?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Linux 4.19.133
[linux/fpc-iii.git] / net / 9p / client.c
blobd62f83f93d7bbf89549d62ec126aa398f965e710
1 /*
2 * net/9p/clnt.c
3 *
4 * 9P Client
5 *
6 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
23 *
24 */
25
26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
27
28 #include <linux/module.h>
29 #include <linux/errno.h>
30 #include <linux/fs.h>
31 #include <linux/poll.h>
32 #include <linux/idr.h>
33 #include <linux/mutex.h>
34 #include <linux/slab.h>
35 #include <linux/sched/signal.h>
36 #include <linux/uaccess.h>
37 #include <linux/uio.h>
38 #include <net/9p/9p.h>
39 #include <linux/parser.h>
40 #include <linux/seq_file.h>
41 #include <net/9p/client.h>
42 #include <net/9p/transport.h>
43 #include "protocol.h"
44
45 #define CREATE_TRACE_POINTS
46 #include <trace/events/9p.h>
47
48 /*
49 * Client Option Parsing (code inspired by NFS code)
50 * - a little lazy - parse all client options
51 */
52
53 enum {
54 Opt_msize,
55 Opt_trans,
56 Opt_legacy,
57 Opt_version,
58 Opt_err,
59 };
60
61 static const match_table_t tokens = {
62 {Opt_msize, "msize=%u"},
63 {Opt_legacy, "noextend"},
64 {Opt_trans, "trans=%s"},
65 {Opt_version, "version=%s"},
66 {Opt_err, NULL},
67 };
68
69 inline int p9_is_proto_dotl(struct p9_client *clnt)
70 {
71 return clnt->proto_version == p9_proto_2000L;
72 }
73 EXPORT_SYMBOL(p9_is_proto_dotl);
74
75 inline int p9_is_proto_dotu(struct p9_client *clnt)
76 {
77 return clnt->proto_version == p9_proto_2000u;
78 }
79 EXPORT_SYMBOL(p9_is_proto_dotu);
80
81 int p9_show_client_options(struct seq_file *m, struct p9_client *clnt)
82 {
83 if (clnt->msize != 8192)
84 seq_printf(m, ",msize=%u", clnt->msize);
85 seq_printf(m, ",trans=%s", clnt->trans_mod->name);
86
87 switch (clnt->proto_version) {
88 case p9_proto_legacy:
89 seq_puts(m, ",noextend");
90 break;
91 case p9_proto_2000u:
92 seq_puts(m, ",version=9p2000.u");
93 break;
94 case p9_proto_2000L:
95 /* Default */
96 break;
97 }
98
99 if (clnt->trans_mod->show_options)
100 return clnt->trans_mod->show_options(m, clnt);
101 return 0;
102 }
103 EXPORT_SYMBOL(p9_show_client_options);
104
105 /*
106 * Some error codes are taken directly from the server replies,
107 * make sure they are valid.
108 */
109 static int safe_errno(int err)
110 {
111 if ((err > 0) || (err < -MAX_ERRNO)) {
112 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err);
113 return -EPROTO;
114 }
115 return err;
116 }
117
118
119 /* Interpret mount option for protocol version */
120 static int get_protocol_version(char *s)
121 {
122 int version = -EINVAL;
123
124 if (!strcmp(s, "9p2000")) {
125 version = p9_proto_legacy;
126 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n");
127 } else if (!strcmp(s, "9p2000.u")) {
128 version = p9_proto_2000u;
129 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
130 } else if (!strcmp(s, "9p2000.L")) {
131 version = p9_proto_2000L;
132 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
133 } else
134 pr_info("Unknown protocol version %s\n", s);
135
136 return version;
137 }
138
139 /**
140 * parse_options - parse mount options into client structure
141 * @opts: options string passed from mount
142 * @clnt: existing v9fs client information
143 *
144 * Return 0 upon success, -ERRNO upon failure
145 */
146
147 static int parse_opts(char *opts, struct p9_client *clnt)
148 {
149 char *options, *tmp_options;
150 char *p;
151 substring_t args[MAX_OPT_ARGS];
152 int option;
153 char *s;
154 int ret = 0;
155
156 clnt->proto_version = p9_proto_2000L;
157 clnt->msize = 8192;
158
159 if (!opts)
160 return 0;
161
162 tmp_options = kstrdup(opts, GFP_KERNEL);
163 if (!tmp_options) {
164 p9_debug(P9_DEBUG_ERROR,
165 "failed to allocate copy of option string\n");
166 return -ENOMEM;
167 }
168 options = tmp_options;
169
170 while ((p = strsep(&options, ",")) != NULL) {
171 int token, r;
172 if (!*p)
173 continue;
174 token = match_token(p, tokens, args);
175 switch (token) {
176 case Opt_msize:
177 r = match_int(&args[0], &option);
178 if (r < 0) {
179 p9_debug(P9_DEBUG_ERROR,
180 "integer field, but no integer?\n");
181 ret = r;
182 continue;
183 }
184 if (option < 4096) {
185 p9_debug(P9_DEBUG_ERROR,
186 "msize should be at least 4k\n");
187 ret = -EINVAL;
188 continue;
189 }
190 clnt->msize = option;
191 break;
192 case Opt_trans:
193 s = match_strdup(&args[0]);
194 if (!s) {
195 ret = -ENOMEM;
196 p9_debug(P9_DEBUG_ERROR,
197 "problem allocating copy of trans arg\n");
198 goto free_and_return;
199 }
200
201 v9fs_put_trans(clnt->trans_mod);
202 clnt->trans_mod = v9fs_get_trans_by_name(s);
203 if (clnt->trans_mod == NULL) {
204 pr_info("Could not find request transport: %s\n",
205 s);
206 ret = -EINVAL;
207 }
208 kfree(s);
209 break;
210 case Opt_legacy:
211 clnt->proto_version = p9_proto_legacy;
212 break;
213 case Opt_version:
214 s = match_strdup(&args[0]);
215 if (!s) {
216 ret = -ENOMEM;
217 p9_debug(P9_DEBUG_ERROR,
218 "problem allocating copy of version arg\n");
219 goto free_and_return;
220 }
221 r = get_protocol_version(s);
222 if (r < 0)
223 ret = r;
224 else
225 clnt->proto_version = r;
226 kfree(s);
227 break;
228 default:
229 continue;
230 }
231 }
232
233 free_and_return:
234 if (ret)
235 v9fs_put_trans(clnt->trans_mod);
236 kfree(tmp_options);
237 return ret;
238 }
239
240 static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc,
241 int alloc_msize)
242 {
243 if (likely(c->fcall_cache) && alloc_msize == c->msize) {
244 fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS);
245 fc->cache = c->fcall_cache;
246 } else {
247 fc->sdata = kmalloc(alloc_msize, GFP_NOFS);
248 fc->cache = NULL;
249 }
250 if (!fc->sdata)
251 return -ENOMEM;
252 fc->capacity = alloc_msize;
253 return 0;
254 }
255
256 void p9_fcall_fini(struct p9_fcall *fc)
257 {
258 /* sdata can be NULL for interrupted requests in trans_rdma,
259 * and kmem_cache_free does not do NULL-check for us
260 */
261 if (unlikely(!fc->sdata))
262 return;
263
264 if (fc->cache)
265 kmem_cache_free(fc->cache, fc->sdata);
266 else
267 kfree(fc->sdata);
268 }
269 EXPORT_SYMBOL(p9_fcall_fini);
270
271 static struct kmem_cache *p9_req_cache;
272
273 /**
274 * p9_req_alloc - Allocate a new request.
275 * @c: Client session.
276 * @type: Transaction type.
277 * @max_size: Maximum packet size for this request.
278 *
279 * Context: Process context.
280 * Return: Pointer to new request.
281 */
282 static struct p9_req_t *
283 p9_tag_alloc(struct p9_client *c, int8_t type, unsigned int max_size)
284 {
285 struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS);
286 int alloc_msize = min(c->msize, max_size);
287 int tag;
288
289 if (!req)
290 return ERR_PTR(-ENOMEM);
291
292 if (p9_fcall_init(c, &req->tc, alloc_msize))
293 goto free_req;
294 if (p9_fcall_init(c, &req->rc, alloc_msize))
295 goto free;
296
297 p9pdu_reset(&req->tc);
298 p9pdu_reset(&req->rc);
299 req->t_err = 0;
300 req->status = REQ_STATUS_ALLOC;
301 init_waitqueue_head(&req->wq);
302 INIT_LIST_HEAD(&req->req_list);
303
304 idr_preload(GFP_NOFS);
305 spin_lock_irq(&c->lock);
306 if (type == P9_TVERSION)
307 tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1,
308 GFP_NOWAIT);
309 else
310 tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT);
311 req->tc.tag = tag;
312 spin_unlock_irq(&c->lock);
313 idr_preload_end();
314 if (tag < 0)
315 goto free;
316
317 /* Init ref to two because in the general case there is one ref
318 * that is put asynchronously by a writer thread, one ref
319 * temporarily given by p9_tag_lookup and put by p9_client_cb
320 * in the recv thread, and one ref put by p9_tag_remove in the
321 * main thread. The only exception is virtio that does not use
322 * p9_tag_lookup but does not have a writer thread either
323 * (the write happens synchronously in the request/zc_request
324 * callback), so p9_client_cb eats the second ref there
325 * as the pointer is duplicated directly by virtqueue_add_sgs()
326 */
327 refcount_set(&req->refcount.refcount, 2);
328
329 return req;
330
331 free:
332 p9_fcall_fini(&req->tc);
333 p9_fcall_fini(&req->rc);
334 free_req:
335 kmem_cache_free(p9_req_cache, req);
336 return ERR_PTR(-ENOMEM);
337 }
338
339 /**
340 * p9_tag_lookup - Look up a request by tag.
341 * @c: Client session.
342 * @tag: Transaction ID.
343 *
344 * Context: Any context.
345 * Return: A request, or %NULL if there is no request with that tag.
346 */
347 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
348 {
349 struct p9_req_t *req;
350
351 rcu_read_lock();
352 again:
353 req = idr_find(&c->reqs, tag);
354 if (req) {
355 /* We have to be careful with the req found under rcu_read_lock
356 * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the
357 * ref again without corrupting other data, then check again
358 * that the tag matches once we have the ref
359 */
360 if (!p9_req_try_get(req))
361 goto again;
362 if (req->tc.tag != tag) {
363 p9_req_put(req);
364 goto again;
365 }
366 }
367 rcu_read_unlock();
368
369 return req;
370 }
371 EXPORT_SYMBOL(p9_tag_lookup);
372
373 /**
374 * p9_tag_remove - Remove a tag.
375 * @c: Client session.
376 * @r: Request of reference.
377 *
378 * Context: Any context.
379 */
380 static int p9_tag_remove(struct p9_client *c, struct p9_req_t *r)
381 {
382 unsigned long flags;
383 u16 tag = r->tc.tag;
384
385 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
386 spin_lock_irqsave(&c->lock, flags);
387 idr_remove(&c->reqs, tag);
388 spin_unlock_irqrestore(&c->lock, flags);
389 return p9_req_put(r);
390 }
391
392 static void p9_req_free(struct kref *ref)
393 {
394 struct p9_req_t *r = container_of(ref, struct p9_req_t, refcount);
395 p9_fcall_fini(&r->tc);
396 p9_fcall_fini(&r->rc);
397 kmem_cache_free(p9_req_cache, r);
398 }
399
400 int p9_req_put(struct p9_req_t *r)
401 {
402 return kref_put(&r->refcount, p9_req_free);
403 }
404 EXPORT_SYMBOL(p9_req_put);
405
406 /**
407 * p9_tag_cleanup - cleans up tags structure and reclaims resources
408 * @c: v9fs client struct
409 *
410 * This frees resources associated with the tags structure
411 *
412 */
413 static void p9_tag_cleanup(struct p9_client *c)
414 {
415 struct p9_req_t *req;
416 int id;
417
418 rcu_read_lock();
419 idr_for_each_entry(&c->reqs, req, id) {
420 pr_info("Tag %d still in use\n", id);
421 if (p9_tag_remove(c, req) == 0)
422 pr_warn("Packet with tag %d has still references",
423 req->tc.tag);
424 }
425 rcu_read_unlock();
426 }
427
428 /**
429 * p9_client_cb - call back from transport to client
430 * c: client state
431 * req: request received
432 *
433 */
434 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
435 {
436 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag);
437
438 /*
439 * This barrier is needed to make sure any change made to req before
440 * the status change is visible to another thread
441 */
442 smp_wmb();
443 req->status = status;
444
445 wake_up(&req->wq);
446 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag);
447 p9_req_put(req);
448 }
449 EXPORT_SYMBOL(p9_client_cb);
450
451 /**
452 * p9_parse_header - parse header arguments out of a packet
453 * @pdu: packet to parse
454 * @size: size of packet
455 * @type: type of request
456 * @tag: tag of packet
457 * @rewind: set if we need to rewind offset afterwards
458 */
459
460 int
461 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
462 int rewind)
463 {
464 int8_t r_type;
465 int16_t r_tag;
466 int32_t r_size;
467 int offset = pdu->offset;
468 int err;
469
470 pdu->offset = 0;
471
472 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
473 if (err)
474 goto rewind_and_exit;
475
476 if (type)
477 *type = r_type;
478 if (tag)
479 *tag = r_tag;
480 if (size)
481 *size = r_size;
482
483 if (pdu->size != r_size || r_size < 7) {
484 err = -EINVAL;
485 goto rewind_and_exit;
486 }
487
488 pdu->id = r_type;
489 pdu->tag = r_tag;
490
491 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
492 pdu->size, pdu->id, pdu->tag);
493
494 rewind_and_exit:
495 if (rewind)
496 pdu->offset = offset;
497 return err;
498 }
499 EXPORT_SYMBOL(p9_parse_header);
500
501 /**
502 * p9_check_errors - check 9p packet for error return and process it
503 * @c: current client instance
504 * @req: request to parse and check for error conditions
505 *
506 * returns error code if one is discovered, otherwise returns 0
507 *
508 * this will have to be more complicated if we have multiple
509 * error packet types
510 */
511
512 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
513 {
514 int8_t type;
515 int err;
516 int ecode;
517
518 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0);
519 if (req->rc.size >= c->msize) {
520 p9_debug(P9_DEBUG_ERROR,
521 "requested packet size too big: %d\n",
522 req->rc.size);
523 return -EIO;
524 }
525 /*
526 * dump the response from server
527 * This should be after check errors which poplulate pdu_fcall.
528 */
529 trace_9p_protocol_dump(c, &req->rc);
530 if (err) {
531 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
532 return err;
533 }
534 if (type != P9_RERROR && type != P9_RLERROR)
535 return 0;
536
537 if (!p9_is_proto_dotl(c)) {
538 char *ename;
539 err = p9pdu_readf(&req->rc, c->proto_version, "s?d",
540 &ename, &ecode);
541 if (err)
542 goto out_err;
543
544 if (p9_is_proto_dotu(c) && ecode < 512)
545 err = -ecode;
546
547 if (!err) {
548 err = p9_errstr2errno(ename, strlen(ename));
549
550 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
551 -ecode, ename);
552 }
553 kfree(ename);
554 } else {
555 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode);
556 err = -ecode;
557
558 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
559 }
560
561 return err;
562
563 out_err:
564 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
565
566 return err;
567 }
568
569 /**
570 * p9_check_zc_errors - check 9p packet for error return and process it
571 * @c: current client instance
572 * @req: request to parse and check for error conditions
573 * @in_hdrlen: Size of response protocol buffer.
574 *
575 * returns error code if one is discovered, otherwise returns 0
576 *
577 * this will have to be more complicated if we have multiple
578 * error packet types
579 */
580
581 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
582 struct iov_iter *uidata, int in_hdrlen)
583 {
584 int err;
585 int ecode;
586 int8_t type;
587 char *ename = NULL;
588
589 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0);
590 /*
591 * dump the response from server
592 * This should be after parse_header which poplulate pdu_fcall.
593 */
594 trace_9p_protocol_dump(c, &req->rc);
595 if (err) {
596 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
597 return err;
598 }
599
600 if (type != P9_RERROR && type != P9_RLERROR)
601 return 0;
602
603 if (!p9_is_proto_dotl(c)) {
604 /* Error is reported in string format */
605 int len;
606 /* 7 = header size for RERROR; */
607 int inline_len = in_hdrlen - 7;
608
609 len = req->rc.size - req->rc.offset;
610 if (len > (P9_ZC_HDR_SZ - 7)) {
611 err = -EFAULT;
612 goto out_err;
613 }
614
615 ename = &req->rc.sdata[req->rc.offset];
616 if (len > inline_len) {
617 /* We have error in external buffer */
618 if (!copy_from_iter_full(ename + inline_len,
619 len - inline_len, uidata)) {
620 err = -EFAULT;
621 goto out_err;
622 }
623 }
624 ename = NULL;
625 err = p9pdu_readf(&req->rc, c->proto_version, "s?d",
626 &ename, &ecode);
627 if (err)
628 goto out_err;
629
630 if (p9_is_proto_dotu(c) && ecode < 512)
631 err = -ecode;
632
633 if (!err) {
634 err = p9_errstr2errno(ename, strlen(ename));
635
636 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
637 -ecode, ename);
638 }
639 kfree(ename);
640 } else {
641 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode);
642 err = -ecode;
643
644 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
645 }
646 return err;
647
648 out_err:
649 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
650 return err;
651 }
652
653 static struct p9_req_t *
654 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
655
656 /**
657 * p9_client_flush - flush (cancel) a request
658 * @c: client state
659 * @oldreq: request to cancel
660 *
661 * This sents a flush for a particular request and links
662 * the flush request to the original request. The current
663 * code only supports a single flush request although the protocol
664 * allows for multiple flush requests to be sent for a single request.
665 *
666 */
667
668 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
669 {
670 struct p9_req_t *req;
671 int16_t oldtag;
672 int err;
673
674 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1);
675 if (err)
676 return err;
677
678 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
679
680 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
681 if (IS_ERR(req))
682 return PTR_ERR(req);
683
684 /*
685 * if we haven't received a response for oldreq,
686 * remove it from the list
687 */
688 if (oldreq->status == REQ_STATUS_SENT) {
689 if (c->trans_mod->cancelled)
690 c->trans_mod->cancelled(c, oldreq);
691 }
692
693 p9_tag_remove(c, req);
694 return 0;
695 }
696
697 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
698 int8_t type, int req_size,
699 const char *fmt, va_list ap)
700 {
701 int err;
702 struct p9_req_t *req;
703
704 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
705
706 /* we allow for any status other than disconnected */
707 if (c->status == Disconnected)
708 return ERR_PTR(-EIO);
709
710 /* if status is begin_disconnected we allow only clunk request */
711 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
712 return ERR_PTR(-EIO);
713
714 req = p9_tag_alloc(c, type, req_size);
715 if (IS_ERR(req))
716 return req;
717
718 /* marshall the data */
719 p9pdu_prepare(&req->tc, req->tc.tag, type);
720 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap);
721 if (err)
722 goto reterr;
723 p9pdu_finalize(c, &req->tc);
724 trace_9p_client_req(c, type, req->tc.tag);
725 return req;
726 reterr:
727 p9_tag_remove(c, req);
728 /* We have to put also the 2nd reference as it won't be used */
729 p9_req_put(req);
730 return ERR_PTR(err);
731 }
732
733 /**
734 * p9_client_rpc - issue a request and wait for a response
735 * @c: client session
736 * @type: type of request
737 * @fmt: protocol format string (see protocol.c)
738 *
739 * Returns request structure (which client must free using p9_tag_remove)
740 */
741
742 static struct p9_req_t *
743 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
744 {
745 va_list ap;
746 int sigpending, err;
747 unsigned long flags;
748 struct p9_req_t *req;
749
750 va_start(ap, fmt);
751 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
752 va_end(ap);
753 if (IS_ERR(req))
754 return req;
755
756 if (signal_pending(current)) {
757 sigpending = 1;
758 clear_thread_flag(TIF_SIGPENDING);
759 } else
760 sigpending = 0;
761
762 err = c->trans_mod->request(c, req);
763 if (err < 0) {
764 /* write won't happen */
765 p9_req_put(req);
766 if (err != -ERESTARTSYS && err != -EFAULT)
767 c->status = Disconnected;
768 goto recalc_sigpending;
769 }
770 again:
771 /* Wait for the response */
772 err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD);
773
774 /*
775 * Make sure our req is coherent with regard to updates in other
776 * threads - echoes to wmb() in the callback
777 */
778 smp_rmb();
779
780 if ((err == -ERESTARTSYS) && (c->status == Connected)
781 && (type == P9_TFLUSH)) {
782 sigpending = 1;
783 clear_thread_flag(TIF_SIGPENDING);
784 goto again;
785 }
786
787 if (req->status == REQ_STATUS_ERROR) {
788 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
789 err = req->t_err;
790 }
791 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
792 p9_debug(P9_DEBUG_MUX, "flushing\n");
793 sigpending = 1;
794 clear_thread_flag(TIF_SIGPENDING);
795
796 if (c->trans_mod->cancel(c, req))
797 p9_client_flush(c, req);
798
799 /* if we received the response anyway, don't signal error */
800 if (req->status == REQ_STATUS_RCVD)
801 err = 0;
802 }
803 recalc_sigpending:
804 if (sigpending) {
805 spin_lock_irqsave(&current->sighand->siglock, flags);
806 recalc_sigpending();
807 spin_unlock_irqrestore(&current->sighand->siglock, flags);
808 }
809 if (err < 0)
810 goto reterr;
811
812 err = p9_check_errors(c, req);
813 trace_9p_client_res(c, type, req->rc.tag, err);
814 if (!err)
815 return req;
816 reterr:
817 p9_tag_remove(c, req);
818 return ERR_PTR(safe_errno(err));
819 }
820
821 /**
822 * p9_client_zc_rpc - issue a request and wait for a response
823 * @c: client session
824 * @type: type of request
825 * @uidata: destination for zero copy read
826 * @uodata: source for zero copy write
827 * @inlen: read buffer size
828 * @olen: write buffer size
829 * @hdrlen: reader header size, This is the size of response protocol data
830 * @fmt: protocol format string (see protocol.c)
831 *
832 * Returns request structure (which client must free using p9_tag_remove)
833 */
834 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
835 struct iov_iter *uidata,
836 struct iov_iter *uodata,
837 int inlen, int olen, int in_hdrlen,
838 const char *fmt, ...)
839 {
840 va_list ap;
841 int sigpending, err;
842 unsigned long flags;
843 struct p9_req_t *req;
844
845 va_start(ap, fmt);
846 /*
847 * We allocate a inline protocol data of only 4k bytes.
848 * The actual content is passed in zero-copy fashion.
849 */
850 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
851 va_end(ap);
852 if (IS_ERR(req))
853 return req;
854
855 if (signal_pending(current)) {
856 sigpending = 1;
857 clear_thread_flag(TIF_SIGPENDING);
858 } else
859 sigpending = 0;
860
861 err = c->trans_mod->zc_request(c, req, uidata, uodata,
862 inlen, olen, in_hdrlen);
863 if (err < 0) {
864 if (err == -EIO)
865 c->status = Disconnected;
866 if (err != -ERESTARTSYS)
867 goto recalc_sigpending;
868 }
869 if (req->status == REQ_STATUS_ERROR) {
870 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
871 err = req->t_err;
872 }
873 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
874 p9_debug(P9_DEBUG_MUX, "flushing\n");
875 sigpending = 1;
876 clear_thread_flag(TIF_SIGPENDING);
877
878 if (c->trans_mod->cancel(c, req))
879 p9_client_flush(c, req);
880
881 /* if we received the response anyway, don't signal error */
882 if (req->status == REQ_STATUS_RCVD)
883 err = 0;
884 }
885 recalc_sigpending:
886 if (sigpending) {
887 spin_lock_irqsave(&current->sighand->siglock, flags);
888 recalc_sigpending();
889 spin_unlock_irqrestore(&current->sighand->siglock, flags);
890 }
891 if (err < 0)
892 goto reterr;
893
894 err = p9_check_zc_errors(c, req, uidata, in_hdrlen);
895 trace_9p_client_res(c, type, req->rc.tag, err);
896 if (!err)
897 return req;
898 reterr:
899 p9_tag_remove(c, req);
900 return ERR_PTR(safe_errno(err));
901 }
902
903 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
904 {
905 int ret;
906 struct p9_fid *fid;
907
908 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
909 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
910 if (!fid)
911 return NULL;
912
913 memset(&fid->qid, 0, sizeof(struct p9_qid));
914 fid->mode = -1;
915 fid->uid = current_fsuid();
916 fid->clnt = clnt;
917 fid->rdir = NULL;
918 fid->fid = 0;
919
920 idr_preload(GFP_KERNEL);
921 spin_lock_irq(&clnt->lock);
922 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1,
923 GFP_NOWAIT);
924 spin_unlock_irq(&clnt->lock);
925 idr_preload_end();
926
927 if (!ret)
928 return fid;
929
930 kfree(fid);
931 return NULL;
932 }
933
934 static void p9_fid_destroy(struct p9_fid *fid)
935 {
936 struct p9_client *clnt;
937 unsigned long flags;
938
939 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
940 clnt = fid->clnt;
941 spin_lock_irqsave(&clnt->lock, flags);
942 idr_remove(&clnt->fids, fid->fid);
943 spin_unlock_irqrestore(&clnt->lock, flags);
944 kfree(fid->rdir);
945 kfree(fid);
946 }
947
948 static int p9_client_version(struct p9_client *c)
949 {
950 int err = 0;
951 struct p9_req_t *req;
952 char *version = NULL;
953 int msize;
954
955 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
956 c->msize, c->proto_version);
957
958 switch (c->proto_version) {
959 case p9_proto_2000L:
960 req = p9_client_rpc(c, P9_TVERSION, "ds",
961 c->msize, "9P2000.L");
962 break;
963 case p9_proto_2000u:
964 req = p9_client_rpc(c, P9_TVERSION, "ds",
965 c->msize, "9P2000.u");
966 break;
967 case p9_proto_legacy:
968 req = p9_client_rpc(c, P9_TVERSION, "ds",
969 c->msize, "9P2000");
970 break;
971 default:
972 return -EINVAL;
973 }
974
975 if (IS_ERR(req))
976 return PTR_ERR(req);
977
978 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version);
979 if (err) {
980 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
981 trace_9p_protocol_dump(c, &req->rc);
982 goto error;
983 }
984
985 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
986 if (!strncmp(version, "9P2000.L", 8))
987 c->proto_version = p9_proto_2000L;
988 else if (!strncmp(version, "9P2000.u", 8))
989 c->proto_version = p9_proto_2000u;
990 else if (!strncmp(version, "9P2000", 6))
991 c->proto_version = p9_proto_legacy;
992 else {
993 p9_debug(P9_DEBUG_ERROR,
994 "server returned an unknown version: %s\n", version);
995 err = -EREMOTEIO;
996 goto error;
997 }
998
999 if (msize < 4096) {
1000 p9_debug(P9_DEBUG_ERROR,
1001 "server returned a msize < 4096: %d\n", msize);
1002 err = -EREMOTEIO;
1003 goto error;
1004 }
1005 if (msize < c->msize)
1006 c->msize = msize;
1007
1008 error:
1009 kfree(version);
1010 p9_tag_remove(c, req);
1011
1012 return err;
1013 }
1014
1015 struct p9_client *p9_client_create(const char *dev_name, char *options)
1016 {
1017 int err;
1018 struct p9_client *clnt;
1019 char *client_id;
1020
1021 err = 0;
1022 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
1023 if (!clnt)
1024 return ERR_PTR(-ENOMEM);
1025
1026 clnt->trans_mod = NULL;
1027 clnt->trans = NULL;
1028 clnt->fcall_cache = NULL;
1029
1030 client_id = utsname()->nodename;
1031 memcpy(clnt->name, client_id, strlen(client_id) + 1);
1032
1033 spin_lock_init(&clnt->lock);
1034 idr_init(&clnt->fids);
1035 idr_init(&clnt->reqs);
1036
1037 err = parse_opts(options, clnt);
1038 if (err < 0)
1039 goto free_client;
1040
1041 if (!clnt->trans_mod)
1042 clnt->trans_mod = v9fs_get_default_trans();
1043
1044 if (clnt->trans_mod == NULL) {
1045 err = -EPROTONOSUPPORT;
1046 p9_debug(P9_DEBUG_ERROR,
1047 "No transport defined or default transport\n");
1048 goto free_client;
1049 }
1050
1051 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1052 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1053
1054 err = clnt->trans_mod->create(clnt, dev_name, options);
1055 if (err)
1056 goto put_trans;
1057
1058 if (clnt->msize > clnt->trans_mod->maxsize)
1059 clnt->msize = clnt->trans_mod->maxsize;
1060
1061 if (clnt->msize < 4096) {
1062 p9_debug(P9_DEBUG_ERROR,
1063 "Please specify a msize of at least 4k\n");
1064 err = -EINVAL;
1065 goto close_trans;
1066 }
1067
1068 err = p9_client_version(clnt);
1069 if (err)
1070 goto close_trans;
1071
1072 /* P9_HDRSZ + 4 is the smallest packet header we can have that is
1073 * followed by data accessed from userspace by read
1074 */
1075 clnt->fcall_cache =
1076 kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize,
1077 0, 0, P9_HDRSZ + 4,
1078 clnt->msize - (P9_HDRSZ + 4),
1079 NULL);
1080
1081 return clnt;
1082
1083 close_trans:
1084 clnt->trans_mod->close(clnt);
1085 put_trans:
1086 v9fs_put_trans(clnt->trans_mod);
1087 free_client:
1088 kfree(clnt);
1089 return ERR_PTR(err);
1090 }
1091 EXPORT_SYMBOL(p9_client_create);
1092
1093 void p9_client_destroy(struct p9_client *clnt)
1094 {
1095 struct p9_fid *fid;
1096 int id;
1097
1098 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1099
1100 if (clnt->trans_mod)
1101 clnt->trans_mod->close(clnt);
1102
1103 v9fs_put_trans(clnt->trans_mod);
1104
1105 idr_for_each_entry(&clnt->fids, fid, id) {
1106 pr_info("Found fid %d not clunked\n", fid->fid);
1107 p9_fid_destroy(fid);
1108 }
1109
1110 p9_tag_cleanup(clnt);
1111
1112 kmem_cache_destroy(clnt->fcall_cache);
1113 kfree(clnt);
1114 }
1115 EXPORT_SYMBOL(p9_client_destroy);
1116
1117 void p9_client_disconnect(struct p9_client *clnt)
1118 {
1119 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1120 clnt->status = Disconnected;
1121 }
1122 EXPORT_SYMBOL(p9_client_disconnect);
1123
1124 void p9_client_begin_disconnect(struct p9_client *clnt)
1125 {
1126 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1127 clnt->status = BeginDisconnect;
1128 }
1129 EXPORT_SYMBOL(p9_client_begin_disconnect);
1130
1131 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1132 const char *uname, kuid_t n_uname, const char *aname)
1133 {
1134 int err = 0;
1135 struct p9_req_t *req;
1136 struct p9_fid *fid;
1137 struct p9_qid qid;
1138
1139
1140 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1141 afid ? afid->fid : -1, uname, aname);
1142 fid = p9_fid_create(clnt);
1143 if (!fid) {
1144 err = -ENOMEM;
1145 goto error;
1146 }
1147 fid->uid = n_uname;
1148
1149 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1150 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1151 if (IS_ERR(req)) {
1152 err = PTR_ERR(req);
1153 goto error;
1154 }
1155
1156 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid);
1157 if (err) {
1158 trace_9p_protocol_dump(clnt, &req->rc);
1159 p9_tag_remove(clnt, req);
1160 goto error;
1161 }
1162
1163 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1164 qid.type, (unsigned long long)qid.path, qid.version);
1165
1166 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1167
1168 p9_tag_remove(clnt, req);
1169 return fid;
1170
1171 error:
1172 if (fid)
1173 p9_fid_destroy(fid);
1174 return ERR_PTR(err);
1175 }
1176 EXPORT_SYMBOL(p9_client_attach);
1177
1178 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1179 const unsigned char * const *wnames, int clone)
1180 {
1181 int err;
1182 struct p9_client *clnt;
1183 struct p9_fid *fid;
1184 struct p9_qid *wqids;
1185 struct p9_req_t *req;
1186 uint16_t nwqids, count;
1187
1188 err = 0;
1189 wqids = NULL;
1190 clnt = oldfid->clnt;
1191 if (clone) {
1192 fid = p9_fid_create(clnt);
1193 if (!fid) {
1194 err = -ENOMEM;
1195 goto error;
1196 }
1197
1198 fid->uid = oldfid->uid;
1199 } else
1200 fid = oldfid;
1201
1202
1203 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1204 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1205
1206 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1207 nwname, wnames);
1208 if (IS_ERR(req)) {
1209 err = PTR_ERR(req);
1210 goto error;
1211 }
1212
1213 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1214 if (err) {
1215 trace_9p_protocol_dump(clnt, &req->rc);
1216 p9_tag_remove(clnt, req);
1217 goto clunk_fid;
1218 }
1219 p9_tag_remove(clnt, req);
1220
1221 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1222
1223 if (nwqids != nwname) {
1224 err = -ENOENT;
1225 goto clunk_fid;
1226 }
1227
1228 for (count = 0; count < nwqids; count++)
1229 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1230 count, wqids[count].type,
1231 (unsigned long long)wqids[count].path,
1232 wqids[count].version);
1233
1234 if (nwname)
1235 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1236 else
1237 fid->qid = oldfid->qid;
1238
1239 kfree(wqids);
1240 return fid;
1241
1242 clunk_fid:
1243 kfree(wqids);
1244 p9_client_clunk(fid);
1245 fid = NULL;
1246
1247 error:
1248 if (fid && (fid != oldfid))
1249 p9_fid_destroy(fid);
1250
1251 return ERR_PTR(err);
1252 }
1253 EXPORT_SYMBOL(p9_client_walk);
1254
1255 int p9_client_open(struct p9_fid *fid, int mode)
1256 {
1257 int err;
1258 struct p9_client *clnt;
1259 struct p9_req_t *req;
1260 struct p9_qid qid;
1261 int iounit;
1262
1263 clnt = fid->clnt;
1264 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1265 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1266 err = 0;
1267
1268 if (fid->mode != -1)
1269 return -EINVAL;
1270
1271 if (p9_is_proto_dotl(clnt))
1272 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1273 else
1274 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1275 if (IS_ERR(req)) {
1276 err = PTR_ERR(req);
1277 goto error;
1278 }
1279
1280 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1281 if (err) {
1282 trace_9p_protocol_dump(clnt, &req->rc);
1283 goto free_and_error;
1284 }
1285
1286 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1287 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1288 (unsigned long long)qid.path, qid.version, iounit);
1289
1290 fid->mode = mode;
1291 fid->iounit = iounit;
1292
1293 free_and_error:
1294 p9_tag_remove(clnt, req);
1295 error:
1296 return err;
1297 }
1298 EXPORT_SYMBOL(p9_client_open);
1299
1300 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode,
1301 kgid_t gid, struct p9_qid *qid)
1302 {
1303 int err = 0;
1304 struct p9_client *clnt;
1305 struct p9_req_t *req;
1306 int iounit;
1307
1308 p9_debug(P9_DEBUG_9P,
1309 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1310 ofid->fid, name, flags, mode,
1311 from_kgid(&init_user_ns, gid));
1312 clnt = ofid->clnt;
1313
1314 if (ofid->mode != -1)
1315 return -EINVAL;
1316
1317 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1318 mode, gid);
1319 if (IS_ERR(req)) {
1320 err = PTR_ERR(req);
1321 goto error;
1322 }
1323
1324 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit);
1325 if (err) {
1326 trace_9p_protocol_dump(clnt, &req->rc);
1327 goto free_and_error;
1328 }
1329
1330 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1331 qid->type,
1332 (unsigned long long)qid->path,
1333 qid->version, iounit);
1334
1335 ofid->mode = mode;
1336 ofid->iounit = iounit;
1337
1338 free_and_error:
1339 p9_tag_remove(clnt, req);
1340 error:
1341 return err;
1342 }
1343 EXPORT_SYMBOL(p9_client_create_dotl);
1344
1345 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode,
1346 char *extension)
1347 {
1348 int err;
1349 struct p9_client *clnt;
1350 struct p9_req_t *req;
1351 struct p9_qid qid;
1352 int iounit;
1353
1354 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1355 fid->fid, name, perm, mode);
1356 err = 0;
1357 clnt = fid->clnt;
1358
1359 if (fid->mode != -1)
1360 return -EINVAL;
1361
1362 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1363 mode, extension);
1364 if (IS_ERR(req)) {
1365 err = PTR_ERR(req);
1366 goto error;
1367 }
1368
1369 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1370 if (err) {
1371 trace_9p_protocol_dump(clnt, &req->rc);
1372 goto free_and_error;
1373 }
1374
1375 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1376 qid.type,
1377 (unsigned long long)qid.path,
1378 qid.version, iounit);
1379
1380 fid->mode = mode;
1381 fid->iounit = iounit;
1382
1383 free_and_error:
1384 p9_tag_remove(clnt, req);
1385 error:
1386 return err;
1387 }
1388 EXPORT_SYMBOL(p9_client_fcreate);
1389
1390 int p9_client_symlink(struct p9_fid *dfid, const char *name,
1391 const char *symtgt, kgid_t gid, struct p9_qid *qid)
1392 {
1393 int err = 0;
1394 struct p9_client *clnt;
1395 struct p9_req_t *req;
1396
1397 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1398 dfid->fid, name, symtgt);
1399 clnt = dfid->clnt;
1400
1401 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1402 gid);
1403 if (IS_ERR(req)) {
1404 err = PTR_ERR(req);
1405 goto error;
1406 }
1407
1408 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
1409 if (err) {
1410 trace_9p_protocol_dump(clnt, &req->rc);
1411 goto free_and_error;
1412 }
1413
1414 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1415 qid->type, (unsigned long long)qid->path, qid->version);
1416
1417 free_and_error:
1418 p9_tag_remove(clnt, req);
1419 error:
1420 return err;
1421 }
1422 EXPORT_SYMBOL(p9_client_symlink);
1423
1424 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname)
1425 {
1426 struct p9_client *clnt;
1427 struct p9_req_t *req;
1428
1429 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1430 dfid->fid, oldfid->fid, newname);
1431 clnt = dfid->clnt;
1432 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1433 newname);
1434 if (IS_ERR(req))
1435 return PTR_ERR(req);
1436
1437 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1438 p9_tag_remove(clnt, req);
1439 return 0;
1440 }
1441 EXPORT_SYMBOL(p9_client_link);
1442
1443 int p9_client_fsync(struct p9_fid *fid, int datasync)
1444 {
1445 int err;
1446 struct p9_client *clnt;
1447 struct p9_req_t *req;
1448
1449 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1450 fid->fid, datasync);
1451 err = 0;
1452 clnt = fid->clnt;
1453
1454 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1455 if (IS_ERR(req)) {
1456 err = PTR_ERR(req);
1457 goto error;
1458 }
1459
1460 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1461
1462 p9_tag_remove(clnt, req);
1463
1464 error:
1465 return err;
1466 }
1467 EXPORT_SYMBOL(p9_client_fsync);
1468
1469 int p9_client_clunk(struct p9_fid *fid)
1470 {
1471 int err;
1472 struct p9_client *clnt;
1473 struct p9_req_t *req;
1474 int retries = 0;
1475
1476 if (!fid) {
1477 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1478 __func__, task_pid_nr(current));
1479 dump_stack();
1480 return 0;
1481 }
1482
1483 again:
1484 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1485 retries);
1486 err = 0;
1487 clnt = fid->clnt;
1488
1489 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1490 if (IS_ERR(req)) {
1491 err = PTR_ERR(req);
1492 goto error;
1493 }
1494
1495 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1496
1497 p9_tag_remove(clnt, req);
1498 error:
1499 /*
1500 * Fid is not valid even after a failed clunk
1501 * If interrupted, retry once then give up and
1502 * leak fid until umount.
1503 */
1504 if (err == -ERESTARTSYS) {
1505 if (retries++ == 0)
1506 goto again;
1507 } else
1508 p9_fid_destroy(fid);
1509 return err;
1510 }
1511 EXPORT_SYMBOL(p9_client_clunk);
1512
1513 int p9_client_remove(struct p9_fid *fid)
1514 {
1515 int err;
1516 struct p9_client *clnt;
1517 struct p9_req_t *req;
1518
1519 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1520 err = 0;
1521 clnt = fid->clnt;
1522
1523 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1524 if (IS_ERR(req)) {
1525 err = PTR_ERR(req);
1526 goto error;
1527 }
1528
1529 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1530
1531 p9_tag_remove(clnt, req);
1532 error:
1533 if (err == -ERESTARTSYS)
1534 p9_client_clunk(fid);
1535 else
1536 p9_fid_destroy(fid);
1537 return err;
1538 }
1539 EXPORT_SYMBOL(p9_client_remove);
1540
1541 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1542 {
1543 int err = 0;
1544 struct p9_req_t *req;
1545 struct p9_client *clnt;
1546
1547 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1548 dfid->fid, name, flags);
1549
1550 clnt = dfid->clnt;
1551 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1552 if (IS_ERR(req)) {
1553 err = PTR_ERR(req);
1554 goto error;
1555 }
1556 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1557
1558 p9_tag_remove(clnt, req);
1559 error:
1560 return err;
1561 }
1562 EXPORT_SYMBOL(p9_client_unlinkat);
1563
1564 int
1565 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
1566 {
1567 struct p9_client *clnt = fid->clnt;
1568 struct p9_req_t *req;
1569 int total = 0;
1570 *err = 0;
1571
1572 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1573 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to));
1574
1575 while (iov_iter_count(to)) {
1576 int count = iov_iter_count(to);
1577 int rsize, non_zc = 0;
1578 char *dataptr;
1579
1580 rsize = fid->iounit;
1581 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1582 rsize = clnt->msize - P9_IOHDRSZ;
1583
1584 if (count < rsize)
1585 rsize = count;
1586
1587 /* Don't bother zerocopy for small IO (< 1024) */
1588 if (clnt->trans_mod->zc_request && rsize > 1024) {
1589 /*
1590 * response header len is 11
1591 * PDU Header(7) + IO Size (4)
1592 */
1593 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize,
1594 0, 11, "dqd", fid->fid,
1595 offset, rsize);
1596 } else {
1597 non_zc = 1;
1598 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1599 rsize);
1600 }
1601 if (IS_ERR(req)) {
1602 *err = PTR_ERR(req);
1603 break;
1604 }
1605
1606 *err = p9pdu_readf(&req->rc, clnt->proto_version,
1607 "D", &count, &dataptr);
1608 if (*err) {
1609 trace_9p_protocol_dump(clnt, &req->rc);
1610 p9_tag_remove(clnt, req);
1611 break;
1612 }
1613 if (rsize < count) {
1614 pr_err("bogus RREAD count (%d > %d)\n", count, rsize);
1615 count = rsize;
1616 }
1617
1618 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1619 if (!count) {
1620 p9_tag_remove(clnt, req);
1621 break;
1622 }
1623
1624 if (non_zc) {
1625 int n = copy_to_iter(dataptr, count, to);
1626 total += n;
1627 offset += n;
1628 if (n != count) {
1629 *err = -EFAULT;
1630 p9_tag_remove(clnt, req);
1631 break;
1632 }
1633 } else {
1634 iov_iter_advance(to, count);
1635 total += count;
1636 offset += count;
1637 }
1638 p9_tag_remove(clnt, req);
1639 }
1640 return total;
1641 }
1642 EXPORT_SYMBOL(p9_client_read);
1643
1644 int
1645 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
1646 {
1647 struct p9_client *clnt = fid->clnt;
1648 struct p9_req_t *req;
1649 int total = 0;
1650 *err = 0;
1651
1652 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n",
1653 fid->fid, (unsigned long long) offset,
1654 iov_iter_count(from));
1655
1656 while (iov_iter_count(from)) {
1657 int count = iov_iter_count(from);
1658 int rsize = fid->iounit;
1659 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1660 rsize = clnt->msize - P9_IOHDRSZ;
1661
1662 if (count < rsize)
1663 rsize = count;
1664
1665 /* Don't bother zerocopy for small IO (< 1024) */
1666 if (clnt->trans_mod->zc_request && rsize > 1024) {
1667 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
1668 rsize, P9_ZC_HDR_SZ, "dqd",
1669 fid->fid, offset, rsize);
1670 } else {
1671 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
1672 offset, rsize, from);
1673 }
1674 if (IS_ERR(req)) {
1675 *err = PTR_ERR(req);
1676 break;
1677 }
1678
1679 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &count);
1680 if (*err) {
1681 trace_9p_protocol_dump(clnt, &req->rc);
1682 p9_tag_remove(clnt, req);
1683 break;
1684 }
1685 if (rsize < count) {
1686 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize);
1687 count = rsize;
1688 }
1689
1690 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1691
1692 p9_tag_remove(clnt, req);
1693 iov_iter_advance(from, count);
1694 total += count;
1695 offset += count;
1696 }
1697 return total;
1698 }
1699 EXPORT_SYMBOL(p9_client_write);
1700
1701 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1702 {
1703 int err;
1704 struct p9_client *clnt;
1705 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1706 struct p9_req_t *req;
1707 u16 ignored;
1708
1709 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1710
1711 if (!ret)
1712 return ERR_PTR(-ENOMEM);
1713
1714 err = 0;
1715 clnt = fid->clnt;
1716
1717 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1718 if (IS_ERR(req)) {
1719 err = PTR_ERR(req);
1720 goto error;
1721 }
1722
1723 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret);
1724 if (err) {
1725 trace_9p_protocol_dump(clnt, &req->rc);
1726 p9_tag_remove(clnt, req);
1727 goto error;
1728 }
1729
1730 p9_debug(P9_DEBUG_9P,
1731 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1732 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1733 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1734 "<<< uid=%d gid=%d n_muid=%d\n",
1735 ret->size, ret->type, ret->dev, ret->qid.type,
1736 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1737 ret->atime, ret->mtime, (unsigned long long)ret->length,
1738 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1739 from_kuid(&init_user_ns, ret->n_uid),
1740 from_kgid(&init_user_ns, ret->n_gid),
1741 from_kuid(&init_user_ns, ret->n_muid));
1742
1743 p9_tag_remove(clnt, req);
1744 return ret;
1745
1746 error:
1747 kfree(ret);
1748 return ERR_PTR(err);
1749 }
1750 EXPORT_SYMBOL(p9_client_stat);
1751
1752 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1753 u64 request_mask)
1754 {
1755 int err;
1756 struct p9_client *clnt;
1757 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1758 GFP_KERNEL);
1759 struct p9_req_t *req;
1760
1761 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1762 fid->fid, request_mask);
1763
1764 if (!ret)
1765 return ERR_PTR(-ENOMEM);
1766
1767 err = 0;
1768 clnt = fid->clnt;
1769
1770 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1771 if (IS_ERR(req)) {
1772 err = PTR_ERR(req);
1773 goto error;
1774 }
1775
1776 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret);
1777 if (err) {
1778 trace_9p_protocol_dump(clnt, &req->rc);
1779 p9_tag_remove(clnt, req);
1780 goto error;
1781 }
1782
1783 p9_debug(P9_DEBUG_9P,
1784 "<<< RGETATTR st_result_mask=%lld\n"
1785 "<<< qid=%x.%llx.%x\n"
1786 "<<< st_mode=%8.8x st_nlink=%llu\n"
1787 "<<< st_uid=%d st_gid=%d\n"
1788 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1789 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1790 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1791 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1792 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1793 "<<< st_gen=%lld st_data_version=%lld\n",
1794 ret->st_result_mask, ret->qid.type, ret->qid.path,
1795 ret->qid.version, ret->st_mode, ret->st_nlink,
1796 from_kuid(&init_user_ns, ret->st_uid),
1797 from_kgid(&init_user_ns, ret->st_gid),
1798 ret->st_rdev, ret->st_size, ret->st_blksize,
1799 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1800 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1801 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1802 ret->st_gen, ret->st_data_version);
1803
1804 p9_tag_remove(clnt, req);
1805 return ret;
1806
1807 error:
1808 kfree(ret);
1809 return ERR_PTR(err);
1810 }
1811 EXPORT_SYMBOL(p9_client_getattr_dotl);
1812
1813 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1814 {
1815 int ret;
1816
1817 /* NOTE: size shouldn't include its own length */
1818 /* size[2] type[2] dev[4] qid[13] */
1819 /* mode[4] atime[4] mtime[4] length[8]*/
1820 /* name[s] uid[s] gid[s] muid[s] */
1821 ret = 2+4+13+4+4+4+8+2+2+2+2;
1822
1823 if (wst->name)
1824 ret += strlen(wst->name);
1825 if (wst->uid)
1826 ret += strlen(wst->uid);
1827 if (wst->gid)
1828 ret += strlen(wst->gid);
1829 if (wst->muid)
1830 ret += strlen(wst->muid);
1831
1832 if ((proto_version == p9_proto_2000u) ||
1833 (proto_version == p9_proto_2000L)) {
1834 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1835 if (wst->extension)
1836 ret += strlen(wst->extension);
1837 }
1838
1839 return ret;
1840 }
1841
1842 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1843 {
1844 int err;
1845 struct p9_req_t *req;
1846 struct p9_client *clnt;
1847
1848 err = 0;
1849 clnt = fid->clnt;
1850 wst->size = p9_client_statsize(wst, clnt->proto_version);
1851 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1852 p9_debug(P9_DEBUG_9P,
1853 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1854 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1855 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1856 " uid=%d gid=%d n_muid=%d\n",
1857 wst->size, wst->type, wst->dev, wst->qid.type,
1858 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1859 wst->atime, wst->mtime, (unsigned long long)wst->length,
1860 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1861 from_kuid(&init_user_ns, wst->n_uid),
1862 from_kgid(&init_user_ns, wst->n_gid),
1863 from_kuid(&init_user_ns, wst->n_muid));
1864
1865 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1866 if (IS_ERR(req)) {
1867 err = PTR_ERR(req);
1868 goto error;
1869 }
1870
1871 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1872
1873 p9_tag_remove(clnt, req);
1874 error:
1875 return err;
1876 }
1877 EXPORT_SYMBOL(p9_client_wstat);
1878
1879 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1880 {
1881 int err;
1882 struct p9_req_t *req;
1883 struct p9_client *clnt;
1884
1885 err = 0;
1886 clnt = fid->clnt;
1887 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1888 p9_debug(P9_DEBUG_9P,
1889 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1890 " atime_sec=%lld atime_nsec=%lld\n"
1891 " mtime_sec=%lld mtime_nsec=%lld\n",
1892 p9attr->valid, p9attr->mode,
1893 from_kuid(&init_user_ns, p9attr->uid),
1894 from_kgid(&init_user_ns, p9attr->gid),
1895 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1896 p9attr->mtime_sec, p9attr->mtime_nsec);
1897
1898 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1899
1900 if (IS_ERR(req)) {
1901 err = PTR_ERR(req);
1902 goto error;
1903 }
1904 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1905 p9_tag_remove(clnt, req);
1906 error:
1907 return err;
1908 }
1909 EXPORT_SYMBOL(p9_client_setattr);
1910
1911 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1912 {
1913 int err;
1914 struct p9_req_t *req;
1915 struct p9_client *clnt;
1916
1917 err = 0;
1918 clnt = fid->clnt;
1919
1920 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1921
1922 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1923 if (IS_ERR(req)) {
1924 err = PTR_ERR(req);
1925 goto error;
1926 }
1927
1928 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1929 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1930 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1931 if (err) {
1932 trace_9p_protocol_dump(clnt, &req->rc);
1933 p9_tag_remove(clnt, req);
1934 goto error;
1935 }
1936
1937 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1938 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1939 "fsid %llu namelen %ld\n",
1940 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1941 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1942 sb->fsid, (long int)sb->namelen);
1943
1944 p9_tag_remove(clnt, req);
1945 error:
1946 return err;
1947 }
1948 EXPORT_SYMBOL(p9_client_statfs);
1949
1950 int p9_client_rename(struct p9_fid *fid,
1951 struct p9_fid *newdirfid, const char *name)
1952 {
1953 int err;
1954 struct p9_req_t *req;
1955 struct p9_client *clnt;
1956
1957 err = 0;
1958 clnt = fid->clnt;
1959
1960 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1961 fid->fid, newdirfid->fid, name);
1962
1963 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1964 newdirfid->fid, name);
1965 if (IS_ERR(req)) {
1966 err = PTR_ERR(req);
1967 goto error;
1968 }
1969
1970 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1971
1972 p9_tag_remove(clnt, req);
1973 error:
1974 return err;
1975 }
1976 EXPORT_SYMBOL(p9_client_rename);
1977
1978 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1979 struct p9_fid *newdirfid, const char *new_name)
1980 {
1981 int err;
1982 struct p9_req_t *req;
1983 struct p9_client *clnt;
1984
1985 err = 0;
1986 clnt = olddirfid->clnt;
1987
1988 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1989 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1990 newdirfid->fid, new_name);
1991
1992 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1993 old_name, newdirfid->fid, new_name);
1994 if (IS_ERR(req)) {
1995 err = PTR_ERR(req);
1996 goto error;
1997 }
1998
1999 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
2000 newdirfid->fid, new_name);
2001
2002 p9_tag_remove(clnt, req);
2003 error:
2004 return err;
2005 }
2006 EXPORT_SYMBOL(p9_client_renameat);
2007
2008 /*
2009 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
2010 */
2011 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
2012 const char *attr_name, u64 *attr_size)
2013 {
2014 int err;
2015 struct p9_req_t *req;
2016 struct p9_client *clnt;
2017 struct p9_fid *attr_fid;
2018
2019 err = 0;
2020 clnt = file_fid->clnt;
2021 attr_fid = p9_fid_create(clnt);
2022 if (!attr_fid) {
2023 err = -ENOMEM;
2024 goto error;
2025 }
2026 p9_debug(P9_DEBUG_9P,
2027 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2028 file_fid->fid, attr_fid->fid, attr_name);
2029
2030 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2031 file_fid->fid, attr_fid->fid, attr_name);
2032 if (IS_ERR(req)) {
2033 err = PTR_ERR(req);
2034 goto error;
2035 }
2036 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size);
2037 if (err) {
2038 trace_9p_protocol_dump(clnt, &req->rc);
2039 p9_tag_remove(clnt, req);
2040 goto clunk_fid;
2041 }
2042 p9_tag_remove(clnt, req);
2043 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2044 attr_fid->fid, *attr_size);
2045 return attr_fid;
2046 clunk_fid:
2047 p9_client_clunk(attr_fid);
2048 attr_fid = NULL;
2049 error:
2050 if (attr_fid && (attr_fid != file_fid))
2051 p9_fid_destroy(attr_fid);
2052
2053 return ERR_PTR(err);
2054 }
2055 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2056
2057 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2058 u64 attr_size, int flags)
2059 {
2060 int err;
2061 struct p9_req_t *req;
2062 struct p9_client *clnt;
2063
2064 p9_debug(P9_DEBUG_9P,
2065 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2066 fid->fid, name, (long long)attr_size, flags);
2067 err = 0;
2068 clnt = fid->clnt;
2069 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2070 fid->fid, name, attr_size, flags);
2071 if (IS_ERR(req)) {
2072 err = PTR_ERR(req);
2073 goto error;
2074 }
2075 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2076 p9_tag_remove(clnt, req);
2077 error:
2078 return err;
2079 }
2080 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2081
2082 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2083 {
2084 int err, rsize, non_zc = 0;
2085 struct p9_client *clnt;
2086 struct p9_req_t *req;
2087 char *dataptr;
2088 struct kvec kv = {.iov_base = data, .iov_len = count};
2089 struct iov_iter to;
2090
2091 iov_iter_kvec(&to, READ | ITER_KVEC, &kv, 1, count);
2092
2093 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2094 fid->fid, (unsigned long long) offset, count);
2095
2096 err = 0;
2097 clnt = fid->clnt;
2098
2099 rsize = fid->iounit;
2100 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2101 rsize = clnt->msize - P9_READDIRHDRSZ;
2102
2103 if (count < rsize)
2104 rsize = count;
2105
2106 /* Don't bother zerocopy for small IO (< 1024) */
2107 if (clnt->trans_mod->zc_request && rsize > 1024) {
2108 /*
2109 * response header len is 11
2110 * PDU Header(7) + IO Size (4)
2111 */
2112 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0,
2113 11, "dqd", fid->fid, offset, rsize);
2114 } else {
2115 non_zc = 1;
2116 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2117 offset, rsize);
2118 }
2119 if (IS_ERR(req)) {
2120 err = PTR_ERR(req);
2121 goto error;
2122 }
2123
2124 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr);
2125 if (err) {
2126 trace_9p_protocol_dump(clnt, &req->rc);
2127 goto free_and_error;
2128 }
2129 if (rsize < count) {
2130 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize);
2131 count = rsize;
2132 }
2133
2134 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2135
2136 if (non_zc)
2137 memmove(data, dataptr, count);
2138
2139 p9_tag_remove(clnt, req);
2140 return count;
2141
2142 free_and_error:
2143 p9_tag_remove(clnt, req);
2144 error:
2145 return err;
2146 }
2147 EXPORT_SYMBOL(p9_client_readdir);
2148
2149 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode,
2150 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2151 {
2152 int err;
2153 struct p9_client *clnt;
2154 struct p9_req_t *req;
2155
2156 err = 0;
2157 clnt = fid->clnt;
2158 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2159 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2160 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2161 MAJOR(rdev), MINOR(rdev), gid);
2162 if (IS_ERR(req))
2163 return PTR_ERR(req);
2164
2165 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
2166 if (err) {
2167 trace_9p_protocol_dump(clnt, &req->rc);
2168 goto error;
2169 }
2170 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2171 (unsigned long long)qid->path, qid->version);
2172
2173 error:
2174 p9_tag_remove(clnt, req);
2175 return err;
2176
2177 }
2178 EXPORT_SYMBOL(p9_client_mknod_dotl);
2179
2180 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode,
2181 kgid_t gid, struct p9_qid *qid)
2182 {
2183 int err;
2184 struct p9_client *clnt;
2185 struct p9_req_t *req;
2186
2187 err = 0;
2188 clnt = fid->clnt;
2189 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2190 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2191 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
2192 gid);
2193 if (IS_ERR(req))
2194 return PTR_ERR(req);
2195
2196 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
2197 if (err) {
2198 trace_9p_protocol_dump(clnt, &req->rc);
2199 goto error;
2200 }
2201 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2202 (unsigned long long)qid->path, qid->version);
2203
2204 error:
2205 p9_tag_remove(clnt, req);
2206 return err;
2207
2208 }
2209 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2210
2211 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2212 {
2213 int err;
2214 struct p9_client *clnt;
2215 struct p9_req_t *req;
2216
2217 err = 0;
2218 clnt = fid->clnt;
2219 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2220 "start %lld length %lld proc_id %d client_id %s\n",
2221 fid->fid, flock->type, flock->flags, flock->start,
2222 flock->length, flock->proc_id, flock->client_id);
2223
2224 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2225 flock->flags, flock->start, flock->length,
2226 flock->proc_id, flock->client_id);
2227
2228 if (IS_ERR(req))
2229 return PTR_ERR(req);
2230
2231 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status);
2232 if (err) {
2233 trace_9p_protocol_dump(clnt, &req->rc);
2234 goto error;
2235 }
2236 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2237 error:
2238 p9_tag_remove(clnt, req);
2239 return err;
2240
2241 }
2242 EXPORT_SYMBOL(p9_client_lock_dotl);
2243
2244 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2245 {
2246 int err;
2247 struct p9_client *clnt;
2248 struct p9_req_t *req;
2249
2250 err = 0;
2251 clnt = fid->clnt;
2252 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2253 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2254 glock->start, glock->length, glock->proc_id, glock->client_id);
2255
2256 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2257 glock->start, glock->length, glock->proc_id, glock->client_id);
2258
2259 if (IS_ERR(req))
2260 return PTR_ERR(req);
2261
2262 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type,
2263 &glock->start, &glock->length, &glock->proc_id,
2264 &glock->client_id);
2265 if (err) {
2266 trace_9p_protocol_dump(clnt, &req->rc);
2267 goto error;
2268 }
2269 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2270 "proc_id %d client_id %s\n", glock->type, glock->start,
2271 glock->length, glock->proc_id, glock->client_id);
2272 error:
2273 p9_tag_remove(clnt, req);
2274 return err;
2275 }
2276 EXPORT_SYMBOL(p9_client_getlock_dotl);
2277
2278 int p9_client_readlink(struct p9_fid *fid, char **target)
2279 {
2280 int err;
2281 struct p9_client *clnt;
2282 struct p9_req_t *req;
2283
2284 err = 0;
2285 clnt = fid->clnt;
2286 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2287
2288 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2289 if (IS_ERR(req))
2290 return PTR_ERR(req);
2291
2292 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target);
2293 if (err) {
2294 trace_9p_protocol_dump(clnt, &req->rc);
2295 goto error;
2296 }
2297 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2298 error:
2299 p9_tag_remove(clnt, req);
2300 return err;
2301 }
2302 EXPORT_SYMBOL(p9_client_readlink);
2303
2304 int __init p9_client_init(void)
2305 {
2306 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU);
2307 return p9_req_cache ? 0 : -ENOMEM;
2308 }
2309
2310 void __exit p9_client_exit(void)
2311 {
2312 kmem_cache_destroy(p9_req_cache);
2313 }
Linux with added FPC-III support