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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 | ||
28 | #include <linux/in.h> | |
29 | #include <linux/module.h> | |
30 | #include <linux/net.h> | |
31 | #include <linux/ipv6.h> | |
8a0dc95f | 32 | #include <linux/kthread.h> |
bd238fb4 LI |
33 | #include <linux/errno.h> |
34 | #include <linux/kernel.h> | |
35 | #include <linux/un.h> | |
36 | #include <linux/uaccess.h> | |
37 | #include <linux/inet.h> | |
38 | #include <linux/idr.h> | |
39 | #include <linux/file.h> | |
a80d923e | 40 | #include <linux/parser.h> |
bd238fb4 | 41 | #include <net/9p/9p.h> |
8b81ef58 | 42 | #include <net/9p/client.h> |
bd238fb4 LI |
43 | #include <net/9p/transport.h> |
44 | ||
45 | #define P9_PORT 564 | |
a80d923e | 46 | #define MAX_SOCK_BUF (64*1024) |
8a0dc95f | 47 | #define ERREQFLUSH 1 |
8a0dc95f | 48 | #define MAXPOLLWADDR 2 |
a80d923e | 49 | |
ee443996 EVH |
50 | /** |
51 | * struct p9_fd_opts - per-transport options | |
52 | * @rfd: file descriptor for reading (trans=fd) | |
53 | * @wfd: file descriptor for writing (trans=fd) | |
54 | * @port: port to connect to (trans=tcp) | |
55 | * | |
56 | */ | |
57 | ||
a80d923e EVH |
58 | struct p9_fd_opts { |
59 | int rfd; | |
60 | int wfd; | |
61 | u16 port; | |
62 | }; | |
bd238fb4 | 63 | |
ee443996 EVH |
64 | |
65 | /** | |
66 | * struct p9_trans_fd - transport state | |
67 | * @rd: reference to file to read from | |
68 | * @wr: reference of file to write to | |
69 | * @conn: connection state reference | |
70 | * | |
71 | */ | |
72 | ||
bd238fb4 LI |
73 | struct p9_trans_fd { |
74 | struct file *rd; | |
75 | struct file *wr; | |
8a0dc95f | 76 | struct p9_conn *conn; |
bd238fb4 LI |
77 | }; |
78 | ||
a80d923e EVH |
79 | /* |
80 | * Option Parsing (code inspired by NFS code) | |
81 | * - a little lazy - parse all fd-transport options | |
82 | */ | |
bd238fb4 | 83 | |
a80d923e EVH |
84 | enum { |
85 | /* Options that take integer arguments */ | |
55762690 | 86 | Opt_port, Opt_rfdno, Opt_wfdno, Opt_err, |
a80d923e | 87 | }; |
bd238fb4 | 88 | |
a447c093 | 89 | static const match_table_t tokens = { |
a80d923e EVH |
90 | {Opt_port, "port=%u"}, |
91 | {Opt_rfdno, "rfdno=%u"}, | |
92 | {Opt_wfdno, "wfdno=%u"}, | |
55762690 | 93 | {Opt_err, NULL}, |
a80d923e | 94 | }; |
bd238fb4 | 95 | |
8a0dc95f EVH |
96 | enum { |
97 | Rworksched = 1, /* read work scheduled or running */ | |
98 | Rpending = 2, /* can read */ | |
99 | Wworksched = 4, /* write work scheduled or running */ | |
100 | Wpending = 8, /* can write */ | |
101 | }; | |
102 | ||
103 | enum { | |
104 | None, | |
105 | Flushing, | |
106 | Flushed, | |
107 | }; | |
108 | ||
109 | struct p9_req; | |
8a0dc95f | 110 | typedef void (*p9_conn_req_callback)(struct p9_req *req, void *a); |
ee443996 EVH |
111 | |
112 | /** | |
113 | * struct p9_req - fd mux encoding of an rpc transaction | |
114 | * @lock: protects req_list | |
115 | * @tag: numeric tag for rpc transaction | |
116 | * @tcall: request &p9_fcall structure | |
117 | * @rcall: response &p9_fcall structure | |
118 | * @err: error state | |
119 | * @cb: callback for when response is received | |
120 | * @cba: argument to pass to callback | |
121 | * @flush: flag to indicate RPC has been flushed | |
122 | * @req_list: list link for higher level objects to chain requests | |
123 | * | |
124 | */ | |
125 | ||
8a0dc95f | 126 | struct p9_req { |
ee443996 | 127 | spinlock_t lock; |
8a0dc95f EVH |
128 | int tag; |
129 | struct p9_fcall *tcall; | |
130 | struct p9_fcall *rcall; | |
131 | int err; | |
132 | p9_conn_req_callback cb; | |
133 | void *cba; | |
134 | int flush; | |
135 | struct list_head req_list; | |
136 | }; | |
137 | ||
992b3f1d TH |
138 | struct p9_poll_wait { |
139 | struct p9_conn *conn; | |
140 | wait_queue_t wait; | |
141 | wait_queue_head_t *wait_addr; | |
ee443996 EVH |
142 | }; |
143 | ||
144 | /** | |
145 | * struct p9_conn - fd mux connection state information | |
146 | * @lock: protects mux_list (?) | |
147 | * @mux_list: list link for mux to manage multiple connections (?) | |
ee443996 EVH |
148 | * @msize: maximum size for connection (dup) |
149 | * @extended: 9p2000.u flag (dup) | |
8b81ef58 | 150 | * @client: reference to client instance for this connection |
ee443996 EVH |
151 | * @tagpool: id accounting for transactions |
152 | * @err: error state | |
ee443996 EVH |
153 | * @req_list: accounting for requests which have been sent |
154 | * @unsent_req_list: accounting for requests that haven't been sent | |
155 | * @rcall: current response &p9_fcall structure | |
156 | * @rpos: read position in current frame | |
157 | * @rbuf: current read buffer | |
158 | * @wpos: write position for current frame | |
159 | * @wsize: amount of data to write for current frame | |
160 | * @wbuf: current write buffer | |
161 | * @poll_wait: array of wait_q's for various worker threads | |
162 | * @poll_waddr: ???? | |
163 | * @pt: poll state | |
164 | * @rq: current read work | |
165 | * @wq: current write work | |
166 | * @wsched: ???? | |
167 | * | |
168 | */ | |
8a0dc95f EVH |
169 | |
170 | struct p9_conn { | |
171 | spinlock_t lock; /* protect lock structure */ | |
172 | struct list_head mux_list; | |
8a0dc95f EVH |
173 | int msize; |
174 | unsigned char extended; | |
8b81ef58 | 175 | struct p9_client *client; |
8a0dc95f EVH |
176 | struct p9_idpool *tagpool; |
177 | int err; | |
8a0dc95f EVH |
178 | struct list_head req_list; |
179 | struct list_head unsent_req_list; | |
180 | struct p9_fcall *rcall; | |
181 | int rpos; | |
182 | char *rbuf; | |
183 | int wpos; | |
184 | int wsize; | |
185 | char *wbuf; | |
992b3f1d TH |
186 | struct list_head poll_pending_link; |
187 | struct p9_poll_wait poll_wait[MAXPOLLWADDR]; | |
8a0dc95f EVH |
188 | poll_table pt; |
189 | struct work_struct rq; | |
190 | struct work_struct wq; | |
191 | unsigned long wsched; | |
192 | }; | |
193 | ||
ee443996 EVH |
194 | /** |
195 | * struct p9_mux_rpc - fd mux rpc accounting structure | |
196 | * @m: connection this request was issued on | |
197 | * @err: error state | |
198 | * @tcall: request &p9_fcall | |
199 | * @rcall: response &p9_fcall | |
200 | * @wqueue: wait queue that client is blocked on for this rpc | |
201 | * | |
202 | * Bug: isn't this information duplicated elsewhere like &p9_req | |
203 | */ | |
8a0dc95f EVH |
204 | |
205 | struct p9_mux_rpc { | |
206 | struct p9_conn *m; | |
207 | int err; | |
208 | struct p9_fcall *tcall; | |
209 | struct p9_fcall *rcall; | |
210 | wait_queue_head_t wqueue; | |
211 | }; | |
212 | ||
213 | static int p9_poll_proc(void *); | |
214 | static void p9_read_work(struct work_struct *work); | |
215 | static void p9_write_work(struct work_struct *work); | |
216 | static void p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, | |
217 | poll_table *p); | |
8b81ef58 EVH |
218 | static int p9_fd_write(struct p9_client *client, void *v, int len); |
219 | static int p9_fd_read(struct p9_client *client, void *v, int len); | |
8a0dc95f | 220 | |
992b3f1d TH |
221 | static DEFINE_SPINLOCK(p9_poll_lock); |
222 | static LIST_HEAD(p9_poll_pending_list); | |
8a0dc95f | 223 | static struct workqueue_struct *p9_mux_wq; |
992b3f1d | 224 | static struct task_struct *p9_poll_task; |
8a0dc95f EVH |
225 | |
226 | static void p9_conn_destroy(struct p9_conn *); | |
8b81ef58 | 227 | static unsigned int p9_fd_poll(struct p9_client *client, |
8a0dc95f EVH |
228 | struct poll_table_struct *pt); |
229 | ||
230 | #ifdef P9_NONBLOCK | |
231 | static int p9_conn_rpcnb(struct p9_conn *m, struct p9_fcall *tc, | |
232 | p9_conn_req_callback cb, void *a); | |
233 | #endif /* P9_NONBLOCK */ | |
234 | ||
235 | static void p9_conn_cancel(struct p9_conn *m, int err); | |
236 | ||
8a0dc95f EVH |
237 | static u16 p9_mux_get_tag(struct p9_conn *m) |
238 | { | |
239 | int tag; | |
240 | ||
241 | tag = p9_idpool_get(m->tagpool); | |
242 | if (tag < 0) | |
243 | return P9_NOTAG; | |
244 | else | |
245 | return (u16) tag; | |
246 | } | |
247 | ||
248 | static void p9_mux_put_tag(struct p9_conn *m, u16 tag) | |
249 | { | |
250 | if (tag != P9_NOTAG && p9_idpool_check(tag, m->tagpool)) | |
251 | p9_idpool_put(tag, m->tagpool); | |
252 | } | |
253 | ||
992b3f1d | 254 | static void p9_mux_poll_stop(struct p9_conn *m) |
8a0dc95f | 255 | { |
992b3f1d TH |
256 | unsigned long flags; |
257 | int i; | |
8a0dc95f | 258 | |
992b3f1d TH |
259 | for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { |
260 | struct p9_poll_wait *pwait = &m->poll_wait[i]; | |
8a0dc95f | 261 | |
992b3f1d TH |
262 | if (pwait->wait_addr) { |
263 | remove_wait_queue(pwait->wait_addr, &pwait->wait); | |
264 | pwait->wait_addr = NULL; | |
8a0dc95f | 265 | } |
8a0dc95f EVH |
266 | } |
267 | ||
992b3f1d TH |
268 | spin_lock_irqsave(&p9_poll_lock, flags); |
269 | list_del_init(&m->poll_pending_link); | |
270 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
8a0dc95f EVH |
271 | } |
272 | ||
273 | /** | |
274 | * p9_conn_create - allocate and initialize the per-session mux data | |
8b81ef58 | 275 | * @client: client instance |
8a0dc95f | 276 | * |
ee443996 | 277 | * Note: Creates the polling task if this is the first session. |
8a0dc95f | 278 | */ |
ee443996 | 279 | |
8b81ef58 | 280 | static struct p9_conn *p9_conn_create(struct p9_client *client) |
8a0dc95f EVH |
281 | { |
282 | int i, n; | |
571ffeaf | 283 | struct p9_conn *m; |
8a0dc95f | 284 | |
8b81ef58 | 285 | P9_DPRINTK(P9_DEBUG_MUX, "client %p msize %d\n", client, client->msize); |
571ffeaf | 286 | m = kzalloc(sizeof(struct p9_conn), GFP_KERNEL); |
8a0dc95f EVH |
287 | if (!m) |
288 | return ERR_PTR(-ENOMEM); | |
289 | ||
290 | spin_lock_init(&m->lock); | |
291 | INIT_LIST_HEAD(&m->mux_list); | |
8b81ef58 EVH |
292 | m->msize = client->msize; |
293 | m->extended = client->dotu; | |
294 | m->client = client; | |
8a0dc95f EVH |
295 | m->tagpool = p9_idpool_create(); |
296 | if (IS_ERR(m->tagpool)) { | |
8a0dc95f | 297 | kfree(m); |
571ffeaf | 298 | return ERR_PTR(-ENOMEM); |
8a0dc95f EVH |
299 | } |
300 | ||
8a0dc95f EVH |
301 | INIT_LIST_HEAD(&m->req_list); |
302 | INIT_LIST_HEAD(&m->unsent_req_list); | |
8a0dc95f EVH |
303 | INIT_WORK(&m->rq, p9_read_work); |
304 | INIT_WORK(&m->wq, p9_write_work); | |
992b3f1d TH |
305 | INIT_LIST_HEAD(&m->poll_pending_link); |
306 | init_poll_funcptr(&m->pt, p9_pollwait); | |
8a0dc95f | 307 | |
8b81ef58 | 308 | n = p9_fd_poll(client, &m->pt); |
8a0dc95f EVH |
309 | if (n & POLLIN) { |
310 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m); | |
311 | set_bit(Rpending, &m->wsched); | |
312 | } | |
313 | ||
314 | if (n & POLLOUT) { | |
315 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m); | |
316 | set_bit(Wpending, &m->wsched); | |
317 | } | |
318 | ||
992b3f1d TH |
319 | for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { |
320 | if (IS_ERR(m->poll_wait[i].wait_addr)) { | |
8a0dc95f | 321 | p9_mux_poll_stop(m); |
8a0dc95f | 322 | kfree(m); |
992b3f1d TH |
323 | /* return the error code */ |
324 | return (void *)m->poll_wait[i].wait_addr; | |
8a0dc95f EVH |
325 | } |
326 | } | |
327 | ||
328 | return m; | |
329 | } | |
330 | ||
331 | /** | |
332 | * p9_mux_destroy - cancels all pending requests and frees mux resources | |
ee443996 EVH |
333 | * @m: mux to destroy |
334 | * | |
8a0dc95f | 335 | */ |
ee443996 | 336 | |
8a0dc95f EVH |
337 | static void p9_conn_destroy(struct p9_conn *m) |
338 | { | |
339 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p prev %p next %p\n", m, | |
340 | m->mux_list.prev, m->mux_list.next); | |
8a0dc95f EVH |
341 | |
342 | p9_mux_poll_stop(m); | |
7dc5d24b TH |
343 | cancel_work_sync(&m->rq); |
344 | cancel_work_sync(&m->wq); | |
345 | ||
346 | p9_conn_cancel(m, -ECONNRESET); | |
347 | ||
8b81ef58 | 348 | m->client = NULL; |
8a0dc95f EVH |
349 | p9_idpool_destroy(m->tagpool); |
350 | kfree(m); | |
351 | } | |
352 | ||
992b3f1d TH |
353 | static int p9_pollwake(wait_queue_t *wait, unsigned mode, int sync, void *key) |
354 | { | |
355 | struct p9_poll_wait *pwait = | |
356 | container_of(wait, struct p9_poll_wait, wait); | |
357 | struct p9_conn *m = pwait->conn; | |
358 | unsigned long flags; | |
359 | DECLARE_WAITQUEUE(dummy_wait, p9_poll_task); | |
360 | ||
361 | spin_lock_irqsave(&p9_poll_lock, flags); | |
362 | if (list_empty(&m->poll_pending_link)) | |
363 | list_add_tail(&m->poll_pending_link, &p9_poll_pending_list); | |
364 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
365 | ||
366 | /* perform the default wake up operation */ | |
367 | return default_wake_function(&dummy_wait, mode, sync, key); | |
368 | } | |
369 | ||
8a0dc95f | 370 | /** |
ee443996 EVH |
371 | * p9_pollwait - add poll task to the wait queue |
372 | * @filp: file pointer being polled | |
373 | * @wait_address: wait_q to block on | |
374 | * @p: poll state | |
375 | * | |
376 | * called by files poll operation to add v9fs-poll task to files wait queue | |
8a0dc95f | 377 | */ |
ee443996 | 378 | |
8a0dc95f EVH |
379 | static void |
380 | p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p) | |
381 | { | |
992b3f1d TH |
382 | struct p9_conn *m = container_of(p, struct p9_conn, pt); |
383 | struct p9_poll_wait *pwait = NULL; | |
8a0dc95f | 384 | int i; |
8a0dc95f | 385 | |
992b3f1d TH |
386 | for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { |
387 | if (m->poll_wait[i].wait_addr == NULL) { | |
388 | pwait = &m->poll_wait[i]; | |
8a0dc95f | 389 | break; |
992b3f1d TH |
390 | } |
391 | } | |
8a0dc95f | 392 | |
992b3f1d | 393 | if (!pwait) { |
8a0dc95f EVH |
394 | P9_DPRINTK(P9_DEBUG_ERROR, "not enough wait_address slots\n"); |
395 | return; | |
396 | } | |
397 | ||
8a0dc95f EVH |
398 | if (!wait_address) { |
399 | P9_DPRINTK(P9_DEBUG_ERROR, "no wait_address\n"); | |
992b3f1d | 400 | pwait->wait_addr = ERR_PTR(-EIO); |
8a0dc95f EVH |
401 | return; |
402 | } | |
403 | ||
992b3f1d TH |
404 | pwait->conn = m; |
405 | pwait->wait_addr = wait_address; | |
406 | init_waitqueue_func_entry(&pwait->wait, p9_pollwake); | |
407 | add_wait_queue(wait_address, &pwait->wait); | |
8a0dc95f EVH |
408 | } |
409 | ||
410 | /** | |
411 | * p9_poll_mux - polls a mux and schedules read or write works if necessary | |
ee443996 EVH |
412 | * @m: connection to poll |
413 | * | |
8a0dc95f | 414 | */ |
ee443996 | 415 | |
8a0dc95f EVH |
416 | static void p9_poll_mux(struct p9_conn *m) |
417 | { | |
418 | int n; | |
419 | ||
420 | if (m->err < 0) | |
421 | return; | |
422 | ||
8b81ef58 | 423 | n = p9_fd_poll(m->client, NULL); |
8a0dc95f EVH |
424 | if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) { |
425 | P9_DPRINTK(P9_DEBUG_MUX, "error mux %p err %d\n", m, n); | |
426 | if (n >= 0) | |
427 | n = -ECONNRESET; | |
428 | p9_conn_cancel(m, n); | |
429 | } | |
430 | ||
431 | if (n & POLLIN) { | |
432 | set_bit(Rpending, &m->wsched); | |
433 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m); | |
434 | if (!test_and_set_bit(Rworksched, &m->wsched)) { | |
435 | P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m); | |
436 | queue_work(p9_mux_wq, &m->rq); | |
437 | } | |
438 | } | |
439 | ||
440 | if (n & POLLOUT) { | |
441 | set_bit(Wpending, &m->wsched); | |
442 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m); | |
443 | if ((m->wsize || !list_empty(&m->unsent_req_list)) | |
444 | && !test_and_set_bit(Wworksched, &m->wsched)) { | |
445 | P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m); | |
446 | queue_work(p9_mux_wq, &m->wq); | |
447 | } | |
448 | } | |
449 | } | |
450 | ||
451 | /** | |
ee443996 EVH |
452 | * p9_poll_proc - poll worker thread |
453 | * @a: thread state and arguments | |
454 | * | |
455 | * polls all v9fs transports for new events and queues the appropriate | |
456 | * work to the work queue | |
457 | * | |
8a0dc95f | 458 | */ |
ee443996 | 459 | |
8a0dc95f EVH |
460 | static int p9_poll_proc(void *a) |
461 | { | |
992b3f1d | 462 | unsigned long flags; |
8a0dc95f | 463 | |
992b3f1d TH |
464 | P9_DPRINTK(P9_DEBUG_MUX, "start %p\n", current); |
465 | repeat: | |
466 | spin_lock_irqsave(&p9_poll_lock, flags); | |
467 | while (!list_empty(&p9_poll_pending_list)) { | |
468 | struct p9_conn *conn = list_first_entry(&p9_poll_pending_list, | |
469 | struct p9_conn, | |
470 | poll_pending_link); | |
471 | list_del_init(&conn->poll_pending_link); | |
472 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
8a0dc95f | 473 | |
992b3f1d | 474 | p9_poll_mux(conn); |
8a0dc95f | 475 | |
992b3f1d | 476 | spin_lock_irqsave(&p9_poll_lock, flags); |
8a0dc95f | 477 | } |
992b3f1d | 478 | spin_unlock_irqrestore(&p9_poll_lock, flags); |
8a0dc95f | 479 | |
992b3f1d TH |
480 | set_current_state(TASK_INTERRUPTIBLE); |
481 | if (list_empty(&p9_poll_pending_list)) { | |
482 | P9_DPRINTK(P9_DEBUG_MUX, "sleeping...\n"); | |
483 | schedule(); | |
484 | } | |
8a0dc95f | 485 | __set_current_state(TASK_RUNNING); |
992b3f1d TH |
486 | |
487 | if (!kthread_should_stop()) | |
488 | goto repeat; | |
489 | ||
8a0dc95f EVH |
490 | P9_DPRINTK(P9_DEBUG_MUX, "finish\n"); |
491 | return 0; | |
492 | } | |
493 | ||
494 | /** | |
495 | * p9_write_work - called when a transport can send some data | |
ee443996 EVH |
496 | * @work: container for work to be done |
497 | * | |
8a0dc95f | 498 | */ |
ee443996 | 499 | |
8a0dc95f EVH |
500 | static void p9_write_work(struct work_struct *work) |
501 | { | |
502 | int n, err; | |
503 | struct p9_conn *m; | |
504 | struct p9_req *req; | |
505 | ||
506 | m = container_of(work, struct p9_conn, wq); | |
507 | ||
508 | if (m->err < 0) { | |
509 | clear_bit(Wworksched, &m->wsched); | |
510 | return; | |
511 | } | |
512 | ||
513 | if (!m->wsize) { | |
514 | if (list_empty(&m->unsent_req_list)) { | |
515 | clear_bit(Wworksched, &m->wsched); | |
516 | return; | |
517 | } | |
518 | ||
519 | spin_lock(&m->lock); | |
520 | again: | |
521 | req = list_entry(m->unsent_req_list.next, struct p9_req, | |
522 | req_list); | |
523 | list_move_tail(&req->req_list, &m->req_list); | |
524 | if (req->err == ERREQFLUSH) | |
525 | goto again; | |
526 | ||
527 | m->wbuf = req->tcall->sdata; | |
528 | m->wsize = req->tcall->size; | |
529 | m->wpos = 0; | |
530 | spin_unlock(&m->lock); | |
531 | } | |
532 | ||
533 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p pos %d size %d\n", m, m->wpos, | |
534 | m->wsize); | |
535 | clear_bit(Wpending, &m->wsched); | |
8b81ef58 | 536 | err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos); |
8a0dc95f EVH |
537 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p sent %d bytes\n", m, err); |
538 | if (err == -EAGAIN) { | |
539 | clear_bit(Wworksched, &m->wsched); | |
540 | return; | |
541 | } | |
542 | ||
543 | if (err < 0) | |
544 | goto error; | |
545 | else if (err == 0) { | |
546 | err = -EREMOTEIO; | |
547 | goto error; | |
548 | } | |
549 | ||
550 | m->wpos += err; | |
551 | if (m->wpos == m->wsize) | |
552 | m->wpos = m->wsize = 0; | |
553 | ||
554 | if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) { | |
555 | if (test_and_clear_bit(Wpending, &m->wsched)) | |
556 | n = POLLOUT; | |
557 | else | |
8b81ef58 | 558 | n = p9_fd_poll(m->client, NULL); |
8a0dc95f EVH |
559 | |
560 | if (n & POLLOUT) { | |
561 | P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m); | |
562 | queue_work(p9_mux_wq, &m->wq); | |
563 | } else | |
564 | clear_bit(Wworksched, &m->wsched); | |
565 | } else | |
566 | clear_bit(Wworksched, &m->wsched); | |
567 | ||
568 | return; | |
569 | ||
570 | error: | |
571 | p9_conn_cancel(m, err); | |
572 | clear_bit(Wworksched, &m->wsched); | |
573 | } | |
574 | ||
575 | static void process_request(struct p9_conn *m, struct p9_req *req) | |
576 | { | |
577 | int ecode; | |
578 | struct p9_str *ename; | |
579 | ||
580 | if (!req->err && req->rcall->id == P9_RERROR) { | |
581 | ecode = req->rcall->params.rerror.errno; | |
582 | ename = &req->rcall->params.rerror.error; | |
583 | ||
584 | P9_DPRINTK(P9_DEBUG_MUX, "Rerror %.*s\n", ename->len, | |
585 | ename->str); | |
586 | ||
587 | if (m->extended) | |
588 | req->err = -ecode; | |
589 | ||
590 | if (!req->err) { | |
591 | req->err = p9_errstr2errno(ename->str, ename->len); | |
592 | ||
593 | /* string match failed */ | |
594 | if (!req->err) { | |
595 | PRINT_FCALL_ERROR("unknown error", req->rcall); | |
596 | req->err = -ESERVERFAULT; | |
597 | } | |
598 | } | |
599 | } else if (req->tcall && req->rcall->id != req->tcall->id + 1) { | |
600 | P9_DPRINTK(P9_DEBUG_ERROR, | |
601 | "fcall mismatch: expected %d, got %d\n", | |
602 | req->tcall->id + 1, req->rcall->id); | |
603 | if (!req->err) | |
604 | req->err = -EIO; | |
605 | } | |
606 | } | |
607 | ||
608 | /** | |
609 | * p9_read_work - called when there is some data to be read from a transport | |
ee443996 EVH |
610 | * @work: container of work to be done |
611 | * | |
8a0dc95f | 612 | */ |
ee443996 | 613 | |
8a0dc95f EVH |
614 | static void p9_read_work(struct work_struct *work) |
615 | { | |
616 | int n, err; | |
617 | struct p9_conn *m; | |
618 | struct p9_req *req, *rptr, *rreq; | |
619 | struct p9_fcall *rcall; | |
620 | char *rbuf; | |
621 | ||
622 | m = container_of(work, struct p9_conn, rq); | |
623 | ||
624 | if (m->err < 0) | |
625 | return; | |
626 | ||
627 | rcall = NULL; | |
628 | P9_DPRINTK(P9_DEBUG_MUX, "start mux %p pos %d\n", m, m->rpos); | |
629 | ||
630 | if (!m->rcall) { | |
631 | m->rcall = | |
632 | kmalloc(sizeof(struct p9_fcall) + m->msize, GFP_KERNEL); | |
633 | if (!m->rcall) { | |
634 | err = -ENOMEM; | |
635 | goto error; | |
636 | } | |
637 | ||
638 | m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall); | |
639 | m->rpos = 0; | |
640 | } | |
641 | ||
642 | clear_bit(Rpending, &m->wsched); | |
8b81ef58 | 643 | err = p9_fd_read(m->client, m->rbuf + m->rpos, m->msize - m->rpos); |
8a0dc95f EVH |
644 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p got %d bytes\n", m, err); |
645 | if (err == -EAGAIN) { | |
646 | clear_bit(Rworksched, &m->wsched); | |
647 | return; | |
648 | } | |
649 | ||
650 | if (err <= 0) | |
651 | goto error; | |
652 | ||
653 | m->rpos += err; | |
654 | while (m->rpos > 4) { | |
655 | n = le32_to_cpu(*(__le32 *) m->rbuf); | |
656 | if (n >= m->msize) { | |
657 | P9_DPRINTK(P9_DEBUG_ERROR, | |
658 | "requested packet size too big: %d\n", n); | |
659 | err = -EIO; | |
660 | goto error; | |
661 | } | |
662 | ||
663 | if (m->rpos < n) | |
664 | break; | |
665 | ||
666 | err = | |
667 | p9_deserialize_fcall(m->rbuf, n, m->rcall, m->extended); | |
668 | if (err < 0) | |
669 | goto error; | |
670 | ||
671 | #ifdef CONFIG_NET_9P_DEBUG | |
672 | if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) { | |
673 | char buf[150]; | |
674 | ||
675 | p9_printfcall(buf, sizeof(buf), m->rcall, | |
676 | m->extended); | |
677 | printk(KERN_NOTICE ">>> %p %s\n", m, buf); | |
678 | } | |
679 | #endif | |
680 | ||
681 | rcall = m->rcall; | |
682 | rbuf = m->rbuf; | |
683 | if (m->rpos > n) { | |
684 | m->rcall = kmalloc(sizeof(struct p9_fcall) + m->msize, | |
685 | GFP_KERNEL); | |
686 | if (!m->rcall) { | |
687 | err = -ENOMEM; | |
688 | goto error; | |
689 | } | |
690 | ||
691 | m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall); | |
692 | memmove(m->rbuf, rbuf + n, m->rpos - n); | |
693 | m->rpos -= n; | |
694 | } else { | |
695 | m->rcall = NULL; | |
696 | m->rbuf = NULL; | |
697 | m->rpos = 0; | |
698 | } | |
699 | ||
700 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p fcall id %d tag %d\n", m, | |
701 | rcall->id, rcall->tag); | |
702 | ||
703 | req = NULL; | |
704 | spin_lock(&m->lock); | |
705 | list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) { | |
706 | if (rreq->tag == rcall->tag) { | |
707 | req = rreq; | |
708 | if (req->flush != Flushing) | |
709 | list_del(&req->req_list); | |
710 | break; | |
711 | } | |
712 | } | |
713 | spin_unlock(&m->lock); | |
714 | ||
715 | if (req) { | |
716 | req->rcall = rcall; | |
717 | process_request(m, req); | |
718 | ||
719 | if (req->flush != Flushing) { | |
720 | if (req->cb) | |
721 | (*req->cb) (req, req->cba); | |
722 | else | |
723 | kfree(req->rcall); | |
8a0dc95f EVH |
724 | } |
725 | } else { | |
726 | if (err >= 0 && rcall->id != P9_RFLUSH) | |
727 | P9_DPRINTK(P9_DEBUG_ERROR, | |
728 | "unexpected response mux %p id %d tag %d\n", | |
729 | m, rcall->id, rcall->tag); | |
730 | kfree(rcall); | |
731 | } | |
732 | } | |
733 | ||
734 | if (!list_empty(&m->req_list)) { | |
735 | if (test_and_clear_bit(Rpending, &m->wsched)) | |
736 | n = POLLIN; | |
737 | else | |
8b81ef58 | 738 | n = p9_fd_poll(m->client, NULL); |
8a0dc95f EVH |
739 | |
740 | if (n & POLLIN) { | |
741 | P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m); | |
742 | queue_work(p9_mux_wq, &m->rq); | |
743 | } else | |
744 | clear_bit(Rworksched, &m->wsched); | |
745 | } else | |
746 | clear_bit(Rworksched, &m->wsched); | |
747 | ||
748 | return; | |
749 | ||
750 | error: | |
751 | p9_conn_cancel(m, err); | |
752 | clear_bit(Rworksched, &m->wsched); | |
753 | } | |
754 | ||
755 | /** | |
756 | * p9_send_request - send 9P request | |
757 | * The function can sleep until the request is scheduled for sending. | |
758 | * The function can be interrupted. Return from the function is not | |
759 | * a guarantee that the request is sent successfully. Can return errors | |
760 | * that can be retrieved by PTR_ERR macros. | |
761 | * | |
762 | * @m: mux data | |
763 | * @tc: request to be sent | |
764 | * @cb: callback function to call when response is received | |
765 | * @cba: parameter to pass to the callback function | |
ee443996 | 766 | * |
8a0dc95f | 767 | */ |
ee443996 | 768 | |
8a0dc95f EVH |
769 | static struct p9_req *p9_send_request(struct p9_conn *m, |
770 | struct p9_fcall *tc, | |
771 | p9_conn_req_callback cb, void *cba) | |
772 | { | |
773 | int n; | |
774 | struct p9_req *req; | |
775 | ||
776 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p task %p tcall %p id %d\n", m, current, | |
777 | tc, tc->id); | |
778 | if (m->err < 0) | |
779 | return ERR_PTR(m->err); | |
780 | ||
781 | req = kmalloc(sizeof(struct p9_req), GFP_KERNEL); | |
782 | if (!req) | |
783 | return ERR_PTR(-ENOMEM); | |
784 | ||
785 | if (tc->id == P9_TVERSION) | |
786 | n = P9_NOTAG; | |
787 | else | |
788 | n = p9_mux_get_tag(m); | |
789 | ||
62067824 JL |
790 | if (n < 0) { |
791 | kfree(req); | |
8a0dc95f | 792 | return ERR_PTR(-ENOMEM); |
62067824 | 793 | } |
8a0dc95f EVH |
794 | |
795 | p9_set_tag(tc, n); | |
796 | ||
797 | #ifdef CONFIG_NET_9P_DEBUG | |
798 | if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) { | |
799 | char buf[150]; | |
800 | ||
801 | p9_printfcall(buf, sizeof(buf), tc, m->extended); | |
802 | printk(KERN_NOTICE "<<< %p %s\n", m, buf); | |
803 | } | |
804 | #endif | |
805 | ||
806 | spin_lock_init(&req->lock); | |
807 | req->tag = n; | |
808 | req->tcall = tc; | |
809 | req->rcall = NULL; | |
810 | req->err = 0; | |
811 | req->cb = cb; | |
812 | req->cba = cba; | |
813 | req->flush = None; | |
814 | ||
815 | spin_lock(&m->lock); | |
816 | list_add_tail(&req->req_list, &m->unsent_req_list); | |
817 | spin_unlock(&m->lock); | |
818 | ||
819 | if (test_and_clear_bit(Wpending, &m->wsched)) | |
820 | n = POLLOUT; | |
821 | else | |
8b81ef58 | 822 | n = p9_fd_poll(m->client, NULL); |
8a0dc95f EVH |
823 | |
824 | if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched)) | |
825 | queue_work(p9_mux_wq, &m->wq); | |
826 | ||
827 | return req; | |
828 | } | |
829 | ||
830 | static void p9_mux_free_request(struct p9_conn *m, struct p9_req *req) | |
831 | { | |
832 | p9_mux_put_tag(m, req->tag); | |
833 | kfree(req); | |
834 | } | |
835 | ||
836 | static void p9_mux_flush_cb(struct p9_req *freq, void *a) | |
837 | { | |
8a0dc95f EVH |
838 | int tag; |
839 | struct p9_conn *m; | |
840 | struct p9_req *req, *rreq, *rptr; | |
841 | ||
842 | m = a; | |
843 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p rc %p err %d oldtag %d\n", m, | |
844 | freq->tcall, freq->rcall, freq->err, | |
845 | freq->tcall->params.tflush.oldtag); | |
846 | ||
847 | spin_lock(&m->lock); | |
8a0dc95f EVH |
848 | tag = freq->tcall->params.tflush.oldtag; |
849 | req = NULL; | |
850 | list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) { | |
851 | if (rreq->tag == tag) { | |
852 | req = rreq; | |
853 | list_del(&req->req_list); | |
854 | break; | |
855 | } | |
856 | } | |
857 | spin_unlock(&m->lock); | |
858 | ||
859 | if (req) { | |
860 | spin_lock(&req->lock); | |
861 | req->flush = Flushed; | |
862 | spin_unlock(&req->lock); | |
863 | ||
864 | if (req->cb) | |
865 | (*req->cb) (req, req->cba); | |
866 | else | |
867 | kfree(req->rcall); | |
8a0dc95f EVH |
868 | } |
869 | ||
870 | kfree(freq->tcall); | |
871 | kfree(freq->rcall); | |
872 | p9_mux_free_request(m, freq); | |
873 | } | |
874 | ||
875 | static int | |
876 | p9_mux_flush_request(struct p9_conn *m, struct p9_req *req) | |
877 | { | |
878 | struct p9_fcall *fc; | |
879 | struct p9_req *rreq, *rptr; | |
880 | ||
881 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p req %p tag %d\n", m, req, req->tag); | |
882 | ||
883 | /* if a response was received for a request, do nothing */ | |
884 | spin_lock(&req->lock); | |
885 | if (req->rcall || req->err) { | |
886 | spin_unlock(&req->lock); | |
887 | P9_DPRINTK(P9_DEBUG_MUX, | |
888 | "mux %p req %p response already received\n", m, req); | |
889 | return 0; | |
890 | } | |
891 | ||
892 | req->flush = Flushing; | |
893 | spin_unlock(&req->lock); | |
894 | ||
895 | spin_lock(&m->lock); | |
896 | /* if the request is not sent yet, just remove it from the list */ | |
897 | list_for_each_entry_safe(rreq, rptr, &m->unsent_req_list, req_list) { | |
898 | if (rreq->tag == req->tag) { | |
899 | P9_DPRINTK(P9_DEBUG_MUX, | |
900 | "mux %p req %p request is not sent yet\n", m, req); | |
901 | list_del(&rreq->req_list); | |
902 | req->flush = Flushed; | |
903 | spin_unlock(&m->lock); | |
904 | if (req->cb) | |
905 | (*req->cb) (req, req->cba); | |
906 | return 0; | |
907 | } | |
908 | } | |
909 | spin_unlock(&m->lock); | |
910 | ||
911 | clear_thread_flag(TIF_SIGPENDING); | |
912 | fc = p9_create_tflush(req->tag); | |
913 | p9_send_request(m, fc, p9_mux_flush_cb, m); | |
914 | return 1; | |
915 | } | |
916 | ||
917 | static void | |
918 | p9_conn_rpc_cb(struct p9_req *req, void *a) | |
919 | { | |
920 | struct p9_mux_rpc *r; | |
921 | ||
922 | P9_DPRINTK(P9_DEBUG_MUX, "req %p r %p\n", req, a); | |
923 | r = a; | |
924 | r->rcall = req->rcall; | |
925 | r->err = req->err; | |
926 | ||
927 | if (req->flush != None && !req->err) | |
928 | r->err = -ERESTARTSYS; | |
929 | ||
930 | wake_up(&r->wqueue); | |
931 | } | |
932 | ||
933 | /** | |
934 | * p9_fd_rpc- sends 9P request and waits until a response is available. | |
935 | * The function can be interrupted. | |
8b81ef58 | 936 | * @client: client instance |
8a0dc95f EVH |
937 | * @tc: request to be sent |
938 | * @rc: pointer where a pointer to the response is stored | |
ee443996 | 939 | * |
8a0dc95f | 940 | */ |
ee443996 | 941 | |
8a0dc95f | 942 | int |
8b81ef58 | 943 | p9_fd_rpc(struct p9_client *client, struct p9_fcall *tc, struct p9_fcall **rc) |
8a0dc95f | 944 | { |
8b81ef58 | 945 | struct p9_trans_fd *p = client->trans; |
8a0dc95f EVH |
946 | struct p9_conn *m = p->conn; |
947 | int err, sigpending; | |
948 | unsigned long flags; | |
949 | struct p9_req *req; | |
950 | struct p9_mux_rpc r; | |
951 | ||
952 | r.err = 0; | |
953 | r.tcall = tc; | |
954 | r.rcall = NULL; | |
955 | r.m = m; | |
956 | init_waitqueue_head(&r.wqueue); | |
957 | ||
958 | if (rc) | |
959 | *rc = NULL; | |
960 | ||
961 | sigpending = 0; | |
962 | if (signal_pending(current)) { | |
963 | sigpending = 1; | |
964 | clear_thread_flag(TIF_SIGPENDING); | |
965 | } | |
966 | ||
967 | req = p9_send_request(m, tc, p9_conn_rpc_cb, &r); | |
968 | if (IS_ERR(req)) { | |
969 | err = PTR_ERR(req); | |
970 | P9_DPRINTK(P9_DEBUG_MUX, "error %d\n", err); | |
971 | return err; | |
972 | } | |
973 | ||
974 | err = wait_event_interruptible(r.wqueue, r.rcall != NULL || r.err < 0); | |
975 | if (r.err < 0) | |
976 | err = r.err; | |
977 | ||
8b81ef58 | 978 | if (err == -ERESTARTSYS && client->status == Connected |
8a0dc95f EVH |
979 | && m->err == 0) { |
980 | if (p9_mux_flush_request(m, req)) { | |
981 | /* wait until we get response of the flush message */ | |
982 | do { | |
983 | clear_thread_flag(TIF_SIGPENDING); | |
984 | err = wait_event_interruptible(r.wqueue, | |
985 | r.rcall || r.err); | |
986 | } while (!r.rcall && !r.err && err == -ERESTARTSYS && | |
8b81ef58 | 987 | client->status == Connected && !m->err); |
8a0dc95f EVH |
988 | |
989 | err = -ERESTARTSYS; | |
990 | } | |
991 | sigpending = 1; | |
992 | } | |
993 | ||
994 | if (sigpending) { | |
995 | spin_lock_irqsave(¤t->sighand->siglock, flags); | |
996 | recalc_sigpending(); | |
997 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); | |
998 | } | |
999 | ||
1000 | if (rc) | |
1001 | *rc = r.rcall; | |
1002 | else | |
1003 | kfree(r.rcall); | |
1004 | ||
1005 | p9_mux_free_request(m, req); | |
1006 | if (err > 0) | |
1007 | err = -EIO; | |
1008 | ||
1009 | return err; | |
1010 | } | |
1011 | ||
1012 | #ifdef P9_NONBLOCK | |
1013 | /** | |
1014 | * p9_conn_rpcnb - sends 9P request without waiting for response. | |
1015 | * @m: mux data | |
1016 | * @tc: request to be sent | |
1017 | * @cb: callback function to be called when response arrives | |
ee443996 EVH |
1018 | * @a: value to pass to the callback function |
1019 | * | |
8a0dc95f | 1020 | */ |
ee443996 | 1021 | |
8a0dc95f EVH |
1022 | int p9_conn_rpcnb(struct p9_conn *m, struct p9_fcall *tc, |
1023 | p9_conn_req_callback cb, void *a) | |
1024 | { | |
1025 | int err; | |
1026 | struct p9_req *req; | |
1027 | ||
1028 | req = p9_send_request(m, tc, cb, a); | |
1029 | if (IS_ERR(req)) { | |
1030 | err = PTR_ERR(req); | |
1031 | P9_DPRINTK(P9_DEBUG_MUX, "error %d\n", err); | |
1032 | return PTR_ERR(req); | |
1033 | } | |
1034 | ||
1035 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p tag %d\n", m, tc, req->tag); | |
1036 | return 0; | |
1037 | } | |
1038 | #endif /* P9_NONBLOCK */ | |
1039 | ||
1040 | /** | |
1041 | * p9_conn_cancel - cancel all pending requests with error | |
1042 | * @m: mux data | |
1043 | * @err: error code | |
ee443996 | 1044 | * |
8a0dc95f | 1045 | */ |
ee443996 | 1046 | |
8a0dc95f EVH |
1047 | void p9_conn_cancel(struct p9_conn *m, int err) |
1048 | { | |
1049 | struct p9_req *req, *rtmp; | |
1050 | LIST_HEAD(cancel_list); | |
1051 | ||
1052 | P9_DPRINTK(P9_DEBUG_ERROR, "mux %p err %d\n", m, err); | |
1053 | m->err = err; | |
1054 | spin_lock(&m->lock); | |
1055 | list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) { | |
1056 | list_move(&req->req_list, &cancel_list); | |
1057 | } | |
1058 | list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) { | |
1059 | list_move(&req->req_list, &cancel_list); | |
1060 | } | |
1061 | spin_unlock(&m->lock); | |
1062 | ||
1063 | list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) { | |
1064 | list_del(&req->req_list); | |
1065 | if (!req->err) | |
1066 | req->err = err; | |
1067 | ||
1068 | if (req->cb) | |
1069 | (*req->cb) (req, req->cba); | |
1070 | else | |
1071 | kfree(req->rcall); | |
1072 | } | |
8a0dc95f EVH |
1073 | } |
1074 | ||
a80d923e | 1075 | /** |
bb8ffdfc | 1076 | * parse_options - parse mount options into session structure |
a80d923e | 1077 | * @options: options string passed from mount |
ee443996 | 1078 | * @opts: transport-specific structure to parse options into |
a80d923e | 1079 | * |
bb8ffdfc | 1080 | * Returns 0 upon success, -ERRNO upon failure |
a80d923e | 1081 | */ |
bd238fb4 | 1082 | |
bb8ffdfc | 1083 | static int parse_opts(char *params, struct p9_fd_opts *opts) |
bd238fb4 | 1084 | { |
a80d923e EVH |
1085 | char *p; |
1086 | substring_t args[MAX_OPT_ARGS]; | |
1087 | int option; | |
bb8ffdfc | 1088 | char *options; |
a80d923e | 1089 | int ret; |
bd238fb4 | 1090 | |
a80d923e EVH |
1091 | opts->port = P9_PORT; |
1092 | opts->rfd = ~0; | |
1093 | opts->wfd = ~0; | |
bd238fb4 | 1094 | |
bb8ffdfc EVH |
1095 | if (!params) |
1096 | return 0; | |
1097 | ||
1098 | options = kstrdup(params, GFP_KERNEL); | |
1099 | if (!options) { | |
1100 | P9_DPRINTK(P9_DEBUG_ERROR, | |
1101 | "failed to allocate copy of option string\n"); | |
1102 | return -ENOMEM; | |
1103 | } | |
bd238fb4 | 1104 | |
a80d923e EVH |
1105 | while ((p = strsep(&options, ",")) != NULL) { |
1106 | int token; | |
bb8ffdfc | 1107 | int r; |
a80d923e EVH |
1108 | if (!*p) |
1109 | continue; | |
1110 | token = match_token(p, tokens, args); | |
bb8ffdfc EVH |
1111 | r = match_int(&args[0], &option); |
1112 | if (r < 0) { | |
a80d923e EVH |
1113 | P9_DPRINTK(P9_DEBUG_ERROR, |
1114 | "integer field, but no integer?\n"); | |
bb8ffdfc | 1115 | ret = r; |
a80d923e EVH |
1116 | continue; |
1117 | } | |
1118 | switch (token) { | |
1119 | case Opt_port: | |
1120 | opts->port = option; | |
1121 | break; | |
1122 | case Opt_rfdno: | |
1123 | opts->rfd = option; | |
1124 | break; | |
1125 | case Opt_wfdno: | |
1126 | opts->wfd = option; | |
1127 | break; | |
1128 | default: | |
1129 | continue; | |
1130 | } | |
bd238fb4 | 1131 | } |
bb8ffdfc EVH |
1132 | kfree(options); |
1133 | return 0; | |
bd238fb4 | 1134 | } |
bd238fb4 | 1135 | |
8b81ef58 | 1136 | static int p9_fd_open(struct p9_client *client, int rfd, int wfd) |
bd238fb4 | 1137 | { |
a80d923e EVH |
1138 | struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd), |
1139 | GFP_KERNEL); | |
1140 | if (!ts) | |
1141 | return -ENOMEM; | |
bd238fb4 | 1142 | |
a80d923e EVH |
1143 | ts->rd = fget(rfd); |
1144 | ts->wr = fget(wfd); | |
1145 | if (!ts->rd || !ts->wr) { | |
1146 | if (ts->rd) | |
1147 | fput(ts->rd); | |
1148 | if (ts->wr) | |
1149 | fput(ts->wr); | |
1150 | kfree(ts); | |
1151 | return -EIO; | |
bd238fb4 LI |
1152 | } |
1153 | ||
8b81ef58 EVH |
1154 | client->trans = ts; |
1155 | client->status = Connected; | |
bd238fb4 | 1156 | |
a80d923e | 1157 | return 0; |
bd238fb4 | 1158 | } |
bd238fb4 | 1159 | |
8b81ef58 | 1160 | static int p9_socket_open(struct p9_client *client, struct socket *csocket) |
bd238fb4 LI |
1161 | { |
1162 | int fd, ret; | |
1163 | ||
1164 | csocket->sk->sk_allocation = GFP_NOIO; | |
a677a039 | 1165 | fd = sock_map_fd(csocket, 0); |
bd238fb4 LI |
1166 | if (fd < 0) { |
1167 | P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n"); | |
1168 | return fd; | |
1169 | } | |
1170 | ||
8b81ef58 | 1171 | ret = p9_fd_open(client, fd, fd); |
bd238fb4 LI |
1172 | if (ret < 0) { |
1173 | P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to open fd\n"); | |
1174 | sockfd_put(csocket); | |
1175 | return ret; | |
1176 | } | |
1177 | ||
8b81ef58 | 1178 | ((struct p9_trans_fd *)client->trans)->rd->f_flags |= O_NONBLOCK; |
bd238fb4 LI |
1179 | |
1180 | return 0; | |
1181 | } | |
1182 | ||
bd238fb4 LI |
1183 | /** |
1184 | * p9_fd_read- read from a fd | |
8b81ef58 | 1185 | * @client: client instance |
bd238fb4 LI |
1186 | * @v: buffer to receive data into |
1187 | * @len: size of receive buffer | |
1188 | * | |
1189 | */ | |
ee443996 | 1190 | |
8b81ef58 | 1191 | static int p9_fd_read(struct p9_client *client, void *v, int len) |
bd238fb4 LI |
1192 | { |
1193 | int ret; | |
1194 | struct p9_trans_fd *ts = NULL; | |
1195 | ||
8b81ef58 EVH |
1196 | if (client && client->status != Disconnected) |
1197 | ts = client->trans; | |
bd238fb4 LI |
1198 | |
1199 | if (!ts) | |
1200 | return -EREMOTEIO; | |
1201 | ||
1202 | if (!(ts->rd->f_flags & O_NONBLOCK)) | |
1203 | P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n"); | |
1204 | ||
1205 | ret = kernel_read(ts->rd, ts->rd->f_pos, v, len); | |
1206 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) | |
8b81ef58 | 1207 | client->status = Disconnected; |
bd238fb4 LI |
1208 | return ret; |
1209 | } | |
1210 | ||
1211 | /** | |
1212 | * p9_fd_write - write to a socket | |
8b81ef58 | 1213 | * @client: client instance |
bd238fb4 LI |
1214 | * @v: buffer to send data from |
1215 | * @len: size of send buffer | |
1216 | * | |
1217 | */ | |
ee443996 | 1218 | |
8b81ef58 | 1219 | static int p9_fd_write(struct p9_client *client, void *v, int len) |
bd238fb4 LI |
1220 | { |
1221 | int ret; | |
1222 | mm_segment_t oldfs; | |
1223 | struct p9_trans_fd *ts = NULL; | |
1224 | ||
8b81ef58 EVH |
1225 | if (client && client->status != Disconnected) |
1226 | ts = client->trans; | |
bd238fb4 LI |
1227 | |
1228 | if (!ts) | |
1229 | return -EREMOTEIO; | |
1230 | ||
1231 | if (!(ts->wr->f_flags & O_NONBLOCK)) | |
1232 | P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n"); | |
1233 | ||
1234 | oldfs = get_fs(); | |
1235 | set_fs(get_ds()); | |
1236 | /* The cast to a user pointer is valid due to the set_fs() */ | |
1237 | ret = vfs_write(ts->wr, (void __user *)v, len, &ts->wr->f_pos); | |
1238 | set_fs(oldfs); | |
1239 | ||
1240 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) | |
8b81ef58 | 1241 | client->status = Disconnected; |
bd238fb4 LI |
1242 | return ret; |
1243 | } | |
1244 | ||
1245 | static unsigned int | |
8b81ef58 | 1246 | p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt) |
bd238fb4 LI |
1247 | { |
1248 | int ret, n; | |
1249 | struct p9_trans_fd *ts = NULL; | |
bd238fb4 | 1250 | |
8b81ef58 EVH |
1251 | if (client && client->status == Connected) |
1252 | ts = client->trans; | |
bd238fb4 LI |
1253 | |
1254 | if (!ts) | |
1255 | return -EREMOTEIO; | |
1256 | ||
1257 | if (!ts->rd->f_op || !ts->rd->f_op->poll) | |
1258 | return -EIO; | |
1259 | ||
1260 | if (!ts->wr->f_op || !ts->wr->f_op->poll) | |
1261 | return -EIO; | |
1262 | ||
bd238fb4 LI |
1263 | ret = ts->rd->f_op->poll(ts->rd, pt); |
1264 | if (ret < 0) | |
ec3c68f2 | 1265 | return ret; |
bd238fb4 LI |
1266 | |
1267 | if (ts->rd != ts->wr) { | |
1268 | n = ts->wr->f_op->poll(ts->wr, pt); | |
ec3c68f2 TH |
1269 | if (n < 0) |
1270 | return n; | |
bd238fb4 LI |
1271 | ret = (ret & ~POLLOUT) | (n & ~POLLIN); |
1272 | } | |
1273 | ||
bd238fb4 LI |
1274 | return ret; |
1275 | } | |
1276 | ||
1277 | /** | |
8b81ef58 EVH |
1278 | * p9_fd_close - shutdown file descriptor transport |
1279 | * @client: client instance | |
bd238fb4 LI |
1280 | * |
1281 | */ | |
ee443996 | 1282 | |
8b81ef58 | 1283 | static void p9_fd_close(struct p9_client *client) |
bd238fb4 LI |
1284 | { |
1285 | struct p9_trans_fd *ts; | |
1286 | ||
8b81ef58 | 1287 | if (!client) |
bd238fb4 LI |
1288 | return; |
1289 | ||
8b81ef58 | 1290 | ts = client->trans; |
bd238fb4 LI |
1291 | if (!ts) |
1292 | return; | |
1293 | ||
8b81ef58 EVH |
1294 | client->status = Disconnected; |
1295 | ||
8a0dc95f EVH |
1296 | p9_conn_destroy(ts->conn); |
1297 | ||
bd238fb4 LI |
1298 | if (ts->rd) |
1299 | fput(ts->rd); | |
1300 | if (ts->wr) | |
1301 | fput(ts->wr); | |
8b81ef58 | 1302 | |
bd238fb4 LI |
1303 | kfree(ts); |
1304 | } | |
1305 | ||
887b3ece EVH |
1306 | /* |
1307 | * stolen from NFS - maybe should be made a generic function? | |
1308 | */ | |
1309 | static inline int valid_ipaddr4(const char *buf) | |
1310 | { | |
1311 | int rc, count, in[4]; | |
1312 | ||
1313 | rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]); | |
1314 | if (rc != 4) | |
1315 | return -EINVAL; | |
1316 | for (count = 0; count < 4; count++) { | |
1317 | if (in[count] > 255) | |
1318 | return -EINVAL; | |
1319 | } | |
1320 | return 0; | |
1321 | } | |
1322 | ||
8b81ef58 EVH |
1323 | static int |
1324 | p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args) | |
a80d923e EVH |
1325 | { |
1326 | int err; | |
a80d923e EVH |
1327 | struct socket *csocket; |
1328 | struct sockaddr_in sin_server; | |
1329 | struct p9_fd_opts opts; | |
8b81ef58 | 1330 | struct p9_trans_fd *p = NULL; /* this gets allocated in p9_fd_open */ |
a80d923e | 1331 | |
bb8ffdfc EVH |
1332 | err = parse_opts(args, &opts); |
1333 | if (err < 0) | |
8b81ef58 | 1334 | return err; |
a80d923e | 1335 | |
887b3ece | 1336 | if (valid_ipaddr4(addr) < 0) |
8b81ef58 | 1337 | return -EINVAL; |
887b3ece | 1338 | |
a80d923e | 1339 | csocket = NULL; |
a80d923e EVH |
1340 | |
1341 | sin_server.sin_family = AF_INET; | |
1342 | sin_server.sin_addr.s_addr = in_aton(addr); | |
1343 | sin_server.sin_port = htons(opts.port); | |
1344 | sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket); | |
1345 | ||
1346 | if (!csocket) { | |
1347 | P9_EPRINTK(KERN_ERR, "p9_trans_tcp: problem creating socket\n"); | |
1348 | err = -EIO; | |
1349 | goto error; | |
1350 | } | |
1351 | ||
1352 | err = csocket->ops->connect(csocket, | |
1353 | (struct sockaddr *)&sin_server, | |
1354 | sizeof(struct sockaddr_in), 0); | |
1355 | if (err < 0) { | |
1356 | P9_EPRINTK(KERN_ERR, | |
1357 | "p9_trans_tcp: problem connecting socket to %s\n", | |
1358 | addr); | |
1359 | goto error; | |
1360 | } | |
1361 | ||
8b81ef58 | 1362 | err = p9_socket_open(client, csocket); |
a80d923e EVH |
1363 | if (err < 0) |
1364 | goto error; | |
1365 | ||
8b81ef58 EVH |
1366 | p = (struct p9_trans_fd *) client->trans; |
1367 | p->conn = p9_conn_create(client); | |
8a0dc95f EVH |
1368 | if (IS_ERR(p->conn)) { |
1369 | err = PTR_ERR(p->conn); | |
1370 | p->conn = NULL; | |
1371 | goto error; | |
1372 | } | |
1373 | ||
8b81ef58 | 1374 | return 0; |
a80d923e EVH |
1375 | |
1376 | error: | |
1377 | if (csocket) | |
1378 | sock_release(csocket); | |
1379 | ||
8b81ef58 EVH |
1380 | kfree(p); |
1381 | ||
1382 | return err; | |
a80d923e EVH |
1383 | } |
1384 | ||
8b81ef58 EVH |
1385 | static int |
1386 | p9_fd_create_unix(struct p9_client *client, const char *addr, char *args) | |
a80d923e EVH |
1387 | { |
1388 | int err; | |
1389 | struct socket *csocket; | |
1390 | struct sockaddr_un sun_server; | |
8b81ef58 | 1391 | struct p9_trans_fd *p = NULL; /* this gets allocated in p9_fd_open */ |
a80d923e EVH |
1392 | |
1393 | csocket = NULL; | |
a80d923e EVH |
1394 | |
1395 | if (strlen(addr) > UNIX_PATH_MAX) { | |
1396 | P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n", | |
1397 | addr); | |
1398 | err = -ENAMETOOLONG; | |
1399 | goto error; | |
1400 | } | |
1401 | ||
1402 | sun_server.sun_family = PF_UNIX; | |
1403 | strcpy(sun_server.sun_path, addr); | |
1404 | sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket); | |
1405 | err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server, | |
1406 | sizeof(struct sockaddr_un) - 1, 0); | |
1407 | if (err < 0) { | |
1408 | P9_EPRINTK(KERN_ERR, | |
1409 | "p9_trans_unix: problem connecting socket: %s: %d\n", | |
1410 | addr, err); | |
1411 | goto error; | |
1412 | } | |
1413 | ||
8b81ef58 | 1414 | err = p9_socket_open(client, csocket); |
a80d923e EVH |
1415 | if (err < 0) |
1416 | goto error; | |
1417 | ||
8b81ef58 EVH |
1418 | p = (struct p9_trans_fd *) client->trans; |
1419 | p->conn = p9_conn_create(client); | |
8a0dc95f EVH |
1420 | if (IS_ERR(p->conn)) { |
1421 | err = PTR_ERR(p->conn); | |
1422 | p->conn = NULL; | |
1423 | goto error; | |
1424 | } | |
1425 | ||
8b81ef58 | 1426 | return 0; |
a80d923e EVH |
1427 | |
1428 | error: | |
1429 | if (csocket) | |
1430 | sock_release(csocket); | |
1431 | ||
8b81ef58 EVH |
1432 | kfree(p); |
1433 | return err; | |
a80d923e EVH |
1434 | } |
1435 | ||
8b81ef58 EVH |
1436 | static int |
1437 | p9_fd_create(struct p9_client *client, const char *addr, char *args) | |
a80d923e EVH |
1438 | { |
1439 | int err; | |
a80d923e | 1440 | struct p9_fd_opts opts; |
8b81ef58 | 1441 | struct p9_trans_fd *p = NULL; /* this get allocated in p9_fd_open */ |
a80d923e EVH |
1442 | |
1443 | parse_opts(args, &opts); | |
1444 | ||
1445 | if (opts.rfd == ~0 || opts.wfd == ~0) { | |
1446 | printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n"); | |
8b81ef58 | 1447 | return -ENOPROTOOPT; |
a80d923e EVH |
1448 | } |
1449 | ||
8b81ef58 | 1450 | err = p9_fd_open(client, opts.rfd, opts.wfd); |
a80d923e EVH |
1451 | if (err < 0) |
1452 | goto error; | |
1453 | ||
8b81ef58 EVH |
1454 | p = (struct p9_trans_fd *) client->trans; |
1455 | p->conn = p9_conn_create(client); | |
8a0dc95f EVH |
1456 | if (IS_ERR(p->conn)) { |
1457 | err = PTR_ERR(p->conn); | |
1458 | p->conn = NULL; | |
1459 | goto error; | |
1460 | } | |
1461 | ||
8b81ef58 | 1462 | return 0; |
a80d923e EVH |
1463 | |
1464 | error: | |
8b81ef58 EVH |
1465 | kfree(p); |
1466 | return err; | |
a80d923e EVH |
1467 | } |
1468 | ||
1469 | static struct p9_trans_module p9_tcp_trans = { | |
1470 | .name = "tcp", | |
1471 | .maxsize = MAX_SOCK_BUF, | |
1472 | .def = 1, | |
8b81ef58 EVH |
1473 | .create = p9_fd_create_tcp, |
1474 | .close = p9_fd_close, | |
1475 | .rpc = p9_fd_rpc, | |
72029fe8 | 1476 | .owner = THIS_MODULE, |
a80d923e EVH |
1477 | }; |
1478 | ||
1479 | static struct p9_trans_module p9_unix_trans = { | |
1480 | .name = "unix", | |
1481 | .maxsize = MAX_SOCK_BUF, | |
1482 | .def = 0, | |
8b81ef58 EVH |
1483 | .create = p9_fd_create_unix, |
1484 | .close = p9_fd_close, | |
1485 | .rpc = p9_fd_rpc, | |
72029fe8 | 1486 | .owner = THIS_MODULE, |
a80d923e EVH |
1487 | }; |
1488 | ||
1489 | static struct p9_trans_module p9_fd_trans = { | |
1490 | .name = "fd", | |
1491 | .maxsize = MAX_SOCK_BUF, | |
1492 | .def = 0, | |
8b81ef58 EVH |
1493 | .create = p9_fd_create, |
1494 | .close = p9_fd_close, | |
1495 | .rpc = p9_fd_rpc, | |
72029fe8 | 1496 | .owner = THIS_MODULE, |
a80d923e EVH |
1497 | }; |
1498 | ||
887b3ece | 1499 | int p9_trans_fd_init(void) |
a80d923e | 1500 | { |
206ca50d TH |
1501 | p9_mux_wq = create_workqueue("v9fs"); |
1502 | if (!p9_mux_wq) { | |
1503 | printk(KERN_WARNING "v9fs: mux: creating workqueue failed\n"); | |
1504 | return -ENOMEM; | |
8a0dc95f EVH |
1505 | } |
1506 | ||
992b3f1d TH |
1507 | p9_poll_task = kthread_run(p9_poll_proc, NULL, "v9fs-poll"); |
1508 | if (IS_ERR(p9_poll_task)) { | |
1509 | destroy_workqueue(p9_mux_wq); | |
1510 | printk(KERN_WARNING "v9fs: mux: creating poll task failed\n"); | |
1511 | return PTR_ERR(p9_poll_task); | |
1512 | } | |
1513 | ||
a80d923e EVH |
1514 | v9fs_register_trans(&p9_tcp_trans); |
1515 | v9fs_register_trans(&p9_unix_trans); | |
1516 | v9fs_register_trans(&p9_fd_trans); | |
1517 | ||
3387b804 | 1518 | return 0; |
a80d923e | 1519 | } |
72029fe8 TH |
1520 | |
1521 | void p9_trans_fd_exit(void) | |
1522 | { | |
992b3f1d | 1523 | kthread_stop(p9_poll_task); |
72029fe8 TH |
1524 | v9fs_unregister_trans(&p9_tcp_trans); |
1525 | v9fs_unregister_trans(&p9_unix_trans); | |
1526 | v9fs_unregister_trans(&p9_fd_trans); | |
206ca50d TH |
1527 | |
1528 | destroy_workqueue(p9_mux_wq); | |
72029fe8 | 1529 | } |