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Commit | Line | Data |
---|---|---|
2cb7cef9 BS |
1 | From 582e26118ab754a3bca9b98351cb874f22b76ffd Mon Sep 17 00:00:00 2001 |
2 | From: Hank Janssen <hjanssen@microsoft.com> | |
3 | Date: Mon, 13 Jul 2009 15:33:02 -0700 | |
4 | Subject: Staging: hv: add the Hyper-V virtual block driver | |
5 | ||
6 | From: Hank Janssen <hjanssen@microsoft.com> | |
7 | ||
8 | This is the virtual block driver when running Linux on top of Hyper-V. | |
9 | ||
10 | Signed-off-by: Hank Janssen <hjanssen@microsoft.com> | |
11 | Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com> | |
12 | Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> | |
13 | --- | |
14 | drivers/staging/hv/BlkVsc.c | 107 ++ | |
15 | drivers/staging/hv/blkvsc_drv.c | 1547 ++++++++++++++++++++++++++++++++++++++++ | |
16 | 2 files changed, 1654 insertions(+) | |
17 | create mode 100644 drivers/staging/hv/blkvsc.c | |
18 | ||
19 | --- /dev/null | |
20 | +++ b/drivers/staging/hv/BlkVsc.c | |
21 | @@ -0,0 +1,107 @@ | |
22 | +/* | |
23 | + * | |
24 | + * Copyright (c) 2009, Microsoft Corporation. | |
25 | + * | |
26 | + * This program is free software; you can redistribute it and/or modify it | |
27 | + * under the terms and conditions of the GNU General Public License, | |
28 | + * version 2, as published by the Free Software Foundation. | |
29 | + * | |
30 | + * This program is distributed in the hope it will be useful, but WITHOUT | |
31 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
32 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
33 | + * more details. | |
34 | + * | |
35 | + * You should have received a copy of the GNU General Public License along with | |
36 | + * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
37 | + * Place - Suite 330, Boston, MA 02111-1307 USA. | |
38 | + * | |
39 | + * Authors: | |
40 | + * Hank Janssen <hjanssen@microsoft.com> | |
41 | + * | |
42 | + */ | |
43 | + | |
44 | + | |
45 | +#include "../storvsc/StorVsc.c" | |
46 | + | |
47 | +static const char* gBlkDriverName="blkvsc"; | |
48 | + | |
49 | +//{32412632-86cb-44a2-9b5c-50d1417354f5} | |
50 | +static const GUID gBlkVscDeviceType={ | |
51 | + .Data = {0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44, 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5} | |
52 | +}; | |
53 | + | |
54 | +// Static routines | |
55 | +static int | |
56 | +BlkVscOnDeviceAdd( | |
57 | + DEVICE_OBJECT *Device, | |
58 | + void *AdditionalInfo | |
59 | + ); | |
60 | + | |
61 | + | |
62 | +int | |
63 | +BlkVscInitialize( | |
64 | + DRIVER_OBJECT *Driver | |
65 | + ) | |
66 | +{ | |
67 | + STORVSC_DRIVER_OBJECT* storDriver = (STORVSC_DRIVER_OBJECT*)Driver; | |
68 | + int ret=0; | |
69 | + | |
70 | + DPRINT_ENTER(BLKVSC); | |
71 | + | |
72 | + // Make sure we are at least 2 pages since 1 page is used for control | |
73 | + ASSERT(storDriver->RingBufferSize >= (PAGE_SIZE << 1)); | |
74 | + | |
75 | + Driver->name = gBlkDriverName; | |
76 | + memcpy(&Driver->deviceType, &gBlkVscDeviceType, sizeof(GUID)); | |
77 | + | |
78 | + storDriver->RequestExtSize = sizeof(STORVSC_REQUEST_EXTENSION); | |
79 | + // Divide the ring buffer data size (which is 1 page less than the ring buffer size since that page is reserved for the ring buffer indices) | |
80 | + // by the max request size (which is VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER + VSTOR_PACKET + UINT64) | |
81 | + storDriver->MaxOutstandingRequestsPerChannel = | |
82 | + ((storDriver->RingBufferSize - PAGE_SIZE) / ALIGN_UP(MAX_MULTIPAGE_BUFFER_PACKET + sizeof(VSTOR_PACKET) + sizeof(UINT64),sizeof(UINT64))); | |
83 | + | |
84 | + DPRINT_INFO(BLKVSC, "max io outstd %u", storDriver->MaxOutstandingRequestsPerChannel); | |
85 | + | |
86 | + // Setup the dispatch table | |
87 | + storDriver->Base.OnDeviceAdd = BlkVscOnDeviceAdd; | |
88 | + storDriver->Base.OnDeviceRemove = StorVscOnDeviceRemove; | |
89 | + storDriver->Base.OnCleanup = StorVscOnCleanup; | |
90 | + | |
91 | + storDriver->OnIORequest = StorVscOnIORequest; | |
92 | + | |
93 | + DPRINT_EXIT(BLKVSC); | |
94 | + | |
95 | + return ret; | |
96 | +} | |
97 | + | |
98 | +int | |
99 | +BlkVscOnDeviceAdd( | |
100 | + DEVICE_OBJECT *Device, | |
101 | + void *AdditionalInfo | |
102 | + ) | |
103 | +{ | |
104 | + int ret=0; | |
105 | + STORVSC_DEVICE_INFO *deviceInfo = (STORVSC_DEVICE_INFO*)AdditionalInfo; | |
106 | + | |
107 | + DPRINT_ENTER(BLKVSC); | |
108 | + | |
109 | + ret = StorVscOnDeviceAdd(Device, AdditionalInfo); | |
110 | + | |
111 | + if (ret != 0) | |
112 | + { | |
113 | + DPRINT_EXIT(BLKVSC); | |
114 | + | |
115 | + return ret; | |
116 | + } | |
117 | + | |
118 | + // We need to use the device instance guid to set the path and target id. For IDE devices, the | |
119 | + // device instance id is formatted as <bus id> - <device id> - 8899 - 000000000000. | |
120 | + deviceInfo->PathId = Device->deviceInstance.Data[3] << 24 | Device->deviceInstance.Data[2] << 16 | | |
121 | + Device->deviceInstance.Data[1] << 8 |Device->deviceInstance.Data[0]; | |
122 | + | |
123 | + deviceInfo->TargetId = Device->deviceInstance.Data[5] << 8 | Device->deviceInstance.Data[4]; | |
124 | + | |
125 | + DPRINT_EXIT(BLKVSC); | |
126 | + | |
127 | + return ret; | |
128 | +} | |
129 | --- /dev/null | |
130 | +++ b/drivers/staging/hv/blkvsc_drv.c | |
131 | @@ -0,0 +1,1547 @@ | |
132 | +/* | |
133 | + * | |
134 | + * Copyright (c) 2009, Microsoft Corporation. | |
135 | + * | |
136 | + * This program is free software; you can redistribute it and/or modify it | |
137 | + * under the terms and conditions of the GNU General Public License, | |
138 | + * version 2, as published by the Free Software Foundation. | |
139 | + * | |
140 | + * This program is distributed in the hope it will be useful, but WITHOUT | |
141 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
142 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
143 | + * more details. | |
144 | + * | |
145 | + * You should have received a copy of the GNU General Public License along with | |
146 | + * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
147 | + * Place - Suite 330, Boston, MA 02111-1307 USA. | |
148 | + * | |
149 | + * Authors: | |
150 | + * Hank Janssen <hjanssen@microsoft.com> | |
151 | + * | |
152 | + */ | |
153 | + | |
154 | + | |
155 | +#include <linux/init.h> | |
156 | +#include <linux/module.h> | |
157 | +#include <linux/device.h> | |
158 | +#include <linux/blkdev.h> | |
159 | +#include <linux/major.h> | |
160 | +#include <linux/delay.h> | |
161 | +#include <linux/hdreg.h> | |
162 | + | |
163 | +#include <scsi/scsi.h> | |
164 | +#include <scsi/scsi_cmnd.h> | |
165 | +#include <scsi/scsi_eh.h> | |
166 | +#include <scsi/scsi_dbg.h> | |
167 | + | |
168 | +#include "logging.h" | |
169 | +#include "vmbus.h" | |
170 | + | |
171 | +#include "StorVscApi.h" | |
172 | + | |
173 | +// | |
174 | +// #defines | |
175 | +// | |
176 | +#define BLKVSC_MINORS 64 | |
177 | + | |
178 | +// | |
179 | +// Data types | |
180 | +// | |
181 | +enum blkvsc_device_type { | |
182 | + UNKNOWN_DEV_TYPE, | |
183 | + HARDDISK_TYPE, | |
184 | + DVD_TYPE, | |
185 | +}; | |
186 | + | |
187 | +// This request ties the struct request and struct blkvsc_request/STORVSC_REQUEST together | |
188 | +// A struct request may be represented by 1 or more struct blkvsc_request | |
189 | +struct blkvsc_request_group { | |
190 | + int outstanding; | |
191 | + int status; | |
192 | + | |
193 | + struct list_head blkvsc_req_list; // list of blkvsc_requests | |
194 | +}; | |
195 | + | |
196 | + | |
197 | +struct blkvsc_request { | |
198 | + struct list_head req_entry; // blkvsc_request_group.blkvsc_req_list | |
199 | + | |
200 | + struct list_head pend_entry; // block_device_context.pending_list | |
201 | + | |
202 | + struct request *req; // This may be null if we generate a request internally | |
203 | + struct block_device_context *dev; | |
204 | + struct blkvsc_request_group *group; // The group this request is part of. Maybe null | |
205 | + | |
206 | + wait_queue_head_t wevent; | |
207 | + int cond; | |
208 | + | |
209 | + int write; | |
210 | + sector_t sector_start; | |
211 | + unsigned long sector_count; | |
212 | + | |
213 | + unsigned char sense_buffer[SCSI_SENSE_BUFFERSIZE]; | |
214 | + unsigned char cmd_len; | |
215 | + unsigned char cmnd[MAX_COMMAND_SIZE]; | |
216 | + | |
217 | + STORVSC_REQUEST request; | |
218 | + // !!!DO NOT ADD ANYTHING BELOW HERE!!! Otherwise, memory can overlap, because - | |
219 | + // The extension buffer falls right here and is pointed to by request.Extension; | |
220 | +}; | |
221 | + | |
222 | +// Per device structure | |
223 | +struct block_device_context { | |
224 | + struct device_context *device_ctx; // point back to our device context | |
225 | + struct kmem_cache *request_pool; | |
226 | + spinlock_t lock; | |
227 | + struct gendisk *gd; | |
228 | + enum blkvsc_device_type device_type; | |
229 | + struct list_head pending_list; | |
230 | + | |
231 | + unsigned char device_id[64]; | |
232 | + unsigned int device_id_len; | |
233 | + int num_outstanding_reqs; | |
234 | + int shutting_down; | |
235 | + int media_not_present; | |
236 | + unsigned int sector_size; | |
237 | + sector_t capacity; | |
238 | + unsigned int port; | |
239 | + unsigned char path; | |
240 | + unsigned char target; | |
241 | + int users; | |
242 | +}; | |
243 | + | |
244 | +// Per driver | |
245 | +struct blkvsc_driver_context { | |
246 | + // !! These must be the first 2 fields !! | |
247 | + struct driver_context drv_ctx; | |
248 | + STORVSC_DRIVER_OBJECT drv_obj; | |
249 | +}; | |
250 | + | |
251 | +// Static decl | |
252 | +static int blkvsc_probe(struct device *dev); | |
253 | +static int blkvsc_remove(struct device *device); | |
254 | +static void blkvsc_shutdown(struct device *device); | |
255 | + | |
256 | +static int blkvsc_open(struct inode *inode, struct file *filep); | |
257 | +static int blkvsc_release(struct inode *inode, struct file *filep); | |
258 | +static int blkvsc_media_changed(struct gendisk *gd); | |
259 | +static int blkvsc_revalidate_disk(struct gendisk *gd); | |
260 | +static int blkvsc_getgeo(struct block_device *bd, struct hd_geometry *hg); | |
261 | +static int blkvsc_ioctl(struct inode *inode, struct file *filep, unsigned cmd, unsigned long arg); | |
262 | + | |
263 | +static void blkvsc_request(struct request_queue *queue); | |
264 | +static void blkvsc_request_completion(STORVSC_REQUEST* request); | |
265 | +static int blkvsc_do_request(struct block_device_context *blkdev, struct request *req); | |
266 | +static int blkvsc_submit_request(struct blkvsc_request *blkvsc_req, void (*request_completion)(STORVSC_REQUEST*) ); | |
267 | +static void blkvsc_init_rw(struct blkvsc_request *blkvsc_req); | |
268 | +static void blkvsc_cmd_completion(STORVSC_REQUEST* request); | |
269 | +static int blkvsc_do_inquiry(struct block_device_context *blkdev); | |
270 | +static int blkvsc_do_read_capacity(struct block_device_context *blkdev); | |
271 | +static int blkvsc_do_read_capacity16(struct block_device_context *blkdev); | |
272 | +static int blkvsc_do_flush(struct block_device_context *blkdev); | |
273 | +static int blkvsc_cancel_pending_reqs(struct block_device_context *blkdev); | |
274 | +static int blkvsc_do_pending_reqs(struct block_device_context *blkdev); | |
275 | + | |
276 | + | |
277 | +static int blkvsc_ringbuffer_size = BLKVSC_RING_BUFFER_SIZE; | |
278 | + | |
279 | +// The one and only one | |
280 | +static struct blkvsc_driver_context g_blkvsc_drv; | |
281 | + | |
282 | + | |
283 | +static struct block_device_operations block_ops = | |
284 | +{ | |
285 | + .owner = THIS_MODULE, | |
286 | + .open = blkvsc_open, | |
287 | + .release = blkvsc_release, | |
288 | + .media_changed = blkvsc_media_changed, | |
289 | + .revalidate_disk = blkvsc_revalidate_disk, | |
290 | + .getgeo = blkvsc_getgeo, | |
291 | + .ioctl = blkvsc_ioctl, | |
292 | +}; | |
293 | + | |
294 | +/*++ | |
295 | + | |
296 | +Name: blkvsc_drv_init() | |
297 | + | |
298 | +Desc: BlkVsc driver initialization. | |
299 | + | |
300 | +--*/ | |
301 | +int blkvsc_drv_init(PFN_DRIVERINITIALIZE pfn_drv_init) | |
302 | +{ | |
303 | + int ret=0; | |
304 | + STORVSC_DRIVER_OBJECT *storvsc_drv_obj=&g_blkvsc_drv.drv_obj; | |
305 | + struct driver_context *drv_ctx=&g_blkvsc_drv.drv_ctx; | |
306 | + | |
307 | + DPRINT_ENTER(BLKVSC_DRV); | |
308 | + | |
309 | + vmbus_get_interface(&storvsc_drv_obj->Base.VmbusChannelInterface); | |
310 | + | |
311 | + storvsc_drv_obj->RingBufferSize = blkvsc_ringbuffer_size; | |
312 | + | |
313 | + // Callback to client driver to complete the initialization | |
314 | + pfn_drv_init(&storvsc_drv_obj->Base); | |
315 | + | |
316 | + drv_ctx->driver.name = storvsc_drv_obj->Base.name; | |
317 | + memcpy(&drv_ctx->class_id, &storvsc_drv_obj->Base.deviceType, sizeof(GUID)); | |
318 | + | |
319 | +#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9) | |
320 | + drv_ctx->driver.probe = blkvsc_probe; | |
321 | + drv_ctx->driver.remove = blkvsc_remove; | |
322 | +#else | |
323 | + drv_ctx->probe = blkvsc_probe; | |
324 | + drv_ctx->remove = blkvsc_remove; | |
325 | + drv_ctx->shutdown = blkvsc_shutdown; | |
326 | +#endif | |
327 | + | |
328 | + // The driver belongs to vmbus | |
329 | + vmbus_child_driver_register(drv_ctx); | |
330 | + | |
331 | + DPRINT_EXIT(BLKVSC_DRV); | |
332 | + | |
333 | + return ret; | |
334 | +} | |
335 | + | |
336 | + | |
337 | +static int blkvsc_drv_exit_cb(struct device *dev, void *data) | |
338 | +{ | |
339 | + struct device **curr = (struct device **)data; | |
340 | + *curr = dev; | |
341 | + return 1; // stop iterating | |
342 | +} | |
343 | + | |
344 | +/*++ | |
345 | + | |
346 | +Name: blkvsc_drv_exit() | |
347 | + | |
348 | +Desc: | |
349 | + | |
350 | +--*/ | |
351 | +void blkvsc_drv_exit(void) | |
352 | +{ | |
353 | + STORVSC_DRIVER_OBJECT *storvsc_drv_obj=&g_blkvsc_drv.drv_obj; | |
354 | + struct driver_context *drv_ctx=&g_blkvsc_drv.drv_ctx; | |
355 | + | |
356 | + struct device *current_dev=NULL; | |
357 | + | |
358 | +#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9) | |
359 | +#define driver_for_each_device(drv, start, data, fn) \ | |
360 | + struct list_head *ptr, *n; \ | |
361 | + list_for_each_safe(ptr, n, &((drv)->devices)) {\ | |
362 | + struct device *curr_dev;\ | |
363 | + curr_dev = list_entry(ptr, struct device, driver_list);\ | |
364 | + fn(curr_dev, data);\ | |
365 | + } | |
366 | +#endif // KERNEL_2_6_9 | |
367 | + | |
368 | + DPRINT_ENTER(BLKVSC_DRV); | |
369 | + | |
370 | + while (1) | |
371 | + { | |
372 | + current_dev = NULL; | |
373 | + | |
374 | + // Get the device | |
375 | + driver_for_each_device(&drv_ctx->driver, NULL, (void*)¤t_dev, blkvsc_drv_exit_cb); | |
376 | + | |
377 | + if (current_dev == NULL) | |
378 | + break; | |
379 | + | |
380 | + // Initiate removal from the top-down | |
381 | + device_unregister(current_dev); | |
382 | + } | |
383 | + | |
384 | + if (storvsc_drv_obj->Base.OnCleanup) | |
385 | + storvsc_drv_obj->Base.OnCleanup(&storvsc_drv_obj->Base); | |
386 | + | |
387 | + vmbus_child_driver_unregister(drv_ctx); | |
388 | + | |
389 | + DPRINT_EXIT(BLKVSC_DRV); | |
390 | + | |
391 | + return; | |
392 | +} | |
393 | + | |
394 | +/*++ | |
395 | + | |
396 | +Name: blkvsc_probe() | |
397 | + | |
398 | +Desc: Add a new device for this driver | |
399 | + | |
400 | +--*/ | |
401 | +static int blkvsc_probe(struct device *device) | |
402 | +{ | |
403 | + int ret=0; | |
404 | + | |
405 | + struct driver_context *driver_ctx = driver_to_driver_context(device->driver); | |
406 | + struct blkvsc_driver_context *blkvsc_drv_ctx = (struct blkvsc_driver_context*)driver_ctx; | |
407 | + STORVSC_DRIVER_OBJECT* storvsc_drv_obj = &blkvsc_drv_ctx->drv_obj; | |
408 | + | |
409 | + struct device_context *device_ctx = device_to_device_context(device); | |
410 | + DEVICE_OBJECT* device_obj = &device_ctx->device_obj; | |
411 | + | |
412 | + struct block_device_context *blkdev=NULL; | |
413 | + STORVSC_DEVICE_INFO device_info; | |
414 | + int major=0; | |
415 | + int devnum=0; | |
416 | + | |
417 | + static int ide0_registered=0; | |
418 | + static int ide1_registered=0; | |
419 | + | |
420 | + DPRINT_ENTER(BLKVSC_DRV); | |
421 | + | |
422 | + DPRINT_DBG(BLKVSC_DRV, "blkvsc_probe - enter"); | |
423 | + | |
424 | + if (!storvsc_drv_obj->Base.OnDeviceAdd) | |
425 | + { | |
426 | + DPRINT_ERR(BLKVSC_DRV, "OnDeviceAdd() not set"); | |
427 | + | |
428 | + ret = -1; | |
429 | + goto Cleanup; | |
430 | + } | |
431 | + | |
432 | + blkdev = kzalloc(sizeof(struct block_device_context), GFP_KERNEL); | |
433 | + if (!blkdev) | |
434 | + { | |
435 | + ret = -ENOMEM; | |
436 | + goto Cleanup; | |
437 | + } | |
438 | + | |
439 | + INIT_LIST_HEAD(&blkdev->pending_list); | |
440 | + | |
441 | + // Initialize what we can here | |
442 | + spin_lock_init(&blkdev->lock); | |
443 | + | |
444 | + ASSERT(sizeof(struct blkvsc_request_group) <= sizeof(struct blkvsc_request)); | |
445 | + | |
446 | +#ifdef KERNEL_2_6_27 | |
447 | + blkdev->request_pool = kmem_cache_create(device_ctx->device.bus_id, | |
448 | + sizeof(struct blkvsc_request) + storvsc_drv_obj->RequestExtSize, 0, | |
449 | + SLAB_HWCACHE_ALIGN, NULL); | |
450 | +#else | |
451 | + blkdev->request_pool = kmem_cache_create(device_ctx->device.bus_id, | |
452 | + sizeof(struct blkvsc_request) + storvsc_drv_obj->RequestExtSize, 0, | |
453 | + SLAB_HWCACHE_ALIGN, NULL, NULL); | |
454 | +#endif | |
455 | + if (!blkdev->request_pool) | |
456 | + { | |
457 | + ret = -ENOMEM; | |
458 | + goto Cleanup; | |
459 | + } | |
460 | + | |
461 | + | |
462 | + // Call to the vsc driver to add the device | |
463 | + ret = storvsc_drv_obj->Base.OnDeviceAdd(device_obj, &device_info); | |
464 | + if (ret != 0) | |
465 | + { | |
466 | + DPRINT_ERR(BLKVSC_DRV, "unable to add blkvsc device"); | |
467 | + goto Cleanup; | |
468 | + } | |
469 | + | |
470 | + blkdev->device_ctx = device_ctx; | |
471 | + blkdev->target = device_info.TargetId; // this identified the device 0 or 1 | |
472 | + blkdev->path = device_info.PathId; // this identified the ide ctrl 0 or 1 | |
473 | + | |
474 | + device->driver_data = blkdev; | |
475 | + | |
476 | + // Calculate the major and device num | |
477 | + if (blkdev->path == 0) | |
478 | + { | |
479 | + major = IDE0_MAJOR; | |
480 | + devnum = blkdev->path + blkdev->target; // 0 or 1 | |
481 | + | |
482 | + if (!ide0_registered) | |
483 | + { | |
484 | + ret = register_blkdev(major, "ide"); | |
485 | + if (ret != 0) | |
486 | + { | |
487 | + DPRINT_ERR(BLKVSC_DRV, "register_blkdev() failed! ret %d", ret); | |
488 | + goto Remove; | |
489 | + } | |
490 | + | |
491 | + ide0_registered = 1; | |
492 | + } | |
493 | + } | |
494 | + else if (blkdev->path == 1) | |
495 | + { | |
496 | + major = IDE1_MAJOR; | |
497 | + devnum = blkdev->path + blkdev->target + 1; // 2 or 3 | |
498 | + | |
499 | + if (!ide1_registered) | |
500 | + { | |
501 | + ret = register_blkdev(major, "ide"); | |
502 | + if (ret != 0) | |
503 | + { | |
504 | + DPRINT_ERR(BLKVSC_DRV, "register_blkdev() failed! ret %d", ret); | |
505 | + goto Remove; | |
506 | + } | |
507 | + | |
508 | + ide1_registered = 1; | |
509 | + } | |
510 | + | |
511 | + } | |
512 | + else | |
513 | + { | |
514 | + DPRINT_ERR(BLKVSC_DRV, "invalid pathid"); | |
515 | + ret = -1; | |
516 | + goto Cleanup; | |
517 | + } | |
518 | + | |
519 | + DPRINT_INFO(BLKVSC_DRV, "blkvsc registered for major %d!!", major); | |
520 | + | |
521 | + blkdev->gd = alloc_disk(BLKVSC_MINORS); | |
522 | + if (!blkdev->gd) | |
523 | + { | |
524 | + DPRINT_ERR(BLKVSC_DRV, "register_blkdev() failed! ret %d", ret); | |
525 | + ret = -1; | |
526 | + goto Cleanup; | |
527 | + } | |
528 | + | |
529 | + blkdev->gd->queue = blk_init_queue(blkvsc_request, &blkdev->lock); | |
530 | + | |
531 | + blk_queue_max_segment_size(blkdev->gd->queue, PAGE_SIZE); | |
532 | + blk_queue_max_phys_segments(blkdev->gd->queue, MAX_MULTIPAGE_BUFFER_COUNT); | |
533 | + blk_queue_max_hw_segments(blkdev->gd->queue, MAX_MULTIPAGE_BUFFER_COUNT); | |
534 | + blk_queue_segment_boundary(blkdev->gd->queue, PAGE_SIZE-1); | |
535 | + blk_queue_bounce_limit(blkdev->gd->queue, BLK_BOUNCE_ANY); | |
536 | + blk_queue_dma_alignment(blkdev->gd->queue, 511); | |
537 | + | |
538 | + blkdev->gd->major = major; | |
539 | + if (devnum == 1 || devnum == 3) | |
540 | + blkdev->gd->first_minor = BLKVSC_MINORS; | |
541 | + else | |
542 | + blkdev->gd->first_minor = 0; | |
543 | + blkdev->gd->fops = &block_ops; | |
544 | + blkdev->gd->private_data = blkdev; | |
545 | + sprintf(blkdev->gd->disk_name, "hd%c", 'a'+ devnum); | |
546 | + | |
547 | + blkvsc_do_inquiry(blkdev); | |
548 | + if (blkdev->device_type == DVD_TYPE) | |
549 | + { | |
550 | + set_disk_ro(blkdev->gd, 1); | |
551 | + blkdev->gd->flags |= GENHD_FL_REMOVABLE; | |
552 | + blkvsc_do_read_capacity(blkdev); | |
553 | + } | |
554 | + else | |
555 | + { | |
556 | + blkvsc_do_read_capacity16(blkdev); | |
557 | + } | |
558 | + | |
559 | + set_capacity(blkdev->gd, blkdev->capacity * (blkdev->sector_size/512)); | |
560 | + blk_queue_hardsect_size(blkdev->gd->queue, blkdev->sector_size); | |
561 | + // go! | |
562 | + add_disk(blkdev->gd); | |
563 | + | |
564 | + DPRINT_INFO(BLKVSC_DRV, "%s added!! capacity %llu sector_size %d", blkdev->gd->disk_name, blkdev->capacity, blkdev->sector_size); | |
565 | + | |
566 | + return ret; | |
567 | + | |
568 | +Remove: | |
569 | + storvsc_drv_obj->Base.OnDeviceRemove(device_obj); | |
570 | + | |
571 | +Cleanup: | |
572 | + if (blkdev) | |
573 | + { | |
574 | + if (blkdev->request_pool) | |
575 | + { | |
576 | + kmem_cache_destroy(blkdev->request_pool); | |
577 | + blkdev->request_pool = NULL; | |
578 | + } | |
579 | + kfree(blkdev); | |
580 | + blkdev = NULL; | |
581 | + } | |
582 | + | |
583 | + DPRINT_EXIT(BLKVSC_DRV); | |
584 | + | |
585 | + return ret; | |
586 | +} | |
587 | + | |
588 | +static void blkvsc_shutdown(struct device *device) | |
589 | +{ | |
590 | + struct block_device_context *blkdev = (struct block_device_context*)device->driver_data; | |
591 | + unsigned long flags; | |
592 | + | |
593 | + if (!blkdev) | |
594 | + return; | |
595 | + | |
596 | + DPRINT_DBG(BLKVSC_DRV, "blkvsc_shutdown - users %d disk %s\n", blkdev->users, blkdev->gd->disk_name); | |
597 | + | |
598 | + spin_lock_irqsave(&blkdev->lock, flags); | |
599 | + | |
600 | + blkdev->shutting_down = 1; | |
601 | + | |
602 | + blk_stop_queue(blkdev->gd->queue); | |
603 | + | |
604 | + spin_unlock_irqrestore(&blkdev->lock, flags); | |
605 | + | |
606 | + while (blkdev->num_outstanding_reqs) | |
607 | + { | |
608 | + DPRINT_INFO(STORVSC, "waiting for %d requests to complete...", blkdev->num_outstanding_reqs); | |
609 | + | |
610 | + udelay(100); | |
611 | + } | |
612 | + | |
613 | + blkvsc_do_flush(blkdev); | |
614 | + | |
615 | + spin_lock_irqsave(&blkdev->lock, flags); | |
616 | + | |
617 | + blkvsc_cancel_pending_reqs(blkdev); | |
618 | + | |
619 | + spin_unlock_irqrestore(&blkdev->lock, flags); | |
620 | +} | |
621 | + | |
622 | +static int blkvsc_do_flush(struct block_device_context *blkdev) | |
623 | +{ | |
624 | + struct blkvsc_request *blkvsc_req=NULL; | |
625 | + | |
626 | + DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_flush()\n"); | |
627 | + | |
628 | + if (blkdev->device_type != HARDDISK_TYPE) | |
629 | + return 0; | |
630 | + | |
631 | + blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL); | |
632 | + if (!blkvsc_req) | |
633 | + { | |
634 | + return -ENOMEM; | |
635 | + } | |
636 | + | |
637 | + memset(blkvsc_req, 0, sizeof(struct blkvsc_request)); | |
638 | + init_waitqueue_head(&blkvsc_req->wevent); | |
639 | + blkvsc_req->dev = blkdev; | |
640 | + blkvsc_req->req = NULL; | |
641 | + blkvsc_req->write = 0; | |
642 | + | |
643 | + blkvsc_req->request.DataBuffer.PfnArray[0] = 0; | |
644 | + blkvsc_req->request.DataBuffer.Offset = 0; | |
645 | + blkvsc_req->request.DataBuffer.Length = 0; | |
646 | + | |
647 | + blkvsc_req->cmnd[0] = SYNCHRONIZE_CACHE; | |
648 | + blkvsc_req->cmd_len = 10; | |
649 | + | |
650 | + // Set this here since the completion routine may be invoked and completed before we return | |
651 | + blkvsc_req->cond =0; | |
652 | + blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion); | |
653 | + | |
654 | + wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond); | |
655 | + | |
656 | + kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); | |
657 | + | |
658 | + return 0; | |
659 | +} | |
660 | + | |
661 | +// Do a scsi INQUIRY cmd here to get the device type (ie disk or dvd) | |
662 | +static int blkvsc_do_inquiry(struct block_device_context *blkdev) | |
663 | +{ | |
664 | + struct blkvsc_request *blkvsc_req=NULL; | |
665 | + struct page *page_buf; | |
666 | + unsigned char *buf; | |
667 | + unsigned char device_type; | |
668 | + | |
669 | + DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_inquiry()\n"); | |
670 | + | |
671 | + blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL); | |
672 | + if (!blkvsc_req) | |
673 | + { | |
674 | + return -ENOMEM; | |
675 | + } | |
676 | + | |
677 | + memset(blkvsc_req, 0, sizeof(struct blkvsc_request)); | |
678 | + page_buf = alloc_page(GFP_KERNEL); | |
679 | + if (!page_buf) | |
680 | + { | |
681 | + kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); | |
682 | + return -ENOMEM; | |
683 | + } | |
684 | + | |
685 | + init_waitqueue_head(&blkvsc_req->wevent); | |
686 | + blkvsc_req->dev = blkdev; | |
687 | + blkvsc_req->req = NULL; | |
688 | + blkvsc_req->write = 0; | |
689 | + | |
690 | + blkvsc_req->request.DataBuffer.PfnArray[0] = page_to_pfn(page_buf); | |
691 | + blkvsc_req->request.DataBuffer.Offset = 0; | |
692 | + blkvsc_req->request.DataBuffer.Length = 64; | |
693 | + | |
694 | + blkvsc_req->cmnd[0] = INQUIRY; | |
695 | + blkvsc_req->cmnd[1] = 0x1; // Get product data | |
696 | + blkvsc_req->cmnd[2] = 0x83; // mode page 83 | |
697 | + blkvsc_req->cmnd[4] = 64; | |
698 | + blkvsc_req->cmd_len = 6; | |
699 | + | |
700 | + // Set this here since the completion routine may be invoked and completed before we return | |
701 | + blkvsc_req->cond =0; | |
702 | + | |
703 | + blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion); | |
704 | + | |
705 | + DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete - cond %d\n", blkvsc_req, blkvsc_req->cond); | |
706 | + | |
707 | + wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond); | |
708 | + | |
709 | + buf = kmap(page_buf); | |
710 | + | |
711 | + //PrintBytes(buf, 64); | |
712 | + // be to le | |
713 | + device_type = buf[0] & 0x1F; | |
714 | + | |
715 | + if (device_type == 0x0) | |
716 | + { | |
717 | + blkdev->device_type = HARDDISK_TYPE; | |
718 | + } | |
719 | + else if (device_type == 0x5) | |
720 | + { | |
721 | + blkdev->device_type = DVD_TYPE; | |
722 | + } | |
723 | + else | |
724 | + { | |
725 | + // TODO: this is currently unsupported device type | |
726 | + blkdev->device_type = UNKNOWN_DEV_TYPE; | |
727 | + } | |
728 | + | |
729 | + DPRINT_DBG(BLKVSC_DRV, "device type %d \n", device_type); | |
730 | + | |
731 | + blkdev->device_id_len = buf[7]; | |
732 | + if (blkdev->device_id_len > 64) | |
733 | + blkdev->device_id_len = 64; | |
734 | + | |
735 | + memcpy(blkdev->device_id, &buf[8], blkdev->device_id_len); | |
736 | + //PrintBytes(blkdev->device_id, blkdev->device_id_len); | |
737 | + | |
738 | + kunmap(page_buf); | |
739 | + | |
740 | + __free_page(page_buf); | |
741 | + | |
742 | + kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); | |
743 | + | |
744 | + return 0; | |
745 | +} | |
746 | + | |
747 | +// Do a scsi READ_CAPACITY cmd here to get the size of the disk | |
748 | +static int blkvsc_do_read_capacity(struct block_device_context *blkdev) | |
749 | +{ | |
750 | + struct blkvsc_request *blkvsc_req=NULL; | |
751 | + struct page *page_buf; | |
752 | + unsigned char *buf; | |
753 | + struct scsi_sense_hdr sense_hdr; | |
754 | + | |
755 | + DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_read_capacity()\n"); | |
756 | + | |
757 | + blkdev->sector_size = 0; | |
758 | + blkdev->capacity = 0; | |
759 | + blkdev->media_not_present = 0; // assume a disk is present | |
760 | + | |
761 | + blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL); | |
762 | + if (!blkvsc_req) | |
763 | + { | |
764 | + return -ENOMEM; | |
765 | + } | |
766 | + | |
767 | + memset(blkvsc_req, 0, sizeof(struct blkvsc_request)); | |
768 | + page_buf = alloc_page(GFP_KERNEL); | |
769 | + if (!page_buf) | |
770 | + { | |
771 | + kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); | |
772 | + return -ENOMEM; | |
773 | + } | |
774 | + | |
775 | + init_waitqueue_head(&blkvsc_req->wevent); | |
776 | + blkvsc_req->dev = blkdev; | |
777 | + blkvsc_req->req = NULL; | |
778 | + blkvsc_req->write = 0; | |
779 | + | |
780 | + blkvsc_req->request.DataBuffer.PfnArray[0] = page_to_pfn(page_buf); | |
781 | + blkvsc_req->request.DataBuffer.Offset = 0; | |
782 | + blkvsc_req->request.DataBuffer.Length = 8; | |
783 | + | |
784 | + blkvsc_req->cmnd[0] = READ_CAPACITY; | |
785 | + blkvsc_req->cmd_len = 16; | |
786 | + | |
787 | + // Set this here since the completion routine may be invoked and completed before we return | |
788 | + blkvsc_req->cond =0; | |
789 | + | |
790 | + blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion); | |
791 | + | |
792 | + DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete - cond %d\n", blkvsc_req, blkvsc_req->cond); | |
793 | + | |
794 | + wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond); | |
795 | + | |
796 | + // check error | |
797 | + if (blkvsc_req->request.Status) | |
798 | + { | |
799 | + scsi_normalize_sense(blkvsc_req->sense_buffer, SCSI_SENSE_BUFFERSIZE, &sense_hdr); | |
800 | + | |
801 | + if (sense_hdr.asc == 0x3A) // Medium not present | |
802 | + { | |
803 | + blkdev->media_not_present = 1; | |
804 | + } | |
805 | + | |
806 | + return 0; | |
807 | + } | |
808 | + buf = kmap(page_buf); | |
809 | + | |
810 | + // be to le | |
811 | + blkdev->capacity = ((buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3]) + 1; | |
812 | + blkdev->sector_size = (buf[4] << 24) | (buf[5] << 16) | (buf[6] << 8) | buf[7]; | |
813 | + | |
814 | + kunmap(page_buf); | |
815 | + | |
816 | + __free_page(page_buf); | |
817 | + | |
818 | + kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); | |
819 | + | |
820 | + return 0; | |
821 | +} | |
822 | + | |
823 | + | |
824 | +static int blkvsc_do_read_capacity16(struct block_device_context *blkdev) | |
825 | +{ | |
826 | + struct blkvsc_request *blkvsc_req=NULL; | |
827 | + struct page *page_buf; | |
828 | + unsigned char *buf; | |
829 | + struct scsi_sense_hdr sense_hdr; | |
830 | + | |
831 | + DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_read_capacity16()\n"); | |
832 | + | |
833 | + blkdev->sector_size = 0; | |
834 | + blkdev->capacity = 0; | |
835 | + blkdev->media_not_present = 0; // assume a disk is present | |
836 | + | |
837 | + blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL); | |
838 | + if (!blkvsc_req) | |
839 | + { | |
840 | + return -ENOMEM; | |
841 | + } | |
842 | + | |
843 | + memset(blkvsc_req, 0, sizeof(struct blkvsc_request)); | |
844 | + page_buf = alloc_page(GFP_KERNEL); | |
845 | + if (!page_buf) | |
846 | + { | |
847 | + kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); | |
848 | + return -ENOMEM; | |
849 | + } | |
850 | + | |
851 | + init_waitqueue_head(&blkvsc_req->wevent); | |
852 | + blkvsc_req->dev = blkdev; | |
853 | + blkvsc_req->req = NULL; | |
854 | + blkvsc_req->write = 0; | |
855 | + | |
856 | + blkvsc_req->request.DataBuffer.PfnArray[0] = page_to_pfn(page_buf); | |
857 | + blkvsc_req->request.DataBuffer.Offset = 0; | |
858 | + blkvsc_req->request.DataBuffer.Length = 12; | |
859 | + | |
860 | + blkvsc_req->cmnd[0] = 0x9E; //READ_CAPACITY16; | |
861 | + blkvsc_req->cmd_len = 16; | |
862 | + | |
863 | + // Set this here since the completion routine may be invoked and completed before we return | |
864 | + blkvsc_req->cond =0; | |
865 | + | |
866 | + blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion); | |
867 | + | |
868 | + DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete - cond %d\n", blkvsc_req, blkvsc_req->cond); | |
869 | + | |
870 | + wait_event_interruptible(blkvsc_req->wevent, blkvsc_req->cond); | |
871 | + | |
872 | + // check error | |
873 | + if (blkvsc_req->request.Status) | |
874 | + { | |
875 | + scsi_normalize_sense(blkvsc_req->sense_buffer, SCSI_SENSE_BUFFERSIZE, &sense_hdr); | |
876 | + | |
877 | + if (sense_hdr.asc == 0x3A) // Medium not present | |
878 | + { | |
879 | + blkdev->media_not_present = 1; | |
880 | + } | |
881 | + | |
882 | + return 0; | |
883 | + } | |
884 | + buf = kmap(page_buf); | |
885 | + | |
886 | + // be to le | |
887 | + blkdev->capacity = be64_to_cpu(*(unsigned long long*) &buf[0]) + 1; | |
888 | + blkdev->sector_size = be32_to_cpu(*(unsigned int*)&buf[8]); | |
889 | + | |
890 | + //blkdev->capacity = ((buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3]) + 1; | |
891 | + //blkdev->sector_size = (buf[4] << 24) | (buf[5] << 16) | (buf[6] << 8) | buf[7]; | |
892 | + | |
893 | + kunmap(page_buf); | |
894 | + | |
895 | + __free_page(page_buf); | |
896 | + | |
897 | + kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req); | |
898 | + | |
899 | + return 0; | |
900 | +} | |
901 | + | |
902 | +/*++ | |
903 | + | |
904 | +Name: blkvsc_remove() | |
905 | + | |
906 | +Desc: Callback when our device is removed | |
907 | + | |
908 | +--*/ | |
909 | +static int blkvsc_remove(struct device *device) | |
910 | +{ | |
911 | + int ret=0; | |
912 | + | |
913 | + struct driver_context *driver_ctx = driver_to_driver_context(device->driver); | |
914 | + struct blkvsc_driver_context *blkvsc_drv_ctx = (struct blkvsc_driver_context*)driver_ctx; | |
915 | + STORVSC_DRIVER_OBJECT* storvsc_drv_obj = &blkvsc_drv_ctx->drv_obj; | |
916 | + | |
917 | + struct device_context *device_ctx = device_to_device_context(device); | |
918 | + DEVICE_OBJECT* device_obj = &device_ctx->device_obj; | |
919 | + struct block_device_context *blkdev = (struct block_device_context*)device->driver_data; | |
920 | + unsigned long flags; | |
921 | + | |
922 | + DPRINT_ENTER(BLKVSC_DRV); | |
923 | + | |
924 | + DPRINT_DBG(BLKVSC_DRV, "blkvsc_remove()\n"); | |
925 | + | |
926 | + if (!storvsc_drv_obj->Base.OnDeviceRemove) | |
927 | + { | |
928 | + DPRINT_EXIT(BLKVSC_DRV); | |
929 | + return -1; | |
930 | + } | |
931 | + | |
932 | + // Call to the vsc driver to let it know that the device is being removed | |
933 | + ret = storvsc_drv_obj->Base.OnDeviceRemove(device_obj); | |
934 | + if (ret != 0) | |
935 | + { | |
936 | + // TODO: | |
937 | + DPRINT_ERR(BLKVSC_DRV, "unable to remove blkvsc device (ret %d)", ret); | |
938 | + } | |
939 | + | |
940 | + // Get to a known state | |
941 | + spin_lock_irqsave(&blkdev->lock, flags); | |
942 | + | |
943 | + blkdev->shutting_down = 1; | |
944 | + | |
945 | + blk_stop_queue(blkdev->gd->queue); | |
946 | + | |
947 | + spin_unlock_irqrestore(&blkdev->lock, flags); | |
948 | + | |
949 | + while (blkdev->num_outstanding_reqs) | |
950 | + { | |
951 | + DPRINT_INFO(STORVSC, "waiting for %d requests to complete...", blkdev->num_outstanding_reqs); | |
952 | + | |
953 | + udelay(100); | |
954 | + } | |
955 | + | |
956 | + blkvsc_do_flush(blkdev); | |
957 | + | |
958 | + spin_lock_irqsave(&blkdev->lock, flags); | |
959 | + | |
960 | + blkvsc_cancel_pending_reqs(blkdev); | |
961 | + | |
962 | + spin_unlock_irqrestore(&blkdev->lock, flags); | |
963 | + | |
964 | + blk_cleanup_queue(blkdev->gd->queue); | |
965 | + | |
966 | + del_gendisk(blkdev->gd); | |
967 | + | |
968 | + kmem_cache_destroy(blkdev->request_pool); | |
969 | + | |
970 | + kfree(blkdev); | |
971 | + | |
972 | + DPRINT_EXIT(BLKVSC_DRV); | |
973 | + | |
974 | + return ret; | |
975 | +} | |
976 | + | |
977 | +static void blkvsc_init_rw(struct blkvsc_request *blkvsc_req) | |
978 | +{ | |
979 | + ASSERT(blkvsc_req->req); | |
980 | + ASSERT(blkvsc_req->sector_count <= (MAX_MULTIPAGE_BUFFER_COUNT*8)); | |
981 | + | |
982 | + blkvsc_req->cmd_len = 16; | |
983 | + | |
984 | + if (blkvsc_req->sector_start > 0xffffffff) | |
985 | + { | |
986 | + if (rq_data_dir(blkvsc_req->req)) | |
987 | + { | |
988 | + blkvsc_req->write = 1; | |
989 | + blkvsc_req->cmnd[0] = WRITE_16; | |
990 | + } | |
991 | + else | |
992 | + { | |
993 | + blkvsc_req->write = 0; | |
994 | + blkvsc_req->cmnd[0] = READ_16; | |
995 | + } | |
996 | + | |
997 | + blkvsc_req->cmnd[1] |= blk_fua_rq(blkvsc_req->req) ? 0x8 : 0; | |
998 | + | |
999 | + *(unsigned long long*)&blkvsc_req->cmnd[2] = cpu_to_be64(blkvsc_req->sector_start); | |
1000 | + *(unsigned int*)&blkvsc_req->cmnd[10] = cpu_to_be32(blkvsc_req->sector_count); | |
1001 | + } | |
1002 | + else if ((blkvsc_req->sector_count > 0xff) || (blkvsc_req->sector_start > 0x1fffff)) | |
1003 | + { | |
1004 | + if (rq_data_dir(blkvsc_req->req)) | |
1005 | + { | |
1006 | + blkvsc_req->write = 1; | |
1007 | + blkvsc_req->cmnd[0] = WRITE_10; | |
1008 | + } | |
1009 | + else | |
1010 | + { | |
1011 | + blkvsc_req->write = 0; | |
1012 | + blkvsc_req->cmnd[0] = READ_10; | |
1013 | + } | |
1014 | + | |
1015 | + blkvsc_req->cmnd[1] |= blk_fua_rq(blkvsc_req->req) ? 0x8 : 0; | |
1016 | + | |
1017 | + *(unsigned int *)&blkvsc_req->cmnd[2] = cpu_to_be32(blkvsc_req->sector_start); | |
1018 | + *(unsigned short*)&blkvsc_req->cmnd[7] = cpu_to_be16(blkvsc_req->sector_count); | |
1019 | + } | |
1020 | + else | |
1021 | + { | |
1022 | + if (rq_data_dir(blkvsc_req->req)) | |
1023 | + { | |
1024 | + blkvsc_req->write = 1; | |
1025 | + blkvsc_req->cmnd[0] = WRITE_6; | |
1026 | + } | |
1027 | + else | |
1028 | + { | |
1029 | + blkvsc_req->write = 0; | |
1030 | + blkvsc_req->cmnd[0] = READ_6; | |
1031 | + } | |
1032 | + | |
1033 | + *(unsigned int *)&blkvsc_req->cmnd[1] = cpu_to_be32(blkvsc_req->sector_start) >> 8; | |
1034 | + blkvsc_req->cmnd[1] &= 0x1f; | |
1035 | + blkvsc_req->cmnd[4] = (unsigned char) blkvsc_req->sector_count; | |
1036 | + } | |
1037 | +} | |
1038 | + | |
1039 | +static int blkvsc_submit_request(struct blkvsc_request *blkvsc_req, void (*request_completion)(STORVSC_REQUEST*) ) | |
1040 | +{ | |
1041 | + struct block_device_context *blkdev = blkvsc_req->dev; | |
1042 | + struct device_context *device_ctx=blkdev->device_ctx; | |
1043 | + struct driver_context *driver_ctx = driver_to_driver_context(device_ctx->device.driver); | |
1044 | + struct blkvsc_driver_context *blkvsc_drv_ctx = (struct blkvsc_driver_context*)driver_ctx; | |
1045 | + STORVSC_DRIVER_OBJECT* storvsc_drv_obj = &blkvsc_drv_ctx->drv_obj; | |
1046 | + int ret =0; | |
1047 | + | |
1048 | + STORVSC_REQUEST *storvsc_req; | |
1049 | + | |
1050 | + DPRINT_DBG(BLKVSC_DRV, "blkvsc_submit_request() - req %p type %s start_sector %llu count %d offset %d len %d\n", | |
1051 | + blkvsc_req, | |
1052 | + (blkvsc_req->write)?"WRITE":"READ", | |
1053 | + blkvsc_req->sector_start, | |
1054 | + blkvsc_req->sector_count, | |
1055 | + blkvsc_req->request.DataBuffer.Offset, | |
1056 | + blkvsc_req->request.DataBuffer.Length); | |
1057 | + | |
1058 | + /*for (i=0; i < (blkvsc_req->request.DataBuffer.Length >> 12); i++) | |
1059 | + { | |
1060 | + DPRINT_DBG(BLKVSC_DRV, "blkvsc_submit_request() - req %p pfn[%d] %llx\n", | |
1061 | + blkvsc_req, | |
1062 | + i, | |
1063 | + blkvsc_req->request.DataBuffer.PfnArray[i]); | |
1064 | + }*/ | |
1065 | + | |
1066 | + storvsc_req = &blkvsc_req->request; | |
1067 | + storvsc_req->Extension = (void*)((unsigned long)blkvsc_req + sizeof(struct blkvsc_request)); | |
1068 | + | |
1069 | + storvsc_req->Type = blkvsc_req->write? WRITE_TYPE : READ_TYPE; | |
1070 | + | |
1071 | + storvsc_req->OnIOCompletion = request_completion; | |
1072 | + storvsc_req->Context = blkvsc_req; | |
1073 | + | |
1074 | + storvsc_req->Host = blkdev->port; | |
1075 | + storvsc_req->Bus = blkdev->path; | |
1076 | + storvsc_req->TargetId = blkdev->target; | |
1077 | + storvsc_req->LunId = 0; // this is not really used at all | |
1078 | + | |
1079 | + storvsc_req->CdbLen = blkvsc_req->cmd_len; | |
1080 | + storvsc_req->Cdb = blkvsc_req->cmnd; | |
1081 | + | |
1082 | + storvsc_req->SenseBuffer = blkvsc_req->sense_buffer; | |
1083 | + storvsc_req->SenseBufferSize = SCSI_SENSE_BUFFERSIZE; | |
1084 | + | |
1085 | + ret = storvsc_drv_obj->OnIORequest(&blkdev->device_ctx->device_obj, &blkvsc_req->request); | |
1086 | + if (ret == 0) | |
1087 | + { | |
1088 | + blkdev->num_outstanding_reqs++; | |
1089 | + } | |
1090 | + | |
1091 | + return ret; | |
1092 | +} | |
1093 | + | |
1094 | +// | |
1095 | +// We break the request into 1 or more blkvsc_requests and submit them. | |
1096 | +// If we cant submit them all, we put them on the pending_list. The | |
1097 | +// blkvsc_request() will work on the pending_list. | |
1098 | +// | |
1099 | +static int blkvsc_do_request(struct block_device_context *blkdev, struct request *req) | |
1100 | +{ | |
1101 | + struct bio *bio=NULL; | |
1102 | + struct bio_vec *bvec=NULL; | |
1103 | + struct bio_vec *prev_bvec=NULL; | |
1104 | + | |
1105 | + struct blkvsc_request *blkvsc_req=NULL; | |
1106 | + struct blkvsc_request *tmp; | |
1107 | + int databuf_idx=0; | |
1108 | + int seg_idx=0; | |
1109 | + | |
1110 | + sector_t start_sector; | |
1111 | + unsigned long num_sectors = 0; | |
1112 | + int ret=0; | |
1113 | + int pending=0; | |
1114 | + struct blkvsc_request_group *group=NULL; | |
1115 | + | |
1116 | + DPRINT_DBG(BLKVSC_DRV, "blkdev %p req %p sect %llu \n", blkdev, req, req->sector); | |
1117 | + | |
1118 | + // Create a group to tie req to list of blkvsc_reqs | |
1119 | + group = (struct blkvsc_request_group*)kmem_cache_alloc(blkdev->request_pool, GFP_ATOMIC); | |
1120 | + if (!group) | |
1121 | + { | |
1122 | + return -ENOMEM; | |
1123 | + } | |
1124 | + | |
1125 | + INIT_LIST_HEAD(&group->blkvsc_req_list); | |
1126 | + group->outstanding = group->status = 0; | |
1127 | + | |
1128 | + start_sector = req->sector; | |
1129 | + | |
1130 | + // foreach bio in the request | |
1131 | + if (req->bio) | |
1132 | + for (bio = req->bio; bio; bio = bio->bi_next) | |
1133 | + { | |
1134 | + // Map this bio into an existing or new storvsc request | |
1135 | + bio_for_each_segment (bvec, bio, seg_idx) | |
1136 | + { | |
1137 | + DPRINT_DBG(BLKVSC_DRV, "bio_for_each_segment() - req %p bio %p bvec %p seg_idx %d databuf_idx %d\n", | |
1138 | + req, bio, bvec, seg_idx, databuf_idx); | |
1139 | + | |
1140 | + // Get a new storvsc request | |
1141 | + if ( (!blkvsc_req) || // 1st-time | |
1142 | + (databuf_idx >= MAX_MULTIPAGE_BUFFER_COUNT) || | |
1143 | + (bvec->bv_offset != 0) || // hole at the begin of page | |
1144 | + (prev_bvec && (prev_bvec->bv_len != PAGE_SIZE)) ) // hold at the end of page | |
1145 | + { | |
1146 | + // submit the prev one | |
1147 | + if (blkvsc_req) | |
1148 | + { | |
1149 | + blkvsc_req->sector_start = start_sector; | |
1150 | + sector_div(blkvsc_req->sector_start, (blkdev->sector_size >> 9)); | |
1151 | + | |
1152 | + blkvsc_req->sector_count = num_sectors / (blkdev->sector_size >> 9); | |
1153 | + | |
1154 | + blkvsc_init_rw(blkvsc_req); | |
1155 | + } | |
1156 | + | |
1157 | + // Create new blkvsc_req to represent the current bvec | |
1158 | + blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_ATOMIC); | |
1159 | + if (!blkvsc_req) | |
1160 | + { | |
1161 | + // free up everything | |
1162 | + list_for_each_entry_safe(blkvsc_req, tmp, &group->blkvsc_req_list, req_entry) | |
1163 | + { | |
1164 | + list_del(&blkvsc_req->req_entry); | |
1165 | + kmem_cache_free(blkdev->request_pool, blkvsc_req); | |
1166 | + } | |
1167 | + | |
1168 | + kmem_cache_free(blkdev->request_pool, group); | |
1169 | + return -ENOMEM; | |
1170 | + } | |
1171 | + | |
1172 | + memset(blkvsc_req, 0, sizeof(struct blkvsc_request)); | |
1173 | + | |
1174 | + blkvsc_req->dev = blkdev; | |
1175 | + blkvsc_req->req = req; | |
1176 | + blkvsc_req->request.DataBuffer.Offset = bvec->bv_offset; | |
1177 | + blkvsc_req->request.DataBuffer.Length = 0; | |
1178 | + | |
1179 | + // Add to the group | |
1180 | + blkvsc_req->group = group; | |
1181 | + blkvsc_req->group->outstanding++; | |
1182 | + list_add_tail(&blkvsc_req->req_entry, &blkvsc_req->group->blkvsc_req_list); | |
1183 | + | |
1184 | + start_sector += num_sectors; | |
1185 | + num_sectors = 0; | |
1186 | + databuf_idx = 0; | |
1187 | + } | |
1188 | + | |
1189 | + // Add the curr bvec/segment to the curr blkvsc_req | |
1190 | + blkvsc_req->request.DataBuffer.PfnArray[databuf_idx] = page_to_pfn(bvec->bv_page); | |
1191 | + blkvsc_req->request.DataBuffer.Length += bvec->bv_len; | |
1192 | + | |
1193 | + prev_bvec = bvec; | |
1194 | + | |
1195 | + databuf_idx++; | |
1196 | + num_sectors += bvec->bv_len >> 9; | |
1197 | + | |
1198 | + } // bio_for_each_segment | |
1199 | + | |
1200 | + } // rq_for_each_bio | |
1201 | + | |
1202 | + // Handle the last one | |
1203 | + if (blkvsc_req) | |
1204 | + { | |
1205 | + DPRINT_DBG(BLKVSC_DRV, "blkdev %p req %p group %p count %d\n", blkdev, req, blkvsc_req->group, blkvsc_req->group->outstanding); | |
1206 | + | |
1207 | + blkvsc_req->sector_start = start_sector; | |
1208 | + sector_div(blkvsc_req->sector_start, (blkdev->sector_size >> 9)); | |
1209 | + | |
1210 | + blkvsc_req->sector_count = num_sectors / (blkdev->sector_size >> 9); | |
1211 | + | |
1212 | + blkvsc_init_rw(blkvsc_req); | |
1213 | + } | |
1214 | + | |
1215 | + list_for_each_entry(blkvsc_req, &group->blkvsc_req_list, req_entry) | |
1216 | + { | |
1217 | + if (pending) | |
1218 | + { | |
1219 | + DPRINT_DBG(BLKVSC_DRV, "adding blkvsc_req to pending_list - blkvsc_req %p start_sect %llu sect_count %d (%llu %d)\n", | |
1220 | + blkvsc_req, blkvsc_req->sector_start, blkvsc_req->sector_count, start_sector, num_sectors); | |
1221 | + | |
1222 | + list_add_tail(&blkvsc_req->pend_entry, &blkdev->pending_list); | |
1223 | + } | |
1224 | + else | |
1225 | + { | |
1226 | + ret = blkvsc_submit_request(blkvsc_req, blkvsc_request_completion); | |
1227 | + if (ret == -1) | |
1228 | + { | |
1229 | + pending = 1; | |
1230 | + list_add_tail(&blkvsc_req->pend_entry, &blkdev->pending_list); | |
1231 | + } | |
1232 | + | |
1233 | + DPRINT_DBG(BLKVSC_DRV, "submitted blkvsc_req %p start_sect %llu sect_count %d (%llu %d) ret %d\n", | |
1234 | + blkvsc_req, blkvsc_req->sector_start, blkvsc_req->sector_count, start_sector, num_sectors, ret); | |
1235 | + } | |
1236 | + } | |
1237 | + | |
1238 | + return pending; | |
1239 | +} | |
1240 | + | |
1241 | +static void blkvsc_cmd_completion(STORVSC_REQUEST* request) | |
1242 | +{ | |
1243 | + struct blkvsc_request *blkvsc_req=(struct blkvsc_request*)request->Context; | |
1244 | + struct block_device_context *blkdev = (struct block_device_context*)blkvsc_req->dev; | |
1245 | + | |
1246 | + struct scsi_sense_hdr sense_hdr; | |
1247 | + | |
1248 | + DPRINT_DBG(BLKVSC_DRV, "blkvsc_cmd_completion() - req %p\n", blkvsc_req); | |
1249 | + | |
1250 | + blkdev->num_outstanding_reqs--; | |
1251 | + | |
1252 | + if (blkvsc_req->request.Status) | |
1253 | + { | |
1254 | + if (scsi_normalize_sense(blkvsc_req->sense_buffer, SCSI_SENSE_BUFFERSIZE, &sense_hdr)) | |
1255 | + { | |
1256 | + scsi_print_sense_hdr("blkvsc", &sense_hdr); | |
1257 | + } | |
1258 | + } | |
1259 | + | |
1260 | + blkvsc_req->cond =1; | |
1261 | + wake_up_interruptible(&blkvsc_req->wevent); | |
1262 | +} | |
1263 | + | |
1264 | +static void blkvsc_request_completion(STORVSC_REQUEST* request) | |
1265 | +{ | |
1266 | + struct blkvsc_request *blkvsc_req=(struct blkvsc_request*)request->Context; | |
1267 | + struct block_device_context *blkdev = (struct block_device_context*)blkvsc_req->dev; | |
1268 | + unsigned long flags; | |
1269 | + struct blkvsc_request *comp_req, *tmp; | |
1270 | + | |
1271 | + ASSERT(blkvsc_req->group); | |
1272 | + | |
1273 | + DPRINT_DBG(BLKVSC_DRV, "blkdev %p blkvsc_req %p group %p type %s sect_start %llu sect_count %d len %d group outstd %d total outstd %d\n", | |
1274 | + blkdev, | |
1275 | + blkvsc_req, | |
1276 | + blkvsc_req->group, | |
1277 | + (blkvsc_req->write)?"WRITE":"READ", | |
1278 | + blkvsc_req->sector_start, | |
1279 | + blkvsc_req->sector_count, | |
1280 | + blkvsc_req->request.DataBuffer.Length, | |
1281 | + blkvsc_req->group->outstanding, | |
1282 | + blkdev->num_outstanding_reqs); | |
1283 | + | |
1284 | + spin_lock_irqsave(&blkdev->lock, flags); | |
1285 | + | |
1286 | + blkdev->num_outstanding_reqs--; | |
1287 | + blkvsc_req->group->outstanding--; | |
1288 | + | |
1289 | + // Only start processing when all the blkvsc_reqs are completed. This guarantees no out-of-order | |
1290 | + // blkvsc_req completion when calling end_that_request_first() | |
1291 | + if (blkvsc_req->group->outstanding == 0) | |
1292 | + { | |
1293 | + list_for_each_entry_safe(comp_req, tmp, &blkvsc_req->group->blkvsc_req_list, req_entry) | |
1294 | + { | |
1295 | + DPRINT_DBG(BLKVSC_DRV, "completing blkvsc_req %p sect_start %llu sect_count %d \n", | |
1296 | + comp_req, | |
1297 | + comp_req->sector_start, | |
1298 | + comp_req->sector_count); | |
1299 | + | |
1300 | + list_del(&comp_req->req_entry); | |
1301 | + | |
1302 | +#ifdef KERNEL_2_6_27 | |
1303 | + if (!__blk_end_request( | |
1304 | + comp_req->req, | |
1305 | + (!comp_req->request.Status ? 0: -EIO), | |
1306 | + comp_req->sector_count * blkdev->sector_size)) | |
1307 | + { | |
1308 | + //All the sectors have been xferred ie the request is done | |
1309 | + DPRINT_DBG(BLKVSC_DRV, "req %p COMPLETED\n", comp_req->req); | |
1310 | + kmem_cache_free(blkdev->request_pool, comp_req->group); | |
1311 | + } | |
1312 | +#else | |
1313 | + if (!end_that_request_first(comp_req->req, !comp_req->request.Status, (comp_req->sector_count * (blkdev->sector_size >> 9)))) | |
1314 | + { | |
1315 | + //All the sectors have been xferred ie the request is done | |
1316 | + DPRINT_DBG(BLKVSC_DRV, "req %p COMPLETED\n", comp_req->req); | |
1317 | + | |
1318 | + end_that_request_last(comp_req->req, !comp_req->request.Status); | |
1319 | + | |
1320 | + kmem_cache_free(blkdev->request_pool, comp_req->group); | |
1321 | + } | |
1322 | +#endif | |
1323 | + | |
1324 | + kmem_cache_free(blkdev->request_pool, comp_req); | |
1325 | + } | |
1326 | + | |
1327 | + if (!blkdev->shutting_down) | |
1328 | + { | |
1329 | + blkvsc_do_pending_reqs(blkdev); | |
1330 | + blk_start_queue(blkdev->gd->queue); | |
1331 | + blkvsc_request(blkdev->gd->queue); | |
1332 | + } | |
1333 | + } | |
1334 | + | |
1335 | + spin_unlock_irqrestore(&blkdev->lock, flags); | |
1336 | +} | |
1337 | + | |
1338 | +static int blkvsc_cancel_pending_reqs(struct block_device_context *blkdev) | |
1339 | +{ | |
1340 | + struct blkvsc_request *pend_req, *tmp; | |
1341 | + struct blkvsc_request *comp_req, *tmp2; | |
1342 | + | |
1343 | + int ret=0; | |
1344 | + | |
1345 | + DPRINT_DBG(BLKVSC_DRV, "blkvsc_cancel_pending_reqs()"); | |
1346 | + | |
1347 | + // Flush the pending list first | |
1348 | + list_for_each_entry_safe(pend_req, tmp, &blkdev->pending_list, pend_entry) | |
1349 | + { | |
1350 | + // The pend_req could be part of a partially completed request. If so, complete those req first | |
1351 | + // until we hit the pend_req | |
1352 | + list_for_each_entry_safe(comp_req, tmp2, &pend_req->group->blkvsc_req_list, req_entry) | |
1353 | + { | |
1354 | + DPRINT_DBG(BLKVSC_DRV, "completing blkvsc_req %p sect_start %llu sect_count %d \n", | |
1355 | + comp_req, | |
1356 | + comp_req->sector_start, | |
1357 | + comp_req->sector_count); | |
1358 | + | |
1359 | + if (comp_req == pend_req) | |
1360 | + break; | |
1361 | + | |
1362 | + list_del(&comp_req->req_entry); | |
1363 | + | |
1364 | + if (comp_req->req) | |
1365 | + { | |
1366 | +#ifdef KERNEL_2_6_27 | |
1367 | + ret = __blk_end_request( | |
1368 | + comp_req->req, | |
1369 | + (!comp_req->request.Status ? 0 : -EIO), | |
1370 | + comp_req->sector_count * blkdev->sector_size); | |
1371 | +#else | |
1372 | + ret = end_that_request_first(comp_req->req, !comp_req->request.Status, (comp_req->sector_count * (blkdev->sector_size >> 9))); | |
1373 | +#endif | |
1374 | + ASSERT(ret != 0); | |
1375 | + } | |
1376 | + | |
1377 | + kmem_cache_free(blkdev->request_pool, comp_req); | |
1378 | + } | |
1379 | + | |
1380 | + DPRINT_DBG(BLKVSC_DRV, "cancelling pending request - %p\n", pend_req); | |
1381 | + | |
1382 | + list_del(&pend_req->pend_entry); | |
1383 | + | |
1384 | + list_del(&pend_req->req_entry); | |
1385 | + | |
1386 | + if (comp_req->req) | |
1387 | + { | |
1388 | +#ifdef KERNEL_2_6_27 | |
1389 | + if (!__blk_end_request( | |
1390 | + pend_req->req, | |
1391 | + -EIO, | |
1392 | + pend_req->sector_count * blkdev->sector_size)) | |
1393 | + { | |
1394 | + //All the sectors have been xferred ie the request is done | |
1395 | + DPRINT_DBG(BLKVSC_DRV, "blkvsc_cancel_pending_reqs() - req %p COMPLETED\n", pend_req->req); | |
1396 | + kmem_cache_free(blkdev->request_pool, pend_req->group); | |
1397 | + } | |
1398 | +#else | |
1399 | + if (!end_that_request_first(pend_req->req, 0, (pend_req->sector_count * (blkdev->sector_size >> 9)))) | |
1400 | + { | |
1401 | + //All the sectors have been xferred ie the request is done | |
1402 | + DPRINT_DBG(BLKVSC_DRV, "blkvsc_cancel_pending_reqs() - req %p COMPLETED\n", pend_req->req); | |
1403 | + | |
1404 | + end_that_request_last(pend_req->req, 0); | |
1405 | + | |
1406 | + kmem_cache_free(blkdev->request_pool, pend_req->group); | |
1407 | + } | |
1408 | +#endif | |
1409 | + } | |
1410 | + | |
1411 | + kmem_cache_free(blkdev->request_pool, pend_req); | |
1412 | + } | |
1413 | + | |
1414 | + return ret; | |
1415 | +} | |
1416 | + | |
1417 | +static int blkvsc_do_pending_reqs(struct block_device_context *blkdev) | |
1418 | +{ | |
1419 | + struct blkvsc_request *pend_req, *tmp; | |
1420 | + int ret=0; | |
1421 | + | |
1422 | + // Flush the pending list first | |
1423 | + list_for_each_entry_safe(pend_req, tmp, &blkdev->pending_list, pend_entry) | |
1424 | + { | |
1425 | + DPRINT_DBG(BLKVSC_DRV, "working off pending_list - %p\n", pend_req); | |
1426 | + | |
1427 | + ret = blkvsc_submit_request(pend_req, blkvsc_request_completion); | |
1428 | + if (ret != 0) | |
1429 | + { | |
1430 | + break; | |
1431 | + } | |
1432 | + else | |
1433 | + { | |
1434 | + list_del(&pend_req->pend_entry); | |
1435 | + } | |
1436 | + } | |
1437 | + | |
1438 | + return ret; | |
1439 | +} | |
1440 | + | |
1441 | +static void blkvsc_request(struct request_queue *queue) | |
1442 | +{ | |
1443 | + struct block_device_context *blkdev = NULL; | |
1444 | + struct request *req; | |
1445 | + int ret=0; | |
1446 | + | |
1447 | + DPRINT_DBG(BLKVSC_DRV, "- enter \n"); | |
1448 | + while ((req = elv_next_request(queue)) != NULL) | |
1449 | + { | |
1450 | + DPRINT_DBG(BLKVSC_DRV, "- req %p\n", req); | |
1451 | + | |
1452 | + blkdev = req->rq_disk->private_data; | |
1453 | + if (blkdev->shutting_down || !blk_fs_request(req) || blkdev->media_not_present) { | |
1454 | + end_request(req, 0); | |
1455 | + continue; | |
1456 | + } | |
1457 | + | |
1458 | + ret = blkvsc_do_pending_reqs(blkdev); | |
1459 | + | |
1460 | + if (ret != 0) | |
1461 | + { | |
1462 | + DPRINT_DBG(BLKVSC_DRV, "- stop queue - pending_list not empty\n"); | |
1463 | + blk_stop_queue(queue); | |
1464 | + break; | |
1465 | + } | |
1466 | + | |
1467 | + blkdev_dequeue_request(req); | |
1468 | + | |
1469 | + ret = blkvsc_do_request(blkdev, req); | |
1470 | + if (ret > 0) | |
1471 | + { | |
1472 | + DPRINT_DBG(BLKVSC_DRV, "- stop queue - no room\n"); | |
1473 | + blk_stop_queue(queue); | |
1474 | + break; | |
1475 | + } | |
1476 | + else if (ret < 0) | |
1477 | + { | |
1478 | + DPRINT_DBG(BLKVSC_DRV, "- stop queue - no mem\n"); | |
1479 | + blk_requeue_request(queue, req); | |
1480 | + blk_stop_queue(queue); | |
1481 | + break; | |
1482 | + } | |
1483 | + } | |
1484 | +} | |
1485 | + | |
1486 | +static int blkvsc_open(struct inode *inode, struct file *filep) | |
1487 | +{ | |
1488 | + struct block_device_context *blkdev = inode->i_bdev->bd_disk->private_data; | |
1489 | + | |
1490 | + DPRINT_DBG(BLKVSC_DRV, "- users %d disk %s\n", blkdev->users, blkdev->gd->disk_name); | |
1491 | + | |
1492 | + spin_lock(&blkdev->lock); | |
1493 | + | |
1494 | + if (!blkdev->users && blkdev->device_type == DVD_TYPE) | |
1495 | + { | |
1496 | + spin_unlock(&blkdev->lock); | |
1497 | + check_disk_change(inode->i_bdev); | |
1498 | + spin_lock(&blkdev->lock); | |
1499 | + } | |
1500 | + | |
1501 | + blkdev->users++; | |
1502 | + | |
1503 | + spin_unlock(&blkdev->lock); | |
1504 | + return 0; | |
1505 | +} | |
1506 | + | |
1507 | +static int blkvsc_release(struct inode *inode, struct file *filep) | |
1508 | +{ | |
1509 | + struct block_device_context *blkdev = inode->i_bdev->bd_disk->private_data; | |
1510 | + | |
1511 | + DPRINT_DBG(BLKVSC_DRV, "- users %d disk %s\n", blkdev->users, blkdev->gd->disk_name); | |
1512 | + | |
1513 | + spin_lock(&blkdev->lock); | |
1514 | + if (blkdev->users == 1) | |
1515 | + { | |
1516 | + spin_unlock(&blkdev->lock); | |
1517 | + blkvsc_do_flush(blkdev); | |
1518 | + spin_lock(&blkdev->lock); | |
1519 | + } | |
1520 | + | |
1521 | + blkdev->users--; | |
1522 | + | |
1523 | + spin_unlock(&blkdev->lock); | |
1524 | + return 0; | |
1525 | +} | |
1526 | + | |
1527 | +static int blkvsc_media_changed(struct gendisk *gd) | |
1528 | +{ | |
1529 | + DPRINT_DBG(BLKVSC_DRV, "- enter\n"); | |
1530 | + | |
1531 | + return 1; | |
1532 | +} | |
1533 | + | |
1534 | +static int blkvsc_revalidate_disk(struct gendisk *gd) | |
1535 | +{ | |
1536 | + struct block_device_context *blkdev = gd->private_data; | |
1537 | + | |
1538 | + DPRINT_DBG(BLKVSC_DRV, "- enter\n"); | |
1539 | + | |
1540 | + if (blkdev->device_type == DVD_TYPE) | |
1541 | + { | |
1542 | + blkvsc_do_read_capacity(blkdev); | |
1543 | + set_capacity(blkdev->gd, blkdev->capacity * (blkdev->sector_size/512)); | |
1544 | + blk_queue_hardsect_size(gd->queue, blkdev->sector_size); | |
1545 | + } | |
1546 | + return 0; | |
1547 | +} | |
1548 | + | |
1549 | +int blkvsc_getgeo(struct block_device *bd, struct hd_geometry *hg) | |
1550 | +{ | |
1551 | + sector_t total_sectors = get_capacity(bd->bd_disk); | |
1552 | + sector_t cylinder_times_heads=0; | |
1553 | + sector_t temp=0; | |
1554 | + | |
1555 | + int sectors_per_track=0; | |
1556 | + int heads=0; | |
1557 | + int cylinders=0; | |
1558 | + int rem=0; | |
1559 | + | |
1560 | + if (total_sectors > (65535 * 16 * 255)) { | |
1561 | + total_sectors = (65535 * 16 * 255); | |
1562 | + } | |
1563 | + | |
1564 | + if (total_sectors >= (65535 * 16 * 63)) { | |
1565 | + sectors_per_track = 255; | |
1566 | + heads = 16; | |
1567 | + | |
1568 | + cylinder_times_heads = total_sectors; | |
1569 | + rem = sector_div(cylinder_times_heads, sectors_per_track); // sector_div stores the quotient in cylinder_times_heads | |
1570 | + } | |
1571 | + else | |
1572 | + { | |
1573 | + sectors_per_track = 17; | |
1574 | + | |
1575 | + cylinder_times_heads = total_sectors; | |
1576 | + rem = sector_div(cylinder_times_heads, sectors_per_track); // sector_div stores the quotient in cylinder_times_heads | |
1577 | + | |
1578 | + temp = cylinder_times_heads + 1023; | |
1579 | + rem = sector_div(temp, 1024); // sector_div stores the quotient in temp | |
1580 | + | |
1581 | + heads = temp; | |
1582 | + | |
1583 | + if (heads < 4) { | |
1584 | + heads = 4; | |
1585 | + } | |
1586 | + | |
1587 | + if (cylinder_times_heads >= (heads * 1024) || (heads > 16)) { | |
1588 | + sectors_per_track = 31; | |
1589 | + heads = 16; | |
1590 | + | |
1591 | + cylinder_times_heads = total_sectors; | |
1592 | + rem = sector_div(cylinder_times_heads, sectors_per_track); // sector_div stores the quotient in cylinder_times_heads | |
1593 | + } | |
1594 | + | |
1595 | + if (cylinder_times_heads >= (heads * 1024)) { | |
1596 | + sectors_per_track = 63; | |
1597 | + heads = 16; | |
1598 | + | |
1599 | + cylinder_times_heads = total_sectors; | |
1600 | + rem = sector_div(cylinder_times_heads, sectors_per_track); // sector_div stores the quotient in cylinder_times_heads | |
1601 | + } | |
1602 | + } | |
1603 | + | |
1604 | + temp = cylinder_times_heads; | |
1605 | + rem = sector_div(temp, heads); // sector_div stores the quotient in temp | |
1606 | + cylinders = temp; | |
1607 | + | |
1608 | + hg->heads = heads; | |
1609 | + hg->sectors = sectors_per_track; | |
1610 | + hg->cylinders = cylinders; | |
1611 | + | |
1612 | + DPRINT_INFO(BLKVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads, sectors_per_track); | |
1613 | + | |
1614 | + return 0; | |
1615 | +} | |
1616 | + | |
1617 | +static int blkvsc_ioctl(struct inode *inode, struct file *filep, unsigned cmd, unsigned long arg) | |
1618 | +{ | |
1619 | + struct block_device *bd = inode->i_bdev; | |
1620 | + struct block_device_context *blkdev = bd->bd_disk->private_data; | |
1621 | + int ret=0; | |
1622 | + | |
1623 | + switch (cmd) | |
1624 | + { | |
1625 | + // TODO: I think there is certain format for HDIO_GET_IDENTITY rather than just | |
1626 | + // a GUID. Commented it out for now. | |
1627 | + /*case HDIO_GET_IDENTITY: | |
1628 | + DPRINT_INFO(BLKVSC_DRV, "HDIO_GET_IDENTITY\n"); | |
1629 | + | |
1630 | + if (copy_to_user((void __user *)arg, blkdev->device_id, blkdev->device_id_len)) | |
1631 | + { | |
1632 | + ret = -EFAULT; | |
1633 | + } | |
1634 | + | |
1635 | + break;*/ | |
1636 | + default: | |
1637 | + ret = -EINVAL; | |
1638 | + break; | |
1639 | + } | |
1640 | + | |
1641 | + return ret; | |
1642 | +} | |
1643 | + | |
1644 | + | |
1645 | +MODULE_LICENSE("GPL"); | |
1646 | + | |
1647 | +static int __init blkvsc_init(void) | |
1648 | +{ | |
1649 | + int ret; | |
1650 | + | |
1651 | + ASSERT(sizeof(sector_t) == 8); // Make sure CONFIG_LBD is set | |
1652 | + | |
1653 | + DPRINT_ENTER(BLKVSC_DRV); | |
1654 | + | |
1655 | + DPRINT_INFO(BLKVSC_DRV, "Blkvsc initializing...."); | |
1656 | + | |
1657 | + ret = blkvsc_drv_init(BlkVscInitialize); | |
1658 | + | |
1659 | + DPRINT_EXIT(BLKVSC_DRV); | |
1660 | + | |
1661 | + return ret; | |
1662 | +} | |
1663 | + | |
1664 | +static void __exit blkvsc_exit(void) | |
1665 | +{ | |
1666 | + DPRINT_ENTER(BLKVSC_DRV); | |
1667 | + | |
1668 | + blkvsc_drv_exit(); | |
1669 | + | |
1670 | + DPRINT_ENTER(BLKVSC_DRV); | |
1671 | +} | |
1672 | + | |
1673 | +module_param(blkvsc_ringbuffer_size, int, S_IRUGO); | |
1674 | + | |
1675 | +module_init(blkvsc_init); | |
1676 | +module_exit(blkvsc_exit); | |
1677 | + | |
1678 | +// eof |