Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0-only
2 : /*
3 : * net/9p/clnt.c
4 : *
5 : * 9P Client
6 : *
7 : * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
8 : * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
9 : */
10 :
11 : #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12 :
13 : #include <linux/module.h>
14 : #include <linux/errno.h>
15 : #include <linux/fs.h>
16 : #include <linux/poll.h>
17 : #include <linux/idr.h>
18 : #include <linux/mutex.h>
19 : #include <linux/slab.h>
20 : #include <linux/sched/signal.h>
21 : #include <linux/uaccess.h>
22 : #include <linux/uio.h>
23 : #include <net/9p/9p.h>
24 : #include <linux/parser.h>
25 : #include <linux/seq_file.h>
26 : #include <net/9p/client.h>
27 : #include <net/9p/transport.h>
28 : #include "protocol.h"
29 :
30 : #define CREATE_TRACE_POINTS
31 : #include <trace/events/9p.h>
32 :
33 : /*
34 : * Client Option Parsing (code inspired by NFS code)
35 : * - a little lazy - parse all client options
36 : */
37 :
38 : enum {
39 : Opt_msize,
40 : Opt_trans,
41 : Opt_legacy,
42 : Opt_version,
43 : Opt_err,
44 : };
45 :
46 : static const match_table_t tokens = {
47 : {Opt_msize, "msize=%u"},
48 : {Opt_legacy, "noextend"},
49 : {Opt_trans, "trans=%s"},
50 : {Opt_version, "version=%s"},
51 : {Opt_err, NULL},
52 : };
53 :
54 0 : inline int p9_is_proto_dotl(struct p9_client *clnt)
55 : {
56 0 : return clnt->proto_version == p9_proto_2000L;
57 : }
58 : EXPORT_SYMBOL(p9_is_proto_dotl);
59 :
60 0 : inline int p9_is_proto_dotu(struct p9_client *clnt)
61 : {
62 0 : return clnt->proto_version == p9_proto_2000u;
63 : }
64 : EXPORT_SYMBOL(p9_is_proto_dotu);
65 :
66 0 : int p9_show_client_options(struct seq_file *m, struct p9_client *clnt)
67 : {
68 0 : if (clnt->msize != 8192)
69 0 : seq_printf(m, ",msize=%u", clnt->msize);
70 0 : seq_printf(m, ",trans=%s", clnt->trans_mod->name);
71 :
72 0 : switch (clnt->proto_version) {
73 0 : case p9_proto_legacy:
74 0 : seq_puts(m, ",noextend");
75 0 : break;
76 0 : case p9_proto_2000u:
77 0 : seq_puts(m, ",version=9p2000.u");
78 0 : break;
79 : case p9_proto_2000L:
80 : /* Default */
81 : break;
82 : }
83 :
84 0 : if (clnt->trans_mod->show_options)
85 0 : return clnt->trans_mod->show_options(m, clnt);
86 : return 0;
87 : }
88 : EXPORT_SYMBOL(p9_show_client_options);
89 :
90 : /*
91 : * Some error codes are taken directly from the server replies,
92 : * make sure they are valid.
93 : */
94 0 : static int safe_errno(int err)
95 : {
96 0 : if ((err > 0) || (err < -MAX_ERRNO)) {
97 0 : p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err);
98 0 : return -EPROTO;
99 : }
100 : return err;
101 : }
102 :
103 :
104 : /* Interpret mount option for protocol version */
105 0 : static int get_protocol_version(char *s)
106 : {
107 0 : int version = -EINVAL;
108 :
109 0 : if (!strcmp(s, "9p2000")) {
110 : version = p9_proto_legacy;
111 : p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n");
112 0 : } else if (!strcmp(s, "9p2000.u")) {
113 : version = p9_proto_2000u;
114 : p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
115 0 : } else if (!strcmp(s, "9p2000.L")) {
116 : version = p9_proto_2000L;
117 : p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
118 : } else
119 0 : pr_info("Unknown protocol version %s\n", s);
120 :
121 0 : return version;
122 : }
123 :
124 : /**
125 : * parse_options - parse mount options into client structure
126 : * @opts: options string passed from mount
127 : * @clnt: existing v9fs client information
128 : *
129 : * Return 0 upon success, -ERRNO upon failure
130 : */
131 :
132 0 : static int parse_opts(char *opts, struct p9_client *clnt)
133 : {
134 0 : char *options, *tmp_options;
135 0 : char *p;
136 0 : substring_t args[MAX_OPT_ARGS];
137 0 : int option;
138 0 : char *s;
139 0 : int ret = 0;
140 :
141 0 : clnt->proto_version = p9_proto_2000L;
142 0 : clnt->msize = 8192;
143 :
144 0 : if (!opts)
145 : return 0;
146 :
147 0 : tmp_options = kstrdup(opts, GFP_KERNEL);
148 0 : if (!tmp_options) {
149 : p9_debug(P9_DEBUG_ERROR,
150 : "failed to allocate copy of option string\n");
151 : return -ENOMEM;
152 : }
153 0 : options = tmp_options;
154 :
155 0 : while ((p = strsep(&options, ",")) != NULL) {
156 0 : int token, r;
157 0 : if (!*p)
158 0 : continue;
159 0 : token = match_token(p, tokens, args);
160 0 : switch (token) {
161 0 : case Opt_msize:
162 0 : r = match_int(&args[0], &option);
163 0 : if (r < 0) {
164 0 : p9_debug(P9_DEBUG_ERROR,
165 : "integer field, but no integer?\n");
166 0 : ret = r;
167 0 : continue;
168 : }
169 0 : if (option < 4096) {
170 0 : p9_debug(P9_DEBUG_ERROR,
171 : "msize should be at least 4k\n");
172 0 : ret = -EINVAL;
173 0 : continue;
174 : }
175 0 : clnt->msize = option;
176 0 : break;
177 0 : case Opt_trans:
178 0 : s = match_strdup(&args[0]);
179 0 : if (!s) {
180 0 : ret = -ENOMEM;
181 0 : p9_debug(P9_DEBUG_ERROR,
182 : "problem allocating copy of trans arg\n");
183 0 : goto free_and_return;
184 : }
185 :
186 0 : v9fs_put_trans(clnt->trans_mod);
187 0 : clnt->trans_mod = v9fs_get_trans_by_name(s);
188 0 : if (clnt->trans_mod == NULL) {
189 0 : pr_info("Could not find request transport: %s\n",
190 : s);
191 0 : ret = -EINVAL;
192 : }
193 0 : kfree(s);
194 0 : break;
195 0 : case Opt_legacy:
196 0 : clnt->proto_version = p9_proto_legacy;
197 0 : break;
198 0 : case Opt_version:
199 0 : s = match_strdup(&args[0]);
200 0 : if (!s) {
201 0 : ret = -ENOMEM;
202 0 : p9_debug(P9_DEBUG_ERROR,
203 : "problem allocating copy of version arg\n");
204 0 : goto free_and_return;
205 : }
206 0 : r = get_protocol_version(s);
207 0 : if (r < 0)
208 : ret = r;
209 : else
210 0 : clnt->proto_version = r;
211 0 : kfree(s);
212 0 : break;
213 0 : default:
214 0 : continue;
215 : }
216 : }
217 :
218 0 : free_and_return:
219 0 : if (ret)
220 0 : v9fs_put_trans(clnt->trans_mod);
221 0 : kfree(tmp_options);
222 0 : return ret;
223 : }
224 :
225 0 : static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc,
226 : int alloc_msize)
227 : {
228 0 : if (likely(c->fcall_cache) && alloc_msize == c->msize) {
229 0 : fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS);
230 0 : fc->cache = c->fcall_cache;
231 : } else {
232 0 : fc->sdata = kmalloc(alloc_msize, GFP_NOFS);
233 0 : fc->cache = NULL;
234 : }
235 0 : if (!fc->sdata)
236 : return -ENOMEM;
237 0 : fc->capacity = alloc_msize;
238 0 : return 0;
239 : }
240 :
241 0 : 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 0 : if (unlikely(!fc->sdata))
247 : return;
248 :
249 0 : if (fc->cache)
250 0 : kmem_cache_free(fc->cache, fc->sdata);
251 : else
252 0 : kfree(fc->sdata);
253 : }
254 : EXPORT_SYMBOL(p9_fcall_fini);
255 :
256 : static struct kmem_cache *p9_req_cache;
257 :
258 : /**
259 : * p9_req_alloc - Allocate a new request.
260 : * @c: Client session.
261 : * @type: Transaction type.
262 : * @max_size: Maximum packet size for this request.
263 : *
264 : * Context: Process context.
265 : * Return: Pointer to new request.
266 : */
267 : static struct p9_req_t *
268 0 : p9_tag_alloc(struct p9_client *c, int8_t type, unsigned int max_size)
269 : {
270 0 : struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS);
271 0 : int alloc_msize = min(c->msize, max_size);
272 0 : int tag;
273 :
274 0 : if (!req)
275 0 : return ERR_PTR(-ENOMEM);
276 :
277 0 : if (p9_fcall_init(c, &req->tc, alloc_msize))
278 0 : goto free_req;
279 0 : if (p9_fcall_init(c, &req->rc, alloc_msize))
280 0 : goto free;
281 :
282 0 : p9pdu_reset(&req->tc);
283 0 : p9pdu_reset(&req->rc);
284 0 : req->t_err = 0;
285 0 : req->status = REQ_STATUS_ALLOC;
286 0 : init_waitqueue_head(&req->wq);
287 0 : INIT_LIST_HEAD(&req->req_list);
288 :
289 0 : idr_preload(GFP_NOFS);
290 0 : spin_lock_irq(&c->lock);
291 0 : if (type == P9_TVERSION)
292 0 : tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1,
293 : GFP_NOWAIT);
294 : else
295 0 : tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT);
296 0 : req->tc.tag = tag;
297 0 : spin_unlock_irq(&c->lock);
298 0 : idr_preload_end();
299 0 : if (tag < 0)
300 0 : goto free;
301 :
302 : /* Init ref to two because in the general case there is one ref
303 : * that is put asynchronously by a writer thread, one ref
304 : * temporarily given by p9_tag_lookup and put by p9_client_cb
305 : * in the recv thread, and one ref put by p9_tag_remove in the
306 : * main thread. The only exception is virtio that does not use
307 : * p9_tag_lookup but does not have a writer thread either
308 : * (the write happens synchronously in the request/zc_request
309 : * callback), so p9_client_cb eats the second ref there
310 : * as the pointer is duplicated directly by virtqueue_add_sgs()
311 : */
312 0 : refcount_set(&req->refcount.refcount, 2);
313 :
314 0 : return req;
315 :
316 0 : free:
317 0 : p9_fcall_fini(&req->tc);
318 0 : p9_fcall_fini(&req->rc);
319 0 : free_req:
320 0 : kmem_cache_free(p9_req_cache, req);
321 0 : return ERR_PTR(-ENOMEM);
322 : }
323 :
324 : /**
325 : * p9_tag_lookup - Look up a request by tag.
326 : * @c: Client session.
327 : * @tag: Transaction ID.
328 : *
329 : * Context: Any context.
330 : * Return: A request, or %NULL if there is no request with that tag.
331 : */
332 0 : struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
333 : {
334 0 : struct p9_req_t *req;
335 :
336 0 : rcu_read_lock();
337 : again:
338 0 : req = idr_find(&c->reqs, tag);
339 0 : if (req) {
340 : /* We have to be careful with the req found under rcu_read_lock
341 : * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the
342 : * ref again without corrupting other data, then check again
343 : * that the tag matches once we have the ref
344 : */
345 0 : if (!p9_req_try_get(req))
346 0 : goto again;
347 0 : if (req->tc.tag != tag) {
348 0 : p9_req_put(req);
349 0 : goto again;
350 : }
351 : }
352 0 : rcu_read_unlock();
353 :
354 0 : return req;
355 : }
356 : EXPORT_SYMBOL(p9_tag_lookup);
357 :
358 : /**
359 : * p9_tag_remove - Remove a tag.
360 : * @c: Client session.
361 : * @r: Request of reference.
362 : *
363 : * Context: Any context.
364 : */
365 0 : static int p9_tag_remove(struct p9_client *c, struct p9_req_t *r)
366 : {
367 0 : unsigned long flags;
368 0 : u16 tag = r->tc.tag;
369 :
370 0 : p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
371 0 : spin_lock_irqsave(&c->lock, flags);
372 0 : idr_remove(&c->reqs, tag);
373 0 : spin_unlock_irqrestore(&c->lock, flags);
374 0 : return p9_req_put(r);
375 : }
376 :
377 0 : static void p9_req_free(struct kref *ref)
378 : {
379 0 : struct p9_req_t *r = container_of(ref, struct p9_req_t, refcount);
380 0 : p9_fcall_fini(&r->tc);
381 0 : p9_fcall_fini(&r->rc);
382 0 : kmem_cache_free(p9_req_cache, r);
383 0 : }
384 :
385 0 : int p9_req_put(struct p9_req_t *r)
386 : {
387 0 : return kref_put(&r->refcount, p9_req_free);
388 : }
389 : EXPORT_SYMBOL(p9_req_put);
390 :
391 : /**
392 : * p9_tag_cleanup - cleans up tags structure and reclaims resources
393 : * @c: v9fs client struct
394 : *
395 : * This frees resources associated with the tags structure
396 : *
397 : */
398 0 : static void p9_tag_cleanup(struct p9_client *c)
399 : {
400 0 : struct p9_req_t *req;
401 0 : int id;
402 :
403 0 : rcu_read_lock();
404 0 : idr_for_each_entry(&c->reqs, req, id) {
405 0 : pr_info("Tag %d still in use\n", id);
406 0 : if (p9_tag_remove(c, req) == 0)
407 0 : pr_warn("Packet with tag %d has still references",
408 : req->tc.tag);
409 : }
410 0 : rcu_read_unlock();
411 0 : }
412 :
413 : /**
414 : * p9_client_cb - call back from transport to client
415 : * @c: client state
416 : * @req: request received
417 : * @status: request status, one of REQ_STATUS_*
418 : *
419 : */
420 0 : void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
421 : {
422 0 : p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag);
423 :
424 : /*
425 : * This barrier is needed to make sure any change made to req before
426 : * the status change is visible to another thread
427 : */
428 0 : smp_wmb();
429 0 : req->status = status;
430 :
431 0 : wake_up(&req->wq);
432 0 : p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag);
433 0 : p9_req_put(req);
434 0 : }
435 : EXPORT_SYMBOL(p9_client_cb);
436 :
437 : /**
438 : * p9_parse_header - parse header arguments out of a packet
439 : * @pdu: packet to parse
440 : * @size: size of packet
441 : * @type: type of request
442 : * @tag: tag of packet
443 : * @rewind: set if we need to rewind offset afterwards
444 : */
445 :
446 : int
447 0 : p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
448 : int rewind)
449 : {
450 0 : int8_t r_type;
451 0 : int16_t r_tag;
452 0 : int32_t r_size;
453 0 : int offset = pdu->offset;
454 0 : int err;
455 :
456 0 : pdu->offset = 0;
457 :
458 0 : err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
459 0 : if (err)
460 0 : goto rewind_and_exit;
461 :
462 0 : if (type)
463 0 : *type = r_type;
464 0 : if (tag)
465 0 : *tag = r_tag;
466 0 : if (size)
467 0 : *size = r_size;
468 :
469 0 : if (pdu->size != r_size || r_size < 7) {
470 0 : err = -EINVAL;
471 0 : goto rewind_and_exit;
472 : }
473 :
474 0 : pdu->id = r_type;
475 0 : pdu->tag = r_tag;
476 :
477 0 : p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
478 : pdu->size, pdu->id, pdu->tag);
479 :
480 0 : rewind_and_exit:
481 0 : if (rewind)
482 0 : pdu->offset = offset;
483 0 : return err;
484 : }
485 : EXPORT_SYMBOL(p9_parse_header);
486 :
487 : /**
488 : * p9_check_errors - check 9p packet for error return and process it
489 : * @c: current client instance
490 : * @req: request to parse and check for error conditions
491 : *
492 : * returns error code if one is discovered, otherwise returns 0
493 : *
494 : * this will have to be more complicated if we have multiple
495 : * error packet types
496 : */
497 :
498 0 : static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
499 : {
500 0 : int8_t type;
501 0 : int err;
502 0 : int ecode;
503 :
504 0 : err = p9_parse_header(&req->rc, NULL, &type, NULL, 0);
505 0 : if (req->rc.size >= c->msize) {
506 : p9_debug(P9_DEBUG_ERROR,
507 : "requested packet size too big: %d\n",
508 : req->rc.size);
509 : return -EIO;
510 : }
511 : /*
512 : * dump the response from server
513 : * This should be after check errors which poplulate pdu_fcall.
514 : */
515 0 : trace_9p_protocol_dump(c, &req->rc);
516 0 : if (err) {
517 : p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
518 : return err;
519 : }
520 0 : if (type != P9_RERROR && type != P9_RLERROR)
521 : return 0;
522 :
523 0 : if (!p9_is_proto_dotl(c)) {
524 0 : char *ename;
525 0 : err = p9pdu_readf(&req->rc, c->proto_version, "s?d",
526 : &ename, &ecode);
527 0 : if (err)
528 0 : goto out_err;
529 :
530 0 : if (p9_is_proto_dotu(c) && ecode < 512)
531 0 : err = -ecode;
532 :
533 0 : if (!err) {
534 0 : err = p9_errstr2errno(ename, strlen(ename));
535 :
536 0 : p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
537 : -ecode, ename);
538 : }
539 0 : kfree(ename);
540 : } else {
541 0 : err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode);
542 0 : err = -ecode;
543 :
544 0 : p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
545 : }
546 :
547 : return err;
548 :
549 0 : out_err:
550 0 : p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
551 :
552 0 : return err;
553 : }
554 :
555 : /**
556 : * p9_check_zc_errors - check 9p packet for error return and process it
557 : * @c: current client instance
558 : * @req: request to parse and check for error conditions
559 : * @uidata: external buffer containing error
560 : * @in_hdrlen: Size of response protocol buffer.
561 : *
562 : * returns error code if one is discovered, otherwise returns 0
563 : *
564 : * this will have to be more complicated if we have multiple
565 : * error packet types
566 : */
567 :
568 0 : static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
569 : struct iov_iter *uidata, int in_hdrlen)
570 : {
571 0 : int err;
572 0 : int ecode;
573 0 : int8_t type;
574 0 : char *ename = NULL;
575 :
576 0 : err = p9_parse_header(&req->rc, NULL, &type, NULL, 0);
577 : /*
578 : * dump the response from server
579 : * This should be after parse_header which poplulate pdu_fcall.
580 : */
581 0 : trace_9p_protocol_dump(c, &req->rc);
582 0 : if (err) {
583 : p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
584 : return err;
585 : }
586 :
587 0 : if (type != P9_RERROR && type != P9_RLERROR)
588 : return 0;
589 :
590 0 : if (!p9_is_proto_dotl(c)) {
591 : /* Error is reported in string format */
592 0 : int len;
593 : /* 7 = header size for RERROR; */
594 0 : int inline_len = in_hdrlen - 7;
595 :
596 0 : len = req->rc.size - req->rc.offset;
597 0 : if (len > (P9_ZC_HDR_SZ - 7)) {
598 0 : err = -EFAULT;
599 0 : goto out_err;
600 : }
601 :
602 0 : ename = &req->rc.sdata[req->rc.offset];
603 0 : if (len > inline_len) {
604 : /* We have error in external buffer */
605 0 : if (!copy_from_iter_full(ename + inline_len,
606 0 : len - inline_len, uidata)) {
607 0 : err = -EFAULT;
608 0 : goto out_err;
609 : }
610 : }
611 0 : ename = NULL;
612 0 : err = p9pdu_readf(&req->rc, c->proto_version, "s?d",
613 : &ename, &ecode);
614 0 : if (err)
615 0 : goto out_err;
616 :
617 0 : if (p9_is_proto_dotu(c) && ecode < 512)
618 0 : err = -ecode;
619 :
620 0 : if (!err) {
621 0 : err = p9_errstr2errno(ename, strlen(ename));
622 :
623 0 : p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
624 : -ecode, ename);
625 : }
626 0 : kfree(ename);
627 : } else {
628 0 : err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode);
629 0 : err = -ecode;
630 :
631 0 : p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
632 : }
633 : return err;
634 :
635 : out_err:
636 : p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
637 : return err;
638 : }
639 :
640 : static struct p9_req_t *
641 : p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
642 :
643 : /**
644 : * p9_client_flush - flush (cancel) a request
645 : * @c: client state
646 : * @oldreq: request to cancel
647 : *
648 : * This sents a flush for a particular request and links
649 : * the flush request to the original request. The current
650 : * code only supports a single flush request although the protocol
651 : * allows for multiple flush requests to be sent for a single request.
652 : *
653 : */
654 :
655 0 : static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
656 : {
657 0 : struct p9_req_t *req;
658 0 : int16_t oldtag;
659 0 : int err;
660 :
661 0 : err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1);
662 0 : if (err)
663 : return err;
664 :
665 0 : p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
666 :
667 0 : req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
668 0 : if (IS_ERR(req))
669 0 : return PTR_ERR(req);
670 :
671 : /*
672 : * if we haven't received a response for oldreq,
673 : * remove it from the list
674 : */
675 0 : if (oldreq->status == REQ_STATUS_SENT) {
676 0 : if (c->trans_mod->cancelled)
677 0 : c->trans_mod->cancelled(c, oldreq);
678 : }
679 :
680 0 : p9_tag_remove(c, req);
681 0 : return 0;
682 : }
683 :
684 0 : static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
685 : int8_t type, int req_size,
686 : const char *fmt, va_list ap)
687 : {
688 0 : int err;
689 0 : struct p9_req_t *req;
690 :
691 0 : p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
692 :
693 : /* we allow for any status other than disconnected */
694 0 : if (c->status == Disconnected)
695 0 : return ERR_PTR(-EIO);
696 :
697 : /* if status is begin_disconnected we allow only clunk request */
698 0 : if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
699 0 : return ERR_PTR(-EIO);
700 :
701 0 : req = p9_tag_alloc(c, type, req_size);
702 0 : if (IS_ERR(req))
703 : return req;
704 :
705 : /* marshall the data */
706 0 : p9pdu_prepare(&req->tc, req->tc.tag, type);
707 0 : err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap);
708 0 : if (err)
709 0 : goto reterr;
710 0 : p9pdu_finalize(c, &req->tc);
711 0 : trace_9p_client_req(c, type, req->tc.tag);
712 0 : return req;
713 0 : reterr:
714 0 : p9_tag_remove(c, req);
715 : /* We have to put also the 2nd reference as it won't be used */
716 0 : p9_req_put(req);
717 0 : return ERR_PTR(err);
718 : }
719 :
720 : /**
721 : * p9_client_rpc - issue a request and wait for a response
722 : * @c: client session
723 : * @type: type of request
724 : * @fmt: protocol format string (see protocol.c)
725 : *
726 : * Returns request structure (which client must free using p9_tag_remove)
727 : */
728 :
729 : static struct p9_req_t *
730 0 : p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
731 : {
732 0 : va_list ap;
733 0 : int sigpending, err;
734 0 : unsigned long flags;
735 0 : struct p9_req_t *req;
736 :
737 0 : va_start(ap, fmt);
738 0 : req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
739 0 : va_end(ap);
740 0 : if (IS_ERR(req))
741 : return req;
742 :
743 0 : if (signal_pending(current)) {
744 0 : sigpending = 1;
745 0 : clear_thread_flag(TIF_SIGPENDING);
746 : } else
747 : sigpending = 0;
748 :
749 0 : err = c->trans_mod->request(c, req);
750 0 : if (err < 0) {
751 : /* write won't happen */
752 0 : p9_req_put(req);
753 0 : if (err != -ERESTARTSYS && err != -EFAULT)
754 0 : c->status = Disconnected;
755 0 : goto recalc_sigpending;
756 : }
757 0 : again:
758 : /* Wait for the response */
759 0 : err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD);
760 :
761 : /*
762 : * Make sure our req is coherent with regard to updates in other
763 : * threads - echoes to wmb() in the callback
764 : */
765 0 : smp_rmb();
766 :
767 0 : if ((err == -ERESTARTSYS) && (c->status == Connected)
768 0 : && (type == P9_TFLUSH)) {
769 0 : sigpending = 1;
770 0 : clear_thread_flag(TIF_SIGPENDING);
771 0 : goto again;
772 : }
773 :
774 0 : if (req->status == REQ_STATUS_ERROR) {
775 0 : p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
776 0 : err = req->t_err;
777 : }
778 0 : if ((err == -ERESTARTSYS) && (c->status == Connected)) {
779 0 : p9_debug(P9_DEBUG_MUX, "flushing\n");
780 0 : sigpending = 1;
781 0 : clear_thread_flag(TIF_SIGPENDING);
782 :
783 0 : if (c->trans_mod->cancel(c, req))
784 0 : p9_client_flush(c, req);
785 :
786 : /* if we received the response anyway, don't signal error */
787 0 : if (req->status == REQ_STATUS_RCVD)
788 : err = 0;
789 : }
790 0 : recalc_sigpending:
791 0 : if (sigpending) {
792 0 : spin_lock_irqsave(¤t->sighand->siglock, flags);
793 0 : recalc_sigpending();
794 0 : spin_unlock_irqrestore(¤t->sighand->siglock, flags);
795 : }
796 0 : if (err < 0)
797 0 : goto reterr;
798 :
799 0 : err = p9_check_errors(c, req);
800 0 : trace_9p_client_res(c, type, req->rc.tag, err);
801 0 : if (!err)
802 : return req;
803 0 : reterr:
804 0 : p9_tag_remove(c, req);
805 0 : return ERR_PTR(safe_errno(err));
806 : }
807 :
808 : /**
809 : * p9_client_zc_rpc - issue a request and wait for a response
810 : * @c: client session
811 : * @type: type of request
812 : * @uidata: destination for zero copy read
813 : * @uodata: source for zero copy write
814 : * @inlen: read buffer size
815 : * @olen: write buffer size
816 : * @in_hdrlen: reader header size, This is the size of response protocol data
817 : * @fmt: protocol format string (see protocol.c)
818 : *
819 : * Returns request structure (which client must free using p9_tag_remove)
820 : */
821 0 : static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
822 : struct iov_iter *uidata,
823 : struct iov_iter *uodata,
824 : int inlen, int olen, int in_hdrlen,
825 : const char *fmt, ...)
826 : {
827 0 : va_list ap;
828 0 : int sigpending, err;
829 0 : unsigned long flags;
830 0 : struct p9_req_t *req;
831 :
832 0 : va_start(ap, fmt);
833 : /*
834 : * We allocate a inline protocol data of only 4k bytes.
835 : * The actual content is passed in zero-copy fashion.
836 : */
837 0 : req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
838 0 : va_end(ap);
839 0 : if (IS_ERR(req))
840 : return req;
841 :
842 0 : if (signal_pending(current)) {
843 0 : sigpending = 1;
844 0 : clear_thread_flag(TIF_SIGPENDING);
845 : } else
846 : sigpending = 0;
847 :
848 0 : err = c->trans_mod->zc_request(c, req, uidata, uodata,
849 : inlen, olen, in_hdrlen);
850 0 : if (err < 0) {
851 0 : if (err == -EIO)
852 0 : c->status = Disconnected;
853 0 : if (err != -ERESTARTSYS)
854 0 : goto recalc_sigpending;
855 : }
856 0 : if (req->status == REQ_STATUS_ERROR) {
857 0 : p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
858 0 : err = req->t_err;
859 : }
860 0 : if ((err == -ERESTARTSYS) && (c->status == Connected)) {
861 0 : p9_debug(P9_DEBUG_MUX, "flushing\n");
862 0 : sigpending = 1;
863 0 : clear_thread_flag(TIF_SIGPENDING);
864 :
865 0 : if (c->trans_mod->cancel(c, req))
866 0 : p9_client_flush(c, req);
867 :
868 : /* if we received the response anyway, don't signal error */
869 0 : if (req->status == REQ_STATUS_RCVD)
870 : err = 0;
871 : }
872 0 : recalc_sigpending:
873 0 : if (sigpending) {
874 0 : spin_lock_irqsave(¤t->sighand->siglock, flags);
875 0 : recalc_sigpending();
876 0 : spin_unlock_irqrestore(¤t->sighand->siglock, flags);
877 : }
878 0 : if (err < 0)
879 0 : goto reterr;
880 :
881 0 : err = p9_check_zc_errors(c, req, uidata, in_hdrlen);
882 0 : trace_9p_client_res(c, type, req->rc.tag, err);
883 0 : if (!err)
884 : return req;
885 0 : reterr:
886 0 : p9_tag_remove(c, req);
887 0 : return ERR_PTR(safe_errno(err));
888 : }
889 :
890 0 : static struct p9_fid *p9_fid_create(struct p9_client *clnt)
891 : {
892 0 : int ret;
893 0 : struct p9_fid *fid;
894 :
895 0 : p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
896 0 : fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
897 0 : if (!fid)
898 : return NULL;
899 :
900 0 : memset(&fid->qid, 0, sizeof(struct p9_qid));
901 0 : fid->mode = -1;
902 0 : fid->uid = current_fsuid();
903 0 : fid->clnt = clnt;
904 0 : fid->rdir = NULL;
905 0 : fid->fid = 0;
906 0 : refcount_set(&fid->count, 1);
907 :
908 0 : idr_preload(GFP_KERNEL);
909 0 : spin_lock_irq(&clnt->lock);
910 0 : ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1,
911 : GFP_NOWAIT);
912 0 : spin_unlock_irq(&clnt->lock);
913 0 : idr_preload_end();
914 0 : if (!ret)
915 : return fid;
916 :
917 0 : kfree(fid);
918 0 : return NULL;
919 : }
920 :
921 0 : static void p9_fid_destroy(struct p9_fid *fid)
922 : {
923 0 : struct p9_client *clnt;
924 0 : unsigned long flags;
925 :
926 0 : p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
927 0 : clnt = fid->clnt;
928 0 : spin_lock_irqsave(&clnt->lock, flags);
929 0 : idr_remove(&clnt->fids, fid->fid);
930 0 : spin_unlock_irqrestore(&clnt->lock, flags);
931 0 : kfree(fid->rdir);
932 0 : kfree(fid);
933 0 : }
934 :
935 0 : static int p9_client_version(struct p9_client *c)
936 : {
937 0 : int err = 0;
938 0 : struct p9_req_t *req;
939 0 : char *version = NULL;
940 0 : int msize;
941 :
942 0 : p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
943 : c->msize, c->proto_version);
944 :
945 0 : switch (c->proto_version) {
946 0 : case p9_proto_2000L:
947 0 : req = p9_client_rpc(c, P9_TVERSION, "ds",
948 : c->msize, "9P2000.L");
949 0 : break;
950 0 : case p9_proto_2000u:
951 0 : req = p9_client_rpc(c, P9_TVERSION, "ds",
952 : c->msize, "9P2000.u");
953 0 : break;
954 0 : case p9_proto_legacy:
955 0 : req = p9_client_rpc(c, P9_TVERSION, "ds",
956 : c->msize, "9P2000");
957 0 : break;
958 : default:
959 : return -EINVAL;
960 : }
961 :
962 0 : if (IS_ERR(req))
963 0 : return PTR_ERR(req);
964 :
965 0 : err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version);
966 0 : if (err) {
967 0 : p9_debug(P9_DEBUG_9P, "version error %d\n", err);
968 0 : trace_9p_protocol_dump(c, &req->rc);
969 0 : goto error;
970 : }
971 :
972 0 : p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
973 0 : if (!strncmp(version, "9P2000.L", 8))
974 0 : c->proto_version = p9_proto_2000L;
975 0 : else if (!strncmp(version, "9P2000.u", 8))
976 0 : c->proto_version = p9_proto_2000u;
977 0 : else if (!strncmp(version, "9P2000", 6))
978 0 : c->proto_version = p9_proto_legacy;
979 : else {
980 0 : p9_debug(P9_DEBUG_ERROR,
981 : "server returned an unknown version: %s\n", version);
982 0 : err = -EREMOTEIO;
983 0 : goto error;
984 : }
985 :
986 0 : if (msize < 4096) {
987 0 : p9_debug(P9_DEBUG_ERROR,
988 : "server returned a msize < 4096: %d\n", msize);
989 0 : err = -EREMOTEIO;
990 0 : goto error;
991 : }
992 0 : if (msize < c->msize)
993 0 : c->msize = msize;
994 :
995 0 : error:
996 0 : kfree(version);
997 0 : p9_tag_remove(c, req);
998 :
999 0 : return err;
1000 : }
1001 :
1002 0 : struct p9_client *p9_client_create(const char *dev_name, char *options)
1003 : {
1004 0 : int err;
1005 0 : struct p9_client *clnt;
1006 0 : char *client_id;
1007 :
1008 0 : err = 0;
1009 0 : clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
1010 0 : if (!clnt)
1011 0 : return ERR_PTR(-ENOMEM);
1012 :
1013 0 : clnt->trans_mod = NULL;
1014 0 : clnt->trans = NULL;
1015 0 : clnt->fcall_cache = NULL;
1016 :
1017 0 : client_id = utsname()->nodename;
1018 0 : memcpy(clnt->name, client_id, strlen(client_id) + 1);
1019 :
1020 0 : spin_lock_init(&clnt->lock);
1021 0 : idr_init(&clnt->fids);
1022 0 : idr_init(&clnt->reqs);
1023 :
1024 0 : err = parse_opts(options, clnt);
1025 0 : if (err < 0)
1026 0 : goto free_client;
1027 :
1028 0 : if (!clnt->trans_mod)
1029 0 : clnt->trans_mod = v9fs_get_default_trans();
1030 :
1031 0 : if (clnt->trans_mod == NULL) {
1032 0 : err = -EPROTONOSUPPORT;
1033 0 : p9_debug(P9_DEBUG_ERROR,
1034 : "No transport defined or default transport\n");
1035 0 : goto free_client;
1036 : }
1037 :
1038 0 : p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1039 : clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1040 :
1041 0 : err = clnt->trans_mod->create(clnt, dev_name, options);
1042 0 : if (err)
1043 0 : goto put_trans;
1044 :
1045 0 : if (clnt->msize > clnt->trans_mod->maxsize)
1046 0 : clnt->msize = clnt->trans_mod->maxsize;
1047 :
1048 0 : if (clnt->msize < 4096) {
1049 0 : p9_debug(P9_DEBUG_ERROR,
1050 : "Please specify a msize of at least 4k\n");
1051 0 : err = -EINVAL;
1052 0 : goto close_trans;
1053 : }
1054 :
1055 0 : err = p9_client_version(clnt);
1056 0 : if (err)
1057 0 : goto close_trans;
1058 :
1059 : /* P9_HDRSZ + 4 is the smallest packet header we can have that is
1060 : * followed by data accessed from userspace by read
1061 : */
1062 0 : clnt->fcall_cache =
1063 0 : kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize,
1064 : 0, 0, P9_HDRSZ + 4,
1065 0 : clnt->msize - (P9_HDRSZ + 4),
1066 : NULL);
1067 :
1068 0 : return clnt;
1069 :
1070 0 : close_trans:
1071 0 : clnt->trans_mod->close(clnt);
1072 0 : put_trans:
1073 0 : v9fs_put_trans(clnt->trans_mod);
1074 0 : free_client:
1075 0 : kfree(clnt);
1076 0 : return ERR_PTR(err);
1077 : }
1078 : EXPORT_SYMBOL(p9_client_create);
1079 :
1080 0 : void p9_client_destroy(struct p9_client *clnt)
1081 : {
1082 0 : struct p9_fid *fid;
1083 0 : int id;
1084 :
1085 0 : p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1086 :
1087 0 : if (clnt->trans_mod)
1088 0 : clnt->trans_mod->close(clnt);
1089 :
1090 0 : v9fs_put_trans(clnt->trans_mod);
1091 :
1092 0 : idr_for_each_entry(&clnt->fids, fid, id) {
1093 0 : pr_info("Found fid %d not clunked\n", fid->fid);
1094 0 : p9_fid_destroy(fid);
1095 : }
1096 :
1097 0 : p9_tag_cleanup(clnt);
1098 :
1099 0 : kmem_cache_destroy(clnt->fcall_cache);
1100 0 : kfree(clnt);
1101 0 : }
1102 : EXPORT_SYMBOL(p9_client_destroy);
1103 :
1104 0 : void p9_client_disconnect(struct p9_client *clnt)
1105 : {
1106 0 : p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1107 0 : clnt->status = Disconnected;
1108 0 : }
1109 : EXPORT_SYMBOL(p9_client_disconnect);
1110 :
1111 0 : void p9_client_begin_disconnect(struct p9_client *clnt)
1112 : {
1113 0 : p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1114 0 : clnt->status = BeginDisconnect;
1115 0 : }
1116 : EXPORT_SYMBOL(p9_client_begin_disconnect);
1117 :
1118 0 : struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1119 : const char *uname, kuid_t n_uname, const char *aname)
1120 : {
1121 0 : int err = 0;
1122 0 : struct p9_req_t *req;
1123 0 : struct p9_fid *fid;
1124 0 : struct p9_qid qid;
1125 :
1126 :
1127 0 : p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1128 : afid ? afid->fid : -1, uname, aname);
1129 0 : fid = p9_fid_create(clnt);
1130 0 : if (!fid) {
1131 0 : err = -ENOMEM;
1132 0 : goto error;
1133 : }
1134 0 : fid->uid = n_uname;
1135 :
1136 0 : req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1137 : afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1138 0 : if (IS_ERR(req)) {
1139 0 : err = PTR_ERR(req);
1140 0 : goto error;
1141 : }
1142 :
1143 0 : err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid);
1144 0 : if (err) {
1145 0 : trace_9p_protocol_dump(clnt, &req->rc);
1146 0 : p9_tag_remove(clnt, req);
1147 0 : goto error;
1148 : }
1149 :
1150 0 : p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1151 : qid.type, (unsigned long long)qid.path, qid.version);
1152 :
1153 0 : memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1154 :
1155 0 : p9_tag_remove(clnt, req);
1156 0 : return fid;
1157 :
1158 0 : error:
1159 0 : if (fid)
1160 0 : p9_fid_destroy(fid);
1161 0 : return ERR_PTR(err);
1162 : }
1163 : EXPORT_SYMBOL(p9_client_attach);
1164 :
1165 0 : struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1166 : const unsigned char * const *wnames, int clone)
1167 : {
1168 0 : int err;
1169 0 : struct p9_client *clnt;
1170 0 : struct p9_fid *fid;
1171 0 : struct p9_qid *wqids;
1172 0 : struct p9_req_t *req;
1173 0 : uint16_t nwqids, count;
1174 :
1175 0 : err = 0;
1176 0 : wqids = NULL;
1177 0 : clnt = oldfid->clnt;
1178 0 : if (clone) {
1179 0 : fid = p9_fid_create(clnt);
1180 0 : if (!fid) {
1181 0 : err = -ENOMEM;
1182 0 : goto error;
1183 : }
1184 :
1185 0 : fid->uid = oldfid->uid;
1186 : } else
1187 : fid = oldfid;
1188 :
1189 :
1190 0 : p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1191 : oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1192 0 : req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1193 : nwname, wnames);
1194 0 : if (IS_ERR(req)) {
1195 0 : err = PTR_ERR(req);
1196 0 : goto error;
1197 : }
1198 :
1199 0 : err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1200 0 : if (err) {
1201 0 : trace_9p_protocol_dump(clnt, &req->rc);
1202 0 : p9_tag_remove(clnt, req);
1203 0 : goto clunk_fid;
1204 : }
1205 0 : p9_tag_remove(clnt, req);
1206 :
1207 0 : p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1208 :
1209 0 : if (nwqids != nwname) {
1210 0 : err = -ENOENT;
1211 0 : goto clunk_fid;
1212 : }
1213 :
1214 0 : for (count = 0; count < nwqids; count++)
1215 : p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1216 : count, wqids[count].type,
1217 : (unsigned long long)wqids[count].path,
1218 : wqids[count].version);
1219 :
1220 0 : if (nwname)
1221 0 : memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1222 : else
1223 0 : memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid));
1224 :
1225 0 : kfree(wqids);
1226 0 : return fid;
1227 :
1228 0 : clunk_fid:
1229 0 : kfree(wqids);
1230 0 : p9_client_clunk(fid);
1231 0 : fid = NULL;
1232 :
1233 0 : error:
1234 0 : if (fid && (fid != oldfid))
1235 0 : p9_fid_destroy(fid);
1236 :
1237 0 : return ERR_PTR(err);
1238 : }
1239 : EXPORT_SYMBOL(p9_client_walk);
1240 :
1241 0 : int p9_client_open(struct p9_fid *fid, int mode)
1242 : {
1243 0 : int err;
1244 0 : struct p9_client *clnt;
1245 0 : struct p9_req_t *req;
1246 0 : struct p9_qid qid;
1247 0 : int iounit;
1248 :
1249 0 : clnt = fid->clnt;
1250 0 : p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1251 : p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1252 0 : err = 0;
1253 :
1254 0 : if (fid->mode != -1)
1255 : return -EINVAL;
1256 :
1257 0 : if (p9_is_proto_dotl(clnt))
1258 0 : req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1259 : else
1260 0 : req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1261 0 : if (IS_ERR(req)) {
1262 0 : err = PTR_ERR(req);
1263 0 : goto error;
1264 : }
1265 :
1266 0 : err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1267 0 : if (err) {
1268 0 : trace_9p_protocol_dump(clnt, &req->rc);
1269 0 : goto free_and_error;
1270 : }
1271 :
1272 0 : p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1273 : p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1274 : (unsigned long long)qid.path, qid.version, iounit);
1275 :
1276 0 : memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1277 0 : fid->mode = mode;
1278 0 : fid->iounit = iounit;
1279 :
1280 0 : free_and_error:
1281 0 : p9_tag_remove(clnt, req);
1282 : error:
1283 : return err;
1284 : }
1285 : EXPORT_SYMBOL(p9_client_open);
1286 :
1287 0 : int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode,
1288 : kgid_t gid, struct p9_qid *qid)
1289 : {
1290 0 : int err = 0;
1291 0 : struct p9_client *clnt;
1292 0 : struct p9_req_t *req;
1293 0 : int iounit;
1294 :
1295 0 : p9_debug(P9_DEBUG_9P,
1296 : ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1297 : ofid->fid, name, flags, mode,
1298 : from_kgid(&init_user_ns, gid));
1299 0 : clnt = ofid->clnt;
1300 :
1301 0 : if (ofid->mode != -1)
1302 : return -EINVAL;
1303 :
1304 0 : req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1305 : mode, gid);
1306 0 : if (IS_ERR(req)) {
1307 0 : err = PTR_ERR(req);
1308 0 : goto error;
1309 : }
1310 :
1311 0 : err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit);
1312 0 : if (err) {
1313 0 : trace_9p_protocol_dump(clnt, &req->rc);
1314 0 : goto free_and_error;
1315 : }
1316 :
1317 0 : p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1318 : qid->type,
1319 : (unsigned long long)qid->path,
1320 : qid->version, iounit);
1321 :
1322 0 : memmove(&ofid->qid, qid, sizeof(struct p9_qid));
1323 0 : ofid->mode = mode;
1324 0 : ofid->iounit = iounit;
1325 :
1326 0 : free_and_error:
1327 0 : p9_tag_remove(clnt, req);
1328 : error:
1329 : return err;
1330 : }
1331 : EXPORT_SYMBOL(p9_client_create_dotl);
1332 :
1333 0 : int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode,
1334 : char *extension)
1335 : {
1336 0 : int err;
1337 0 : struct p9_client *clnt;
1338 0 : struct p9_req_t *req;
1339 0 : struct p9_qid qid;
1340 0 : int iounit;
1341 :
1342 0 : p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1343 : fid->fid, name, perm, mode);
1344 0 : err = 0;
1345 0 : clnt = fid->clnt;
1346 :
1347 0 : if (fid->mode != -1)
1348 : return -EINVAL;
1349 :
1350 0 : req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1351 : mode, extension);
1352 0 : if (IS_ERR(req)) {
1353 0 : err = PTR_ERR(req);
1354 0 : goto error;
1355 : }
1356 :
1357 0 : err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1358 0 : if (err) {
1359 0 : trace_9p_protocol_dump(clnt, &req->rc);
1360 0 : goto free_and_error;
1361 : }
1362 :
1363 0 : p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1364 : qid.type,
1365 : (unsigned long long)qid.path,
1366 : qid.version, iounit);
1367 :
1368 0 : memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1369 0 : fid->mode = mode;
1370 0 : fid->iounit = iounit;
1371 :
1372 0 : free_and_error:
1373 0 : p9_tag_remove(clnt, req);
1374 : error:
1375 : return err;
1376 : }
1377 : EXPORT_SYMBOL(p9_client_fcreate);
1378 :
1379 0 : int p9_client_symlink(struct p9_fid *dfid, const char *name,
1380 : const char *symtgt, kgid_t gid, struct p9_qid *qid)
1381 : {
1382 0 : int err = 0;
1383 0 : struct p9_client *clnt;
1384 0 : struct p9_req_t *req;
1385 :
1386 0 : p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1387 : dfid->fid, name, symtgt);
1388 0 : clnt = dfid->clnt;
1389 :
1390 0 : req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1391 : gid);
1392 0 : if (IS_ERR(req)) {
1393 0 : err = PTR_ERR(req);
1394 0 : goto error;
1395 : }
1396 :
1397 0 : err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
1398 0 : if (err) {
1399 0 : trace_9p_protocol_dump(clnt, &req->rc);
1400 0 : goto free_and_error;
1401 : }
1402 :
1403 : p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1404 : qid->type, (unsigned long long)qid->path, qid->version);
1405 :
1406 0 : free_and_error:
1407 0 : p9_tag_remove(clnt, req);
1408 0 : error:
1409 0 : return err;
1410 : }
1411 : EXPORT_SYMBOL(p9_client_symlink);
1412 :
1413 0 : int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname)
1414 : {
1415 0 : struct p9_client *clnt;
1416 0 : struct p9_req_t *req;
1417 :
1418 0 : p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1419 : dfid->fid, oldfid->fid, newname);
1420 0 : clnt = dfid->clnt;
1421 0 : req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1422 : newname);
1423 0 : if (IS_ERR(req))
1424 0 : return PTR_ERR(req);
1425 :
1426 0 : p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1427 0 : p9_tag_remove(clnt, req);
1428 0 : return 0;
1429 : }
1430 : EXPORT_SYMBOL(p9_client_link);
1431 :
1432 0 : int p9_client_fsync(struct p9_fid *fid, int datasync)
1433 : {
1434 0 : int err;
1435 0 : struct p9_client *clnt;
1436 0 : struct p9_req_t *req;
1437 :
1438 0 : p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1439 : fid->fid, datasync);
1440 0 : err = 0;
1441 0 : clnt = fid->clnt;
1442 :
1443 0 : req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1444 0 : if (IS_ERR(req)) {
1445 0 : err = PTR_ERR(req);
1446 0 : goto error;
1447 : }
1448 :
1449 0 : p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1450 :
1451 0 : p9_tag_remove(clnt, req);
1452 :
1453 0 : error:
1454 0 : return err;
1455 : }
1456 : EXPORT_SYMBOL(p9_client_fsync);
1457 :
1458 0 : int p9_client_clunk(struct p9_fid *fid)
1459 : {
1460 0 : int err;
1461 0 : struct p9_client *clnt;
1462 0 : struct p9_req_t *req;
1463 0 : int retries = 0;
1464 :
1465 0 : if (!fid || IS_ERR(fid)) {
1466 0 : pr_warn("%s (%d): Trying to clunk with invalid fid\n",
1467 : __func__, task_pid_nr(current));
1468 0 : dump_stack();
1469 0 : return 0;
1470 : }
1471 0 : if (!refcount_dec_and_test(&fid->count))
1472 : return 0;
1473 :
1474 0 : again:
1475 0 : p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1476 : retries);
1477 0 : err = 0;
1478 0 : clnt = fid->clnt;
1479 :
1480 0 : req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1481 0 : if (IS_ERR(req)) {
1482 0 : err = PTR_ERR(req);
1483 0 : goto error;
1484 : }
1485 :
1486 0 : p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1487 :
1488 0 : p9_tag_remove(clnt, req);
1489 0 : error:
1490 : /*
1491 : * Fid is not valid even after a failed clunk
1492 : * If interrupted, retry once then give up and
1493 : * leak fid until umount.
1494 : */
1495 0 : if (err == -ERESTARTSYS) {
1496 0 : if (retries++ == 0)
1497 0 : goto again;
1498 : } else
1499 0 : p9_fid_destroy(fid);
1500 : return err;
1501 : }
1502 : EXPORT_SYMBOL(p9_client_clunk);
1503 :
1504 0 : int p9_client_remove(struct p9_fid *fid)
1505 : {
1506 0 : int err;
1507 0 : struct p9_client *clnt;
1508 0 : struct p9_req_t *req;
1509 :
1510 0 : p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1511 0 : err = 0;
1512 0 : clnt = fid->clnt;
1513 :
1514 0 : req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1515 0 : if (IS_ERR(req)) {
1516 0 : err = PTR_ERR(req);
1517 0 : goto error;
1518 : }
1519 :
1520 0 : p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1521 :
1522 0 : p9_tag_remove(clnt, req);
1523 0 : error:
1524 0 : if (err == -ERESTARTSYS)
1525 0 : p9_client_clunk(fid);
1526 : else
1527 0 : p9_fid_destroy(fid);
1528 0 : return err;
1529 : }
1530 : EXPORT_SYMBOL(p9_client_remove);
1531 :
1532 0 : int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1533 : {
1534 0 : int err = 0;
1535 0 : struct p9_req_t *req;
1536 0 : struct p9_client *clnt;
1537 :
1538 0 : p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1539 : dfid->fid, name, flags);
1540 :
1541 0 : clnt = dfid->clnt;
1542 0 : req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1543 0 : if (IS_ERR(req)) {
1544 0 : err = PTR_ERR(req);
1545 0 : goto error;
1546 : }
1547 0 : p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1548 :
1549 0 : p9_tag_remove(clnt, req);
1550 0 : error:
1551 0 : return err;
1552 : }
1553 : EXPORT_SYMBOL(p9_client_unlinkat);
1554 :
1555 : int
1556 0 : p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
1557 : {
1558 0 : int total = 0;
1559 0 : *err = 0;
1560 :
1561 0 : while (iov_iter_count(to)) {
1562 0 : int count;
1563 :
1564 0 : count = p9_client_read_once(fid, offset, to, err);
1565 0 : if (!count || *err)
1566 : break;
1567 0 : offset += count;
1568 0 : total += count;
1569 : }
1570 0 : return total;
1571 : }
1572 : EXPORT_SYMBOL(p9_client_read);
1573 :
1574 : int
1575 0 : p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to,
1576 : int *err)
1577 : {
1578 0 : struct p9_client *clnt = fid->clnt;
1579 0 : struct p9_req_t *req;
1580 0 : int count = iov_iter_count(to);
1581 0 : int rsize, non_zc = 0;
1582 0 : char *dataptr;
1583 :
1584 0 : *err = 0;
1585 0 : p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1586 : fid->fid, (unsigned long long) offset, (int)iov_iter_count(to));
1587 :
1588 0 : rsize = fid->iounit;
1589 0 : if (!rsize || rsize > clnt->msize - P9_IOHDRSZ)
1590 0 : rsize = clnt->msize - P9_IOHDRSZ;
1591 :
1592 0 : if (count < rsize)
1593 : rsize = count;
1594 :
1595 : /* Don't bother zerocopy for small IO (< 1024) */
1596 0 : if (clnt->trans_mod->zc_request && rsize > 1024) {
1597 : /* response header len is 11
1598 : * PDU Header(7) + IO Size (4)
1599 : */
1600 0 : req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize,
1601 : 0, 11, "dqd", fid->fid,
1602 : offset, rsize);
1603 : } else {
1604 0 : non_zc = 1;
1605 0 : req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1606 : rsize);
1607 : }
1608 0 : if (IS_ERR(req)) {
1609 0 : *err = PTR_ERR(req);
1610 0 : return 0;
1611 : }
1612 :
1613 0 : *err = p9pdu_readf(&req->rc, clnt->proto_version,
1614 : "D", &count, &dataptr);
1615 0 : if (*err) {
1616 0 : trace_9p_protocol_dump(clnt, &req->rc);
1617 0 : p9_tag_remove(clnt, req);
1618 0 : return 0;
1619 : }
1620 0 : if (rsize < count) {
1621 0 : pr_err("bogus RREAD count (%d > %d)\n", count, rsize);
1622 0 : count = rsize;
1623 : }
1624 :
1625 0 : p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1626 :
1627 0 : if (non_zc) {
1628 0 : int n = copy_to_iter(dataptr, count, to);
1629 :
1630 0 : if (n != count) {
1631 0 : *err = -EFAULT;
1632 0 : p9_tag_remove(clnt, req);
1633 0 : return n;
1634 : }
1635 : } else {
1636 0 : iov_iter_advance(to, count);
1637 : }
1638 0 : p9_tag_remove(clnt, req);
1639 0 : return count;
1640 : }
1641 : EXPORT_SYMBOL(p9_client_read_once);
1642 :
1643 : int
1644 0 : p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
1645 : {
1646 0 : struct p9_client *clnt = fid->clnt;
1647 0 : struct p9_req_t *req;
1648 0 : int total = 0;
1649 0 : *err = 0;
1650 :
1651 0 : p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n",
1652 : fid->fid, (unsigned long long) offset,
1653 : iov_iter_count(from));
1654 :
1655 0 : while (iov_iter_count(from)) {
1656 0 : int count = iov_iter_count(from);
1657 0 : int rsize = fid->iounit;
1658 0 : if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1659 0 : rsize = clnt->msize - P9_IOHDRSZ;
1660 :
1661 0 : if (count < rsize)
1662 : rsize = count;
1663 :
1664 : /* Don't bother zerocopy for small IO (< 1024) */
1665 0 : if (clnt->trans_mod->zc_request && rsize > 1024) {
1666 0 : req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
1667 : rsize, P9_ZC_HDR_SZ, "dqd",
1668 : fid->fid, offset, rsize);
1669 : } else {
1670 0 : req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
1671 : offset, rsize, from);
1672 : }
1673 0 : if (IS_ERR(req)) {
1674 0 : *err = PTR_ERR(req);
1675 0 : break;
1676 : }
1677 :
1678 0 : *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &count);
1679 0 : if (*err) {
1680 0 : trace_9p_protocol_dump(clnt, &req->rc);
1681 0 : p9_tag_remove(clnt, req);
1682 0 : break;
1683 : }
1684 0 : if (rsize < count) {
1685 0 : pr_err("bogus RWRITE count (%d > %d)\n", count, rsize);
1686 0 : count = rsize;
1687 : }
1688 :
1689 0 : p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1690 :
1691 0 : p9_tag_remove(clnt, req);
1692 0 : iov_iter_advance(from, count);
1693 0 : total += count;
1694 0 : offset += count;
1695 : }
1696 0 : return total;
1697 : }
1698 : EXPORT_SYMBOL(p9_client_write);
1699 :
1700 0 : struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1701 : {
1702 0 : int err;
1703 0 : struct p9_client *clnt;
1704 0 : struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1705 0 : struct p9_req_t *req;
1706 0 : u16 ignored;
1707 :
1708 0 : p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1709 :
1710 0 : if (!ret)
1711 0 : return ERR_PTR(-ENOMEM);
1712 :
1713 0 : err = 0;
1714 0 : clnt = fid->clnt;
1715 :
1716 0 : req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1717 0 : if (IS_ERR(req)) {
1718 0 : err = PTR_ERR(req);
1719 0 : goto error;
1720 : }
1721 :
1722 0 : err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret);
1723 0 : if (err) {
1724 0 : trace_9p_protocol_dump(clnt, &req->rc);
1725 0 : p9_tag_remove(clnt, req);
1726 0 : goto error;
1727 : }
1728 :
1729 0 : p9_debug(P9_DEBUG_9P,
1730 : "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1731 : "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1732 : "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1733 : "<<< uid=%d gid=%d n_muid=%d\n",
1734 : ret->size, ret->type, ret->dev, ret->qid.type,
1735 : (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1736 : ret->atime, ret->mtime, (unsigned long long)ret->length,
1737 : ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1738 : from_kuid(&init_user_ns, ret->n_uid),
1739 : from_kgid(&init_user_ns, ret->n_gid),
1740 : from_kuid(&init_user_ns, ret->n_muid));
1741 :
1742 0 : p9_tag_remove(clnt, req);
1743 0 : return ret;
1744 :
1745 0 : error:
1746 0 : kfree(ret);
1747 0 : return ERR_PTR(err);
1748 : }
1749 : EXPORT_SYMBOL(p9_client_stat);
1750 :
1751 0 : struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1752 : u64 request_mask)
1753 : {
1754 0 : int err;
1755 0 : struct p9_client *clnt;
1756 0 : struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1757 : GFP_KERNEL);
1758 0 : struct p9_req_t *req;
1759 :
1760 0 : p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1761 : fid->fid, request_mask);
1762 :
1763 0 : if (!ret)
1764 0 : return ERR_PTR(-ENOMEM);
1765 :
1766 0 : err = 0;
1767 0 : clnt = fid->clnt;
1768 :
1769 0 : req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1770 0 : if (IS_ERR(req)) {
1771 0 : err = PTR_ERR(req);
1772 0 : goto error;
1773 : }
1774 :
1775 0 : err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret);
1776 0 : if (err) {
1777 0 : trace_9p_protocol_dump(clnt, &req->rc);
1778 0 : p9_tag_remove(clnt, req);
1779 0 : goto error;
1780 : }
1781 :
1782 0 : p9_debug(P9_DEBUG_9P,
1783 : "<<< RGETATTR st_result_mask=%lld\n"
1784 : "<<< qid=%x.%llx.%x\n"
1785 : "<<< st_mode=%8.8x st_nlink=%llu\n"
1786 : "<<< st_uid=%d st_gid=%d\n"
1787 : "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1788 : "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1789 : "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1790 : "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1791 : "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1792 : "<<< st_gen=%lld st_data_version=%lld\n",
1793 : ret->st_result_mask, ret->qid.type, ret->qid.path,
1794 : ret->qid.version, ret->st_mode, ret->st_nlink,
1795 : from_kuid(&init_user_ns, ret->st_uid),
1796 : from_kgid(&init_user_ns, ret->st_gid),
1797 : ret->st_rdev, ret->st_size, ret->st_blksize,
1798 : ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1799 : ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1800 : ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1801 : ret->st_gen, ret->st_data_version);
1802 :
1803 0 : p9_tag_remove(clnt, req);
1804 0 : return ret;
1805 :
1806 0 : error:
1807 0 : kfree(ret);
1808 0 : return ERR_PTR(err);
1809 : }
1810 : EXPORT_SYMBOL(p9_client_getattr_dotl);
1811 :
1812 0 : static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1813 : {
1814 0 : int ret;
1815 :
1816 : /* NOTE: size shouldn't include its own length */
1817 : /* size[2] type[2] dev[4] qid[13] */
1818 : /* mode[4] atime[4] mtime[4] length[8]*/
1819 : /* name[s] uid[s] gid[s] muid[s] */
1820 0 : ret = 2+4+13+4+4+4+8+2+2+2+2;
1821 :
1822 0 : if (wst->name)
1823 0 : ret += strlen(wst->name);
1824 0 : if (wst->uid)
1825 0 : ret += strlen(wst->uid);
1826 0 : if (wst->gid)
1827 0 : ret += strlen(wst->gid);
1828 0 : if (wst->muid)
1829 0 : ret += strlen(wst->muid);
1830 :
1831 0 : if ((proto_version == p9_proto_2000u) ||
1832 : (proto_version == p9_proto_2000L)) {
1833 0 : ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1834 0 : if (wst->extension)
1835 0 : ret += strlen(wst->extension);
1836 : }
1837 :
1838 0 : return ret;
1839 : }
1840 :
1841 0 : int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1842 : {
1843 0 : int err;
1844 0 : struct p9_req_t *req;
1845 0 : struct p9_client *clnt;
1846 :
1847 0 : err = 0;
1848 0 : clnt = fid->clnt;
1849 0 : wst->size = p9_client_statsize(wst, clnt->proto_version);
1850 0 : p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1851 0 : p9_debug(P9_DEBUG_9P,
1852 : " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1853 : " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1854 : " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1855 : " uid=%d gid=%d n_muid=%d\n",
1856 : wst->size, wst->type, wst->dev, wst->qid.type,
1857 : (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1858 : wst->atime, wst->mtime, (unsigned long long)wst->length,
1859 : wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1860 : from_kuid(&init_user_ns, wst->n_uid),
1861 : from_kgid(&init_user_ns, wst->n_gid),
1862 : from_kuid(&init_user_ns, wst->n_muid));
1863 :
1864 0 : req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1865 0 : if (IS_ERR(req)) {
1866 0 : err = PTR_ERR(req);
1867 0 : goto error;
1868 : }
1869 :
1870 0 : p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1871 :
1872 0 : p9_tag_remove(clnt, req);
1873 0 : error:
1874 0 : return err;
1875 : }
1876 : EXPORT_SYMBOL(p9_client_wstat);
1877 :
1878 0 : int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1879 : {
1880 0 : int err;
1881 0 : struct p9_req_t *req;
1882 0 : struct p9_client *clnt;
1883 :
1884 0 : err = 0;
1885 0 : clnt = fid->clnt;
1886 0 : p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1887 0 : p9_debug(P9_DEBUG_9P,
1888 : " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1889 : " atime_sec=%lld atime_nsec=%lld\n"
1890 : " mtime_sec=%lld mtime_nsec=%lld\n",
1891 : p9attr->valid, p9attr->mode,
1892 : from_kuid(&init_user_ns, p9attr->uid),
1893 : from_kgid(&init_user_ns, p9attr->gid),
1894 : p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1895 : p9attr->mtime_sec, p9attr->mtime_nsec);
1896 :
1897 0 : req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1898 :
1899 0 : if (IS_ERR(req)) {
1900 0 : err = PTR_ERR(req);
1901 0 : goto error;
1902 : }
1903 0 : p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1904 0 : p9_tag_remove(clnt, req);
1905 0 : error:
1906 0 : return err;
1907 : }
1908 : EXPORT_SYMBOL(p9_client_setattr);
1909 :
1910 0 : int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1911 : {
1912 0 : int err;
1913 0 : struct p9_req_t *req;
1914 0 : struct p9_client *clnt;
1915 :
1916 0 : err = 0;
1917 0 : clnt = fid->clnt;
1918 :
1919 0 : p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1920 :
1921 0 : req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1922 0 : if (IS_ERR(req)) {
1923 0 : err = PTR_ERR(req);
1924 0 : goto error;
1925 : }
1926 :
1927 0 : err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1928 : &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1929 : &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1930 0 : if (err) {
1931 0 : trace_9p_protocol_dump(clnt, &req->rc);
1932 0 : p9_tag_remove(clnt, req);
1933 0 : goto error;
1934 : }
1935 :
1936 0 : p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1937 : "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1938 : "fsid %llu namelen %ld\n",
1939 : fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1940 : sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1941 : sb->fsid, (long int)sb->namelen);
1942 :
1943 0 : p9_tag_remove(clnt, req);
1944 0 : error:
1945 0 : return err;
1946 : }
1947 : EXPORT_SYMBOL(p9_client_statfs);
1948 :
1949 0 : int p9_client_rename(struct p9_fid *fid,
1950 : struct p9_fid *newdirfid, const char *name)
1951 : {
1952 0 : int err;
1953 0 : struct p9_req_t *req;
1954 0 : struct p9_client *clnt;
1955 :
1956 0 : err = 0;
1957 0 : clnt = fid->clnt;
1958 :
1959 0 : p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1960 : fid->fid, newdirfid->fid, name);
1961 :
1962 0 : req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1963 : newdirfid->fid, name);
1964 0 : if (IS_ERR(req)) {
1965 0 : err = PTR_ERR(req);
1966 0 : goto error;
1967 : }
1968 :
1969 0 : p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1970 :
1971 0 : p9_tag_remove(clnt, req);
1972 0 : error:
1973 0 : return err;
1974 : }
1975 : EXPORT_SYMBOL(p9_client_rename);
1976 :
1977 0 : int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1978 : struct p9_fid *newdirfid, const char *new_name)
1979 : {
1980 0 : int err;
1981 0 : struct p9_req_t *req;
1982 0 : struct p9_client *clnt;
1983 :
1984 0 : err = 0;
1985 0 : clnt = olddirfid->clnt;
1986 :
1987 0 : p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1988 : " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1989 : newdirfid->fid, new_name);
1990 :
1991 0 : req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1992 : old_name, newdirfid->fid, new_name);
1993 0 : if (IS_ERR(req)) {
1994 0 : err = PTR_ERR(req);
1995 0 : goto error;
1996 : }
1997 :
1998 0 : p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1999 : newdirfid->fid, new_name);
2000 :
2001 0 : p9_tag_remove(clnt, req);
2002 0 : error:
2003 0 : return err;
2004 : }
2005 : EXPORT_SYMBOL(p9_client_renameat);
2006 :
2007 : /*
2008 : * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
2009 : */
2010 0 : struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
2011 : const char *attr_name, u64 *attr_size)
2012 : {
2013 0 : int err;
2014 0 : struct p9_req_t *req;
2015 0 : struct p9_client *clnt;
2016 0 : struct p9_fid *attr_fid;
2017 :
2018 0 : err = 0;
2019 0 : clnt = file_fid->clnt;
2020 0 : attr_fid = p9_fid_create(clnt);
2021 0 : if (!attr_fid) {
2022 0 : err = -ENOMEM;
2023 0 : goto error;
2024 : }
2025 0 : p9_debug(P9_DEBUG_9P,
2026 : ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2027 : file_fid->fid, attr_fid->fid, attr_name);
2028 :
2029 0 : req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2030 : file_fid->fid, attr_fid->fid, attr_name);
2031 0 : if (IS_ERR(req)) {
2032 0 : err = PTR_ERR(req);
2033 0 : goto error;
2034 : }
2035 0 : err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size);
2036 0 : if (err) {
2037 0 : trace_9p_protocol_dump(clnt, &req->rc);
2038 0 : p9_tag_remove(clnt, req);
2039 0 : goto clunk_fid;
2040 : }
2041 0 : p9_tag_remove(clnt, req);
2042 0 : p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2043 : attr_fid->fid, *attr_size);
2044 0 : return attr_fid;
2045 0 : clunk_fid:
2046 0 : p9_client_clunk(attr_fid);
2047 0 : attr_fid = NULL;
2048 0 : error:
2049 0 : if (attr_fid && (attr_fid != file_fid))
2050 0 : p9_fid_destroy(attr_fid);
2051 :
2052 0 : return ERR_PTR(err);
2053 : }
2054 : EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2055 :
2056 0 : int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2057 : u64 attr_size, int flags)
2058 : {
2059 0 : int err;
2060 0 : struct p9_req_t *req;
2061 0 : struct p9_client *clnt;
2062 :
2063 0 : p9_debug(P9_DEBUG_9P,
2064 : ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2065 : fid->fid, name, (long long)attr_size, flags);
2066 0 : err = 0;
2067 0 : clnt = fid->clnt;
2068 0 : req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2069 : fid->fid, name, attr_size, flags);
2070 0 : if (IS_ERR(req)) {
2071 0 : err = PTR_ERR(req);
2072 0 : goto error;
2073 : }
2074 0 : p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2075 0 : p9_tag_remove(clnt, req);
2076 0 : error:
2077 0 : return err;
2078 : }
2079 : EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2080 :
2081 0 : int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2082 : {
2083 0 : int err, rsize, non_zc = 0;
2084 0 : struct p9_client *clnt;
2085 0 : struct p9_req_t *req;
2086 0 : char *dataptr;
2087 0 : struct kvec kv = {.iov_base = data, .iov_len = count};
2088 0 : struct iov_iter to;
2089 :
2090 0 : iov_iter_kvec(&to, READ, &kv, 1, count);
2091 :
2092 0 : p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2093 : fid->fid, (unsigned long long) offset, count);
2094 :
2095 0 : err = 0;
2096 0 : clnt = fid->clnt;
2097 :
2098 0 : rsize = fid->iounit;
2099 0 : if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2100 0 : rsize = clnt->msize - P9_READDIRHDRSZ;
2101 :
2102 0 : if (count < rsize)
2103 0 : rsize = count;
2104 :
2105 : /* Don't bother zerocopy for small IO (< 1024) */
2106 0 : if (clnt->trans_mod->zc_request && rsize > 1024) {
2107 : /*
2108 : * response header len is 11
2109 : * PDU Header(7) + IO Size (4)
2110 : */
2111 0 : req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0,
2112 : 11, "dqd", fid->fid, offset, rsize);
2113 : } else {
2114 0 : non_zc = 1;
2115 0 : req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2116 : offset, rsize);
2117 : }
2118 0 : if (IS_ERR(req)) {
2119 0 : err = PTR_ERR(req);
2120 0 : goto error;
2121 : }
2122 :
2123 0 : err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr);
2124 0 : if (err) {
2125 0 : trace_9p_protocol_dump(clnt, &req->rc);
2126 0 : goto free_and_error;
2127 : }
2128 0 : if (rsize < count) {
2129 0 : pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize);
2130 0 : count = rsize;
2131 : }
2132 :
2133 0 : p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2134 :
2135 0 : if (non_zc)
2136 0 : memmove(data, dataptr, count);
2137 :
2138 0 : p9_tag_remove(clnt, req);
2139 0 : return count;
2140 :
2141 0 : free_and_error:
2142 0 : p9_tag_remove(clnt, req);
2143 : error:
2144 : return err;
2145 : }
2146 : EXPORT_SYMBOL(p9_client_readdir);
2147 :
2148 0 : int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode,
2149 : dev_t rdev, kgid_t gid, struct p9_qid *qid)
2150 : {
2151 0 : int err;
2152 0 : struct p9_client *clnt;
2153 0 : struct p9_req_t *req;
2154 :
2155 0 : err = 0;
2156 0 : clnt = fid->clnt;
2157 0 : p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2158 : "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2159 0 : req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2160 0 : MAJOR(rdev), MINOR(rdev), gid);
2161 0 : if (IS_ERR(req))
2162 0 : return PTR_ERR(req);
2163 :
2164 0 : err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
2165 0 : if (err) {
2166 0 : trace_9p_protocol_dump(clnt, &req->rc);
2167 0 : goto error;
2168 : }
2169 : p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2170 : (unsigned long long)qid->path, qid->version);
2171 :
2172 0 : error:
2173 0 : p9_tag_remove(clnt, req);
2174 0 : return err;
2175 :
2176 : }
2177 : EXPORT_SYMBOL(p9_client_mknod_dotl);
2178 :
2179 0 : int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode,
2180 : kgid_t gid, struct p9_qid *qid)
2181 : {
2182 0 : int err;
2183 0 : struct p9_client *clnt;
2184 0 : struct p9_req_t *req;
2185 :
2186 0 : err = 0;
2187 0 : clnt = fid->clnt;
2188 0 : p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2189 : fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2190 0 : req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
2191 : gid);
2192 0 : if (IS_ERR(req))
2193 0 : return PTR_ERR(req);
2194 :
2195 0 : err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
2196 0 : if (err) {
2197 0 : trace_9p_protocol_dump(clnt, &req->rc);
2198 0 : goto error;
2199 : }
2200 : p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2201 : (unsigned long long)qid->path, qid->version);
2202 :
2203 0 : error:
2204 0 : p9_tag_remove(clnt, req);
2205 0 : return err;
2206 :
2207 : }
2208 : EXPORT_SYMBOL(p9_client_mkdir_dotl);
2209 :
2210 0 : int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2211 : {
2212 0 : int err;
2213 0 : struct p9_client *clnt;
2214 0 : struct p9_req_t *req;
2215 :
2216 0 : err = 0;
2217 0 : clnt = fid->clnt;
2218 0 : p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2219 : "start %lld length %lld proc_id %d client_id %s\n",
2220 : fid->fid, flock->type, flock->flags, flock->start,
2221 : flock->length, flock->proc_id, flock->client_id);
2222 :
2223 0 : req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2224 : flock->flags, flock->start, flock->length,
2225 : flock->proc_id, flock->client_id);
2226 :
2227 0 : if (IS_ERR(req))
2228 0 : return PTR_ERR(req);
2229 :
2230 0 : err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status);
2231 0 : if (err) {
2232 0 : trace_9p_protocol_dump(clnt, &req->rc);
2233 0 : goto error;
2234 : }
2235 : p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2236 0 : error:
2237 0 : p9_tag_remove(clnt, req);
2238 0 : return err;
2239 :
2240 : }
2241 : EXPORT_SYMBOL(p9_client_lock_dotl);
2242 :
2243 0 : int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2244 : {
2245 0 : int err;
2246 0 : struct p9_client *clnt;
2247 0 : struct p9_req_t *req;
2248 :
2249 0 : err = 0;
2250 0 : clnt = fid->clnt;
2251 0 : p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2252 : "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2253 : glock->start, glock->length, glock->proc_id, glock->client_id);
2254 :
2255 0 : req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2256 : glock->start, glock->length, glock->proc_id, glock->client_id);
2257 :
2258 0 : if (IS_ERR(req))
2259 0 : return PTR_ERR(req);
2260 :
2261 0 : err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type,
2262 : &glock->start, &glock->length, &glock->proc_id,
2263 : &glock->client_id);
2264 0 : if (err) {
2265 0 : trace_9p_protocol_dump(clnt, &req->rc);
2266 0 : goto error;
2267 : }
2268 : p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2269 : "proc_id %d client_id %s\n", glock->type, glock->start,
2270 : glock->length, glock->proc_id, glock->client_id);
2271 0 : error:
2272 0 : p9_tag_remove(clnt, req);
2273 0 : return err;
2274 : }
2275 : EXPORT_SYMBOL(p9_client_getlock_dotl);
2276 :
2277 0 : int p9_client_readlink(struct p9_fid *fid, char **target)
2278 : {
2279 0 : int err;
2280 0 : struct p9_client *clnt;
2281 0 : struct p9_req_t *req;
2282 :
2283 0 : err = 0;
2284 0 : clnt = fid->clnt;
2285 0 : p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2286 :
2287 0 : req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2288 0 : if (IS_ERR(req))
2289 0 : return PTR_ERR(req);
2290 :
2291 0 : err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target);
2292 0 : if (err) {
2293 0 : trace_9p_protocol_dump(clnt, &req->rc);
2294 0 : goto error;
2295 : }
2296 : p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2297 0 : error:
2298 0 : p9_tag_remove(clnt, req);
2299 0 : return err;
2300 : }
2301 : EXPORT_SYMBOL(p9_client_readlink);
2302 :
2303 1 : int __init p9_client_init(void)
2304 : {
2305 1 : p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU);
2306 1 : return p9_req_cache ? 0 : -ENOMEM;
2307 : }
2308 :
2309 0 : void __exit p9_client_exit(void)
2310 : {
2311 0 : kmem_cache_destroy(p9_req_cache);
2312 0 : }
|
