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/smp_lock.h>
29 #include <linux/slab.h>
30 #include <scsi/scsi.h>
31 #include <scsi/scsi_cmnd.h>
32 #include <scsi/scsi_eh.h>
33 #include <scsi/scsi_dbg.h>
36 #include "version_info.h"
38 #include "storvsc_api.h"
41 #define BLKVSC_MINORS 64
43 enum blkvsc_device_type
{
50 * This request ties the struct request and struct
51 * blkvsc_request/hv_storvsc_request together A struct request may be
52 * represented by 1 or more struct blkvsc_request
54 struct blkvsc_request_group
{
57 struct list_head blkvsc_req_list
; /* list of blkvsc_requests */
60 struct blkvsc_request
{
61 /* blkvsc_request_group.blkvsc_req_list */
62 struct list_head req_entry
;
64 /* block_device_context.pending_list */
65 struct list_head pend_entry
;
67 /* This may be null if we generate a request internally */
70 struct block_device_context
*dev
;
72 /* The group this request is part of. Maybe null */
73 struct blkvsc_request_group
*group
;
75 wait_queue_head_t wevent
;
79 sector_t sector_start
;
80 unsigned long sector_count
;
82 unsigned char sense_buffer
[SCSI_SENSE_BUFFERSIZE
];
83 unsigned char cmd_len
;
84 unsigned char cmnd
[MAX_COMMAND_SIZE
];
86 struct hv_storvsc_request request
;
88 * !!!DO NOT ADD ANYTHING BELOW HERE!!! Otherwise, memory can overlap,
89 * because - The extension buffer falls right here and is pointed to by
91 * Which sounds like a horrible idea, who designed this?
95 /* Per device structure */
96 struct block_device_context
{
97 /* point back to our device context */
98 struct vm_device
*device_ctx
;
99 struct kmem_cache
*request_pool
;
102 enum blkvsc_device_type device_type
;
103 struct list_head pending_list
;
105 unsigned char device_id
[64];
106 unsigned int device_id_len
;
107 int num_outstanding_reqs
;
109 int media_not_present
;
110 unsigned int sector_size
;
114 unsigned char target
;
119 struct blkvsc_driver_context
{
120 /* !! These must be the first 2 fields !! */
121 /* FIXME this is a bug! */
122 struct driver_context drv_ctx
;
123 struct storvsc_driver_object drv_obj
;
127 static int blkvsc_probe(struct device
*dev
);
128 static int blkvsc_remove(struct device
*device
);
129 static void blkvsc_shutdown(struct device
*device
);
131 static int blkvsc_open(struct block_device
*bdev
, fmode_t mode
);
132 static int blkvsc_release(struct gendisk
*disk
, fmode_t mode
);
133 static int blkvsc_media_changed(struct gendisk
*gd
);
134 static int blkvsc_revalidate_disk(struct gendisk
*gd
);
135 static int blkvsc_getgeo(struct block_device
*bd
, struct hd_geometry
*hg
);
136 static int blkvsc_ioctl(struct block_device
*bd
, fmode_t mode
,
137 unsigned cmd
, unsigned long argument
);
138 static void blkvsc_request(struct request_queue
*queue
);
139 static void blkvsc_request_completion(struct hv_storvsc_request
*request
);
140 static int blkvsc_do_request(struct block_device_context
*blkdev
,
141 struct request
*req
);
142 static int blkvsc_submit_request(struct blkvsc_request
*blkvsc_req
,
143 void (*request_completion
)(struct hv_storvsc_request
*));
144 static void blkvsc_init_rw(struct blkvsc_request
*blkvsc_req
);
145 static void blkvsc_cmd_completion(struct hv_storvsc_request
*request
);
146 static int blkvsc_do_inquiry(struct block_device_context
*blkdev
);
147 static int blkvsc_do_read_capacity(struct block_device_context
*blkdev
);
148 static int blkvsc_do_read_capacity16(struct block_device_context
*blkdev
);
149 static int blkvsc_do_flush(struct block_device_context
*blkdev
);
150 static int blkvsc_cancel_pending_reqs(struct block_device_context
*blkdev
);
151 static int blkvsc_do_pending_reqs(struct block_device_context
*blkdev
);
153 static int blkvsc_ringbuffer_size
= BLKVSC_RING_BUFFER_SIZE
;
154 module_param(blkvsc_ringbuffer_size
, int, S_IRUGO
);
155 MODULE_PARM_DESC(ring_size
, "Ring buffer size (in bytes)");
157 /* The one and only one */
158 static struct blkvsc_driver_context g_blkvsc_drv
;
160 static const struct block_device_operations block_ops
= {
161 .owner
= THIS_MODULE
,
163 .release
= blkvsc_release
,
164 .media_changed
= blkvsc_media_changed
,
165 .revalidate_disk
= blkvsc_revalidate_disk
,
166 .getgeo
= blkvsc_getgeo
,
167 .ioctl
= blkvsc_ioctl
,
171 * blkvsc_drv_init - BlkVsc driver initialization.
173 static int blkvsc_drv_init(int (*drv_init
)(struct hv_driver
*drv
))
175 struct storvsc_driver_object
*storvsc_drv_obj
= &g_blkvsc_drv
.drv_obj
;
176 struct driver_context
*drv_ctx
= &g_blkvsc_drv
.drv_ctx
;
179 vmbus_get_interface(&storvsc_drv_obj
->Base
.VmbusChannelInterface
);
181 storvsc_drv_obj
->RingBufferSize
= blkvsc_ringbuffer_size
;
183 /* Callback to client driver to complete the initialization */
184 drv_init(&storvsc_drv_obj
->Base
);
186 drv_ctx
->driver
.name
= storvsc_drv_obj
->Base
.name
;
187 memcpy(&drv_ctx
->class_id
, &storvsc_drv_obj
->Base
.deviceType
,
188 sizeof(struct hv_guid
));
190 drv_ctx
->probe
= blkvsc_probe
;
191 drv_ctx
->remove
= blkvsc_remove
;
192 drv_ctx
->shutdown
= blkvsc_shutdown
;
194 /* The driver belongs to vmbus */
195 ret
= vmbus_child_driver_register(drv_ctx
);
200 static int blkvsc_drv_exit_cb(struct device
*dev
, void *data
)
202 struct device
**curr
= (struct device
**)data
;
204 return 1; /* stop iterating */
207 static void blkvsc_drv_exit(void)
209 struct storvsc_driver_object
*storvsc_drv_obj
= &g_blkvsc_drv
.drv_obj
;
210 struct driver_context
*drv_ctx
= &g_blkvsc_drv
.drv_ctx
;
211 struct device
*current_dev
;
218 ret
= driver_for_each_device(&drv_ctx
->driver
, NULL
,
219 (void *) ¤t_dev
,
223 DPRINT_WARN(BLKVSC_DRV
,
224 "driver_for_each_device returned %d", ret
);
227 if (current_dev
== NULL
)
230 /* Initiate removal from the top-down */
231 device_unregister(current_dev
);
234 if (storvsc_drv_obj
->Base
.OnCleanup
)
235 storvsc_drv_obj
->Base
.OnCleanup(&storvsc_drv_obj
->Base
);
237 vmbus_child_driver_unregister(drv_ctx
);
243 * blkvsc_probe - Add a new device for this driver
245 static int blkvsc_probe(struct device
*device
)
247 struct driver_context
*driver_ctx
=
248 driver_to_driver_context(device
->driver
);
249 struct blkvsc_driver_context
*blkvsc_drv_ctx
=
250 (struct blkvsc_driver_context
*)driver_ctx
;
251 struct storvsc_driver_object
*storvsc_drv_obj
=
252 &blkvsc_drv_ctx
->drv_obj
;
253 struct vm_device
*device_ctx
= device_to_vm_device(device
);
254 struct hv_device
*device_obj
= &device_ctx
->device_obj
;
256 struct block_device_context
*blkdev
= NULL
;
257 struct storvsc_device_info device_info
;
261 static int ide0_registered
;
262 static int ide1_registered
;
264 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_probe - enter");
266 if (!storvsc_drv_obj
->Base
.OnDeviceAdd
) {
267 DPRINT_ERR(BLKVSC_DRV
, "OnDeviceAdd() not set");
272 blkdev
= kzalloc(sizeof(struct block_device_context
), GFP_KERNEL
);
278 INIT_LIST_HEAD(&blkdev
->pending_list
);
280 /* Initialize what we can here */
281 spin_lock_init(&blkdev
->lock
);
283 /* ASSERT(sizeof(struct blkvsc_request_group) <= */
284 /* sizeof(struct blkvsc_request)); */
286 blkdev
->request_pool
= kmem_cache_create(dev_name(&device_ctx
->device
),
287 sizeof(struct blkvsc_request
) +
288 storvsc_drv_obj
->RequestExtSize
, 0,
289 SLAB_HWCACHE_ALIGN
, NULL
);
290 if (!blkdev
->request_pool
) {
296 /* Call to the vsc driver to add the device */
297 ret
= storvsc_drv_obj
->Base
.OnDeviceAdd(device_obj
, &device_info
);
299 DPRINT_ERR(BLKVSC_DRV
, "unable to add blkvsc device");
303 blkdev
->device_ctx
= device_ctx
;
304 /* this identified the device 0 or 1 */
305 blkdev
->target
= device_info
.TargetId
;
306 /* this identified the ide ctrl 0 or 1 */
307 blkdev
->path
= device_info
.PathId
;
309 dev_set_drvdata(device
, blkdev
);
311 /* Calculate the major and device num */
312 if (blkdev
->path
== 0) {
314 devnum
= blkdev
->path
+ blkdev
->target
; /* 0 or 1 */
316 if (!ide0_registered
) {
317 ret
= register_blkdev(major
, "ide");
319 DPRINT_ERR(BLKVSC_DRV
,
320 "register_blkdev() failed! ret %d",
327 } else if (blkdev
->path
== 1) {
329 devnum
= blkdev
->path
+ blkdev
->target
+ 1; /* 2 or 3 */
331 if (!ide1_registered
) {
332 ret
= register_blkdev(major
, "ide");
334 DPRINT_ERR(BLKVSC_DRV
,
335 "register_blkdev() failed! ret %d",
343 DPRINT_ERR(BLKVSC_DRV
, "invalid pathid");
348 DPRINT_INFO(BLKVSC_DRV
, "blkvsc registered for major %d!!", major
);
350 blkdev
->gd
= alloc_disk(BLKVSC_MINORS
);
352 DPRINT_ERR(BLKVSC_DRV
, "register_blkdev() failed! ret %d", ret
);
357 blkdev
->gd
->queue
= blk_init_queue(blkvsc_request
, &blkdev
->lock
);
359 blk_queue_max_segment_size(blkdev
->gd
->queue
, PAGE_SIZE
);
360 blk_queue_max_segments(blkdev
->gd
->queue
, MAX_MULTIPAGE_BUFFER_COUNT
);
361 blk_queue_segment_boundary(blkdev
->gd
->queue
, PAGE_SIZE
-1);
362 blk_queue_bounce_limit(blkdev
->gd
->queue
, BLK_BOUNCE_ANY
);
363 blk_queue_dma_alignment(blkdev
->gd
->queue
, 511);
365 blkdev
->gd
->major
= major
;
366 if (devnum
== 1 || devnum
== 3)
367 blkdev
->gd
->first_minor
= BLKVSC_MINORS
;
369 blkdev
->gd
->first_minor
= 0;
370 blkdev
->gd
->fops
= &block_ops
;
371 blkdev
->gd
->private_data
= blkdev
;
372 sprintf(blkdev
->gd
->disk_name
, "hd%c", 'a' + devnum
);
374 blkvsc_do_inquiry(blkdev
);
375 if (blkdev
->device_type
== DVD_TYPE
) {
376 set_disk_ro(blkdev
->gd
, 1);
377 blkdev
->gd
->flags
|= GENHD_FL_REMOVABLE
;
378 blkvsc_do_read_capacity(blkdev
);
380 blkvsc_do_read_capacity16(blkdev
);
383 set_capacity(blkdev
->gd
, blkdev
->capacity
* (blkdev
->sector_size
/512));
384 blk_queue_logical_block_size(blkdev
->gd
->queue
, blkdev
->sector_size
);
386 add_disk(blkdev
->gd
);
388 DPRINT_INFO(BLKVSC_DRV
, "%s added!! capacity %lu sector_size %d",
389 blkdev
->gd
->disk_name
, (unsigned long)blkdev
->capacity
,
390 blkdev
->sector_size
);
395 storvsc_drv_obj
->Base
.OnDeviceRemove(device_obj
);
399 if (blkdev
->request_pool
) {
400 kmem_cache_destroy(blkdev
->request_pool
);
401 blkdev
->request_pool
= NULL
;
410 static void blkvsc_shutdown(struct device
*device
)
412 struct block_device_context
*blkdev
= dev_get_drvdata(device
);
418 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_shutdown - users %d disk %s\n",
419 blkdev
->users
, blkdev
->gd
->disk_name
);
421 spin_lock_irqsave(&blkdev
->lock
, flags
);
423 blkdev
->shutting_down
= 1;
425 blk_stop_queue(blkdev
->gd
->queue
);
427 spin_unlock_irqrestore(&blkdev
->lock
, flags
);
429 while (blkdev
->num_outstanding_reqs
) {
430 DPRINT_INFO(STORVSC
, "waiting for %d requests to complete...",
431 blkdev
->num_outstanding_reqs
);
435 blkvsc_do_flush(blkdev
);
437 spin_lock_irqsave(&blkdev
->lock
, flags
);
439 blkvsc_cancel_pending_reqs(blkdev
);
441 spin_unlock_irqrestore(&blkdev
->lock
, flags
);
444 static int blkvsc_do_flush(struct block_device_context
*blkdev
)
446 struct blkvsc_request
*blkvsc_req
;
448 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_do_flush()\n");
450 if (blkdev
->device_type
!= HARDDISK_TYPE
)
453 blkvsc_req
= kmem_cache_alloc(blkdev
->request_pool
, GFP_KERNEL
);
457 memset(blkvsc_req
, 0, sizeof(struct blkvsc_request
));
458 init_waitqueue_head(&blkvsc_req
->wevent
);
459 blkvsc_req
->dev
= blkdev
;
460 blkvsc_req
->req
= NULL
;
461 blkvsc_req
->write
= 0;
463 blkvsc_req
->request
.DataBuffer
.PfnArray
[0] = 0;
464 blkvsc_req
->request
.DataBuffer
.Offset
= 0;
465 blkvsc_req
->request
.DataBuffer
.Length
= 0;
467 blkvsc_req
->cmnd
[0] = SYNCHRONIZE_CACHE
;
468 blkvsc_req
->cmd_len
= 10;
471 * Set this here since the completion routine may be invoked and
472 * completed before we return
474 blkvsc_req
->cond
= 0;
475 blkvsc_submit_request(blkvsc_req
, blkvsc_cmd_completion
);
477 wait_event_interruptible(blkvsc_req
->wevent
, blkvsc_req
->cond
);
479 kmem_cache_free(blkvsc_req
->dev
->request_pool
, blkvsc_req
);
484 /* Do a scsi INQUIRY cmd here to get the device type (ie disk or dvd) */
485 static int blkvsc_do_inquiry(struct block_device_context
*blkdev
)
487 struct blkvsc_request
*blkvsc_req
;
488 struct page
*page_buf
;
490 unsigned char device_type
;
492 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_do_inquiry()\n");
494 blkvsc_req
= kmem_cache_alloc(blkdev
->request_pool
, GFP_KERNEL
);
498 memset(blkvsc_req
, 0, sizeof(struct blkvsc_request
));
499 page_buf
= alloc_page(GFP_KERNEL
);
501 kmem_cache_free(blkvsc_req
->dev
->request_pool
, blkvsc_req
);
505 init_waitqueue_head(&blkvsc_req
->wevent
);
506 blkvsc_req
->dev
= blkdev
;
507 blkvsc_req
->req
= NULL
;
508 blkvsc_req
->write
= 0;
510 blkvsc_req
->request
.DataBuffer
.PfnArray
[0] = page_to_pfn(page_buf
);
511 blkvsc_req
->request
.DataBuffer
.Offset
= 0;
512 blkvsc_req
->request
.DataBuffer
.Length
= 64;
514 blkvsc_req
->cmnd
[0] = INQUIRY
;
515 blkvsc_req
->cmnd
[1] = 0x1; /* Get product data */
516 blkvsc_req
->cmnd
[2] = 0x83; /* mode page 83 */
517 blkvsc_req
->cmnd
[4] = 64;
518 blkvsc_req
->cmd_len
= 6;
521 * Set this here since the completion routine may be invoked and
522 * completed before we return
524 blkvsc_req
->cond
= 0;
526 blkvsc_submit_request(blkvsc_req
, blkvsc_cmd_completion
);
528 DPRINT_DBG(BLKVSC_DRV
, "waiting %p to complete - cond %d\n",
529 blkvsc_req
, blkvsc_req
->cond
);
531 wait_event_interruptible(blkvsc_req
->wevent
, blkvsc_req
->cond
);
533 buf
= kmap(page_buf
);
535 /* print_hex_dump_bytes("", DUMP_PREFIX_NONE, buf, 64); */
537 device_type
= buf
[0] & 0x1F;
539 if (device_type
== 0x0) {
540 blkdev
->device_type
= HARDDISK_TYPE
;
541 } else if (device_type
== 0x5) {
542 blkdev
->device_type
= DVD_TYPE
;
544 /* TODO: this is currently unsupported device type */
545 blkdev
->device_type
= UNKNOWN_DEV_TYPE
;
548 DPRINT_DBG(BLKVSC_DRV
, "device type %d\n", device_type
);
550 blkdev
->device_id_len
= buf
[7];
551 if (blkdev
->device_id_len
> 64)
552 blkdev
->device_id_len
= 64;
554 memcpy(blkdev
->device_id
, &buf
[8], blkdev
->device_id_len
);
555 /* printk_hex_dump_bytes("", DUMP_PREFIX_NONE, blkdev->device_id,
556 * blkdev->device_id_len); */
560 __free_page(page_buf
);
562 kmem_cache_free(blkvsc_req
->dev
->request_pool
, blkvsc_req
);
567 /* Do a scsi READ_CAPACITY cmd here to get the size of the disk */
568 static int blkvsc_do_read_capacity(struct block_device_context
*blkdev
)
570 struct blkvsc_request
*blkvsc_req
;
571 struct page
*page_buf
;
573 struct scsi_sense_hdr sense_hdr
;
575 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_do_read_capacity()\n");
577 blkdev
->sector_size
= 0;
578 blkdev
->capacity
= 0;
579 blkdev
->media_not_present
= 0; /* assume a disk is present */
581 blkvsc_req
= kmem_cache_alloc(blkdev
->request_pool
, GFP_KERNEL
);
585 memset(blkvsc_req
, 0, sizeof(struct blkvsc_request
));
586 page_buf
= alloc_page(GFP_KERNEL
);
588 kmem_cache_free(blkvsc_req
->dev
->request_pool
, blkvsc_req
);
592 init_waitqueue_head(&blkvsc_req
->wevent
);
593 blkvsc_req
->dev
= blkdev
;
594 blkvsc_req
->req
= NULL
;
595 blkvsc_req
->write
= 0;
597 blkvsc_req
->request
.DataBuffer
.PfnArray
[0] = page_to_pfn(page_buf
);
598 blkvsc_req
->request
.DataBuffer
.Offset
= 0;
599 blkvsc_req
->request
.DataBuffer
.Length
= 8;
601 blkvsc_req
->cmnd
[0] = READ_CAPACITY
;
602 blkvsc_req
->cmd_len
= 16;
605 * Set this here since the completion routine may be invoked
606 * and completed before we return
608 blkvsc_req
->cond
= 0;
610 blkvsc_submit_request(blkvsc_req
, blkvsc_cmd_completion
);
612 DPRINT_DBG(BLKVSC_DRV
, "waiting %p to complete - cond %d\n",
613 blkvsc_req
, blkvsc_req
->cond
);
615 wait_event_interruptible(blkvsc_req
->wevent
, blkvsc_req
->cond
);
618 if (blkvsc_req
->request
.Status
) {
619 scsi_normalize_sense(blkvsc_req
->sense_buffer
,
620 SCSI_SENSE_BUFFERSIZE
, &sense_hdr
);
622 if (sense_hdr
.asc
== 0x3A) {
623 /* Medium not present */
624 blkdev
->media_not_present
= 1;
628 buf
= kmap(page_buf
);
631 blkdev
->capacity
= ((buf
[0] << 24) | (buf
[1] << 16) |
632 (buf
[2] << 8) | buf
[3]) + 1;
633 blkdev
->sector_size
= (buf
[4] << 24) | (buf
[5] << 16) |
634 (buf
[6] << 8) | buf
[7];
638 __free_page(page_buf
);
640 kmem_cache_free(blkvsc_req
->dev
->request_pool
, blkvsc_req
);
645 static int blkvsc_do_read_capacity16(struct block_device_context
*blkdev
)
647 struct blkvsc_request
*blkvsc_req
;
648 struct page
*page_buf
;
650 struct scsi_sense_hdr sense_hdr
;
652 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_do_read_capacity16()\n");
654 blkdev
->sector_size
= 0;
655 blkdev
->capacity
= 0;
656 blkdev
->media_not_present
= 0; /* assume a disk is present */
658 blkvsc_req
= kmem_cache_alloc(blkdev
->request_pool
, GFP_KERNEL
);
662 memset(blkvsc_req
, 0, sizeof(struct blkvsc_request
));
663 page_buf
= alloc_page(GFP_KERNEL
);
665 kmem_cache_free(blkvsc_req
->dev
->request_pool
, blkvsc_req
);
669 init_waitqueue_head(&blkvsc_req
->wevent
);
670 blkvsc_req
->dev
= blkdev
;
671 blkvsc_req
->req
= NULL
;
672 blkvsc_req
->write
= 0;
674 blkvsc_req
->request
.DataBuffer
.PfnArray
[0] = page_to_pfn(page_buf
);
675 blkvsc_req
->request
.DataBuffer
.Offset
= 0;
676 blkvsc_req
->request
.DataBuffer
.Length
= 12;
678 blkvsc_req
->cmnd
[0] = 0x9E; /* READ_CAPACITY16; */
679 blkvsc_req
->cmd_len
= 16;
682 * Set this here since the completion routine may be invoked
683 * and completed before we return
685 blkvsc_req
->cond
= 0;
687 blkvsc_submit_request(blkvsc_req
, blkvsc_cmd_completion
);
689 DPRINT_DBG(BLKVSC_DRV
, "waiting %p to complete - cond %d\n",
690 blkvsc_req
, blkvsc_req
->cond
);
692 wait_event_interruptible(blkvsc_req
->wevent
, blkvsc_req
->cond
);
695 if (blkvsc_req
->request
.Status
) {
696 scsi_normalize_sense(blkvsc_req
->sense_buffer
,
697 SCSI_SENSE_BUFFERSIZE
, &sense_hdr
);
698 if (sense_hdr
.asc
== 0x3A) {
699 /* Medium not present */
700 blkdev
->media_not_present
= 1;
704 buf
= kmap(page_buf
);
707 blkdev
->capacity
= be64_to_cpu(*(unsigned long long *) &buf
[0]) + 1;
708 blkdev
->sector_size
= be32_to_cpu(*(unsigned int *)&buf
[8]);
711 blkdev
->capacity
= ((buf
[0] << 24) | (buf
[1] << 16) |
712 (buf
[2] << 8) | buf
[3]) + 1;
713 blkdev
->sector_size
= (buf
[4] << 24) | (buf
[5] << 16) |
714 (buf
[6] << 8) | buf
[7];
719 __free_page(page_buf
);
721 kmem_cache_free(blkvsc_req
->dev
->request_pool
, blkvsc_req
);
727 * blkvsc_remove() - Callback when our device is removed
729 static int blkvsc_remove(struct device
*device
)
731 struct driver_context
*driver_ctx
=
732 driver_to_driver_context(device
->driver
);
733 struct blkvsc_driver_context
*blkvsc_drv_ctx
=
734 (struct blkvsc_driver_context
*)driver_ctx
;
735 struct storvsc_driver_object
*storvsc_drv_obj
=
736 &blkvsc_drv_ctx
->drv_obj
;
737 struct vm_device
*device_ctx
= device_to_vm_device(device
);
738 struct hv_device
*device_obj
= &device_ctx
->device_obj
;
739 struct block_device_context
*blkdev
= dev_get_drvdata(device
);
743 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_remove()\n");
745 if (!storvsc_drv_obj
->Base
.OnDeviceRemove
)
749 * Call to the vsc driver to let it know that the device is being
752 ret
= storvsc_drv_obj
->Base
.OnDeviceRemove(device_obj
);
755 DPRINT_ERR(BLKVSC_DRV
,
756 "unable to remove blkvsc device (ret %d)", ret
);
759 /* Get to a known state */
760 spin_lock_irqsave(&blkdev
->lock
, flags
);
762 blkdev
->shutting_down
= 1;
764 blk_stop_queue(blkdev
->gd
->queue
);
766 spin_unlock_irqrestore(&blkdev
->lock
, flags
);
768 while (blkdev
->num_outstanding_reqs
) {
769 DPRINT_INFO(STORVSC
, "waiting for %d requests to complete...",
770 blkdev
->num_outstanding_reqs
);
774 blkvsc_do_flush(blkdev
);
776 spin_lock_irqsave(&blkdev
->lock
, flags
);
778 blkvsc_cancel_pending_reqs(blkdev
);
780 spin_unlock_irqrestore(&blkdev
->lock
, flags
);
782 blk_cleanup_queue(blkdev
->gd
->queue
);
784 del_gendisk(blkdev
->gd
);
786 kmem_cache_destroy(blkdev
->request_pool
);
793 static void blkvsc_init_rw(struct blkvsc_request
*blkvsc_req
)
795 /* ASSERT(blkvsc_req->req); */
796 /* ASSERT(blkvsc_req->sector_count <= (MAX_MULTIPAGE_BUFFER_COUNT*8)); */
798 blkvsc_req
->cmd_len
= 16;
800 if (blkvsc_req
->sector_start
> 0xffffffff) {
801 if (rq_data_dir(blkvsc_req
->req
)) {
802 blkvsc_req
->write
= 1;
803 blkvsc_req
->cmnd
[0] = WRITE_16
;
805 blkvsc_req
->write
= 0;
806 blkvsc_req
->cmnd
[0] = READ_16
;
809 blkvsc_req
->cmnd
[1] |=
810 (blkvsc_req
->req
->cmd_flags
& REQ_FUA
) ? 0x8 : 0;
812 *(unsigned long long *)&blkvsc_req
->cmnd
[2] =
813 cpu_to_be64(blkvsc_req
->sector_start
);
814 *(unsigned int *)&blkvsc_req
->cmnd
[10] =
815 cpu_to_be32(blkvsc_req
->sector_count
);
816 } else if ((blkvsc_req
->sector_count
> 0xff) ||
817 (blkvsc_req
->sector_start
> 0x1fffff)) {
818 if (rq_data_dir(blkvsc_req
->req
)) {
819 blkvsc_req
->write
= 1;
820 blkvsc_req
->cmnd
[0] = WRITE_10
;
822 blkvsc_req
->write
= 0;
823 blkvsc_req
->cmnd
[0] = READ_10
;
826 blkvsc_req
->cmnd
[1] |=
827 (blkvsc_req
->req
->cmd_flags
& REQ_FUA
) ? 0x8 : 0;
829 *(unsigned int *)&blkvsc_req
->cmnd
[2] =
830 cpu_to_be32(blkvsc_req
->sector_start
);
831 *(unsigned short *)&blkvsc_req
->cmnd
[7] =
832 cpu_to_be16(blkvsc_req
->sector_count
);
834 if (rq_data_dir(blkvsc_req
->req
)) {
835 blkvsc_req
->write
= 1;
836 blkvsc_req
->cmnd
[0] = WRITE_6
;
838 blkvsc_req
->write
= 0;
839 blkvsc_req
->cmnd
[0] = READ_6
;
842 *(unsigned int *)&blkvsc_req
->cmnd
[1] =
843 cpu_to_be32(blkvsc_req
->sector_start
) >> 8;
844 blkvsc_req
->cmnd
[1] &= 0x1f;
845 blkvsc_req
->cmnd
[4] = (unsigned char)blkvsc_req
->sector_count
;
849 static int blkvsc_submit_request(struct blkvsc_request
*blkvsc_req
,
850 void (*request_completion
)(struct hv_storvsc_request
*))
852 struct block_device_context
*blkdev
= blkvsc_req
->dev
;
853 struct vm_device
*device_ctx
= blkdev
->device_ctx
;
854 struct driver_context
*driver_ctx
=
855 driver_to_driver_context(device_ctx
->device
.driver
);
856 struct blkvsc_driver_context
*blkvsc_drv_ctx
=
857 (struct blkvsc_driver_context
*)driver_ctx
;
858 struct storvsc_driver_object
*storvsc_drv_obj
=
859 &blkvsc_drv_ctx
->drv_obj
;
860 struct hv_storvsc_request
*storvsc_req
;
863 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_submit_request() - "
864 "req %p type %s start_sector %lu count %ld offset %d "
865 "len %d\n", blkvsc_req
,
866 (blkvsc_req
->write
) ? "WRITE" : "READ",
867 (unsigned long) blkvsc_req
->sector_start
,
868 blkvsc_req
->sector_count
,
869 blkvsc_req
->request
.DataBuffer
.Offset
,
870 blkvsc_req
->request
.DataBuffer
.Length
);
872 for (i
= 0; i
< (blkvsc_req
->request
.DataBuffer
.Length
>> 12); i
++) {
873 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_submit_request() - "
874 "req %p pfn[%d] %llx\n",
876 blkvsc_req
->request
.DataBuffer
.PfnArray
[i
]);
880 storvsc_req
= &blkvsc_req
->request
;
881 storvsc_req
->Extension
= (void *)((unsigned long)blkvsc_req
+
882 sizeof(struct blkvsc_request
));
884 storvsc_req
->Type
= blkvsc_req
->write
? WRITE_TYPE
: READ_TYPE
;
886 storvsc_req
->OnIOCompletion
= request_completion
;
887 storvsc_req
->Context
= blkvsc_req
;
889 storvsc_req
->Host
= blkdev
->port
;
890 storvsc_req
->Bus
= blkdev
->path
;
891 storvsc_req
->TargetId
= blkdev
->target
;
892 storvsc_req
->LunId
= 0; /* this is not really used at all */
894 storvsc_req
->CdbLen
= blkvsc_req
->cmd_len
;
895 storvsc_req
->Cdb
= blkvsc_req
->cmnd
;
897 storvsc_req
->SenseBuffer
= blkvsc_req
->sense_buffer
;
898 storvsc_req
->SenseBufferSize
= SCSI_SENSE_BUFFERSIZE
;
900 ret
= storvsc_drv_obj
->OnIORequest(&blkdev
->device_ctx
->device_obj
,
901 &blkvsc_req
->request
);
903 blkdev
->num_outstanding_reqs
++;
909 * We break the request into 1 or more blkvsc_requests and submit
910 * them. If we cant submit them all, we put them on the
911 * pending_list. The blkvsc_request() will work on the pending_list.
913 static int blkvsc_do_request(struct block_device_context
*blkdev
,
916 struct bio
*bio
= NULL
;
917 struct bio_vec
*bvec
= NULL
;
918 struct bio_vec
*prev_bvec
= NULL
;
919 struct blkvsc_request
*blkvsc_req
= NULL
;
920 struct blkvsc_request
*tmp
;
923 sector_t start_sector
;
924 unsigned long num_sectors
= 0;
927 struct blkvsc_request_group
*group
= NULL
;
929 DPRINT_DBG(BLKVSC_DRV
, "blkdev %p req %p sect %lu\n", blkdev
, req
,
930 (unsigned long)blk_rq_pos(req
));
932 /* Create a group to tie req to list of blkvsc_reqs */
933 group
= kmem_cache_alloc(blkdev
->request_pool
, GFP_ATOMIC
);
937 INIT_LIST_HEAD(&group
->blkvsc_req_list
);
938 group
->outstanding
= group
->status
= 0;
940 start_sector
= blk_rq_pos(req
);
942 /* foreach bio in the request */
944 for (bio
= req
->bio
; bio
; bio
= bio
->bi_next
) {
946 * Map this bio into an existing or new storvsc request
948 bio_for_each_segment(bvec
, bio
, seg_idx
) {
949 DPRINT_DBG(BLKVSC_DRV
, "bio_for_each_segment() "
950 "- req %p bio %p bvec %p seg_idx %d "
951 "databuf_idx %d\n", req
, bio
, bvec
,
952 seg_idx
, databuf_idx
);
954 /* Get a new storvsc request */
957 (databuf_idx
>= MAX_MULTIPAGE_BUFFER_COUNT
)
958 /* hole at the begin of page */
959 || (bvec
->bv_offset
!= 0) ||
960 /* hold at the end of page */
962 (prev_bvec
->bv_len
!= PAGE_SIZE
))) {
963 /* submit the prev one */
965 blkvsc_req
->sector_start
= start_sector
;
966 sector_div(blkvsc_req
->sector_start
, (blkdev
->sector_size
>> 9));
968 blkvsc_req
->sector_count
= num_sectors
/ (blkdev
->sector_size
>> 9);
969 blkvsc_init_rw(blkvsc_req
);
973 * Create new blkvsc_req to represent
976 blkvsc_req
= kmem_cache_alloc(blkdev
->request_pool
, GFP_ATOMIC
);
978 /* free up everything */
979 list_for_each_entry_safe(
981 &group
->blkvsc_req_list
,
983 list_del(&blkvsc_req
->req_entry
);
984 kmem_cache_free(blkdev
->request_pool
, blkvsc_req
);
987 kmem_cache_free(blkdev
->request_pool
, group
);
991 memset(blkvsc_req
, 0,
992 sizeof(struct blkvsc_request
));
994 blkvsc_req
->dev
= blkdev
;
995 blkvsc_req
->req
= req
;
996 blkvsc_req
->request
.DataBuffer
.Offset
= bvec
->bv_offset
;
997 blkvsc_req
->request
.DataBuffer
.Length
= 0;
999 /* Add to the group */
1000 blkvsc_req
->group
= group
;
1001 blkvsc_req
->group
->outstanding
++;
1002 list_add_tail(&blkvsc_req
->req_entry
,
1003 &blkvsc_req
->group
->blkvsc_req_list
);
1005 start_sector
+= num_sectors
;
1010 /* Add the curr bvec/segment to the curr blkvsc_req */
1011 blkvsc_req
->request
.DataBuffer
.PfnArray
[databuf_idx
] = page_to_pfn(bvec
->bv_page
);
1012 blkvsc_req
->request
.DataBuffer
.Length
+= bvec
->bv_len
;
1017 num_sectors
+= bvec
->bv_len
>> 9;
1019 } /* bio_for_each_segment */
1021 } /* rq_for_each_bio */
1024 /* Handle the last one */
1026 DPRINT_DBG(BLKVSC_DRV
, "blkdev %p req %p group %p count %d\n",
1027 blkdev
, req
, blkvsc_req
->group
,
1028 blkvsc_req
->group
->outstanding
);
1030 blkvsc_req
->sector_start
= start_sector
;
1031 sector_div(blkvsc_req
->sector_start
,
1032 (blkdev
->sector_size
>> 9));
1034 blkvsc_req
->sector_count
= num_sectors
/
1035 (blkdev
->sector_size
>> 9);
1037 blkvsc_init_rw(blkvsc_req
);
1040 list_for_each_entry(blkvsc_req
, &group
->blkvsc_req_list
, req_entry
) {
1042 DPRINT_DBG(BLKVSC_DRV
, "adding blkvsc_req to "
1043 "pending_list - blkvsc_req %p start_sect %lu"
1044 " sect_count %ld (%lu %ld)\n", blkvsc_req
,
1045 (unsigned long)blkvsc_req
->sector_start
,
1046 blkvsc_req
->sector_count
,
1047 (unsigned long)start_sector
,
1048 (unsigned long)num_sectors
);
1050 list_add_tail(&blkvsc_req
->pend_entry
,
1051 &blkdev
->pending_list
);
1053 ret
= blkvsc_submit_request(blkvsc_req
,
1054 blkvsc_request_completion
);
1057 list_add_tail(&blkvsc_req
->pend_entry
,
1058 &blkdev
->pending_list
);
1061 DPRINT_DBG(BLKVSC_DRV
, "submitted blkvsc_req %p "
1062 "start_sect %lu sect_count %ld (%lu %ld) "
1063 "ret %d\n", blkvsc_req
,
1064 (unsigned long)blkvsc_req
->sector_start
,
1065 blkvsc_req
->sector_count
,
1066 (unsigned long)start_sector
,
1074 static void blkvsc_cmd_completion(struct hv_storvsc_request
*request
)
1076 struct blkvsc_request
*blkvsc_req
=
1077 (struct blkvsc_request
*)request
->Context
;
1078 struct block_device_context
*blkdev
=
1079 (struct block_device_context
*)blkvsc_req
->dev
;
1080 struct scsi_sense_hdr sense_hdr
;
1082 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_cmd_completion() - req %p\n",
1085 blkdev
->num_outstanding_reqs
--;
1087 if (blkvsc_req
->request
.Status
)
1088 if (scsi_normalize_sense(blkvsc_req
->sense_buffer
,
1089 SCSI_SENSE_BUFFERSIZE
, &sense_hdr
))
1090 scsi_print_sense_hdr("blkvsc", &sense_hdr
);
1092 blkvsc_req
->cond
= 1;
1093 wake_up_interruptible(&blkvsc_req
->wevent
);
1096 static void blkvsc_request_completion(struct hv_storvsc_request
*request
)
1098 struct blkvsc_request
*blkvsc_req
=
1099 (struct blkvsc_request
*)request
->Context
;
1100 struct block_device_context
*blkdev
=
1101 (struct block_device_context
*)blkvsc_req
->dev
;
1102 unsigned long flags
;
1103 struct blkvsc_request
*comp_req
, *tmp
;
1105 /* ASSERT(blkvsc_req->group); */
1107 DPRINT_DBG(BLKVSC_DRV
, "blkdev %p blkvsc_req %p group %p type %s "
1108 "sect_start %lu sect_count %ld len %d group outstd %d "
1109 "total outstd %d\n",
1110 blkdev
, blkvsc_req
, blkvsc_req
->group
,
1111 (blkvsc_req
->write
) ? "WRITE" : "READ",
1112 (unsigned long)blkvsc_req
->sector_start
,
1113 blkvsc_req
->sector_count
,
1114 blkvsc_req
->request
.DataBuffer
.Length
,
1115 blkvsc_req
->group
->outstanding
,
1116 blkdev
->num_outstanding_reqs
);
1118 spin_lock_irqsave(&blkdev
->lock
, flags
);
1120 blkdev
->num_outstanding_reqs
--;
1121 blkvsc_req
->group
->outstanding
--;
1124 * Only start processing when all the blkvsc_reqs are
1125 * completed. This guarantees no out-of-order blkvsc_req
1126 * completion when calling end_that_request_first()
1128 if (blkvsc_req
->group
->outstanding
== 0) {
1129 list_for_each_entry_safe(comp_req
, tmp
,
1130 &blkvsc_req
->group
->blkvsc_req_list
,
1132 DPRINT_DBG(BLKVSC_DRV
, "completing blkvsc_req %p "
1133 "sect_start %lu sect_count %ld\n",
1135 (unsigned long)comp_req
->sector_start
,
1136 comp_req
->sector_count
);
1138 list_del(&comp_req
->req_entry
);
1140 if (!__blk_end_request(comp_req
->req
,
1141 (!comp_req
->request
.Status
? 0 : -EIO
),
1142 comp_req
->sector_count
* blkdev
->sector_size
)) {
1144 * All the sectors have been xferred ie the
1147 DPRINT_DBG(BLKVSC_DRV
, "req %p COMPLETED\n",
1149 kmem_cache_free(blkdev
->request_pool
,
1153 kmem_cache_free(blkdev
->request_pool
, comp_req
);
1156 if (!blkdev
->shutting_down
) {
1157 blkvsc_do_pending_reqs(blkdev
);
1158 blk_start_queue(blkdev
->gd
->queue
);
1159 blkvsc_request(blkdev
->gd
->queue
);
1163 spin_unlock_irqrestore(&blkdev
->lock
, flags
);
1166 static int blkvsc_cancel_pending_reqs(struct block_device_context
*blkdev
)
1168 struct blkvsc_request
*pend_req
, *tmp
;
1169 struct blkvsc_request
*comp_req
, *tmp2
;
1173 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_cancel_pending_reqs()");
1175 /* Flush the pending list first */
1176 list_for_each_entry_safe(pend_req
, tmp
, &blkdev
->pending_list
,
1179 * The pend_req could be part of a partially completed
1180 * request. If so, complete those req first until we
1183 list_for_each_entry_safe(comp_req
, tmp2
,
1184 &pend_req
->group
->blkvsc_req_list
,
1186 DPRINT_DBG(BLKVSC_DRV
, "completing blkvsc_req %p "
1187 "sect_start %lu sect_count %ld\n",
1189 (unsigned long) comp_req
->sector_start
,
1190 comp_req
->sector_count
);
1192 if (comp_req
== pend_req
)
1195 list_del(&comp_req
->req_entry
);
1197 if (comp_req
->req
) {
1198 ret
= __blk_end_request(comp_req
->req
,
1199 (!comp_req
->request
.Status
? 0 : -EIO
),
1200 comp_req
->sector_count
*
1201 blkdev
->sector_size
);
1203 /* FIXME: shouldn't this do more than return? */
1208 kmem_cache_free(blkdev
->request_pool
, comp_req
);
1211 DPRINT_DBG(BLKVSC_DRV
, "cancelling pending request - %p\n",
1214 list_del(&pend_req
->pend_entry
);
1216 list_del(&pend_req
->req_entry
);
1218 if (comp_req
->req
) {
1219 if (!__blk_end_request(pend_req
->req
, -EIO
,
1220 pend_req
->sector_count
*
1221 blkdev
->sector_size
)) {
1223 * All the sectors have been xferred ie the
1226 DPRINT_DBG(BLKVSC_DRV
,
1227 "blkvsc_cancel_pending_reqs() - "
1228 "req %p COMPLETED\n", pend_req
->req
);
1229 kmem_cache_free(blkdev
->request_pool
,
1234 kmem_cache_free(blkdev
->request_pool
, pend_req
);
1241 static int blkvsc_do_pending_reqs(struct block_device_context
*blkdev
)
1243 struct blkvsc_request
*pend_req
, *tmp
;
1246 /* Flush the pending list first */
1247 list_for_each_entry_safe(pend_req
, tmp
, &blkdev
->pending_list
,
1249 DPRINT_DBG(BLKVSC_DRV
, "working off pending_list - %p\n",
1252 ret
= blkvsc_submit_request(pend_req
,
1253 blkvsc_request_completion
);
1257 list_del(&pend_req
->pend_entry
);
1263 static void blkvsc_request(struct request_queue
*queue
)
1265 struct block_device_context
*blkdev
= NULL
;
1266 struct request
*req
;
1269 DPRINT_DBG(BLKVSC_DRV
, "- enter\n");
1270 while ((req
= blk_peek_request(queue
)) != NULL
) {
1271 DPRINT_DBG(BLKVSC_DRV
, "- req %p\n", req
);
1273 blkdev
= req
->rq_disk
->private_data
;
1274 if (blkdev
->shutting_down
|| req
->cmd_type
!= REQ_TYPE_FS
||
1275 blkdev
->media_not_present
) {
1276 __blk_end_request_cur(req
, 0);
1280 ret
= blkvsc_do_pending_reqs(blkdev
);
1283 DPRINT_DBG(BLKVSC_DRV
,
1284 "- stop queue - pending_list not empty\n");
1285 blk_stop_queue(queue
);
1289 blk_start_request(req
);
1291 ret
= blkvsc_do_request(blkdev
, req
);
1293 DPRINT_DBG(BLKVSC_DRV
, "- stop queue - no room\n");
1294 blk_stop_queue(queue
);
1296 } else if (ret
< 0) {
1297 DPRINT_DBG(BLKVSC_DRV
, "- stop queue - no mem\n");
1298 blk_requeue_request(queue
, req
);
1299 blk_stop_queue(queue
);
1305 static int blkvsc_open(struct block_device
*bdev
, fmode_t mode
)
1307 struct block_device_context
*blkdev
= bdev
->bd_disk
->private_data
;
1309 DPRINT_DBG(BLKVSC_DRV
, "- users %d disk %s\n", blkdev
->users
,
1310 blkdev
->gd
->disk_name
);
1313 spin_lock(&blkdev
->lock
);
1315 if (!blkdev
->users
&& blkdev
->device_type
== DVD_TYPE
) {
1316 spin_unlock(&blkdev
->lock
);
1317 check_disk_change(bdev
);
1318 spin_lock(&blkdev
->lock
);
1323 spin_unlock(&blkdev
->lock
);
1328 static int blkvsc_release(struct gendisk
*disk
, fmode_t mode
)
1330 struct block_device_context
*blkdev
= disk
->private_data
;
1332 DPRINT_DBG(BLKVSC_DRV
, "- users %d disk %s\n", blkdev
->users
,
1333 blkdev
->gd
->disk_name
);
1336 spin_lock(&blkdev
->lock
);
1337 if (blkdev
->users
== 1) {
1338 spin_unlock(&blkdev
->lock
);
1339 blkvsc_do_flush(blkdev
);
1340 spin_lock(&blkdev
->lock
);
1345 spin_unlock(&blkdev
->lock
);
1350 static int blkvsc_media_changed(struct gendisk
*gd
)
1352 DPRINT_DBG(BLKVSC_DRV
, "- enter\n");
1356 static int blkvsc_revalidate_disk(struct gendisk
*gd
)
1358 struct block_device_context
*blkdev
= gd
->private_data
;
1360 DPRINT_DBG(BLKVSC_DRV
, "- enter\n");
1362 if (blkdev
->device_type
== DVD_TYPE
) {
1363 blkvsc_do_read_capacity(blkdev
);
1364 set_capacity(blkdev
->gd
, blkdev
->capacity
*
1365 (blkdev
->sector_size
/512));
1366 blk_queue_logical_block_size(gd
->queue
, blkdev
->sector_size
);
1371 static int blkvsc_getgeo(struct block_device
*bd
, struct hd_geometry
*hg
)
1373 sector_t total_sectors
= get_capacity(bd
->bd_disk
);
1374 sector_t cylinder_times_heads
= 0;
1377 int sectors_per_track
= 0;
1382 if (total_sectors
> (65535 * 16 * 255))
1383 total_sectors
= (65535 * 16 * 255);
1385 if (total_sectors
>= (65535 * 16 * 63)) {
1386 sectors_per_track
= 255;
1389 cylinder_times_heads
= total_sectors
;
1390 /* sector_div stores the quotient in cylinder_times_heads */
1391 rem
= sector_div(cylinder_times_heads
, sectors_per_track
);
1393 sectors_per_track
= 17;
1395 cylinder_times_heads
= total_sectors
;
1396 /* sector_div stores the quotient in cylinder_times_heads */
1397 rem
= sector_div(cylinder_times_heads
, sectors_per_track
);
1399 temp
= cylinder_times_heads
+ 1023;
1400 /* sector_div stores the quotient in temp */
1401 rem
= sector_div(temp
, 1024);
1409 if (cylinder_times_heads
>= (heads
* 1024) || (heads
> 16)) {
1410 sectors_per_track
= 31;
1413 cylinder_times_heads
= total_sectors
;
1415 * sector_div stores the quotient in
1416 * cylinder_times_heads
1418 rem
= sector_div(cylinder_times_heads
,
1422 if (cylinder_times_heads
>= (heads
* 1024)) {
1423 sectors_per_track
= 63;
1426 cylinder_times_heads
= total_sectors
;
1428 * sector_div stores the quotient in
1429 * cylinder_times_heads
1431 rem
= sector_div(cylinder_times_heads
,
1436 temp
= cylinder_times_heads
;
1437 /* sector_div stores the quotient in temp */
1438 rem
= sector_div(temp
, heads
);
1442 hg
->sectors
= sectors_per_track
;
1443 hg
->cylinders
= cylinders
;
1445 DPRINT_INFO(BLKVSC_DRV
, "CHS (%d, %d, %d)", cylinders
, heads
,
1451 static int blkvsc_ioctl(struct block_device
*bd
, fmode_t mode
,
1452 unsigned cmd
, unsigned long argument
)
1454 /* struct block_device_context *blkdev = bd->bd_disk->private_data; */
1459 * TODO: I think there is certain format for HDIO_GET_IDENTITY rather
1460 * than just a GUID. Commented it out for now.
1463 case HDIO_GET_IDENTITY
:
1464 DPRINT_INFO(BLKVSC_DRV
, "HDIO_GET_IDENTITY\n");
1465 if (copy_to_user((void __user
*)arg
, blkdev
->device_id
,
1466 blkdev
->device_id_len
))
1478 static int __init
blkvsc_init(void)
1482 BUILD_BUG_ON(sizeof(sector_t
) != 8);
1484 DPRINT_INFO(BLKVSC_DRV
, "Blkvsc initializing....");
1486 ret
= blkvsc_drv_init(BlkVscInitialize
);
1491 static void __exit
blkvsc_exit(void)
1496 MODULE_LICENSE("GPL");
1497 MODULE_VERSION(HV_DRV_VERSION
);
1498 MODULE_DESCRIPTION("Microsoft Hyper-V virtual block driver");
1499 module_init(blkvsc_init
);
1500 module_exit(blkvsc_exit
);