Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 1 | /* |
| 2 | * The Guest 9p transport driver |
| 3 | * |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 4 | * This is a block based transport driver based on the lguest block driver |
| 5 | * code. |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 6 | * |
| 7 | */ |
| 8 | /* |
| 9 | * Copyright (C) 2007 Eric Van Hensbergen, IBM Corporation |
| 10 | * |
| 11 | * Based on virtio console driver |
| 12 | * Copyright (C) 2006, 2007 Rusty Russell, IBM Corporation |
| 13 | * |
| 14 | * This program is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU General Public License version 2 |
| 16 | * as published by the Free Software Foundation. |
| 17 | * |
| 18 | * This program is distributed in the hope that it will be useful, |
| 19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 21 | * GNU General Public License for more details. |
| 22 | * |
| 23 | * You should have received a copy of the GNU General Public License |
| 24 | * along with this program; if not, write to: |
| 25 | * Free Software Foundation |
| 26 | * 51 Franklin Street, Fifth Floor |
| 27 | * Boston, MA 02111-1301 USA |
| 28 | * |
| 29 | */ |
| 30 | |
| 31 | #include <linux/in.h> |
| 32 | #include <linux/module.h> |
| 33 | #include <linux/net.h> |
| 34 | #include <linux/ipv6.h> |
| 35 | #include <linux/errno.h> |
| 36 | #include <linux/kernel.h> |
| 37 | #include <linux/un.h> |
| 38 | #include <linux/uaccess.h> |
| 39 | #include <linux/inet.h> |
| 40 | #include <linux/idr.h> |
| 41 | #include <linux/file.h> |
| 42 | #include <net/9p/9p.h> |
| 43 | #include <linux/parser.h> |
| 44 | #include <net/9p/transport.h> |
| 45 | #include <linux/scatterlist.h> |
| 46 | #include <linux/virtio.h> |
| 47 | #include <linux/virtio_9p.h> |
| 48 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 49 | #define VIRTQUEUE_NUM 128 |
| 50 | |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 51 | /* a single mutex to manage channel initialization and attachment */ |
| 52 | static DECLARE_MUTEX(virtio_9p_lock); |
| 53 | /* global which tracks highest initialized channel */ |
| 54 | static int chan_index; |
| 55 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 56 | #define P9_INIT_MAXTAG 16 |
| 57 | |
| 58 | #define REQ_STATUS_IDLE 0 |
| 59 | #define REQ_STATUS_SENT 1 |
| 60 | #define REQ_STATUS_RCVD 2 |
| 61 | #define REQ_STATUS_FLSH 3 |
| 62 | |
| 63 | struct p9_req_t { |
| 64 | int status; |
| 65 | wait_queue_head_t *wq; |
| 66 | }; |
| 67 | |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 68 | /* We keep all per-channel information in a structure. |
| 69 | * This structure is allocated within the devices dev->mem space. |
| 70 | * A pointer to the structure will get put in the transport private. |
| 71 | */ |
| 72 | static struct virtio_chan { |
| 73 | bool initialized; /* channel is initialized */ |
| 74 | bool inuse; /* channel is in use */ |
| 75 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 76 | spinlock_t lock; |
| 77 | |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 78 | struct virtio_device *vdev; |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 79 | struct virtqueue *vq; |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 80 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 81 | struct p9_idpool *tagpool; |
| 82 | struct p9_req_t *reqs; |
| 83 | int max_tag; |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 84 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 85 | /* Scatterlist: can be too big for stack. */ |
| 86 | struct scatterlist sg[VIRTQUEUE_NUM]; |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 87 | } channels[MAX_9P_CHAN]; |
| 88 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 89 | /* Lookup requests by tag */ |
| 90 | static struct p9_req_t *p9_lookup_tag(struct virtio_chan *c, u16 tag) |
| 91 | { |
| 92 | /* This looks up the original request by tag so we know which |
| 93 | * buffer to read the data into */ |
| 94 | tag++; |
| 95 | |
| 96 | while (tag >= c->max_tag) { |
| 97 | int old_max = c->max_tag; |
| 98 | int count; |
| 99 | |
| 100 | if (c->max_tag) |
| 101 | c->max_tag *= 2; |
| 102 | else |
| 103 | c->max_tag = P9_INIT_MAXTAG; |
| 104 | |
| 105 | c->reqs = krealloc(c->reqs, sizeof(struct p9_req_t)*c->max_tag, |
| 106 | GFP_ATOMIC); |
| 107 | if (!c->reqs) { |
| 108 | printk(KERN_ERR "Couldn't grow tag array\n"); |
| 109 | BUG(); |
| 110 | } |
| 111 | for (count = old_max; count < c->max_tag; count++) { |
| 112 | c->reqs[count].status = REQ_STATUS_IDLE; |
Adrian Bunk | 15e29b8b | 2008-02-19 16:25:30 -0800 | [diff] [blame] | 113 | c->reqs[count].wq = kmalloc(sizeof(wait_queue_head_t), |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 114 | GFP_ATOMIC); |
| 115 | if (!c->reqs[count].wq) { |
| 116 | printk(KERN_ERR "Couldn't grow tag array\n"); |
| 117 | BUG(); |
| 118 | } |
| 119 | init_waitqueue_head(c->reqs[count].wq); |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | return &c->reqs[tag]; |
| 124 | } |
| 125 | |
| 126 | |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 127 | /* How many bytes left in this page. */ |
| 128 | static unsigned int rest_of_page(void *data) |
| 129 | { |
| 130 | return PAGE_SIZE - ((unsigned long)data % PAGE_SIZE); |
| 131 | } |
| 132 | |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 133 | static void p9_virtio_close(struct p9_trans *trans) |
| 134 | { |
| 135 | struct virtio_chan *chan = trans->priv; |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 136 | int count; |
| 137 | unsigned int flags; |
| 138 | |
| 139 | spin_lock_irqsave(&chan->lock, flags); |
| 140 | p9_idpool_destroy(chan->tagpool); |
| 141 | for (count = 0; count < chan->max_tag; count++) |
| 142 | kfree(chan->reqs[count].wq); |
| 143 | kfree(chan->reqs); |
| 144 | chan->max_tag = 0; |
| 145 | spin_unlock_irqrestore(&chan->lock, flags); |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 146 | |
| 147 | down(&virtio_9p_lock); |
| 148 | chan->inuse = false; |
| 149 | up(&virtio_9p_lock); |
| 150 | |
| 151 | kfree(trans); |
| 152 | } |
| 153 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 154 | static void req_done(struct virtqueue *vq) |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 155 | { |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 156 | struct virtio_chan *chan = vq->vdev->priv; |
| 157 | struct p9_fcall *rc; |
| 158 | unsigned int len; |
| 159 | unsigned long flags; |
| 160 | struct p9_req_t *req; |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 161 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 162 | spin_lock_irqsave(&chan->lock, flags); |
| 163 | while ((rc = chan->vq->vq_ops->get_buf(chan->vq, &len)) != NULL) { |
| 164 | req = p9_lookup_tag(chan, rc->tag); |
| 165 | req->status = REQ_STATUS_RCVD; |
| 166 | wake_up(req->wq); |
| 167 | } |
| 168 | /* In case queue is stopped waiting for more buffers. */ |
| 169 | spin_unlock_irqrestore(&chan->lock, flags); |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 170 | } |
| 171 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 172 | static int |
| 173 | pack_sg_list(struct scatterlist *sg, int start, int limit, char *data, |
| 174 | int count) |
| 175 | { |
| 176 | int s; |
| 177 | int index = start; |
| 178 | |
| 179 | while (count) { |
| 180 | s = rest_of_page(data); |
| 181 | if (s > count) |
| 182 | s = count; |
| 183 | sg_set_buf(&sg[index++], data, s); |
| 184 | count -= s; |
| 185 | data += s; |
Julia Lawall | d6584f3 | 2008-02-17 18:42:53 -0800 | [diff] [blame] | 186 | BUG_ON(index > limit); |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 187 | } |
| 188 | |
| 189 | return index-start; |
| 190 | } |
| 191 | |
| 192 | static int |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 193 | p9_virtio_rpc(struct p9_trans *t, struct p9_fcall *tc, struct p9_fcall **rc) |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 194 | { |
| 195 | int in, out; |
| 196 | int n, err, size; |
| 197 | struct virtio_chan *chan = t->priv; |
| 198 | char *rdata; |
| 199 | struct p9_req_t *req; |
| 200 | unsigned long flags; |
| 201 | |
| 202 | if (*rc == NULL) { |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 203 | *rc = kmalloc(sizeof(struct p9_fcall) + t->msize, GFP_KERNEL); |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 204 | if (!*rc) |
| 205 | return -ENOMEM; |
| 206 | } |
| 207 | |
| 208 | rdata = (char *)*rc+sizeof(struct p9_fcall); |
| 209 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 210 | n = P9_NOTAG; |
| 211 | if (tc->id != P9_TVERSION) { |
| 212 | n = p9_idpool_get(chan->tagpool); |
| 213 | if (n < 0) |
| 214 | return -ENOMEM; |
| 215 | } |
| 216 | |
Eric Van Hensbergen | 7c7d90f | 2008-02-06 19:25:07 -0600 | [diff] [blame] | 217 | spin_lock_irqsave(&chan->lock, flags); |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 218 | req = p9_lookup_tag(chan, n); |
| 219 | spin_unlock_irqrestore(&chan->lock, flags); |
| 220 | |
| 221 | p9_set_tag(tc, n); |
| 222 | |
| 223 | P9_DPRINTK(P9_DEBUG_TRANS, "9p debug: virtio rpc tag %d\n", n); |
| 224 | |
| 225 | out = pack_sg_list(chan->sg, 0, VIRTQUEUE_NUM, tc->sdata, tc->size); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 226 | in = pack_sg_list(chan->sg, out, VIRTQUEUE_NUM-out, rdata, t->msize); |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 227 | |
| 228 | req->status = REQ_STATUS_SENT; |
| 229 | |
| 230 | if (chan->vq->vq_ops->add_buf(chan->vq, chan->sg, out, in, tc)) { |
| 231 | P9_DPRINTK(P9_DEBUG_TRANS, |
| 232 | "9p debug: virtio rpc add_buf returned failure"); |
| 233 | return -EIO; |
| 234 | } |
| 235 | |
| 236 | chan->vq->vq_ops->kick(chan->vq); |
| 237 | |
| 238 | wait_event(*req->wq, req->status == REQ_STATUS_RCVD); |
| 239 | |
| 240 | size = le32_to_cpu(*(__le32 *) rdata); |
| 241 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 242 | err = p9_deserialize_fcall(rdata, size, *rc, t->extended); |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 243 | if (err < 0) { |
| 244 | P9_DPRINTK(P9_DEBUG_TRANS, |
| 245 | "9p debug: virtio rpc deserialize returned %d\n", err); |
| 246 | return err; |
| 247 | } |
| 248 | |
| 249 | #ifdef CONFIG_NET_9P_DEBUG |
| 250 | if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) { |
| 251 | char buf[150]; |
| 252 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 253 | p9_printfcall(buf, sizeof(buf), *rc, t->extended); |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 254 | printk(KERN_NOTICE ">>> %p %s\n", t, buf); |
| 255 | } |
| 256 | #endif |
| 257 | |
| 258 | if (n != P9_NOTAG && p9_idpool_check(n, chan->tagpool)) |
| 259 | p9_idpool_put(n, chan->tagpool); |
| 260 | |
| 261 | req->status = REQ_STATUS_IDLE; |
| 262 | |
| 263 | return 0; |
| 264 | } |
| 265 | |
| 266 | static int p9_virtio_probe(struct virtio_device *vdev) |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 267 | { |
| 268 | int err; |
| 269 | struct virtio_chan *chan; |
| 270 | int index; |
| 271 | |
| 272 | down(&virtio_9p_lock); |
| 273 | index = chan_index++; |
| 274 | chan = &channels[index]; |
| 275 | up(&virtio_9p_lock); |
| 276 | |
| 277 | if (chan_index > MAX_9P_CHAN) { |
| 278 | printk(KERN_ERR "9p: virtio: Maximum channels exceeded\n"); |
| 279 | BUG(); |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 280 | err = -ENOMEM; |
| 281 | goto fail; |
| 282 | } |
| 283 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 284 | chan->vdev = vdev; |
| 285 | |
| 286 | /* We expect one virtqueue, for requests. */ |
| 287 | chan->vq = vdev->config->find_vq(vdev, 0, req_done); |
| 288 | if (IS_ERR(chan->vq)) { |
| 289 | err = PTR_ERR(chan->vq); |
| 290 | goto out_free_vq; |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 291 | } |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 292 | chan->vq->vdev->priv = chan; |
| 293 | spin_lock_init(&chan->lock); |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 294 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 295 | sg_init_table(chan->sg, VIRTQUEUE_NUM); |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 296 | |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 297 | chan->inuse = false; |
| 298 | chan->initialized = true; |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 299 | return 0; |
| 300 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 301 | out_free_vq: |
| 302 | vdev->config->del_vq(chan->vq); |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 303 | fail: |
| 304 | down(&virtio_9p_lock); |
| 305 | chan_index--; |
| 306 | up(&virtio_9p_lock); |
| 307 | return err; |
| 308 | } |
| 309 | |
| 310 | /* This sets up a transport channel for 9p communication. Right now |
| 311 | * we only match the first available channel, but eventually we couldlook up |
| 312 | * alternate channels by matching devname versus a virtio_config entry. |
| 313 | * We use a simple reference count mechanism to ensure that only a single |
| 314 | * mount has a channel open at a time. */ |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 315 | static struct p9_trans * |
| 316 | p9_virtio_create(const char *devname, char *args, int msize, |
| 317 | unsigned char extended) |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 318 | { |
| 319 | struct p9_trans *trans; |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 320 | struct virtio_chan *chan = channels; |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 321 | int index = 0; |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 322 | |
| 323 | down(&virtio_9p_lock); |
| 324 | while (index < MAX_9P_CHAN) { |
| 325 | if (chan->initialized && !chan->inuse) { |
| 326 | chan->inuse = true; |
| 327 | break; |
| 328 | } else { |
| 329 | index++; |
| 330 | chan = &channels[index]; |
| 331 | } |
| 332 | } |
| 333 | up(&virtio_9p_lock); |
| 334 | |
| 335 | if (index >= MAX_9P_CHAN) { |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 336 | printk(KERN_ERR "9p: no channels available\n"); |
| 337 | return ERR_PTR(-ENODEV); |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 338 | } |
| 339 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 340 | chan->tagpool = p9_idpool_create(); |
| 341 | if (IS_ERR(chan->tagpool)) { |
| 342 | printk(KERN_ERR "9p: couldn't allocate tagpool\n"); |
| 343 | return ERR_PTR(-ENOMEM); |
| 344 | } |
| 345 | p9_idpool_get(chan->tagpool); /* reserve tag 0 */ |
| 346 | chan->max_tag = 0; |
| 347 | chan->reqs = NULL; |
| 348 | |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 349 | trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL); |
| 350 | if (!trans) { |
| 351 | printk(KERN_ERR "9p: couldn't allocate transport\n"); |
| 352 | return ERR_PTR(-ENOMEM); |
| 353 | } |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 354 | trans->extended = extended; |
| 355 | trans->msize = msize; |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 356 | trans->close = p9_virtio_close; |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 357 | trans->rpc = p9_virtio_rpc; |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 358 | trans->priv = chan; |
| 359 | |
| 360 | return trans; |
| 361 | } |
| 362 | |
Eric Van Hensbergen | f393354 | 2008-02-06 19:25:04 -0600 | [diff] [blame] | 363 | static void p9_virtio_remove(struct virtio_device *vdev) |
| 364 | { |
| 365 | struct virtio_chan *chan = vdev->priv; |
| 366 | |
| 367 | BUG_ON(chan->inuse); |
| 368 | |
| 369 | if (chan->initialized) { |
| 370 | vdev->config->del_vq(chan->vq); |
| 371 | chan->initialized = false; |
| 372 | } |
| 373 | } |
| 374 | |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 375 | #define VIRTIO_ID_9P 9 |
| 376 | |
| 377 | static struct virtio_device_id id_table[] = { |
| 378 | { VIRTIO_ID_9P, VIRTIO_DEV_ANY_ID }, |
| 379 | { 0 }, |
| 380 | }; |
| 381 | |
| 382 | /* The standard "struct lguest_driver": */ |
| 383 | static struct virtio_driver p9_virtio_drv = { |
| 384 | .driver.name = KBUILD_MODNAME, |
| 385 | .driver.owner = THIS_MODULE, |
| 386 | .id_table = id_table, |
| 387 | .probe = p9_virtio_probe, |
Eric Van Hensbergen | f393354 | 2008-02-06 19:25:04 -0600 | [diff] [blame] | 388 | .remove = p9_virtio_remove, |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 389 | }; |
| 390 | |
| 391 | static struct p9_trans_module p9_virtio_trans = { |
| 392 | .name = "virtio", |
| 393 | .create = p9_virtio_create, |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 394 | .maxsize = PAGE_SIZE*16, |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 395 | .def = 0, |
| 396 | }; |
| 397 | |
| 398 | /* The standard init function */ |
| 399 | static int __init p9_virtio_init(void) |
| 400 | { |
| 401 | int count; |
| 402 | |
| 403 | for (count = 0; count < MAX_9P_CHAN; count++) |
| 404 | channels[count].initialized = false; |
| 405 | |
| 406 | v9fs_register_trans(&p9_virtio_trans); |
| 407 | return register_virtio_driver(&p9_virtio_drv); |
| 408 | } |
| 409 | |
Eric Van Hensbergen | f393354 | 2008-02-06 19:25:04 -0600 | [diff] [blame] | 410 | static void __exit p9_virtio_cleanup(void) |
| 411 | { |
| 412 | unregister_virtio_driver(&p9_virtio_drv); |
| 413 | } |
| 414 | |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 415 | module_init(p9_virtio_init); |
Eric Van Hensbergen | f393354 | 2008-02-06 19:25:04 -0600 | [diff] [blame] | 416 | module_exit(p9_virtio_cleanup); |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 417 | |
| 418 | MODULE_DEVICE_TABLE(virtio, id_table); |
| 419 | MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>"); |
| 420 | MODULE_DESCRIPTION("Virtio 9p Transport"); |
| 421 | MODULE_LICENSE("GPL"); |