Commit | Line | Data |
---|---|---|
bd238fb4 LI |
1 | /* |
2 | * linux/fs/9p/trans_fd.c | |
3 | * | |
4 | * Fd transport layer. Includes deprecated socket layer. | |
5 | * | |
6 | * Copyright (C) 2006 by Russ Cox <rsc@swtch.com> | |
7 | * Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net> | |
8a0dc95f | 8 | * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com> |
bd238fb4 LI |
9 | * Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com> |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 | |
13 | * as published by the Free Software Foundation. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to: | |
22 | * Free Software Foundation | |
23 | * 51 Franklin Street, Fifth Floor | |
24 | * Boston, MA 02111-1301 USA | |
25 | * | |
26 | */ | |
27 | ||
5d385153 JP |
28 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
29 | ||
bd238fb4 LI |
30 | #include <linux/in.h> |
31 | #include <linux/module.h> | |
32 | #include <linux/net.h> | |
33 | #include <linux/ipv6.h> | |
8a0dc95f | 34 | #include <linux/kthread.h> |
bd238fb4 LI |
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> | |
a80d923e | 42 | #include <linux/parser.h> |
5a0e3ad6 | 43 | #include <linux/slab.h> |
bd238fb4 | 44 | #include <net/9p/9p.h> |
8b81ef58 | 45 | #include <net/9p/client.h> |
bd238fb4 LI |
46 | #include <net/9p/transport.h> |
47 | ||
6b18662e AV |
48 | #include <linux/syscalls.h> /* killme */ |
49 | ||
bd238fb4 | 50 | #define P9_PORT 564 |
a80d923e | 51 | #define MAX_SOCK_BUF (64*1024) |
8a0dc95f | 52 | #define MAXPOLLWADDR 2 |
a80d923e | 53 | |
ee443996 EVH |
54 | /** |
55 | * struct p9_fd_opts - per-transport options | |
56 | * @rfd: file descriptor for reading (trans=fd) | |
57 | * @wfd: file descriptor for writing (trans=fd) | |
58 | * @port: port to connect to (trans=tcp) | |
59 | * | |
60 | */ | |
61 | ||
a80d923e EVH |
62 | struct p9_fd_opts { |
63 | int rfd; | |
64 | int wfd; | |
65 | u16 port; | |
66 | }; | |
bd238fb4 | 67 | |
ee443996 EVH |
68 | /** |
69 | * struct p9_trans_fd - transport state | |
70 | * @rd: reference to file to read from | |
71 | * @wr: reference of file to write to | |
72 | * @conn: connection state reference | |
73 | * | |
74 | */ | |
75 | ||
bd238fb4 LI |
76 | struct p9_trans_fd { |
77 | struct file *rd; | |
78 | struct file *wr; | |
8a0dc95f | 79 | struct p9_conn *conn; |
bd238fb4 LI |
80 | }; |
81 | ||
a80d923e EVH |
82 | /* |
83 | * Option Parsing (code inspired by NFS code) | |
84 | * - a little lazy - parse all fd-transport options | |
85 | */ | |
bd238fb4 | 86 | |
a80d923e EVH |
87 | enum { |
88 | /* Options that take integer arguments */ | |
55762690 | 89 | Opt_port, Opt_rfdno, Opt_wfdno, Opt_err, |
a80d923e | 90 | }; |
bd238fb4 | 91 | |
a447c093 | 92 | static const match_table_t tokens = { |
a80d923e EVH |
93 | {Opt_port, "port=%u"}, |
94 | {Opt_rfdno, "rfdno=%u"}, | |
95 | {Opt_wfdno, "wfdno=%u"}, | |
55762690 | 96 | {Opt_err, NULL}, |
a80d923e | 97 | }; |
bd238fb4 | 98 | |
8a0dc95f EVH |
99 | enum { |
100 | Rworksched = 1, /* read work scheduled or running */ | |
101 | Rpending = 2, /* can read */ | |
102 | Wworksched = 4, /* write work scheduled or running */ | |
103 | Wpending = 8, /* can write */ | |
104 | }; | |
105 | ||
992b3f1d TH |
106 | struct p9_poll_wait { |
107 | struct p9_conn *conn; | |
108 | wait_queue_t wait; | |
109 | wait_queue_head_t *wait_addr; | |
ee443996 EVH |
110 | }; |
111 | ||
112 | /** | |
113 | * struct p9_conn - fd mux connection state information | |
ee443996 | 114 | * @mux_list: list link for mux to manage multiple connections (?) |
8b81ef58 | 115 | * @client: reference to client instance for this connection |
ee443996 | 116 | * @err: error state |
ee443996 EVH |
117 | * @req_list: accounting for requests which have been sent |
118 | * @unsent_req_list: accounting for requests that haven't been sent | |
1b0a763b EVH |
119 | * @req: current request being processed (if any) |
120 | * @tmp_buf: temporary buffer to read in header | |
121 | * @rsize: amount to read for current frame | |
ee443996 EVH |
122 | * @rpos: read position in current frame |
123 | * @rbuf: current read buffer | |
124 | * @wpos: write position for current frame | |
125 | * @wsize: amount of data to write for current frame | |
126 | * @wbuf: current write buffer | |
0e15597e | 127 | * @poll_pending_link: pending links to be polled per conn |
ee443996 | 128 | * @poll_wait: array of wait_q's for various worker threads |
ee443996 EVH |
129 | * @pt: poll state |
130 | * @rq: current read work | |
131 | * @wq: current write work | |
132 | * @wsched: ???? | |
133 | * | |
134 | */ | |
8a0dc95f EVH |
135 | |
136 | struct p9_conn { | |
8a0dc95f | 137 | struct list_head mux_list; |
8b81ef58 | 138 | struct p9_client *client; |
8a0dc95f | 139 | int err; |
8a0dc95f EVH |
140 | struct list_head req_list; |
141 | struct list_head unsent_req_list; | |
1b0a763b EVH |
142 | struct p9_req_t *req; |
143 | char tmp_buf[7]; | |
144 | int rsize; | |
8a0dc95f EVH |
145 | int rpos; |
146 | char *rbuf; | |
147 | int wpos; | |
148 | int wsize; | |
149 | char *wbuf; | |
992b3f1d TH |
150 | struct list_head poll_pending_link; |
151 | struct p9_poll_wait poll_wait[MAXPOLLWADDR]; | |
8a0dc95f EVH |
152 | poll_table pt; |
153 | struct work_struct rq; | |
154 | struct work_struct wq; | |
155 | unsigned long wsched; | |
156 | }; | |
157 | ||
aa70c585 TH |
158 | static void p9_poll_workfn(struct work_struct *work); |
159 | ||
992b3f1d TH |
160 | static DEFINE_SPINLOCK(p9_poll_lock); |
161 | static LIST_HEAD(p9_poll_pending_list); | |
aa70c585 | 162 | static DECLARE_WORK(p9_poll_work, p9_poll_workfn); |
8a0dc95f | 163 | |
992b3f1d | 164 | static void p9_mux_poll_stop(struct p9_conn *m) |
8a0dc95f | 165 | { |
992b3f1d TH |
166 | unsigned long flags; |
167 | int i; | |
8a0dc95f | 168 | |
992b3f1d TH |
169 | for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { |
170 | struct p9_poll_wait *pwait = &m->poll_wait[i]; | |
8a0dc95f | 171 | |
992b3f1d TH |
172 | if (pwait->wait_addr) { |
173 | remove_wait_queue(pwait->wait_addr, &pwait->wait); | |
174 | pwait->wait_addr = NULL; | |
8a0dc95f | 175 | } |
8a0dc95f EVH |
176 | } |
177 | ||
992b3f1d TH |
178 | spin_lock_irqsave(&p9_poll_lock, flags); |
179 | list_del_init(&m->poll_pending_link); | |
180 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
8a0dc95f EVH |
181 | } |
182 | ||
183 | /** | |
5503ac56 EVH |
184 | * p9_conn_cancel - cancel all pending requests with error |
185 | * @m: mux data | |
186 | * @err: error code | |
8a0dc95f | 187 | * |
8a0dc95f | 188 | */ |
ee443996 | 189 | |
51a87c55 | 190 | static void p9_conn_cancel(struct p9_conn *m, int err) |
8a0dc95f | 191 | { |
673d62cd | 192 | struct p9_req_t *req, *rtmp; |
91b8534f | 193 | unsigned long flags; |
5503ac56 | 194 | LIST_HEAD(cancel_list); |
8a0dc95f | 195 | |
5d385153 | 196 | p9_debug(P9_DEBUG_ERROR, "mux %p err %d\n", m, err); |
7eb923b8 | 197 | |
91b8534f | 198 | spin_lock_irqsave(&m->client->lock, flags); |
7eb923b8 EVH |
199 | |
200 | if (m->err) { | |
201 | spin_unlock_irqrestore(&m->client->lock, flags); | |
202 | return; | |
203 | } | |
204 | ||
205 | m->err = err; | |
206 | ||
5503ac56 | 207 | list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) { |
673d62cd EVH |
208 | req->status = REQ_STATUS_ERROR; |
209 | if (!req->t_err) | |
210 | req->t_err = err; | |
5503ac56 EVH |
211 | list_move(&req->req_list, &cancel_list); |
212 | } | |
213 | list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) { | |
673d62cd EVH |
214 | req->status = REQ_STATUS_ERROR; |
215 | if (!req->t_err) | |
216 | req->t_err = err; | |
5503ac56 | 217 | list_move(&req->req_list, &cancel_list); |
8a0dc95f | 218 | } |
91b8534f | 219 | spin_unlock_irqrestore(&m->client->lock, flags); |
8a0dc95f | 220 | |
5503ac56 | 221 | list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) { |
5d385153 | 222 | p9_debug(P9_DEBUG_ERROR, "call back req %p\n", req); |
1bab88b2 | 223 | list_del(&req->req_list); |
91b8534f | 224 | p9_client_cb(m->client, req); |
8a0dc95f | 225 | } |
8a0dc95f EVH |
226 | } |
227 | ||
29af9309 | 228 | static int |
5503ac56 | 229 | p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt) |
8a0dc95f | 230 | { |
5503ac56 EVH |
231 | int ret, n; |
232 | struct p9_trans_fd *ts = NULL; | |
8a0dc95f | 233 | |
5503ac56 EVH |
234 | if (client && client->status == Connected) |
235 | ts = client->trans; | |
7dc5d24b | 236 | |
5503ac56 EVH |
237 | if (!ts) |
238 | return -EREMOTEIO; | |
7dc5d24b | 239 | |
5503ac56 EVH |
240 | if (!ts->rd->f_op || !ts->rd->f_op->poll) |
241 | return -EIO; | |
8a0dc95f | 242 | |
5503ac56 EVH |
243 | if (!ts->wr->f_op || !ts->wr->f_op->poll) |
244 | return -EIO; | |
992b3f1d | 245 | |
5503ac56 EVH |
246 | ret = ts->rd->f_op->poll(ts->rd, pt); |
247 | if (ret < 0) | |
248 | return ret; | |
992b3f1d | 249 | |
5503ac56 EVH |
250 | if (ts->rd != ts->wr) { |
251 | n = ts->wr->f_op->poll(ts->wr, pt); | |
252 | if (n < 0) | |
253 | return n; | |
254 | ret = (ret & ~POLLOUT) | (n & ~POLLIN); | |
255 | } | |
256 | ||
257 | return ret; | |
992b3f1d TH |
258 | } |
259 | ||
8a0dc95f | 260 | /** |
5503ac56 EVH |
261 | * p9_fd_read- read from a fd |
262 | * @client: client instance | |
263 | * @v: buffer to receive data into | |
264 | * @len: size of receive buffer | |
ee443996 | 265 | * |
8a0dc95f | 266 | */ |
ee443996 | 267 | |
5503ac56 | 268 | static int p9_fd_read(struct p9_client *client, void *v, int len) |
8a0dc95f | 269 | { |
5503ac56 EVH |
270 | int ret; |
271 | struct p9_trans_fd *ts = NULL; | |
8a0dc95f | 272 | |
5503ac56 EVH |
273 | if (client && client->status != Disconnected) |
274 | ts = client->trans; | |
8a0dc95f | 275 | |
5503ac56 EVH |
276 | if (!ts) |
277 | return -EREMOTEIO; | |
8a0dc95f | 278 | |
5503ac56 | 279 | if (!(ts->rd->f_flags & O_NONBLOCK)) |
5d385153 | 280 | p9_debug(P9_DEBUG_ERROR, "blocking read ...\n"); |
8a0dc95f | 281 | |
5503ac56 EVH |
282 | ret = kernel_read(ts->rd, ts->rd->f_pos, v, len); |
283 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) | |
284 | client->status = Disconnected; | |
285 | return ret; | |
8a0dc95f EVH |
286 | } |
287 | ||
288 | /** | |
5503ac56 EVH |
289 | * p9_read_work - called when there is some data to be read from a transport |
290 | * @work: container of work to be done | |
ee443996 | 291 | * |
8a0dc95f | 292 | */ |
ee443996 | 293 | |
5503ac56 | 294 | static void p9_read_work(struct work_struct *work) |
8a0dc95f | 295 | { |
5503ac56 EVH |
296 | int n, err; |
297 | struct p9_conn *m; | |
5503ac56 EVH |
298 | |
299 | m = container_of(work, struct p9_conn, rq); | |
8a0dc95f EVH |
300 | |
301 | if (m->err < 0) | |
302 | return; | |
303 | ||
5d385153 | 304 | p9_debug(P9_DEBUG_TRANS, "start mux %p pos %d\n", m, m->rpos); |
8a0dc95f | 305 | |
1b0a763b EVH |
306 | if (!m->rbuf) { |
307 | m->rbuf = m->tmp_buf; | |
5503ac56 | 308 | m->rpos = 0; |
1b0a763b | 309 | m->rsize = 7; /* start by reading header */ |
8a0dc95f EVH |
310 | } |
311 | ||
5503ac56 | 312 | clear_bit(Rpending, &m->wsched); |
5d385153 JP |
313 | p9_debug(P9_DEBUG_TRANS, "read mux %p pos %d size: %d = %d\n", |
314 | m, m->rpos, m->rsize, m->rsize-m->rpos); | |
5503ac56 | 315 | err = p9_fd_read(m->client, m->rbuf + m->rpos, |
1b0a763b | 316 | m->rsize - m->rpos); |
5d385153 | 317 | p9_debug(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err); |
5503ac56 | 318 | if (err == -EAGAIN) { |
0462194d | 319 | goto end_clear; |
8a0dc95f | 320 | } |
8a0dc95f | 321 | |
5503ac56 EVH |
322 | if (err <= 0) |
323 | goto error; | |
324 | ||
325 | m->rpos += err; | |
1b0a763b EVH |
326 | |
327 | if ((!m->req) && (m->rpos == m->rsize)) { /* header read in */ | |
328 | u16 tag; | |
5d385153 | 329 | p9_debug(P9_DEBUG_TRANS, "got new header\n"); |
1b0a763b EVH |
330 | |
331 | n = le32_to_cpu(*(__le32 *) m->rbuf); /* read packet size */ | |
5503ac56 | 332 | if (n >= m->client->msize) { |
5d385153 JP |
333 | p9_debug(P9_DEBUG_ERROR, |
334 | "requested packet size too big: %d\n", n); | |
5503ac56 EVH |
335 | err = -EIO; |
336 | goto error; | |
337 | } | |
338 | ||
1b0a763b | 339 | tag = le16_to_cpu(*(__le16 *) (m->rbuf+5)); /* read tag */ |
5d385153 JP |
340 | p9_debug(P9_DEBUG_TRANS, |
341 | "mux %p pkt: size: %d bytes tag: %d\n", m, n, tag); | |
1b0a763b EVH |
342 | |
343 | m->req = p9_tag_lookup(m->client, tag); | |
1bab88b2 LI |
344 | if (!m->req || (m->req->status != REQ_STATUS_SENT && |
345 | m->req->status != REQ_STATUS_FLSH)) { | |
5d385153 JP |
346 | p9_debug(P9_DEBUG_ERROR, "Unexpected packet tag %d\n", |
347 | tag); | |
1b0a763b EVH |
348 | err = -EIO; |
349 | goto error; | |
350 | } | |
351 | ||
352 | if (m->req->rc == NULL) { | |
353 | m->req->rc = kmalloc(sizeof(struct p9_fcall) + | |
eeff66ef | 354 | m->client->msize, GFP_NOFS); |
1b0a763b EVH |
355 | if (!m->req->rc) { |
356 | m->req = NULL; | |
357 | err = -ENOMEM; | |
358 | goto error; | |
359 | } | |
360 | } | |
361 | m->rbuf = (char *)m->req->rc + sizeof(struct p9_fcall); | |
362 | memcpy(m->rbuf, m->tmp_buf, m->rsize); | |
363 | m->rsize = n; | |
364 | } | |
5503ac56 | 365 | |
1b0a763b EVH |
366 | /* not an else because some packets (like clunk) have no payload */ |
367 | if ((m->req) && (m->rpos == m->rsize)) { /* packet is read in */ | |
5d385153 | 368 | p9_debug(P9_DEBUG_TRANS, "got new packet\n"); |
7eb923b8 | 369 | spin_lock(&m->client->lock); |
1bab88b2 LI |
370 | if (m->req->status != REQ_STATUS_ERROR) |
371 | m->req->status = REQ_STATUS_RCVD; | |
91b8534f | 372 | list_del(&m->req->req_list); |
7eb923b8 | 373 | spin_unlock(&m->client->lock); |
91b8534f | 374 | p9_client_cb(m->client, m->req); |
1b0a763b EVH |
375 | m->rbuf = NULL; |
376 | m->rpos = 0; | |
377 | m->rsize = 0; | |
1b0a763b | 378 | m->req = NULL; |
5503ac56 EVH |
379 | } |
380 | ||
0462194d SD |
381 | end_clear: |
382 | clear_bit(Rworksched, &m->wsched); | |
383 | ||
5503ac56 EVH |
384 | if (!list_empty(&m->req_list)) { |
385 | if (test_and_clear_bit(Rpending, &m->wsched)) | |
386 | n = POLLIN; | |
387 | else | |
388 | n = p9_fd_poll(m->client, NULL); | |
389 | ||
0462194d | 390 | if ((n & POLLIN) && !test_and_set_bit(Rworksched, &m->wsched)) { |
5d385153 | 391 | p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m); |
61edeeed | 392 | schedule_work(&m->rq); |
0462194d SD |
393 | } |
394 | } | |
5503ac56 EVH |
395 | |
396 | return; | |
5503ac56 EVH |
397 | error: |
398 | p9_conn_cancel(m, err); | |
399 | clear_bit(Rworksched, &m->wsched); | |
400 | } | |
401 | ||
402 | /** | |
403 | * p9_fd_write - write to a socket | |
404 | * @client: client instance | |
405 | * @v: buffer to send data from | |
406 | * @len: size of send buffer | |
ee443996 | 407 | * |
8a0dc95f | 408 | */ |
ee443996 | 409 | |
5503ac56 | 410 | static int p9_fd_write(struct p9_client *client, void *v, int len) |
8a0dc95f | 411 | { |
5503ac56 EVH |
412 | int ret; |
413 | mm_segment_t oldfs; | |
414 | struct p9_trans_fd *ts = NULL; | |
8a0dc95f | 415 | |
5503ac56 EVH |
416 | if (client && client->status != Disconnected) |
417 | ts = client->trans; | |
8a0dc95f | 418 | |
5503ac56 EVH |
419 | if (!ts) |
420 | return -EREMOTEIO; | |
8a0dc95f | 421 | |
5503ac56 | 422 | if (!(ts->wr->f_flags & O_NONBLOCK)) |
5d385153 | 423 | p9_debug(P9_DEBUG_ERROR, "blocking write ...\n"); |
992b3f1d | 424 | |
5503ac56 EVH |
425 | oldfs = get_fs(); |
426 | set_fs(get_ds()); | |
427 | /* The cast to a user pointer is valid due to the set_fs() */ | |
e3db6cb4 | 428 | ret = vfs_write(ts->wr, (__force void __user *)v, len, &ts->wr->f_pos); |
5503ac56 | 429 | set_fs(oldfs); |
992b3f1d | 430 | |
5503ac56 EVH |
431 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) |
432 | client->status = Disconnected; | |
433 | return ret; | |
8a0dc95f EVH |
434 | } |
435 | ||
436 | /** | |
437 | * p9_write_work - called when a transport can send some data | |
ee443996 EVH |
438 | * @work: container for work to be done |
439 | * | |
8a0dc95f | 440 | */ |
ee443996 | 441 | |
8a0dc95f EVH |
442 | static void p9_write_work(struct work_struct *work) |
443 | { | |
444 | int n, err; | |
445 | struct p9_conn *m; | |
673d62cd | 446 | struct p9_req_t *req; |
8a0dc95f EVH |
447 | |
448 | m = container_of(work, struct p9_conn, wq); | |
449 | ||
450 | if (m->err < 0) { | |
451 | clear_bit(Wworksched, &m->wsched); | |
452 | return; | |
453 | } | |
454 | ||
455 | if (!m->wsize) { | |
456 | if (list_empty(&m->unsent_req_list)) { | |
457 | clear_bit(Wworksched, &m->wsched); | |
458 | return; | |
459 | } | |
460 | ||
673d62cd EVH |
461 | spin_lock(&m->client->lock); |
462 | req = list_entry(m->unsent_req_list.next, struct p9_req_t, | |
8a0dc95f | 463 | req_list); |
673d62cd | 464 | req->status = REQ_STATUS_SENT; |
5d385153 | 465 | p9_debug(P9_DEBUG_TRANS, "move req %p\n", req); |
8a0dc95f | 466 | list_move_tail(&req->req_list, &m->req_list); |
8a0dc95f | 467 | |
673d62cd EVH |
468 | m->wbuf = req->tc->sdata; |
469 | m->wsize = req->tc->size; | |
8a0dc95f | 470 | m->wpos = 0; |
673d62cd | 471 | spin_unlock(&m->client->lock); |
8a0dc95f EVH |
472 | } |
473 | ||
5d385153 JP |
474 | p9_debug(P9_DEBUG_TRANS, "mux %p pos %d size %d\n", |
475 | m, m->wpos, m->wsize); | |
8a0dc95f | 476 | clear_bit(Wpending, &m->wsched); |
8b81ef58 | 477 | err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos); |
5d385153 | 478 | p9_debug(P9_DEBUG_TRANS, "mux %p sent %d bytes\n", m, err); |
584a8c13 SD |
479 | if (err == -EAGAIN) |
480 | goto end_clear; | |
481 | ||
8a0dc95f EVH |
482 | |
483 | if (err < 0) | |
484 | goto error; | |
485 | else if (err == 0) { | |
486 | err = -EREMOTEIO; | |
487 | goto error; | |
488 | } | |
489 | ||
490 | m->wpos += err; | |
491 | if (m->wpos == m->wsize) | |
492 | m->wpos = m->wsize = 0; | |
493 | ||
584a8c13 SD |
494 | end_clear: |
495 | clear_bit(Wworksched, &m->wsched); | |
496 | ||
1957b3a8 | 497 | if (m->wsize || !list_empty(&m->unsent_req_list)) { |
8a0dc95f EVH |
498 | if (test_and_clear_bit(Wpending, &m->wsched)) |
499 | n = POLLOUT; | |
500 | else | |
8b81ef58 | 501 | n = p9_fd_poll(m->client, NULL); |
8a0dc95f | 502 | |
584a8c13 SD |
503 | if ((n & POLLOUT) && |
504 | !test_and_set_bit(Wworksched, &m->wsched)) { | |
5d385153 | 505 | p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m); |
61edeeed | 506 | schedule_work(&m->wq); |
584a8c13 SD |
507 | } |
508 | } | |
8a0dc95f EVH |
509 | |
510 | return; | |
511 | ||
512 | error: | |
513 | p9_conn_cancel(m, err); | |
514 | clear_bit(Wworksched, &m->wsched); | |
515 | } | |
516 | ||
95c96174 | 517 | static int p9_pollwake(wait_queue_t *wait, unsigned int mode, int sync, void *key) |
8a0dc95f | 518 | { |
5503ac56 EVH |
519 | struct p9_poll_wait *pwait = |
520 | container_of(wait, struct p9_poll_wait, wait); | |
521 | struct p9_conn *m = pwait->conn; | |
522 | unsigned long flags; | |
8a0dc95f | 523 | |
5503ac56 EVH |
524 | spin_lock_irqsave(&p9_poll_lock, flags); |
525 | if (list_empty(&m->poll_pending_link)) | |
526 | list_add_tail(&m->poll_pending_link, &p9_poll_pending_list); | |
527 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
8a0dc95f | 528 | |
aa70c585 TH |
529 | schedule_work(&p9_poll_work); |
530 | return 1; | |
8a0dc95f EVH |
531 | } |
532 | ||
533 | /** | |
5503ac56 EVH |
534 | * p9_pollwait - add poll task to the wait queue |
535 | * @filp: file pointer being polled | |
536 | * @wait_address: wait_q to block on | |
537 | * @p: poll state | |
ee443996 | 538 | * |
5503ac56 | 539 | * called by files poll operation to add v9fs-poll task to files wait queue |
8a0dc95f | 540 | */ |
ee443996 | 541 | |
5503ac56 EVH |
542 | static void |
543 | p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p) | |
8a0dc95f | 544 | { |
5503ac56 EVH |
545 | struct p9_conn *m = container_of(p, struct p9_conn, pt); |
546 | struct p9_poll_wait *pwait = NULL; | |
547 | int i; | |
8a0dc95f | 548 | |
5503ac56 EVH |
549 | for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { |
550 | if (m->poll_wait[i].wait_addr == NULL) { | |
551 | pwait = &m->poll_wait[i]; | |
552 | break; | |
8a0dc95f | 553 | } |
8a0dc95f EVH |
554 | } |
555 | ||
5503ac56 | 556 | if (!pwait) { |
5d385153 | 557 | p9_debug(P9_DEBUG_ERROR, "not enough wait_address slots\n"); |
8a0dc95f EVH |
558 | return; |
559 | } | |
560 | ||
5503ac56 EVH |
561 | pwait->conn = m; |
562 | pwait->wait_addr = wait_address; | |
563 | init_waitqueue_func_entry(&pwait->wait, p9_pollwake); | |
564 | add_wait_queue(wait_address, &pwait->wait); | |
565 | } | |
8a0dc95f | 566 | |
5503ac56 EVH |
567 | /** |
568 | * p9_conn_create - allocate and initialize the per-session mux data | |
569 | * @client: client instance | |
570 | * | |
571 | * Note: Creates the polling task if this is the first session. | |
572 | */ | |
8a0dc95f | 573 | |
5503ac56 EVH |
574 | static struct p9_conn *p9_conn_create(struct p9_client *client) |
575 | { | |
95820a36 | 576 | int n; |
5503ac56 | 577 | struct p9_conn *m; |
8a0dc95f | 578 | |
5d385153 | 579 | p9_debug(P9_DEBUG_TRANS, "client %p msize %d\n", client, client->msize); |
5503ac56 EVH |
580 | m = kzalloc(sizeof(struct p9_conn), GFP_KERNEL); |
581 | if (!m) | |
582 | return ERR_PTR(-ENOMEM); | |
8a0dc95f | 583 | |
5503ac56 EVH |
584 | INIT_LIST_HEAD(&m->mux_list); |
585 | m->client = client; | |
8a0dc95f | 586 | |
5503ac56 EVH |
587 | INIT_LIST_HEAD(&m->req_list); |
588 | INIT_LIST_HEAD(&m->unsent_req_list); | |
589 | INIT_WORK(&m->rq, p9_read_work); | |
590 | INIT_WORK(&m->wq, p9_write_work); | |
591 | INIT_LIST_HEAD(&m->poll_pending_link); | |
592 | init_poll_funcptr(&m->pt, p9_pollwait); | |
8a0dc95f | 593 | |
5503ac56 EVH |
594 | n = p9_fd_poll(client, &m->pt); |
595 | if (n & POLLIN) { | |
5d385153 | 596 | p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m); |
5503ac56 EVH |
597 | set_bit(Rpending, &m->wsched); |
598 | } | |
8a0dc95f | 599 | |
5503ac56 | 600 | if (n & POLLOUT) { |
5d385153 | 601 | p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m); |
5503ac56 EVH |
602 | set_bit(Wpending, &m->wsched); |
603 | } | |
604 | ||
5503ac56 EVH |
605 | return m; |
606 | } | |
8a0dc95f | 607 | |
5503ac56 EVH |
608 | /** |
609 | * p9_poll_mux - polls a mux and schedules read or write works if necessary | |
610 | * @m: connection to poll | |
611 | * | |
612 | */ | |
613 | ||
614 | static void p9_poll_mux(struct p9_conn *m) | |
615 | { | |
616 | int n; | |
617 | ||
618 | if (m->err < 0) | |
619 | return; | |
620 | ||
621 | n = p9_fd_poll(m->client, NULL); | |
622 | if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) { | |
5d385153 | 623 | p9_debug(P9_DEBUG_TRANS, "error mux %p err %d\n", m, n); |
5503ac56 EVH |
624 | if (n >= 0) |
625 | n = -ECONNRESET; | |
626 | p9_conn_cancel(m, n); | |
627 | } | |
628 | ||
629 | if (n & POLLIN) { | |
630 | set_bit(Rpending, &m->wsched); | |
5d385153 | 631 | p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m); |
5503ac56 | 632 | if (!test_and_set_bit(Rworksched, &m->wsched)) { |
5d385153 | 633 | p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m); |
61edeeed | 634 | schedule_work(&m->rq); |
5503ac56 EVH |
635 | } |
636 | } | |
8a0dc95f | 637 | |
5503ac56 EVH |
638 | if (n & POLLOUT) { |
639 | set_bit(Wpending, &m->wsched); | |
5d385153 | 640 | p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m); |
f64f9e71 JP |
641 | if ((m->wsize || !list_empty(&m->unsent_req_list)) && |
642 | !test_and_set_bit(Wworksched, &m->wsched)) { | |
5d385153 | 643 | p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m); |
61edeeed | 644 | schedule_work(&m->wq); |
5503ac56 EVH |
645 | } |
646 | } | |
8a0dc95f EVH |
647 | } |
648 | ||
649 | /** | |
91b8534f | 650 | * p9_fd_request - send 9P request |
8a0dc95f EVH |
651 | * The function can sleep until the request is scheduled for sending. |
652 | * The function can be interrupted. Return from the function is not | |
91b8534f | 653 | * a guarantee that the request is sent successfully. |
8a0dc95f | 654 | * |
91b8534f EVH |
655 | * @client: client instance |
656 | * @req: request to be sent | |
ee443996 | 657 | * |
8a0dc95f | 658 | */ |
ee443996 | 659 | |
91b8534f | 660 | static int p9_fd_request(struct p9_client *client, struct p9_req_t *req) |
8a0dc95f EVH |
661 | { |
662 | int n; | |
91b8534f EVH |
663 | struct p9_trans_fd *ts = client->trans; |
664 | struct p9_conn *m = ts->conn; | |
8a0dc95f | 665 | |
5d385153 JP |
666 | p9_debug(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n", |
667 | m, current, req->tc, req->tc->id); | |
8a0dc95f | 668 | if (m->err < 0) |
91b8534f | 669 | return m->err; |
8a0dc95f | 670 | |
91b8534f | 671 | spin_lock(&client->lock); |
7eb923b8 | 672 | req->status = REQ_STATUS_UNSENT; |
8a0dc95f | 673 | list_add_tail(&req->req_list, &m->unsent_req_list); |
91b8534f | 674 | spin_unlock(&client->lock); |
8a0dc95f EVH |
675 | |
676 | if (test_and_clear_bit(Wpending, &m->wsched)) | |
677 | n = POLLOUT; | |
678 | else | |
8b81ef58 | 679 | n = p9_fd_poll(m->client, NULL); |
8a0dc95f EVH |
680 | |
681 | if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched)) | |
61edeeed | 682 | schedule_work(&m->wq); |
8a0dc95f | 683 | |
91b8534f | 684 | return 0; |
8a0dc95f EVH |
685 | } |
686 | ||
91b8534f | 687 | static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req) |
8a0dc95f | 688 | { |
7eb923b8 | 689 | int ret = 1; |
8a0dc95f | 690 | |
5d385153 | 691 | p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req); |
8a0dc95f | 692 | |
91b8534f | 693 | spin_lock(&client->lock); |
91b8534f | 694 | |
91b8534f | 695 | if (req->status == REQ_STATUS_UNSENT) { |
1bab88b2 | 696 | list_del(&req->req_list); |
91b8534f | 697 | req->status = REQ_STATUS_FLSHD; |
7eb923b8 | 698 | ret = 0; |
1bab88b2 LI |
699 | } else if (req->status == REQ_STATUS_SENT) |
700 | req->status = REQ_STATUS_FLSH; | |
8a0dc95f | 701 | |
7eb923b8 EVH |
702 | spin_unlock(&client->lock); |
703 | ||
704 | return ret; | |
8a0dc95f EVH |
705 | } |
706 | ||
a80d923e | 707 | /** |
0e15597e AK |
708 | * parse_opts - parse mount options into p9_fd_opts structure |
709 | * @params: options string passed from mount | |
710 | * @opts: fd transport-specific structure to parse options into | |
a80d923e | 711 | * |
bb8ffdfc | 712 | * Returns 0 upon success, -ERRNO upon failure |
a80d923e | 713 | */ |
bd238fb4 | 714 | |
bb8ffdfc | 715 | static int parse_opts(char *params, struct p9_fd_opts *opts) |
bd238fb4 | 716 | { |
a80d923e EVH |
717 | char *p; |
718 | substring_t args[MAX_OPT_ARGS]; | |
719 | int option; | |
d8c8a9e3 | 720 | char *options, *tmp_options; |
bd238fb4 | 721 | |
a80d923e EVH |
722 | opts->port = P9_PORT; |
723 | opts->rfd = ~0; | |
724 | opts->wfd = ~0; | |
bd238fb4 | 725 | |
bb8ffdfc EVH |
726 | if (!params) |
727 | return 0; | |
728 | ||
d8c8a9e3 EVH |
729 | tmp_options = kstrdup(params, GFP_KERNEL); |
730 | if (!tmp_options) { | |
5d385153 JP |
731 | p9_debug(P9_DEBUG_ERROR, |
732 | "failed to allocate copy of option string\n"); | |
bb8ffdfc EVH |
733 | return -ENOMEM; |
734 | } | |
d8c8a9e3 | 735 | options = tmp_options; |
bd238fb4 | 736 | |
a80d923e EVH |
737 | while ((p = strsep(&options, ",")) != NULL) { |
738 | int token; | |
bb8ffdfc | 739 | int r; |
a80d923e EVH |
740 | if (!*p) |
741 | continue; | |
742 | token = match_token(p, tokens, args); | |
15da4b16 AK |
743 | if (token != Opt_err) { |
744 | r = match_int(&args[0], &option); | |
745 | if (r < 0) { | |
5d385153 JP |
746 | p9_debug(P9_DEBUG_ERROR, |
747 | "integer field, but no integer?\n"); | |
15da4b16 AK |
748 | continue; |
749 | } | |
a80d923e EVH |
750 | } |
751 | switch (token) { | |
752 | case Opt_port: | |
753 | opts->port = option; | |
754 | break; | |
755 | case Opt_rfdno: | |
756 | opts->rfd = option; | |
757 | break; | |
758 | case Opt_wfdno: | |
759 | opts->wfd = option; | |
760 | break; | |
761 | default: | |
762 | continue; | |
763 | } | |
bd238fb4 | 764 | } |
d8c8a9e3 EVH |
765 | |
766 | kfree(tmp_options); | |
bb8ffdfc | 767 | return 0; |
bd238fb4 | 768 | } |
bd238fb4 | 769 | |
8b81ef58 | 770 | static int p9_fd_open(struct p9_client *client, int rfd, int wfd) |
bd238fb4 | 771 | { |
a80d923e EVH |
772 | struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd), |
773 | GFP_KERNEL); | |
774 | if (!ts) | |
775 | return -ENOMEM; | |
bd238fb4 | 776 | |
a80d923e EVH |
777 | ts->rd = fget(rfd); |
778 | ts->wr = fget(wfd); | |
779 | if (!ts->rd || !ts->wr) { | |
780 | if (ts->rd) | |
781 | fput(ts->rd); | |
782 | if (ts->wr) | |
783 | fput(ts->wr); | |
784 | kfree(ts); | |
785 | return -EIO; | |
bd238fb4 LI |
786 | } |
787 | ||
8b81ef58 EVH |
788 | client->trans = ts; |
789 | client->status = Connected; | |
bd238fb4 | 790 | |
a80d923e | 791 | return 0; |
bd238fb4 | 792 | } |
bd238fb4 | 793 | |
8b81ef58 | 794 | static int p9_socket_open(struct p9_client *client, struct socket *csocket) |
bd238fb4 | 795 | { |
6b18662e AV |
796 | struct p9_trans_fd *p; |
797 | int ret, fd; | |
798 | ||
799 | p = kmalloc(sizeof(struct p9_trans_fd), GFP_KERNEL); | |
800 | if (!p) | |
801 | return -ENOMEM; | |
bd238fb4 LI |
802 | |
803 | csocket->sk->sk_allocation = GFP_NOIO; | |
a677a039 | 804 | fd = sock_map_fd(csocket, 0); |
bd238fb4 | 805 | if (fd < 0) { |
5d385153 JP |
806 | pr_err("%s (%d): failed to map fd\n", |
807 | __func__, task_pid_nr(current)); | |
6b18662e AV |
808 | sock_release(csocket); |
809 | kfree(p); | |
bd238fb4 LI |
810 | return fd; |
811 | } | |
812 | ||
6b18662e AV |
813 | get_file(csocket->file); |
814 | get_file(csocket->file); | |
815 | p->wr = p->rd = csocket->file; | |
816 | client->trans = p; | |
817 | client->status = Connected; | |
818 | ||
819 | sys_close(fd); /* still racy */ | |
820 | ||
821 | p->rd->f_flags |= O_NONBLOCK; | |
822 | ||
823 | p->conn = p9_conn_create(client); | |
824 | if (IS_ERR(p->conn)) { | |
825 | ret = PTR_ERR(p->conn); | |
826 | p->conn = NULL; | |
827 | kfree(p); | |
828 | sockfd_put(csocket); | |
bd238fb4 LI |
829 | sockfd_put(csocket); |
830 | return ret; | |
831 | } | |
bd238fb4 LI |
832 | return 0; |
833 | } | |
834 | ||
bd238fb4 | 835 | /** |
5503ac56 EVH |
836 | * p9_mux_destroy - cancels all pending requests and frees mux resources |
837 | * @m: mux to destroy | |
bd238fb4 LI |
838 | * |
839 | */ | |
ee443996 | 840 | |
5503ac56 | 841 | static void p9_conn_destroy(struct p9_conn *m) |
bd238fb4 | 842 | { |
5d385153 JP |
843 | p9_debug(P9_DEBUG_TRANS, "mux %p prev %p next %p\n", |
844 | m, m->mux_list.prev, m->mux_list.next); | |
bd238fb4 | 845 | |
5503ac56 EVH |
846 | p9_mux_poll_stop(m); |
847 | cancel_work_sync(&m->rq); | |
848 | cancel_work_sync(&m->wq); | |
bd238fb4 | 849 | |
5503ac56 | 850 | p9_conn_cancel(m, -ECONNRESET); |
bd238fb4 | 851 | |
5503ac56 | 852 | m->client = NULL; |
5503ac56 | 853 | kfree(m); |
bd238fb4 LI |
854 | } |
855 | ||
856 | /** | |
8b81ef58 EVH |
857 | * p9_fd_close - shutdown file descriptor transport |
858 | * @client: client instance | |
bd238fb4 LI |
859 | * |
860 | */ | |
ee443996 | 861 | |
8b81ef58 | 862 | static void p9_fd_close(struct p9_client *client) |
bd238fb4 LI |
863 | { |
864 | struct p9_trans_fd *ts; | |
865 | ||
8b81ef58 | 866 | if (!client) |
bd238fb4 LI |
867 | return; |
868 | ||
8b81ef58 | 869 | ts = client->trans; |
bd238fb4 LI |
870 | if (!ts) |
871 | return; | |
872 | ||
8b81ef58 EVH |
873 | client->status = Disconnected; |
874 | ||
8a0dc95f EVH |
875 | p9_conn_destroy(ts->conn); |
876 | ||
bd238fb4 LI |
877 | if (ts->rd) |
878 | fput(ts->rd); | |
879 | if (ts->wr) | |
880 | fput(ts->wr); | |
8b81ef58 | 881 | |
bd238fb4 LI |
882 | kfree(ts); |
883 | } | |
884 | ||
887b3ece EVH |
885 | /* |
886 | * stolen from NFS - maybe should be made a generic function? | |
887 | */ | |
888 | static inline int valid_ipaddr4(const char *buf) | |
889 | { | |
890 | int rc, count, in[4]; | |
891 | ||
892 | rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]); | |
893 | if (rc != 4) | |
894 | return -EINVAL; | |
895 | for (count = 0; count < 4; count++) { | |
896 | if (in[count] > 255) | |
897 | return -EINVAL; | |
898 | } | |
899 | return 0; | |
900 | } | |
901 | ||
8b81ef58 EVH |
902 | static int |
903 | p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args) | |
a80d923e EVH |
904 | { |
905 | int err; | |
a80d923e EVH |
906 | struct socket *csocket; |
907 | struct sockaddr_in sin_server; | |
908 | struct p9_fd_opts opts; | |
909 | ||
bb8ffdfc EVH |
910 | err = parse_opts(args, &opts); |
911 | if (err < 0) | |
8b81ef58 | 912 | return err; |
a80d923e | 913 | |
887b3ece | 914 | if (valid_ipaddr4(addr) < 0) |
8b81ef58 | 915 | return -EINVAL; |
887b3ece | 916 | |
a80d923e | 917 | csocket = NULL; |
a80d923e EVH |
918 | |
919 | sin_server.sin_family = AF_INET; | |
920 | sin_server.sin_addr.s_addr = in_aton(addr); | |
921 | sin_server.sin_port = htons(opts.port); | |
e75762fd RL |
922 | err = __sock_create(read_pnet(¤t->nsproxy->net_ns), PF_INET, |
923 | SOCK_STREAM, IPPROTO_TCP, &csocket, 1); | |
6b18662e | 924 | if (err) { |
5d385153 JP |
925 | pr_err("%s (%d): problem creating socket\n", |
926 | __func__, task_pid_nr(current)); | |
6b18662e | 927 | return err; |
a80d923e EVH |
928 | } |
929 | ||
930 | err = csocket->ops->connect(csocket, | |
931 | (struct sockaddr *)&sin_server, | |
932 | sizeof(struct sockaddr_in), 0); | |
933 | if (err < 0) { | |
5d385153 JP |
934 | pr_err("%s (%d): problem connecting socket to %s\n", |
935 | __func__, task_pid_nr(current), addr); | |
a80d923e | 936 | sock_release(csocket); |
6b18662e AV |
937 | return err; |
938 | } | |
a80d923e | 939 | |
6b18662e | 940 | return p9_socket_open(client, csocket); |
a80d923e EVH |
941 | } |
942 | ||
8b81ef58 EVH |
943 | static int |
944 | p9_fd_create_unix(struct p9_client *client, const char *addr, char *args) | |
a80d923e EVH |
945 | { |
946 | int err; | |
947 | struct socket *csocket; | |
948 | struct sockaddr_un sun_server; | |
a80d923e EVH |
949 | |
950 | csocket = NULL; | |
a80d923e | 951 | |
cff6b8a9 | 952 | if (strlen(addr) >= UNIX_PATH_MAX) { |
5d385153 JP |
953 | pr_err("%s (%d): address too long: %s\n", |
954 | __func__, task_pid_nr(current), addr); | |
6b18662e | 955 | return -ENAMETOOLONG; |
a80d923e EVH |
956 | } |
957 | ||
958 | sun_server.sun_family = PF_UNIX; | |
959 | strcpy(sun_server.sun_path, addr); | |
e75762fd RL |
960 | err = __sock_create(read_pnet(¤t->nsproxy->net_ns), PF_UNIX, |
961 | SOCK_STREAM, 0, &csocket, 1); | |
6b18662e | 962 | if (err < 0) { |
5d385153 JP |
963 | pr_err("%s (%d): problem creating socket\n", |
964 | __func__, task_pid_nr(current)); | |
965 | ||
6b18662e AV |
966 | return err; |
967 | } | |
a80d923e EVH |
968 | err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server, |
969 | sizeof(struct sockaddr_un) - 1, 0); | |
970 | if (err < 0) { | |
5d385153 JP |
971 | pr_err("%s (%d): problem connecting socket: %s: %d\n", |
972 | __func__, task_pid_nr(current), addr, err); | |
a80d923e | 973 | sock_release(csocket); |
6b18662e AV |
974 | return err; |
975 | } | |
a80d923e | 976 | |
6b18662e | 977 | return p9_socket_open(client, csocket); |
a80d923e EVH |
978 | } |
979 | ||
8b81ef58 EVH |
980 | static int |
981 | p9_fd_create(struct p9_client *client, const char *addr, char *args) | |
a80d923e EVH |
982 | { |
983 | int err; | |
a80d923e | 984 | struct p9_fd_opts opts; |
6b18662e | 985 | struct p9_trans_fd *p; |
a80d923e EVH |
986 | |
987 | parse_opts(args, &opts); | |
988 | ||
989 | if (opts.rfd == ~0 || opts.wfd == ~0) { | |
5d385153 | 990 | pr_err("Insufficient options for proto=fd\n"); |
8b81ef58 | 991 | return -ENOPROTOOPT; |
a80d923e EVH |
992 | } |
993 | ||
8b81ef58 | 994 | err = p9_fd_open(client, opts.rfd, opts.wfd); |
a80d923e | 995 | if (err < 0) |
6b18662e | 996 | return err; |
a80d923e | 997 | |
8b81ef58 EVH |
998 | p = (struct p9_trans_fd *) client->trans; |
999 | p->conn = p9_conn_create(client); | |
8a0dc95f EVH |
1000 | if (IS_ERR(p->conn)) { |
1001 | err = PTR_ERR(p->conn); | |
1002 | p->conn = NULL; | |
6b18662e AV |
1003 | fput(p->rd); |
1004 | fput(p->wr); | |
1005 | return err; | |
8a0dc95f EVH |
1006 | } |
1007 | ||
8b81ef58 | 1008 | return 0; |
a80d923e EVH |
1009 | } |
1010 | ||
1011 | static struct p9_trans_module p9_tcp_trans = { | |
1012 | .name = "tcp", | |
1013 | .maxsize = MAX_SOCK_BUF, | |
1014 | .def = 1, | |
8b81ef58 EVH |
1015 | .create = p9_fd_create_tcp, |
1016 | .close = p9_fd_close, | |
91b8534f EVH |
1017 | .request = p9_fd_request, |
1018 | .cancel = p9_fd_cancel, | |
72029fe8 | 1019 | .owner = THIS_MODULE, |
a80d923e EVH |
1020 | }; |
1021 | ||
1022 | static struct p9_trans_module p9_unix_trans = { | |
1023 | .name = "unix", | |
1024 | .maxsize = MAX_SOCK_BUF, | |
1025 | .def = 0, | |
8b81ef58 EVH |
1026 | .create = p9_fd_create_unix, |
1027 | .close = p9_fd_close, | |
91b8534f EVH |
1028 | .request = p9_fd_request, |
1029 | .cancel = p9_fd_cancel, | |
72029fe8 | 1030 | .owner = THIS_MODULE, |
a80d923e EVH |
1031 | }; |
1032 | ||
1033 | static struct p9_trans_module p9_fd_trans = { | |
1034 | .name = "fd", | |
1035 | .maxsize = MAX_SOCK_BUF, | |
1036 | .def = 0, | |
8b81ef58 EVH |
1037 | .create = p9_fd_create, |
1038 | .close = p9_fd_close, | |
91b8534f EVH |
1039 | .request = p9_fd_request, |
1040 | .cancel = p9_fd_cancel, | |
72029fe8 | 1041 | .owner = THIS_MODULE, |
a80d923e EVH |
1042 | }; |
1043 | ||
5503ac56 EVH |
1044 | /** |
1045 | * p9_poll_proc - poll worker thread | |
1046 | * @a: thread state and arguments | |
1047 | * | |
1048 | * polls all v9fs transports for new events and queues the appropriate | |
1049 | * work to the work queue | |
1050 | * | |
1051 | */ | |
1052 | ||
aa70c585 | 1053 | static void p9_poll_workfn(struct work_struct *work) |
5503ac56 EVH |
1054 | { |
1055 | unsigned long flags; | |
1056 | ||
5d385153 | 1057 | p9_debug(P9_DEBUG_TRANS, "start %p\n", current); |
aa70c585 | 1058 | |
5503ac56 EVH |
1059 | spin_lock_irqsave(&p9_poll_lock, flags); |
1060 | while (!list_empty(&p9_poll_pending_list)) { | |
1061 | struct p9_conn *conn = list_first_entry(&p9_poll_pending_list, | |
1062 | struct p9_conn, | |
1063 | poll_pending_link); | |
1064 | list_del_init(&conn->poll_pending_link); | |
1065 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
1066 | ||
1067 | p9_poll_mux(conn); | |
1068 | ||
1069 | spin_lock_irqsave(&p9_poll_lock, flags); | |
1070 | } | |
1071 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
1072 | ||
5d385153 | 1073 | p9_debug(P9_DEBUG_TRANS, "finish\n"); |
5503ac56 EVH |
1074 | } |
1075 | ||
887b3ece | 1076 | int p9_trans_fd_init(void) |
a80d923e EVH |
1077 | { |
1078 | v9fs_register_trans(&p9_tcp_trans); | |
1079 | v9fs_register_trans(&p9_unix_trans); | |
1080 | v9fs_register_trans(&p9_fd_trans); | |
1081 | ||
3387b804 | 1082 | return 0; |
a80d923e | 1083 | } |
72029fe8 TH |
1084 | |
1085 | void p9_trans_fd_exit(void) | |
1086 | { | |
aa70c585 | 1087 | flush_work_sync(&p9_poll_work); |
72029fe8 TH |
1088 | v9fs_unregister_trans(&p9_tcp_trans); |
1089 | v9fs_unregister_trans(&p9_unix_trans); | |
1090 | v9fs_unregister_trans(&p9_fd_trans); | |
1091 | } |