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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/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>
34 #include "hv_api.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 hv_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
119 /* Static decl */
120 static DEFINE_MUTEX(blkvsc_mutex);
121 static int blkvsc_probe(struct device *dev);
122 static int blkvsc_remove(struct device *device);
123 static void blkvsc_shutdown(struct device *device);
124
125 static int blkvsc_open(struct block_device *bdev, fmode_t mode);
126 static int blkvsc_release(struct gendisk *disk, fmode_t mode);
127 static unsigned int blkvsc_check_events(struct gendisk *gd,
128 unsigned int clearing);
129 static int blkvsc_revalidate_disk(struct gendisk *gd);
130 static int blkvsc_getgeo(struct block_device *bd, struct hd_geometry *hg);
131 static int blkvsc_ioctl(struct block_device *bd, fmode_t mode,
132 unsigned cmd, unsigned long argument);
133 static void blkvsc_request(struct request_queue *queue);
134 static void blkvsc_request_completion(struct hv_storvsc_request *request);
135 static int blkvsc_do_request(struct block_device_context *blkdev,
136 struct request *req);
137 static int blkvsc_submit_request(struct blkvsc_request *blkvsc_req,
138 void (*request_completion)(struct hv_storvsc_request *));
139 static void blkvsc_init_rw(struct blkvsc_request *blkvsc_req);
140 static void blkvsc_cmd_completion(struct hv_storvsc_request *request);
141 static int blkvsc_do_inquiry(struct block_device_context *blkdev);
142 static int blkvsc_do_read_capacity(struct block_device_context *blkdev);
143 static int blkvsc_do_read_capacity16(struct block_device_context *blkdev);
144 static int blkvsc_do_flush(struct block_device_context *blkdev);
145 static int blkvsc_cancel_pending_reqs(struct block_device_context *blkdev);
146 static int blkvsc_do_pending_reqs(struct block_device_context *blkdev);
147
148 static int blkvsc_ringbuffer_size = BLKVSC_RING_BUFFER_SIZE;
149 module_param(blkvsc_ringbuffer_size, int, S_IRUGO);
150 MODULE_PARM_DESC(ring_size, "Ring buffer size (in bytes)");
151
152 /* The one and only one */
153 static struct storvsc_driver_object g_blkvsc_drv;
154
155 static const struct block_device_operations block_ops = {
156 .owner = THIS_MODULE,
157 .open = blkvsc_open,
158 .release = blkvsc_release,
159 .check_events = blkvsc_check_events,
160 .revalidate_disk = blkvsc_revalidate_disk,
161 .getgeo = blkvsc_getgeo,
162 .ioctl = blkvsc_ioctl,
163 };
164
165 /*
166 * blkvsc_drv_init - BlkVsc driver initialization.
167 */
168 static int blkvsc_drv_init(int (*drv_init)(struct hv_driver *drv))
169 {
170 struct storvsc_driver_object *storvsc_drv_obj = &g_blkvsc_drv;
171 struct hv_driver *drv = &g_blkvsc_drv.base;
172 int ret;
173
174 storvsc_drv_obj->ring_buffer_size = blkvsc_ringbuffer_size;
175
176 drv->priv = storvsc_drv_obj;
177
178 /* Callback to client driver to complete the initialization */
179 drv_init(&storvsc_drv_obj->base);
180
181 drv->driver.name = storvsc_drv_obj->base.name;
182
183 drv->driver.probe = blkvsc_probe;
184 drv->driver.remove = blkvsc_remove;
185 drv->driver.shutdown = blkvsc_shutdown;
186
187 /* The driver belongs to vmbus */
188 ret = vmbus_child_driver_register(&drv->driver);
189
190 return ret;
191 }
192
193 static int blkvsc_drv_exit_cb(struct device *dev, void *data)
194 {
195 struct device **curr = (struct device **)data;
196 *curr = dev;
197 return 1; /* stop iterating */
198 }
199
200 static void blkvsc_drv_exit(void)
201 {
202 struct storvsc_driver_object *storvsc_drv_obj = &g_blkvsc_drv;
203 struct hv_driver *drv = &g_blkvsc_drv.base;
204 struct device *current_dev;
205 int ret;
206
207 while (1) {
208 current_dev = NULL;
209
210 /* Get the device */
211 ret = driver_for_each_device(&drv->driver, NULL,
212 (void *) &current_dev,
213 blkvsc_drv_exit_cb);
214
215 if (ret)
216 DPRINT_WARN(BLKVSC_DRV,
217 "driver_for_each_device returned %d", ret);
218
219
220 if (current_dev == NULL)
221 break;
222
223 /* Initiate removal from the top-down */
224 device_unregister(current_dev);
225 }
226
227 if (storvsc_drv_obj->base.cleanup)
228 storvsc_drv_obj->base.cleanup(&storvsc_drv_obj->base);
229
230 vmbus_child_driver_unregister(&drv->driver);
231
232 return;
233 }
234
235 /*
236 * blkvsc_probe - Add a new device for this driver
237 */
238 static int blkvsc_probe(struct device *device)
239 {
240 struct hv_driver *drv =
241 drv_to_hv_drv(device->driver);
242 struct storvsc_driver_object *storvsc_drv_obj =
243 drv->priv;
244 struct hv_device *device_obj = device_to_hv_device(device);
245
246 struct block_device_context *blkdev = NULL;
247 struct storvsc_device_info device_info;
248 int major = 0;
249 int devnum = 0;
250 int ret = 0;
251 static int ide0_registered;
252 static int ide1_registered;
253
254 DPRINT_DBG(BLKVSC_DRV, "blkvsc_probe - enter");
255
256 if (!storvsc_drv_obj->base.dev_add) {
257 DPRINT_ERR(BLKVSC_DRV, "OnDeviceAdd() not set");
258 ret = -1;
259 goto Cleanup;
260 }
261
262 blkdev = kzalloc(sizeof(struct block_device_context), GFP_KERNEL);
263 if (!blkdev) {
264 ret = -ENOMEM;
265 goto Cleanup;
266 }
267
268 INIT_LIST_HEAD(&blkdev->pending_list);
269
270 /* Initialize what we can here */
271 spin_lock_init(&blkdev->lock);
272
273 /* ASSERT(sizeof(struct blkvsc_request_group) <= */
274 /* sizeof(struct blkvsc_request)); */
275
276 blkdev->request_pool = kmem_cache_create(dev_name(&device_obj->device),
277 sizeof(struct blkvsc_request) +
278 storvsc_drv_obj->request_ext_size, 0,
279 SLAB_HWCACHE_ALIGN, NULL);
280 if (!blkdev->request_pool) {
281 ret = -ENOMEM;
282 goto Cleanup;
283 }
284
285
286 /* Call to the vsc driver to add the device */
287 ret = storvsc_drv_obj->base.dev_add(device_obj, &device_info);
288 if (ret != 0) {
289 DPRINT_ERR(BLKVSC_DRV, "unable to add blkvsc device");
290 goto Cleanup;
291 }
292
293 blkdev->device_ctx = device_obj;
294 /* this identified the device 0 or 1 */
295 blkdev->target = device_info.target_id;
296 /* this identified the ide ctrl 0 or 1 */
297 blkdev->path = device_info.path_id;
298
299 dev_set_drvdata(device, blkdev);
300
301 /* Calculate the major and device num */
302 if (blkdev->path == 0) {
303 major = IDE0_MAJOR;
304 devnum = blkdev->path + blkdev->target; /* 0 or 1 */
305
306 if (!ide0_registered) {
307 ret = register_blkdev(major, "ide");
308 if (ret != 0) {
309 DPRINT_ERR(BLKVSC_DRV,
310 "register_blkdev() failed! ret %d",
311 ret);
312 goto Remove;
313 }
314
315 ide0_registered = 1;
316 }
317 } else if (blkdev->path == 1) {
318 major = IDE1_MAJOR;
319 devnum = blkdev->path + blkdev->target + 1; /* 2 or 3 */
320
321 if (!ide1_registered) {
322 ret = register_blkdev(major, "ide");
323 if (ret != 0) {
324 DPRINT_ERR(BLKVSC_DRV,
325 "register_blkdev() failed! ret %d",
326 ret);
327 goto Remove;
328 }
329
330 ide1_registered = 1;
331 }
332 } else {
333 DPRINT_ERR(BLKVSC_DRV, "invalid pathid");
334 ret = -1;
335 goto Cleanup;
336 }
337
338 DPRINT_INFO(BLKVSC_DRV, "blkvsc registered for major %d!!", major);
339
340 blkdev->gd = alloc_disk(BLKVSC_MINORS);
341 if (!blkdev->gd) {
342 DPRINT_ERR(BLKVSC_DRV, "register_blkdev() failed! ret %d", ret);
343 ret = -1;
344 goto Cleanup;
345 }
346
347 blkdev->gd->queue = blk_init_queue(blkvsc_request, &blkdev->lock);
348
349 blk_queue_max_segment_size(blkdev->gd->queue, PAGE_SIZE);
350 blk_queue_max_segments(blkdev->gd->queue, MAX_MULTIPAGE_BUFFER_COUNT);
351 blk_queue_segment_boundary(blkdev->gd->queue, PAGE_SIZE-1);
352 blk_queue_bounce_limit(blkdev->gd->queue, BLK_BOUNCE_ANY);
353 blk_queue_dma_alignment(blkdev->gd->queue, 511);
354
355 blkdev->gd->major = major;
356 if (devnum == 1 || devnum == 3)
357 blkdev->gd->first_minor = BLKVSC_MINORS;
358 else
359 blkdev->gd->first_minor = 0;
360 blkdev->gd->fops = &block_ops;
361 blkdev->gd->events = DISK_EVENT_MEDIA_CHANGE;
362 blkdev->gd->private_data = blkdev;
363 blkdev->gd->driverfs_dev = &(blkdev->device_ctx->device);
364 sprintf(blkdev->gd->disk_name, "hd%c", 'a' + devnum);
365
366 blkvsc_do_inquiry(blkdev);
367 if (blkdev->device_type == DVD_TYPE) {
368 set_disk_ro(blkdev->gd, 1);
369 blkdev->gd->flags |= GENHD_FL_REMOVABLE;
370 blkvsc_do_read_capacity(blkdev);
371 } else {
372 blkvsc_do_read_capacity16(blkdev);
373 }
374
375 set_capacity(blkdev->gd, blkdev->capacity * (blkdev->sector_size/512));
376 blk_queue_logical_block_size(blkdev->gd->queue, blkdev->sector_size);
377 /* go! */
378 add_disk(blkdev->gd);
379
380 DPRINT_INFO(BLKVSC_DRV, "%s added!! capacity %lu sector_size %d",
381 blkdev->gd->disk_name, (unsigned long)blkdev->capacity,
382 blkdev->sector_size);
383
384 return ret;
385
386 Remove:
387 storvsc_drv_obj->base.dev_rm(device_obj);
388
389 Cleanup:
390 if (blkdev) {
391 if (blkdev->request_pool) {
392 kmem_cache_destroy(blkdev->request_pool);
393 blkdev->request_pool = NULL;
394 }
395 kfree(blkdev);
396 blkdev = NULL;
397 }
398
399 return ret;
400 }
401
402 static void blkvsc_shutdown(struct device *device)
403 {
404 struct block_device_context *blkdev = dev_get_drvdata(device);
405 unsigned long flags;
406
407 if (!blkdev)
408 return;
409
410 DPRINT_DBG(BLKVSC_DRV, "blkvsc_shutdown - users %d disk %s\n",
411 blkdev->users, blkdev->gd->disk_name);
412
413 spin_lock_irqsave(&blkdev->lock, flags);
414
415 blkdev->shutting_down = 1;
416
417 blk_stop_queue(blkdev->gd->queue);
418
419 spin_unlock_irqrestore(&blkdev->lock, flags);
420
421 while (blkdev->num_outstanding_reqs) {
422 DPRINT_INFO(STORVSC, "waiting for %d requests to complete...",
423 blkdev->num_outstanding_reqs);
424 udelay(100);
425 }
426
427 blkvsc_do_flush(blkdev);
428
429 spin_lock_irqsave(&blkdev->lock, flags);
430
431 blkvsc_cancel_pending_reqs(blkdev);
432
433 spin_unlock_irqrestore(&blkdev->lock, flags);
434 }
435
436 static int blkvsc_do_flush(struct block_device_context *blkdev)
437 {
438 struct blkvsc_request *blkvsc_req;
439
440 DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_flush()\n");
441
442 if (blkdev->device_type != HARDDISK_TYPE)
443 return 0;
444
445 blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL);
446 if (!blkvsc_req)
447 return -ENOMEM;
448
449 memset(blkvsc_req, 0, sizeof(struct blkvsc_request));
450 init_waitqueue_head(&blkvsc_req->wevent);
451 blkvsc_req->dev = blkdev;
452 blkvsc_req->req = NULL;
453 blkvsc_req->write = 0;
454
455 blkvsc_req->request.data_buffer.pfn_array[0] = 0;
456 blkvsc_req->request.data_buffer.offset = 0;
457 blkvsc_req->request.data_buffer.len = 0;
458
459 blkvsc_req->cmnd[0] = SYNCHRONIZE_CACHE;
460 blkvsc_req->cmd_len = 10;
461
462 /*
463 * Set this here since the completion routine may be invoked and
464 * completed before we return
465 */
466 blkvsc_req->cond = 0;
467 blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion);
468
469 wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond);
470
471 kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
472
473 return 0;
474 }
475
476 /* Do a scsi INQUIRY cmd here to get the device type (ie disk or dvd) */
477 static int blkvsc_do_inquiry(struct block_device_context *blkdev)
478 {
479 struct blkvsc_request *blkvsc_req;
480 struct page *page_buf;
481 unsigned char *buf;
482 unsigned char device_type;
483
484 DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_inquiry()\n");
485
486 blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL);
487 if (!blkvsc_req)
488 return -ENOMEM;
489
490 memset(blkvsc_req, 0, sizeof(struct blkvsc_request));
491 page_buf = alloc_page(GFP_KERNEL);
492 if (!page_buf) {
493 kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
494 return -ENOMEM;
495 }
496
497 init_waitqueue_head(&blkvsc_req->wevent);
498 blkvsc_req->dev = blkdev;
499 blkvsc_req->req = NULL;
500 blkvsc_req->write = 0;
501
502 blkvsc_req->request.data_buffer.pfn_array[0] = page_to_pfn(page_buf);
503 blkvsc_req->request.data_buffer.offset = 0;
504 blkvsc_req->request.data_buffer.len = 64;
505
506 blkvsc_req->cmnd[0] = INQUIRY;
507 blkvsc_req->cmnd[1] = 0x1; /* Get product data */
508 blkvsc_req->cmnd[2] = 0x83; /* mode page 83 */
509 blkvsc_req->cmnd[4] = 64;
510 blkvsc_req->cmd_len = 6;
511
512 /*
513 * Set this here since the completion routine may be invoked and
514 * completed before we return
515 */
516 blkvsc_req->cond = 0;
517
518 blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion);
519
520 DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete - cond %d\n",
521 blkvsc_req, blkvsc_req->cond);
522
523 wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond);
524
525 buf = kmap(page_buf);
526
527 /* print_hex_dump_bytes("", DUMP_PREFIX_NONE, buf, 64); */
528 /* be to le */
529 device_type = buf[0] & 0x1F;
530
531 if (device_type == 0x0) {
532 blkdev->device_type = HARDDISK_TYPE;
533 } else if (device_type == 0x5) {
534 blkdev->device_type = DVD_TYPE;
535 } else {
536 /* TODO: this is currently unsupported device type */
537 blkdev->device_type = UNKNOWN_DEV_TYPE;
538 }
539
540 DPRINT_DBG(BLKVSC_DRV, "device type %d\n", device_type);
541
542 blkdev->device_id_len = buf[7];
543 if (blkdev->device_id_len > 64)
544 blkdev->device_id_len = 64;
545
546 memcpy(blkdev->device_id, &buf[8], blkdev->device_id_len);
547 /* printk_hex_dump_bytes("", DUMP_PREFIX_NONE, blkdev->device_id,
548 * blkdev->device_id_len); */
549
550 kunmap(page_buf);
551
552 __free_page(page_buf);
553
554 kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
555
556 return 0;
557 }
558
559 /* Do a scsi READ_CAPACITY cmd here to get the size of the disk */
560 static int blkvsc_do_read_capacity(struct block_device_context *blkdev)
561 {
562 struct blkvsc_request *blkvsc_req;
563 struct page *page_buf;
564 unsigned char *buf;
565 struct scsi_sense_hdr sense_hdr;
566
567 DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_read_capacity()\n");
568
569 blkdev->sector_size = 0;
570 blkdev->capacity = 0;
571 blkdev->media_not_present = 0; /* assume a disk is present */
572
573 blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL);
574 if (!blkvsc_req)
575 return -ENOMEM;
576
577 memset(blkvsc_req, 0, sizeof(struct blkvsc_request));
578 page_buf = alloc_page(GFP_KERNEL);
579 if (!page_buf) {
580 kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
581 return -ENOMEM;
582 }
583
584 init_waitqueue_head(&blkvsc_req->wevent);
585 blkvsc_req->dev = blkdev;
586 blkvsc_req->req = NULL;
587 blkvsc_req->write = 0;
588
589 blkvsc_req->request.data_buffer.pfn_array[0] = page_to_pfn(page_buf);
590 blkvsc_req->request.data_buffer.offset = 0;
591 blkvsc_req->request.data_buffer.len = 8;
592
593 blkvsc_req->cmnd[0] = READ_CAPACITY;
594 blkvsc_req->cmd_len = 16;
595
596 /*
597 * Set this here since the completion routine may be invoked
598 * and completed before we return
599 */
600 blkvsc_req->cond = 0;
601
602 blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion);
603
604 DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete - cond %d\n",
605 blkvsc_req, blkvsc_req->cond);
606
607 wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond);
608
609 /* check error */
610 if (blkvsc_req->request.status) {
611 scsi_normalize_sense(blkvsc_req->sense_buffer,
612 SCSI_SENSE_BUFFERSIZE, &sense_hdr);
613
614 if (sense_hdr.asc == 0x3A) {
615 /* Medium not present */
616 blkdev->media_not_present = 1;
617 }
618 return 0;
619 }
620 buf = kmap(page_buf);
621
622 /* be to le */
623 blkdev->capacity = ((buf[0] << 24) | (buf[1] << 16) |
624 (buf[2] << 8) | buf[3]) + 1;
625 blkdev->sector_size = (buf[4] << 24) | (buf[5] << 16) |
626 (buf[6] << 8) | buf[7];
627
628 kunmap(page_buf);
629
630 __free_page(page_buf);
631
632 kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
633
634 return 0;
635 }
636
637 static int blkvsc_do_read_capacity16(struct block_device_context *blkdev)
638 {
639 struct blkvsc_request *blkvsc_req;
640 struct page *page_buf;
641 unsigned char *buf;
642 struct scsi_sense_hdr sense_hdr;
643
644 DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_read_capacity16()\n");
645
646 blkdev->sector_size = 0;
647 blkdev->capacity = 0;
648 blkdev->media_not_present = 0; /* assume a disk is present */
649
650 blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL);
651 if (!blkvsc_req)
652 return -ENOMEM;
653
654 memset(blkvsc_req, 0, sizeof(struct blkvsc_request));
655 page_buf = alloc_page(GFP_KERNEL);
656 if (!page_buf) {
657 kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
658 return -ENOMEM;
659 }
660
661 init_waitqueue_head(&blkvsc_req->wevent);
662 blkvsc_req->dev = blkdev;
663 blkvsc_req->req = NULL;
664 blkvsc_req->write = 0;
665
666 blkvsc_req->request.data_buffer.pfn_array[0] = page_to_pfn(page_buf);
667 blkvsc_req->request.data_buffer.offset = 0;
668 blkvsc_req->request.data_buffer.len = 12;
669
670 blkvsc_req->cmnd[0] = 0x9E; /* READ_CAPACITY16; */
671 blkvsc_req->cmd_len = 16;
672
673 /*
674 * Set this here since the completion routine may be invoked
675 * and completed before we return
676 */
677 blkvsc_req->cond = 0;
678
679 blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion);
680
681 DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete - cond %d\n",
682 blkvsc_req, blkvsc_req->cond);
683
684 wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond);
685
686 /* check error */
687 if (blkvsc_req->request.status) {
688 scsi_normalize_sense(blkvsc_req->sense_buffer,
689 SCSI_SENSE_BUFFERSIZE, &sense_hdr);
690 if (sense_hdr.asc == 0x3A) {
691 /* Medium not present */
692 blkdev->media_not_present = 1;
693 }
694 return 0;
695 }
696 buf = kmap(page_buf);
697
698 /* be to le */
699 blkdev->capacity = be64_to_cpu(*(unsigned long long *) &buf[0]) + 1;
700 blkdev->sector_size = be32_to_cpu(*(unsigned int *)&buf[8]);
701
702 #if 0
703 blkdev->capacity = ((buf[0] << 24) | (buf[1] << 16) |
704 (buf[2] << 8) | buf[3]) + 1;
705 blkdev->sector_size = (buf[4] << 24) | (buf[5] << 16) |
706 (buf[6] << 8) | buf[7];
707 #endif
708
709 kunmap(page_buf);
710
711 __free_page(page_buf);
712
713 kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
714
715 return 0;
716 }
717
718 /*
719 * blkvsc_remove() - Callback when our device is removed
720 */
721 static int blkvsc_remove(struct device *device)
722 {
723 struct hv_driver *drv =
724 drv_to_hv_drv(device->driver);
725 struct storvsc_driver_object *storvsc_drv_obj =
726 drv->priv;
727 struct hv_device *device_obj = device_to_hv_device(device);
728 struct block_device_context *blkdev = dev_get_drvdata(device);
729 unsigned long flags;
730 int ret;
731
732 DPRINT_DBG(BLKVSC_DRV, "blkvsc_remove()\n");
733
734 if (!storvsc_drv_obj->base.dev_rm)
735 return -1;
736
737 /*
738 * Call to the vsc driver to let it know that the device is being
739 * removed
740 */
741 ret = storvsc_drv_obj->base.dev_rm(device_obj);
742 if (ret != 0) {
743 /* TODO: */
744 DPRINT_ERR(BLKVSC_DRV,
745 "unable to remove blkvsc device (ret %d)", ret);
746 }
747
748 /* Get to a known state */
749 spin_lock_irqsave(&blkdev->lock, flags);
750
751 blkdev->shutting_down = 1;
752
753 blk_stop_queue(blkdev->gd->queue);
754
755 spin_unlock_irqrestore(&blkdev->lock, flags);
756
757 while (blkdev->num_outstanding_reqs) {
758 DPRINT_INFO(STORVSC, "waiting for %d requests to complete...",
759 blkdev->num_outstanding_reqs);
760 udelay(100);
761 }
762
763 blkvsc_do_flush(blkdev);
764
765 spin_lock_irqsave(&blkdev->lock, flags);
766
767 blkvsc_cancel_pending_reqs(blkdev);
768
769 spin_unlock_irqrestore(&blkdev->lock, flags);
770
771 blk_cleanup_queue(blkdev->gd->queue);
772
773 del_gendisk(blkdev->gd);
774
775 kmem_cache_destroy(blkdev->request_pool);
776
777 kfree(blkdev);
778
779 return ret;
780 }
781
782 static void blkvsc_init_rw(struct blkvsc_request *blkvsc_req)
783 {
784 /* ASSERT(blkvsc_req->req); */
785 /* ASSERT(blkvsc_req->sector_count <= (MAX_MULTIPAGE_BUFFER_COUNT*8)); */
786
787 blkvsc_req->cmd_len = 16;
788
789 if (blkvsc_req->sector_start > 0xffffffff) {
790 if (rq_data_dir(blkvsc_req->req)) {
791 blkvsc_req->write = 1;
792 blkvsc_req->cmnd[0] = WRITE_16;
793 } else {
794 blkvsc_req->write = 0;
795 blkvsc_req->cmnd[0] = READ_16;
796 }
797
798 blkvsc_req->cmnd[1] |=
799 (blkvsc_req->req->cmd_flags & REQ_FUA) ? 0x8 : 0;
800
801 *(unsigned long long *)&blkvsc_req->cmnd[2] =
802 cpu_to_be64(blkvsc_req->sector_start);
803 *(unsigned int *)&blkvsc_req->cmnd[10] =
804 cpu_to_be32(blkvsc_req->sector_count);
805 } else if ((blkvsc_req->sector_count > 0xff) ||
806 (blkvsc_req->sector_start > 0x1fffff)) {
807 if (rq_data_dir(blkvsc_req->req)) {
808 blkvsc_req->write = 1;
809 blkvsc_req->cmnd[0] = WRITE_10;
810 } else {
811 blkvsc_req->write = 0;
812 blkvsc_req->cmnd[0] = READ_10;
813 }
814
815 blkvsc_req->cmnd[1] |=
816 (blkvsc_req->req->cmd_flags & REQ_FUA) ? 0x8 : 0;
817
818 *(unsigned int *)&blkvsc_req->cmnd[2] =
819 cpu_to_be32(blkvsc_req->sector_start);
820 *(unsigned short *)&blkvsc_req->cmnd[7] =
821 cpu_to_be16(blkvsc_req->sector_count);
822 } else {
823 if (rq_data_dir(blkvsc_req->req)) {
824 blkvsc_req->write = 1;
825 blkvsc_req->cmnd[0] = WRITE_6;
826 } else {
827 blkvsc_req->write = 0;
828 blkvsc_req->cmnd[0] = READ_6;
829 }
830
831 *(unsigned int *)&blkvsc_req->cmnd[1] =
832 cpu_to_be32(blkvsc_req->sector_start) >> 8;
833 blkvsc_req->cmnd[1] &= 0x1f;
834 blkvsc_req->cmnd[4] = (unsigned char)blkvsc_req->sector_count;
835 }
836 }
837
838 static int blkvsc_submit_request(struct blkvsc_request *blkvsc_req,
839 void (*request_completion)(struct hv_storvsc_request *))
840 {
841 struct block_device_context *blkdev = blkvsc_req->dev;
842 struct hv_device *device_ctx = blkdev->device_ctx;
843 struct hv_driver *drv =
844 drv_to_hv_drv(device_ctx->device.driver);
845 struct storvsc_driver_object *storvsc_drv_obj =
846 drv->priv;
847 struct hv_storvsc_request *storvsc_req;
848 int ret;
849
850 DPRINT_DBG(BLKVSC_DRV, "blkvsc_submit_request() - "
851 "req %p type %s start_sector %lu count %ld offset %d "
852 "len %d\n", blkvsc_req,
853 (blkvsc_req->write) ? "WRITE" : "READ",
854 (unsigned long) blkvsc_req->sector_start,
855 blkvsc_req->sector_count,
856 blkvsc_req->request.data_buffer.offset,
857 blkvsc_req->request.data_buffer.len);
858 #if 0
859 for (i = 0; i < (blkvsc_req->request.data_buffer.len >> 12); i++) {
860 DPRINT_DBG(BLKVSC_DRV, "blkvsc_submit_request() - "
861 "req %p pfn[%d] %llx\n",
862 blkvsc_req, i,
863 blkvsc_req->request.data_buffer.pfn_array[i]);
864 }
865 #endif
866
867 storvsc_req = &blkvsc_req->request;
868 storvsc_req->extension = (void *)((unsigned long)blkvsc_req +
869 sizeof(struct blkvsc_request));
870
871 storvsc_req->type = blkvsc_req->write ? WRITE_TYPE : READ_TYPE;
872
873 storvsc_req->on_io_completion = request_completion;
874 storvsc_req->context = blkvsc_req;
875
876 storvsc_req->host = blkdev->port;
877 storvsc_req->bus = blkdev->path;
878 storvsc_req->target_id = blkdev->target;
879 storvsc_req->lun_id = 0; /* this is not really used at all */
880
881 storvsc_req->cdb_len = blkvsc_req->cmd_len;
882 storvsc_req->cdb = blkvsc_req->cmnd;
883
884 storvsc_req->sense_buffer = blkvsc_req->sense_buffer;
885 storvsc_req->sense_buffer_size = SCSI_SENSE_BUFFERSIZE;
886
887 ret = storvsc_drv_obj->on_io_request(blkdev->device_ctx,
888 &blkvsc_req->request);
889 if (ret == 0)
890 blkdev->num_outstanding_reqs++;
891
892 return ret;
893 }
894
895 /*
896 * We break the request into 1 or more blkvsc_requests and submit
897 * them. If we can't submit them all, we put them on the
898 * pending_list. The blkvsc_request() will work on the pending_list.
899 */
900 static int blkvsc_do_request(struct block_device_context *blkdev,
901 struct request *req)
902 {
903 struct bio *bio = NULL;
904 struct bio_vec *bvec = NULL;
905 struct bio_vec *prev_bvec = NULL;
906 struct blkvsc_request *blkvsc_req = NULL;
907 struct blkvsc_request *tmp;
908 int databuf_idx = 0;
909 int seg_idx = 0;
910 sector_t start_sector;
911 unsigned long num_sectors = 0;
912 int ret = 0;
913 int pending = 0;
914 struct blkvsc_request_group *group = NULL;
915
916 DPRINT_DBG(BLKVSC_DRV, "blkdev %p req %p sect %lu\n", blkdev, req,
917 (unsigned long)blk_rq_pos(req));
918
919 /* Create a group to tie req to list of blkvsc_reqs */
920 group = kmem_cache_alloc(blkdev->request_pool, GFP_ATOMIC);
921 if (!group)
922 return -ENOMEM;
923
924 INIT_LIST_HEAD(&group->blkvsc_req_list);
925 group->outstanding = group->status = 0;
926
927 start_sector = blk_rq_pos(req);
928
929 /* foreach bio in the request */
930 if (req->bio) {
931 for (bio = req->bio; bio; bio = bio->bi_next) {
932 /*
933 * Map this bio into an existing or new storvsc request
934 */
935 bio_for_each_segment(bvec, bio, seg_idx) {
936 DPRINT_DBG(BLKVSC_DRV, "bio_for_each_segment() "
937 "- req %p bio %p bvec %p seg_idx %d "
938 "databuf_idx %d\n", req, bio, bvec,
939 seg_idx, databuf_idx);
940
941 /* Get a new storvsc request */
942 /* 1st-time */
943 if ((!blkvsc_req) ||
944 (databuf_idx >= MAX_MULTIPAGE_BUFFER_COUNT)
945 /* hole at the begin of page */
946 || (bvec->bv_offset != 0) ||
947 /* hold at the end of page */
948 (prev_bvec &&
949 (prev_bvec->bv_len != PAGE_SIZE))) {
950 /* submit the prev one */
951 if (blkvsc_req) {
952 blkvsc_req->sector_start = start_sector;
953 sector_div(blkvsc_req->sector_start, (blkdev->sector_size >> 9));
954
955 blkvsc_req->sector_count = num_sectors / (blkdev->sector_size >> 9);
956 blkvsc_init_rw(blkvsc_req);
957 }
958
959 /*
960 * Create new blkvsc_req to represent
961 * the current bvec
962 */
963 blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_ATOMIC);
964 if (!blkvsc_req) {
965 /* free up everything */
966 list_for_each_entry_safe(
967 blkvsc_req, tmp,
968 &group->blkvsc_req_list,
969 req_entry) {
970 list_del(&blkvsc_req->req_entry);
971 kmem_cache_free(blkdev->request_pool, blkvsc_req);
972 }
973
974 kmem_cache_free(blkdev->request_pool, group);
975 return -ENOMEM;
976 }
977
978 memset(blkvsc_req, 0,
979 sizeof(struct blkvsc_request));
980
981 blkvsc_req->dev = blkdev;
982 blkvsc_req->req = req;
983 blkvsc_req->request.data_buffer.offset
984 = bvec->bv_offset;
985 blkvsc_req->request.data_buffer.len
986 = 0;
987
988 /* Add to the group */
989 blkvsc_req->group = group;
990 blkvsc_req->group->outstanding++;
991 list_add_tail(&blkvsc_req->req_entry,
992 &blkvsc_req->group->blkvsc_req_list);
993
994 start_sector += num_sectors;
995 num_sectors = 0;
996 databuf_idx = 0;
997 }
998
999 /* Add the curr bvec/segment to the curr blkvsc_req */
1000 blkvsc_req->request.data_buffer.
1001 pfn_array[databuf_idx]
1002 = page_to_pfn(bvec->bv_page);
1003 blkvsc_req->request.data_buffer.len
1004 += bvec->bv_len;
1005
1006 prev_bvec = bvec;
1007
1008 databuf_idx++;
1009 num_sectors += bvec->bv_len >> 9;
1010
1011 } /* bio_for_each_segment */
1012
1013 } /* rq_for_each_bio */
1014 }
1015
1016 /* Handle the last one */
1017 if (blkvsc_req) {
1018 DPRINT_DBG(BLKVSC_DRV, "blkdev %p req %p group %p count %d\n",
1019 blkdev, req, blkvsc_req->group,
1020 blkvsc_req->group->outstanding);
1021
1022 blkvsc_req->sector_start = start_sector;
1023 sector_div(blkvsc_req->sector_start,
1024 (blkdev->sector_size >> 9));
1025
1026 blkvsc_req->sector_count = num_sectors /
1027 (blkdev->sector_size >> 9);
1028
1029 blkvsc_init_rw(blkvsc_req);
1030 }
1031
1032 list_for_each_entry(blkvsc_req, &group->blkvsc_req_list, req_entry) {
1033 if (pending) {
1034 DPRINT_DBG(BLKVSC_DRV, "adding blkvsc_req to "
1035 "pending_list - blkvsc_req %p start_sect %lu"
1036 " sect_count %ld (%lu %ld)\n", blkvsc_req,
1037 (unsigned long)blkvsc_req->sector_start,
1038 blkvsc_req->sector_count,
1039 (unsigned long)start_sector,
1040 (unsigned long)num_sectors);
1041
1042 list_add_tail(&blkvsc_req->pend_entry,
1043 &blkdev->pending_list);
1044 } else {
1045 ret = blkvsc_submit_request(blkvsc_req,
1046 blkvsc_request_completion);
1047 if (ret == -1) {
1048 pending = 1;
1049 list_add_tail(&blkvsc_req->pend_entry,
1050 &blkdev->pending_list);
1051 }
1052
1053 DPRINT_DBG(BLKVSC_DRV, "submitted blkvsc_req %p "
1054 "start_sect %lu sect_count %ld (%lu %ld) "
1055 "ret %d\n", blkvsc_req,
1056 (unsigned long)blkvsc_req->sector_start,
1057 blkvsc_req->sector_count,
1058 (unsigned long)start_sector,
1059 num_sectors, ret);
1060 }
1061 }
1062
1063 return pending;
1064 }
1065
1066 static void blkvsc_cmd_completion(struct hv_storvsc_request *request)
1067 {
1068 struct blkvsc_request *blkvsc_req =
1069 (struct blkvsc_request *)request->context;
1070 struct block_device_context *blkdev =
1071 (struct block_device_context *)blkvsc_req->dev;
1072 struct scsi_sense_hdr sense_hdr;
1073
1074 DPRINT_DBG(BLKVSC_DRV, "blkvsc_cmd_completion() - req %p\n",
1075 blkvsc_req);
1076
1077 blkdev->num_outstanding_reqs--;
1078
1079 if (blkvsc_req->request.status)
1080 if (scsi_normalize_sense(blkvsc_req->sense_buffer,
1081 SCSI_SENSE_BUFFERSIZE, &sense_hdr))
1082 scsi_print_sense_hdr("blkvsc", &sense_hdr);
1083
1084 blkvsc_req->cond = 1;
1085 wake_up_interruptible(&blkvsc_req->wevent);
1086 }
1087
1088 static void blkvsc_request_completion(struct hv_storvsc_request *request)
1089 {
1090 struct blkvsc_request *blkvsc_req =
1091 (struct blkvsc_request *)request->context;
1092 struct block_device_context *blkdev =
1093 (struct block_device_context *)blkvsc_req->dev;
1094 unsigned long flags;
1095 struct blkvsc_request *comp_req, *tmp;
1096
1097 /* ASSERT(blkvsc_req->group); */
1098
1099 DPRINT_DBG(BLKVSC_DRV, "blkdev %p blkvsc_req %p group %p type %s "
1100 "sect_start %lu sect_count %ld len %d group outstd %d "
1101 "total outstd %d\n",
1102 blkdev, blkvsc_req, blkvsc_req->group,
1103 (blkvsc_req->write) ? "WRITE" : "READ",
1104 (unsigned long)blkvsc_req->sector_start,
1105 blkvsc_req->sector_count,
1106 blkvsc_req->request.data_buffer.len,
1107 blkvsc_req->group->outstanding,
1108 blkdev->num_outstanding_reqs);
1109
1110 spin_lock_irqsave(&blkdev->lock, flags);
1111
1112 blkdev->num_outstanding_reqs--;
1113 blkvsc_req->group->outstanding--;
1114
1115 /*
1116 * Only start processing when all the blkvsc_reqs are
1117 * completed. This guarantees no out-of-order blkvsc_req
1118 * completion when calling end_that_request_first()
1119 */
1120 if (blkvsc_req->group->outstanding == 0) {
1121 list_for_each_entry_safe(comp_req, tmp,
1122 &blkvsc_req->group->blkvsc_req_list,
1123 req_entry) {
1124 DPRINT_DBG(BLKVSC_DRV, "completing blkvsc_req %p "
1125 "sect_start %lu sect_count %ld\n",
1126 comp_req,
1127 (unsigned long)comp_req->sector_start,
1128 comp_req->sector_count);
1129
1130 list_del(&comp_req->req_entry);
1131
1132 if (!__blk_end_request(comp_req->req,
1133 (!comp_req->request.status ? 0 : -EIO),
1134 comp_req->sector_count * blkdev->sector_size)) {
1135 /*
1136 * All the sectors have been xferred ie the
1137 * request is done
1138 */
1139 DPRINT_DBG(BLKVSC_DRV, "req %p COMPLETED\n",
1140 comp_req->req);
1141 kmem_cache_free(blkdev->request_pool,
1142 comp_req->group);
1143 }
1144
1145 kmem_cache_free(blkdev->request_pool, comp_req);
1146 }
1147
1148 if (!blkdev->shutting_down) {
1149 blkvsc_do_pending_reqs(blkdev);
1150 blk_start_queue(blkdev->gd->queue);
1151 blkvsc_request(blkdev->gd->queue);
1152 }
1153 }
1154
1155 spin_unlock_irqrestore(&blkdev->lock, flags);
1156 }
1157
1158 static int blkvsc_cancel_pending_reqs(struct block_device_context *blkdev)
1159 {
1160 struct blkvsc_request *pend_req, *tmp;
1161 struct blkvsc_request *comp_req, *tmp2;
1162
1163 int ret = 0;
1164
1165 DPRINT_DBG(BLKVSC_DRV, "blkvsc_cancel_pending_reqs()");
1166
1167 /* Flush the pending list first */
1168 list_for_each_entry_safe(pend_req, tmp, &blkdev->pending_list,
1169 pend_entry) {
1170 /*
1171 * The pend_req could be part of a partially completed
1172 * request. If so, complete those req first until we
1173 * hit the pend_req
1174 */
1175 list_for_each_entry_safe(comp_req, tmp2,
1176 &pend_req->group->blkvsc_req_list,
1177 req_entry) {
1178 DPRINT_DBG(BLKVSC_DRV, "completing blkvsc_req %p "
1179 "sect_start %lu sect_count %ld\n",
1180 comp_req,
1181 (unsigned long) comp_req->sector_start,
1182 comp_req->sector_count);
1183
1184 if (comp_req == pend_req)
1185 break;
1186
1187 list_del(&comp_req->req_entry);
1188
1189 if (comp_req->req) {
1190 ret = __blk_end_request(comp_req->req,
1191 (!comp_req->request.status ? 0 : -EIO),
1192 comp_req->sector_count *
1193 blkdev->sector_size);
1194
1195 /* FIXME: shouldn't this do more than return? */
1196 if (ret)
1197 goto out;
1198 }
1199
1200 kmem_cache_free(blkdev->request_pool, comp_req);
1201 }
1202
1203 DPRINT_DBG(BLKVSC_DRV, "cancelling pending request - %p\n",
1204 pend_req);
1205
1206 list_del(&pend_req->pend_entry);
1207
1208 list_del(&pend_req->req_entry);
1209
1210 if (comp_req->req) {
1211 if (!__blk_end_request(pend_req->req, -EIO,
1212 pend_req->sector_count *
1213 blkdev->sector_size)) {
1214 /*
1215 * All the sectors have been xferred ie the
1216 * request is done
1217 */
1218 DPRINT_DBG(BLKVSC_DRV,
1219 "blkvsc_cancel_pending_reqs() - "
1220 "req %p COMPLETED\n", pend_req->req);
1221 kmem_cache_free(blkdev->request_pool,
1222 pend_req->group);
1223 }
1224 }
1225
1226 kmem_cache_free(blkdev->request_pool, pend_req);
1227 }
1228
1229 out:
1230 return ret;
1231 }
1232
1233 static int blkvsc_do_pending_reqs(struct block_device_context *blkdev)
1234 {
1235 struct blkvsc_request *pend_req, *tmp;
1236 int ret = 0;
1237
1238 /* Flush the pending list first */
1239 list_for_each_entry_safe(pend_req, tmp, &blkdev->pending_list,
1240 pend_entry) {
1241 DPRINT_DBG(BLKVSC_DRV, "working off pending_list - %p\n",
1242 pend_req);
1243
1244 ret = blkvsc_submit_request(pend_req,
1245 blkvsc_request_completion);
1246 if (ret != 0)
1247 break;
1248 else
1249 list_del(&pend_req->pend_entry);
1250 }
1251
1252 return ret;
1253 }
1254
1255 static void blkvsc_request(struct request_queue *queue)
1256 {
1257 struct block_device_context *blkdev = NULL;
1258 struct request *req;
1259 int ret = 0;
1260
1261 DPRINT_DBG(BLKVSC_DRV, "- enter\n");
1262 while ((req = blk_peek_request(queue)) != NULL) {
1263 DPRINT_DBG(BLKVSC_DRV, "- req %p\n", req);
1264
1265 blkdev = req->rq_disk->private_data;
1266 if (blkdev->shutting_down || req->cmd_type != REQ_TYPE_FS ||
1267 blkdev->media_not_present) {
1268 __blk_end_request_cur(req, 0);
1269 continue;
1270 }
1271
1272 ret = blkvsc_do_pending_reqs(blkdev);
1273
1274 if (ret != 0) {
1275 DPRINT_DBG(BLKVSC_DRV,
1276 "- stop queue - pending_list not empty\n");
1277 blk_stop_queue(queue);
1278 break;
1279 }
1280
1281 blk_start_request(req);
1282
1283 ret = blkvsc_do_request(blkdev, req);
1284 if (ret > 0) {
1285 DPRINT_DBG(BLKVSC_DRV, "- stop queue - no room\n");
1286 blk_stop_queue(queue);
1287 break;
1288 } else if (ret < 0) {
1289 DPRINT_DBG(BLKVSC_DRV, "- stop queue - no mem\n");
1290 blk_requeue_request(queue, req);
1291 blk_stop_queue(queue);
1292 break;
1293 }
1294 }
1295 }
1296
1297 static int blkvsc_open(struct block_device *bdev, fmode_t mode)
1298 {
1299 struct block_device_context *blkdev = bdev->bd_disk->private_data;
1300
1301 DPRINT_DBG(BLKVSC_DRV, "- users %d disk %s\n", blkdev->users,
1302 blkdev->gd->disk_name);
1303
1304 mutex_lock(&blkvsc_mutex);
1305 spin_lock(&blkdev->lock);
1306
1307 if (!blkdev->users && blkdev->device_type == DVD_TYPE) {
1308 spin_unlock(&blkdev->lock);
1309 check_disk_change(bdev);
1310 spin_lock(&blkdev->lock);
1311 }
1312
1313 blkdev->users++;
1314
1315 spin_unlock(&blkdev->lock);
1316 mutex_unlock(&blkvsc_mutex);
1317 return 0;
1318 }
1319
1320 static int blkvsc_release(struct gendisk *disk, fmode_t mode)
1321 {
1322 struct block_device_context *blkdev = disk->private_data;
1323
1324 DPRINT_DBG(BLKVSC_DRV, "- users %d disk %s\n", blkdev->users,
1325 blkdev->gd->disk_name);
1326
1327 mutex_lock(&blkvsc_mutex);
1328 spin_lock(&blkdev->lock);
1329 if (blkdev->users == 1) {
1330 spin_unlock(&blkdev->lock);
1331 blkvsc_do_flush(blkdev);
1332 spin_lock(&blkdev->lock);
1333 }
1334
1335 blkdev->users--;
1336
1337 spin_unlock(&blkdev->lock);
1338 mutex_unlock(&blkvsc_mutex);
1339 return 0;
1340 }
1341
1342 static unsigned int blkvsc_check_events(struct gendisk *gd,
1343 unsigned int clearing)
1344 {
1345 DPRINT_DBG(BLKVSC_DRV, "- enter\n");
1346 return DISK_EVENT_MEDIA_CHANGE;
1347 }
1348
1349 static int blkvsc_revalidate_disk(struct gendisk *gd)
1350 {
1351 struct block_device_context *blkdev = gd->private_data;
1352
1353 DPRINT_DBG(BLKVSC_DRV, "- enter\n");
1354
1355 if (blkdev->device_type == DVD_TYPE) {
1356 blkvsc_do_read_capacity(blkdev);
1357 set_capacity(blkdev->gd, blkdev->capacity *
1358 (blkdev->sector_size/512));
1359 blk_queue_logical_block_size(gd->queue, blkdev->sector_size);
1360 }
1361 return 0;
1362 }
1363
1364 static int blkvsc_getgeo(struct block_device *bd, struct hd_geometry *hg)
1365 {
1366 sector_t total_sectors = get_capacity(bd->bd_disk);
1367 sector_t cylinder_times_heads = 0;
1368 sector_t temp = 0;
1369
1370 int sectors_per_track = 0;
1371 int heads = 0;
1372 int cylinders = 0;
1373 int rem = 0;
1374
1375 if (total_sectors > (65535 * 16 * 255))
1376 total_sectors = (65535 * 16 * 255);
1377
1378 if (total_sectors >= (65535 * 16 * 63)) {
1379 sectors_per_track = 255;
1380 heads = 16;
1381
1382 cylinder_times_heads = total_sectors;
1383 /* sector_div stores the quotient in cylinder_times_heads */
1384 rem = sector_div(cylinder_times_heads, sectors_per_track);
1385 } else {
1386 sectors_per_track = 17;
1387
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);
1391
1392 temp = cylinder_times_heads + 1023;
1393 /* sector_div stores the quotient in temp */
1394 rem = sector_div(temp, 1024);
1395
1396 heads = temp;
1397
1398 if (heads < 4)
1399 heads = 4;
1400
1401
1402 if (cylinder_times_heads >= (heads * 1024) || (heads > 16)) {
1403 sectors_per_track = 31;
1404 heads = 16;
1405
1406 cylinder_times_heads = total_sectors;
1407 /*
1408 * sector_div stores the quotient in
1409 * cylinder_times_heads
1410 */
1411 rem = sector_div(cylinder_times_heads,
1412 sectors_per_track);
1413 }
1414
1415 if (cylinder_times_heads >= (heads * 1024)) {
1416 sectors_per_track = 63;
1417 heads = 16;
1418
1419 cylinder_times_heads = total_sectors;
1420 /*
1421 * sector_div stores the quotient in
1422 * cylinder_times_heads
1423 */
1424 rem = sector_div(cylinder_times_heads,
1425 sectors_per_track);
1426 }
1427 }
1428
1429 temp = cylinder_times_heads;
1430 /* sector_div stores the quotient in temp */
1431 rem = sector_div(temp, heads);
1432 cylinders = temp;
1433
1434 hg->heads = heads;
1435 hg->sectors = sectors_per_track;
1436 hg->cylinders = cylinders;
1437
1438 DPRINT_INFO(BLKVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads,
1439 sectors_per_track);
1440
1441 return 0;
1442 }
1443
1444 static int blkvsc_ioctl(struct block_device *bd, fmode_t mode,
1445 unsigned cmd, unsigned long argument)
1446 {
1447 /* struct block_device_context *blkdev = bd->bd_disk->private_data; */
1448 int ret;
1449
1450 switch (cmd) {
1451 /*
1452 * TODO: I think there is certain format for HDIO_GET_IDENTITY rather
1453 * than just a GUID. Commented it out for now.
1454 */
1455 #if 0
1456 case HDIO_GET_IDENTITY:
1457 DPRINT_INFO(BLKVSC_DRV, "HDIO_GET_IDENTITY\n");
1458 if (copy_to_user((void __user *)arg, blkdev->device_id,
1459 blkdev->device_id_len))
1460 ret = -EFAULT;
1461 break;
1462 #endif
1463 default:
1464 ret = -EINVAL;
1465 break;
1466 }
1467
1468 return ret;
1469 }
1470
1471 static int __init blkvsc_init(void)
1472 {
1473 int ret;
1474
1475 BUILD_BUG_ON(sizeof(sector_t) != 8);
1476
1477 DPRINT_INFO(BLKVSC_DRV, "Blkvsc initializing....");
1478
1479 ret = blkvsc_drv_init(blk_vsc_initialize);
1480
1481 return ret;
1482 }
1483
1484 static void __exit blkvsc_exit(void)
1485 {
1486 blkvsc_drv_exit();
1487 }
1488
1489 MODULE_LICENSE("GPL");
1490 MODULE_VERSION(HV_DRV_VERSION);
1491 MODULE_DESCRIPTION("Microsoft Hyper-V virtual block driver");
1492 module_init(blkvsc_init);
1493 module_exit(blkvsc_exit);
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