blob: aa1a3d5a3e2bc3f202bb695da2624f4d8cfd03b5 [file] [log] [blame]
Rusty Russelle467cde2007-10-22 11:03:38 +10001//#define DEBUG
2#include <linux/spinlock.h>
3#include <linux/blkdev.h>
4#include <linux/hdreg.h>
5#include <linux/virtio.h>
6#include <linux/virtio_blk.h>
Jens Axboe3d1266c2007-10-24 13:21:21 +02007#include <linux/scatterlist.h>
8
Christian Borntraeger4f3bf192008-01-31 15:53:53 +01009#define PART_BITS 4
Rusty Russelle467cde2007-10-22 11:03:38 +100010
Christian Borntraegerd50ed902008-02-01 09:05:00 +010011static int major, index;
Christian Borntraeger4f3bf192008-01-31 15:53:53 +010012
Rusty Russelle467cde2007-10-22 11:03:38 +100013struct virtio_blk
14{
15 spinlock_t lock;
16
17 struct virtio_device *vdev;
18 struct virtqueue *vq;
19
20 /* The disk structure for the kernel. */
21 struct gendisk *disk;
22
23 /* Request tracking. */
24 struct list_head reqs;
25
26 mempool_t *pool;
27
Rusty Russell0864b792008-12-30 09:26:05 -060028 /* What host tells us, plus 2 for header & tailer. */
29 unsigned int sg_elems;
30
Rusty Russelle467cde2007-10-22 11:03:38 +100031 /* Scatterlist: can be too big for stack. */
Rusty Russell0864b792008-12-30 09:26:05 -060032 struct scatterlist sg[/*sg_elems*/];
Rusty Russelle467cde2007-10-22 11:03:38 +100033};
34
35struct virtblk_req
36{
37 struct list_head list;
38 struct request *req;
39 struct virtio_blk_outhdr out_hdr;
Hannes Reinecke1cde26f2009-05-18 14:41:30 +020040 struct virtio_scsi_inhdr in_hdr;
Rusty Russellcb38fa22008-05-02 21:50:45 -050041 u8 status;
Rusty Russelle467cde2007-10-22 11:03:38 +100042};
43
Rusty Russell18445c42008-02-04 23:49:57 -050044static void blk_done(struct virtqueue *vq)
Rusty Russelle467cde2007-10-22 11:03:38 +100045{
46 struct virtio_blk *vblk = vq->vdev->priv;
47 struct virtblk_req *vbr;
48 unsigned int len;
49 unsigned long flags;
50
51 spin_lock_irqsave(&vblk->lock, flags);
52 while ((vbr = vblk->vq->vq_ops->get_buf(vblk->vq, &len)) != NULL) {
Kiyoshi Ueda83169822008-10-01 10:11:20 -040053 int error;
Hannes Reinecke1cde26f2009-05-18 14:41:30 +020054
Rusty Russellcb38fa22008-05-02 21:50:45 -050055 switch (vbr->status) {
Rusty Russelle467cde2007-10-22 11:03:38 +100056 case VIRTIO_BLK_S_OK:
Kiyoshi Ueda83169822008-10-01 10:11:20 -040057 error = 0;
Rusty Russelle467cde2007-10-22 11:03:38 +100058 break;
59 case VIRTIO_BLK_S_UNSUPP:
Kiyoshi Ueda83169822008-10-01 10:11:20 -040060 error = -ENOTTY;
Rusty Russelle467cde2007-10-22 11:03:38 +100061 break;
62 default:
Kiyoshi Ueda83169822008-10-01 10:11:20 -040063 error = -EIO;
Rusty Russelle467cde2007-10-22 11:03:38 +100064 break;
65 }
66
Hannes Reinecke1cde26f2009-05-18 14:41:30 +020067 if (blk_pc_request(vbr->req)) {
68 vbr->req->resid_len = vbr->in_hdr.residual;
69 vbr->req->sense_len = vbr->in_hdr.sense_len;
70 vbr->req->errors = vbr->in_hdr.errors;
71 }
72
Tejun Heo40cbbb72009-04-23 11:05:19 +090073 __blk_end_request_all(vbr->req, error);
Rusty Russelle467cde2007-10-22 11:03:38 +100074 list_del(&vbr->list);
75 mempool_free(vbr, vblk->pool);
76 }
77 /* In case queue is stopped waiting for more buffers. */
78 blk_start_queue(vblk->disk->queue);
79 spin_unlock_irqrestore(&vblk->lock, flags);
Rusty Russelle467cde2007-10-22 11:03:38 +100080}
81
82static bool do_req(struct request_queue *q, struct virtio_blk *vblk,
83 struct request *req)
84{
Hannes Reinecke1cde26f2009-05-18 14:41:30 +020085 unsigned long num, out = 0, in = 0;
Rusty Russelle467cde2007-10-22 11:03:38 +100086 struct virtblk_req *vbr;
87
88 vbr = mempool_alloc(vblk->pool, GFP_ATOMIC);
89 if (!vbr)
90 /* When another request finishes we'll try again. */
91 return false;
92
93 vbr->req = req;
94 if (blk_fs_request(vbr->req)) {
95 vbr->out_hdr.type = 0;
Tejun Heo83096eb2009-05-07 22:24:39 +090096 vbr->out_hdr.sector = blk_rq_pos(vbr->req);
Fernando Luis Vázquez Cao766ca442008-08-14 09:59:13 +020097 vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);
Rusty Russelle467cde2007-10-22 11:03:38 +100098 } else if (blk_pc_request(vbr->req)) {
99 vbr->out_hdr.type = VIRTIO_BLK_T_SCSI_CMD;
100 vbr->out_hdr.sector = 0;
Fernando Luis Vázquez Cao766ca442008-08-14 09:59:13 +0200101 vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);
Rusty Russelle467cde2007-10-22 11:03:38 +1000102 } else {
103 /* We don't put anything else in the queue. */
104 BUG();
105 }
106
107 if (blk_barrier_rq(vbr->req))
108 vbr->out_hdr.type |= VIRTIO_BLK_T_BARRIER;
109
Hannes Reinecke1cde26f2009-05-18 14:41:30 +0200110 sg_set_buf(&vblk->sg[out++], &vbr->out_hdr, sizeof(vbr->out_hdr));
Rusty Russelle467cde2007-10-22 11:03:38 +1000111
Hannes Reinecke1cde26f2009-05-18 14:41:30 +0200112 /*
113 * If this is a packet command we need a couple of additional headers.
114 * Behind the normal outhdr we put a segment with the scsi command
115 * block, and before the normal inhdr we put the sense data and the
116 * inhdr with additional status information before the normal inhdr.
117 */
118 if (blk_pc_request(vbr->req))
119 sg_set_buf(&vblk->sg[out++], vbr->req->cmd, vbr->req->cmd_len);
120
121 num = blk_rq_map_sg(q, vbr->req, vblk->sg + out);
122
123 if (blk_pc_request(vbr->req)) {
124 sg_set_buf(&vblk->sg[num + out + in++], vbr->req->sense, 96);
125 sg_set_buf(&vblk->sg[num + out + in++], &vbr->in_hdr,
126 sizeof(vbr->in_hdr));
127 }
128
129 sg_set_buf(&vblk->sg[num + out + in++], &vbr->status,
130 sizeof(vbr->status));
131
132 if (num) {
133 if (rq_data_dir(vbr->req) == WRITE) {
134 vbr->out_hdr.type |= VIRTIO_BLK_T_OUT;
135 out += num;
136 } else {
137 vbr->out_hdr.type |= VIRTIO_BLK_T_IN;
138 in += num;
139 }
Rusty Russelle467cde2007-10-22 11:03:38 +1000140 }
141
142 if (vblk->vq->vq_ops->add_buf(vblk->vq, vblk->sg, out, in, vbr)) {
143 mempool_free(vbr, vblk->pool);
144 return false;
145 }
146
147 list_add_tail(&vbr->list, &vblk->reqs);
148 return true;
149}
150
151static void do_virtblk_request(struct request_queue *q)
152{
Christoph Hellwig6c3b46f2009-05-18 14:38:28 +0200153 struct virtio_blk *vblk = q->queuedata;
Rusty Russelle467cde2007-10-22 11:03:38 +1000154 struct request *req;
155 unsigned int issued = 0;
156
Tejun Heo9934c8c2009-05-08 11:54:16 +0900157 while ((req = blk_peek_request(q)) != NULL) {
Rusty Russell0864b792008-12-30 09:26:05 -0600158 BUG_ON(req->nr_phys_segments + 2 > vblk->sg_elems);
Rusty Russelle467cde2007-10-22 11:03:38 +1000159
160 /* If this request fails, stop queue and wait for something to
161 finish to restart it. */
162 if (!do_req(q, vblk, req)) {
163 blk_stop_queue(q);
164 break;
165 }
Tejun Heo9934c8c2009-05-08 11:54:16 +0900166 blk_start_request(req);
Rusty Russelle467cde2007-10-22 11:03:38 +1000167 issued++;
168 }
169
170 if (issued)
171 vblk->vq->vq_ops->kick(vblk->vq);
172}
173
john cooper1d589bb2009-06-09 14:41:40 +0200174/* return ATA identify data
175 */
176static int virtblk_identify(struct gendisk *disk, void *argp)
177{
178 struct virtio_blk *vblk = disk->private_data;
179 void *opaque;
180 int err = -ENOMEM;
181
182 opaque = kmalloc(VIRTIO_BLK_ID_BYTES, GFP_KERNEL);
183 if (!opaque)
184 goto out;
185
186 err = virtio_config_buf(vblk->vdev, VIRTIO_BLK_F_IDENTIFY,
187 offsetof(struct virtio_blk_config, identify), opaque,
188 VIRTIO_BLK_ID_BYTES);
189
190 if (err)
191 goto out_kfree;
192
193 if (copy_to_user(argp, opaque, VIRTIO_BLK_ID_BYTES))
194 err = -EFAULT;
195
196out_kfree:
197 kfree(opaque);
198out:
199 return err;
200}
201
Al Viro4e109852008-03-02 10:22:33 -0500202static int virtblk_ioctl(struct block_device *bdev, fmode_t mode,
Rusty Russelle467cde2007-10-22 11:03:38 +1000203 unsigned cmd, unsigned long data)
204{
Hannes Reinecke1cde26f2009-05-18 14:41:30 +0200205 struct gendisk *disk = bdev->bd_disk;
206 struct virtio_blk *vblk = disk->private_data;
john cooper1d589bb2009-06-09 14:41:40 +0200207 void __user *argp = (void __user *)data;
208
209 if (cmd == HDIO_GET_IDENTITY)
210 return virtblk_identify(disk, argp);
Hannes Reinecke1cde26f2009-05-18 14:41:30 +0200211
212 /*
213 * Only allow the generic SCSI ioctls if the host can support it.
214 */
215 if (!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_SCSI))
Christoph Hellwigd9ecdea2009-06-20 21:29:41 +0200216 return -ENOTTY;
Hannes Reinecke1cde26f2009-05-18 14:41:30 +0200217
john cooper1d589bb2009-06-09 14:41:40 +0200218 return scsi_cmd_ioctl(disk->queue, disk, mode, cmd, argp);
Rusty Russelle467cde2007-10-22 11:03:38 +1000219}
220
Christian Borntraeger135da0b2008-01-23 17:56:50 +0100221/* We provide getgeo only to please some old bootloader/partitioning tools */
222static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo)
223{
Ryan Harper48e40432008-04-16 13:56:37 -0500224 struct virtio_blk *vblk = bd->bd_disk->private_data;
225 struct virtio_blk_geometry vgeo;
226 int err;
227
228 /* see if the host passed in geometry config */
229 err = virtio_config_val(vblk->vdev, VIRTIO_BLK_F_GEOMETRY,
230 offsetof(struct virtio_blk_config, geometry),
231 &vgeo);
232
233 if (!err) {
234 geo->heads = vgeo.heads;
235 geo->sectors = vgeo.sectors;
236 geo->cylinders = vgeo.cylinders;
237 } else {
238 /* some standard values, similar to sd */
239 geo->heads = 1 << 6;
240 geo->sectors = 1 << 5;
241 geo->cylinders = get_capacity(bd->bd_disk) >> 11;
242 }
Christian Borntraeger135da0b2008-01-23 17:56:50 +0100243 return 0;
244}
245
Rusty Russelle467cde2007-10-22 11:03:38 +1000246static struct block_device_operations virtblk_fops = {
Al Viro4e109852008-03-02 10:22:33 -0500247 .locked_ioctl = virtblk_ioctl,
Christian Borntraeger135da0b2008-01-23 17:56:50 +0100248 .owner = THIS_MODULE,
249 .getgeo = virtblk_getgeo,
Rusty Russelle467cde2007-10-22 11:03:38 +1000250};
251
Christian Borntraegerd50ed902008-02-01 09:05:00 +0100252static int index_to_minor(int index)
253{
254 return index << PART_BITS;
255}
256
Mike Frysinger98e94442009-05-18 03:39:09 -0400257static int __devinit virtblk_probe(struct virtio_device *vdev)
Rusty Russelle467cde2007-10-22 11:03:38 +1000258{
259 struct virtio_blk *vblk;
Christian Borntraeger4f3bf192008-01-31 15:53:53 +0100260 int err;
Rusty Russelle467cde2007-10-22 11:03:38 +1000261 u64 cap;
262 u32 v;
Rusty Russell0864b792008-12-30 09:26:05 -0600263 u32 blk_size, sg_elems;
Rusty Russelle467cde2007-10-22 11:03:38 +1000264
Christian Borntraegerd50ed902008-02-01 09:05:00 +0100265 if (index_to_minor(index) >= 1 << MINORBITS)
Christian Borntraeger4f3bf192008-01-31 15:53:53 +0100266 return -ENOSPC;
267
Rusty Russell0864b792008-12-30 09:26:05 -0600268 /* We need to know how many segments before we allocate. */
269 err = virtio_config_val(vdev, VIRTIO_BLK_F_SEG_MAX,
270 offsetof(struct virtio_blk_config, seg_max),
271 &sg_elems);
272 if (err)
273 sg_elems = 1;
274
275 /* We need an extra sg elements at head and tail. */
276 sg_elems += 2;
277 vdev->priv = vblk = kmalloc(sizeof(*vblk) +
278 sizeof(vblk->sg[0]) * sg_elems, GFP_KERNEL);
Rusty Russelle467cde2007-10-22 11:03:38 +1000279 if (!vblk) {
280 err = -ENOMEM;
281 goto out;
282 }
283
284 INIT_LIST_HEAD(&vblk->reqs);
285 spin_lock_init(&vblk->lock);
286 vblk->vdev = vdev;
Rusty Russell0864b792008-12-30 09:26:05 -0600287 vblk->sg_elems = sg_elems;
288 sg_init_table(vblk->sg, vblk->sg_elems);
Rusty Russelle467cde2007-10-22 11:03:38 +1000289
290 /* We expect one virtqueue, for output. */
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -0600291 vblk->vq = virtio_find_single_vq(vdev, blk_done, "requests");
Rusty Russelle467cde2007-10-22 11:03:38 +1000292 if (IS_ERR(vblk->vq)) {
293 err = PTR_ERR(vblk->vq);
294 goto out_free_vblk;
295 }
296
297 vblk->pool = mempool_create_kmalloc_pool(1,sizeof(struct virtblk_req));
298 if (!vblk->pool) {
299 err = -ENOMEM;
300 goto out_free_vq;
301 }
302
Rusty Russelle467cde2007-10-22 11:03:38 +1000303 /* FIXME: How many partitions? How long is a piece of string? */
Christian Borntraeger4f3bf192008-01-31 15:53:53 +0100304 vblk->disk = alloc_disk(1 << PART_BITS);
Rusty Russelle467cde2007-10-22 11:03:38 +1000305 if (!vblk->disk) {
306 err = -ENOMEM;
Christian Borntraeger4f3bf192008-01-31 15:53:53 +0100307 goto out_mempool;
Rusty Russelle467cde2007-10-22 11:03:38 +1000308 }
309
310 vblk->disk->queue = blk_init_queue(do_virtblk_request, &vblk->lock);
311 if (!vblk->disk->queue) {
312 err = -ENOMEM;
313 goto out_put_disk;
314 }
315
Christoph Hellwig6c3b46f2009-05-18 14:38:28 +0200316 vblk->disk->queue->queuedata = vblk;
Fernando Luis Vázquez Cao7d116b62008-10-27 18:45:15 +0900317 queue_flag_set_unlocked(QUEUE_FLAG_VIRT, vblk->disk->queue);
318
Christian Borntraegerd50ed902008-02-01 09:05:00 +0100319 if (index < 26) {
320 sprintf(vblk->disk->disk_name, "vd%c", 'a' + index % 26);
321 } else if (index < (26 + 1) * 26) {
322 sprintf(vblk->disk->disk_name, "vd%c%c",
323 'a' + index / 26 - 1, 'a' + index % 26);
324 } else {
325 const unsigned int m1 = (index / 26 - 1) / 26 - 1;
326 const unsigned int m2 = (index / 26 - 1) % 26;
327 const unsigned int m3 = index % 26;
328 sprintf(vblk->disk->disk_name, "vd%c%c%c",
329 'a' + m1, 'a' + m2, 'a' + m3);
330 }
331
Rusty Russelle467cde2007-10-22 11:03:38 +1000332 vblk->disk->major = major;
Christian Borntraegerd50ed902008-02-01 09:05:00 +0100333 vblk->disk->first_minor = index_to_minor(index);
Rusty Russelle467cde2007-10-22 11:03:38 +1000334 vblk->disk->private_data = vblk;
335 vblk->disk->fops = &virtblk_fops;
Jeremy Katzc4839342008-03-02 17:00:15 -0500336 vblk->disk->driverfs_dev = &vdev->dev;
Christian Borntraegerd50ed902008-02-01 09:05:00 +0100337 index++;
Christian Borntraeger4f3bf192008-01-31 15:53:53 +0100338
Rusty Russelle467cde2007-10-22 11:03:38 +1000339 /* If barriers are supported, tell block layer that queue is ordered */
Rusty Russellc45a6812008-05-02 21:50:50 -0500340 if (virtio_has_feature(vdev, VIRTIO_BLK_F_BARRIER))
Rusty Russelle467cde2007-10-22 11:03:38 +1000341 blk_queue_ordered(vblk->disk->queue, QUEUE_ORDERED_TAG, NULL);
342
Christian Borntraeger3ef53602008-05-16 11:17:03 +0200343 /* If disk is read-only in the host, the guest should obey */
344 if (virtio_has_feature(vdev, VIRTIO_BLK_F_RO))
345 set_disk_ro(vblk->disk, 1);
346
Rusty Russella586d4f2008-02-04 23:49:56 -0500347 /* Host must always specify the capacity. */
Rusty Russell72e61eb2008-05-02 21:50:49 -0500348 vdev->config->get(vdev, offsetof(struct virtio_blk_config, capacity),
349 &cap, sizeof(cap));
Rusty Russelle467cde2007-10-22 11:03:38 +1000350
351 /* If capacity is too big, truncate with warning. */
352 if ((sector_t)cap != cap) {
353 dev_warn(&vdev->dev, "Capacity %llu too large: truncating\n",
354 (unsigned long long)cap);
355 cap = (sector_t)-1;
356 }
357 set_capacity(vblk->disk, cap);
358
Rusty Russell0864b792008-12-30 09:26:05 -0600359 /* We can handle whatever the host told us to handle. */
360 blk_queue_max_phys_segments(vblk->disk->queue, vblk->sg_elems-2);
361 blk_queue_max_hw_segments(vblk->disk->queue, vblk->sg_elems-2);
362
Christoph Hellwig4eff3ca2009-07-17 21:47:45 -0600363 /* No need to bounce any requests */
364 blk_queue_bounce_limit(vblk->disk->queue, BLK_BOUNCE_ANY);
365
Rusty Russell4b7f7e22008-12-30 09:26:04 -0600366 /* No real sector limit. */
367 blk_queue_max_sectors(vblk->disk->queue, -1U);
368
Rusty Russella586d4f2008-02-04 23:49:56 -0500369 /* Host can optionally specify maximum segment size and number of
370 * segments. */
371 err = virtio_config_val(vdev, VIRTIO_BLK_F_SIZE_MAX,
372 offsetof(struct virtio_blk_config, size_max),
373 &v);
Rusty Russelle467cde2007-10-22 11:03:38 +1000374 if (!err)
375 blk_queue_max_segment_size(vblk->disk->queue, v);
Rusty Russell4b7f7e22008-12-30 09:26:04 -0600376 else
Randy Dunlapb194aee2008-11-26 13:15:50 -0800377 blk_queue_max_segment_size(vblk->disk->queue, -1U);
Rusty Russelle467cde2007-10-22 11:03:38 +1000378
Christian Borntraeger066f4d82008-05-29 11:08:26 +0200379 /* Host can optionally specify the block size of the device */
380 err = virtio_config_val(vdev, VIRTIO_BLK_F_BLK_SIZE,
381 offsetof(struct virtio_blk_config, blk_size),
382 &blk_size);
383 if (!err)
Martin K. Petersene1defc42009-05-22 17:17:49 -0400384 blk_queue_logical_block_size(vblk->disk->queue, blk_size);
Christian Borntraeger066f4d82008-05-29 11:08:26 +0200385
Rusty Russelle467cde2007-10-22 11:03:38 +1000386 add_disk(vblk->disk);
387 return 0;
388
389out_put_disk:
390 put_disk(vblk->disk);
Rusty Russelle467cde2007-10-22 11:03:38 +1000391out_mempool:
392 mempool_destroy(vblk->pool);
393out_free_vq:
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -0600394 vdev->config->del_vqs(vdev);
Rusty Russelle467cde2007-10-22 11:03:38 +1000395out_free_vblk:
396 kfree(vblk);
397out:
398 return err;
399}
400
Mike Frysinger98e94442009-05-18 03:39:09 -0400401static void __devexit virtblk_remove(struct virtio_device *vdev)
Rusty Russelle467cde2007-10-22 11:03:38 +1000402{
403 struct virtio_blk *vblk = vdev->priv;
Rusty Russelle467cde2007-10-22 11:03:38 +1000404
Rusty Russell6e5aa7e2008-02-04 23:50:03 -0500405 /* Nothing should be pending. */
Rusty Russelle467cde2007-10-22 11:03:38 +1000406 BUG_ON(!list_empty(&vblk->reqs));
Rusty Russell6e5aa7e2008-02-04 23:50:03 -0500407
408 /* Stop all the virtqueues. */
409 vdev->config->reset(vdev);
410
Chris Lalancetteac9d4632008-05-30 15:09:41 -0500411 del_gendisk(vblk->disk);
Rusty Russelle467cde2007-10-22 11:03:38 +1000412 blk_cleanup_queue(vblk->disk->queue);
413 put_disk(vblk->disk);
Rusty Russelle467cde2007-10-22 11:03:38 +1000414 mempool_destroy(vblk->pool);
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -0600415 vdev->config->del_vqs(vdev);
Rusty Russelle467cde2007-10-22 11:03:38 +1000416 kfree(vblk);
417}
418
419static struct virtio_device_id id_table[] = {
420 { VIRTIO_ID_BLOCK, VIRTIO_DEV_ANY_ID },
421 { 0 },
422};
423
Rusty Russellc45a6812008-05-02 21:50:50 -0500424static unsigned int features[] = {
425 VIRTIO_BLK_F_BARRIER, VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX,
Christian Borntraeger066f4d82008-05-29 11:08:26 +0200426 VIRTIO_BLK_F_GEOMETRY, VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE,
john cooper1d589bb2009-06-09 14:41:40 +0200427 VIRTIO_BLK_F_SCSI, VIRTIO_BLK_F_IDENTIFY
Rusty Russellc45a6812008-05-02 21:50:50 -0500428};
429
Rakib Mullick4fbfff762009-07-17 20:13:22 +0600430/*
431 * virtio_blk causes spurious section mismatch warning by
432 * simultaneously referring to a __devinit and a __devexit function.
433 * Use __refdata to avoid this warning.
434 */
435static struct virtio_driver __refdata virtio_blk = {
Rusty Russellc45a6812008-05-02 21:50:50 -0500436 .feature_table = features,
437 .feature_table_size = ARRAY_SIZE(features),
Rusty Russelle467cde2007-10-22 11:03:38 +1000438 .driver.name = KBUILD_MODNAME,
439 .driver.owner = THIS_MODULE,
440 .id_table = id_table,
441 .probe = virtblk_probe,
442 .remove = __devexit_p(virtblk_remove),
443};
444
445static int __init init(void)
446{
Christian Borntraeger4f3bf192008-01-31 15:53:53 +0100447 major = register_blkdev(0, "virtblk");
448 if (major < 0)
449 return major;
Rusty Russelle467cde2007-10-22 11:03:38 +1000450 return register_virtio_driver(&virtio_blk);
451}
452
453static void __exit fini(void)
454{
Christian Borntraeger4f3bf192008-01-31 15:53:53 +0100455 unregister_blkdev(major, "virtblk");
Rusty Russelle467cde2007-10-22 11:03:38 +1000456 unregister_virtio_driver(&virtio_blk);
457}
458module_init(init);
459module_exit(fini);
460
461MODULE_DEVICE_TABLE(virtio, id_table);
462MODULE_DESCRIPTION("Virtio block driver");
463MODULE_LICENSE("GPL");