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Commit | Line | Data |
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e467cde2 RR |
1 | //#define DEBUG |
2 | #include <linux/spinlock.h> | |
5a0e3ad6 | 3 | #include <linux/slab.h> |
e467cde2 RR |
4 | #include <linux/blkdev.h> |
5 | #include <linux/hdreg.h> | |
6 | #include <linux/virtio.h> | |
7 | #include <linux/virtio_blk.h> | |
3d1266c7 JA |
8 | #include <linux/scatterlist.h> |
9 | ||
4f3bf19c | 10 | #define PART_BITS 4 |
e467cde2 | 11 | |
d50ed907 | 12 | static int major, index; |
4f3bf19c | 13 | |
e467cde2 RR |
14 | struct virtio_blk |
15 | { | |
16 | spinlock_t lock; | |
17 | ||
18 | struct virtio_device *vdev; | |
19 | struct virtqueue *vq; | |
20 | ||
21 | /* The disk structure for the kernel. */ | |
22 | struct gendisk *disk; | |
23 | ||
24 | /* Request tracking. */ | |
25 | struct list_head reqs; | |
26 | ||
27 | mempool_t *pool; | |
28 | ||
0864b79a RR |
29 | /* What host tells us, plus 2 for header & tailer. */ |
30 | unsigned int sg_elems; | |
31 | ||
e467cde2 | 32 | /* Scatterlist: can be too big for stack. */ |
0864b79a | 33 | struct scatterlist sg[/*sg_elems*/]; |
e467cde2 RR |
34 | }; |
35 | ||
36 | struct virtblk_req | |
37 | { | |
38 | struct list_head list; | |
39 | struct request *req; | |
40 | struct virtio_blk_outhdr out_hdr; | |
1cde26f9 | 41 | struct virtio_scsi_inhdr in_hdr; |
cb38fa23 | 42 | u8 status; |
e467cde2 RR |
43 | }; |
44 | ||
18445c4d | 45 | static void blk_done(struct virtqueue *vq) |
e467cde2 RR |
46 | { |
47 | struct virtio_blk *vblk = vq->vdev->priv; | |
48 | struct virtblk_req *vbr; | |
49 | unsigned int len; | |
50 | unsigned long flags; | |
51 | ||
52 | spin_lock_irqsave(&vblk->lock, flags); | |
09ec6b69 | 53 | while ((vbr = virtqueue_get_buf(vblk->vq, &len)) != NULL) { |
8316982a | 54 | int error; |
1cde26f9 | 55 | |
cb38fa23 | 56 | switch (vbr->status) { |
e467cde2 | 57 | case VIRTIO_BLK_S_OK: |
8316982a | 58 | error = 0; |
e467cde2 RR |
59 | break; |
60 | case VIRTIO_BLK_S_UNSUPP: | |
8316982a | 61 | error = -ENOTTY; |
e467cde2 RR |
62 | break; |
63 | default: | |
8316982a | 64 | error = -EIO; |
e467cde2 RR |
65 | break; |
66 | } | |
67 | ||
1cde26f9 HR |
68 | if (blk_pc_request(vbr->req)) { |
69 | vbr->req->resid_len = vbr->in_hdr.residual; | |
70 | vbr->req->sense_len = vbr->in_hdr.sense_len; | |
71 | vbr->req->errors = vbr->in_hdr.errors; | |
72 | } | |
4cb2ea28 | 73 | if (blk_special_request(vbr->req)) |
74 | vbr->req->errors = (error != 0); | |
1cde26f9 | 75 | |
40cbbb78 | 76 | __blk_end_request_all(vbr->req, error); |
e467cde2 RR |
77 | list_del(&vbr->list); |
78 | mempool_free(vbr, vblk->pool); | |
79 | } | |
80 | /* In case queue is stopped waiting for more buffers. */ | |
81 | blk_start_queue(vblk->disk->queue); | |
82 | spin_unlock_irqrestore(&vblk->lock, flags); | |
e467cde2 RR |
83 | } |
84 | ||
85 | static bool do_req(struct request_queue *q, struct virtio_blk *vblk, | |
86 | struct request *req) | |
87 | { | |
1cde26f9 | 88 | unsigned long num, out = 0, in = 0; |
e467cde2 RR |
89 | struct virtblk_req *vbr; |
90 | ||
91 | vbr = mempool_alloc(vblk->pool, GFP_ATOMIC); | |
92 | if (!vbr) | |
93 | /* When another request finishes we'll try again. */ | |
94 | return false; | |
95 | ||
96 | vbr->req = req; | |
f1b0ef06 CH |
97 | switch (req->cmd_type) { |
98 | case REQ_TYPE_FS: | |
e467cde2 | 99 | vbr->out_hdr.type = 0; |
83096ebf | 100 | vbr->out_hdr.sector = blk_rq_pos(vbr->req); |
766ca442 | 101 | vbr->out_hdr.ioprio = req_get_ioprio(vbr->req); |
f1b0ef06 CH |
102 | break; |
103 | case REQ_TYPE_BLOCK_PC: | |
e467cde2 RR |
104 | vbr->out_hdr.type = VIRTIO_BLK_T_SCSI_CMD; |
105 | vbr->out_hdr.sector = 0; | |
766ca442 | 106 | vbr->out_hdr.ioprio = req_get_ioprio(vbr->req); |
f1b0ef06 | 107 | break; |
4cb2ea28 | 108 | case REQ_TYPE_SPECIAL: |
109 | vbr->out_hdr.type = VIRTIO_BLK_T_GET_ID; | |
110 | vbr->out_hdr.sector = 0; | |
111 | vbr->out_hdr.ioprio = req_get_ioprio(vbr->req); | |
112 | break; | |
f1b0ef06 CH |
113 | case REQ_TYPE_LINUX_BLOCK: |
114 | if (req->cmd[0] == REQ_LB_OP_FLUSH) { | |
115 | vbr->out_hdr.type = VIRTIO_BLK_T_FLUSH; | |
116 | vbr->out_hdr.sector = 0; | |
117 | vbr->out_hdr.ioprio = req_get_ioprio(vbr->req); | |
118 | break; | |
119 | } | |
120 | /*FALLTHRU*/ | |
121 | default: | |
e467cde2 RR |
122 | /* We don't put anything else in the queue. */ |
123 | BUG(); | |
124 | } | |
125 | ||
126 | if (blk_barrier_rq(vbr->req)) | |
127 | vbr->out_hdr.type |= VIRTIO_BLK_T_BARRIER; | |
128 | ||
1cde26f9 | 129 | sg_set_buf(&vblk->sg[out++], &vbr->out_hdr, sizeof(vbr->out_hdr)); |
e467cde2 | 130 | |
1cde26f9 HR |
131 | /* |
132 | * If this is a packet command we need a couple of additional headers. | |
133 | * Behind the normal outhdr we put a segment with the scsi command | |
134 | * block, and before the normal inhdr we put the sense data and the | |
135 | * inhdr with additional status information before the normal inhdr. | |
136 | */ | |
137 | if (blk_pc_request(vbr->req)) | |
138 | sg_set_buf(&vblk->sg[out++], vbr->req->cmd, vbr->req->cmd_len); | |
139 | ||
140 | num = blk_rq_map_sg(q, vbr->req, vblk->sg + out); | |
141 | ||
142 | if (blk_pc_request(vbr->req)) { | |
143 | sg_set_buf(&vblk->sg[num + out + in++], vbr->req->sense, 96); | |
144 | sg_set_buf(&vblk->sg[num + out + in++], &vbr->in_hdr, | |
145 | sizeof(vbr->in_hdr)); | |
146 | } | |
147 | ||
148 | sg_set_buf(&vblk->sg[num + out + in++], &vbr->status, | |
149 | sizeof(vbr->status)); | |
150 | ||
151 | if (num) { | |
152 | if (rq_data_dir(vbr->req) == WRITE) { | |
153 | vbr->out_hdr.type |= VIRTIO_BLK_T_OUT; | |
154 | out += num; | |
155 | } else { | |
156 | vbr->out_hdr.type |= VIRTIO_BLK_T_IN; | |
157 | in += num; | |
158 | } | |
e467cde2 RR |
159 | } |
160 | ||
09ec6b69 | 161 | if (virtqueue_add_buf(vblk->vq, vblk->sg, out, in, vbr) < 0) { |
e467cde2 RR |
162 | mempool_free(vbr, vblk->pool); |
163 | return false; | |
164 | } | |
165 | ||
166 | list_add_tail(&vbr->list, &vblk->reqs); | |
167 | return true; | |
168 | } | |
169 | ||
170 | static void do_virtblk_request(struct request_queue *q) | |
171 | { | |
6c3b46f7 | 172 | struct virtio_blk *vblk = q->queuedata; |
e467cde2 RR |
173 | struct request *req; |
174 | unsigned int issued = 0; | |
175 | ||
9934c8c0 | 176 | while ((req = blk_peek_request(q)) != NULL) { |
0864b79a | 177 | BUG_ON(req->nr_phys_segments + 2 > vblk->sg_elems); |
e467cde2 RR |
178 | |
179 | /* If this request fails, stop queue and wait for something to | |
180 | finish to restart it. */ | |
181 | if (!do_req(q, vblk, req)) { | |
182 | blk_stop_queue(q); | |
183 | break; | |
184 | } | |
9934c8c0 | 185 | blk_start_request(req); |
e467cde2 RR |
186 | issued++; |
187 | } | |
188 | ||
189 | if (issued) | |
09ec6b69 | 190 | virtqueue_kick(vblk->vq); |
e467cde2 RR |
191 | } |
192 | ||
f1b0ef06 CH |
193 | static void virtblk_prepare_flush(struct request_queue *q, struct request *req) |
194 | { | |
195 | req->cmd_type = REQ_TYPE_LINUX_BLOCK; | |
196 | req->cmd[0] = REQ_LB_OP_FLUSH; | |
197 | } | |
198 | ||
4cb2ea28 | 199 | /* return id (s/n) string for *disk to *id_str |
200 | */ | |
201 | static int virtblk_get_id(struct gendisk *disk, char *id_str) | |
202 | { | |
203 | struct virtio_blk *vblk = disk->private_data; | |
204 | struct request *req; | |
205 | struct bio *bio; | |
206 | ||
207 | bio = bio_map_kern(vblk->disk->queue, id_str, VIRTIO_BLK_ID_BYTES, | |
208 | GFP_KERNEL); | |
209 | if (IS_ERR(bio)) | |
210 | return PTR_ERR(bio); | |
211 | ||
212 | req = blk_make_request(vblk->disk->queue, bio, GFP_KERNEL); | |
213 | if (IS_ERR(req)) { | |
214 | bio_put(bio); | |
215 | return PTR_ERR(req); | |
216 | } | |
217 | ||
218 | req->cmd_type = REQ_TYPE_SPECIAL; | |
219 | return blk_execute_rq(vblk->disk->queue, vblk->disk, req, false); | |
220 | } | |
221 | ||
4e109852 | 222 | static int virtblk_ioctl(struct block_device *bdev, fmode_t mode, |
e467cde2 RR |
223 | unsigned cmd, unsigned long data) |
224 | { | |
1cde26f9 HR |
225 | struct gendisk *disk = bdev->bd_disk; |
226 | struct virtio_blk *vblk = disk->private_data; | |
227 | ||
bdb4a130 | 228 | if (cmd == 0x56424944) { /* 'VBID' */ |
234f2725 | 229 | void __user *usr_data = (void __user *)data; |
230 | char id_str[VIRTIO_BLK_ID_BYTES]; | |
231 | int err; | |
232 | ||
233 | err = virtblk_get_id(disk, id_str); | |
234 | if (!err && copy_to_user(usr_data, id_str, VIRTIO_BLK_ID_BYTES)) | |
235 | err = -EFAULT; | |
236 | return err; | |
237 | } | |
1cde26f9 HR |
238 | /* |
239 | * Only allow the generic SCSI ioctls if the host can support it. | |
240 | */ | |
241 | if (!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_SCSI)) | |
d9ecdea7 | 242 | return -ENOTTY; |
1cde26f9 | 243 | |
3225beab RR |
244 | return scsi_cmd_ioctl(disk->queue, disk, mode, cmd, |
245 | (void __user *)data); | |
e467cde2 RR |
246 | } |
247 | ||
135da0b0 CB |
248 | /* We provide getgeo only to please some old bootloader/partitioning tools */ |
249 | static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo) | |
250 | { | |
48e4043d RH |
251 | struct virtio_blk *vblk = bd->bd_disk->private_data; |
252 | struct virtio_blk_geometry vgeo; | |
253 | int err; | |
254 | ||
255 | /* see if the host passed in geometry config */ | |
256 | err = virtio_config_val(vblk->vdev, VIRTIO_BLK_F_GEOMETRY, | |
257 | offsetof(struct virtio_blk_config, geometry), | |
258 | &vgeo); | |
259 | ||
260 | if (!err) { | |
261 | geo->heads = vgeo.heads; | |
262 | geo->sectors = vgeo.sectors; | |
263 | geo->cylinders = vgeo.cylinders; | |
264 | } else { | |
265 | /* some standard values, similar to sd */ | |
266 | geo->heads = 1 << 6; | |
267 | geo->sectors = 1 << 5; | |
268 | geo->cylinders = get_capacity(bd->bd_disk) >> 11; | |
269 | } | |
135da0b0 CB |
270 | return 0; |
271 | } | |
272 | ||
83d5cde4 | 273 | static const struct block_device_operations virtblk_fops = { |
4e109852 | 274 | .locked_ioctl = virtblk_ioctl, |
135da0b0 CB |
275 | .owner = THIS_MODULE, |
276 | .getgeo = virtblk_getgeo, | |
e467cde2 RR |
277 | }; |
278 | ||
d50ed907 CB |
279 | static int index_to_minor(int index) |
280 | { | |
281 | return index << PART_BITS; | |
282 | } | |
283 | ||
98e94444 | 284 | static int __devinit virtblk_probe(struct virtio_device *vdev) |
e467cde2 RR |
285 | { |
286 | struct virtio_blk *vblk; | |
69740c8b | 287 | struct request_queue *q; |
4f3bf19c | 288 | int err; |
e467cde2 | 289 | u64 cap; |
69740c8b CH |
290 | u32 v, blk_size, sg_elems, opt_io_size; |
291 | u16 min_io_size; | |
292 | u8 physical_block_exp, alignment_offset; | |
e467cde2 | 293 | |
d50ed907 | 294 | if (index_to_minor(index) >= 1 << MINORBITS) |
4f3bf19c CB |
295 | return -ENOSPC; |
296 | ||
0864b79a RR |
297 | /* We need to know how many segments before we allocate. */ |
298 | err = virtio_config_val(vdev, VIRTIO_BLK_F_SEG_MAX, | |
299 | offsetof(struct virtio_blk_config, seg_max), | |
300 | &sg_elems); | |
a5b365a6 CH |
301 | |
302 | /* We need at least one SG element, whatever they say. */ | |
303 | if (err || !sg_elems) | |
0864b79a RR |
304 | sg_elems = 1; |
305 | ||
306 | /* We need an extra sg elements at head and tail. */ | |
307 | sg_elems += 2; | |
308 | vdev->priv = vblk = kmalloc(sizeof(*vblk) + | |
309 | sizeof(vblk->sg[0]) * sg_elems, GFP_KERNEL); | |
e467cde2 RR |
310 | if (!vblk) { |
311 | err = -ENOMEM; | |
312 | goto out; | |
313 | } | |
314 | ||
315 | INIT_LIST_HEAD(&vblk->reqs); | |
316 | spin_lock_init(&vblk->lock); | |
317 | vblk->vdev = vdev; | |
0864b79a RR |
318 | vblk->sg_elems = sg_elems; |
319 | sg_init_table(vblk->sg, vblk->sg_elems); | |
e467cde2 RR |
320 | |
321 | /* We expect one virtqueue, for output. */ | |
d2a7ddda | 322 | vblk->vq = virtio_find_single_vq(vdev, blk_done, "requests"); |
e467cde2 RR |
323 | if (IS_ERR(vblk->vq)) { |
324 | err = PTR_ERR(vblk->vq); | |
325 | goto out_free_vblk; | |
326 | } | |
327 | ||
328 | vblk->pool = mempool_create_kmalloc_pool(1,sizeof(struct virtblk_req)); | |
329 | if (!vblk->pool) { | |
330 | err = -ENOMEM; | |
331 | goto out_free_vq; | |
332 | } | |
333 | ||
e467cde2 | 334 | /* FIXME: How many partitions? How long is a piece of string? */ |
4f3bf19c | 335 | vblk->disk = alloc_disk(1 << PART_BITS); |
e467cde2 RR |
336 | if (!vblk->disk) { |
337 | err = -ENOMEM; | |
4f3bf19c | 338 | goto out_mempool; |
e467cde2 RR |
339 | } |
340 | ||
69740c8b CH |
341 | q = vblk->disk->queue = blk_init_queue(do_virtblk_request, &vblk->lock); |
342 | if (!q) { | |
e467cde2 RR |
343 | err = -ENOMEM; |
344 | goto out_put_disk; | |
345 | } | |
346 | ||
69740c8b | 347 | q->queuedata = vblk; |
7d116b62 | 348 | |
d50ed907 CB |
349 | if (index < 26) { |
350 | sprintf(vblk->disk->disk_name, "vd%c", 'a' + index % 26); | |
351 | } else if (index < (26 + 1) * 26) { | |
352 | sprintf(vblk->disk->disk_name, "vd%c%c", | |
353 | 'a' + index / 26 - 1, 'a' + index % 26); | |
354 | } else { | |
355 | const unsigned int m1 = (index / 26 - 1) / 26 - 1; | |
356 | const unsigned int m2 = (index / 26 - 1) % 26; | |
357 | const unsigned int m3 = index % 26; | |
358 | sprintf(vblk->disk->disk_name, "vd%c%c%c", | |
359 | 'a' + m1, 'a' + m2, 'a' + m3); | |
360 | } | |
361 | ||
e467cde2 | 362 | vblk->disk->major = major; |
d50ed907 | 363 | vblk->disk->first_minor = index_to_minor(index); |
e467cde2 RR |
364 | vblk->disk->private_data = vblk; |
365 | vblk->disk->fops = &virtblk_fops; | |
c4839346 | 366 | vblk->disk->driverfs_dev = &vdev->dev; |
d50ed907 | 367 | index++; |
4f3bf19c | 368 | |
e467cde2 | 369 | /* If barriers are supported, tell block layer that queue is ordered */ |
f1b0ef06 | 370 | if (virtio_has_feature(vdev, VIRTIO_BLK_F_FLUSH)) |
69740c8b | 371 | blk_queue_ordered(q, QUEUE_ORDERED_DRAIN_FLUSH, |
f1b0ef06 CH |
372 | virtblk_prepare_flush); |
373 | else if (virtio_has_feature(vdev, VIRTIO_BLK_F_BARRIER)) | |
69740c8b | 374 | blk_queue_ordered(q, QUEUE_ORDERED_TAG, NULL); |
e467cde2 | 375 | |
3ef53609 CB |
376 | /* If disk is read-only in the host, the guest should obey */ |
377 | if (virtio_has_feature(vdev, VIRTIO_BLK_F_RO)) | |
378 | set_disk_ro(vblk->disk, 1); | |
379 | ||
a586d4f6 | 380 | /* Host must always specify the capacity. */ |
72e61eb4 RR |
381 | vdev->config->get(vdev, offsetof(struct virtio_blk_config, capacity), |
382 | &cap, sizeof(cap)); | |
e467cde2 RR |
383 | |
384 | /* If capacity is too big, truncate with warning. */ | |
385 | if ((sector_t)cap != cap) { | |
386 | dev_warn(&vdev->dev, "Capacity %llu too large: truncating\n", | |
387 | (unsigned long long)cap); | |
388 | cap = (sector_t)-1; | |
389 | } | |
390 | set_capacity(vblk->disk, cap); | |
391 | ||
0864b79a | 392 | /* We can handle whatever the host told us to handle. */ |
ee714f2d | 393 | blk_queue_max_segments(q, vblk->sg_elems-2); |
0864b79a | 394 | |
4eff3cae | 395 | /* No need to bounce any requests */ |
69740c8b | 396 | blk_queue_bounce_limit(q, BLK_BOUNCE_ANY); |
4eff3cae | 397 | |
4b7f7e20 | 398 | /* No real sector limit. */ |
ee714f2d | 399 | blk_queue_max_hw_sectors(q, -1U); |
4b7f7e20 | 400 | |
a586d4f6 RR |
401 | /* Host can optionally specify maximum segment size and number of |
402 | * segments. */ | |
403 | err = virtio_config_val(vdev, VIRTIO_BLK_F_SIZE_MAX, | |
404 | offsetof(struct virtio_blk_config, size_max), | |
405 | &v); | |
e467cde2 | 406 | if (!err) |
69740c8b | 407 | blk_queue_max_segment_size(q, v); |
4b7f7e20 | 408 | else |
69740c8b | 409 | blk_queue_max_segment_size(q, -1U); |
e467cde2 | 410 | |
066f4d82 CB |
411 | /* Host can optionally specify the block size of the device */ |
412 | err = virtio_config_val(vdev, VIRTIO_BLK_F_BLK_SIZE, | |
413 | offsetof(struct virtio_blk_config, blk_size), | |
414 | &blk_size); | |
415 | if (!err) | |
69740c8b CH |
416 | blk_queue_logical_block_size(q, blk_size); |
417 | else | |
418 | blk_size = queue_logical_block_size(q); | |
419 | ||
420 | /* Use topology information if available */ | |
421 | err = virtio_config_val(vdev, VIRTIO_BLK_F_TOPOLOGY, | |
422 | offsetof(struct virtio_blk_config, physical_block_exp), | |
423 | &physical_block_exp); | |
424 | if (!err && physical_block_exp) | |
425 | blk_queue_physical_block_size(q, | |
426 | blk_size * (1 << physical_block_exp)); | |
427 | ||
428 | err = virtio_config_val(vdev, VIRTIO_BLK_F_TOPOLOGY, | |
429 | offsetof(struct virtio_blk_config, alignment_offset), | |
430 | &alignment_offset); | |
431 | if (!err && alignment_offset) | |
432 | blk_queue_alignment_offset(q, blk_size * alignment_offset); | |
433 | ||
434 | err = virtio_config_val(vdev, VIRTIO_BLK_F_TOPOLOGY, | |
435 | offsetof(struct virtio_blk_config, min_io_size), | |
436 | &min_io_size); | |
437 | if (!err && min_io_size) | |
438 | blk_queue_io_min(q, blk_size * min_io_size); | |
439 | ||
440 | err = virtio_config_val(vdev, VIRTIO_BLK_F_TOPOLOGY, | |
441 | offsetof(struct virtio_blk_config, opt_io_size), | |
442 | &opt_io_size); | |
443 | if (!err && opt_io_size) | |
444 | blk_queue_io_opt(q, blk_size * opt_io_size); | |
445 | ||
066f4d82 | 446 | |
e467cde2 RR |
447 | add_disk(vblk->disk); |
448 | return 0; | |
449 | ||
450 | out_put_disk: | |
451 | put_disk(vblk->disk); | |
e467cde2 RR |
452 | out_mempool: |
453 | mempool_destroy(vblk->pool); | |
454 | out_free_vq: | |
d2a7ddda | 455 | vdev->config->del_vqs(vdev); |
e467cde2 RR |
456 | out_free_vblk: |
457 | kfree(vblk); | |
458 | out: | |
459 | return err; | |
460 | } | |
461 | ||
98e94444 | 462 | static void __devexit virtblk_remove(struct virtio_device *vdev) |
e467cde2 RR |
463 | { |
464 | struct virtio_blk *vblk = vdev->priv; | |
e467cde2 | 465 | |
6e5aa7ef | 466 | /* Nothing should be pending. */ |
e467cde2 | 467 | BUG_ON(!list_empty(&vblk->reqs)); |
6e5aa7ef RR |
468 | |
469 | /* Stop all the virtqueues. */ | |
470 | vdev->config->reset(vdev); | |
471 | ||
ac9d463a | 472 | del_gendisk(vblk->disk); |
e467cde2 RR |
473 | blk_cleanup_queue(vblk->disk->queue); |
474 | put_disk(vblk->disk); | |
e467cde2 | 475 | mempool_destroy(vblk->pool); |
d2a7ddda | 476 | vdev->config->del_vqs(vdev); |
e467cde2 RR |
477 | kfree(vblk); |
478 | } | |
479 | ||
47483e25 | 480 | static const struct virtio_device_id id_table[] = { |
e467cde2 RR |
481 | { VIRTIO_ID_BLOCK, VIRTIO_DEV_ANY_ID }, |
482 | { 0 }, | |
483 | }; | |
484 | ||
c45a6816 RR |
485 | static unsigned int features[] = { |
486 | VIRTIO_BLK_F_BARRIER, VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, | |
066f4d82 | 487 | VIRTIO_BLK_F_GEOMETRY, VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE, |
69740c8b | 488 | VIRTIO_BLK_F_SCSI, VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY |
c45a6816 RR |
489 | }; |
490 | ||
4fbfff76 RM |
491 | /* |
492 | * virtio_blk causes spurious section mismatch warning by | |
493 | * simultaneously referring to a __devinit and a __devexit function. | |
494 | * Use __refdata to avoid this warning. | |
495 | */ | |
496 | static struct virtio_driver __refdata virtio_blk = { | |
c45a6816 RR |
497 | .feature_table = features, |
498 | .feature_table_size = ARRAY_SIZE(features), | |
e467cde2 RR |
499 | .driver.name = KBUILD_MODNAME, |
500 | .driver.owner = THIS_MODULE, | |
501 | .id_table = id_table, | |
502 | .probe = virtblk_probe, | |
503 | .remove = __devexit_p(virtblk_remove), | |
504 | }; | |
505 | ||
506 | static int __init init(void) | |
507 | { | |
4f3bf19c CB |
508 | major = register_blkdev(0, "virtblk"); |
509 | if (major < 0) | |
510 | return major; | |
e467cde2 RR |
511 | return register_virtio_driver(&virtio_blk); |
512 | } | |
513 | ||
514 | static void __exit fini(void) | |
515 | { | |
4f3bf19c | 516 | unregister_blkdev(major, "virtblk"); |
e467cde2 RR |
517 | unregister_virtio_driver(&virtio_blk); |
518 | } | |
519 | module_init(init); | |
520 | module_exit(fini); | |
521 | ||
522 | MODULE_DEVICE_TABLE(virtio, id_table); | |
523 | MODULE_DESCRIPTION("Virtio block driver"); | |
524 | MODULE_LICENSE("GPL"); |