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 <scsi/scsi.h>
29 #include <scsi/scsi_cmnd.h>
30 #include <scsi/scsi_eh.h>
31 #include <scsi/scsi_dbg.h>
35 #include "StorVscApi.h"
38 #define BLKVSC_MINORS 64
40 enum blkvsc_device_type
{
47 * This request ties the struct request and struct
48 * blkvsc_request/hv_storvsc_request together A struct request may be
49 * represented by 1 or more struct blkvsc_request
51 struct blkvsc_request_group
{
54 struct list_head blkvsc_req_list
; /* list of blkvsc_requests */
57 struct blkvsc_request
{
58 /* blkvsc_request_group.blkvsc_req_list */
59 struct list_head req_entry
;
61 /* block_device_context.pending_list */
62 struct list_head pend_entry
;
64 /* This may be null if we generate a request internally */
67 struct block_device_context
*dev
;
69 /* The group this request is part of. Maybe null */
70 struct blkvsc_request_group
*group
;
72 wait_queue_head_t wevent
;
76 sector_t sector_start
;
77 unsigned long sector_count
;
79 unsigned char sense_buffer
[SCSI_SENSE_BUFFERSIZE
];
80 unsigned char cmd_len
;
81 unsigned char cmnd
[MAX_COMMAND_SIZE
];
83 struct hv_storvsc_request request
;
85 * !!!DO NOT ADD ANYTHING BELOW HERE!!! Otherwise, memory can overlap,
86 * because - The extension buffer falls right here and is pointed to by
88 * Which sounds like a horrible idea, who designed this?
92 /* Per device structure */
93 struct block_device_context
{
94 /* point back to our device context */
95 struct device_context
*device_ctx
;
96 struct kmem_cache
*request_pool
;
99 enum blkvsc_device_type device_type
;
100 struct list_head pending_list
;
102 unsigned char device_id
[64];
103 unsigned int device_id_len
;
104 int num_outstanding_reqs
;
106 int media_not_present
;
107 unsigned int sector_size
;
111 unsigned char target
;
116 struct blkvsc_driver_context
{
117 /* !! These must be the first 2 fields !! */
118 /* FIXME this is a bug! */
119 struct driver_context drv_ctx
;
120 struct storvsc_driver_object drv_obj
;
124 static int blkvsc_probe(struct device
*dev
);
125 static int blkvsc_remove(struct device
*device
);
126 static void blkvsc_shutdown(struct device
*device
);
128 static int blkvsc_open(struct block_device
*bdev
, fmode_t mode
);
129 static int blkvsc_release(struct gendisk
*disk
, fmode_t mode
);
130 static int blkvsc_media_changed(struct gendisk
*gd
);
131 static int blkvsc_revalidate_disk(struct gendisk
*gd
);
132 static int blkvsc_getgeo(struct block_device
*bd
, struct hd_geometry
*hg
);
133 static int blkvsc_ioctl(struct block_device
*bd
, fmode_t mode
,
134 unsigned cmd
, unsigned long argument
);
135 static void blkvsc_request(struct request_queue
*queue
);
136 static void blkvsc_request_completion(struct hv_storvsc_request
*request
);
137 static int blkvsc_do_request(struct block_device_context
*blkdev
,
138 struct request
*req
);
139 static int blkvsc_submit_request(struct blkvsc_request
*blkvsc_req
,
140 void (*request_completion
)(struct hv_storvsc_request
*));
141 static void blkvsc_init_rw(struct blkvsc_request
*blkvsc_req
);
142 static void blkvsc_cmd_completion(struct hv_storvsc_request
*request
);
143 static int blkvsc_do_inquiry(struct block_device_context
*blkdev
);
144 static int blkvsc_do_read_capacity(struct block_device_context
*blkdev
);
145 static int blkvsc_do_read_capacity16(struct block_device_context
*blkdev
);
146 static int blkvsc_do_flush(struct block_device_context
*blkdev
);
147 static int blkvsc_cancel_pending_reqs(struct block_device_context
*blkdev
);
148 static int blkvsc_do_pending_reqs(struct block_device_context
*blkdev
);
151 static int blkvsc_ringbuffer_size
= BLKVSC_RING_BUFFER_SIZE
;
153 /* The one and only one */
154 static struct blkvsc_driver_context g_blkvsc_drv
;
156 static struct block_device_operations block_ops
= {
157 .owner
= THIS_MODULE
,
159 .release
= blkvsc_release
,
160 .media_changed
= blkvsc_media_changed
,
161 .revalidate_disk
= blkvsc_revalidate_disk
,
162 .getgeo
= blkvsc_getgeo
,
163 .ioctl
= blkvsc_ioctl
,
167 * blkvsc_drv_init - BlkVsc driver initialization.
169 static int blkvsc_drv_init(int (*drv_init
)(struct hv_driver
*drv
))
171 struct storvsc_driver_object
*storvsc_drv_obj
= &g_blkvsc_drv
.drv_obj
;
172 struct driver_context
*drv_ctx
= &g_blkvsc_drv
.drv_ctx
;
175 DPRINT_ENTER(BLKVSC_DRV
);
177 vmbus_get_interface(&storvsc_drv_obj
->Base
.VmbusChannelInterface
);
179 storvsc_drv_obj
->RingBufferSize
= blkvsc_ringbuffer_size
;
181 /* Callback to client driver to complete the initialization */
182 drv_init(&storvsc_drv_obj
->Base
);
184 drv_ctx
->driver
.name
= storvsc_drv_obj
->Base
.name
;
185 memcpy(&drv_ctx
->class_id
, &storvsc_drv_obj
->Base
.deviceType
,
186 sizeof(struct hv_guid
));
188 drv_ctx
->probe
= blkvsc_probe
;
189 drv_ctx
->remove
= blkvsc_remove
;
190 drv_ctx
->shutdown
= blkvsc_shutdown
;
192 /* The driver belongs to vmbus */
193 ret
= vmbus_child_driver_register(drv_ctx
);
195 DPRINT_EXIT(BLKVSC_DRV
);
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
;
214 DPRINT_ENTER(BLKVSC_DRV
);
220 ret
= driver_for_each_device(&drv_ctx
->driver
, NULL
,
221 (void *) ¤t_dev
,
225 DPRINT_WARN(BLKVSC_DRV
,
226 "driver_for_each_device returned %d", ret
);
229 if (current_dev
== NULL
)
232 /* Initiate removal from the top-down */
233 device_unregister(current_dev
);
236 if (storvsc_drv_obj
->Base
.OnCleanup
)
237 storvsc_drv_obj
->Base
.OnCleanup(&storvsc_drv_obj
->Base
);
239 vmbus_child_driver_unregister(drv_ctx
);
241 DPRINT_EXIT(BLKVSC_DRV
);
247 * blkvsc_probe - Add a new device for this driver
249 static int blkvsc_probe(struct device
*device
)
251 struct driver_context
*driver_ctx
=
252 driver_to_driver_context(device
->driver
);
253 struct blkvsc_driver_context
*blkvsc_drv_ctx
=
254 (struct blkvsc_driver_context
*)driver_ctx
;
255 struct storvsc_driver_object
*storvsc_drv_obj
=
256 &blkvsc_drv_ctx
->drv_obj
;
257 struct device_context
*device_ctx
= device_to_device_context(device
);
258 struct hv_device
*device_obj
= &device_ctx
->device_obj
;
260 struct block_device_context
*blkdev
= NULL
;
261 struct storvsc_device_info device_info
;
265 static int ide0_registered
;
266 static int ide1_registered
;
268 DPRINT_ENTER(BLKVSC_DRV
);
270 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_probe - enter");
272 if (!storvsc_drv_obj
->Base
.OnDeviceAdd
) {
273 DPRINT_ERR(BLKVSC_DRV
, "OnDeviceAdd() not set");
278 blkdev
= kzalloc(sizeof(struct block_device_context
), GFP_KERNEL
);
284 INIT_LIST_HEAD(&blkdev
->pending_list
);
286 /* Initialize what we can here */
287 spin_lock_init(&blkdev
->lock
);
289 ASSERT(sizeof(struct blkvsc_request_group
) <=
290 sizeof(struct blkvsc_request
));
292 blkdev
->request_pool
= kmem_cache_create(dev_name(&device_ctx
->device
),
293 sizeof(struct blkvsc_request
) +
294 storvsc_drv_obj
->RequestExtSize
, 0,
295 SLAB_HWCACHE_ALIGN
, NULL
);
296 if (!blkdev
->request_pool
) {
302 /* Call to the vsc driver to add the device */
303 ret
= storvsc_drv_obj
->Base
.OnDeviceAdd(device_obj
, &device_info
);
305 DPRINT_ERR(BLKVSC_DRV
, "unable to add blkvsc device");
309 blkdev
->device_ctx
= device_ctx
;
310 /* this identified the device 0 or 1 */
311 blkdev
->target
= device_info
.TargetId
;
312 /* this identified the ide ctrl 0 or 1 */
313 blkdev
->path
= device_info
.PathId
;
315 dev_set_drvdata(device
, blkdev
);
317 /* Calculate the major and device num */
318 if (blkdev
->path
== 0) {
320 devnum
= blkdev
->path
+ blkdev
->target
; /* 0 or 1 */
322 if (!ide0_registered
) {
323 ret
= register_blkdev(major
, "ide");
325 DPRINT_ERR(BLKVSC_DRV
,
326 "register_blkdev() failed! ret %d",
333 } else if (blkdev
->path
== 1) {
335 devnum
= blkdev
->path
+ blkdev
->target
+ 1; /* 2 or 3 */
337 if (!ide1_registered
) {
338 ret
= register_blkdev(major
, "ide");
340 DPRINT_ERR(BLKVSC_DRV
,
341 "register_blkdev() failed! ret %d",
349 DPRINT_ERR(BLKVSC_DRV
, "invalid pathid");
354 DPRINT_INFO(BLKVSC_DRV
, "blkvsc registered for major %d!!", major
);
356 blkdev
->gd
= alloc_disk(BLKVSC_MINORS
);
358 DPRINT_ERR(BLKVSC_DRV
, "register_blkdev() failed! ret %d", ret
);
363 blkdev
->gd
->queue
= blk_init_queue(blkvsc_request
, &blkdev
->lock
);
365 blk_queue_max_segment_size(blkdev
->gd
->queue
, PAGE_SIZE
);
366 blk_queue_max_segments(blkdev
->gd
->queue
, MAX_MULTIPAGE_BUFFER_COUNT
);
367 blk_queue_segment_boundary(blkdev
->gd
->queue
, PAGE_SIZE
-1);
368 blk_queue_bounce_limit(blkdev
->gd
->queue
, BLK_BOUNCE_ANY
);
369 blk_queue_dma_alignment(blkdev
->gd
->queue
, 511);
371 blkdev
->gd
->major
= major
;
372 if (devnum
== 1 || devnum
== 3)
373 blkdev
->gd
->first_minor
= BLKVSC_MINORS
;
375 blkdev
->gd
->first_minor
= 0;
376 blkdev
->gd
->fops
= &block_ops
;
377 blkdev
->gd
->private_data
= blkdev
;
378 sprintf(blkdev
->gd
->disk_name
, "hd%c", 'a' + devnum
);
380 blkvsc_do_inquiry(blkdev
);
381 if (blkdev
->device_type
== DVD_TYPE
) {
382 set_disk_ro(blkdev
->gd
, 1);
383 blkdev
->gd
->flags
|= GENHD_FL_REMOVABLE
;
384 blkvsc_do_read_capacity(blkdev
);
386 blkvsc_do_read_capacity16(blkdev
);
389 set_capacity(blkdev
->gd
, blkdev
->capacity
* (blkdev
->sector_size
/512));
390 blk_queue_logical_block_size(blkdev
->gd
->queue
, blkdev
->sector_size
);
392 add_disk(blkdev
->gd
);
394 DPRINT_INFO(BLKVSC_DRV
, "%s added!! capacity %lu sector_size %d",
395 blkdev
->gd
->disk_name
, (unsigned long)blkdev
->capacity
,
396 blkdev
->sector_size
);
401 storvsc_drv_obj
->Base
.OnDeviceRemove(device_obj
);
405 if (blkdev
->request_pool
) {
406 kmem_cache_destroy(blkdev
->request_pool
);
407 blkdev
->request_pool
= NULL
;
413 DPRINT_EXIT(BLKVSC_DRV
);
418 static void blkvsc_shutdown(struct device
*device
)
420 struct block_device_context
*blkdev
= dev_get_drvdata(device
);
426 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_shutdown - users %d disk %s\n",
427 blkdev
->users
, blkdev
->gd
->disk_name
);
429 spin_lock_irqsave(&blkdev
->lock
, flags
);
431 blkdev
->shutting_down
= 1;
433 blk_stop_queue(blkdev
->gd
->queue
);
435 spin_unlock_irqrestore(&blkdev
->lock
, flags
);
437 while (blkdev
->num_outstanding_reqs
) {
438 DPRINT_INFO(STORVSC
, "waiting for %d requests to complete...",
439 blkdev
->num_outstanding_reqs
);
443 blkvsc_do_flush(blkdev
);
445 spin_lock_irqsave(&blkdev
->lock
, flags
);
447 blkvsc_cancel_pending_reqs(blkdev
);
449 spin_unlock_irqrestore(&blkdev
->lock
, flags
);
452 static int blkvsc_do_flush(struct block_device_context
*blkdev
)
454 struct blkvsc_request
*blkvsc_req
;
456 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_do_flush()\n");
458 if (blkdev
->device_type
!= HARDDISK_TYPE
)
461 blkvsc_req
= kmem_cache_alloc(blkdev
->request_pool
, GFP_KERNEL
);
465 memset(blkvsc_req
, 0, sizeof(struct blkvsc_request
));
466 init_waitqueue_head(&blkvsc_req
->wevent
);
467 blkvsc_req
->dev
= blkdev
;
468 blkvsc_req
->req
= NULL
;
469 blkvsc_req
->write
= 0;
471 blkvsc_req
->request
.DataBuffer
.PfnArray
[0] = 0;
472 blkvsc_req
->request
.DataBuffer
.Offset
= 0;
473 blkvsc_req
->request
.DataBuffer
.Length
= 0;
475 blkvsc_req
->cmnd
[0] = SYNCHRONIZE_CACHE
;
476 blkvsc_req
->cmd_len
= 10;
479 * Set this here since the completion routine may be invoked and
480 * completed before we return
482 blkvsc_req
->cond
= 0;
483 blkvsc_submit_request(blkvsc_req
, blkvsc_cmd_completion
);
485 wait_event_interruptible(blkvsc_req
->wevent
, blkvsc_req
->cond
);
487 kmem_cache_free(blkvsc_req
->dev
->request_pool
, blkvsc_req
);
492 /* Do a scsi INQUIRY cmd here to get the device type (ie disk or dvd) */
493 static int blkvsc_do_inquiry(struct block_device_context
*blkdev
)
495 struct blkvsc_request
*blkvsc_req
;
496 struct page
*page_buf
;
498 unsigned char device_type
;
500 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_do_inquiry()\n");
502 blkvsc_req
= kmem_cache_alloc(blkdev
->request_pool
, GFP_KERNEL
);
506 memset(blkvsc_req
, 0, sizeof(struct blkvsc_request
));
507 page_buf
= alloc_page(GFP_KERNEL
);
509 kmem_cache_free(blkvsc_req
->dev
->request_pool
, blkvsc_req
);
513 init_waitqueue_head(&blkvsc_req
->wevent
);
514 blkvsc_req
->dev
= blkdev
;
515 blkvsc_req
->req
= NULL
;
516 blkvsc_req
->write
= 0;
518 blkvsc_req
->request
.DataBuffer
.PfnArray
[0] = page_to_pfn(page_buf
);
519 blkvsc_req
->request
.DataBuffer
.Offset
= 0;
520 blkvsc_req
->request
.DataBuffer
.Length
= 64;
522 blkvsc_req
->cmnd
[0] = INQUIRY
;
523 blkvsc_req
->cmnd
[1] = 0x1; /* Get product data */
524 blkvsc_req
->cmnd
[2] = 0x83; /* mode page 83 */
525 blkvsc_req
->cmnd
[4] = 64;
526 blkvsc_req
->cmd_len
= 6;
529 * Set this here since the completion routine may be invoked and
530 * completed before we return
532 blkvsc_req
->cond
= 0;
534 blkvsc_submit_request(blkvsc_req
, blkvsc_cmd_completion
);
536 DPRINT_DBG(BLKVSC_DRV
, "waiting %p to complete - cond %d\n",
537 blkvsc_req
, blkvsc_req
->cond
);
539 wait_event_interruptible(blkvsc_req
->wevent
, blkvsc_req
->cond
);
541 buf
= kmap(page_buf
);
543 /* print_hex_dump_bytes("", DUMP_PREFIX_NONE, buf, 64); */
545 device_type
= buf
[0] & 0x1F;
547 if (device_type
== 0x0) {
548 blkdev
->device_type
= HARDDISK_TYPE
;
549 } else if (device_type
== 0x5) {
550 blkdev
->device_type
= DVD_TYPE
;
552 /* TODO: this is currently unsupported device type */
553 blkdev
->device_type
= UNKNOWN_DEV_TYPE
;
556 DPRINT_DBG(BLKVSC_DRV
, "device type %d \n", device_type
);
558 blkdev
->device_id_len
= buf
[7];
559 if (blkdev
->device_id_len
> 64)
560 blkdev
->device_id_len
= 64;
562 memcpy(blkdev
->device_id
, &buf
[8], blkdev
->device_id_len
);
563 /* printk_hex_dump_bytes("", DUMP_PREFIX_NONE, blkdev->device_id,
564 * blkdev->device_id_len); */
568 __free_page(page_buf
);
570 kmem_cache_free(blkvsc_req
->dev
->request_pool
, blkvsc_req
);
575 /* Do a scsi READ_CAPACITY cmd here to get the size of the disk */
576 static int blkvsc_do_read_capacity(struct block_device_context
*blkdev
)
578 struct blkvsc_request
*blkvsc_req
;
579 struct page
*page_buf
;
581 struct scsi_sense_hdr sense_hdr
;
583 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_do_read_capacity()\n");
585 blkdev
->sector_size
= 0;
586 blkdev
->capacity
= 0;
587 blkdev
->media_not_present
= 0; /* assume a disk is present */
589 blkvsc_req
= kmem_cache_alloc(blkdev
->request_pool
, GFP_KERNEL
);
593 memset(blkvsc_req
, 0, sizeof(struct blkvsc_request
));
594 page_buf
= alloc_page(GFP_KERNEL
);
596 kmem_cache_free(blkvsc_req
->dev
->request_pool
, blkvsc_req
);
600 init_waitqueue_head(&blkvsc_req
->wevent
);
601 blkvsc_req
->dev
= blkdev
;
602 blkvsc_req
->req
= NULL
;
603 blkvsc_req
->write
= 0;
605 blkvsc_req
->request
.DataBuffer
.PfnArray
[0] = page_to_pfn(page_buf
);
606 blkvsc_req
->request
.DataBuffer
.Offset
= 0;
607 blkvsc_req
->request
.DataBuffer
.Length
= 8;
609 blkvsc_req
->cmnd
[0] = READ_CAPACITY
;
610 blkvsc_req
->cmd_len
= 16;
613 * Set this here since the completion routine may be invoked
614 * and completed before we return
616 blkvsc_req
->cond
= 0;
618 blkvsc_submit_request(blkvsc_req
, blkvsc_cmd_completion
);
620 DPRINT_DBG(BLKVSC_DRV
, "waiting %p to complete - cond %d\n",
621 blkvsc_req
, blkvsc_req
->cond
);
623 wait_event_interruptible(blkvsc_req
->wevent
, blkvsc_req
->cond
);
626 if (blkvsc_req
->request
.Status
) {
627 scsi_normalize_sense(blkvsc_req
->sense_buffer
,
628 SCSI_SENSE_BUFFERSIZE
, &sense_hdr
);
630 if (sense_hdr
.asc
== 0x3A) {
631 /* Medium not present */
632 blkdev
->media_not_present
= 1;
636 buf
= kmap(page_buf
);
639 blkdev
->capacity
= ((buf
[0] << 24) | (buf
[1] << 16) |
640 (buf
[2] << 8) | buf
[3]) + 1;
641 blkdev
->sector_size
= (buf
[4] << 24) | (buf
[5] << 16) |
642 (buf
[6] << 8) | buf
[7];
646 __free_page(page_buf
);
648 kmem_cache_free(blkvsc_req
->dev
->request_pool
, blkvsc_req
);
653 static int blkvsc_do_read_capacity16(struct block_device_context
*blkdev
)
655 struct blkvsc_request
*blkvsc_req
;
656 struct page
*page_buf
;
658 struct scsi_sense_hdr sense_hdr
;
660 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_do_read_capacity16()\n");
662 blkdev
->sector_size
= 0;
663 blkdev
->capacity
= 0;
664 blkdev
->media_not_present
= 0; /* assume a disk is present */
666 blkvsc_req
= kmem_cache_alloc(blkdev
->request_pool
, GFP_KERNEL
);
670 memset(blkvsc_req
, 0, sizeof(struct blkvsc_request
));
671 page_buf
= alloc_page(GFP_KERNEL
);
673 kmem_cache_free(blkvsc_req
->dev
->request_pool
, blkvsc_req
);
677 init_waitqueue_head(&blkvsc_req
->wevent
);
678 blkvsc_req
->dev
= blkdev
;
679 blkvsc_req
->req
= NULL
;
680 blkvsc_req
->write
= 0;
682 blkvsc_req
->request
.DataBuffer
.PfnArray
[0] = page_to_pfn(page_buf
);
683 blkvsc_req
->request
.DataBuffer
.Offset
= 0;
684 blkvsc_req
->request
.DataBuffer
.Length
= 12;
686 blkvsc_req
->cmnd
[0] = 0x9E; /* READ_CAPACITY16; */
687 blkvsc_req
->cmd_len
= 16;
690 * Set this here since the completion routine may be invoked
691 * and completed before we return
693 blkvsc_req
->cond
= 0;
695 blkvsc_submit_request(blkvsc_req
, blkvsc_cmd_completion
);
697 DPRINT_DBG(BLKVSC_DRV
, "waiting %p to complete - cond %d\n",
698 blkvsc_req
, blkvsc_req
->cond
);
700 wait_event_interruptible(blkvsc_req
->wevent
, blkvsc_req
->cond
);
703 if (blkvsc_req
->request
.Status
) {
704 scsi_normalize_sense(blkvsc_req
->sense_buffer
,
705 SCSI_SENSE_BUFFERSIZE
, &sense_hdr
);
706 if (sense_hdr
.asc
== 0x3A) {
707 /* Medium not present */
708 blkdev
->media_not_present
= 1;
712 buf
= kmap(page_buf
);
715 blkdev
->capacity
= be64_to_cpu(*(unsigned long long *) &buf
[0]) + 1;
716 blkdev
->sector_size
= be32_to_cpu(*(unsigned int *)&buf
[8]);
719 blkdev
->capacity
= ((buf
[0] << 24) | (buf
[1] << 16) |
720 (buf
[2] << 8) | buf
[3]) + 1;
721 blkdev
->sector_size
= (buf
[4] << 24) | (buf
[5] << 16) |
722 (buf
[6] << 8) | buf
[7];
727 __free_page(page_buf
);
729 kmem_cache_free(blkvsc_req
->dev
->request_pool
, blkvsc_req
);
735 * blkvsc_remove() - Callback when our device is removed
737 static int blkvsc_remove(struct device
*device
)
739 struct driver_context
*driver_ctx
=
740 driver_to_driver_context(device
->driver
);
741 struct blkvsc_driver_context
*blkvsc_drv_ctx
=
742 (struct blkvsc_driver_context
*)driver_ctx
;
743 struct storvsc_driver_object
*storvsc_drv_obj
=
744 &blkvsc_drv_ctx
->drv_obj
;
745 struct device_context
*device_ctx
= device_to_device_context(device
);
746 struct hv_device
*device_obj
= &device_ctx
->device_obj
;
747 struct block_device_context
*blkdev
= dev_get_drvdata(device
);
751 DPRINT_ENTER(BLKVSC_DRV
);
753 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_remove()\n");
755 if (!storvsc_drv_obj
->Base
.OnDeviceRemove
) {
756 DPRINT_EXIT(BLKVSC_DRV
);
761 * Call to the vsc driver to let it know that the device is being
764 ret
= storvsc_drv_obj
->Base
.OnDeviceRemove(device_obj
);
767 DPRINT_ERR(BLKVSC_DRV
,
768 "unable to remove blkvsc device (ret %d)", ret
);
771 /* Get to a known state */
772 spin_lock_irqsave(&blkdev
->lock
, flags
);
774 blkdev
->shutting_down
= 1;
776 blk_stop_queue(blkdev
->gd
->queue
);
778 spin_unlock_irqrestore(&blkdev
->lock
, flags
);
780 while (blkdev
->num_outstanding_reqs
) {
781 DPRINT_INFO(STORVSC
, "waiting for %d requests to complete...",
782 blkdev
->num_outstanding_reqs
);
786 blkvsc_do_flush(blkdev
);
788 spin_lock_irqsave(&blkdev
->lock
, flags
);
790 blkvsc_cancel_pending_reqs(blkdev
);
792 spin_unlock_irqrestore(&blkdev
->lock
, flags
);
794 blk_cleanup_queue(blkdev
->gd
->queue
);
796 del_gendisk(blkdev
->gd
);
798 kmem_cache_destroy(blkdev
->request_pool
);
802 DPRINT_EXIT(BLKVSC_DRV
);
807 static void blkvsc_init_rw(struct blkvsc_request
*blkvsc_req
)
809 ASSERT(blkvsc_req
->req
);
810 ASSERT(blkvsc_req
->sector_count
<= (MAX_MULTIPAGE_BUFFER_COUNT
*8));
812 blkvsc_req
->cmd_len
= 16;
814 if (blkvsc_req
->sector_start
> 0xffffffff) {
815 if (rq_data_dir(blkvsc_req
->req
)) {
816 blkvsc_req
->write
= 1;
817 blkvsc_req
->cmnd
[0] = WRITE_16
;
819 blkvsc_req
->write
= 0;
820 blkvsc_req
->cmnd
[0] = READ_16
;
823 blkvsc_req
->cmnd
[1] |= blk_fua_rq(blkvsc_req
->req
) ? 0x8 : 0;
825 *(unsigned long long *)&blkvsc_req
->cmnd
[2] =
826 cpu_to_be64(blkvsc_req
->sector_start
);
827 *(unsigned int *)&blkvsc_req
->cmnd
[10] =
828 cpu_to_be32(blkvsc_req
->sector_count
);
829 } else if ((blkvsc_req
->sector_count
> 0xff) ||
830 (blkvsc_req
->sector_start
> 0x1fffff)) {
831 if (rq_data_dir(blkvsc_req
->req
)) {
832 blkvsc_req
->write
= 1;
833 blkvsc_req
->cmnd
[0] = WRITE_10
;
835 blkvsc_req
->write
= 0;
836 blkvsc_req
->cmnd
[0] = READ_10
;
839 blkvsc_req
->cmnd
[1] |= blk_fua_rq(blkvsc_req
->req
) ? 0x8 : 0;
841 *(unsigned int *)&blkvsc_req
->cmnd
[2] =
842 cpu_to_be32(blkvsc_req
->sector_start
);
843 *(unsigned short *)&blkvsc_req
->cmnd
[7] =
844 cpu_to_be16(blkvsc_req
->sector_count
);
846 if (rq_data_dir(blkvsc_req
->req
)) {
847 blkvsc_req
->write
= 1;
848 blkvsc_req
->cmnd
[0] = WRITE_6
;
850 blkvsc_req
->write
= 0;
851 blkvsc_req
->cmnd
[0] = READ_6
;
854 *(unsigned int *)&blkvsc_req
->cmnd
[1] =
855 cpu_to_be32(blkvsc_req
->sector_start
) >> 8;
856 blkvsc_req
->cmnd
[1] &= 0x1f;
857 blkvsc_req
->cmnd
[4] = (unsigned char)blkvsc_req
->sector_count
;
861 static int blkvsc_submit_request(struct blkvsc_request
*blkvsc_req
,
862 void (*request_completion
)(struct hv_storvsc_request
*))
864 struct block_device_context
*blkdev
= blkvsc_req
->dev
;
865 struct device_context
*device_ctx
= blkdev
->device_ctx
;
866 struct driver_context
*driver_ctx
=
867 driver_to_driver_context(device_ctx
->device
.driver
);
868 struct blkvsc_driver_context
*blkvsc_drv_ctx
=
869 (struct blkvsc_driver_context
*)driver_ctx
;
870 struct storvsc_driver_object
*storvsc_drv_obj
=
871 &blkvsc_drv_ctx
->drv_obj
;
872 struct hv_storvsc_request
*storvsc_req
;
875 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_submit_request() - "
876 "req %p type %s start_sector %lu count %ld offset %d "
877 "len %d\n", blkvsc_req
,
878 (blkvsc_req
->write
) ? "WRITE" : "READ",
879 (unsigned long) blkvsc_req
->sector_start
,
880 blkvsc_req
->sector_count
,
881 blkvsc_req
->request
.DataBuffer
.Offset
,
882 blkvsc_req
->request
.DataBuffer
.Length
);
884 for (i
= 0; i
< (blkvsc_req
->request
.DataBuffer
.Length
>> 12); i
++) {
885 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_submit_request() - "
886 "req %p pfn[%d] %llx\n",
888 blkvsc_req
->request
.DataBuffer
.PfnArray
[i
]);
892 storvsc_req
= &blkvsc_req
->request
;
893 storvsc_req
->Extension
= (void *)((unsigned long)blkvsc_req
+
894 sizeof(struct blkvsc_request
));
896 storvsc_req
->Type
= blkvsc_req
->write
? WRITE_TYPE
: READ_TYPE
;
898 storvsc_req
->OnIOCompletion
= request_completion
;
899 storvsc_req
->Context
= blkvsc_req
;
901 storvsc_req
->Host
= blkdev
->port
;
902 storvsc_req
->Bus
= blkdev
->path
;
903 storvsc_req
->TargetId
= blkdev
->target
;
904 storvsc_req
->LunId
= 0; /* this is not really used at all */
906 storvsc_req
->CdbLen
= blkvsc_req
->cmd_len
;
907 storvsc_req
->Cdb
= blkvsc_req
->cmnd
;
909 storvsc_req
->SenseBuffer
= blkvsc_req
->sense_buffer
;
910 storvsc_req
->SenseBufferSize
= SCSI_SENSE_BUFFERSIZE
;
912 ret
= storvsc_drv_obj
->OnIORequest(&blkdev
->device_ctx
->device_obj
,
913 &blkvsc_req
->request
);
915 blkdev
->num_outstanding_reqs
++;
921 * We break the request into 1 or more blkvsc_requests and submit
922 * them. If we cant submit them all, we put them on the
923 * pending_list. The blkvsc_request() will work on the pending_list.
925 static int blkvsc_do_request(struct block_device_context
*blkdev
,
928 struct bio
*bio
= NULL
;
929 struct bio_vec
*bvec
= NULL
;
930 struct bio_vec
*prev_bvec
= NULL
;
931 struct blkvsc_request
*blkvsc_req
= NULL
;
932 struct blkvsc_request
*tmp
;
935 sector_t start_sector
;
936 unsigned long num_sectors
= 0;
939 struct blkvsc_request_group
*group
= NULL
;
941 DPRINT_DBG(BLKVSC_DRV
, "blkdev %p req %p sect %lu \n", blkdev
, req
,
942 (unsigned long)blk_rq_pos(req
));
944 /* Create a group to tie req to list of blkvsc_reqs */
945 group
= kmem_cache_alloc(blkdev
->request_pool
, GFP_ATOMIC
);
949 INIT_LIST_HEAD(&group
->blkvsc_req_list
);
950 group
->outstanding
= group
->status
= 0;
952 start_sector
= blk_rq_pos(req
);
954 /* foreach bio in the request */
956 for (bio
= req
->bio
; bio
; bio
= bio
->bi_next
) {
958 * Map this bio into an existing or new storvsc request
960 bio_for_each_segment(bvec
, bio
, seg_idx
) {
961 DPRINT_DBG(BLKVSC_DRV
, "bio_for_each_segment() "
962 "- req %p bio %p bvec %p seg_idx %d "
963 "databuf_idx %d\n", req
, bio
, bvec
,
964 seg_idx
, databuf_idx
);
966 /* Get a new storvsc request */
969 (databuf_idx
>= MAX_MULTIPAGE_BUFFER_COUNT
)
970 /* hole at the begin of page */
971 || (bvec
->bv_offset
!= 0) ||
972 /* hold at the end of page */
974 (prev_bvec
->bv_len
!= PAGE_SIZE
))) {
975 /* submit the prev one */
977 blkvsc_req
->sector_start
= start_sector
;
978 sector_div(blkvsc_req
->sector_start
, (blkdev
->sector_size
>> 9));
980 blkvsc_req
->sector_count
= num_sectors
/ (blkdev
->sector_size
>> 9);
981 blkvsc_init_rw(blkvsc_req
);
985 * Create new blkvsc_req to represent
988 blkvsc_req
= kmem_cache_alloc(blkdev
->request_pool
, GFP_ATOMIC
);
990 /* free up everything */
991 list_for_each_entry_safe(
993 &group
->blkvsc_req_list
,
995 list_del(&blkvsc_req
->req_entry
);
996 kmem_cache_free(blkdev
->request_pool
, blkvsc_req
);
999 kmem_cache_free(blkdev
->request_pool
, group
);
1003 memset(blkvsc_req
, 0,
1004 sizeof(struct blkvsc_request
));
1006 blkvsc_req
->dev
= blkdev
;
1007 blkvsc_req
->req
= req
;
1008 blkvsc_req
->request
.DataBuffer
.Offset
= bvec
->bv_offset
;
1009 blkvsc_req
->request
.DataBuffer
.Length
= 0;
1011 /* Add to the group */
1012 blkvsc_req
->group
= group
;
1013 blkvsc_req
->group
->outstanding
++;
1014 list_add_tail(&blkvsc_req
->req_entry
,
1015 &blkvsc_req
->group
->blkvsc_req_list
);
1017 start_sector
+= num_sectors
;
1022 /* Add the curr bvec/segment to the curr blkvsc_req */
1023 blkvsc_req
->request
.DataBuffer
.PfnArray
[databuf_idx
] = page_to_pfn(bvec
->bv_page
);
1024 blkvsc_req
->request
.DataBuffer
.Length
+= bvec
->bv_len
;
1029 num_sectors
+= bvec
->bv_len
>> 9;
1031 } /* bio_for_each_segment */
1033 } /* rq_for_each_bio */
1036 /* Handle the last one */
1038 DPRINT_DBG(BLKVSC_DRV
, "blkdev %p req %p group %p count %d\n",
1039 blkdev
, req
, blkvsc_req
->group
,
1040 blkvsc_req
->group
->outstanding
);
1042 blkvsc_req
->sector_start
= start_sector
;
1043 sector_div(blkvsc_req
->sector_start
,
1044 (blkdev
->sector_size
>> 9));
1046 blkvsc_req
->sector_count
= num_sectors
/
1047 (blkdev
->sector_size
>> 9);
1049 blkvsc_init_rw(blkvsc_req
);
1052 list_for_each_entry(blkvsc_req
, &group
->blkvsc_req_list
, req_entry
) {
1054 DPRINT_DBG(BLKVSC_DRV
, "adding blkvsc_req to "
1055 "pending_list - blkvsc_req %p start_sect %lu"
1056 " sect_count %ld (%lu %ld)\n", blkvsc_req
,
1057 (unsigned long)blkvsc_req
->sector_start
,
1058 blkvsc_req
->sector_count
,
1059 (unsigned long)start_sector
,
1060 (unsigned long)num_sectors
);
1062 list_add_tail(&blkvsc_req
->pend_entry
,
1063 &blkdev
->pending_list
);
1065 ret
= blkvsc_submit_request(blkvsc_req
,
1066 blkvsc_request_completion
);
1069 list_add_tail(&blkvsc_req
->pend_entry
,
1070 &blkdev
->pending_list
);
1073 DPRINT_DBG(BLKVSC_DRV
, "submitted blkvsc_req %p "
1074 "start_sect %lu sect_count %ld (%lu %ld) "
1075 "ret %d\n", blkvsc_req
,
1076 (unsigned long)blkvsc_req
->sector_start
,
1077 blkvsc_req
->sector_count
,
1078 (unsigned long)start_sector
,
1086 static void blkvsc_cmd_completion(struct hv_storvsc_request
*request
)
1088 struct blkvsc_request
*blkvsc_req
=
1089 (struct blkvsc_request
*)request
->Context
;
1090 struct block_device_context
*blkdev
=
1091 (struct block_device_context
*)blkvsc_req
->dev
;
1092 struct scsi_sense_hdr sense_hdr
;
1094 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_cmd_completion() - req %p\n",
1097 blkdev
->num_outstanding_reqs
--;
1099 if (blkvsc_req
->request
.Status
)
1100 if (scsi_normalize_sense(blkvsc_req
->sense_buffer
,
1101 SCSI_SENSE_BUFFERSIZE
, &sense_hdr
))
1102 scsi_print_sense_hdr("blkvsc", &sense_hdr
);
1104 blkvsc_req
->cond
= 1;
1105 wake_up_interruptible(&blkvsc_req
->wevent
);
1108 static void blkvsc_request_completion(struct hv_storvsc_request
*request
)
1110 struct blkvsc_request
*blkvsc_req
=
1111 (struct blkvsc_request
*)request
->Context
;
1112 struct block_device_context
*blkdev
=
1113 (struct block_device_context
*)blkvsc_req
->dev
;
1114 unsigned long flags
;
1115 struct blkvsc_request
*comp_req
, *tmp
;
1117 ASSERT(blkvsc_req
->group
);
1119 DPRINT_DBG(BLKVSC_DRV
, "blkdev %p blkvsc_req %p group %p type %s "
1120 "sect_start %lu sect_count %ld len %d group outstd %d "
1121 "total outstd %d\n",
1122 blkdev
, blkvsc_req
, blkvsc_req
->group
,
1123 (blkvsc_req
->write
) ? "WRITE" : "READ",
1124 (unsigned long)blkvsc_req
->sector_start
,
1125 blkvsc_req
->sector_count
,
1126 blkvsc_req
->request
.DataBuffer
.Length
,
1127 blkvsc_req
->group
->outstanding
,
1128 blkdev
->num_outstanding_reqs
);
1130 spin_lock_irqsave(&blkdev
->lock
, flags
);
1132 blkdev
->num_outstanding_reqs
--;
1133 blkvsc_req
->group
->outstanding
--;
1136 * Only start processing when all the blkvsc_reqs are
1137 * completed. This guarantees no out-of-order blkvsc_req
1138 * completion when calling end_that_request_first()
1140 if (blkvsc_req
->group
->outstanding
== 0) {
1141 list_for_each_entry_safe(comp_req
, tmp
,
1142 &blkvsc_req
->group
->blkvsc_req_list
,
1144 DPRINT_DBG(BLKVSC_DRV
, "completing blkvsc_req %p "
1145 "sect_start %lu sect_count %ld \n",
1147 (unsigned long)comp_req
->sector_start
,
1148 comp_req
->sector_count
);
1150 list_del(&comp_req
->req_entry
);
1152 if (!__blk_end_request(comp_req
->req
,
1153 (!comp_req
->request
.Status
? 0 : -EIO
),
1154 comp_req
->sector_count
* blkdev
->sector_size
)) {
1156 * All the sectors have been xferred ie the
1159 DPRINT_DBG(BLKVSC_DRV
, "req %p COMPLETED\n",
1161 kmem_cache_free(blkdev
->request_pool
,
1165 kmem_cache_free(blkdev
->request_pool
, comp_req
);
1168 if (!blkdev
->shutting_down
) {
1169 blkvsc_do_pending_reqs(blkdev
);
1170 blk_start_queue(blkdev
->gd
->queue
);
1171 blkvsc_request(blkdev
->gd
->queue
);
1175 spin_unlock_irqrestore(&blkdev
->lock
, flags
);
1178 static int blkvsc_cancel_pending_reqs(struct block_device_context
*blkdev
)
1180 struct blkvsc_request
*pend_req
, *tmp
;
1181 struct blkvsc_request
*comp_req
, *tmp2
;
1185 DPRINT_DBG(BLKVSC_DRV
, "blkvsc_cancel_pending_reqs()");
1187 /* Flush the pending list first */
1188 list_for_each_entry_safe(pend_req
, tmp
, &blkdev
->pending_list
,
1191 * The pend_req could be part of a partially completed
1192 * request. If so, complete those req first until we
1195 list_for_each_entry_safe(comp_req
, tmp2
,
1196 &pend_req
->group
->blkvsc_req_list
,
1198 DPRINT_DBG(BLKVSC_DRV
, "completing blkvsc_req %p "
1199 "sect_start %lu sect_count %ld \n",
1201 (unsigned long) comp_req
->sector_start
,
1202 comp_req
->sector_count
);
1204 if (comp_req
== pend_req
)
1207 list_del(&comp_req
->req_entry
);
1209 if (comp_req
->req
) {
1210 ret
= __blk_end_request(comp_req
->req
,
1211 (!comp_req
->request
.Status
? 0 : -EIO
),
1212 comp_req
->sector_count
*
1213 blkdev
->sector_size
);
1217 kmem_cache_free(blkdev
->request_pool
, comp_req
);
1220 DPRINT_DBG(BLKVSC_DRV
, "cancelling pending request - %p\n",
1223 list_del(&pend_req
->pend_entry
);
1225 list_del(&pend_req
->req_entry
);
1227 if (comp_req
->req
) {
1228 if (!__blk_end_request(pend_req
->req
, -EIO
,
1229 pend_req
->sector_count
*
1230 blkdev
->sector_size
)) {
1232 * All the sectors have been xferred ie the
1235 DPRINT_DBG(BLKVSC_DRV
,
1236 "blkvsc_cancel_pending_reqs() - "
1237 "req %p COMPLETED\n", pend_req
->req
);
1238 kmem_cache_free(blkdev
->request_pool
,
1243 kmem_cache_free(blkdev
->request_pool
, pend_req
);
1249 static int blkvsc_do_pending_reqs(struct block_device_context
*blkdev
)
1251 struct blkvsc_request
*pend_req
, *tmp
;
1254 /* Flush the pending list first */
1255 list_for_each_entry_safe(pend_req
, tmp
, &blkdev
->pending_list
,
1257 DPRINT_DBG(BLKVSC_DRV
, "working off pending_list - %p\n",
1260 ret
= blkvsc_submit_request(pend_req
,
1261 blkvsc_request_completion
);
1265 list_del(&pend_req
->pend_entry
);
1271 static void blkvsc_request(struct request_queue
*queue
)
1273 struct block_device_context
*blkdev
= NULL
;
1274 struct request
*req
;
1277 DPRINT_DBG(BLKVSC_DRV
, "- enter \n");
1278 while ((req
= blk_peek_request(queue
)) != NULL
) {
1279 DPRINT_DBG(BLKVSC_DRV
, "- req %p\n", req
);
1281 blkdev
= req
->rq_disk
->private_data
;
1282 if (blkdev
->shutting_down
|| !blk_fs_request(req
) ||
1283 blkdev
->media_not_present
) {
1284 __blk_end_request_cur(req
, 0);
1288 ret
= blkvsc_do_pending_reqs(blkdev
);
1291 DPRINT_DBG(BLKVSC_DRV
,
1292 "- stop queue - pending_list not empty\n");
1293 blk_stop_queue(queue
);
1297 blk_start_request(req
);
1299 ret
= blkvsc_do_request(blkdev
, req
);
1301 DPRINT_DBG(BLKVSC_DRV
, "- stop queue - no room\n");
1302 blk_stop_queue(queue
);
1304 } else if (ret
< 0) {
1305 DPRINT_DBG(BLKVSC_DRV
, "- stop queue - no mem\n");
1306 blk_requeue_request(queue
, req
);
1307 blk_stop_queue(queue
);
1313 static int blkvsc_open(struct block_device
*bdev
, fmode_t mode
)
1315 struct block_device_context
*blkdev
= bdev
->bd_disk
->private_data
;
1317 DPRINT_DBG(BLKVSC_DRV
, "- users %d disk %s\n", blkdev
->users
,
1318 blkdev
->gd
->disk_name
);
1320 spin_lock(&blkdev
->lock
);
1322 if (!blkdev
->users
&& blkdev
->device_type
== DVD_TYPE
) {
1323 spin_unlock(&blkdev
->lock
);
1324 check_disk_change(bdev
);
1325 spin_lock(&blkdev
->lock
);
1330 spin_unlock(&blkdev
->lock
);
1334 static int blkvsc_release(struct gendisk
*disk
, fmode_t mode
)
1336 struct block_device_context
*blkdev
= disk
->private_data
;
1338 DPRINT_DBG(BLKVSC_DRV
, "- users %d disk %s\n", blkdev
->users
,
1339 blkdev
->gd
->disk_name
);
1341 spin_lock(&blkdev
->lock
);
1342 if (blkdev
->users
== 1) {
1343 spin_unlock(&blkdev
->lock
);
1344 blkvsc_do_flush(blkdev
);
1345 spin_lock(&blkdev
->lock
);
1350 spin_unlock(&blkdev
->lock
);
1354 static int blkvsc_media_changed(struct gendisk
*gd
)
1356 DPRINT_DBG(BLKVSC_DRV
, "- enter\n");
1360 static int blkvsc_revalidate_disk(struct gendisk
*gd
)
1362 struct block_device_context
*blkdev
= gd
->private_data
;
1364 DPRINT_DBG(BLKVSC_DRV
, "- enter\n");
1366 if (blkdev
->device_type
== DVD_TYPE
) {
1367 blkvsc_do_read_capacity(blkdev
);
1368 set_capacity(blkdev
->gd
, blkdev
->capacity
*
1369 (blkdev
->sector_size
/512));
1370 blk_queue_logical_block_size(gd
->queue
, blkdev
->sector_size
);
1375 static int blkvsc_getgeo(struct block_device
*bd
, struct hd_geometry
*hg
)
1377 sector_t total_sectors
= get_capacity(bd
->bd_disk
);
1378 sector_t cylinder_times_heads
= 0;
1381 int sectors_per_track
= 0;
1386 if (total_sectors
> (65535 * 16 * 255))
1387 total_sectors
= (65535 * 16 * 255);
1389 if (total_sectors
>= (65535 * 16 * 63)) {
1390 sectors_per_track
= 255;
1393 cylinder_times_heads
= total_sectors
;
1394 /* sector_div stores the quotient in cylinder_times_heads */
1395 rem
= sector_div(cylinder_times_heads
, sectors_per_track
);
1397 sectors_per_track
= 17;
1399 cylinder_times_heads
= total_sectors
;
1400 /* sector_div stores the quotient in cylinder_times_heads */
1401 rem
= sector_div(cylinder_times_heads
, sectors_per_track
);
1403 temp
= cylinder_times_heads
+ 1023;
1404 /* sector_div stores the quotient in temp */
1405 rem
= sector_div(temp
, 1024);
1413 if (cylinder_times_heads
>= (heads
* 1024) || (heads
> 16)) {
1414 sectors_per_track
= 31;
1417 cylinder_times_heads
= total_sectors
;
1419 * sector_div stores the quotient in
1420 * cylinder_times_heads
1422 rem
= sector_div(cylinder_times_heads
,
1426 if (cylinder_times_heads
>= (heads
* 1024)) {
1427 sectors_per_track
= 63;
1430 cylinder_times_heads
= total_sectors
;
1432 * sector_div stores the quotient in
1433 * cylinder_times_heads
1435 rem
= sector_div(cylinder_times_heads
,
1440 temp
= cylinder_times_heads
;
1441 /* sector_div stores the quotient in temp */
1442 rem
= sector_div(temp
, heads
);
1446 hg
->sectors
= sectors_per_track
;
1447 hg
->cylinders
= cylinders
;
1449 DPRINT_INFO(BLKVSC_DRV
, "CHS (%d, %d, %d)", cylinders
, heads
,
1455 static int blkvsc_ioctl(struct block_device
*bd
, fmode_t mode
,
1456 unsigned cmd
, unsigned long argument
)
1458 /* struct block_device_context *blkdev = bd->bd_disk->private_data; */
1463 * TODO: I think there is certain format for HDIO_GET_IDENTITY rather
1464 * than just a GUID. Commented it out for now.
1467 case HDIO_GET_IDENTITY
:
1468 DPRINT_INFO(BLKVSC_DRV
, "HDIO_GET_IDENTITY\n");
1469 if (copy_to_user((void __user
*)arg
, blkdev
->device_id
,
1470 blkdev
->device_id_len
))
1482 static int __init
blkvsc_init(void)
1486 ASSERT(sizeof(sector_t
) == 8); /* Make sure CONFIG_LBD is set */
1488 DPRINT_ENTER(BLKVSC_DRV
);
1490 DPRINT_INFO(BLKVSC_DRV
, "Blkvsc initializing....");
1492 ret
= blkvsc_drv_init(BlkVscInitialize
);
1494 DPRINT_EXIT(BLKVSC_DRV
);
1499 static void __exit
blkvsc_exit(void)
1501 DPRINT_ENTER(BLKVSC_DRV
);
1503 DPRINT_ENTER(BLKVSC_DRV
);
1506 MODULE_LICENSE("GPL");
1507 module_param(blkvsc_ringbuffer_size
, int, S_IRUGO
);
1508 module_init(blkvsc_init
);
1509 module_exit(blkvsc_exit
);