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perf bpf: Move perf_event_output() from stdio.h to bpf.h
[linux/fpc-iii.git] / net / 9p / client.c
blob2c9a17b9b46bb344897691d5f53c94a90e25c3c8
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 clnt->msize = option;
185 break;
186 case Opt_trans:
187 s = match_strdup(&args[0]);
188 if (!s) {
189 ret = -ENOMEM;
190 p9_debug(P9_DEBUG_ERROR,
191 "problem allocating copy of trans arg\n");
192 goto free_and_return;
193 }
194
195 v9fs_put_trans(clnt->trans_mod);
196 clnt->trans_mod = v9fs_get_trans_by_name(s);
197 if (clnt->trans_mod == NULL) {
198 pr_info("Could not find request transport: %s\n",
199 s);
200 ret = -EINVAL;
201 }
202 kfree(s);
203 break;
204 case Opt_legacy:
205 clnt->proto_version = p9_proto_legacy;
206 break;
207 case Opt_version:
208 s = match_strdup(&args[0]);
209 if (!s) {
210 ret = -ENOMEM;
211 p9_debug(P9_DEBUG_ERROR,
212 "problem allocating copy of version arg\n");
213 goto free_and_return;
214 }
215 r = get_protocol_version(s);
216 if (r < 0)
217 ret = r;
218 else
219 clnt->proto_version = r;
220 kfree(s);
221 break;
222 default:
223 continue;
224 }
225 }
226
227 free_and_return:
228 if (ret)
229 v9fs_put_trans(clnt->trans_mod);
230 kfree(tmp_options);
231 return ret;
232 }
233
234 static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc,
235 int alloc_msize)
236 {
237 if (likely(c->fcall_cache) && alloc_msize == c->msize) {
238 fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS);
239 fc->cache = c->fcall_cache;
240 } else {
241 fc->sdata = kmalloc(alloc_msize, GFP_NOFS);
242 fc->cache = NULL;
243 }
244 if (!fc->sdata)
245 return -ENOMEM;
246 fc->capacity = alloc_msize;
247 return 0;
248 }
249
250 void p9_fcall_fini(struct p9_fcall *fc)
251 {
252 /* sdata can be NULL for interrupted requests in trans_rdma,
253 * and kmem_cache_free does not do NULL-check for us
254 */
255 if (unlikely(!fc->sdata))
256 return;
257
258 if (fc->cache)
259 kmem_cache_free(fc->cache, fc->sdata);
260 else
261 kfree(fc->sdata);
262 }
263 EXPORT_SYMBOL(p9_fcall_fini);
264
265 static struct kmem_cache *p9_req_cache;
266
267 /**
268 * p9_req_alloc - Allocate a new request.
269 * @c: Client session.
270 * @type: Transaction type.
271 * @max_size: Maximum packet size for this request.
272 *
273 * Context: Process context.
274 * Return: Pointer to new request.
275 */
276 static struct p9_req_t *
277 p9_tag_alloc(struct p9_client *c, int8_t type, unsigned int max_size)
278 {
279 struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS);
280 int alloc_msize = min(c->msize, max_size);
281 int tag;
282
283 if (!req)
284 return ERR_PTR(-ENOMEM);
285
286 if (p9_fcall_init(c, &req->tc, alloc_msize))
287 goto free_req;
288 if (p9_fcall_init(c, &req->rc, alloc_msize))
289 goto free;
290
291 p9pdu_reset(&req->tc);
292 p9pdu_reset(&req->rc);
293 req->status = REQ_STATUS_ALLOC;
294 init_waitqueue_head(&req->wq);
295 INIT_LIST_HEAD(&req->req_list);
296
297 idr_preload(GFP_NOFS);
298 spin_lock_irq(&c->lock);
299 if (type == P9_TVERSION)
300 tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1,
301 GFP_NOWAIT);
302 else
303 tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT);
304 req->tc.tag = tag;
305 spin_unlock_irq(&c->lock);
306 idr_preload_end();
307 if (tag < 0)
308 goto free;
309
310 /* Init ref to two because in the general case there is one ref
311 * that is put asynchronously by a writer thread, one ref
312 * temporarily given by p9_tag_lookup and put by p9_client_cb
313 * in the recv thread, and one ref put by p9_tag_remove in the
314 * main thread. The only exception is virtio that does not use
315 * p9_tag_lookup but does not have a writer thread either
316 * (the write happens synchronously in the request/zc_request
317 * callback), so p9_client_cb eats the second ref there
318 * as the pointer is duplicated directly by virtqueue_add_sgs()
319 */
320 refcount_set(&req->refcount.refcount, 2);
321
322 return req;
323
324 free:
325 p9_fcall_fini(&req->tc);
326 p9_fcall_fini(&req->rc);
327 free_req:
328 kmem_cache_free(p9_req_cache, req);
329 return ERR_PTR(-ENOMEM);
330 }
331
332 /**
333 * p9_tag_lookup - Look up a request by tag.
334 * @c: Client session.
335 * @tag: Transaction ID.
336 *
337 * Context: Any context.
338 * Return: A request, or %NULL if there is no request with that tag.
339 */
340 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
341 {
342 struct p9_req_t *req;
343
344 rcu_read_lock();
345 again:
346 req = idr_find(&c->reqs, tag);
347 if (req) {
348 /* We have to be careful with the req found under rcu_read_lock
349 * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the
350 * ref again without corrupting other data, then check again
351 * that the tag matches once we have the ref
352 */
353 if (!p9_req_try_get(req))
354 goto again;
355 if (req->tc.tag != tag) {
356 p9_req_put(req);
357 goto again;
358 }
359 }
360 rcu_read_unlock();
361
362 return req;
363 }
364 EXPORT_SYMBOL(p9_tag_lookup);
365
366 /**
367 * p9_tag_remove - Remove a tag.
368 * @c: Client session.
369 * @r: Request of reference.
370 *
371 * Context: Any context.
372 */
373 static int p9_tag_remove(struct p9_client *c, struct p9_req_t *r)
374 {
375 unsigned long flags;
376 u16 tag = r->tc.tag;
377
378 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
379 spin_lock_irqsave(&c->lock, flags);
380 idr_remove(&c->reqs, tag);
381 spin_unlock_irqrestore(&c->lock, flags);
382 return p9_req_put(r);
383 }
384
385 static void p9_req_free(struct kref *ref)
386 {
387 struct p9_req_t *r = container_of(ref, struct p9_req_t, refcount);
388 p9_fcall_fini(&r->tc);
389 p9_fcall_fini(&r->rc);
390 kmem_cache_free(p9_req_cache, r);
391 }
392
393 int p9_req_put(struct p9_req_t *r)
394 {
395 return kref_put(&r->refcount, p9_req_free);
396 }
397 EXPORT_SYMBOL(p9_req_put);
398
399 /**
400 * p9_tag_cleanup - cleans up tags structure and reclaims resources
401 * @c: v9fs client struct
402 *
403 * This frees resources associated with the tags structure
404 *
405 */
406 static void p9_tag_cleanup(struct p9_client *c)
407 {
408 struct p9_req_t *req;
409 int id;
410
411 rcu_read_lock();
412 idr_for_each_entry(&c->reqs, req, id) {
413 pr_info("Tag %d still in use\n", id);
414 if (p9_tag_remove(c, req) == 0)
415 pr_warn("Packet with tag %d has still references",
416 req->tc.tag);
417 }
418 rcu_read_unlock();
419 }
420
421 /**
422 * p9_client_cb - call back from transport to client
423 * c: client state
424 * req: request received
425 *
426 */
427 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
428 {
429 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag);
430
431 /*
432 * This barrier is needed to make sure any change made to req before
433 * the status change is visible to another thread
434 */
435 smp_wmb();
436 req->status = status;
437
438 wake_up(&req->wq);
439 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag);
440 p9_req_put(req);
441 }
442 EXPORT_SYMBOL(p9_client_cb);
443
444 /**
445 * p9_parse_header - parse header arguments out of a packet
446 * @pdu: packet to parse
447 * @size: size of packet
448 * @type: type of request
449 * @tag: tag of packet
450 * @rewind: set if we need to rewind offset afterwards
451 */
452
453 int
454 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
455 int rewind)
456 {
457 int8_t r_type;
458 int16_t r_tag;
459 int32_t r_size;
460 int offset = pdu->offset;
461 int err;
462
463 pdu->offset = 0;
464
465 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
466 if (err)
467 goto rewind_and_exit;
468
469 if (type)
470 *type = r_type;
471 if (tag)
472 *tag = r_tag;
473 if (size)
474 *size = r_size;
475
476 if (pdu->size != r_size || r_size < 7) {
477 err = -EINVAL;
478 goto rewind_and_exit;
479 }
480
481 pdu->id = r_type;
482 pdu->tag = r_tag;
483
484 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
485 pdu->size, pdu->id, pdu->tag);
486
487 rewind_and_exit:
488 if (rewind)
489 pdu->offset = offset;
490 return err;
491 }
492 EXPORT_SYMBOL(p9_parse_header);
493
494 /**
495 * p9_check_errors - check 9p packet for error return and process it
496 * @c: current client instance
497 * @req: request to parse and check for error conditions
498 *
499 * returns error code if one is discovered, otherwise returns 0
500 *
501 * this will have to be more complicated if we have multiple
502 * error packet types
503 */
504
505 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
506 {
507 int8_t type;
508 int err;
509 int ecode;
510
511 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0);
512 if (req->rc.size >= c->msize) {
513 p9_debug(P9_DEBUG_ERROR,
514 "requested packet size too big: %d\n",
515 req->rc.size);
516 return -EIO;
517 }
518 /*
519 * dump the response from server
520 * This should be after check errors which poplulate pdu_fcall.
521 */
522 trace_9p_protocol_dump(c, &req->rc);
523 if (err) {
524 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
525 return err;
526 }
527 if (type != P9_RERROR && type != P9_RLERROR)
528 return 0;
529
530 if (!p9_is_proto_dotl(c)) {
531 char *ename;
532 err = p9pdu_readf(&req->rc, c->proto_version, "s?d",
533 &ename, &ecode);
534 if (err)
535 goto out_err;
536
537 if (p9_is_proto_dotu(c) && ecode < 512)
538 err = -ecode;
539
540 if (!err) {
541 err = p9_errstr2errno(ename, strlen(ename));
542
543 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
544 -ecode, ename);
545 }
546 kfree(ename);
547 } else {
548 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode);
549 err = -ecode;
550
551 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
552 }
553
554 return err;
555
556 out_err:
557 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
558
559 return err;
560 }
561
562 /**
563 * p9_check_zc_errors - check 9p packet for error return and process it
564 * @c: current client instance
565 * @req: request to parse and check for error conditions
566 * @in_hdrlen: Size of response protocol buffer.
567 *
568 * returns error code if one is discovered, otherwise returns 0
569 *
570 * this will have to be more complicated if we have multiple
571 * error packet types
572 */
573
574 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
575 struct iov_iter *uidata, int in_hdrlen)
576 {
577 int err;
578 int ecode;
579 int8_t type;
580 char *ename = NULL;
581
582 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0);
583 /*
584 * dump the response from server
585 * This should be after parse_header which poplulate pdu_fcall.
586 */
587 trace_9p_protocol_dump(c, &req->rc);
588 if (err) {
589 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
590 return err;
591 }
592
593 if (type != P9_RERROR && type != P9_RLERROR)
594 return 0;
595
596 if (!p9_is_proto_dotl(c)) {
597 /* Error is reported in string format */
598 int len;
599 /* 7 = header size for RERROR; */
600 int inline_len = in_hdrlen - 7;
601
602 len = req->rc.size - req->rc.offset;
603 if (len > (P9_ZC_HDR_SZ - 7)) {
604 err = -EFAULT;
605 goto out_err;
606 }
607
608 ename = &req->rc.sdata[req->rc.offset];
609 if (len > inline_len) {
610 /* We have error in external buffer */
611 if (!copy_from_iter_full(ename + inline_len,
612 len - inline_len, uidata)) {
613 err = -EFAULT;
614 goto out_err;
615 }
616 }
617 ename = NULL;
618 err = p9pdu_readf(&req->rc, c->proto_version, "s?d",
619 &ename, &ecode);
620 if (err)
621 goto out_err;
622
623 if (p9_is_proto_dotu(c) && ecode < 512)
624 err = -ecode;
625
626 if (!err) {
627 err = p9_errstr2errno(ename, strlen(ename));
628
629 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
630 -ecode, ename);
631 }
632 kfree(ename);
633 } else {
634 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode);
635 err = -ecode;
636
637 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
638 }
639 return err;
640
641 out_err:
642 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
643 return err;
644 }
645
646 static struct p9_req_t *
647 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
648
649 /**
650 * p9_client_flush - flush (cancel) a request
651 * @c: client state
652 * @oldreq: request to cancel
653 *
654 * This sents a flush for a particular request and links
655 * the flush request to the original request. The current
656 * code only supports a single flush request although the protocol
657 * allows for multiple flush requests to be sent for a single request.
658 *
659 */
660
661 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
662 {
663 struct p9_req_t *req;
664 int16_t oldtag;
665 int err;
666
667 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1);
668 if (err)
669 return err;
670
671 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
672
673 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
674 if (IS_ERR(req))
675 return PTR_ERR(req);
676
677 /*
678 * if we haven't received a response for oldreq,
679 * remove it from the list
680 */
681 if (oldreq->status == REQ_STATUS_SENT) {
682 if (c->trans_mod->cancelled)
683 c->trans_mod->cancelled(c, oldreq);
684 }
685
686 p9_tag_remove(c, req);
687 return 0;
688 }
689
690 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
691 int8_t type, int req_size,
692 const char *fmt, va_list ap)
693 {
694 int err;
695 struct p9_req_t *req;
696
697 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
698
699 /* we allow for any status other than disconnected */
700 if (c->status == Disconnected)
701 return ERR_PTR(-EIO);
702
703 /* if status is begin_disconnected we allow only clunk request */
704 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
705 return ERR_PTR(-EIO);
706
707 req = p9_tag_alloc(c, type, req_size);
708 if (IS_ERR(req))
709 return req;
710
711 /* marshall the data */
712 p9pdu_prepare(&req->tc, req->tc.tag, type);
713 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap);
714 if (err)
715 goto reterr;
716 p9pdu_finalize(c, &req->tc);
717 trace_9p_client_req(c, type, req->tc.tag);
718 return req;
719 reterr:
720 p9_tag_remove(c, req);
721 /* We have to put also the 2nd reference as it won't be used */
722 p9_req_put(req);
723 return ERR_PTR(err);
724 }
725
726 /**
727 * p9_client_rpc - issue a request and wait for a response
728 * @c: client session
729 * @type: type of request
730 * @fmt: protocol format string (see protocol.c)
731 *
732 * Returns request structure (which client must free using p9_tag_remove)
733 */
734
735 static struct p9_req_t *
736 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
737 {
738 va_list ap;
739 int sigpending, err;
740 unsigned long flags;
741 struct p9_req_t *req;
742
743 va_start(ap, fmt);
744 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
745 va_end(ap);
746 if (IS_ERR(req))
747 return req;
748
749 if (signal_pending(current)) {
750 sigpending = 1;
751 clear_thread_flag(TIF_SIGPENDING);
752 } else
753 sigpending = 0;
754
755 err = c->trans_mod->request(c, req);
756 if (err < 0) {
757 /* write won't happen */
758 p9_req_put(req);
759 if (err != -ERESTARTSYS && err != -EFAULT)
760 c->status = Disconnected;
761 goto recalc_sigpending;
762 }
763 again:
764 /* Wait for the response */
765 err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD);
766
767 /*
768 * Make sure our req is coherent with regard to updates in other
769 * threads - echoes to wmb() in the callback
770 */
771 smp_rmb();
772
773 if ((err == -ERESTARTSYS) && (c->status == Connected)
774 && (type == P9_TFLUSH)) {
775 sigpending = 1;
776 clear_thread_flag(TIF_SIGPENDING);
777 goto again;
778 }
779
780 if (req->status == REQ_STATUS_ERROR) {
781 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
782 err = req->t_err;
783 }
784 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
785 p9_debug(P9_DEBUG_MUX, "flushing\n");
786 sigpending = 1;
787 clear_thread_flag(TIF_SIGPENDING);
788
789 if (c->trans_mod->cancel(c, req))
790 p9_client_flush(c, req);
791
792 /* if we received the response anyway, don't signal error */
793 if (req->status == REQ_STATUS_RCVD)
794 err = 0;
795 }
796 recalc_sigpending:
797 if (sigpending) {
798 spin_lock_irqsave(&current->sighand->siglock, flags);
799 recalc_sigpending();
800 spin_unlock_irqrestore(&current->sighand->siglock, flags);
801 }
802 if (err < 0)
803 goto reterr;
804
805 err = p9_check_errors(c, req);
806 trace_9p_client_res(c, type, req->rc.tag, err);
807 if (!err)
808 return req;
809 reterr:
810 p9_tag_remove(c, req);
811 return ERR_PTR(safe_errno(err));
812 }
813
814 /**
815 * p9_client_zc_rpc - issue a request and wait for a response
816 * @c: client session
817 * @type: type of request
818 * @uidata: destination for zero copy read
819 * @uodata: source for zero copy write
820 * @inlen: read buffer size
821 * @olen: write buffer size
822 * @hdrlen: reader header size, This is the size of response protocol data
823 * @fmt: protocol format string (see protocol.c)
824 *
825 * Returns request structure (which client must free using p9_tag_remove)
826 */
827 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
828 struct iov_iter *uidata,
829 struct iov_iter *uodata,
830 int inlen, int olen, int in_hdrlen,
831 const char *fmt, ...)
832 {
833 va_list ap;
834 int sigpending, err;
835 unsigned long flags;
836 struct p9_req_t *req;
837
838 va_start(ap, fmt);
839 /*
840 * We allocate a inline protocol data of only 4k bytes.
841 * The actual content is passed in zero-copy fashion.
842 */
843 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
844 va_end(ap);
845 if (IS_ERR(req))
846 return req;
847
848 if (signal_pending(current)) {
849 sigpending = 1;
850 clear_thread_flag(TIF_SIGPENDING);
851 } else
852 sigpending = 0;
853
854 err = c->trans_mod->zc_request(c, req, uidata, uodata,
855 inlen, olen, in_hdrlen);
856 if (err < 0) {
857 if (err == -EIO)
858 c->status = Disconnected;
859 if (err != -ERESTARTSYS)
860 goto recalc_sigpending;
861 }
862 if (req->status == REQ_STATUS_ERROR) {
863 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
864 err = req->t_err;
865 }
866 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
867 p9_debug(P9_DEBUG_MUX, "flushing\n");
868 sigpending = 1;
869 clear_thread_flag(TIF_SIGPENDING);
870
871 if (c->trans_mod->cancel(c, req))
872 p9_client_flush(c, req);
873
874 /* if we received the response anyway, don't signal error */
875 if (req->status == REQ_STATUS_RCVD)
876 err = 0;
877 }
878 recalc_sigpending:
879 if (sigpending) {
880 spin_lock_irqsave(&current->sighand->siglock, flags);
881 recalc_sigpending();
882 spin_unlock_irqrestore(&current->sighand->siglock, flags);
883 }
884 if (err < 0)
885 goto reterr;
886
887 err = p9_check_zc_errors(c, req, uidata, in_hdrlen);
888 trace_9p_client_res(c, type, req->rc.tag, err);
889 if (!err)
890 return req;
891 reterr:
892 p9_tag_remove(c, req);
893 return ERR_PTR(safe_errno(err));
894 }
895
896 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
897 {
898 int ret;
899 struct p9_fid *fid;
900
901 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
902 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
903 if (!fid)
904 return NULL;
905
906 memset(&fid->qid, 0, sizeof(struct p9_qid));
907 fid->mode = -1;
908 fid->uid = current_fsuid();
909 fid->clnt = clnt;
910 fid->rdir = NULL;
911 fid->fid = 0;
912
913 idr_preload(GFP_KERNEL);
914 spin_lock_irq(&clnt->lock);
915 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1,
916 GFP_NOWAIT);
917 spin_unlock_irq(&clnt->lock);
918 idr_preload_end();
919
920 if (!ret)
921 return fid;
922
923 kfree(fid);
924 return NULL;
925 }
926
927 static void p9_fid_destroy(struct p9_fid *fid)
928 {
929 struct p9_client *clnt;
930 unsigned long flags;
931
932 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
933 clnt = fid->clnt;
934 spin_lock_irqsave(&clnt->lock, flags);
935 idr_remove(&clnt->fids, fid->fid);
936 spin_unlock_irqrestore(&clnt->lock, flags);
937 kfree(fid->rdir);
938 kfree(fid);
939 }
940
941 static int p9_client_version(struct p9_client *c)
942 {
943 int err = 0;
944 struct p9_req_t *req;
945 char *version = NULL;
946 int msize;
947
948 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
949 c->msize, c->proto_version);
950
951 switch (c->proto_version) {
952 case p9_proto_2000L:
953 req = p9_client_rpc(c, P9_TVERSION, "ds",
954 c->msize, "9P2000.L");
955 break;
956 case p9_proto_2000u:
957 req = p9_client_rpc(c, P9_TVERSION, "ds",
958 c->msize, "9P2000.u");
959 break;
960 case p9_proto_legacy:
961 req = p9_client_rpc(c, P9_TVERSION, "ds",
962 c->msize, "9P2000");
963 break;
964 default:
965 return -EINVAL;
966 }
967
968 if (IS_ERR(req))
969 return PTR_ERR(req);
970
971 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version);
972 if (err) {
973 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
974 trace_9p_protocol_dump(c, &req->rc);
975 goto error;
976 }
977
978 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
979 if (!strncmp(version, "9P2000.L", 8))
980 c->proto_version = p9_proto_2000L;
981 else if (!strncmp(version, "9P2000.u", 8))
982 c->proto_version = p9_proto_2000u;
983 else if (!strncmp(version, "9P2000", 6))
984 c->proto_version = p9_proto_legacy;
985 else {
986 err = -EREMOTEIO;
987 goto error;
988 }
989
990 if (msize < c->msize)
991 c->msize = msize;
992
993 error:
994 kfree(version);
995 p9_tag_remove(c, req);
996
997 return err;
998 }
999
1000 struct p9_client *p9_client_create(const char *dev_name, char *options)
1001 {
1002 int err;
1003 struct p9_client *clnt;
1004 char *client_id;
1005
1006 err = 0;
1007 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
1008 if (!clnt)
1009 return ERR_PTR(-ENOMEM);
1010
1011 clnt->trans_mod = NULL;
1012 clnt->trans = NULL;
1013 clnt->fcall_cache = NULL;
1014
1015 client_id = utsname()->nodename;
1016 memcpy(clnt->name, client_id, strlen(client_id) + 1);
1017
1018 spin_lock_init(&clnt->lock);
1019 idr_init(&clnt->fids);
1020 idr_init(&clnt->reqs);
1021
1022 err = parse_opts(options, clnt);
1023 if (err < 0)
1024 goto free_client;
1025
1026 if (!clnt->trans_mod)
1027 clnt->trans_mod = v9fs_get_default_trans();
1028
1029 if (clnt->trans_mod == NULL) {
1030 err = -EPROTONOSUPPORT;
1031 p9_debug(P9_DEBUG_ERROR,
1032 "No transport defined or default transport\n");
1033 goto free_client;
1034 }
1035
1036 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1037 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1038
1039 err = clnt->trans_mod->create(clnt, dev_name, options);
1040 if (err)
1041 goto put_trans;
1042
1043 if (clnt->msize > clnt->trans_mod->maxsize)
1044 clnt->msize = clnt->trans_mod->maxsize;
1045
1046 err = p9_client_version(clnt);
1047 if (err)
1048 goto close_trans;
1049
1050 /* P9_HDRSZ + 4 is the smallest packet header we can have that is
1051 * followed by data accessed from userspace by read
1052 */
1053 clnt->fcall_cache =
1054 kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize,
1055 0, 0, P9_HDRSZ + 4,
1056 clnt->msize - (P9_HDRSZ + 4),
1057 NULL);
1058
1059 return clnt;
1060
1061 close_trans:
1062 clnt->trans_mod->close(clnt);
1063 put_trans:
1064 v9fs_put_trans(clnt->trans_mod);
1065 free_client:
1066 kfree(clnt);
1067 return ERR_PTR(err);
1068 }
1069 EXPORT_SYMBOL(p9_client_create);
1070
1071 void p9_client_destroy(struct p9_client *clnt)
1072 {
1073 struct p9_fid *fid;
1074 int id;
1075
1076 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1077
1078 if (clnt->trans_mod)
1079 clnt->trans_mod->close(clnt);
1080
1081 v9fs_put_trans(clnt->trans_mod);
1082
1083 idr_for_each_entry(&clnt->fids, fid, id) {
1084 pr_info("Found fid %d not clunked\n", fid->fid);
1085 p9_fid_destroy(fid);
1086 }
1087
1088 p9_tag_cleanup(clnt);
1089
1090 kmem_cache_destroy(clnt->fcall_cache);
1091 kfree(clnt);
1092 }
1093 EXPORT_SYMBOL(p9_client_destroy);
1094
1095 void p9_client_disconnect(struct p9_client *clnt)
1096 {
1097 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1098 clnt->status = Disconnected;
1099 }
1100 EXPORT_SYMBOL(p9_client_disconnect);
1101
1102 void p9_client_begin_disconnect(struct p9_client *clnt)
1103 {
1104 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1105 clnt->status = BeginDisconnect;
1106 }
1107 EXPORT_SYMBOL(p9_client_begin_disconnect);
1108
1109 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1110 const char *uname, kuid_t n_uname, const char *aname)
1111 {
1112 int err = 0;
1113 struct p9_req_t *req;
1114 struct p9_fid *fid;
1115 struct p9_qid qid;
1116
1117
1118 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1119 afid ? afid->fid : -1, uname, aname);
1120 fid = p9_fid_create(clnt);
1121 if (!fid) {
1122 err = -ENOMEM;
1123 goto error;
1124 }
1125 fid->uid = n_uname;
1126
1127 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1128 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1129 if (IS_ERR(req)) {
1130 err = PTR_ERR(req);
1131 goto error;
1132 }
1133
1134 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid);
1135 if (err) {
1136 trace_9p_protocol_dump(clnt, &req->rc);
1137 p9_tag_remove(clnt, req);
1138 goto error;
1139 }
1140
1141 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1142 qid.type, (unsigned long long)qid.path, qid.version);
1143
1144 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1145
1146 p9_tag_remove(clnt, req);
1147 return fid;
1148
1149 error:
1150 if (fid)
1151 p9_fid_destroy(fid);
1152 return ERR_PTR(err);
1153 }
1154 EXPORT_SYMBOL(p9_client_attach);
1155
1156 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1157 const unsigned char * const *wnames, int clone)
1158 {
1159 int err;
1160 struct p9_client *clnt;
1161 struct p9_fid *fid;
1162 struct p9_qid *wqids;
1163 struct p9_req_t *req;
1164 uint16_t nwqids, count;
1165
1166 err = 0;
1167 wqids = NULL;
1168 clnt = oldfid->clnt;
1169 if (clone) {
1170 fid = p9_fid_create(clnt);
1171 if (!fid) {
1172 err = -ENOMEM;
1173 goto error;
1174 }
1175
1176 fid->uid = oldfid->uid;
1177 } else
1178 fid = oldfid;
1179
1180
1181 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1182 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1183
1184 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1185 nwname, wnames);
1186 if (IS_ERR(req)) {
1187 err = PTR_ERR(req);
1188 goto error;
1189 }
1190
1191 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1192 if (err) {
1193 trace_9p_protocol_dump(clnt, &req->rc);
1194 p9_tag_remove(clnt, req);
1195 goto clunk_fid;
1196 }
1197 p9_tag_remove(clnt, req);
1198
1199 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1200
1201 if (nwqids != nwname) {
1202 err = -ENOENT;
1203 goto clunk_fid;
1204 }
1205
1206 for (count = 0; count < nwqids; count++)
1207 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1208 count, wqids[count].type,
1209 (unsigned long long)wqids[count].path,
1210 wqids[count].version);
1211
1212 if (nwname)
1213 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1214 else
1215 fid->qid = oldfid->qid;
1216
1217 kfree(wqids);
1218 return fid;
1219
1220 clunk_fid:
1221 kfree(wqids);
1222 p9_client_clunk(fid);
1223 fid = NULL;
1224
1225 error:
1226 if (fid && (fid != oldfid))
1227 p9_fid_destroy(fid);
1228
1229 return ERR_PTR(err);
1230 }
1231 EXPORT_SYMBOL(p9_client_walk);
1232
1233 int p9_client_open(struct p9_fid *fid, int mode)
1234 {
1235 int err;
1236 struct p9_client *clnt;
1237 struct p9_req_t *req;
1238 struct p9_qid qid;
1239 int iounit;
1240
1241 clnt = fid->clnt;
1242 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1243 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1244 err = 0;
1245
1246 if (fid->mode != -1)
1247 return -EINVAL;
1248
1249 if (p9_is_proto_dotl(clnt))
1250 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1251 else
1252 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1253 if (IS_ERR(req)) {
1254 err = PTR_ERR(req);
1255 goto error;
1256 }
1257
1258 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1259 if (err) {
1260 trace_9p_protocol_dump(clnt, &req->rc);
1261 goto free_and_error;
1262 }
1263
1264 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1265 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1266 (unsigned long long)qid.path, qid.version, iounit);
1267
1268 fid->mode = mode;
1269 fid->iounit = iounit;
1270
1271 free_and_error:
1272 p9_tag_remove(clnt, req);
1273 error:
1274 return err;
1275 }
1276 EXPORT_SYMBOL(p9_client_open);
1277
1278 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode,
1279 kgid_t gid, struct p9_qid *qid)
1280 {
1281 int err = 0;
1282 struct p9_client *clnt;
1283 struct p9_req_t *req;
1284 int iounit;
1285
1286 p9_debug(P9_DEBUG_9P,
1287 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1288 ofid->fid, name, flags, mode,
1289 from_kgid(&init_user_ns, gid));
1290 clnt = ofid->clnt;
1291
1292 if (ofid->mode != -1)
1293 return -EINVAL;
1294
1295 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1296 mode, gid);
1297 if (IS_ERR(req)) {
1298 err = PTR_ERR(req);
1299 goto error;
1300 }
1301
1302 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit);
1303 if (err) {
1304 trace_9p_protocol_dump(clnt, &req->rc);
1305 goto free_and_error;
1306 }
1307
1308 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1309 qid->type,
1310 (unsigned long long)qid->path,
1311 qid->version, iounit);
1312
1313 ofid->mode = mode;
1314 ofid->iounit = iounit;
1315
1316 free_and_error:
1317 p9_tag_remove(clnt, req);
1318 error:
1319 return err;
1320 }
1321 EXPORT_SYMBOL(p9_client_create_dotl);
1322
1323 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode,
1324 char *extension)
1325 {
1326 int err;
1327 struct p9_client *clnt;
1328 struct p9_req_t *req;
1329 struct p9_qid qid;
1330 int iounit;
1331
1332 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1333 fid->fid, name, perm, mode);
1334 err = 0;
1335 clnt = fid->clnt;
1336
1337 if (fid->mode != -1)
1338 return -EINVAL;
1339
1340 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1341 mode, extension);
1342 if (IS_ERR(req)) {
1343 err = PTR_ERR(req);
1344 goto error;
1345 }
1346
1347 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1348 if (err) {
1349 trace_9p_protocol_dump(clnt, &req->rc);
1350 goto free_and_error;
1351 }
1352
1353 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1354 qid.type,
1355 (unsigned long long)qid.path,
1356 qid.version, iounit);
1357
1358 fid->mode = mode;
1359 fid->iounit = iounit;
1360
1361 free_and_error:
1362 p9_tag_remove(clnt, req);
1363 error:
1364 return err;
1365 }
1366 EXPORT_SYMBOL(p9_client_fcreate);
1367
1368 int p9_client_symlink(struct p9_fid *dfid, const char *name,
1369 const char *symtgt, kgid_t gid, struct p9_qid *qid)
1370 {
1371 int err = 0;
1372 struct p9_client *clnt;
1373 struct p9_req_t *req;
1374
1375 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1376 dfid->fid, name, symtgt);
1377 clnt = dfid->clnt;
1378
1379 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1380 gid);
1381 if (IS_ERR(req)) {
1382 err = PTR_ERR(req);
1383 goto error;
1384 }
1385
1386 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
1387 if (err) {
1388 trace_9p_protocol_dump(clnt, &req->rc);
1389 goto free_and_error;
1390 }
1391
1392 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1393 qid->type, (unsigned long long)qid->path, qid->version);
1394
1395 free_and_error:
1396 p9_tag_remove(clnt, req);
1397 error:
1398 return err;
1399 }
1400 EXPORT_SYMBOL(p9_client_symlink);
1401
1402 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname)
1403 {
1404 struct p9_client *clnt;
1405 struct p9_req_t *req;
1406
1407 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1408 dfid->fid, oldfid->fid, newname);
1409 clnt = dfid->clnt;
1410 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1411 newname);
1412 if (IS_ERR(req))
1413 return PTR_ERR(req);
1414
1415 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1416 p9_tag_remove(clnt, req);
1417 return 0;
1418 }
1419 EXPORT_SYMBOL(p9_client_link);
1420
1421 int p9_client_fsync(struct p9_fid *fid, int datasync)
1422 {
1423 int err;
1424 struct p9_client *clnt;
1425 struct p9_req_t *req;
1426
1427 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1428 fid->fid, datasync);
1429 err = 0;
1430 clnt = fid->clnt;
1431
1432 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1433 if (IS_ERR(req)) {
1434 err = PTR_ERR(req);
1435 goto error;
1436 }
1437
1438 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1439
1440 p9_tag_remove(clnt, req);
1441
1442 error:
1443 return err;
1444 }
1445 EXPORT_SYMBOL(p9_client_fsync);
1446
1447 int p9_client_clunk(struct p9_fid *fid)
1448 {
1449 int err;
1450 struct p9_client *clnt;
1451 struct p9_req_t *req;
1452 int retries = 0;
1453
1454 if (!fid) {
1455 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1456 __func__, task_pid_nr(current));
1457 dump_stack();
1458 return 0;
1459 }
1460
1461 again:
1462 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1463 retries);
1464 err = 0;
1465 clnt = fid->clnt;
1466
1467 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1468 if (IS_ERR(req)) {
1469 err = PTR_ERR(req);
1470 goto error;
1471 }
1472
1473 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1474
1475 p9_tag_remove(clnt, req);
1476 error:
1477 /*
1478 * Fid is not valid even after a failed clunk
1479 * If interrupted, retry once then give up and
1480 * leak fid until umount.
1481 */
1482 if (err == -ERESTARTSYS) {
1483 if (retries++ == 0)
1484 goto again;
1485 } else
1486 p9_fid_destroy(fid);
1487 return err;
1488 }
1489 EXPORT_SYMBOL(p9_client_clunk);
1490
1491 int p9_client_remove(struct p9_fid *fid)
1492 {
1493 int err;
1494 struct p9_client *clnt;
1495 struct p9_req_t *req;
1496
1497 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1498 err = 0;
1499 clnt = fid->clnt;
1500
1501 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1502 if (IS_ERR(req)) {
1503 err = PTR_ERR(req);
1504 goto error;
1505 }
1506
1507 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1508
1509 p9_tag_remove(clnt, req);
1510 error:
1511 if (err == -ERESTARTSYS)
1512 p9_client_clunk(fid);
1513 else
1514 p9_fid_destroy(fid);
1515 return err;
1516 }
1517 EXPORT_SYMBOL(p9_client_remove);
1518
1519 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1520 {
1521 int err = 0;
1522 struct p9_req_t *req;
1523 struct p9_client *clnt;
1524
1525 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1526 dfid->fid, name, flags);
1527
1528 clnt = dfid->clnt;
1529 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1530 if (IS_ERR(req)) {
1531 err = PTR_ERR(req);
1532 goto error;
1533 }
1534 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1535
1536 p9_tag_remove(clnt, req);
1537 error:
1538 return err;
1539 }
1540 EXPORT_SYMBOL(p9_client_unlinkat);
1541
1542 int
1543 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
1544 {
1545 struct p9_client *clnt = fid->clnt;
1546 struct p9_req_t *req;
1547 int total = 0;
1548 *err = 0;
1549
1550 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1551 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to));
1552
1553 while (iov_iter_count(to)) {
1554 int count = iov_iter_count(to);
1555 int rsize, non_zc = 0;
1556 char *dataptr;
1557
1558 rsize = fid->iounit;
1559 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1560 rsize = clnt->msize - P9_IOHDRSZ;
1561
1562 if (count < rsize)
1563 rsize = count;
1564
1565 /* Don't bother zerocopy for small IO (< 1024) */
1566 if (clnt->trans_mod->zc_request && rsize > 1024) {
1567 /*
1568 * response header len is 11
1569 * PDU Header(7) + IO Size (4)
1570 */
1571 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize,
1572 0, 11, "dqd", fid->fid,
1573 offset, rsize);
1574 } else {
1575 non_zc = 1;
1576 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1577 rsize);
1578 }
1579 if (IS_ERR(req)) {
1580 *err = PTR_ERR(req);
1581 break;
1582 }
1583
1584 *err = p9pdu_readf(&req->rc, clnt->proto_version,
1585 "D", &count, &dataptr);
1586 if (*err) {
1587 trace_9p_protocol_dump(clnt, &req->rc);
1588 p9_tag_remove(clnt, req);
1589 break;
1590 }
1591 if (rsize < count) {
1592 pr_err("bogus RREAD count (%d > %d)\n", count, rsize);
1593 count = rsize;
1594 }
1595
1596 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1597 if (!count) {
1598 p9_tag_remove(clnt, req);
1599 break;
1600 }
1601
1602 if (non_zc) {
1603 int n = copy_to_iter(dataptr, count, to);
1604 total += n;
1605 offset += n;
1606 if (n != count) {
1607 *err = -EFAULT;
1608 p9_tag_remove(clnt, req);
1609 break;
1610 }
1611 } else {
1612 iov_iter_advance(to, count);
1613 total += count;
1614 offset += count;
1615 }
1616 p9_tag_remove(clnt, req);
1617 }
1618 return total;
1619 }
1620 EXPORT_SYMBOL(p9_client_read);
1621
1622 int
1623 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
1624 {
1625 struct p9_client *clnt = fid->clnt;
1626 struct p9_req_t *req;
1627 int total = 0;
1628 *err = 0;
1629
1630 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n",
1631 fid->fid, (unsigned long long) offset,
1632 iov_iter_count(from));
1633
1634 while (iov_iter_count(from)) {
1635 int count = iov_iter_count(from);
1636 int rsize = fid->iounit;
1637 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1638 rsize = clnt->msize - P9_IOHDRSZ;
1639
1640 if (count < rsize)
1641 rsize = count;
1642
1643 /* Don't bother zerocopy for small IO (< 1024) */
1644 if (clnt->trans_mod->zc_request && rsize > 1024) {
1645 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
1646 rsize, P9_ZC_HDR_SZ, "dqd",
1647 fid->fid, offset, rsize);
1648 } else {
1649 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
1650 offset, rsize, from);
1651 }
1652 if (IS_ERR(req)) {
1653 *err = PTR_ERR(req);
1654 break;
1655 }
1656
1657 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &count);
1658 if (*err) {
1659 trace_9p_protocol_dump(clnt, &req->rc);
1660 p9_tag_remove(clnt, req);
1661 break;
1662 }
1663 if (rsize < count) {
1664 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize);
1665 count = rsize;
1666 }
1667
1668 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1669
1670 p9_tag_remove(clnt, req);
1671 iov_iter_advance(from, count);
1672 total += count;
1673 offset += count;
1674 }
1675 return total;
1676 }
1677 EXPORT_SYMBOL(p9_client_write);
1678
1679 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1680 {
1681 int err;
1682 struct p9_client *clnt;
1683 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1684 struct p9_req_t *req;
1685 u16 ignored;
1686
1687 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1688
1689 if (!ret)
1690 return ERR_PTR(-ENOMEM);
1691
1692 err = 0;
1693 clnt = fid->clnt;
1694
1695 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1696 if (IS_ERR(req)) {
1697 err = PTR_ERR(req);
1698 goto error;
1699 }
1700
1701 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret);
1702 if (err) {
1703 trace_9p_protocol_dump(clnt, &req->rc);
1704 p9_tag_remove(clnt, req);
1705 goto error;
1706 }
1707
1708 p9_debug(P9_DEBUG_9P,
1709 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1710 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1711 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1712 "<<< uid=%d gid=%d n_muid=%d\n",
1713 ret->size, ret->type, ret->dev, ret->qid.type,
1714 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1715 ret->atime, ret->mtime, (unsigned long long)ret->length,
1716 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1717 from_kuid(&init_user_ns, ret->n_uid),
1718 from_kgid(&init_user_ns, ret->n_gid),
1719 from_kuid(&init_user_ns, ret->n_muid));
1720
1721 p9_tag_remove(clnt, req);
1722 return ret;
1723
1724 error:
1725 kfree(ret);
1726 return ERR_PTR(err);
1727 }
1728 EXPORT_SYMBOL(p9_client_stat);
1729
1730 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1731 u64 request_mask)
1732 {
1733 int err;
1734 struct p9_client *clnt;
1735 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1736 GFP_KERNEL);
1737 struct p9_req_t *req;
1738
1739 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1740 fid->fid, request_mask);
1741
1742 if (!ret)
1743 return ERR_PTR(-ENOMEM);
1744
1745 err = 0;
1746 clnt = fid->clnt;
1747
1748 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1749 if (IS_ERR(req)) {
1750 err = PTR_ERR(req);
1751 goto error;
1752 }
1753
1754 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret);
1755 if (err) {
1756 trace_9p_protocol_dump(clnt, &req->rc);
1757 p9_tag_remove(clnt, req);
1758 goto error;
1759 }
1760
1761 p9_debug(P9_DEBUG_9P,
1762 "<<< RGETATTR st_result_mask=%lld\n"
1763 "<<< qid=%x.%llx.%x\n"
1764 "<<< st_mode=%8.8x st_nlink=%llu\n"
1765 "<<< st_uid=%d st_gid=%d\n"
1766 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1767 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1768 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1769 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1770 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1771 "<<< st_gen=%lld st_data_version=%lld\n",
1772 ret->st_result_mask, ret->qid.type, ret->qid.path,
1773 ret->qid.version, ret->st_mode, ret->st_nlink,
1774 from_kuid(&init_user_ns, ret->st_uid),
1775 from_kgid(&init_user_ns, ret->st_gid),
1776 ret->st_rdev, ret->st_size, ret->st_blksize,
1777 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1778 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1779 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1780 ret->st_gen, ret->st_data_version);
1781
1782 p9_tag_remove(clnt, req);
1783 return ret;
1784
1785 error:
1786 kfree(ret);
1787 return ERR_PTR(err);
1788 }
1789 EXPORT_SYMBOL(p9_client_getattr_dotl);
1790
1791 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1792 {
1793 int ret;
1794
1795 /* NOTE: size shouldn't include its own length */
1796 /* size[2] type[2] dev[4] qid[13] */
1797 /* mode[4] atime[4] mtime[4] length[8]*/
1798 /* name[s] uid[s] gid[s] muid[s] */
1799 ret = 2+4+13+4+4+4+8+2+2+2+2;
1800
1801 if (wst->name)
1802 ret += strlen(wst->name);
1803 if (wst->uid)
1804 ret += strlen(wst->uid);
1805 if (wst->gid)
1806 ret += strlen(wst->gid);
1807 if (wst->muid)
1808 ret += strlen(wst->muid);
1809
1810 if ((proto_version == p9_proto_2000u) ||
1811 (proto_version == p9_proto_2000L)) {
1812 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1813 if (wst->extension)
1814 ret += strlen(wst->extension);
1815 }
1816
1817 return ret;
1818 }
1819
1820 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1821 {
1822 int err;
1823 struct p9_req_t *req;
1824 struct p9_client *clnt;
1825
1826 err = 0;
1827 clnt = fid->clnt;
1828 wst->size = p9_client_statsize(wst, clnt->proto_version);
1829 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1830 p9_debug(P9_DEBUG_9P,
1831 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1832 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1833 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1834 " uid=%d gid=%d n_muid=%d\n",
1835 wst->size, wst->type, wst->dev, wst->qid.type,
1836 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1837 wst->atime, wst->mtime, (unsigned long long)wst->length,
1838 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1839 from_kuid(&init_user_ns, wst->n_uid),
1840 from_kgid(&init_user_ns, wst->n_gid),
1841 from_kuid(&init_user_ns, wst->n_muid));
1842
1843 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1844 if (IS_ERR(req)) {
1845 err = PTR_ERR(req);
1846 goto error;
1847 }
1848
1849 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1850
1851 p9_tag_remove(clnt, req);
1852 error:
1853 return err;
1854 }
1855 EXPORT_SYMBOL(p9_client_wstat);
1856
1857 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1858 {
1859 int err;
1860 struct p9_req_t *req;
1861 struct p9_client *clnt;
1862
1863 err = 0;
1864 clnt = fid->clnt;
1865 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1866 p9_debug(P9_DEBUG_9P,
1867 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1868 " atime_sec=%lld atime_nsec=%lld\n"
1869 " mtime_sec=%lld mtime_nsec=%lld\n",
1870 p9attr->valid, p9attr->mode,
1871 from_kuid(&init_user_ns, p9attr->uid),
1872 from_kgid(&init_user_ns, p9attr->gid),
1873 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1874 p9attr->mtime_sec, p9attr->mtime_nsec);
1875
1876 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1877
1878 if (IS_ERR(req)) {
1879 err = PTR_ERR(req);
1880 goto error;
1881 }
1882 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1883 p9_tag_remove(clnt, req);
1884 error:
1885 return err;
1886 }
1887 EXPORT_SYMBOL(p9_client_setattr);
1888
1889 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1890 {
1891 int err;
1892 struct p9_req_t *req;
1893 struct p9_client *clnt;
1894
1895 err = 0;
1896 clnt = fid->clnt;
1897
1898 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1899
1900 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1901 if (IS_ERR(req)) {
1902 err = PTR_ERR(req);
1903 goto error;
1904 }
1905
1906 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1907 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1908 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1909 if (err) {
1910 trace_9p_protocol_dump(clnt, &req->rc);
1911 p9_tag_remove(clnt, req);
1912 goto error;
1913 }
1914
1915 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1916 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1917 "fsid %llu namelen %ld\n",
1918 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1919 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1920 sb->fsid, (long int)sb->namelen);
1921
1922 p9_tag_remove(clnt, req);
1923 error:
1924 return err;
1925 }
1926 EXPORT_SYMBOL(p9_client_statfs);
1927
1928 int p9_client_rename(struct p9_fid *fid,
1929 struct p9_fid *newdirfid, const char *name)
1930 {
1931 int err;
1932 struct p9_req_t *req;
1933 struct p9_client *clnt;
1934
1935 err = 0;
1936 clnt = fid->clnt;
1937
1938 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1939 fid->fid, newdirfid->fid, name);
1940
1941 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1942 newdirfid->fid, name);
1943 if (IS_ERR(req)) {
1944 err = PTR_ERR(req);
1945 goto error;
1946 }
1947
1948 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1949
1950 p9_tag_remove(clnt, req);
1951 error:
1952 return err;
1953 }
1954 EXPORT_SYMBOL(p9_client_rename);
1955
1956 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1957 struct p9_fid *newdirfid, const char *new_name)
1958 {
1959 int err;
1960 struct p9_req_t *req;
1961 struct p9_client *clnt;
1962
1963 err = 0;
1964 clnt = olddirfid->clnt;
1965
1966 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1967 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1968 newdirfid->fid, new_name);
1969
1970 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1971 old_name, newdirfid->fid, new_name);
1972 if (IS_ERR(req)) {
1973 err = PTR_ERR(req);
1974 goto error;
1975 }
1976
1977 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1978 newdirfid->fid, new_name);
1979
1980 p9_tag_remove(clnt, req);
1981 error:
1982 return err;
1983 }
1984 EXPORT_SYMBOL(p9_client_renameat);
1985
1986 /*
1987 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1988 */
1989 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1990 const char *attr_name, u64 *attr_size)
1991 {
1992 int err;
1993 struct p9_req_t *req;
1994 struct p9_client *clnt;
1995 struct p9_fid *attr_fid;
1996
1997 err = 0;
1998 clnt = file_fid->clnt;
1999 attr_fid = p9_fid_create(clnt);
2000 if (!attr_fid) {
2001 err = -ENOMEM;
2002 goto error;
2003 }
2004 p9_debug(P9_DEBUG_9P,
2005 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2006 file_fid->fid, attr_fid->fid, attr_name);
2007
2008 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2009 file_fid->fid, attr_fid->fid, attr_name);
2010 if (IS_ERR(req)) {
2011 err = PTR_ERR(req);
2012 goto error;
2013 }
2014 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size);
2015 if (err) {
2016 trace_9p_protocol_dump(clnt, &req->rc);
2017 p9_tag_remove(clnt, req);
2018 goto clunk_fid;
2019 }
2020 p9_tag_remove(clnt, req);
2021 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2022 attr_fid->fid, *attr_size);
2023 return attr_fid;
2024 clunk_fid:
2025 p9_client_clunk(attr_fid);
2026 attr_fid = NULL;
2027 error:
2028 if (attr_fid && (attr_fid != file_fid))
2029 p9_fid_destroy(attr_fid);
2030
2031 return ERR_PTR(err);
2032 }
2033 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2034
2035 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2036 u64 attr_size, int flags)
2037 {
2038 int err;
2039 struct p9_req_t *req;
2040 struct p9_client *clnt;
2041
2042 p9_debug(P9_DEBUG_9P,
2043 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2044 fid->fid, name, (long long)attr_size, flags);
2045 err = 0;
2046 clnt = fid->clnt;
2047 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2048 fid->fid, name, attr_size, flags);
2049 if (IS_ERR(req)) {
2050 err = PTR_ERR(req);
2051 goto error;
2052 }
2053 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2054 p9_tag_remove(clnt, req);
2055 error:
2056 return err;
2057 }
2058 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2059
2060 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2061 {
2062 int err, rsize, non_zc = 0;
2063 struct p9_client *clnt;
2064 struct p9_req_t *req;
2065 char *dataptr;
2066 struct kvec kv = {.iov_base = data, .iov_len = count};
2067 struct iov_iter to;
2068
2069 iov_iter_kvec(&to, READ, &kv, 1, count);
2070
2071 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2072 fid->fid, (unsigned long long) offset, count);
2073
2074 err = 0;
2075 clnt = fid->clnt;
2076
2077 rsize = fid->iounit;
2078 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2079 rsize = clnt->msize - P9_READDIRHDRSZ;
2080
2081 if (count < rsize)
2082 rsize = count;
2083
2084 /* Don't bother zerocopy for small IO (< 1024) */
2085 if (clnt->trans_mod->zc_request && rsize > 1024) {
2086 /*
2087 * response header len is 11
2088 * PDU Header(7) + IO Size (4)
2089 */
2090 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0,
2091 11, "dqd", fid->fid, offset, rsize);
2092 } else {
2093 non_zc = 1;
2094 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2095 offset, rsize);
2096 }
2097 if (IS_ERR(req)) {
2098 err = PTR_ERR(req);
2099 goto error;
2100 }
2101
2102 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr);
2103 if (err) {
2104 trace_9p_protocol_dump(clnt, &req->rc);
2105 goto free_and_error;
2106 }
2107 if (rsize < count) {
2108 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize);
2109 count = rsize;
2110 }
2111
2112 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2113
2114 if (non_zc)
2115 memmove(data, dataptr, count);
2116
2117 p9_tag_remove(clnt, req);
2118 return count;
2119
2120 free_and_error:
2121 p9_tag_remove(clnt, req);
2122 error:
2123 return err;
2124 }
2125 EXPORT_SYMBOL(p9_client_readdir);
2126
2127 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode,
2128 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2129 {
2130 int err;
2131 struct p9_client *clnt;
2132 struct p9_req_t *req;
2133
2134 err = 0;
2135 clnt = fid->clnt;
2136 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2137 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2138 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2139 MAJOR(rdev), MINOR(rdev), gid);
2140 if (IS_ERR(req))
2141 return PTR_ERR(req);
2142
2143 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
2144 if (err) {
2145 trace_9p_protocol_dump(clnt, &req->rc);
2146 goto error;
2147 }
2148 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2149 (unsigned long long)qid->path, qid->version);
2150
2151 error:
2152 p9_tag_remove(clnt, req);
2153 return err;
2154
2155 }
2156 EXPORT_SYMBOL(p9_client_mknod_dotl);
2157
2158 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode,
2159 kgid_t gid, struct p9_qid *qid)
2160 {
2161 int err;
2162 struct p9_client *clnt;
2163 struct p9_req_t *req;
2164
2165 err = 0;
2166 clnt = fid->clnt;
2167 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2168 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2169 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
2170 gid);
2171 if (IS_ERR(req))
2172 return PTR_ERR(req);
2173
2174 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
2175 if (err) {
2176 trace_9p_protocol_dump(clnt, &req->rc);
2177 goto error;
2178 }
2179 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2180 (unsigned long long)qid->path, qid->version);
2181
2182 error:
2183 p9_tag_remove(clnt, req);
2184 return err;
2185
2186 }
2187 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2188
2189 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2190 {
2191 int err;
2192 struct p9_client *clnt;
2193 struct p9_req_t *req;
2194
2195 err = 0;
2196 clnt = fid->clnt;
2197 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2198 "start %lld length %lld proc_id %d client_id %s\n",
2199 fid->fid, flock->type, flock->flags, flock->start,
2200 flock->length, flock->proc_id, flock->client_id);
2201
2202 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2203 flock->flags, flock->start, flock->length,
2204 flock->proc_id, flock->client_id);
2205
2206 if (IS_ERR(req))
2207 return PTR_ERR(req);
2208
2209 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status);
2210 if (err) {
2211 trace_9p_protocol_dump(clnt, &req->rc);
2212 goto error;
2213 }
2214 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2215 error:
2216 p9_tag_remove(clnt, req);
2217 return err;
2218
2219 }
2220 EXPORT_SYMBOL(p9_client_lock_dotl);
2221
2222 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2223 {
2224 int err;
2225 struct p9_client *clnt;
2226 struct p9_req_t *req;
2227
2228 err = 0;
2229 clnt = fid->clnt;
2230 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2231 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2232 glock->start, glock->length, glock->proc_id, glock->client_id);
2233
2234 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2235 glock->start, glock->length, glock->proc_id, glock->client_id);
2236
2237 if (IS_ERR(req))
2238 return PTR_ERR(req);
2239
2240 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type,
2241 &glock->start, &glock->length, &glock->proc_id,
2242 &glock->client_id);
2243 if (err) {
2244 trace_9p_protocol_dump(clnt, &req->rc);
2245 goto error;
2246 }
2247 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2248 "proc_id %d client_id %s\n", glock->type, glock->start,
2249 glock->length, glock->proc_id, glock->client_id);
2250 error:
2251 p9_tag_remove(clnt, req);
2252 return err;
2253 }
2254 EXPORT_SYMBOL(p9_client_getlock_dotl);
2255
2256 int p9_client_readlink(struct p9_fid *fid, char **target)
2257 {
2258 int err;
2259 struct p9_client *clnt;
2260 struct p9_req_t *req;
2261
2262 err = 0;
2263 clnt = fid->clnt;
2264 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2265
2266 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2267 if (IS_ERR(req))
2268 return PTR_ERR(req);
2269
2270 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target);
2271 if (err) {
2272 trace_9p_protocol_dump(clnt, &req->rc);
2273 goto error;
2274 }
2275 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2276 error:
2277 p9_tag_remove(clnt, req);
2278 return err;
2279 }
2280 EXPORT_SYMBOL(p9_client_readlink);
2281
2282 int __init p9_client_init(void)
2283 {
2284 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU);
2285 return p9_req_cache ? 0 : -ENOMEM;
2286 }
2287
2288 void __exit p9_client_exit(void)
2289 {
2290 kmem_cache_destroy(p9_req_cache);
2291 }
Linux with added FPC-III support