdev
= dev_get_drvdata(device
);
742 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_remove()\n");
744 if (!storvsc_drv_obj
->Base
.OnDeviceRemove
)
748 * Call to the vsc driver to let it know that the device is being
751 ret
= storvsc_drv_obj
->Base
.OnDeviceRemove(device_obj
);
754 DPRINT_ERR(BLKVSC_DRV
,
755 "unable to remove blkvsc device (ret %d)", ret
);
758 /* Get to a known state */
759 spin_lock_irqsave(&blkdev
->lock
, flags
);
761 blkdev
->shutting_down
= 1;
763 blk_stop_queue(blkdev
->gd
->queue
);
765 spin_unlock_irqrestore(&blkdev
->lock
, flags
);
767 while (blkdev
->num_outstanding_reqs
) {
768 DPRINT_INFO(STORVSC
, "waiting for %d requests to complete...",
769 blkdev
->num_outstanding_reqs
);
773 blkvsc_do_flush(blkdev
);
775 spin_lock_irqsave(&blkdev
->lock
, flags
);
777 blkvsc_cancel_pending_reqs(blkdev
);
779 spin_unlock_irqrestore(&blkdev
->lock
, flags
);
781 blk_cleanup_queue(blkdev
->gd
->queue
);
783 del_gendisk(blkdev
->gd
);
785 kmem_cache_destroy(blkdev
->request_pool
);
792 static void blkvsc_init_rw(struct blkvsc_request
*blkvsc_req
)
794 /* ASSERT(blkvsc_req->req); */
795 /* ASSERT(blkvsc_req->sector_count <= (MAX_MULTIPAGE_BUFFER_COUNT*8)); */
797 blkvsc_req
->cmd_len
= 16;
799 if (blkvsc_req
->sector_start
> 0xffffffff) {
800 if (rq_data_dir(blkvsc_req
->req
)) {
801 blkvsc_req
->write
= 1;
802 blkvsc_req
->cmnd
[0] = WRITE_16
;
804 blkvsc_req
->write
= 0;
805 blkvsc_req
->cmnd
[0] = READ_16
;
808 blkvsc_req
->cmnd
[1] |= blk_fua_rq(blkvsc_req
->req
) ? 0x8 : 0;
810 *(unsigned long long *)&blkvsc_req
->cmnd
[2] =
811 cpu_to_be64(blkvsc_req
->sector_start
);
812 *(unsigned int *)&blkvsc_req
->cmnd
[10] =
813 cpu_to_be32(blkvsc_req
->sector_count
);
814 } else if ((blkvsc_req
->sector_count
> 0xff) ||
815 (blkvsc_req
->sector_start
> 0x1fffff)) {
816 if (rq_data_dir(blkvsc_req
->req
)) {
817 blkvsc_req
->write
= 1;
818 blkvsc_req
->cmnd
[0] = WRITE_10
;
820 blkvsc_req
->write
= 0;
821 blkvsc_req
->cmnd
[0] = READ_10
;
824 blkvsc_req
->cmnd
[1] |= blk_fua_rq(blkvsc_req
->req
) ? 0x8 : 0;
826 *(unsigned int *)&blkvsc_req
->cmnd
[2] =
827 cpu_to_be32(blkvsc_req
->sector_start
);
828 *(unsigned short *)&blkvsc_req
->cmnd
[7] =
829 cpu_to_be16(blkvsc_req
->sector_count
);
831 if (rq_data_dir(blkvsc_req
->req
)) {
832 blkvsc_req
->write
= 1;
833 blkvsc_req
->cmnd
[0] = WRITE_6
;
835 blkvsc_req
->write
= 0;
836 blkvsc_req
->cmnd
[0] = READ_6
;
839 *(unsigned int *)&blkvsc_req
->cmnd
[1] =
840 cpu_to_be32(blkvsc_req
->sector_start
) >> 8;
841 blkvsc_req
->cmnd
[1] &= 0x1f;
842 blkvsc_req
->cmnd
[4] = (unsigned char)blkvsc_req
->sector_count
;
846 static int blkvsc_submit_request(struct blkvsc_request
*blkvsc_req
,
847 void (*request_completion
)(struct hv_storvsc_request
*))
849 struct block_device_context
*blkdev
= blkvsc_req
->dev
;
850 struct vm_device
*device_ctx
= blkdev
->device_ctx
;
851 struct driver_context
*driver_ctx
=
852 driver_to_driver_context(device_ctx
->device
.driver
);
853 struct blkvsc_driver_context
*blkvsc_drv_ctx
=
854 (struct blkvsc_driver_context
*)driver_ctx
;
855 struct storvsc_driver_object
*storvsc_drv_obj
=
856 &blkvsc_drv_ctx
->drv_obj
;
857 struct hv_storvsc_request
*storvsc_req
;
860 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_submit_request() - "
861 "req %p type %s start_sector %lu count %ld offset %d "
862 "len %d\n", blkvsc_req
,
863 (blkvsc_req
->write
) ? "WRITE" : "READ",
864 (unsigned long) blkvsc_req
->sector_start
,
865 blkvsc_req
->sector_count
,
866 blkvsc_req
->request
.DataBuffer
.Offset
,
867 blkvsc_req
->request
.DataBuffer
.Length
);
869 for (i
= 0; i
< (blkvsc_req
->request
.DataBuffer
.Length
>> 12); i
++) {
870 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_submit_request() - "
871 "req %p pfn[%d] %llx\n",
873 blkvsc_req
->request
.DataBuffer
.PfnArray
[i
]);
877 storvsc_req
= &blkvsc_req
->request
;
878 storvsc_req
->Extension
= (void *)((unsigned long)blkvsc_req
+
879 sizeof(struct blkvsc_request
));
881 storvsc_req
->Type
= blkvsc_req
->write
? WRITE_TYPE
: READ_TYPE
;
883 storvsc_req
->OnIOCompletion
= request_completion
;
884 storvsc_req
->Context
= blkvsc_req
;
886 storvsc_req
->Host
= blkdev
->port
;
887 storvsc_req
->Bus
= blkdev
->path
;
888 storvsc_req
->TargetId
= blkdev
->target
;
889 storvsc_req
->LunId
= 0; /* this is not really used at all */
891 storvsc_req
->CdbLen
= blkvsc_req
->cmd_len
;
892 storvsc_req
->Cdb
= blkvsc_req
->cmnd
;
894 storvsc_req
->SenseBuffer
= blkvsc_req
->sense_buffer
;
895 storvsc_req
->SenseBufferSize
= SCSI_SENSE_BUFFERSIZE
;
897 ret
= storvsc_drv_obj
->OnIORequest(&blkdev
->device_ctx
->device_obj
,
898 &blkvsc_req
->request
);
900 blkdev
->num_outstanding_reqs
++;
906 * We break the request into 1 or more blkvsc_requests and submit
907 * them. If we cant submit them all, we put them on the
908 * pending_list. The blkvsc_request() will work on the pending_list.
910 static int blkvsc_do_request(struct block_device_context
*blkdev
,
913 struct bio
*bio
= NULL
;
914 struct bio_vec
*bvec
= NULL
;
915 struct bio_vec
*prev_bvec
= NULL
;
916 struct blkvsc_request
*blkvsc_req
= NULL
;
917 struct blkvsc_request
*tmp
;
920 sector_t start_sector
;
921 unsigned long num_sectors
= 0;
924 struct blkvsc_request_group
*group
= NULL
;
926 DPRINT_DBG(BLKVSC_DRV
, "blkdev %p req %p sect %lu\n", blkdev
, req
,
927 (unsigned long)blk_rq_pos(req
));
929 /* Create a group to tie req to list of blkvsc_reqs */
930 group
= kmem_cache_alloc(blkdev
->request_pool
, GFP_ATOMIC
);
934 INIT_LIST_HEAD(&group
->blkvsc_req_list
);
935 group
->outstanding
= group
->status
= 0;
937 start_sector
= blk_rq_pos(req
);
939 /* foreach bio in the request */
941 for (bio
= req
->bio
; bio
; bio
= bio
->bi_next
) {
943 * Map this bio into an existing or new storvsc request
945 bio_for_each_segment(bvec
, bio
, seg_idx
) {
946 DPRINT_DBG(BLKVSC_DRV
, "bio_for_each_segment() "
947 "- req %p bio %p bvec %p seg_idx %d "
948 "databuf_idx %d\n", req
, bio
, bvec
,
949 seg_idx
, databuf_idx
);
951 /* Get a new storvsc request */
954 (databuf_idx
>= MAX_MULTIPAGE_BUFFER_COUNT
)
955 /* hole at the begin of page */
956 || (bvec
->bv_offset
!= 0) ||
957 /* hold at the end of page */
959 (prev_bvec
->bv_len
!= PAGE_SIZE
))) {
960 /* submit the prev one */
962 blkvsc_req
->sector_start
= start_sector
;
963 sector_div(blkvsc_req
->sector_start
, (blkdev
->sector_size
>> 9));
965 blkvsc_req
->sector_count
= num_sectors
/ (blkdev
->sector_size
>> 9);
966 blkvsc_init_rw(blkvsc_req
);
970 * Create new blkvsc_req to represent
973 blkvsc_req
= kmem_cache_alloc(blkdev
->request_pool
, GFP_ATOMIC
);
975 /* free up everything */
976 list_for_each_entry_safe(
978 &group
->blkvsc_req_list
,
980 list_del(&blkvsc_req
->req_entry
);
981 kmem_cache_free(blkdev
->request_pool
, blkvsc_req
);
984 kmem_cache_free(blkdev
->request_pool
, group
);
988 memset(blkvsc_req
, 0,
989 sizeof(struct blkvsc_request
));
991 blkvsc_req
->dev
= blkdev
;
992 blkvsc_req
->req
= req
;
993 blkvsc_req
->request
.DataBuffer
.Offset
= bvec
->bv_offset
;
994 blkvsc_req
->request
.DataBuffer
.Length
= 0;
996 /* Add to the group */
997 blkvsc_req
->group
= group
;
998 blkvsc_req
->group
->outstanding
++;
999 list_add_tail(&blkvsc_req
->req_entry
,
1000 &blkvsc_req
->group
->blkvsc_req_list
);
1002 start_sector
+= num_sectors
;
1007 /* Add the curr bvec/segment to the curr blkvsc_req */
1008 blkvsc_req
->request
.DataBuffer
.PfnArray
[databuf_idx
] = page_to_pfn(bvec
->bv_page
);
1009 blkvsc_req
->request
.DataBuffer
.Length
+= bvec
->bv_len
;
1014 num_sectors
+= bvec
->bv_len
>> 9;
1016 } /* bio_for_each_segment */
1018 } /* rq_for_each_bio */
1021 /* Handle the last one */
1023 DPRINT_DBG(BLKVSC_DRV
, "blkdev %p req %p group %p count %d\n",
1024 blkdev
, req
, blkvsc_req
->group
,
1025 blkvsc_req
->group
->outstanding
);
1027 blkvsc_req
->sector_start
= start_sector
;
1028 sector_div(blkvsc_req
->sector_start
,
1029 (blkdev
->sector_size
>> 9));
1031 blkvsc_req
->sector_count
= num_sectors
/
1032 (blkdev
->sector_size
>> 9);
1034 blkvsc_init_rw(blkvsc_req
);
1037 list_for_each_entry(blkvsc_req
, &group
->blkvsc_req_list
, req_entry
) {
1039 DPRINT_DBG(BLKVSC_DRV
, "adding blkvsc_req to "
1040 "pending_list - blkvsc_req %p start_sect %lu"
1041 " sect_count %ld (%lu %ld)\n", blkvsc_req
,
1042 (unsigned long)blkvsc_req
->sector_start
,
1043 blkvsc_req
->sector_count
,
1044 (unsigned long)start_sector
,
1045 (unsigned long)num_sectors
);
1047 list_add_tail(&blkvsc_req
->pend_entry
,
1048 &blkdev
->pending_list
);
1050 ret
= blkvsc_submit_request(blkvsc_req
,
1051 blkvsc_request_completion
);
1054 list_add_tail(&blkvsc_req
->pend_entry
,
1055 &blkdev
->pending_list
);
1058 DPRINT_DBG(BLKVSC_DRV
, "submitted blkvsc_req %p "
1059 "start_sect %lu sect_count %ld (%lu %ld) "
1060 "ret %d\n", blkvsc_req
,
1061 (unsigned long)blkvsc_req
->sector_start
,
1062 blkvsc_req
->sector_count
,
1063 (unsigned long)start_sector
,
1071 static void blkvsc_cmd_completion(struct hv_storvsc_request
*request
)
1073 struct blkvsc_request
*blkvsc_req
=
1074 (struct blkvsc_request
*)request
->Context
;
1075 struct block_device_context
*blkdev
=
1076 (struct block_device_context
*)blkvsc_req
->dev
;
1077 struct scsi_sense_hdr sense_hdr
;
1079 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_cmd_completion() - req %p\n",
1082 blkdev
->num_outstanding_reqs
--;
1084 if (blkvsc_req
->request
.Status
)
1085 if (scsi_normalize_sense(blkvsc_req
->sense_buffer
,
1086 SCSI_SENSE_BUFFERSIZE
, &sense_hdr
))
1087 scsi_print_sense_hdr("blkvsc", &sense_hdr
);
1089 blkvsc_req
->cond
= 1;
1090 wake_up_interruptible(&blkvsc_req
->wevent
);
1093 static void blkvsc_request_completion(struct hv_storvsc_request
*request
)
1095 struct blkvsc_request
*blkvsc_req
=
1096 (struct blkvsc_request
*)request
->Context
;
1097 struct block_device_context
*blkdev
=
1098 (struct block_device_context
*)blkvsc_req
->dev
;
1099 unsigned long flags
;
1100 struct blkvsc_request
*comp_req
, *tmp
;
1102 /* ASSERT(blkvsc_req->group); */
1104 DPRINT_DBG(BLKVSC_DRV
, "blkdev %p blkvsc_req %p group %p type %s "
1105 "sect_start %lu sect_count %ld len %d group outstd %d "
1106 "total outstd %d\n",
1107 blkdev
, blkvsc_req
, blkvsc_req
->group
,
1108 (blkvsc_req
->write
) ? "WRITE" : "READ",
1109 (unsigned long)blkvsc_req
->sector_start
,
1110 blkvsc_req
->sector_count
,
1111 blkvsc_req
->request
.DataBuffer
.Length
,
1112 blkvsc_req
->group
->outstanding
,
1113 blkdev
->num_outstanding_reqs
);
1115 spin_lock_irqsave(&blkdev
->lock
, flags
);
1117 blkdev
->num_outstanding_reqs
--;
1118 blkvsc_req
->group
->outstanding
--;
1121 * Only start processing when all the blkvsc_reqs are
1122 * completed. This guarantees no out-of-order blkvsc_req
1123 * completion when calling end_that_request_first()
1125 if (blkvsc_req
->group
->outstanding
== 0) {
1126 list_for_each_entry_safe(comp_req
, tmp
,
1127 &blkvsc_req
->group
->blkvsc_req_list
,
1129 DPRINT_DBG(BLKVSC_DRV
, "completing blkvsc_req %p "
1130 "sect_start %lu sect_count %ld\n",
1132 (unsigned long)comp_req
->sector_start
,
1133 comp_req
->sector_count
);
1135 list_del(&comp_req
->req_entry
);
1137 if (!__blk_end_request(comp_req
->req
,
1138 (!comp_req
->request
.Status
? 0 : -EIO
),
1139 comp_req
->sector_count
* blkdev
->sector_size
)) {
1141 * All the sectors have been xferred ie the
1144 DPRINT_DBG(BLKVSC_DRV
, "req %p COMPLETED\n",
1146 kmem_cache_free(blkdev
->request_pool
,
1150 kmem_cache_free(blkdev
->request_pool
, comp_req
);
1153 if (!blkdev
->shutting_down
) {
1154 blkvsc_do_pending_reqs(blkdev
);
1155 blk_start_queue(blkdev
->gd
->queue
);
1156 blkvsc_request(blkdev
->gd
->queue
);
1160 spin_unlock_irqrestore(&blkdev
->lock
, flags
);
1163 static int blkvsc_cancel_pending_reqs(struct block_device_context
*blkdev
)
1165 struct blkvsc_request
*pend_req
, *tmp
;
1166 struct blkvsc_request
*comp_req
, *tmp2
;
1170 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_cancel_pending_reqs()");
1172 /* Flush the pending list first */
1173 list_for_each_entry_safe(pend_req
, tmp
, &blkdev
->pending_list
,
1176 * The pend_req could be part of a partially completed
1177 * request. If so, complete those req first until we
1180 list_for_each_entry_safe(comp_req
, tmp2
,
1181 &pend_req
->group
->blkvsc_req_list
,
1183 DPRINT_DBG(BLKVSC_DRV
, "completing blkvsc_req %p "
1184 "sect_start %lu sect_count %ld\n",
1186 (unsigned long) comp_req
->sector_start
,
1187 comp_req
->sector_count
);
1189 if (comp_req
== pend_req
)
1192 list_del(&comp_req
->req_entry
);
1194 if (comp_req
->req
) {
1195 ret
= __blk_end_request(comp_req
->req
,
1196 (!comp_req
->request
.Status
? 0 : -EIO
),
1197 comp_req
->sector_count
*
1198 blkdev
->sector_size
);
1200 /* FIXME: shouldn't this do more than return? */
1205 kmem_cache_free(blkdev
->request_pool
, comp_req
);
1208 DPRINT_DBG(BLKVSC_DRV
, "cancelling pending request - %p\n",
1211 list_del(&pend_req
->pend_entry
);
1213 list_del(&pend_req
->req_entry
);
1215 if (comp_req
->req
) {
1216 if (!__blk_end_request(pend_req
->req
, -EIO
,
1217 pend_req
->sector_count
*
1218 blkdev
->sector_size
)) {
1220 * All the sectors have been xferred ie the
1223 DPRINT_DBG(BLKVSC_DRV
,
1224 "blkvsc_cancel_pending_reqs() - "
1225 "req %p COMPLETED\n", pend_req
->req
);
1226 kmem_cache_free(blkdev
->request_pool
,
1231 kmem_cache_free(blkdev
->request_pool
, pend_req
);
1238 static int blkvsc_do_pending_reqs(struct block_device_context
*blkdev
)
1240 struct blkvsc_request
*pend_req
, *tmp
;
1243 /* Flush the pending list first */
1244 list_for_each_entry_safe(pend_req
, tmp
, &blkdev
->pending_list
,
1246 DPRINT_DBG(BLKVSC_DRV
, "working off pending_list - %p\n",
1249 ret
= blkvsc_submit_request(pend_req
,
1250 blkvsc_request_completion
);
1254 list_del(&pend_req
->pend_entry
);
1260 static void blkvsc_request(struct request_queue
*queue
)
1262 struct block_device_context
*blkdev
= NULL
;
1263 struct request
*req
;
1266 DPRINT_DBG(BLKVSC_DRV
, "- enter\n");
1267 while ((req
= blk_peek_request(queue
)) != NULL
) {
1268 DPRINT_DBG(BLKVSC_DRV
, "- req %p\n", req
);
1270 blkdev
= req
->rq_disk
->private_data
;
1271 if (blkdev
->shutting_down
|| !blk_fs_request(req
) ||
1272 blkdev
->media_not_present
) {
1273 __blk_end_request_cur(req
, 0);
1277 ret
= blkvsc_do_pending_reqs(blkdev
);
1280 DPRINT_DBG(BLKVSC_DRV
,
1281 "- stop queue - pending_list not empty\n");
1282 blk_stop_queue(queue
);
1286 blk_start_request(req
);
1288 ret
= blkvsc_do_request(blkdev
, req
);
1290 DPRINT_DBG(BLKVSC_DRV
, "- stop queue - no room\n");
1291 blk_stop_queue(queue
);
1293 } else if (ret
< 0) {
1294 DPRINT_DBG(BLKVSC_DRV
, "- stop queue - no mem\n");
1295 blk_requeue_request(queue
, req
);
1296 blk_stop_queue(queue
);
1302 static int blkvsc_open(struct block_device
*bdev
, fmode_t mode
)
1304 struct block_device_context
*blkdev
= bdev
->bd_disk
->private_data
;
1306 DPRINT_DBG(BLKVSC_DRV
, "- users %d disk %s\n", blkdev
->users
,
1307 blkdev
->gd
->disk_name
);
1309 spin_lock(&blkdev
->lock
);
1311 if (!blkdev
->users
&& blkdev
->device_type
== DVD_TYPE
) {
1312 spin_unlock(&blkdev
->lock
);
1313 check_disk_change(bdev
);
1314 spin_lock(&blkdev
->lock
);
1319 spin_unlock(&blkdev
->lock
);
1323 static int blkvsc_release(struct gendisk
*disk
, fmode_t mode
)
1325 struct block_device_context
*blkdev
= disk
->private_data
;
1327 DPRINT_DBG(BLKVSC_DRV
, "- users %d disk %s\n", blkdev
->users
,
1328 blkdev
->gd
->disk_name
);
1330 spin_lock(&blkdev
->lock
);
1331 if (blkdev
->users
== 1) {
1332 spin_unlock(&blkdev
->lock
);
1333 blkvsc_do_flush(blkdev
);
1334 spin_lock(&blkdev
->lock
);
1339 spin_unlock(&blkdev
->lock
);
1343 static int blkvsc_media_changed(struct gendisk
*gd
)
1345 DPRINT_DBG(BLKVSC_DRV
, "- enter\n");
1349 static int blkvsc_revalidate_disk(struct gendisk
*gd
)
1351 struct block_device_context
*blkdev
= gd
->private_data
;
1353 DPRINT_DBG(BLKVSC_DRV
, "- enter\n");
1355 if (blkdev
->device_type
== DVD_TYPE
) {
1356 blkvsc_do_read_capacity(blkdev
);
1357 set_capacity(blkdev
->gd
, blkdev
->capacity
*
1358 (blkdev
->sector_size
/512));
1359 blk_queue_logical_block_size(gd
->queue
, blkdev
->sector_size
);
1364 static int blkvsc_getgeo(struct block_device
*bd
, struct hd_geometry
*hg
)
1366 sector_t total_sectors
= get_capacity(bd
->bd_disk
);
1367 sector_t cylinder_times_heads
= 0;
1370 int sectors_per_track
= 0;
1375 if (total_sectors
> (65535 * 16 * 255))
1376 total_sectors
= (65535 * 16 * 255);
1378 if (total_sectors
>= (65535 * 16 * 63)) {
1379 sectors_per_track
= 255;
1382 cylinder_times_heads
= total_sectors
;
1383 /* sector_div stores the quotient in cylinder_times_heads */
1384 rem
= sector_div(cylinder_times_heads
, sectors_per_track
);
1386 sectors_per_track
= 17;
1388 cylinder_times_heads
= total_sectors
;
1389 /* sector_div stores the quotient in cylinder_times_heads */
1390 rem
= sector_div(cylinder_times_heads
, sectors_per_track
);
1392 temp
= cylinder_times_heads
+ 1023;
1393 /* sector_div stores the quotient in temp */
1394 rem
= sector_div(temp
, 1024);
1402 if (cylinder_times_heads
>= (heads
* 1024) || (heads
> 16)) {
1403 sectors_per_track
= 31;
1406 cylinder_times_heads
= total_sectors
;
1408 * sector_div stores the quotient in
1409 * cylinder_times_heads
1411 rem
= sector_div(cylinder_times_heads
,
1415 if (cylinder_times_heads
>= (heads
* 1024)) {
1416 sectors_per_track
= 63;
1419 cylinder_times_heads
= total_sectors
;
1421 * sector_div stores the quotient in
1422 * cylinder_times_heads
1424 rem
= sector_div(cylinder_times_heads
,
1429 temp
= cylinder_times_heads
;
1430 /* sector_div stores the quotient in temp */
1431 rem
= sector_div(temp
, heads
);
1435 hg
->sectors
= sectors_per_track
;
1436 hg
->cylinders
= cylinders
;
1438 DPRINT_INFO(BLKVSC_DRV
, "CHS (%d, %d, %d)", cylinders
, heads
,
1444 static int blkvsc_ioctl(struct block_device
*bd
, fmode_t mode
,
1445 unsigned cmd
, unsigned long argument
)
1447 /* struct block_device_context *blkdev = bd->bd_disk->private_data; */
1452 * TODO: I think there is certain format for HDIO_GET_IDENTITY rather
1453 * than just a GUID. Commented it out for now.
1456 case HDIO_GET_IDENTITY
:
1457 DPRINT_INFO(BLKVSC_DRV
, "HDIO_GET_IDENTITY\n");
1458 if (copy_to_user((void __user
*)arg
, blkdev
->device_id
,
1459 blkdev
->device_id_len
))
1471 static int __init
blkvsc_init(void)
1475 BUILD_BUG_ON(sizeof(sector_t
) != 8);
1477 DPRINT_INFO(BLKVSC_DRV
, "Blkvsc initializing....");
1479 ret
= blkvsc_drv_init(BlkVscInitialize
);
1484 static void __exit
blkvsc_exit(void)
1489 MODULE_LICENSE("GPL");
1490 MODULE_VERSION(HV_DRV_VERSION
);
1491 MODULE_DESCRIPTION("Microsoft Hyper-V virtual block driver");
1492 module_init(blkvsc_init
);
1493 module_exit(blkvsc_exit
);