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 43enum 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 */ 54struct blkvsc_request_group { 55 int outstanding; 56 int status; 57 struct list_head blkvsc_req_list; /* list of blkvsc_requests */ 58}; 59 60struct 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 */ 96struct 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 */ 119struct 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 */ 126static int blkvsc_probe(struct device *dev); 127static int blkvsc_remove(struct device *device); 128static void blkvsc_shutdown(struct device *device); 129 130static int blkvsc_open(struct block_device *bdev, fmode_t mode); 131static int blkvsc_release(struct gendisk *disk, fmode_t mode); 132static int blkvsc_media_changed(struct gendisk *gd); 133static int blkvsc_revalidate_disk(struct gendisk *gd); 134static int blkvsc_getgeo(struct block_device *bd, struct hd_geometry *hg); 135static int blkvsc_ioctl(struct block_device *bd, fmode_t mode, 136 unsigned cmd, unsigned long argument); 137static void blkvsc_request(struct request_queue *queue); 138static void blkvsc_request_completion(struct hv_storvsc_request *request); 139static int blkvsc_do_request(struct block_device_context *blkdev, 140 struct request *req); 141static int blkvsc_submit_request(struct blkvsc_request *blkvsc_req, 142 void (*request_completion)(struct hv_storvsc_request *)); 143static void blkvsc_init_rw(struct blkvsc_request *blkvsc_req); 144static void blkvsc_cmd_completion(struct hv_storvsc_request *request); 145static int blkvsc_do_inquiry(struct block_device_context *blkdev); 146static int blkvsc_do_read_capacity(struct block_device_context *blkdev); 147static int blkvsc_do_read_capacity16(struct block_device_context *blkdev); 148static int blkvsc_do_flush(struct block_device_context *blkdev); 149static int blkvsc_cancel_pending_reqs(struct block_device_context *blkdev); 150static int blkvsc_do_pending_reqs(struct block_device_context *blkdev); 151 152static int blkvsc_ringbuffer_size = BLKVSC_RING_BUFFER_SIZE; 153module_param(blkvsc_ringbuffer_size, int, S_IRUGO); 154MODULE_PARM_DESC(ring_size, "Ring buffer size (in bytes)"); 155 156/* The one and only one */ 157static struct blkvsc_driver_context g_blkvsc_drv; 158 159static 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 */ 172static 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 199static 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 206static 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 *) ¤t_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 */ 244static 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 394Remove: 395 storvsc_drv_obj->Base.OnDeviceRemove(device_obj); 396 397Cleanup: 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 410static 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 444static 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) */ 485static 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 */ 568static 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 645static 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 */ 723static 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 787static 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 843static 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 */ 899static 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 1060static 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 1082static 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 1152static 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 1222out: 1223 return ret; 1224} 1225 1226static 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 1248static 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 1290static 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 1313static 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 1335static int blkvsc_media_changed(struct gendisk *gd) 1336{ 1337 DPRINT_DBG(BLKVSC_DRV, "- enter\n"); 1338 return 1; 1339} 1340 1341static 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 1356static 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 1436static 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 1455static 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 1468static void __exit blkvsc_exit(void) 1469{ 1470 blkvsc_drv_exit(); 1471} 1472 1473MODULE_LICENSE("GPL"); 1474MODULE_VERSION(HV_DRV_VERSION); 1475MODULE_DESCRIPTION("Microsoft Hyper-V virtual block driver"); 1476module_init(blkvsc_init); 1477module_exit(blkvsc_exit); 1478