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GUI: Fix Tomato RAF theme for all builds. Compilation typo.
[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / drivers / staging / hv / blkvsc_drv.c
blob7b225b962ea36fff73c1e74246627378e0077916
1 /*
2 * Copyright (c) 2009, Microsoft Corporation.
3 *
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.
7 *
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
11 * more details.
12 *
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.
16 *
17 * Authors:
18 * Haiyang Zhang <haiyangz@microsoft.com>
19 * Hank Janssen <hjanssen@microsoft.com>
20 */
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>
34 #include "osd.h"
35 #include "logging.h"
36 #include "version_info.h"
37 #include "vmbus.h"
38 #include "storvsc_api.h"
39
40
41 #define BLKVSC_MINORS 64
42
43 enum blkvsc_device_type {
44 UNKNOWN_DEV_TYPE,
45 HARDDISK_TYPE,
46 DVD_TYPE,
47 };
48
49 /*
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
53 */
54 struct blkvsc_request_group {
55 int outstanding;
56 int status;
57 struct list_head blkvsc_req_list; /* list of blkvsc_requests */
58 };
59
60 struct blkvsc_request {
61 /* blkvsc_request_group.blkvsc_req_list */
62 struct list_head req_entry;
63
64 /* block_device_context.pending_list */
65 struct list_head pend_entry;
66
67 /* This may be null if we generate a request internally */
68 struct request *req;
69
70 struct block_device_context *dev;
71
72 /* The group this request is part of. Maybe null */
73 struct blkvsc_request_group *group;
74
75 wait_queue_head_t wevent;
76 int cond;
77
78 int write;
79 sector_t sector_start;
80 unsigned long sector_count;
81
82 unsigned char sense_buffer[SCSI_SENSE_BUFFERSIZE];
83 unsigned char cmd_len;
84 unsigned char cmnd[MAX_COMMAND_SIZE];
85
86 struct hv_storvsc_request request;
87 /*
88 * !!!DO NOT ADD ANYTHING BELOW HERE!!! Otherwise, memory can overlap,
89 * because - The extension buffer falls right here and is pointed to by
90 * request.Extension;
91 * Which sounds like a horrible idea, who designed this?
92 */
93 };
94
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;
100 spinlock_t lock;
101 struct gendisk *gd;
102 enum blkvsc_device_type device_type;
103 struct list_head pending_list;
104
105 unsigned char device_id[64];
106 unsigned int device_id_len;
107 int num_outstanding_reqs;
108 int shutting_down;
109 int media_not_present;
110 unsigned int sector_size;
111 sector_t capacity;
112 unsigned int port;
113 unsigned char path;
114 unsigned char target;
115 int users;
116 };
117
118 /* Per driver */
119 struct blkvsc_driver_context {
120 /* !! These must be the first 2 fields !! */
121 struct driver_context drv_ctx;
122 struct storvsc_driver_object drv_obj;
123 };
124
125 /* Static decl */
126 static int blkvsc_probe(struct device *dev);
127 static int blkvsc_remove(struct device *device);
128 static void blkvsc_shutdown(struct device *device);
129
130 static int blkvsc_open(struct block_device *bdev, fmode_t mode);
131 static int blkvsc_release(struct gendisk *disk, fmode_t mode);
132 static int blkvsc_media_changed(struct gendisk *gd);
133 static int blkvsc_revalidate_disk(struct gendisk *gd);
134 static int blkvsc_getgeo(struct block_device *bd, struct hd_geometry *hg);
135 static int blkvsc_ioctl(struct block_device *bd, fmode_t mode,
136 unsigned cmd, unsigned long argument);
137 static void blkvsc_request(struct request_queue *queue);
138 static void blkvsc_request_completion(struct hv_storvsc_request *request);
139 static int blkvsc_do_request(struct block_device_context *blkdev,
140 struct request *req);
141 static int blkvsc_submit_request(struct blkvsc_request *blkvsc_req,
142 void (*request_completion)(struct hv_storvsc_request *));
143 static void blkvsc_init_rw(struct blkvsc_request *blkvsc_req);
144 static void blkvsc_cmd_completion(struct hv_storvsc_request *request);
145 static int blkvsc_do_inquiry(struct block_device_context *blkdev);
146 static int blkvsc_do_read_capacity(struct block_device_context *blkdev);
147 static int blkvsc_do_read_capacity16(struct block_device_context *blkdev);
148 static int blkvsc_do_flush(struct block_device_context *blkdev);
149 static int blkvsc_cancel_pending_reqs(struct block_device_context *blkdev);
150 static int blkvsc_do_pending_reqs(struct block_device_context *blkdev);
151
152 static int blkvsc_ringbuffer_size = BLKVSC_RING_BUFFER_SIZE;
153 module_param(blkvsc_ringbuffer_size, int, S_IRUGO);
154 MODULE_PARM_DESC(ring_size, "Ring buffer size (in bytes)");
155
156 /* The one and only one */
157 static struct blkvsc_driver_context g_blkvsc_drv;
158
159 static const struct block_device_operations block_ops = {
160 .owner = THIS_MODULE,
161 .open = blkvsc_open,
162 .release = blkvsc_release,
163 .media_changed = blkvsc_media_changed,
164 .revalidate_disk = blkvsc_revalidate_disk,
165 .getgeo = blkvsc_getgeo,
166 .ioctl = blkvsc_ioctl,
167 };
168
169 /*
170 * blkvsc_drv_init - BlkVsc driver initialization.
171 */
172 static int blkvsc_drv_init(int (*drv_init)(struct hv_driver *drv))
173 {
174 struct storvsc_driver_object *storvsc_drv_obj = &g_blkvsc_drv.drv_obj;
175 struct driver_context *drv_ctx = &g_blkvsc_drv.drv_ctx;
176 int ret;
177
178 vmbus_get_interface(&storvsc_drv_obj->Base.VmbusChannelInterface);
179
180 storvsc_drv_obj->RingBufferSize = blkvsc_ringbuffer_size;
181
182 /* Callback to client driver to complete the initialization */
183 drv_init(&storvsc_drv_obj->Base);
184
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));
188
189 drv_ctx->probe = blkvsc_probe;
190 drv_ctx->remove = blkvsc_remove;
191 drv_ctx->shutdown = blkvsc_shutdown;
192
193 /* The driver belongs to vmbus */
194 ret = vmbus_child_driver_register(drv_ctx);
195
196 return ret;
197 }
198
199 static int blkvsc_drv_exit_cb(struct device *dev, void *data)
200 {
201 struct device **curr = (struct device **)data;
202 *curr = dev;
203 return 1; /* stop iterating */
204 }
205
206 static void blkvsc_drv_exit(void)
207 {
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;
211 int ret;
212
213 while (1) {
214 current_dev = NULL;
215
216 /* Get the device */
217 ret = driver_for_each_device(&drv_ctx->driver, NULL,
218 (void *) &current_dev,
219 blkvsc_drv_exit_cb);
220
221 if (ret)
222 DPRINT_WARN(BLKVSC_DRV,
223 "driver_for_each_device returned %d", ret);
224
225
226 if (current_dev == NULL)
227 break;
228
229 /* Initiate removal from the top-down */
230 device_unregister(current_dev);
231 }
232
233 if (storvsc_drv_obj->Base.OnCleanup)
234 storvsc_drv_obj->Base.OnCleanup(&storvsc_drv_obj->Base);
235
236 vmbus_child_driver_unregister(drv_ctx);
237
238 return;
239 }
240
241 /*
242 * blkvsc_probe - Add a new device for this driver
243 */
244 static int blkvsc_probe(struct device *device)
245 {
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;
254
255 struct block_device_context *blkdev = NULL;
256 struct storvsc_device_info device_info;
257 int major = 0;
258 int devnum = 0;
259 int ret = 0;
260 static int ide0_registered;
261 static int ide1_registered;
262
263 DPRINT_DBG(BLKVSC_DRV, "blkvsc_probe - enter");
264
265 if (!storvsc_drv_obj->Base.OnDeviceAdd) {
266 DPRINT_ERR(BLKVSC_DRV, "OnDeviceAdd() not set");
267 ret = -1;
268 goto Cleanup;
269 }
270
271 blkdev = kzalloc(sizeof(struct block_device_context), GFP_KERNEL);
272 if (!blkdev) {
273 ret = -ENOMEM;
274 goto Cleanup;
275 }
276
277 INIT_LIST_HEAD(&blkdev->pending_list);
278
279 /* Initialize what we can here */
280 spin_lock_init(&blkdev->lock);
281
282 /* ASSERT(sizeof(struct blkvsc_request_group) <= */
283 /* sizeof(struct blkvsc_request)); */
284
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) {
290 ret = -ENOMEM;
291 goto Cleanup;
292 }
293
294
295 /* Call to the vsc driver to add the device */
296 ret = storvsc_drv_obj->Base.OnDeviceAdd(device_obj, &device_info);
297 if (ret != 0) {
298 DPRINT_ERR(BLKVSC_DRV, "unable to add blkvsc device");
299 goto Cleanup;
300 }
301
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;
307
308 dev_set_drvdata(device, blkdev);
309
310 /* Calculate the major and device num */
311 if (blkdev->path == 0) {
312 major = IDE0_MAJOR;
313 devnum = blkdev->path + blkdev->target; /* 0 or 1 */
314
315 if (!ide0_registered) {
316 ret = register_blkdev(major, "ide");
317 if (ret != 0) {
318 DPRINT_ERR(BLKVSC_DRV,
319 "register_blkdev() failed! ret %d",
320 ret);
321 goto Remove;
322 }
323
324 ide0_registered = 1;
325 }
326 } else if (blkdev->path == 1) {
327 major = IDE1_MAJOR;
328 devnum = blkdev->path + blkdev->target + 1; /* 2 or 3 */
329
330 if (!ide1_registered) {
331 ret = register_blkdev(major, "ide");
332 if (ret != 0) {
333 DPRINT_ERR(BLKVSC_DRV,
334 "register_blkdev() failed! ret %d",
335 ret);
336 goto Remove;
337 }
338
339 ide1_registered = 1;
340 }
341 } else {
342 DPRINT_ERR(BLKVSC_DRV, "invalid pathid");
343 ret = -1;
344 goto Cleanup;
345 }
346
347 DPRINT_INFO(BLKVSC_DRV, "blkvsc registered for major %d!!", major);
348
349 blkdev->gd = alloc_disk(BLKVSC_MINORS);
350 if (!blkdev->gd) {
351 DPRINT_ERR(BLKVSC_DRV, "register_blkdev() failed! ret %d", ret);
352 ret = -1;
353 goto Cleanup;
354 }
355
356 blkdev->gd->queue = blk_init_queue(blkvsc_request, &blkdev->lock);
357
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);
363
364 blkdev->gd->major = major;
365 if (devnum == 1 || devnum == 3)
366 blkdev->gd->first_minor = BLKVSC_MINORS;
367 else
368 blkdev->gd->first_minor = 0;
369 blkdev->gd->fops = &block_ops;
370 blkdev->gd->private_data = blkdev;
371 blkdev->gd->driverfs_dev = &(blkdev->device_ctx->device);
372 sprintf(blkdev->gd->disk_name, "hd%c", 'a' + devnum);
373
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);
379 } else {
380 blkvsc_do_read_capacity16(blkdev);
381 }
382
383 set_capacity(blkdev->gd, blkdev->capacity * (blkdev->sector_size/512));
384 blk_queue_logical_block_size(blkdev->gd->queue, blkdev->sector_size);
385 /* go! */
386 add_disk(blkdev->gd);
387
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);
391
392 return ret;
393
394 Remove:
395 storvsc_drv_obj->Base.OnDeviceRemove(device_obj);
396
397 Cleanup:
398 if (blkdev) {
399 if (blkdev->request_pool) {
400 kmem_cache_destroy(blkdev->request_pool);
401 blkdev->request_pool = NULL;
402 }
403 kfree(blkdev);
404 blkdev = NULL;
405 }
406
407 return ret;
408 }
409
410 static void blkvsc_shutdown(struct device *device)
411 {
412 struct block_device_context *blkdev = dev_get_drvdata(device);
413 unsigned long flags;
414
415 if (!blkdev)
416 return;
417
418 DPRINT_DBG(BLKVSC_DRV, "blkvsc_shutdown - users %d disk %s\n",
419 blkdev->users, blkdev->gd->disk_name);
420
421 spin_lock_irqsave(&blkdev->lock, flags);
422
423 blkdev->shutting_down = 1;
424
425 blk_stop_queue(blkdev->gd->queue);
426
427 spin_unlock_irqrestore(&blkdev->lock, flags);
428
429 while (blkdev->num_outstanding_reqs) {
430 DPRINT_INFO(STORVSC, "waiting for %d requests to complete...",
431 blkdev->num_outstanding_reqs);
432 udelay(100);
433 }
434
435 blkvsc_do_flush(blkdev);
436
437 spin_lock_irqsave(&blkdev->lock, flags);
438
439 blkvsc_cancel_pending_reqs(blkdev);
440
441 spin_unlock_irqrestore(&blkdev->lock, flags);
442 }
443
444 static int blkvsc_do_flush(struct block_device_context *blkdev)
445 {
446 struct blkvsc_request *blkvsc_req;
447
448 DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_flush()\n");
449
450 if (blkdev->device_type != HARDDISK_TYPE)
451 return 0;
452
453 blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL);
454 if (!blkvsc_req)
455 return -ENOMEM;
456
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;
462
463 blkvsc_req->request.DataBuffer.PfnArray[0] = 0;
464 blkvsc_req->request.DataBuffer.Offset = 0;
465 blkvsc_req->request.DataBuffer.Length = 0;
466
467 blkvsc_req->cmnd[0] = SYNCHRONIZE_CACHE;
468 blkvsc_req->cmd_len = 10;
469
470 /*
471 * Set this here since the completion routine may be invoked and
472 * completed before we return
473 */
474 blkvsc_req->cond = 0;
475 blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion);
476
477 wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond);
478
479 kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
480
481 return 0;
482 }
483
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)
486 {
487 struct blkvsc_request *blkvsc_req;
488 struct page *page_buf;
489 unsigned char *buf;
490 unsigned char device_type;
491
492 DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_inquiry()\n");
493
494 blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL);
495 if (!blkvsc_req)
496 return -ENOMEM;
497
498 memset(blkvsc_req, 0, sizeof(struct blkvsc_request));
499 page_buf = alloc_page(GFP_KERNEL);
500 if (!page_buf) {
501 kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
502 return -ENOMEM;
503 }
504
505 init_waitqueue_head(&blkvsc_req->wevent);
506 blkvsc_req->dev = blkdev;
507 blkvsc_req->req = NULL;
508 blkvsc_req->write = 0;
509
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;
513
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;
519
520 /*
521 * Set this here since the completion routine may be invoked and
522 * completed before we return
523 */
524 blkvsc_req->cond = 0;
525
526 blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion);
527
528 DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete - cond %d\n",
529 blkvsc_req, blkvsc_req->cond);
530
531 wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond);
532
533 buf = kmap(page_buf);
534
535 /* print_hex_dump_bytes("", DUMP_PREFIX_NONE, buf, 64); */
536 /* be to le */
537 device_type = buf[0] & 0x1F;
538
539 if (device_type == 0x0) {
540 blkdev->device_type = HARDDISK_TYPE;
541 } else if (device_type == 0x5) {
542 blkdev->device_type = DVD_TYPE;
543 } else {
544 /* TODO: this is currently unsupported device type */
545 blkdev->device_type = UNKNOWN_DEV_TYPE;
546 }
547
548 DPRINT_DBG(BLKVSC_DRV, "device type %d\n", device_type);
549
550 blkdev->device_id_len = buf[7];
551 if (blkdev->device_id_len > 64)
552 blkdev->device_id_len = 64;
553
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); */
557
558 kunmap(page_buf);
559
560 __free_page(page_buf);
561
562 kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
563
564 return 0;
565 }
566
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)
569 {
570 struct blkvsc_request *blkvsc_req;
571 struct page *page_buf;
572 unsigned char *buf;
573 struct scsi_sense_hdr sense_hdr;
574
575 DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_read_capacity()\n");
576
577 blkdev->sector_size = 0;
578 blkdev->capacity = 0;
579 blkdev->media_not_present = 0; /* assume a disk is present */
580
581 blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL);
582 if (!blkvsc_req)
583 return -ENOMEM;
584
585 memset(blkvsc_req, 0, sizeof(struct blkvsc_request));
586 page_buf = alloc_page(GFP_KERNEL);
587 if (!page_buf) {
588 kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
589 return -ENOMEM;
590 }
591
592 init_waitqueue_head(&blkvsc_req->wevent);
593 blkvsc_req->dev = blkdev;
594 blkvsc_req->req = NULL;
595 blkvsc_req->write = 0;
596
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;
600
601 blkvsc_req->cmnd[0] = READ_CAPACITY;
602 blkvsc_req->cmd_len = 16;
603
604 /*
605 * Set this here since the completion routine may be invoked
606 * and completed before we return
607 */
608 blkvsc_req->cond = 0;
609
610 blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion);
611
612 DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete - cond %d\n",
613 blkvsc_req, blkvsc_req->cond);
614
615 wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond);
616
617 /* check error */
618 if (blkvsc_req->request.Status) {
619 scsi_normalize_sense(blkvsc_req->sense_buffer,
620 SCSI_SENSE_BUFFERSIZE, &sense_hdr);
621
622 if (sense_hdr.asc == 0x3A) {
623 /* Medium not present */
624 blkdev->media_not_present = 1;
625 }
626 return 0;
627 }
628 buf = kmap(page_buf);
629
630 /* be to le */
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];
635
636 kunmap(page_buf);
637
638 __free_page(page_buf);
639
640 kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
641
642 return 0;
643 }
644
645 static int blkvsc_do_read_capacity16(struct block_device_context *blkdev)
646 {
647 struct blkvsc_request *blkvsc_req;
648 struct page *page_buf;
649 unsigned char *buf;
650 struct scsi_sense_hdr sense_hdr;
651
652 DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_read_capacity16()\n");
653
654 blkdev->sector_size = 0;
655 blkdev->capacity = 0;
656 blkdev->media_not_present = 0; /* assume a disk is present */
657
658 blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL);
659 if (!blkvsc_req)
660 return -ENOMEM;
661
662 memset(blkvsc_req, 0, sizeof(struct blkvsc_request));
663 page_buf = alloc_page(GFP_KERNEL);
664 if (!page_buf) {
665 kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
666 return -ENOMEM;
667 }
668
669 init_waitqueue_head(&blkvsc_req->wevent);
670 blkvsc_req->dev = blkdev;
671 blkvsc_req->req = NULL;
672 blkvsc_req->write = 0;
673
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;
677
678 blkvsc_req->cmnd[0] = 0x9E; /* READ_CAPACITY16; */
679 blkvsc_req->cmd_len = 16;
680
681 /*
682 * Set this here since the completion routine may be invoked
683 * and completed before we return
684 */
685 blkvsc_req->cond = 0;
686
687 blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion);
688
689 DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete - cond %d\n",
690 blkvsc_req, blkvsc_req->cond);
691
692 wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond);
693
694 /* check error */
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;
701 }
702 return 0;
703 }
704 buf = kmap(page_buf);
705
706 /* be to le */
707 blkdev->capacity = be64_to_cpu(*(unsigned long long *) &buf[0]) + 1;
708 blkdev->sector_size = be32_to_cpu(*(unsigned int *)&buf[8]);
709
710
711 kunmap(page_buf);
712
713 __free_page(page_buf);
714
715 kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
716
717 return 0;
718 }
719
720 /*
721 * blkvsc_remove() - Callback when our device is removed
722 */
723 static int blkvsc_remove(struct device *device)
724 {
725 struct driver_context *driver_ctx =
726 driver_to_driver_context(device->driver);
727 struct blkvsc_driver_context *blkvsc_drv_ctx =
728 (struct blkvsc_driver_context *)driver_ctx;
729 struct storvsc_driver_object *storvsc_drv_obj =
730 &blkvsc_drv_ctx->drv_obj;
731 struct vm_device *device_ctx = device_to_vm_device(device);
732 struct hv_device *device_obj = &device_ctx->device_obj;
733 struct block_device_context *blkdev = dev_get_drvdata(device);
734 unsigned long flags;
735 int ret;
736
737 DPRINT_DBG(BLKVSC_DRV, "blkvsc_remove()\n");
738
739 if (!storvsc_drv_obj->Base.OnDeviceRemove)
740 return -1;
741
742 /*
743 * Call to the vsc driver to let it know that the device is being
744 * removed
745 */
746 ret = storvsc_drv_obj->Base.OnDeviceRemove(device_obj);
747 if (ret != 0) {
748 /* TODO: */
749 DPRINT_ERR(BLKVSC_DRV,
750 "unable to remove blkvsc device (ret %d)", ret);
751 }
752
753 /* Get to a known state */
754 spin_lock_irqsave(&blkdev->lock, flags);
755
756 blkdev->shutting_down = 1;
757
758 blk_stop_queue(blkdev->gd->queue);
759
760 spin_unlock_irqrestore(&blkdev->lock, flags);
761
762 while (blkdev->num_outstanding_reqs) {
763 DPRINT_INFO(STORVSC, "waiting for %d requests to complete...",
764 blkdev->num_outstanding_reqs);
765 udelay(100);
766 }
767
768 blkvsc_do_flush(blkdev);
769
770 spin_lock_irqsave(&blkdev->lock, flags);
771
772 blkvsc_cancel_pending_reqs(blkdev);
773
774 spin_unlock_irqrestore(&blkdev->lock, flags);
775
776 blk_cleanup_queue(blkdev->gd->queue);
777
778 del_gendisk(blkdev->gd);
779
780 kmem_cache_destroy(blkdev->request_pool);
781
782 kfree(blkdev);
783
784 return ret;
785 }
786
787 static void blkvsc_init_rw(struct blkvsc_request *blkvsc_req)
788 {
789 /* ASSERT(blkvsc_req->req); */
790 /* ASSERT(blkvsc_req->sector_count <= (MAX_MULTIPAGE_BUFFER_COUNT*8)); */
791
792 blkvsc_req->cmd_len = 16;
793
794 if (blkvsc_req->sector_start > 0xffffffff) {
795 if (rq_data_dir(blkvsc_req->req)) {
796 blkvsc_req->write = 1;
797 blkvsc_req->cmnd[0] = WRITE_16;
798 } else {
799 blkvsc_req->write = 0;
800 blkvsc_req->cmnd[0] = READ_16;
801 }
802
803 blkvsc_req->cmnd[1] |=
804 (blkvsc_req->req->cmd_flags & REQ_FUA) ? 0x8 : 0;
805
806 *(unsigned long long *)&blkvsc_req->cmnd[2] =
807 cpu_to_be64(blkvsc_req->sector_start);
808 *(unsigned int *)&blkvsc_req->cmnd[10] =
809 cpu_to_be32(blkvsc_req->sector_count);
810 } else if ((blkvsc_req->sector_count > 0xff) ||
811 (blkvsc_req->sector_start > 0x1fffff)) {
812 if (rq_data_dir(blkvsc_req->req)) {
813 blkvsc_req->write = 1;
814 blkvsc_req->cmnd[0] = WRITE_10;
815 } else {
816 blkvsc_req->write = 0;
817 blkvsc_req->cmnd[0] = READ_10;
818 }
819
820 blkvsc_req->cmnd[1] |=
821 (blkvsc_req->req->cmd_flags & REQ_FUA) ? 0x8 : 0;
822
823 *(unsigned int *)&blkvsc_req->cmnd[2] =
824 cpu_to_be32(blkvsc_req->sector_start);
825 *(unsigned short *)&blkvsc_req->cmnd[7] =
826 cpu_to_be16(blkvsc_req->sector_count);
827 } else {
828 if (rq_data_dir(blkvsc_req->req)) {
829 blkvsc_req->write = 1;
830 blkvsc_req->cmnd[0] = WRITE_6;
831 } else {
832 blkvsc_req->write = 0;
833 blkvsc_req->cmnd[0] = READ_6;
834 }
835
836 *(unsigned int *)&blkvsc_req->cmnd[1] =
837 cpu_to_be32(blkvsc_req->sector_start) >> 8;
838 blkvsc_req->cmnd[1] &= 0x1f;
839 blkvsc_req->cmnd[4] = (unsigned char)blkvsc_req->sector_count;
840 }
841 }
842
843 static int blkvsc_submit_request(struct blkvsc_request *blkvsc_req,
844 void (*request_completion)(struct hv_storvsc_request *))
845 {
846 struct block_device_context *blkdev = blkvsc_req->dev;
847 struct vm_device *device_ctx = blkdev->device_ctx;
848 struct driver_context *driver_ctx =
849 driver_to_driver_context(device_ctx->device.driver);
850 struct blkvsc_driver_context *blkvsc_drv_ctx =
851 (struct blkvsc_driver_context *)driver_ctx;
852 struct storvsc_driver_object *storvsc_drv_obj =
853 &blkvsc_drv_ctx->drv_obj;
854 struct hv_storvsc_request *storvsc_req;
855 int ret;
856
857 DPRINT_DBG(BLKVSC_DRV, "blkvsc_submit_request() - "
858 "req %p type %s start_sector %lu count %ld offset %d "
859 "len %d\n", blkvsc_req,
860 (blkvsc_req->write) ? "WRITE" : "READ",
861 (unsigned long) blkvsc_req->sector_start,
862 blkvsc_req->sector_count,
863 blkvsc_req->request.DataBuffer.Offset,
864 blkvsc_req->request.DataBuffer.Length);
865
866 storvsc_req = &blkvsc_req->request;
867 storvsc_req->Extension = (void *)((unsigned long)blkvsc_req +
868 sizeof(struct blkvsc_request));
869
870 storvsc_req->Type = blkvsc_req->write ? WRITE_TYPE : READ_TYPE;
871
872 storvsc_req->OnIOCompletion = request_completion;
873 storvsc_req->Context = blkvsc_req;
874
875 storvsc_req->Host = blkdev->port;
876 storvsc_req->Bus = blkdev->path;
877 storvsc_req->TargetId = blkdev->target;
878 storvsc_req->LunId = 0; /* this is not really used at all */
879
880 storvsc_req->CdbLen = blkvsc_req->cmd_len;
881 storvsc_req->Cdb = blkvsc_req->cmnd;
882
883 storvsc_req->SenseBuffer = blkvsc_req->sense_buffer;
884 storvsc_req->SenseBufferSize = SCSI_SENSE_BUFFERSIZE;
885
886 ret = storvsc_drv_obj->OnIORequest(&blkdev->device_ctx->device_obj,
887 &blkvsc_req->request);
888 if (ret == 0)
889 blkdev->num_outstanding_reqs++;
890
891 return ret;
892 }
893
894 /*
895 * We break the request into 1 or more blkvsc_requests and submit
896 * them. If we cant submit them all, we put them on the
897 * pending_list. The blkvsc_request() will work on the pending_list.
898 */
899 static int blkvsc_do_request(struct block_device_context *blkdev,
900 struct request *req)
901 {
902 struct bio *bio = NULL;
903 struct bio_vec *bvec = NULL;
904 struct bio_vec *prev_bvec = NULL;
905 struct blkvsc_request *blkvsc_req = NULL;
906 struct blkvsc_request *tmp;
907 int databuf_idx = 0;
908 int seg_idx = 0;
909 sector_t start_sector;
910 unsigned long num_sectors = 0;
911 int ret = 0;
912 int pending = 0;
913 struct blkvsc_request_group *group = NULL;
914
915 DPRINT_DBG(BLKVSC_DRV, "blkdev %p req %p sect %lu\n", blkdev, req,
916 (unsigned long)blk_rq_pos(req));
917
918 /* Create a group to tie req to list of blkvsc_reqs */
919 group = kmem_cache_alloc(blkdev->request_pool, GFP_ATOMIC);
920 if (!group)
921 return -ENOMEM;
922
923 INIT_LIST_HEAD(&group->blkvsc_req_list);
924 group->outstanding = group->status = 0;
925
926 start_sector = blk_rq_pos(req);
927
928 /* foreach bio in the request */
929 if (req->bio) {
930 for (bio = req->bio; bio; bio = bio->bi_next) {
931 /*
932 * Map this bio into an existing or new storvsc request
933 */
934 bio_for_each_segment(bvec, bio, seg_idx) {
935 DPRINT_DBG(BLKVSC_DRV, "bio_for_each_segment() "
936 "- req %p bio %p bvec %p seg_idx %d "
937 "databuf_idx %d\n", req, bio, bvec,
938 seg_idx, databuf_idx);
939
940 /* Get a new storvsc request */
941 /* 1st-time */
942 if ((!blkvsc_req) ||
943 (databuf_idx >= MAX_MULTIPAGE_BUFFER_COUNT)
944 /* hole at the begin of page */
945 || (bvec->bv_offset != 0) ||
946 /* hold at the end of page */
947 (prev_bvec &&
948 (prev_bvec->bv_len != PAGE_SIZE))) {
949 /* submit the prev one */
950 if (blkvsc_req) {
951 blkvsc_req->sector_start = start_sector;
952 sector_div(blkvsc_req->sector_start, (blkdev->sector_size >> 9));
953
954 blkvsc_req->sector_count = num_sectors / (blkdev->sector_size >> 9);
955 blkvsc_init_rw(blkvsc_req);
956 }
957
958 /*
959 * Create new blkvsc_req to represent
960 * the current bvec
961 */
962 blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_ATOMIC);
963 if (!blkvsc_req) {
964 /* free up everything */
965 list_for_each_entry_safe(
966 blkvsc_req, tmp,
967 &group->blkvsc_req_list,
968 req_entry) {
969 list_del(&blkvsc_req->req_entry);
970 kmem_cache_free(blkdev->request_pool, blkvsc_req);
971 }
972
973 kmem_cache_free(blkdev->request_pool, group);
974 return -ENOMEM;
975 }
976
977 memset(blkvsc_req, 0,
978 sizeof(struct blkvsc_request));
979
980 blkvsc_req->dev = blkdev;
981 blkvsc_req->req = req;
982 blkvsc_req->request.DataBuffer.Offset = bvec->bv_offset;
983 blkvsc_req->request.DataBuffer.Length = 0;
984
985 /* Add to the group */
986 blkvsc_req->group = group;
987 blkvsc_req->group->outstanding++;
988 list_add_tail(&blkvsc_req->req_entry,
989 &blkvsc_req->group->blkvsc_req_list);
990
991 start_sector += num_sectors;
992 num_sectors = 0;
993 databuf_idx = 0;
994 }
995
996 /* Add the curr bvec/segment to the curr blkvsc_req */
997 blkvsc_req->request.DataBuffer.PfnArray[databuf_idx] = page_to_pfn(bvec->bv_page);
998 blkvsc_req->request.DataBuffer.Length += bvec->bv_len;
999
1000 prev_bvec = bvec;
1001
1002 databuf_idx++;
1003 num_sectors += bvec->bv_len >> 9;
1004
1005 } /* bio_for_each_segment */
1006
1007 } /* rq_for_each_bio */
1008 }
1009
1010 /* Handle the last one */
1011 if (blkvsc_req) {
1012 DPRINT_DBG(BLKVSC_DRV, "blkdev %p req %p group %p count %d\n",
1013 blkdev, req, blkvsc_req->group,
1014 blkvsc_req->group->outstanding);
1015
1016 blkvsc_req->sector_start = start_sector;
1017 sector_div(blkvsc_req->sector_start,
1018 (blkdev->sector_size >> 9));
1019
1020 blkvsc_req->sector_count = num_sectors /
1021 (blkdev->sector_size >> 9);
1022
1023 blkvsc_init_rw(blkvsc_req);
1024 }
1025
1026 list_for_each_entry(blkvsc_req, &group->blkvsc_req_list, req_entry) {
1027 if (pending) {
1028 DPRINT_DBG(BLKVSC_DRV, "adding blkvsc_req to "
1029 "pending_list - blkvsc_req %p start_sect %lu"
1030 " sect_count %ld (%lu %ld)\n", blkvsc_req,
1031 (unsigned long)blkvsc_req->sector_start,
1032 blkvsc_req->sector_count,
1033 (unsigned long)start_sector,
1034 (unsigned long)num_sectors);
1035
1036 list_add_tail(&blkvsc_req->pend_entry,
1037 &blkdev->pending_list);
1038 } else {
1039 ret = blkvsc_submit_request(blkvsc_req,
1040 blkvsc_request_completion);
1041 if (ret == -1) {
1042 pending = 1;
1043 list_add_tail(&blkvsc_req->pend_entry,
1044 &blkdev->pending_list);
1045 }
1046
1047 DPRINT_DBG(BLKVSC_DRV, "submitted blkvsc_req %p "
1048 "start_sect %lu sect_count %ld (%lu %ld) "
1049 "ret %d\n", blkvsc_req,
1050 (unsigned long)blkvsc_req->sector_start,
1051 blkvsc_req->sector_count,
1052 (unsigned long)start_sector,
1053 num_sectors, ret);
1054 }
1055 }
1056
1057 return pending;
1058 }
1059
1060 static void blkvsc_cmd_completion(struct hv_storvsc_request *request)
1061 {
1062 struct blkvsc_request *blkvsc_req =
1063 (struct blkvsc_request *)request->Context;
1064 struct block_device_context *blkdev =
1065 (struct block_device_context *)blkvsc_req->dev;
1066 struct scsi_sense_hdr sense_hdr;
1067
1068 DPRINT_DBG(BLKVSC_DRV, "blkvsc_cmd_completion() - req %p\n",
1069 blkvsc_req);
1070
1071 blkdev->num_outstanding_reqs--;
1072
1073 if (blkvsc_req->request.Status)
1074 if (scsi_normalize_sense(blkvsc_req->sense_buffer,
1075 SCSI_SENSE_BUFFERSIZE, &sense_hdr))
1076 scsi_print_sense_hdr("blkvsc", &sense_hdr);
1077
1078 blkvsc_req->cond = 1;
1079 wake_up_interruptible(&blkvsc_req->wevent);
1080 }
1081
1082 static void blkvsc_request_completion(struct hv_storvsc_request *request)
1083 {
1084 struct blkvsc_request *blkvsc_req =
1085 (struct blkvsc_request *)request->Context;
1086 struct block_device_context *blkdev =
1087 (struct block_device_context *)blkvsc_req->dev;
1088 unsigned long flags;
1089 struct blkvsc_request *comp_req, *tmp;
1090
1091 /* ASSERT(blkvsc_req->group); */
1092
1093 DPRINT_DBG(BLKVSC_DRV, "blkdev %p blkvsc_req %p group %p type %s "
1094 "sect_start %lu sect_count %ld len %d group outstd %d "
1095 "total outstd %d\n",
1096 blkdev, blkvsc_req, blkvsc_req->group,
1097 (blkvsc_req->write) ? "WRITE" : "READ",
1098 (unsigned long)blkvsc_req->sector_start,
1099 blkvsc_req->sector_count,
1100 blkvsc_req->request.DataBuffer.Length,
1101 blkvsc_req->group->outstanding,
1102 blkdev->num_outstanding_reqs);
1103
1104 spin_lock_irqsave(&blkdev->lock, flags);
1105
1106 blkdev->num_outstanding_reqs--;
1107 blkvsc_req->group->outstanding--;
1108
1109 /*
1110 * Only start processing when all the blkvsc_reqs are
1111 * completed. This guarantees no out-of-order blkvsc_req
1112 * completion when calling end_that_request_first()
1113 */
1114 if (blkvsc_req->group->outstanding == 0) {
1115 list_for_each_entry_safe(comp_req, tmp,
1116 &blkvsc_req->group->blkvsc_req_list,
1117 req_entry) {
1118 DPRINT_DBG(BLKVSC_DRV, "completing blkvsc_req %p "
1119 "sect_start %lu sect_count %ld\n",
1120 comp_req,
1121 (unsigned long)comp_req->sector_start,
1122 comp_req->sector_count);
1123
1124 list_del(&comp_req->req_entry);
1125
1126 if (!__blk_end_request(comp_req->req,
1127 (!comp_req->request.Status ? 0 : -EIO),
1128 comp_req->sector_count * blkdev->sector_size)) {
1129 /*
1130 * All the sectors have been xferred ie the
1131 * request is done
1132 */
1133 DPRINT_DBG(BLKVSC_DRV, "req %p COMPLETED\n",
1134 comp_req->req);
1135 kmem_cache_free(blkdev->request_pool,
1136 comp_req->group);
1137 }
1138
1139 kmem_cache_free(blkdev->request_pool, comp_req);
1140 }
1141
1142 if (!blkdev->shutting_down) {
1143 blkvsc_do_pending_reqs(blkdev);
1144 blk_start_queue(blkdev->gd->queue);
1145 blkvsc_request(blkdev->gd->queue);
1146 }
1147 }
1148
1149 spin_unlock_irqrestore(&blkdev->lock, flags);
1150 }
1151
1152 static int blkvsc_cancel_pending_reqs(struct block_device_context *blkdev)
1153 {
1154 struct blkvsc_request *pend_req, *tmp;
1155 struct blkvsc_request *comp_req, *tmp2;
1156
1157 int ret = 0;
1158
1159 DPRINT_DBG(BLKVSC_DRV, "blkvsc_cancel_pending_reqs()");
1160
1161 /* Flush the pending list first */
1162 list_for_each_entry_safe(pend_req, tmp, &blkdev->pending_list,
1163 pend_entry) {
1164 /*
1165 * The pend_req could be part of a partially completed
1166 * request. If so, complete those req first until we
1167 * hit the pend_req
1168 */
1169 list_for_each_entry_safe(comp_req, tmp2,
1170 &pend_req->group->blkvsc_req_list,
1171 req_entry) {
1172 DPRINT_DBG(BLKVSC_DRV, "completing blkvsc_req %p "
1173 "sect_start %lu sect_count %ld\n",
1174 comp_req,
1175 (unsigned long) comp_req->sector_start,
1176 comp_req->sector_count);
1177
1178 if (comp_req == pend_req)
1179 break;
1180
1181 list_del(&comp_req->req_entry);
1182
1183 if (comp_req->req) {
1184 ret = __blk_end_request(comp_req->req,
1185 (!comp_req->request.Status ? 0 : -EIO),
1186 comp_req->sector_count *
1187 blkdev->sector_size);
1188
1189 if (ret)
1190 goto out;
1191 }
1192
1193 kmem_cache_free(blkdev->request_pool, comp_req);
1194 }
1195
1196 DPRINT_DBG(BLKVSC_DRV, "cancelling pending request - %p\n",
1197 pend_req);
1198
1199 list_del(&pend_req->pend_entry);
1200
1201 list_del(&pend_req->req_entry);
1202
1203 if (comp_req->req) {
1204 if (!__blk_end_request(pend_req->req, -EIO,
1205 pend_req->sector_count *
1206 blkdev->sector_size)) {
1207 /*
1208 * All the sectors have been xferred ie the
1209 * request is done
1210 */
1211 DPRINT_DBG(BLKVSC_DRV,
1212 "blkvsc_cancel_pending_reqs() - "
1213 "req %p COMPLETED\n", pend_req->req);
1214 kmem_cache_free(blkdev->request_pool,
1215 pend_req->group);
1216 }
1217 }
1218
1219 kmem_cache_free(blkdev->request_pool, pend_req);
1220 }
1221
1222 out:
1223 return ret;
1224 }
1225
1226 static int blkvsc_do_pending_reqs(struct block_device_context *blkdev)
1227 {
1228 struct blkvsc_request *pend_req, *tmp;
1229 int ret = 0;
1230
1231 /* Flush the pending list first */
1232 list_for_each_entry_safe(pend_req, tmp, &blkdev->pending_list,
1233 pend_entry) {
1234 DPRINT_DBG(BLKVSC_DRV, "working off pending_list - %p\n",
1235 pend_req);
1236
1237 ret = blkvsc_submit_request(pend_req,
1238 blkvsc_request_completion);
1239 if (ret != 0)
1240 break;
1241 else
1242 list_del(&pend_req->pend_entry);
1243 }
1244
1245 return ret;
1246 }
1247
1248 static void blkvsc_request(struct request_queue *queue)
1249 {
1250 struct block_device_context *blkdev = NULL;
1251 struct request *req;
1252 int ret = 0;
1253
1254 DPRINT_DBG(BLKVSC_DRV, "- enter\n");
1255 while ((req = blk_peek_request(queue)) != NULL) {
1256 DPRINT_DBG(BLKVSC_DRV, "- req %p\n", req);
1257
1258 blkdev = req->rq_disk->private_data;
1259 if (blkdev->shutting_down || req->cmd_type != REQ_TYPE_FS ||
1260 blkdev->media_not_present) {
1261 __blk_end_request_cur(req, 0);
1262 continue;
1263 }
1264
1265 ret = blkvsc_do_pending_reqs(blkdev);
1266
1267 if (ret != 0) {
1268 DPRINT_DBG(BLKVSC_DRV,
1269 "- stop queue - pending_list not empty\n");
1270 blk_stop_queue(queue);
1271 break;
1272 }
1273
1274 blk_start_request(req);
1275
1276 ret = blkvsc_do_request(blkdev, req);
1277 if (ret > 0) {
1278 DPRINT_DBG(BLKVSC_DRV, "- stop queue - no room\n");
1279 blk_stop_queue(queue);
1280 break;
1281 } else if (ret < 0) {
1282 DPRINT_DBG(BLKVSC_DRV, "- stop queue - no mem\n");
1283 blk_requeue_request(queue, req);
1284 blk_stop_queue(queue);
1285 break;
1286 }
1287 }
1288 }
1289
1290 static int blkvsc_open(struct block_device *bdev, fmode_t mode)
1291 {
1292 struct block_device_context *blkdev = bdev->bd_disk->private_data;
1293
1294 DPRINT_DBG(BLKVSC_DRV, "- users %d disk %s\n", blkdev->users,
1295 blkdev->gd->disk_name);
1296
1297 lock_kernel();
1298 spin_lock(&blkdev->lock);
1299
1300 if (!blkdev->users && blkdev->device_type == DVD_TYPE) {
1301 spin_unlock(&blkdev->lock);
1302 check_disk_change(bdev);
1303 spin_lock(&blkdev->lock);
1304 }
1305
1306 blkdev->users++;
1307
1308 spin_unlock(&blkdev->lock);
1309 unlock_kernel();
1310 return 0;
1311 }
1312
1313 static int blkvsc_release(struct gendisk *disk, fmode_t mode)
1314 {
1315 struct block_device_context *blkdev = disk->private_data;
1316
1317 DPRINT_DBG(BLKVSC_DRV, "- users %d disk %s\n", blkdev->users,
1318 blkdev->gd->disk_name);
1319
1320 lock_kernel();
1321 spin_lock(&blkdev->lock);
1322 if (blkdev->users == 1) {
1323 spin_unlock(&blkdev->lock);
1324 blkvsc_do_flush(blkdev);
1325 spin_lock(&blkdev->lock);
1326 }
1327
1328 blkdev->users--;
1329
1330 spin_unlock(&blkdev->lock);
1331 unlock_kernel();
1332 return 0;
1333 }
1334
1335 static int blkvsc_media_changed(struct gendisk *gd)
1336 {
1337 DPRINT_DBG(BLKVSC_DRV, "- enter\n");
1338 return 1;
1339 }
1340
1341 static int blkvsc_revalidate_disk(struct gendisk *gd)
1342 {
1343 struct block_device_context *blkdev = gd->private_data;
1344
1345 DPRINT_DBG(BLKVSC_DRV, "- enter\n");
1346
1347 if (blkdev->device_type == DVD_TYPE) {
1348 blkvsc_do_read_capacity(blkdev);
1349 set_capacity(blkdev->gd, blkdev->capacity *
1350 (blkdev->sector_size/512));
1351 blk_queue_logical_block_size(gd->queue, blkdev->sector_size);
1352 }
1353 return 0;
1354 }
1355
1356 static int blkvsc_getgeo(struct block_device *bd, struct hd_geometry *hg)
1357 {
1358 sector_t total_sectors = get_capacity(bd->bd_disk);
1359 sector_t cylinder_times_heads = 0;
1360 sector_t temp = 0;
1361
1362 int sectors_per_track = 0;
1363 int heads = 0;
1364 int cylinders = 0;
1365 int rem = 0;
1366
1367 if (total_sectors > (65535 * 16 * 255))
1368 total_sectors = (65535 * 16 * 255);
1369
1370 if (total_sectors >= (65535 * 16 * 63)) {
1371 sectors_per_track = 255;
1372 heads = 16;
1373
1374 cylinder_times_heads = total_sectors;
1375 /* sector_div stores the quotient in cylinder_times_heads */
1376 rem = sector_div(cylinder_times_heads, sectors_per_track);
1377 } else {
1378 sectors_per_track = 17;
1379
1380 cylinder_times_heads = total_sectors;
1381 /* sector_div stores the quotient in cylinder_times_heads */
1382 rem = sector_div(cylinder_times_heads, sectors_per_track);
1383
1384 temp = cylinder_times_heads + 1023;
1385 /* sector_div stores the quotient in temp */
1386 rem = sector_div(temp, 1024);
1387
1388 heads = temp;
1389
1390 if (heads < 4)
1391 heads = 4;
1392
1393
1394 if (cylinder_times_heads >= (heads * 1024) || (heads > 16)) {
1395 sectors_per_track = 31;
1396 heads = 16;
1397
1398 cylinder_times_heads = total_sectors;
1399 /*
1400 * sector_div stores the quotient in
1401 * cylinder_times_heads
1402 */
1403 rem = sector_div(cylinder_times_heads,
1404 sectors_per_track);
1405 }
1406
1407 if (cylinder_times_heads >= (heads * 1024)) {
1408 sectors_per_track = 63;
1409 heads = 16;
1410
1411 cylinder_times_heads = total_sectors;
1412 /*
1413 * sector_div stores the quotient in
1414 * cylinder_times_heads
1415 */
1416 rem = sector_div(cylinder_times_heads,
1417 sectors_per_track);
1418 }
1419 }
1420
1421 temp = cylinder_times_heads;
1422 /* sector_div stores the quotient in temp */
1423 rem = sector_div(temp, heads);
1424 cylinders = temp;
1425
1426 hg->heads = heads;
1427 hg->sectors = sectors_per_track;
1428 hg->cylinders = cylinders;
1429
1430 DPRINT_INFO(BLKVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads,
1431 sectors_per_track);
1432
1433 return 0;
1434 }
1435
1436 static int blkvsc_ioctl(struct block_device *bd, fmode_t mode,
1437 unsigned cmd, unsigned long argument)
1438 {
1439 /* struct block_device_context *blkdev = bd->bd_disk->private_data; */
1440 int ret;
1441
1442 switch (cmd) {
1443 /*
1444 * TODO: I think there is certain format for HDIO_GET_IDENTITY rather
1445 * than just a GUID. Commented it out for now.
1446 */
1447 default:
1448 ret = -EINVAL;
1449 break;
1450 }
1451
1452 return ret;
1453 }
1454
1455 static int __init blkvsc_init(void)
1456 {
1457 int ret;
1458
1459 BUILD_BUG_ON(sizeof(sector_t) != 8);
1460
1461 DPRINT_INFO(BLKVSC_DRV, "Blkvsc initializing....");
1462
1463 ret = blkvsc_drv_init(BlkVscInitialize);
1464
1465 return ret;
1466 }
1467
1468 static void __exit blkvsc_exit(void)
1469 {
1470 blkvsc_drv_exit();
1471 }
1472
1473 MODULE_LICENSE("GPL");
1474 MODULE_VERSION(HV_DRV_VERSION);
1475 MODULE_DESCRIPTION("Microsoft Hyper-V virtual block driver");
1476 module_init(blkvsc_init);
1477 module_exit(blkvsc_exit);
Tomato firmware and modifications.