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/mutex.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 DEFINE_MUTEX(blkvsc_mutex
);
128 static int blkvsc_probe(struct device
*dev
);
129 static int blkvsc_remove(struct device
*device
);
130 static void blkvsc_shutdown(struct device
*device
);
132 static int blkvsc_open(struct block_device
*bdev
, fmode_t mode
);
133 static int blkvsc_release(struct gendisk
*disk
, fmode_t mode
);
134 static int blkvsc_media_changed(struct gendisk
*gd
);
135 static int blkvsc_revalidate_disk(struct gendisk
*gd
);
136 static int blkvsc_getgeo(struct block_device
*bd
, struct hd_geometry
*hg
);
137 static int blkvsc_ioctl(struct block_device
*bd
, fmode_t mode
,
138 unsigned cmd
, unsigned long argument
);
139 static void blkvsc_request(struct request_queue
*queue
);
140 static void blkvsc_request_completion(struct hv_storvsc_request
*request
);
141 static int blkvsc_do_request(struct block_device_context
*blkdev
,
142 struct request
*req
);
143 static int blkvsc_submit_request(struct blkvsc_request
*blkvsc_req
,
144 void (*request_completion
)(struct hv_storvsc_request
*));
145 static void blkvsc_init_rw(struct blkvsc_request
*blkvsc_req
);
146 static void blkvsc_cmd_completion(struct hv_storvsc_request
*request
);
147 static int blkvsc_do_inquiry(struct block_device_context
*blkdev
);
148 static int blkvsc_do_read_capacity(struct block_device_context
*blkdev
);
149 static int blkvsc_do_read_capacity16(struct block_device_context
*blkdev
);
150 static int blkvsc_do_flush(struct block_device_context
*blkdev
);
151 static int blkvsc_cancel_pending_reqs(struct block_device_context
*blkdev
);
152 static int blkvsc_do_pending_reqs(struct block_device_context
*blkdev
);
154 static int blkvsc_ringbuffer_size
= BLKVSC_RING_BUFFER_SIZE
;
155 module_param(blkvsc_ringbuffer_size
, int, S_IRUGO
);
156 MODULE_PARM_DESC(ring_size
, "Ring buffer size (in bytes)");
158 /* The one and only one */
159 static struct blkvsc_driver_context g_blkvsc_drv
;
161 static const struct block_device_operations block_ops
= {
162 .owner
= THIS_MODULE
,
164 .release
= blkvsc_release
,
165 .media_changed
= blkvsc_media_changed
,
166 .revalidate_disk
= blkvsc_revalidate_disk
,
167 .getgeo
= blkvsc_getgeo
,
168 .ioctl
= blkvsc_ioctl
,
172 * blkvsc_drv_init - BlkVsc driver initialization.
174 static int blkvsc_drv_init(int (*drv_init
)(struct hv_driver
*drv
))
176 struct storvsc_driver_object
*storvsc_drv_obj
= &g_blkvsc_drv
.drv_obj
;
177 struct driver_context
*drv_ctx
= &g_blkvsc_drv
.drv_ctx
;
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] |=
809 (blkvsc_req
->req
->cmd_flags
& REQ_FUA
) ? 0x8 : 0;
811 *(unsigned long long *)&blkvsc_req
->cmnd
[2] =
812 cpu_to_be64(blkvsc_req
->sector_start
);
813 *(unsigned int *)&blkvsc_req
->cmnd
[10] =
814 cpu_to_be32(blkvsc_req
->sector_count
);
815 } else if ((blkvsc_req
->sector_count
> 0xff) ||
816 (blkvsc_req
->sector_start
> 0x1fffff)) {
817 if (rq_data_dir(blkvsc_req
->req
)) {
818 blkvsc_req
->write
= 1;
819 blkvsc_req
->cmnd
[0] = WRITE_10
;
821 blkvsc_req
->write
= 0;
822 blkvsc_req
->cmnd
[0] = READ_10
;
825 blkvsc_req
->cmnd
[1] |=
826 (blkvsc_req
->req
->cmd_flags
& REQ_FUA
) ? 0x8 : 0;
828 *(unsigned int *)&blkvsc_req
->cmnd
[2] =
829 cpu_to_be32(blkvsc_req
->sector_start
);
830 *(unsigned short *)&blkvsc_req
->cmnd
[7] =
831 cpu_to_be16(blkvsc_req
->sector_count
);
833 if (rq_data_dir(blkvsc_req
->req
)) {
834 blkvsc_req
->write
= 1;
835 blkvsc_req
->cmnd
[0] = WRITE_6
;
837 blkvsc_req
->write
= 0;
838 blkvsc_req
->cmnd
[0] = READ_6
;
841 *(unsigned int *)&blkvsc_req
->cmnd
[1] =
842 cpu_to_be32(blkvsc_req
->sector_start
) >> 8;
843 blkvsc_req
->cmnd
[1] &= 0x1f;
844 blkvsc_req
->cmnd
[4] = (unsigned char)blkvsc_req
->sector_count
;
848 static int blkvsc_submit_request(struct blkvsc_request
*blkvsc_req
,
849 void (*request_completion
)(struct hv_storvsc_request
*))
851 struct block_device_context
*blkdev
= blkvsc_req
->dev
;
852 struct vm_device
*device_ctx
= blkdev
->device_ctx
;
853 struct driver_context
*driver_ctx
=
854 driver_to_driver_context(device_ctx
->device
.driver
);
855 struct blkvsc_driver_context
*blkvsc_drv_ctx
=
856 (struct blkvsc_driver_context
*)driver_ctx
;
857 struct storvsc_driver_object
*storvsc_drv_obj
=
858 &blkvsc_drv_ctx
->drv_obj
;
859 struct hv_storvsc_request
*storvsc_req
;
862 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_submit_request() - "
863 "req %p type %s start_sector %lu count %ld offset %d "
864 "len %d\n", blkvsc_req
,
865 (blkvsc_req
->write
) ? "WRITE" : "READ",
866 (unsigned long) blkvsc_req
->sector_start
,
867 blkvsc_req
->sector_count
,
868 blkvsc_req
->request
.DataBuffer
.Offset
,
869 blkvsc_req
->request
.DataBuffer
.Length
);
871 for (i
= 0; i
< (blkvsc_req
->request
.DataBuffer
.Length
>> 12); i
++) {
872 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_submit_request() - "
873 "req %p pfn[%d] %llx\n",
875 blkvsc_req
->request
.DataBuffer
.PfnArray
[i
]);
879 storvsc_req
= &blkvsc_req
->request
;
880 storvsc_req
->Extension
= (void *)((unsigned long)blkvsc_req
+
881 sizeof(struct blkvsc_request
));
883 storvsc_req
->Type
= blkvsc_req
->write
? WRITE_TYPE
: READ_TYPE
;
885 storvsc_req
->OnIOCompletion
= request_completion
;
886 storvsc_req
->Context
= blkvsc_req
;
888 storvsc_req
->Host
= blkdev
->port
;
889 storvsc_req
->Bus
= blkdev
->path
;
890 storvsc_req
->TargetId
= blkdev
->target
;
891 storvsc_req
->LunId
= 0; /* this is not really used at all */
893 storvsc_req
->CdbLen
= blkvsc_req
->cmd_len
;
894 storvsc_req
->Cdb
= blkvsc_req
->cmnd
;
896 storvsc_req
->SenseBuffer
= blkvsc_req
->sense_buffer
;
897 storvsc_req
->SenseBufferSize
= SCSI_SENSE_BUFFERSIZE
;
899 ret
= storvsc_drv_obj
->OnIORequest(&blkdev
->device_ctx
->device_obj
,
900 &blkvsc_req
->request
);
902 blkdev
->num_outstanding_reqs
++;
908 * We break the request into 1 or more blkvsc_requests and submit
909 * them. If we cant submit them all, we put them on the
910 * pending_list. The blkvsc_request() will work on the pending_list.
912 static int blkvsc_do_request(struct block_device_context
*blkdev
,
915 struct bio
*bio
= NULL
;
916 struct bio_vec
*bvec
= NULL
;
917 struct bio_vec
*prev_bvec
= NULL
;
918 struct blkvsc_request
*blkvsc_req
= NULL
;
919 struct blkvsc_request
*tmp
;
922 sector_t start_sector
;
923 unsigned long num_sectors
= 0;
926 struct blkvsc_request_group
*group
= NULL
;
928 DPRINT_DBG(BLKVSC_DRV
, "blkdev %p req %p sect %lu\n", blkdev
, req
,
929 (unsigned long)blk_rq_pos(req
));
931 /* Create a group to tie req to list of blkvsc_reqs */
932 group
= kmem_cache_alloc(blkdev
->request_pool
, GFP_ATOMIC
);
936 INIT_LIST_HEAD(&group
->blkvsc_req_list
);
937 group
->outstanding
= group
->status
= 0;
939 start_sector
= blk_rq_pos(req
);
941 /* foreach bio in the request */
943 for (bio
= req
->bio
; bio
; bio
= bio
->bi_next
) {
945 * Map this bio into an existing or new storvsc request
947 bio_for_each_segment(bvec
, bio
, seg_idx
) {
948 DPRINT_DBG(BLKVSC_DRV
, "bio_for_each_segment() "
949 "- req %p bio %p bvec %p seg_idx %d "
950 "databuf_idx %d\n", req
, bio
, bvec
,
951 seg_idx
, databuf_idx
);
953 /* Get a new storvsc request */
956 (databuf_idx
>= MAX_MULTIPAGE_BUFFER_COUNT
)
957 /* hole at the begin of page */
958 || (bvec
->bv_offset
!= 0) ||
959 /* hold at the end of page */
961 (prev_bvec
->bv_len
!= PAGE_SIZE
))) {
962 /* submit the prev one */
964 blkvsc_req
->sector_start
= start_sector
;
965 sector_div(blkvsc_req
->sector_start
, (blkdev
->sector_size
>> 9));
967 blkvsc_req
->sector_count
= num_sectors
/ (blkdev
->sector_size
>> 9);
968 blkvsc_init_rw(blkvsc_req
);
972 * Create new blkvsc_req to represent
975 blkvsc_req
= kmem_cache_alloc(blkdev
->request_pool
, GFP_ATOMIC
);
977 /* free up everything */
978 list_for_each_entry_safe(
980 &group
->blkvsc_req_list
,
982 list_del(&blkvsc_req
->req_entry
);
983 kmem_cache_free(blkdev
->request_pool
, blkvsc_req
);
986 kmem_cache_free(blkdev
->request_pool
, group
);
990 memset(blkvsc_req
, 0,
991 sizeof(struct blkvsc_request
));
993 blkvsc_req
->dev
= blkdev
;
994 blkvsc_req
->req
= req
;
995 blkvsc_req
->request
.DataBuffer
.Offset
= bvec
->bv_offset
;
996 blkvsc_req
->request
.DataBuffer
.Length
= 0;
998 /* Add to the group */
999 blkvsc_req
->group
= group
;
1000 blkvsc_req
->group
->outstanding
++;
1001 list_add_tail(&blkvsc_req
->req_entry
,
1002 &blkvsc_req
->group
->blkvsc_req_list
);
1004 start_sector
+= num_sectors
;
1009 /* Add the curr bvec/segment to the curr blkvsc_req */
1010 blkvsc_req
->request
.DataBuffer
.PfnArray
[databuf_idx
] = page_to_pfn(bvec
->bv_page
);
1011 blkvsc_req
->request
.DataBuffer
.Length
+= bvec
->bv_len
;
1016 num_sectors
+= bvec
->bv_len
>> 9;
1018 } /* bio_for_each_segment */
1020 } /* rq_for_each_bio */
1023 /* Handle the last one */
1025 DPRINT_DBG(BLKVSC_DRV
, "blkdev %p req %p group %p count %d\n",
1026 blkdev
, req
, blkvsc_req
->group
,
1027 blkvsc_req
->group
->outstanding
);
1029 blkvsc_req
->sector_start
= start_sector
;
1030 sector_div(blkvsc_req
->sector_start
,
1031 (blkdev
->sector_size
>> 9));
1033 blkvsc_req
->sector_count
= num_sectors
/
1034 (blkdev
->sector_size
>> 9);
1036 blkvsc_init_rw(blkvsc_req
);
1039 list_for_each_entry(blkvsc_req
, &group
->blkvsc_req_list
, req_entry
) {
1041 DPRINT_DBG(BLKVSC_DRV
, "adding blkvsc_req to "
1042 "pending_list - blkvsc_req %p start_sect %lu"
1043 " sect_count %ld (%lu %ld)\n", blkvsc_req
,
1044 (unsigned long)blkvsc_req
->sector_start
,
1045 blkvsc_req
->sector_count
,
1046 (unsigned long)start_sector
,
1047 (unsigned long)num_sectors
);
1049 list_add_tail(&blkvsc_req
->pend_entry
,
1050 &blkdev
->pending_list
);
1052 ret
= blkvsc_submit_request(blkvsc_req
,
1053 blkvsc_request_completion
);
1056 list_add_tail(&blkvsc_req
->pend_entry
,
1057 &blkdev
->pending_list
);
1060 DPRINT_DBG(BLKVSC_DRV
, "submitted blkvsc_req %p "
1061 "start_sect %lu sect_count %ld (%lu %ld) "
1062 "ret %d\n", blkvsc_req
,
1063 (unsigned long)blkvsc_req
->sector_start
,
1064 blkvsc_req
->sector_count
,
1065 (unsigned long)start_sector
,
1073 static void blkvsc_cmd_completion(struct hv_storvsc_request
*request
)
1075 struct blkvsc_request
*blkvsc_req
=
1076 (struct blkvsc_request
*)request
->Context
;
1077 struct block_device_context
*blkdev
=
1078 (struct block_device_context
*)blkvsc_req
->dev
;
1079 struct scsi_sense_hdr sense_hdr
;
1081 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_cmd_completion() - req %p\n",
1084 blkdev
->num_outstanding_reqs
--;
1086 if (blkvsc_req
->request
.Status
)
1087 if (scsi_normalize_sense(blkvsc_req
->sense_buffer
,
1088 SCSI_SENSE_BUFFERSIZE
, &sense_hdr
))
1089 scsi_print_sense_hdr("blkvsc", &sense_hdr
);
1091 blkvsc_req
->cond
= 1;
1092 wake_up_interruptible(&blkvsc_req
->wevent
);
1095 static void blkvsc_request_completion(struct hv_storvsc_request
*request
)
1097 struct blkvsc_request
*blkvsc_req
=
1098 (struct blkvsc_request
*)request
->Context
;
1099 struct block_device_context
*blkdev
=
1100 (struct block_device_context
*)blkvsc_req
->dev
;
1101 unsigned long flags
;
1102 struct blkvsc_request
*comp_req
, *tmp
;
1104 /* ASSERT(blkvsc_req->group); */
1106 DPRINT_DBG(BLKVSC_DRV
, "blkdev %p blkvsc_req %p group %p type %s "
1107 "sect_start %lu sect_count %ld len %d group outstd %d "
1108 "total outstd %d\n",
1109 blkdev
, blkvsc_req
, blkvsc_req
->group
,
1110 (blkvsc_req
->write
) ? "WRITE" : "READ",
1111 (unsigned long)blkvsc_req
->sector_start
,
1112 blkvsc_req
->sector_count
,
1113 blkvsc_req
->request
.DataBuffer
.Length
,
1114 blkvsc_req
->group
->outstanding
,
1115 blkdev
->num_outstanding_reqs
);
1117 spin_lock_irqsave(&blkdev
->lock
, flags
);
1119 blkdev
->num_outstanding_reqs
--;
1120 blkvsc_req
->group
->outstanding
--;
1123 * Only start processing when all the blkvsc_reqs are
1124 * completed. This guarantees no out-of-order blkvsc_req
1125 * completion when calling end_that_request_first()
1127 if (blkvsc_req
->group
->outstanding
== 0) {
1128 list_for_each_entry_safe(comp_req
, tmp
,
1129 &blkvsc_req
->group
->blkvsc_req_list
,
1131 DPRINT_DBG(BLKVSC_DRV
, "completing blkvsc_req %p "
1132 "sect_start %lu sect_count %ld\n",
1134 (unsigned long)comp_req
->sector_start
,
1135 comp_req
->sector_count
);
1137 list_del(&comp_req
->req_entry
);
1139 if (!__blk_end_request(comp_req
->req
,
1140 (!comp_req
->request
.Status
? 0 : -EIO
),
1141 comp_req
->sector_count
* blkdev
->sector_size
)) {
1143 * All the sectors have been xferred ie the
1146 DPRINT_DBG(BLKVSC_DRV
, "req %p COMPLETED\n",
1148 kmem_cache_free(blkdev
->request_pool
,
1152 kmem_cache_free(blkdev
->request_pool
, comp_req
);
1155 if (!blkdev
->shutting_down
) {
1156 blkvsc_do_pending_reqs(blkdev
);
1157 blk_start_queue(blkdev
->gd
->queue
);
1158 blkvsc_request(blkdev
->gd
->queue
);
1162 spin_unlock_irqrestore(&blkdev
->lock
, flags
);
1165 static int blkvsc_cancel_pending_reqs(struct block_device_context
*blkdev
)
1167 struct blkvsc_request
*pend_req
, *tmp
;
1168 struct blkvsc_request
*comp_req
, *tmp2
;
1172 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_cancel_pending_reqs()");
1174 /* Flush the pending list first */
1175 list_for_each_entry_safe(pend_req
, tmp
, &blkdev
->pending_list
,
1178 * The pend_req could be part of a partially completed
1179 * request. If so, complete those req first until we
1182 list_for_each_entry_safe(comp_req
, tmp2
,
1183 &pend_req
->group
->blkvsc_req_list
,
1185 DPRINT_DBG(BLKVSC_DRV
, "completing blkvsc_req %p "
1186 "sect_start %lu sect_count %ld\n",
1188 (unsigned long) comp_req
->sector_start
,
1189 comp_req
->sector_count
);
1191 if (comp_req
== pend_req
)
1194 list_del(&comp_req
->req_entry
);
1196 if (comp_req
->req
) {
1197 ret
= __blk_end_request(comp_req
->req
,
1198 (!comp_req
->request
.Status
? 0 : -EIO
),
1199 comp_req
->sector_count
*
1200 blkdev
->sector_size
);
1202 /* FIXME: shouldn't this do more than return? */
1207 kmem_cache_free(blkdev
->request_pool
, comp_req
);
1210 DPRINT_DBG(BLKVSC_DRV
, "cancelling pending request - %p\n",
1213 list_del(&pend_req
->pend_entry
);
1215 list_del(&pend_req
->req_entry
);
1217 if (comp_req
->req
) {
1218 if (!__blk_end_request(pend_req
->req
, -EIO
,
1219 pend_req
->sector_count
*
1220 blkdev
->sector_size
)) {
1222 * All the sectors have been xferred ie the
1225 DPRINT_DBG(BLKVSC_DRV
,
1226 "blkvsc_cancel_pending_reqs() - "
1227 "req %p COMPLETED\n", pend_req
->req
);
1228 kmem_cache_free(blkdev
->request_pool
,
1233 kmem_cache_free(blkdev
->request_pool
, pend_req
);
1240 static int blkvsc_do_pending_reqs(struct block_device_context
*blkdev
)
1242 struct blkvsc_request
*pend_req
, *tmp
;
1245 /* Flush the pending list first */
1246 list_for_each_entry_safe(pend_req
, tmp
, &blkdev
->pending_list
,
1248 DPRINT_DBG(BLKVSC_DRV
, "working off pending_list - %p\n",
1251 ret
= blkvsc_submit_request(pend_req
,
1252 blkvsc_request_completion
);
1256 list_del(&pend_req
->pend_entry
);
1262 static void blkvsc_request(struct request_queue
*queue
)
1264 struct block_device_context
*blkdev
= NULL
;
1265 struct request
*req
;
1268 DPRINT_DBG(BLKVSC_DRV
, "- enter\n");
1269 while ((req
= blk_peek_request(queue
)) != NULL
) {
1270 DPRINT_DBG(BLKVSC_DRV
, "- req %p\n", req
);
1272 blkdev
= req
->rq_disk
->private_data
;
1273 if (blkdev
->shutting_down
|| req
->cmd_type
!= REQ_TYPE_FS
||
1274 blkdev
->media_not_present
) {
1275 __blk_end_request_cur(req
, 0);
1279 ret
= blkvsc_do_pending_reqs(blkdev
);
1282 DPRINT_DBG(BLKVSC_DRV
,
1283 "- stop queue - pending_list not empty\n");
1284 blk_stop_queue(queue
);
1288 blk_start_request(req
);
1290 ret
= blkvsc_do_request(blkdev
, req
);
1292 DPRINT_DBG(BLKVSC_DRV
, "- stop queue - no room\n");
1293 blk_stop_queue(queue
);
1295 } else if (ret
< 0) {
1296 DPRINT_DBG(BLKVSC_DRV
, "- stop queue - no mem\n");
1297 blk_requeue_request(queue
, req
);
1298 blk_stop_queue(queue
);
1304 static int blkvsc_open(struct block_device
*bdev
, fmode_t mode
)
1306 struct block_device_context
*blkdev
= bdev
->bd_disk
->private_data
;
1308 DPRINT_DBG(BLKVSC_DRV
, "- users %d disk %s\n", blkdev
->users
,
1309 blkdev
->gd
->disk_name
);
1311 mutex_lock(&blkvsc_mutex
);
1312 spin_lock(&blkdev
->lock
);
1314 if (!blkdev
->users
&& blkdev
->device_type
== DVD_TYPE
) {
1315 spin_unlock(&blkdev
->lock
);
1316 check_disk_change(bdev
);
1317 spin_lock(&blkdev
->lock
);
1322 spin_unlock(&blkdev
->lock
);
1323 mutex_unlock(&blkvsc_mutex
);
1327 static int blkvsc_release(struct gendisk
*disk
, fmode_t mode
)
1329 struct block_device_context
*blkdev
= disk
->private_data
;
1331 DPRINT_DBG(BLKVSC_DRV
, "- users %d disk %s\n", blkdev
->users
,
1332 blkdev
->gd
->disk_name
);
1334 mutex_lock(&blkvsc_mutex
);
1335 spin_lock(&blkdev
->lock
);
1336 if (blkdev
->users
== 1) {
1337 spin_unlock(&blkdev
->lock
);
1338 blkvsc_do_flush(blkdev
);
1339 spin_lock(&blkdev
->lock
);
1344 spin_unlock(&blkdev
->lock
);
1345 mutex_unlock(&blkvsc_mutex
);
1349 static int blkvsc_media_changed(struct gendisk
*gd
)
1351 DPRINT_DBG(BLKVSC_DRV
, "- enter\n");
1355 static int blkvsc_revalidate_disk(struct gendisk
*gd
)
1357 struct block_device_context
*blkdev
= gd
->private_data
;
1359 DPRINT_DBG(BLKVSC_DRV
, "- enter\n");
1361 if (blkdev
->device_type
== DVD_TYPE
) {
1362 blkvsc_do_read_capacity(blkdev
);
1363 set_capacity(blkdev
->gd
, blkdev
->capacity
*
1364 (blkdev
->sector_size
/512));
1365 blk_queue_logical_block_size(gd
->queue
, blkdev
->sector_size
);
1370 static int blkvsc_getgeo(struct block_device
*bd
, struct hd_geometry
*hg
)
1372 sector_t total_sectors
= get_capacity(bd
->bd_disk
);
1373 sector_t cylinder_times_heads
= 0;
1376 int sectors_per_track
= 0;
1381 if (total_sectors
> (65535 * 16 * 255))
1382 total_sectors
= (65535 * 16 * 255);
1384 if (total_sectors
>= (65535 * 16 * 63)) {
1385 sectors_per_track
= 255;
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 sectors_per_track
= 17;
1394 cylinder_times_heads
= total_sectors
;
1395 /* sector_div stores the quotient in cylinder_times_heads */
1396 rem
= sector_div(cylinder_times_heads
, sectors_per_track
);
1398 temp
= cylinder_times_heads
+ 1023;
1399 /* sector_div stores the quotient in temp */
1400 rem
= sector_div(temp
, 1024);
1408 if (cylinder_times_heads
>= (heads
* 1024) || (heads
> 16)) {
1409 sectors_per_track
= 31;
1412 cylinder_times_heads
= total_sectors
;
1414 * sector_div stores the quotient in
1415 * cylinder_times_heads
1417 rem
= sector_div(cylinder_times_heads
,
1421 if (cylinder_times_heads
>= (heads
* 1024)) {
1422 sectors_per_track
= 63;
1425 cylinder_times_heads
= total_sectors
;
1427 * sector_div stores the quotient in
1428 * cylinder_times_heads
1430 rem
= sector_div(cylinder_times_heads
,
1435 temp
= cylinder_times_heads
;
1436 /* sector_div stores the quotient in temp */
1437 rem
= sector_div(temp
, heads
);
1441 hg
->sectors
= sectors_per_track
;
1442 hg
->cylinders
= cylinders
;
1444 DPRINT_INFO(BLKVSC_DRV
, "CHS (%d, %d, %d)", cylinders
, heads
,
1450 static int blkvsc_ioctl(struct block_device
*bd
, fmode_t mode
,
1451 unsigned cmd
, unsigned long argument
)
1453 /* struct block_device_context *blkdev = bd->bd_disk->private_data; */
1458 * TODO: I think there is certain format for HDIO_GET_IDENTITY rather
1459 * than just a GUID. Commented it out for now.
1462 case HDIO_GET_IDENTITY
:
1463 DPRINT_INFO(BLKVSC_DRV
, "HDIO_GET_IDENTITY\n");
1464 if (copy_to_user((void __user
*)arg
, blkdev
->device_id
,
1465 blkdev
->device_id_len
))
1477 static int __init
blkvsc_init(void)
1481 BUILD_BUG_ON(sizeof(sector_t
) != 8);
1483 DPRINT_INFO(BLKVSC_DRV
, "Blkvsc initializing....");
1485 ret
= blkvsc_drv_init(BlkVscInitialize
);
1490 static void __exit
blkvsc_exit(void)
1495 MODULE_LICENSE("GPL");
1496 MODULE_VERSION(HV_DRV_VERSION
);
1497 MODULE_DESCRIPTION("Microsoft Hyper-V virtual block driver");
1498 module_init(blkvsc_init
);
1499 module_exit(blkvsc_exit
);