1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * 9P Client |
4 | * |
5 | * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com> |
6 | * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net> |
7 | */ |
8 | |
9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
10 | |
11 | #include <linux/module.h> |
12 | #include <linux/errno.h> |
13 | #include <linux/fs.h> |
14 | #include <linux/poll.h> |
15 | #include <linux/idr.h> |
16 | #include <linux/mutex.h> |
17 | #include <linux/slab.h> |
18 | #include <linux/sched/signal.h> |
19 | #include <linux/uaccess.h> |
20 | #include <linux/uio.h> |
21 | #include <net/9p/9p.h> |
22 | #include <linux/parser.h> |
23 | #include <linux/seq_file.h> |
24 | #include <net/9p/client.h> |
25 | #include <net/9p/transport.h> |
26 | #include "protocol.h" |
27 | |
28 | #define CREATE_TRACE_POINTS |
29 | #include <trace/events/9p.h> |
30 | |
31 | /* DEFAULT MSIZE = 32 pages worth of payload + P9_HDRSZ + |
32 | * room for write (16 extra) or read (11 extra) operands. |
33 | */ |
34 | |
35 | #define DEFAULT_MSIZE ((128 * 1024) + P9_IOHDRSZ) |
36 | |
37 | /* Client Option Parsing (code inspired by NFS code) |
38 | * - a little lazy - parse all client options |
39 | */ |
40 | |
41 | enum { |
42 | Opt_msize, |
43 | Opt_trans, |
44 | Opt_legacy, |
45 | Opt_version, |
46 | Opt_err, |
47 | }; |
48 | |
49 | static const match_table_t tokens = { |
50 | {Opt_msize, "msize=%u" }, |
51 | {Opt_legacy, "noextend" }, |
52 | {Opt_trans, "trans=%s" }, |
53 | {Opt_version, "version=%s" }, |
54 | {Opt_err, NULL}, |
55 | }; |
56 | |
57 | inline int p9_is_proto_dotl(struct p9_client *clnt) |
58 | { |
59 | return clnt->proto_version == p9_proto_2000L; |
60 | } |
61 | EXPORT_SYMBOL(p9_is_proto_dotl); |
62 | |
63 | inline int p9_is_proto_dotu(struct p9_client *clnt) |
64 | { |
65 | return clnt->proto_version == p9_proto_2000u; |
66 | } |
67 | EXPORT_SYMBOL(p9_is_proto_dotu); |
68 | |
69 | int p9_show_client_options(struct seq_file *m, struct p9_client *clnt) |
70 | { |
71 | if (clnt->msize != DEFAULT_MSIZE) |
72 | seq_printf(m, fmt: ",msize=%u" , clnt->msize); |
73 | seq_printf(m, fmt: ",trans=%s" , clnt->trans_mod->name); |
74 | |
75 | switch (clnt->proto_version) { |
76 | case p9_proto_legacy: |
77 | seq_puts(m, s: ",noextend" ); |
78 | break; |
79 | case p9_proto_2000u: |
80 | seq_puts(m, s: ",version=9p2000.u" ); |
81 | break; |
82 | case p9_proto_2000L: |
83 | /* Default */ |
84 | break; |
85 | } |
86 | |
87 | if (clnt->trans_mod->show_options) |
88 | return clnt->trans_mod->show_options(m, clnt); |
89 | return 0; |
90 | } |
91 | EXPORT_SYMBOL(p9_show_client_options); |
92 | |
93 | /* Some error codes are taken directly from the server replies, |
94 | * make sure they are valid. |
95 | */ |
96 | static int safe_errno(int err) |
97 | { |
98 | if (err > 0 || err < -MAX_ERRNO) { |
99 | p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n" , err); |
100 | return -EPROTO; |
101 | } |
102 | return err; |
103 | } |
104 | |
105 | /* Interpret mount option for protocol version */ |
106 | static int get_protocol_version(char *s) |
107 | { |
108 | int version = -EINVAL; |
109 | |
110 | if (!strcmp(s, "9p2000" )) { |
111 | version = p9_proto_legacy; |
112 | p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n" ); |
113 | } else if (!strcmp(s, "9p2000.u" )) { |
114 | version = p9_proto_2000u; |
115 | p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n" ); |
116 | } else if (!strcmp(s, "9p2000.L" )) { |
117 | version = p9_proto_2000L; |
118 | p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n" ); |
119 | } else { |
120 | pr_info("Unknown protocol version %s\n" , s); |
121 | } |
122 | |
123 | return version; |
124 | } |
125 | |
126 | /** |
127 | * parse_opts - parse mount options into client structure |
128 | * @opts: options string passed from mount |
129 | * @clnt: existing v9fs client information |
130 | * |
131 | * Return 0 upon success, -ERRNO upon failure |
132 | */ |
133 | |
134 | static int parse_opts(char *opts, struct p9_client *clnt) |
135 | { |
136 | char *options, *tmp_options; |
137 | char *p; |
138 | substring_t args[MAX_OPT_ARGS]; |
139 | int option; |
140 | char *s; |
141 | int ret = 0; |
142 | |
143 | clnt->proto_version = p9_proto_2000L; |
144 | clnt->msize = DEFAULT_MSIZE; |
145 | |
146 | if (!opts) |
147 | return 0; |
148 | |
149 | tmp_options = kstrdup(s: opts, GFP_KERNEL); |
150 | if (!tmp_options) |
151 | return -ENOMEM; |
152 | options = tmp_options; |
153 | |
154 | while ((p = strsep(&options, "," )) != NULL) { |
155 | int token, r; |
156 | |
157 | if (!*p) |
158 | continue; |
159 | token = match_token(p, table: tokens, args); |
160 | switch (token) { |
161 | case Opt_msize: |
162 | r = match_int(&args[0], result: &option); |
163 | if (r < 0) { |
164 | p9_debug(P9_DEBUG_ERROR, |
165 | "integer field, but no integer?\n" ); |
166 | ret = r; |
167 | continue; |
168 | } |
169 | if (option < 4096) { |
170 | p9_debug(P9_DEBUG_ERROR, |
171 | "msize should be at least 4k\n" ); |
172 | ret = -EINVAL; |
173 | continue; |
174 | } |
175 | clnt->msize = option; |
176 | break; |
177 | case Opt_trans: |
178 | s = match_strdup(&args[0]); |
179 | if (!s) { |
180 | ret = -ENOMEM; |
181 | p9_debug(P9_DEBUG_ERROR, |
182 | "problem allocating copy of trans arg\n" ); |
183 | goto free_and_return; |
184 | } |
185 | |
186 | v9fs_put_trans(m: clnt->trans_mod); |
187 | clnt->trans_mod = v9fs_get_trans_by_name(s); |
188 | if (!clnt->trans_mod) { |
189 | pr_info("Could not find request transport: %s\n" , |
190 | s); |
191 | ret = -EINVAL; |
192 | } |
193 | kfree(objp: s); |
194 | break; |
195 | case Opt_legacy: |
196 | clnt->proto_version = p9_proto_legacy; |
197 | break; |
198 | case Opt_version: |
199 | s = match_strdup(&args[0]); |
200 | if (!s) { |
201 | ret = -ENOMEM; |
202 | p9_debug(P9_DEBUG_ERROR, |
203 | "problem allocating copy of version arg\n" ); |
204 | goto free_and_return; |
205 | } |
206 | r = get_protocol_version(s); |
207 | if (r < 0) |
208 | ret = r; |
209 | else |
210 | clnt->proto_version = r; |
211 | kfree(objp: s); |
212 | break; |
213 | default: |
214 | continue; |
215 | } |
216 | } |
217 | |
218 | free_and_return: |
219 | if (ret) |
220 | v9fs_put_trans(m: clnt->trans_mod); |
221 | kfree(objp: tmp_options); |
222 | return ret; |
223 | } |
224 | |
225 | static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc, |
226 | int alloc_msize) |
227 | { |
228 | if (likely(c->fcall_cache) && alloc_msize == c->msize) { |
229 | fc->sdata = kmem_cache_alloc(cachep: c->fcall_cache, GFP_NOFS); |
230 | fc->cache = c->fcall_cache; |
231 | } else { |
232 | fc->sdata = kmalloc(size: alloc_msize, GFP_NOFS); |
233 | fc->cache = NULL; |
234 | } |
235 | if (!fc->sdata) |
236 | return -ENOMEM; |
237 | fc->capacity = alloc_msize; |
238 | return 0; |
239 | } |
240 | |
241 | void p9_fcall_fini(struct p9_fcall *fc) |
242 | { |
243 | /* sdata can be NULL for interrupted requests in trans_rdma, |
244 | * and kmem_cache_free does not do NULL-check for us |
245 | */ |
246 | if (unlikely(!fc->sdata)) |
247 | return; |
248 | |
249 | if (fc->cache) |
250 | kmem_cache_free(s: fc->cache, objp: fc->sdata); |
251 | else |
252 | kfree(objp: fc->sdata); |
253 | } |
254 | EXPORT_SYMBOL(p9_fcall_fini); |
255 | |
256 | static struct kmem_cache *p9_req_cache; |
257 | |
258 | /** |
259 | * p9_tag_alloc - Allocate a new request. |
260 | * @c: Client session. |
261 | * @type: Transaction type. |
262 | * @t_size: Buffer size for holding this request |
263 | * (automatic calculation by format template if 0). |
264 | * @r_size: Buffer size for holding server's reply on this request |
265 | * (automatic calculation by format template if 0). |
266 | * @fmt: Format template for assembling 9p request message |
267 | * (see p9pdu_vwritef). |
268 | * @ap: Variable arguments to be fed to passed format template |
269 | * (see p9pdu_vwritef). |
270 | * |
271 | * Context: Process context. |
272 | * Return: Pointer to new request. |
273 | */ |
274 | static struct p9_req_t * |
275 | p9_tag_alloc(struct p9_client *c, int8_t type, uint t_size, uint r_size, |
276 | const char *fmt, va_list ap) |
277 | { |
278 | struct p9_req_t *req = kmem_cache_alloc(cachep: p9_req_cache, GFP_NOFS); |
279 | int alloc_tsize; |
280 | int alloc_rsize; |
281 | int tag; |
282 | va_list apc; |
283 | |
284 | va_copy(apc, ap); |
285 | alloc_tsize = min_t(size_t, c->msize, |
286 | t_size ?: p9_msg_buf_size(c, type, fmt, apc)); |
287 | va_end(apc); |
288 | |
289 | alloc_rsize = min_t(size_t, c->msize, |
290 | r_size ?: p9_msg_buf_size(c, type + 1, fmt, ap)); |
291 | |
292 | if (!req) |
293 | return ERR_PTR(error: -ENOMEM); |
294 | |
295 | if (p9_fcall_init(c, fc: &req->tc, alloc_msize: alloc_tsize)) |
296 | goto free_req; |
297 | if (p9_fcall_init(c, fc: &req->rc, alloc_msize: alloc_rsize)) |
298 | goto free; |
299 | |
300 | p9pdu_reset(pdu: &req->tc); |
301 | p9pdu_reset(pdu: &req->rc); |
302 | req->t_err = 0; |
303 | req->status = REQ_STATUS_ALLOC; |
304 | /* refcount needs to be set to 0 before inserting into the idr |
305 | * so p9_tag_lookup does not accept a request that is not fully |
306 | * initialized. refcount_set to 2 below will mark request ready. |
307 | */ |
308 | refcount_set(r: &req->refcount, n: 0); |
309 | init_waitqueue_head(&req->wq); |
310 | INIT_LIST_HEAD(list: &req->req_list); |
311 | |
312 | idr_preload(GFP_NOFS); |
313 | spin_lock_irq(lock: &c->lock); |
314 | if (type == P9_TVERSION) |
315 | tag = idr_alloc(&c->reqs, ptr: req, P9_NOTAG, P9_NOTAG + 1, |
316 | GFP_NOWAIT); |
317 | else |
318 | tag = idr_alloc(&c->reqs, ptr: req, start: 0, P9_NOTAG, GFP_NOWAIT); |
319 | req->tc.tag = tag; |
320 | spin_unlock_irq(lock: &c->lock); |
321 | idr_preload_end(); |
322 | if (tag < 0) |
323 | goto free; |
324 | |
325 | /* Init ref to two because in the general case there is one ref |
326 | * that is put asynchronously by a writer thread, one ref |
327 | * temporarily given by p9_tag_lookup and put by p9_client_cb |
328 | * in the recv thread, and one ref put by p9_req_put in the |
329 | * main thread. The only exception is virtio that does not use |
330 | * p9_tag_lookup but does not have a writer thread either |
331 | * (the write happens synchronously in the request/zc_request |
332 | * callback), so p9_client_cb eats the second ref there |
333 | * as the pointer is duplicated directly by virtqueue_add_sgs() |
334 | */ |
335 | refcount_set(r: &req->refcount, n: 2); |
336 | |
337 | return req; |
338 | |
339 | free: |
340 | p9_fcall_fini(&req->tc); |
341 | p9_fcall_fini(&req->rc); |
342 | free_req: |
343 | kmem_cache_free(s: p9_req_cache, objp: req); |
344 | return ERR_PTR(error: -ENOMEM); |
345 | } |
346 | |
347 | /** |
348 | * p9_tag_lookup - Look up a request by tag. |
349 | * @c: Client session. |
350 | * @tag: Transaction ID. |
351 | * |
352 | * Context: Any context. |
353 | * Return: A request, or %NULL if there is no request with that tag. |
354 | */ |
355 | struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) |
356 | { |
357 | struct p9_req_t *req; |
358 | |
359 | rcu_read_lock(); |
360 | again: |
361 | req = idr_find(&c->reqs, id: tag); |
362 | if (req) { |
363 | /* We have to be careful with the req found under rcu_read_lock |
364 | * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the |
365 | * ref again without corrupting other data, then check again |
366 | * that the tag matches once we have the ref |
367 | */ |
368 | if (!p9_req_try_get(r: req)) |
369 | goto again; |
370 | if (req->tc.tag != tag) { |
371 | p9_req_put(c, r: req); |
372 | goto again; |
373 | } |
374 | } |
375 | rcu_read_unlock(); |
376 | |
377 | return req; |
378 | } |
379 | EXPORT_SYMBOL(p9_tag_lookup); |
380 | |
381 | /** |
382 | * p9_tag_remove - Remove a tag. |
383 | * @c: Client session. |
384 | * @r: Request of reference. |
385 | * |
386 | * Context: Any context. |
387 | */ |
388 | static void p9_tag_remove(struct p9_client *c, struct p9_req_t *r) |
389 | { |
390 | unsigned long flags; |
391 | u16 tag = r->tc.tag; |
392 | |
393 | p9_debug(P9_DEBUG_MUX, "freeing clnt %p req %p tag: %d\n" , c, r, tag); |
394 | spin_lock_irqsave(&c->lock, flags); |
395 | idr_remove(&c->reqs, id: tag); |
396 | spin_unlock_irqrestore(lock: &c->lock, flags); |
397 | } |
398 | |
399 | int p9_req_put(struct p9_client *c, struct p9_req_t *r) |
400 | { |
401 | if (refcount_dec_and_test(r: &r->refcount)) { |
402 | p9_tag_remove(c, r); |
403 | |
404 | p9_fcall_fini(&r->tc); |
405 | p9_fcall_fini(&r->rc); |
406 | kmem_cache_free(s: p9_req_cache, objp: r); |
407 | return 1; |
408 | } |
409 | return 0; |
410 | } |
411 | EXPORT_SYMBOL(p9_req_put); |
412 | |
413 | /** |
414 | * p9_tag_cleanup - cleans up tags structure and reclaims resources |
415 | * @c: v9fs client struct |
416 | * |
417 | * This frees resources associated with the tags structure |
418 | * |
419 | */ |
420 | static void p9_tag_cleanup(struct p9_client *c) |
421 | { |
422 | struct p9_req_t *req; |
423 | int id; |
424 | |
425 | rcu_read_lock(); |
426 | idr_for_each_entry(&c->reqs, req, id) { |
427 | pr_info("Tag %d still in use\n" , id); |
428 | if (p9_req_put(c, req) == 0) |
429 | pr_warn("Packet with tag %d has still references" , |
430 | req->tc.tag); |
431 | } |
432 | rcu_read_unlock(); |
433 | } |
434 | |
435 | /** |
436 | * p9_client_cb - call back from transport to client |
437 | * @c: client state |
438 | * @req: request received |
439 | * @status: request status, one of REQ_STATUS_* |
440 | * |
441 | */ |
442 | void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) |
443 | { |
444 | p9_debug(P9_DEBUG_MUX, " tag %d\n" , req->tc.tag); |
445 | |
446 | /* This barrier is needed to make sure any change made to req before |
447 | * the status change is visible to another thread |
448 | */ |
449 | smp_wmb(); |
450 | WRITE_ONCE(req->status, status); |
451 | |
452 | wake_up(&req->wq); |
453 | p9_debug(P9_DEBUG_MUX, "wakeup: %d\n" , req->tc.tag); |
454 | p9_req_put(c, req); |
455 | } |
456 | EXPORT_SYMBOL(p9_client_cb); |
457 | |
458 | /** |
459 | * p9_parse_header - parse header arguments out of a packet |
460 | * @pdu: packet to parse |
461 | * @size: size of packet |
462 | * @type: type of request |
463 | * @tag: tag of packet |
464 | * @rewind: set if we need to rewind offset afterwards |
465 | */ |
466 | |
467 | int |
468 | (struct p9_fcall *pdu, int32_t *size, int8_t *type, |
469 | int16_t *tag, int rewind) |
470 | { |
471 | s8 r_type; |
472 | s16 r_tag; |
473 | s32 r_size; |
474 | int offset = pdu->offset; |
475 | int err; |
476 | |
477 | pdu->offset = 0; |
478 | |
479 | err = p9pdu_readf(pdu, proto_version: 0, fmt: "dbw" , &r_size, &r_type, &r_tag); |
480 | if (err) |
481 | goto rewind_and_exit; |
482 | |
483 | if (type) |
484 | *type = r_type; |
485 | if (tag) |
486 | *tag = r_tag; |
487 | if (size) |
488 | *size = r_size; |
489 | |
490 | if (pdu->size != r_size || r_size < 7) { |
491 | err = -EINVAL; |
492 | goto rewind_and_exit; |
493 | } |
494 | |
495 | pdu->id = r_type; |
496 | pdu->tag = r_tag; |
497 | |
498 | p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n" , |
499 | pdu->size, pdu->id, pdu->tag); |
500 | |
501 | rewind_and_exit: |
502 | if (rewind) |
503 | pdu->offset = offset; |
504 | return err; |
505 | } |
506 | EXPORT_SYMBOL(p9_parse_header); |
507 | |
508 | /** |
509 | * p9_check_errors - check 9p packet for error return and process it |
510 | * @c: current client instance |
511 | * @req: request to parse and check for error conditions |
512 | * |
513 | * returns error code if one is discovered, otherwise returns 0 |
514 | * |
515 | * this will have to be more complicated if we have multiple |
516 | * error packet types |
517 | */ |
518 | |
519 | static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) |
520 | { |
521 | s8 type; |
522 | int err; |
523 | int ecode; |
524 | |
525 | err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); |
526 | if (req->rc.size > req->rc.capacity && !req->rc.zc) { |
527 | pr_err("requested packet size too big: %d does not fit %zu (type=%d)\n" , |
528 | req->rc.size, req->rc.capacity, req->rc.id); |
529 | return -EIO; |
530 | } |
531 | /* dump the response from server |
532 | * This should be after check errors which poplulate pdu_fcall. |
533 | */ |
534 | trace_9p_protocol_dump(clnt: c, pdu: &req->rc); |
535 | if (err) { |
536 | p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n" , err); |
537 | return err; |
538 | } |
539 | if (type != P9_RERROR && type != P9_RLERROR) |
540 | return 0; |
541 | |
542 | if (!p9_is_proto_dotl(c)) { |
543 | char *ename = NULL; |
544 | |
545 | err = p9pdu_readf(pdu: &req->rc, proto_version: c->proto_version, fmt: "s?d" , |
546 | &ename, &ecode); |
547 | if (err) { |
548 | kfree(objp: ename); |
549 | goto out_err; |
550 | } |
551 | |
552 | if (p9_is_proto_dotu(c) && ecode < 512) |
553 | err = -ecode; |
554 | |
555 | if (!err) { |
556 | err = p9_errstr2errno(errstr: ename, strlen(ename)); |
557 | |
558 | p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n" , |
559 | -ecode, ename); |
560 | } |
561 | kfree(objp: ename); |
562 | } else { |
563 | err = p9pdu_readf(pdu: &req->rc, proto_version: c->proto_version, fmt: "d" , &ecode); |
564 | if (err) |
565 | goto out_err; |
566 | err = -ecode; |
567 | |
568 | p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n" , -ecode); |
569 | } |
570 | |
571 | return err; |
572 | |
573 | out_err: |
574 | p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n" , err); |
575 | |
576 | return err; |
577 | } |
578 | |
579 | static struct p9_req_t * |
580 | p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); |
581 | |
582 | /** |
583 | * p9_client_flush - flush (cancel) a request |
584 | * @c: client state |
585 | * @oldreq: request to cancel |
586 | * |
587 | * This sents a flush for a particular request and links |
588 | * the flush request to the original request. The current |
589 | * code only supports a single flush request although the protocol |
590 | * allows for multiple flush requests to be sent for a single request. |
591 | * |
592 | */ |
593 | |
594 | static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) |
595 | { |
596 | struct p9_req_t *req; |
597 | s16 oldtag; |
598 | int err; |
599 | |
600 | err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1); |
601 | if (err) |
602 | return err; |
603 | |
604 | p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n" , oldtag); |
605 | |
606 | req = p9_client_rpc(c, type: P9_TFLUSH, fmt: "w" , oldtag); |
607 | if (IS_ERR(ptr: req)) |
608 | return PTR_ERR(ptr: req); |
609 | |
610 | /* if we haven't received a response for oldreq, |
611 | * remove it from the list |
612 | */ |
613 | if (READ_ONCE(oldreq->status) == REQ_STATUS_SENT) { |
614 | if (c->trans_mod->cancelled) |
615 | c->trans_mod->cancelled(c, oldreq); |
616 | } |
617 | |
618 | p9_req_put(c, req); |
619 | return 0; |
620 | } |
621 | |
622 | static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, |
623 | int8_t type, uint t_size, uint r_size, |
624 | const char *fmt, va_list ap) |
625 | { |
626 | int err; |
627 | struct p9_req_t *req; |
628 | va_list apc; |
629 | |
630 | p9_debug(P9_DEBUG_MUX, "client %p op %d\n" , c, type); |
631 | |
632 | /* we allow for any status other than disconnected */ |
633 | if (c->status == Disconnected) |
634 | return ERR_PTR(error: -EIO); |
635 | |
636 | /* if status is begin_disconnected we allow only clunk request */ |
637 | if (c->status == BeginDisconnect && type != P9_TCLUNK) |
638 | return ERR_PTR(error: -EIO); |
639 | |
640 | va_copy(apc, ap); |
641 | req = p9_tag_alloc(c, type, t_size, r_size, fmt, ap: apc); |
642 | va_end(apc); |
643 | if (IS_ERR(ptr: req)) |
644 | return req; |
645 | |
646 | /* marshall the data */ |
647 | p9pdu_prepare(pdu: &req->tc, tag: req->tc.tag, type); |
648 | err = p9pdu_vwritef(pdu: &req->tc, proto_version: c->proto_version, fmt, ap); |
649 | if (err) |
650 | goto reterr; |
651 | p9pdu_finalize(clnt: c, pdu: &req->tc); |
652 | trace_9p_client_req(clnt: c, type, tag: req->tc.tag); |
653 | return req; |
654 | reterr: |
655 | p9_req_put(c, req); |
656 | /* We have to put also the 2nd reference as it won't be used */ |
657 | p9_req_put(c, req); |
658 | return ERR_PTR(error: err); |
659 | } |
660 | |
661 | /** |
662 | * p9_client_rpc - issue a request and wait for a response |
663 | * @c: client session |
664 | * @type: type of request |
665 | * @fmt: protocol format string (see protocol.c) |
666 | * |
667 | * Returns request structure (which client must free using p9_req_put) |
668 | */ |
669 | |
670 | static struct p9_req_t * |
671 | p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) |
672 | { |
673 | va_list ap; |
674 | int sigpending, err; |
675 | unsigned long flags; |
676 | struct p9_req_t *req; |
677 | /* Passing zero for tsize/rsize to p9_client_prepare_req() tells it to |
678 | * auto determine an appropriate (small) request/response size |
679 | * according to actual message data being sent. Currently RDMA |
680 | * transport is excluded from this response message size optimization, |
681 | * as it would not cope with it, due to its pooled response buffers |
682 | * (using an optimized request size for RDMA as well though). |
683 | */ |
684 | const uint tsize = 0; |
685 | const uint rsize = c->trans_mod->pooled_rbuffers ? c->msize : 0; |
686 | |
687 | va_start(ap, fmt); |
688 | req = p9_client_prepare_req(c, type, t_size: tsize, r_size: rsize, fmt, ap); |
689 | va_end(ap); |
690 | if (IS_ERR(ptr: req)) |
691 | return req; |
692 | |
693 | req->tc.zc = false; |
694 | req->rc.zc = false; |
695 | |
696 | if (signal_pending(current)) { |
697 | sigpending = 1; |
698 | clear_thread_flag(TIF_SIGPENDING); |
699 | } else { |
700 | sigpending = 0; |
701 | } |
702 | |
703 | err = c->trans_mod->request(c, req); |
704 | if (err < 0) { |
705 | /* write won't happen */ |
706 | p9_req_put(c, req); |
707 | if (err != -ERESTARTSYS && err != -EFAULT) |
708 | c->status = Disconnected; |
709 | goto recalc_sigpending; |
710 | } |
711 | again: |
712 | /* Wait for the response */ |
713 | err = wait_event_killable(req->wq, |
714 | READ_ONCE(req->status) >= REQ_STATUS_RCVD); |
715 | |
716 | /* Make sure our req is coherent with regard to updates in other |
717 | * threads - echoes to wmb() in the callback |
718 | */ |
719 | smp_rmb(); |
720 | |
721 | if (err == -ERESTARTSYS && c->status == Connected && |
722 | type == P9_TFLUSH) { |
723 | sigpending = 1; |
724 | clear_thread_flag(TIF_SIGPENDING); |
725 | goto again; |
726 | } |
727 | |
728 | if (READ_ONCE(req->status) == REQ_STATUS_ERROR) { |
729 | p9_debug(P9_DEBUG_ERROR, "req_status error %d\n" , req->t_err); |
730 | err = req->t_err; |
731 | } |
732 | if (err == -ERESTARTSYS && c->status == Connected) { |
733 | p9_debug(P9_DEBUG_MUX, "flushing\n" ); |
734 | sigpending = 1; |
735 | clear_thread_flag(TIF_SIGPENDING); |
736 | |
737 | if (c->trans_mod->cancel(c, req)) |
738 | p9_client_flush(c, oldreq: req); |
739 | |
740 | /* if we received the response anyway, don't signal error */ |
741 | if (READ_ONCE(req->status) == REQ_STATUS_RCVD) |
742 | err = 0; |
743 | } |
744 | recalc_sigpending: |
745 | if (sigpending) { |
746 | spin_lock_irqsave(¤t->sighand->siglock, flags); |
747 | recalc_sigpending(); |
748 | spin_unlock_irqrestore(lock: ¤t->sighand->siglock, flags); |
749 | } |
750 | if (err < 0) |
751 | goto reterr; |
752 | |
753 | err = p9_check_errors(c, req); |
754 | trace_9p_client_res(clnt: c, type, tag: req->rc.tag, err); |
755 | if (!err) |
756 | return req; |
757 | reterr: |
758 | p9_req_put(c, req); |
759 | return ERR_PTR(error: safe_errno(err)); |
760 | } |
761 | |
762 | /** |
763 | * p9_client_zc_rpc - issue a request and wait for a response |
764 | * @c: client session |
765 | * @type: type of request |
766 | * @uidata: destination for zero copy read |
767 | * @uodata: source for zero copy write |
768 | * @inlen: read buffer size |
769 | * @olen: write buffer size |
770 | * @in_hdrlen: reader header size, This is the size of response protocol data |
771 | * @fmt: protocol format string (see protocol.c) |
772 | * |
773 | * Returns request structure (which client must free using p9_req_put) |
774 | */ |
775 | static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, |
776 | struct iov_iter *uidata, |
777 | struct iov_iter *uodata, |
778 | int inlen, int olen, int in_hdrlen, |
779 | const char *fmt, ...) |
780 | { |
781 | va_list ap; |
782 | int sigpending, err; |
783 | unsigned long flags; |
784 | struct p9_req_t *req; |
785 | |
786 | va_start(ap, fmt); |
787 | /* We allocate a inline protocol data of only 4k bytes. |
788 | * The actual content is passed in zero-copy fashion. |
789 | */ |
790 | req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, P9_ZC_HDR_SZ, fmt, ap); |
791 | va_end(ap); |
792 | if (IS_ERR(ptr: req)) |
793 | return req; |
794 | |
795 | req->tc.zc = true; |
796 | req->rc.zc = true; |
797 | |
798 | if (signal_pending(current)) { |
799 | sigpending = 1; |
800 | clear_thread_flag(TIF_SIGPENDING); |
801 | } else { |
802 | sigpending = 0; |
803 | } |
804 | |
805 | err = c->trans_mod->zc_request(c, req, uidata, uodata, |
806 | inlen, olen, in_hdrlen); |
807 | if (err < 0) { |
808 | if (err == -EIO) |
809 | c->status = Disconnected; |
810 | if (err != -ERESTARTSYS) |
811 | goto recalc_sigpending; |
812 | } |
813 | if (READ_ONCE(req->status) == REQ_STATUS_ERROR) { |
814 | p9_debug(P9_DEBUG_ERROR, "req_status error %d\n" , req->t_err); |
815 | err = req->t_err; |
816 | } |
817 | if (err == -ERESTARTSYS && c->status == Connected) { |
818 | p9_debug(P9_DEBUG_MUX, "flushing\n" ); |
819 | sigpending = 1; |
820 | clear_thread_flag(TIF_SIGPENDING); |
821 | |
822 | if (c->trans_mod->cancel(c, req)) |
823 | p9_client_flush(c, oldreq: req); |
824 | |
825 | /* if we received the response anyway, don't signal error */ |
826 | if (READ_ONCE(req->status) == REQ_STATUS_RCVD) |
827 | err = 0; |
828 | } |
829 | recalc_sigpending: |
830 | if (sigpending) { |
831 | spin_lock_irqsave(¤t->sighand->siglock, flags); |
832 | recalc_sigpending(); |
833 | spin_unlock_irqrestore(lock: ¤t->sighand->siglock, flags); |
834 | } |
835 | if (err < 0) |
836 | goto reterr; |
837 | |
838 | err = p9_check_errors(c, req); |
839 | trace_9p_client_res(clnt: c, type, tag: req->rc.tag, err); |
840 | if (!err) |
841 | return req; |
842 | reterr: |
843 | p9_req_put(c, req); |
844 | return ERR_PTR(error: safe_errno(err)); |
845 | } |
846 | |
847 | static struct p9_fid *p9_fid_create(struct p9_client *clnt) |
848 | { |
849 | int ret; |
850 | struct p9_fid *fid; |
851 | |
852 | p9_debug(P9_DEBUG_FID, "clnt %p\n" , clnt); |
853 | fid = kzalloc(size: sizeof(*fid), GFP_KERNEL); |
854 | if (!fid) |
855 | return NULL; |
856 | |
857 | fid->mode = -1; |
858 | fid->uid = current_fsuid(); |
859 | fid->clnt = clnt; |
860 | refcount_set(r: &fid->count, n: 1); |
861 | |
862 | idr_preload(GFP_KERNEL); |
863 | spin_lock_irq(lock: &clnt->lock); |
864 | ret = idr_alloc_u32(&clnt->fids, ptr: fid, id: &fid->fid, P9_NOFID - 1, |
865 | GFP_NOWAIT); |
866 | spin_unlock_irq(lock: &clnt->lock); |
867 | idr_preload_end(); |
868 | if (!ret) { |
869 | trace_9p_fid_ref(fid, type: P9_FID_REF_CREATE); |
870 | return fid; |
871 | } |
872 | |
873 | kfree(objp: fid); |
874 | return NULL; |
875 | } |
876 | |
877 | static void p9_fid_destroy(struct p9_fid *fid) |
878 | { |
879 | struct p9_client *clnt; |
880 | unsigned long flags; |
881 | |
882 | p9_debug(P9_DEBUG_FID, "fid %d\n" , fid->fid); |
883 | trace_9p_fid_ref(fid, type: P9_FID_REF_DESTROY); |
884 | clnt = fid->clnt; |
885 | spin_lock_irqsave(&clnt->lock, flags); |
886 | idr_remove(&clnt->fids, id: fid->fid); |
887 | spin_unlock_irqrestore(lock: &clnt->lock, flags); |
888 | kfree(objp: fid->rdir); |
889 | kfree(objp: fid); |
890 | } |
891 | |
892 | /* We also need to export tracepoint symbols for tracepoint_enabled() */ |
893 | EXPORT_TRACEPOINT_SYMBOL(9p_fid_ref); |
894 | |
895 | void do_trace_9p_fid_get(struct p9_fid *fid) |
896 | { |
897 | trace_9p_fid_ref(fid, type: P9_FID_REF_GET); |
898 | } |
899 | EXPORT_SYMBOL(do_trace_9p_fid_get); |
900 | |
901 | void do_trace_9p_fid_put(struct p9_fid *fid) |
902 | { |
903 | trace_9p_fid_ref(fid, type: P9_FID_REF_PUT); |
904 | } |
905 | EXPORT_SYMBOL(do_trace_9p_fid_put); |
906 | |
907 | static int p9_client_version(struct p9_client *c) |
908 | { |
909 | int err; |
910 | struct p9_req_t *req; |
911 | char *version = NULL; |
912 | int msize; |
913 | |
914 | p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n" , |
915 | c->msize, c->proto_version); |
916 | |
917 | switch (c->proto_version) { |
918 | case p9_proto_2000L: |
919 | req = p9_client_rpc(c, type: P9_TVERSION, fmt: "ds" , |
920 | c->msize, "9P2000.L" ); |
921 | break; |
922 | case p9_proto_2000u: |
923 | req = p9_client_rpc(c, type: P9_TVERSION, fmt: "ds" , |
924 | c->msize, "9P2000.u" ); |
925 | break; |
926 | case p9_proto_legacy: |
927 | req = p9_client_rpc(c, type: P9_TVERSION, fmt: "ds" , |
928 | c->msize, "9P2000" ); |
929 | break; |
930 | default: |
931 | return -EINVAL; |
932 | } |
933 | |
934 | if (IS_ERR(ptr: req)) |
935 | return PTR_ERR(ptr: req); |
936 | |
937 | err = p9pdu_readf(pdu: &req->rc, proto_version: c->proto_version, fmt: "ds" , &msize, &version); |
938 | if (err) { |
939 | p9_debug(P9_DEBUG_9P, "version error %d\n" , err); |
940 | trace_9p_protocol_dump(clnt: c, pdu: &req->rc); |
941 | goto error; |
942 | } |
943 | |
944 | p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n" , msize, version); |
945 | if (!strncmp(version, "9P2000.L" , 8)) { |
946 | c->proto_version = p9_proto_2000L; |
947 | } else if (!strncmp(version, "9P2000.u" , 8)) { |
948 | c->proto_version = p9_proto_2000u; |
949 | } else if (!strncmp(version, "9P2000" , 6)) { |
950 | c->proto_version = p9_proto_legacy; |
951 | } else { |
952 | p9_debug(P9_DEBUG_ERROR, |
953 | "server returned an unknown version: %s\n" , version); |
954 | err = -EREMOTEIO; |
955 | goto error; |
956 | } |
957 | |
958 | if (msize < 4096) { |
959 | p9_debug(P9_DEBUG_ERROR, |
960 | "server returned a msize < 4096: %d\n" , msize); |
961 | err = -EREMOTEIO; |
962 | goto error; |
963 | } |
964 | if (msize < c->msize) |
965 | c->msize = msize; |
966 | |
967 | error: |
968 | kfree(objp: version); |
969 | p9_req_put(c, req); |
970 | |
971 | return err; |
972 | } |
973 | |
974 | struct p9_client *p9_client_create(const char *dev_name, char *options) |
975 | { |
976 | int err; |
977 | struct p9_client *clnt; |
978 | char *client_id; |
979 | |
980 | clnt = kmalloc(size: sizeof(*clnt), GFP_KERNEL); |
981 | if (!clnt) |
982 | return ERR_PTR(error: -ENOMEM); |
983 | |
984 | clnt->trans_mod = NULL; |
985 | clnt->trans = NULL; |
986 | clnt->fcall_cache = NULL; |
987 | |
988 | client_id = utsname()->nodename; |
989 | memcpy(clnt->name, client_id, strlen(client_id) + 1); |
990 | |
991 | spin_lock_init(&clnt->lock); |
992 | idr_init(idr: &clnt->fids); |
993 | idr_init(idr: &clnt->reqs); |
994 | |
995 | err = parse_opts(opts: options, clnt); |
996 | if (err < 0) |
997 | goto free_client; |
998 | |
999 | if (!clnt->trans_mod) |
1000 | clnt->trans_mod = v9fs_get_default_trans(); |
1001 | |
1002 | if (!clnt->trans_mod) { |
1003 | err = -EPROTONOSUPPORT; |
1004 | p9_debug(P9_DEBUG_ERROR, |
1005 | "No transport defined or default transport\n" ); |
1006 | goto free_client; |
1007 | } |
1008 | |
1009 | p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n" , |
1010 | clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); |
1011 | |
1012 | err = clnt->trans_mod->create(clnt, dev_name, options); |
1013 | if (err) |
1014 | goto put_trans; |
1015 | |
1016 | if (clnt->msize > clnt->trans_mod->maxsize) { |
1017 | clnt->msize = clnt->trans_mod->maxsize; |
1018 | pr_info("Limiting 'msize' to %d as this is the maximum " |
1019 | "supported by transport %s\n" , |
1020 | clnt->msize, clnt->trans_mod->name |
1021 | ); |
1022 | } |
1023 | |
1024 | if (clnt->msize < 4096) { |
1025 | p9_debug(P9_DEBUG_ERROR, |
1026 | "Please specify a msize of at least 4k\n" ); |
1027 | err = -EINVAL; |
1028 | goto close_trans; |
1029 | } |
1030 | |
1031 | err = p9_client_version(c: clnt); |
1032 | if (err) |
1033 | goto close_trans; |
1034 | |
1035 | /* P9_HDRSZ + 4 is the smallest packet header we can have that is |
1036 | * followed by data accessed from userspace by read |
1037 | */ |
1038 | clnt->fcall_cache = |
1039 | kmem_cache_create_usercopy(name: "9p-fcall-cache" , size: clnt->msize, |
1040 | align: 0, flags: 0, P9_HDRSZ + 4, |
1041 | usersize: clnt->msize - (P9_HDRSZ + 4), |
1042 | NULL); |
1043 | |
1044 | return clnt; |
1045 | |
1046 | close_trans: |
1047 | clnt->trans_mod->close(clnt); |
1048 | put_trans: |
1049 | v9fs_put_trans(m: clnt->trans_mod); |
1050 | free_client: |
1051 | kfree(objp: clnt); |
1052 | return ERR_PTR(error: err); |
1053 | } |
1054 | EXPORT_SYMBOL(p9_client_create); |
1055 | |
1056 | void p9_client_destroy(struct p9_client *clnt) |
1057 | { |
1058 | struct p9_fid *fid; |
1059 | int id; |
1060 | |
1061 | p9_debug(P9_DEBUG_MUX, "clnt %p\n" , clnt); |
1062 | |
1063 | if (clnt->trans_mod) |
1064 | clnt->trans_mod->close(clnt); |
1065 | |
1066 | v9fs_put_trans(m: clnt->trans_mod); |
1067 | |
1068 | idr_for_each_entry(&clnt->fids, fid, id) { |
1069 | pr_info("Found fid %d not clunked\n" , fid->fid); |
1070 | p9_fid_destroy(fid); |
1071 | } |
1072 | |
1073 | p9_tag_cleanup(c: clnt); |
1074 | |
1075 | kmem_cache_destroy(s: clnt->fcall_cache); |
1076 | kfree(objp: clnt); |
1077 | } |
1078 | EXPORT_SYMBOL(p9_client_destroy); |
1079 | |
1080 | void p9_client_disconnect(struct p9_client *clnt) |
1081 | { |
1082 | p9_debug(P9_DEBUG_9P, "clnt %p\n" , clnt); |
1083 | clnt->status = Disconnected; |
1084 | } |
1085 | EXPORT_SYMBOL(p9_client_disconnect); |
1086 | |
1087 | void p9_client_begin_disconnect(struct p9_client *clnt) |
1088 | { |
1089 | p9_debug(P9_DEBUG_9P, "clnt %p\n" , clnt); |
1090 | clnt->status = BeginDisconnect; |
1091 | } |
1092 | EXPORT_SYMBOL(p9_client_begin_disconnect); |
1093 | |
1094 | struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, |
1095 | const char *uname, kuid_t n_uname, |
1096 | const char *aname) |
1097 | { |
1098 | int err; |
1099 | struct p9_req_t *req; |
1100 | struct p9_fid *fid; |
1101 | struct p9_qid qid; |
1102 | |
1103 | p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n" , |
1104 | afid ? afid->fid : -1, uname, aname); |
1105 | fid = p9_fid_create(clnt); |
1106 | if (!fid) { |
1107 | err = -ENOMEM; |
1108 | goto error; |
1109 | } |
1110 | fid->uid = n_uname; |
1111 | |
1112 | req = p9_client_rpc(c: clnt, type: P9_TATTACH, fmt: "ddss?u" , fid->fid, |
1113 | afid ? afid->fid : P9_NOFID, uname, aname, n_uname); |
1114 | if (IS_ERR(ptr: req)) { |
1115 | err = PTR_ERR(ptr: req); |
1116 | goto error; |
1117 | } |
1118 | |
1119 | err = p9pdu_readf(pdu: &req->rc, proto_version: clnt->proto_version, fmt: "Q" , &qid); |
1120 | if (err) { |
1121 | trace_9p_protocol_dump(clnt, pdu: &req->rc); |
1122 | p9_req_put(clnt, req); |
1123 | goto error; |
1124 | } |
1125 | |
1126 | p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n" , |
1127 | qid.type, qid.path, qid.version); |
1128 | |
1129 | memmove(&fid->qid, &qid, sizeof(struct p9_qid)); |
1130 | |
1131 | p9_req_put(clnt, req); |
1132 | return fid; |
1133 | |
1134 | error: |
1135 | if (fid) |
1136 | p9_fid_destroy(fid); |
1137 | return ERR_PTR(error: err); |
1138 | } |
1139 | EXPORT_SYMBOL(p9_client_attach); |
1140 | |
1141 | struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, |
1142 | const unsigned char * const *wnames, int clone) |
1143 | { |
1144 | int err; |
1145 | struct p9_client *clnt; |
1146 | struct p9_fid *fid; |
1147 | struct p9_qid *wqids; |
1148 | struct p9_req_t *req; |
1149 | u16 nwqids, count; |
1150 | |
1151 | wqids = NULL; |
1152 | clnt = oldfid->clnt; |
1153 | if (clone) { |
1154 | fid = p9_fid_create(clnt); |
1155 | if (!fid) { |
1156 | err = -ENOMEM; |
1157 | goto error; |
1158 | } |
1159 | |
1160 | fid->uid = oldfid->uid; |
1161 | } else { |
1162 | fid = oldfid; |
1163 | } |
1164 | |
1165 | p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n" , |
1166 | oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); |
1167 | req = p9_client_rpc(c: clnt, type: P9_TWALK, fmt: "ddT" , oldfid->fid, fid->fid, |
1168 | nwname, wnames); |
1169 | if (IS_ERR(ptr: req)) { |
1170 | err = PTR_ERR(ptr: req); |
1171 | goto error; |
1172 | } |
1173 | |
1174 | err = p9pdu_readf(pdu: &req->rc, proto_version: clnt->proto_version, fmt: "R" , &nwqids, &wqids); |
1175 | if (err) { |
1176 | trace_9p_protocol_dump(clnt, pdu: &req->rc); |
1177 | p9_req_put(clnt, req); |
1178 | goto clunk_fid; |
1179 | } |
1180 | p9_req_put(clnt, req); |
1181 | |
1182 | p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n" , nwqids); |
1183 | |
1184 | if (nwqids != nwname) { |
1185 | err = -ENOENT; |
1186 | goto clunk_fid; |
1187 | } |
1188 | |
1189 | for (count = 0; count < nwqids; count++) |
1190 | p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n" , |
1191 | count, wqids[count].type, |
1192 | wqids[count].path, |
1193 | wqids[count].version); |
1194 | |
1195 | if (nwname) |
1196 | memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); |
1197 | else |
1198 | memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid)); |
1199 | |
1200 | kfree(objp: wqids); |
1201 | return fid; |
1202 | |
1203 | clunk_fid: |
1204 | kfree(objp: wqids); |
1205 | p9_fid_put(fid); |
1206 | fid = NULL; |
1207 | |
1208 | error: |
1209 | if (fid && fid != oldfid) |
1210 | p9_fid_destroy(fid); |
1211 | |
1212 | return ERR_PTR(error: err); |
1213 | } |
1214 | EXPORT_SYMBOL(p9_client_walk); |
1215 | |
1216 | int p9_client_open(struct p9_fid *fid, int mode) |
1217 | { |
1218 | int err; |
1219 | struct p9_client *clnt; |
1220 | struct p9_req_t *req; |
1221 | struct p9_qid qid; |
1222 | int iounit; |
1223 | |
1224 | clnt = fid->clnt; |
1225 | p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n" , |
1226 | p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN" , fid->fid, mode); |
1227 | |
1228 | if (fid->mode != -1) |
1229 | return -EINVAL; |
1230 | |
1231 | if (p9_is_proto_dotl(clnt)) |
1232 | req = p9_client_rpc(c: clnt, type: P9_TLOPEN, fmt: "dd" , fid->fid, mode & P9L_MODE_MASK); |
1233 | else |
1234 | req = p9_client_rpc(c: clnt, type: P9_TOPEN, fmt: "db" , fid->fid, mode & P9L_MODE_MASK); |
1235 | if (IS_ERR(ptr: req)) { |
1236 | err = PTR_ERR(ptr: req); |
1237 | goto error; |
1238 | } |
1239 | |
1240 | err = p9pdu_readf(pdu: &req->rc, proto_version: clnt->proto_version, fmt: "Qd" , &qid, &iounit); |
1241 | if (err) { |
1242 | trace_9p_protocol_dump(clnt, pdu: &req->rc); |
1243 | goto free_and_error; |
1244 | } |
1245 | |
1246 | p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n" , |
1247 | p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN" , qid.type, |
1248 | qid.path, qid.version, iounit); |
1249 | |
1250 | memmove(&fid->qid, &qid, sizeof(struct p9_qid)); |
1251 | fid->mode = mode; |
1252 | fid->iounit = iounit; |
1253 | |
1254 | free_and_error: |
1255 | p9_req_put(clnt, req); |
1256 | error: |
1257 | return err; |
1258 | } |
1259 | EXPORT_SYMBOL(p9_client_open); |
1260 | |
1261 | int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, |
1262 | u32 mode, kgid_t gid, struct p9_qid *qid) |
1263 | { |
1264 | int err; |
1265 | struct p9_client *clnt; |
1266 | struct p9_req_t *req; |
1267 | int iounit; |
1268 | |
1269 | p9_debug(P9_DEBUG_9P, |
1270 | ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n" , |
1271 | ofid->fid, name, flags, mode, |
1272 | from_kgid(&init_user_ns, gid)); |
1273 | clnt = ofid->clnt; |
1274 | |
1275 | if (ofid->mode != -1) |
1276 | return -EINVAL; |
1277 | |
1278 | req = p9_client_rpc(c: clnt, type: P9_TLCREATE, fmt: "dsddg" , ofid->fid, name, flags, |
1279 | mode & P9L_MODE_MASK, gid); |
1280 | if (IS_ERR(ptr: req)) { |
1281 | err = PTR_ERR(ptr: req); |
1282 | goto error; |
1283 | } |
1284 | |
1285 | err = p9pdu_readf(pdu: &req->rc, proto_version: clnt->proto_version, fmt: "Qd" , qid, &iounit); |
1286 | if (err) { |
1287 | trace_9p_protocol_dump(clnt, pdu: &req->rc); |
1288 | goto free_and_error; |
1289 | } |
1290 | |
1291 | p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n" , |
1292 | qid->type, qid->path, qid->version, iounit); |
1293 | |
1294 | memmove(&ofid->qid, qid, sizeof(struct p9_qid)); |
1295 | ofid->mode = flags; |
1296 | ofid->iounit = iounit; |
1297 | |
1298 | free_and_error: |
1299 | p9_req_put(clnt, req); |
1300 | error: |
1301 | return err; |
1302 | } |
1303 | EXPORT_SYMBOL(p9_client_create_dotl); |
1304 | |
1305 | int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, |
1306 | char *extension) |
1307 | { |
1308 | int err; |
1309 | struct p9_client *clnt; |
1310 | struct p9_req_t *req; |
1311 | struct p9_qid qid; |
1312 | int iounit; |
1313 | |
1314 | p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n" , |
1315 | fid->fid, name, perm, mode); |
1316 | clnt = fid->clnt; |
1317 | |
1318 | if (fid->mode != -1) |
1319 | return -EINVAL; |
1320 | |
1321 | req = p9_client_rpc(c: clnt, type: P9_TCREATE, fmt: "dsdb?s" , fid->fid, name, perm, |
1322 | mode & P9L_MODE_MASK, extension); |
1323 | if (IS_ERR(ptr: req)) { |
1324 | err = PTR_ERR(ptr: req); |
1325 | goto error; |
1326 | } |
1327 | |
1328 | err = p9pdu_readf(pdu: &req->rc, proto_version: clnt->proto_version, fmt: "Qd" , &qid, &iounit); |
1329 | if (err) { |
1330 | trace_9p_protocol_dump(clnt, pdu: &req->rc); |
1331 | goto free_and_error; |
1332 | } |
1333 | |
1334 | p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n" , |
1335 | qid.type, qid.path, qid.version, iounit); |
1336 | |
1337 | memmove(&fid->qid, &qid, sizeof(struct p9_qid)); |
1338 | fid->mode = mode; |
1339 | fid->iounit = iounit; |
1340 | |
1341 | free_and_error: |
1342 | p9_req_put(clnt, req); |
1343 | error: |
1344 | return err; |
1345 | } |
1346 | EXPORT_SYMBOL(p9_client_fcreate); |
1347 | |
1348 | int p9_client_symlink(struct p9_fid *dfid, const char *name, |
1349 | const char *symtgt, kgid_t gid, struct p9_qid *qid) |
1350 | { |
1351 | int err; |
1352 | struct p9_client *clnt; |
1353 | struct p9_req_t *req; |
1354 | |
1355 | p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n" , |
1356 | dfid->fid, name, symtgt); |
1357 | clnt = dfid->clnt; |
1358 | |
1359 | req = p9_client_rpc(c: clnt, type: P9_TSYMLINK, fmt: "dssg" , dfid->fid, name, symtgt, |
1360 | gid); |
1361 | if (IS_ERR(ptr: req)) { |
1362 | err = PTR_ERR(ptr: req); |
1363 | goto error; |
1364 | } |
1365 | |
1366 | err = p9pdu_readf(pdu: &req->rc, proto_version: clnt->proto_version, fmt: "Q" , qid); |
1367 | if (err) { |
1368 | trace_9p_protocol_dump(clnt, pdu: &req->rc); |
1369 | goto free_and_error; |
1370 | } |
1371 | |
1372 | p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n" , |
1373 | qid->type, qid->path, qid->version); |
1374 | |
1375 | free_and_error: |
1376 | p9_req_put(clnt, req); |
1377 | error: |
1378 | return err; |
1379 | } |
1380 | EXPORT_SYMBOL(p9_client_symlink); |
1381 | |
1382 | int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) |
1383 | { |
1384 | struct p9_client *clnt; |
1385 | struct p9_req_t *req; |
1386 | |
1387 | p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n" , |
1388 | dfid->fid, oldfid->fid, newname); |
1389 | clnt = dfid->clnt; |
1390 | req = p9_client_rpc(c: clnt, type: P9_TLINK, fmt: "dds" , dfid->fid, oldfid->fid, |
1391 | newname); |
1392 | if (IS_ERR(ptr: req)) |
1393 | return PTR_ERR(ptr: req); |
1394 | |
1395 | p9_debug(P9_DEBUG_9P, "<<< RLINK\n" ); |
1396 | p9_req_put(clnt, req); |
1397 | return 0; |
1398 | } |
1399 | EXPORT_SYMBOL(p9_client_link); |
1400 | |
1401 | int p9_client_fsync(struct p9_fid *fid, int datasync) |
1402 | { |
1403 | int err = 0; |
1404 | struct p9_client *clnt; |
1405 | struct p9_req_t *req; |
1406 | |
1407 | p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n" , |
1408 | fid->fid, datasync); |
1409 | clnt = fid->clnt; |
1410 | |
1411 | req = p9_client_rpc(c: clnt, type: P9_TFSYNC, fmt: "dd" , fid->fid, datasync); |
1412 | if (IS_ERR(ptr: req)) { |
1413 | err = PTR_ERR(ptr: req); |
1414 | goto error; |
1415 | } |
1416 | |
1417 | p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n" , fid->fid); |
1418 | |
1419 | p9_req_put(clnt, req); |
1420 | |
1421 | error: |
1422 | return err; |
1423 | } |
1424 | EXPORT_SYMBOL(p9_client_fsync); |
1425 | |
1426 | int p9_client_clunk(struct p9_fid *fid) |
1427 | { |
1428 | int err = 0; |
1429 | struct p9_client *clnt; |
1430 | struct p9_req_t *req; |
1431 | int retries = 0; |
1432 | |
1433 | again: |
1434 | p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n" , |
1435 | fid->fid, retries); |
1436 | clnt = fid->clnt; |
1437 | |
1438 | req = p9_client_rpc(c: clnt, type: P9_TCLUNK, fmt: "d" , fid->fid); |
1439 | if (IS_ERR(ptr: req)) { |
1440 | err = PTR_ERR(ptr: req); |
1441 | goto error; |
1442 | } |
1443 | |
1444 | p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n" , fid->fid); |
1445 | |
1446 | p9_req_put(clnt, req); |
1447 | error: |
1448 | /* Fid is not valid even after a failed clunk |
1449 | * If interrupted, retry once then give up and |
1450 | * leak fid until umount. |
1451 | */ |
1452 | if (err == -ERESTARTSYS) { |
1453 | if (retries++ == 0) |
1454 | goto again; |
1455 | } else { |
1456 | p9_fid_destroy(fid); |
1457 | } |
1458 | return err; |
1459 | } |
1460 | EXPORT_SYMBOL(p9_client_clunk); |
1461 | |
1462 | int p9_client_remove(struct p9_fid *fid) |
1463 | { |
1464 | int err = 0; |
1465 | struct p9_client *clnt; |
1466 | struct p9_req_t *req; |
1467 | |
1468 | p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n" , fid->fid); |
1469 | clnt = fid->clnt; |
1470 | |
1471 | req = p9_client_rpc(c: clnt, type: P9_TREMOVE, fmt: "d" , fid->fid); |
1472 | if (IS_ERR(ptr: req)) { |
1473 | err = PTR_ERR(ptr: req); |
1474 | goto error; |
1475 | } |
1476 | |
1477 | p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n" , fid->fid); |
1478 | |
1479 | p9_req_put(clnt, req); |
1480 | error: |
1481 | if (err == -ERESTARTSYS) |
1482 | p9_fid_put(fid); |
1483 | else |
1484 | p9_fid_destroy(fid); |
1485 | return err; |
1486 | } |
1487 | EXPORT_SYMBOL(p9_client_remove); |
1488 | |
1489 | int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) |
1490 | { |
1491 | int err = 0; |
1492 | struct p9_req_t *req; |
1493 | struct p9_client *clnt; |
1494 | |
1495 | p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n" , |
1496 | dfid->fid, name, flags); |
1497 | |
1498 | clnt = dfid->clnt; |
1499 | req = p9_client_rpc(c: clnt, type: P9_TUNLINKAT, fmt: "dsd" , dfid->fid, name, flags); |
1500 | if (IS_ERR(ptr: req)) { |
1501 | err = PTR_ERR(ptr: req); |
1502 | goto error; |
1503 | } |
1504 | p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n" , dfid->fid, name); |
1505 | |
1506 | p9_req_put(clnt, req); |
1507 | error: |
1508 | return err; |
1509 | } |
1510 | EXPORT_SYMBOL(p9_client_unlinkat); |
1511 | |
1512 | int |
1513 | p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) |
1514 | { |
1515 | int total = 0; |
1516 | *err = 0; |
1517 | |
1518 | while (iov_iter_count(i: to)) { |
1519 | int count; |
1520 | |
1521 | count = p9_client_read_once(fid, offset, to, err); |
1522 | if (!count || *err) |
1523 | break; |
1524 | offset += count; |
1525 | total += count; |
1526 | } |
1527 | return total; |
1528 | } |
1529 | EXPORT_SYMBOL(p9_client_read); |
1530 | |
1531 | int |
1532 | p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to, |
1533 | int *err) |
1534 | { |
1535 | struct p9_client *clnt = fid->clnt; |
1536 | struct p9_req_t *req; |
1537 | int count = iov_iter_count(i: to); |
1538 | int rsize, received, non_zc = 0; |
1539 | char *dataptr; |
1540 | |
1541 | *err = 0; |
1542 | p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %zu\n" , |
1543 | fid->fid, offset, iov_iter_count(to)); |
1544 | |
1545 | rsize = fid->iounit; |
1546 | if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) |
1547 | rsize = clnt->msize - P9_IOHDRSZ; |
1548 | |
1549 | if (count < rsize) |
1550 | rsize = count; |
1551 | |
1552 | /* Don't bother zerocopy for small IO (< 1024) */ |
1553 | if (clnt->trans_mod->zc_request && rsize > 1024) { |
1554 | /* response header len is 11 |
1555 | * PDU Header(7) + IO Size (4) |
1556 | */ |
1557 | req = p9_client_zc_rpc(c: clnt, type: P9_TREAD, uidata: to, NULL, inlen: rsize, |
1558 | olen: 0, in_hdrlen: 11, fmt: "dqd" , fid->fid, |
1559 | offset, rsize); |
1560 | } else { |
1561 | non_zc = 1; |
1562 | req = p9_client_rpc(c: clnt, type: P9_TREAD, fmt: "dqd" , fid->fid, offset, |
1563 | rsize); |
1564 | } |
1565 | if (IS_ERR(ptr: req)) { |
1566 | *err = PTR_ERR(ptr: req); |
1567 | if (!non_zc) |
1568 | iov_iter_revert(i: to, bytes: count - iov_iter_count(i: to)); |
1569 | return 0; |
1570 | } |
1571 | |
1572 | *err = p9pdu_readf(pdu: &req->rc, proto_version: clnt->proto_version, |
1573 | fmt: "D" , &received, &dataptr); |
1574 | if (*err) { |
1575 | if (!non_zc) |
1576 | iov_iter_revert(i: to, bytes: count - iov_iter_count(i: to)); |
1577 | trace_9p_protocol_dump(clnt, pdu: &req->rc); |
1578 | p9_req_put(clnt, req); |
1579 | return 0; |
1580 | } |
1581 | if (rsize < received) { |
1582 | pr_err("bogus RREAD count (%d > %d)\n" , received, rsize); |
1583 | received = rsize; |
1584 | } |
1585 | |
1586 | p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n" , count); |
1587 | |
1588 | if (non_zc) { |
1589 | int n = copy_to_iter(addr: dataptr, bytes: received, i: to); |
1590 | |
1591 | if (n != received) { |
1592 | *err = -EFAULT; |
1593 | p9_req_put(clnt, req); |
1594 | return n; |
1595 | } |
1596 | } else { |
1597 | iov_iter_revert(i: to, bytes: count - received - iov_iter_count(i: to)); |
1598 | } |
1599 | p9_req_put(clnt, req); |
1600 | return received; |
1601 | } |
1602 | EXPORT_SYMBOL(p9_client_read_once); |
1603 | |
1604 | int |
1605 | p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) |
1606 | { |
1607 | struct p9_client *clnt = fid->clnt; |
1608 | struct p9_req_t *req; |
1609 | int total = 0; |
1610 | *err = 0; |
1611 | |
1612 | p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n" , |
1613 | fid->fid, offset, iov_iter_count(from)); |
1614 | |
1615 | while (iov_iter_count(i: from)) { |
1616 | int count = iov_iter_count(i: from); |
1617 | int rsize = fid->iounit; |
1618 | int written; |
1619 | |
1620 | if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) |
1621 | rsize = clnt->msize - P9_IOHDRSZ; |
1622 | |
1623 | if (count < rsize) |
1624 | rsize = count; |
1625 | |
1626 | /* Don't bother zerocopy for small IO (< 1024) */ |
1627 | if (clnt->trans_mod->zc_request && rsize > 1024) { |
1628 | req = p9_client_zc_rpc(c: clnt, type: P9_TWRITE, NULL, uodata: from, inlen: 0, |
1629 | olen: rsize, P9_ZC_HDR_SZ, fmt: "dqd" , |
1630 | fid->fid, offset, rsize); |
1631 | } else { |
1632 | req = p9_client_rpc(c: clnt, type: P9_TWRITE, fmt: "dqV" , fid->fid, |
1633 | offset, rsize, from); |
1634 | } |
1635 | if (IS_ERR(ptr: req)) { |
1636 | iov_iter_revert(i: from, bytes: count - iov_iter_count(i: from)); |
1637 | *err = PTR_ERR(ptr: req); |
1638 | break; |
1639 | } |
1640 | |
1641 | *err = p9pdu_readf(pdu: &req->rc, proto_version: clnt->proto_version, fmt: "d" , &written); |
1642 | if (*err) { |
1643 | iov_iter_revert(i: from, bytes: count - iov_iter_count(i: from)); |
1644 | trace_9p_protocol_dump(clnt, pdu: &req->rc); |
1645 | p9_req_put(clnt, req); |
1646 | break; |
1647 | } |
1648 | if (rsize < written) { |
1649 | pr_err("bogus RWRITE count (%d > %d)\n" , written, rsize); |
1650 | written = rsize; |
1651 | } |
1652 | |
1653 | p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n" , count); |
1654 | |
1655 | p9_req_put(clnt, req); |
1656 | iov_iter_revert(i: from, bytes: count - written - iov_iter_count(i: from)); |
1657 | total += written; |
1658 | offset += written; |
1659 | } |
1660 | return total; |
1661 | } |
1662 | EXPORT_SYMBOL(p9_client_write); |
1663 | |
1664 | struct p9_wstat *p9_client_stat(struct p9_fid *fid) |
1665 | { |
1666 | int err; |
1667 | struct p9_client *clnt; |
1668 | struct p9_wstat *ret; |
1669 | struct p9_req_t *req; |
1670 | u16 ignored; |
1671 | |
1672 | p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n" , fid->fid); |
1673 | |
1674 | ret = kmalloc(size: sizeof(*ret), GFP_KERNEL); |
1675 | if (!ret) |
1676 | return ERR_PTR(error: -ENOMEM); |
1677 | |
1678 | clnt = fid->clnt; |
1679 | |
1680 | req = p9_client_rpc(c: clnt, type: P9_TSTAT, fmt: "d" , fid->fid); |
1681 | if (IS_ERR(ptr: req)) { |
1682 | err = PTR_ERR(ptr: req); |
1683 | goto error; |
1684 | } |
1685 | |
1686 | err = p9pdu_readf(pdu: &req->rc, proto_version: clnt->proto_version, fmt: "wS" , &ignored, ret); |
1687 | if (err) { |
1688 | trace_9p_protocol_dump(clnt, pdu: &req->rc); |
1689 | p9_req_put(clnt, req); |
1690 | goto error; |
1691 | } |
1692 | |
1693 | p9_debug(P9_DEBUG_9P, |
1694 | "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" |
1695 | "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" |
1696 | "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" |
1697 | "<<< uid=%d gid=%d n_muid=%d\n" , |
1698 | ret->size, ret->type, ret->dev, ret->qid.type, ret->qid.path, |
1699 | ret->qid.version, ret->mode, |
1700 | ret->atime, ret->mtime, ret->length, |
1701 | ret->name, ret->uid, ret->gid, ret->muid, ret->extension, |
1702 | from_kuid(&init_user_ns, ret->n_uid), |
1703 | from_kgid(&init_user_ns, ret->n_gid), |
1704 | from_kuid(&init_user_ns, ret->n_muid)); |
1705 | |
1706 | p9_req_put(clnt, req); |
1707 | return ret; |
1708 | |
1709 | error: |
1710 | kfree(objp: ret); |
1711 | return ERR_PTR(error: err); |
1712 | } |
1713 | EXPORT_SYMBOL(p9_client_stat); |
1714 | |
1715 | struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, |
1716 | u64 request_mask) |
1717 | { |
1718 | int err; |
1719 | struct p9_client *clnt; |
1720 | struct p9_stat_dotl *ret; |
1721 | struct p9_req_t *req; |
1722 | |
1723 | p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n" , |
1724 | fid->fid, request_mask); |
1725 | |
1726 | ret = kmalloc(size: sizeof(*ret), GFP_KERNEL); |
1727 | if (!ret) |
1728 | return ERR_PTR(error: -ENOMEM); |
1729 | |
1730 | clnt = fid->clnt; |
1731 | |
1732 | req = p9_client_rpc(c: clnt, type: P9_TGETATTR, fmt: "dq" , fid->fid, request_mask); |
1733 | if (IS_ERR(ptr: req)) { |
1734 | err = PTR_ERR(ptr: req); |
1735 | goto error; |
1736 | } |
1737 | |
1738 | err = p9pdu_readf(pdu: &req->rc, proto_version: clnt->proto_version, fmt: "A" , ret); |
1739 | if (err) { |
1740 | trace_9p_protocol_dump(clnt, pdu: &req->rc); |
1741 | p9_req_put(clnt, req); |
1742 | goto error; |
1743 | } |
1744 | |
1745 | p9_debug(P9_DEBUG_9P, "<<< RGETATTR st_result_mask=%lld\n" |
1746 | "<<< qid=%x.%llx.%x\n" |
1747 | "<<< st_mode=%8.8x st_nlink=%llu\n" |
1748 | "<<< st_uid=%d st_gid=%d\n" |
1749 | "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" |
1750 | "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" |
1751 | "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" |
1752 | "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" |
1753 | "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" |
1754 | "<<< st_gen=%lld st_data_version=%lld\n" , |
1755 | ret->st_result_mask, |
1756 | ret->qid.type, ret->qid.path, ret->qid.version, |
1757 | ret->st_mode, ret->st_nlink, |
1758 | from_kuid(&init_user_ns, ret->st_uid), |
1759 | from_kgid(&init_user_ns, ret->st_gid), |
1760 | ret->st_rdev, ret->st_size, ret->st_blksize, ret->st_blocks, |
1761 | ret->st_atime_sec, ret->st_atime_nsec, |
1762 | ret->st_mtime_sec, ret->st_mtime_nsec, |
1763 | ret->st_ctime_sec, ret->st_ctime_nsec, |
1764 | ret->st_btime_sec, ret->st_btime_nsec, |
1765 | ret->st_gen, ret->st_data_version); |
1766 | |
1767 | p9_req_put(clnt, req); |
1768 | return ret; |
1769 | |
1770 | error: |
1771 | kfree(objp: ret); |
1772 | return ERR_PTR(error: err); |
1773 | } |
1774 | EXPORT_SYMBOL(p9_client_getattr_dotl); |
1775 | |
1776 | static int p9_client_statsize(struct p9_wstat *wst, int proto_version) |
1777 | { |
1778 | int ret; |
1779 | |
1780 | /* NOTE: size shouldn't include its own length */ |
1781 | /* size[2] type[2] dev[4] qid[13] */ |
1782 | /* mode[4] atime[4] mtime[4] length[8]*/ |
1783 | /* name[s] uid[s] gid[s] muid[s] */ |
1784 | ret = 2 + 4 + 13 + 4 + 4 + 4 + 8 + 2 + 2 + 2 + 2; |
1785 | |
1786 | if (wst->name) |
1787 | ret += strlen(wst->name); |
1788 | if (wst->uid) |
1789 | ret += strlen(wst->uid); |
1790 | if (wst->gid) |
1791 | ret += strlen(wst->gid); |
1792 | if (wst->muid) |
1793 | ret += strlen(wst->muid); |
1794 | |
1795 | if (proto_version == p9_proto_2000u || |
1796 | proto_version == p9_proto_2000L) { |
1797 | /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ |
1798 | ret += 2 + 4 + 4 + 4; |
1799 | if (wst->extension) |
1800 | ret += strlen(wst->extension); |
1801 | } |
1802 | |
1803 | return ret; |
1804 | } |
1805 | |
1806 | int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) |
1807 | { |
1808 | int err = 0; |
1809 | struct p9_req_t *req; |
1810 | struct p9_client *clnt; |
1811 | |
1812 | clnt = fid->clnt; |
1813 | wst->size = p9_client_statsize(wst, proto_version: clnt->proto_version); |
1814 | p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n" , |
1815 | fid->fid); |
1816 | p9_debug(P9_DEBUG_9P, |
1817 | " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" |
1818 | " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" |
1819 | " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" |
1820 | " uid=%d gid=%d n_muid=%d\n" , |
1821 | wst->size, wst->type, wst->dev, wst->qid.type, |
1822 | wst->qid.path, wst->qid.version, |
1823 | wst->mode, wst->atime, wst->mtime, wst->length, |
1824 | wst->name, wst->uid, wst->gid, wst->muid, wst->extension, |
1825 | from_kuid(&init_user_ns, wst->n_uid), |
1826 | from_kgid(&init_user_ns, wst->n_gid), |
1827 | from_kuid(&init_user_ns, wst->n_muid)); |
1828 | |
1829 | req = p9_client_rpc(c: clnt, type: P9_TWSTAT, fmt: "dwS" , |
1830 | fid->fid, wst->size + 2, wst); |
1831 | if (IS_ERR(ptr: req)) { |
1832 | err = PTR_ERR(ptr: req); |
1833 | goto error; |
1834 | } |
1835 | |
1836 | p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n" , fid->fid); |
1837 | |
1838 | p9_req_put(clnt, req); |
1839 | error: |
1840 | return err; |
1841 | } |
1842 | EXPORT_SYMBOL(p9_client_wstat); |
1843 | |
1844 | int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) |
1845 | { |
1846 | int err = 0; |
1847 | struct p9_req_t *req; |
1848 | struct p9_client *clnt; |
1849 | |
1850 | clnt = fid->clnt; |
1851 | p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n" , fid->fid); |
1852 | p9_debug(P9_DEBUG_9P, " valid=%x mode=%x uid=%d gid=%d size=%lld\n" , |
1853 | p9attr->valid, p9attr->mode, |
1854 | from_kuid(&init_user_ns, p9attr->uid), |
1855 | from_kgid(&init_user_ns, p9attr->gid), |
1856 | p9attr->size); |
1857 | p9_debug(P9_DEBUG_9P, " atime_sec=%lld atime_nsec=%lld\n" , |
1858 | p9attr->atime_sec, p9attr->atime_nsec); |
1859 | p9_debug(P9_DEBUG_9P, " mtime_sec=%lld mtime_nsec=%lld\n" , |
1860 | p9attr->mtime_sec, p9attr->mtime_nsec); |
1861 | |
1862 | req = p9_client_rpc(c: clnt, type: P9_TSETATTR, fmt: "dI" , fid->fid, p9attr); |
1863 | |
1864 | if (IS_ERR(ptr: req)) { |
1865 | err = PTR_ERR(ptr: req); |
1866 | goto error; |
1867 | } |
1868 | p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n" , fid->fid); |
1869 | p9_req_put(clnt, req); |
1870 | error: |
1871 | return err; |
1872 | } |
1873 | EXPORT_SYMBOL(p9_client_setattr); |
1874 | |
1875 | int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) |
1876 | { |
1877 | int err; |
1878 | struct p9_req_t *req; |
1879 | struct p9_client *clnt; |
1880 | |
1881 | clnt = fid->clnt; |
1882 | |
1883 | p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n" , fid->fid); |
1884 | |
1885 | req = p9_client_rpc(c: clnt, type: P9_TSTATFS, fmt: "d" , fid->fid); |
1886 | if (IS_ERR(ptr: req)) { |
1887 | err = PTR_ERR(ptr: req); |
1888 | goto error; |
1889 | } |
1890 | |
1891 | err = p9pdu_readf(pdu: &req->rc, proto_version: clnt->proto_version, fmt: "ddqqqqqqd" , &sb->type, |
1892 | &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, |
1893 | &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); |
1894 | if (err) { |
1895 | trace_9p_protocol_dump(clnt, pdu: &req->rc); |
1896 | p9_req_put(clnt, req); |
1897 | goto error; |
1898 | } |
1899 | |
1900 | p9_debug(P9_DEBUG_9P, |
1901 | "<<< RSTATFS fid %d type 0x%x bsize %u blocks %llu bfree %llu bavail %llu files %llu ffree %llu fsid %llu namelen %u\n" , |
1902 | fid->fid, sb->type, sb->bsize, sb->blocks, sb->bfree, |
1903 | sb->bavail, sb->files, sb->ffree, sb->fsid, sb->namelen); |
1904 | |
1905 | p9_req_put(clnt, req); |
1906 | error: |
1907 | return err; |
1908 | } |
1909 | EXPORT_SYMBOL(p9_client_statfs); |
1910 | |
1911 | int p9_client_rename(struct p9_fid *fid, |
1912 | struct p9_fid *newdirfid, const char *name) |
1913 | { |
1914 | int err = 0; |
1915 | struct p9_req_t *req; |
1916 | struct p9_client *clnt; |
1917 | |
1918 | clnt = fid->clnt; |
1919 | |
1920 | p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n" , |
1921 | fid->fid, newdirfid->fid, name); |
1922 | |
1923 | req = p9_client_rpc(c: clnt, type: P9_TRENAME, fmt: "dds" , fid->fid, |
1924 | newdirfid->fid, name); |
1925 | if (IS_ERR(ptr: req)) { |
1926 | err = PTR_ERR(ptr: req); |
1927 | goto error; |
1928 | } |
1929 | |
1930 | p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n" , fid->fid); |
1931 | |
1932 | p9_req_put(clnt, req); |
1933 | error: |
1934 | return err; |
1935 | } |
1936 | EXPORT_SYMBOL(p9_client_rename); |
1937 | |
1938 | int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, |
1939 | struct p9_fid *newdirfid, const char *new_name) |
1940 | { |
1941 | int err = 0; |
1942 | struct p9_req_t *req; |
1943 | struct p9_client *clnt; |
1944 | |
1945 | clnt = olddirfid->clnt; |
1946 | |
1947 | p9_debug(P9_DEBUG_9P, |
1948 | ">>> TRENAMEAT olddirfid %d old name %s newdirfid %d new name %s\n" , |
1949 | olddirfid->fid, old_name, newdirfid->fid, new_name); |
1950 | |
1951 | req = p9_client_rpc(c: clnt, type: P9_TRENAMEAT, fmt: "dsds" , olddirfid->fid, |
1952 | old_name, newdirfid->fid, new_name); |
1953 | if (IS_ERR(ptr: req)) { |
1954 | err = PTR_ERR(ptr: req); |
1955 | goto error; |
1956 | } |
1957 | |
1958 | p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n" , |
1959 | newdirfid->fid, new_name); |
1960 | |
1961 | p9_req_put(clnt, req); |
1962 | error: |
1963 | return err; |
1964 | } |
1965 | EXPORT_SYMBOL(p9_client_renameat); |
1966 | |
1967 | /* An xattrwalk without @attr_name gives the fid for the lisxattr namespace |
1968 | */ |
1969 | struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, |
1970 | const char *attr_name, u64 *attr_size) |
1971 | { |
1972 | int err; |
1973 | struct p9_req_t *req; |
1974 | struct p9_client *clnt; |
1975 | struct p9_fid *attr_fid; |
1976 | |
1977 | clnt = file_fid->clnt; |
1978 | attr_fid = p9_fid_create(clnt); |
1979 | if (!attr_fid) { |
1980 | err = -ENOMEM; |
1981 | goto error; |
1982 | } |
1983 | p9_debug(P9_DEBUG_9P, |
1984 | ">>> TXATTRWALK file_fid %d, attr_fid %d name '%s'\n" , |
1985 | file_fid->fid, attr_fid->fid, attr_name); |
1986 | |
1987 | req = p9_client_rpc(c: clnt, type: P9_TXATTRWALK, fmt: "dds" , |
1988 | file_fid->fid, attr_fid->fid, attr_name); |
1989 | if (IS_ERR(ptr: req)) { |
1990 | err = PTR_ERR(ptr: req); |
1991 | goto error; |
1992 | } |
1993 | err = p9pdu_readf(pdu: &req->rc, proto_version: clnt->proto_version, fmt: "q" , attr_size); |
1994 | if (err) { |
1995 | trace_9p_protocol_dump(clnt, pdu: &req->rc); |
1996 | p9_req_put(clnt, req); |
1997 | goto clunk_fid; |
1998 | } |
1999 | p9_req_put(clnt, req); |
2000 | p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n" , |
2001 | attr_fid->fid, *attr_size); |
2002 | return attr_fid; |
2003 | clunk_fid: |
2004 | p9_fid_put(fid: attr_fid); |
2005 | attr_fid = NULL; |
2006 | error: |
2007 | if (attr_fid && attr_fid != file_fid) |
2008 | p9_fid_destroy(fid: attr_fid); |
2009 | |
2010 | return ERR_PTR(error: err); |
2011 | } |
2012 | EXPORT_SYMBOL_GPL(p9_client_xattrwalk); |
2013 | |
2014 | int p9_client_xattrcreate(struct p9_fid *fid, const char *name, |
2015 | u64 attr_size, int flags) |
2016 | { |
2017 | int err = 0; |
2018 | struct p9_req_t *req; |
2019 | struct p9_client *clnt; |
2020 | |
2021 | p9_debug(P9_DEBUG_9P, |
2022 | ">>> TXATTRCREATE fid %d name %s size %llu flag %d\n" , |
2023 | fid->fid, name, attr_size, flags); |
2024 | clnt = fid->clnt; |
2025 | req = p9_client_rpc(c: clnt, type: P9_TXATTRCREATE, fmt: "dsqd" , |
2026 | fid->fid, name, attr_size, flags); |
2027 | if (IS_ERR(ptr: req)) { |
2028 | err = PTR_ERR(ptr: req); |
2029 | goto error; |
2030 | } |
2031 | p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n" , fid->fid); |
2032 | p9_req_put(clnt, req); |
2033 | error: |
2034 | return err; |
2035 | } |
2036 | EXPORT_SYMBOL_GPL(p9_client_xattrcreate); |
2037 | |
2038 | int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) |
2039 | { |
2040 | int err, rsize, non_zc = 0; |
2041 | struct p9_client *clnt; |
2042 | struct p9_req_t *req; |
2043 | char *dataptr; |
2044 | struct kvec kv = {.iov_base = data, .iov_len = count}; |
2045 | struct iov_iter to; |
2046 | |
2047 | iov_iter_kvec(i: &to, ITER_DEST, kvec: &kv, nr_segs: 1, count); |
2048 | |
2049 | p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n" , |
2050 | fid->fid, offset, count); |
2051 | |
2052 | clnt = fid->clnt; |
2053 | |
2054 | rsize = fid->iounit; |
2055 | if (!rsize || rsize > clnt->msize - P9_READDIRHDRSZ) |
2056 | rsize = clnt->msize - P9_READDIRHDRSZ; |
2057 | |
2058 | if (count < rsize) |
2059 | rsize = count; |
2060 | |
2061 | /* Don't bother zerocopy for small IO (< 1024) */ |
2062 | if (clnt->trans_mod->zc_request && rsize > 1024) { |
2063 | /* response header len is 11 |
2064 | * PDU Header(7) + IO Size (4) |
2065 | */ |
2066 | req = p9_client_zc_rpc(c: clnt, type: P9_TREADDIR, uidata: &to, NULL, inlen: rsize, olen: 0, |
2067 | in_hdrlen: 11, fmt: "dqd" , fid->fid, offset, rsize); |
2068 | } else { |
2069 | non_zc = 1; |
2070 | req = p9_client_rpc(c: clnt, type: P9_TREADDIR, fmt: "dqd" , fid->fid, |
2071 | offset, rsize); |
2072 | } |
2073 | if (IS_ERR(ptr: req)) { |
2074 | err = PTR_ERR(ptr: req); |
2075 | goto error; |
2076 | } |
2077 | |
2078 | err = p9pdu_readf(pdu: &req->rc, proto_version: clnt->proto_version, fmt: "D" , &count, &dataptr); |
2079 | if (err) { |
2080 | trace_9p_protocol_dump(clnt, pdu: &req->rc); |
2081 | goto free_and_error; |
2082 | } |
2083 | if (rsize < count) { |
2084 | pr_err("bogus RREADDIR count (%d > %d)\n" , count, rsize); |
2085 | count = rsize; |
2086 | } |
2087 | |
2088 | p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n" , count); |
2089 | |
2090 | if (non_zc) |
2091 | memmove(data, dataptr, count); |
2092 | |
2093 | p9_req_put(clnt, req); |
2094 | return count; |
2095 | |
2096 | free_and_error: |
2097 | p9_req_put(clnt, req); |
2098 | error: |
2099 | return err; |
2100 | } |
2101 | EXPORT_SYMBOL(p9_client_readdir); |
2102 | |
2103 | int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, |
2104 | dev_t rdev, kgid_t gid, struct p9_qid *qid) |
2105 | { |
2106 | int err; |
2107 | struct p9_client *clnt; |
2108 | struct p9_req_t *req; |
2109 | |
2110 | clnt = fid->clnt; |
2111 | p9_debug(P9_DEBUG_9P, |
2112 | ">>> TMKNOD fid %d name %s mode %d major %d minor %d\n" , |
2113 | fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); |
2114 | req = p9_client_rpc(c: clnt, type: P9_TMKNOD, fmt: "dsdddg" , fid->fid, name, mode, |
2115 | MAJOR(rdev), MINOR(rdev), gid); |
2116 | if (IS_ERR(ptr: req)) |
2117 | return PTR_ERR(ptr: req); |
2118 | |
2119 | err = p9pdu_readf(pdu: &req->rc, proto_version: clnt->proto_version, fmt: "Q" , qid); |
2120 | if (err) { |
2121 | trace_9p_protocol_dump(clnt, pdu: &req->rc); |
2122 | goto error; |
2123 | } |
2124 | p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n" , |
2125 | qid->type, qid->path, qid->version); |
2126 | |
2127 | error: |
2128 | p9_req_put(clnt, req); |
2129 | return err; |
2130 | } |
2131 | EXPORT_SYMBOL(p9_client_mknod_dotl); |
2132 | |
2133 | int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, |
2134 | kgid_t gid, struct p9_qid *qid) |
2135 | { |
2136 | int err; |
2137 | struct p9_client *clnt; |
2138 | struct p9_req_t *req; |
2139 | |
2140 | clnt = fid->clnt; |
2141 | p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n" , |
2142 | fid->fid, name, mode, from_kgid(&init_user_ns, gid)); |
2143 | req = p9_client_rpc(c: clnt, type: P9_TMKDIR, fmt: "dsdg" , |
2144 | fid->fid, name, mode, gid); |
2145 | if (IS_ERR(ptr: req)) |
2146 | return PTR_ERR(ptr: req); |
2147 | |
2148 | err = p9pdu_readf(pdu: &req->rc, proto_version: clnt->proto_version, fmt: "Q" , qid); |
2149 | if (err) { |
2150 | trace_9p_protocol_dump(clnt, pdu: &req->rc); |
2151 | goto error; |
2152 | } |
2153 | p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n" , qid->type, |
2154 | qid->path, qid->version); |
2155 | |
2156 | error: |
2157 | p9_req_put(clnt, req); |
2158 | return err; |
2159 | } |
2160 | EXPORT_SYMBOL(p9_client_mkdir_dotl); |
2161 | |
2162 | int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) |
2163 | { |
2164 | int err; |
2165 | struct p9_client *clnt; |
2166 | struct p9_req_t *req; |
2167 | |
2168 | clnt = fid->clnt; |
2169 | p9_debug(P9_DEBUG_9P, |
2170 | ">>> TLOCK fid %d type %i flags %d start %lld length %lld proc_id %d client_id %s\n" , |
2171 | fid->fid, flock->type, flock->flags, flock->start, |
2172 | flock->length, flock->proc_id, flock->client_id); |
2173 | |
2174 | req = p9_client_rpc(c: clnt, type: P9_TLOCK, fmt: "dbdqqds" , fid->fid, flock->type, |
2175 | flock->flags, flock->start, flock->length, |
2176 | flock->proc_id, flock->client_id); |
2177 | |
2178 | if (IS_ERR(ptr: req)) |
2179 | return PTR_ERR(ptr: req); |
2180 | |
2181 | err = p9pdu_readf(pdu: &req->rc, proto_version: clnt->proto_version, fmt: "b" , status); |
2182 | if (err) { |
2183 | trace_9p_protocol_dump(clnt, pdu: &req->rc); |
2184 | goto error; |
2185 | } |
2186 | p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n" , *status); |
2187 | error: |
2188 | p9_req_put(clnt, req); |
2189 | return err; |
2190 | } |
2191 | EXPORT_SYMBOL(p9_client_lock_dotl); |
2192 | |
2193 | int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) |
2194 | { |
2195 | int err; |
2196 | struct p9_client *clnt; |
2197 | struct p9_req_t *req; |
2198 | |
2199 | clnt = fid->clnt; |
2200 | p9_debug(P9_DEBUG_9P, |
2201 | ">>> TGETLOCK fid %d, type %i start %lld length %lld proc_id %d client_id %s\n" , |
2202 | fid->fid, glock->type, glock->start, glock->length, |
2203 | glock->proc_id, glock->client_id); |
2204 | |
2205 | req = p9_client_rpc(c: clnt, type: P9_TGETLOCK, fmt: "dbqqds" , fid->fid, |
2206 | glock->type, glock->start, glock->length, |
2207 | glock->proc_id, glock->client_id); |
2208 | |
2209 | if (IS_ERR(ptr: req)) |
2210 | return PTR_ERR(ptr: req); |
2211 | |
2212 | err = p9pdu_readf(pdu: &req->rc, proto_version: clnt->proto_version, fmt: "bqqds" , &glock->type, |
2213 | &glock->start, &glock->length, &glock->proc_id, |
2214 | &glock->client_id); |
2215 | if (err) { |
2216 | trace_9p_protocol_dump(clnt, pdu: &req->rc); |
2217 | goto error; |
2218 | } |
2219 | p9_debug(P9_DEBUG_9P, |
2220 | "<<< RGETLOCK type %i start %lld length %lld proc_id %d client_id %s\n" , |
2221 | glock->type, glock->start, glock->length, |
2222 | glock->proc_id, glock->client_id); |
2223 | error: |
2224 | p9_req_put(clnt, req); |
2225 | return err; |
2226 | } |
2227 | EXPORT_SYMBOL(p9_client_getlock_dotl); |
2228 | |
2229 | int p9_client_readlink(struct p9_fid *fid, char **target) |
2230 | { |
2231 | int err; |
2232 | struct p9_client *clnt; |
2233 | struct p9_req_t *req; |
2234 | |
2235 | clnt = fid->clnt; |
2236 | p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n" , fid->fid); |
2237 | |
2238 | req = p9_client_rpc(c: clnt, type: P9_TREADLINK, fmt: "d" , fid->fid); |
2239 | if (IS_ERR(ptr: req)) |
2240 | return PTR_ERR(ptr: req); |
2241 | |
2242 | err = p9pdu_readf(pdu: &req->rc, proto_version: clnt->proto_version, fmt: "s" , target); |
2243 | if (err) { |
2244 | trace_9p_protocol_dump(clnt, pdu: &req->rc); |
2245 | goto error; |
2246 | } |
2247 | p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n" , *target); |
2248 | error: |
2249 | p9_req_put(clnt, req); |
2250 | return err; |
2251 | } |
2252 | EXPORT_SYMBOL(p9_client_readlink); |
2253 | |
2254 | int __init p9_client_init(void) |
2255 | { |
2256 | p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); |
2257 | return p9_req_cache ? 0 : -ENOMEM; |
2258 | } |
2259 | |
2260 | void __exit p9_client_exit(void) |
2261 | { |
2262 | kmem_cache_destroy(s: p9_req_cache); |
2263 | } |
2264 | |