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1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * net/9p/clnt.c
4 *
5 * 9P Client
6 *
7 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
8 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
9 */
10
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13 #include <linux/module.h>
14 #include <linux/errno.h>
15 #include <linux/fs.h>
16 #include <linux/poll.h>
17 #include <linux/idr.h>
18 #include <linux/mutex.h>
19 #include <linux/slab.h>
20 #include <linux/sched/signal.h>
21 #include <linux/uaccess.h>
22 #include <linux/uio.h>
23 #include <net/9p/9p.h>
24 #include <linux/parser.h>
25 #include <linux/seq_file.h>
26 #include <net/9p/client.h>
27 #include <net/9p/transport.h>
28 #include "protocol.h"
29
30 #define CREATE_TRACE_POINTS
31 #include <trace/events/9p.h>
32
33 /*
34 * Client Option Parsing (code inspired by NFS code)
35 * - a little lazy - parse all client options
36 */
37
38 enum {
39 Opt_msize,
40 Opt_trans,
41 Opt_legacy,
42 Opt_version,
43 Opt_err,
44 };
45
46 static const match_table_t tokens = {
47 {Opt_msize, "msize=%u"},
48 {Opt_legacy, "noextend"},
49 {Opt_trans, "trans=%s"},
50 {Opt_version, "version=%s"},
51 {Opt_err, NULL},
52 };
53
54 inline int p9_is_proto_dotl(struct p9_client *clnt)
55 {
56 return clnt->proto_version == p9_proto_2000L;
57 }
58 EXPORT_SYMBOL(p9_is_proto_dotl);
59
60 inline int p9_is_proto_dotu(struct p9_client *clnt)
61 {
62 return clnt->proto_version == p9_proto_2000u;
63 }
64 EXPORT_SYMBOL(p9_is_proto_dotu);
65
66 int p9_show_client_options(struct seq_file *m, struct p9_client *clnt)
67 {
68 if (clnt->msize != 8192)
69 seq_printf(m, ",msize=%u", clnt->msize);
70 seq_printf(m, ",trans=%s", clnt->trans_mod->name);
71
72 switch (clnt->proto_version) {
73 case p9_proto_legacy:
74 seq_puts(m, ",noextend");
75 break;
76 case p9_proto_2000u:
77 seq_puts(m, ",version=9p2000.u");
78 break;
79 case p9_proto_2000L:
80 /* Default */
81 break;
82 }
83
84 if (clnt->trans_mod->show_options)
85 return clnt->trans_mod->show_options(m, clnt);
86 return 0;
87 }
88 EXPORT_SYMBOL(p9_show_client_options);
89
90 /*
91 * Some error codes are taken directly from the server replies,
92 * make sure they are valid.
93 */
94 static int safe_errno(int err)
95 {
96 if ((err > 0) || (err < -MAX_ERRNO)) {
97 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err);
98 return -EPROTO;
99 }
100 return err;
101 }
102
103
104 /* Interpret mount option for protocol version */
105 static int get_protocol_version(char *s)
106 {
107 int version = -EINVAL;
108
109 if (!strcmp(s, "9p2000")) {
110 version = p9_proto_legacy;
111 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n");
112 } else if (!strcmp(s, "9p2000.u")) {
113 version = p9_proto_2000u;
114 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
115 } else if (!strcmp(s, "9p2000.L")) {
116 version = p9_proto_2000L;
117 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
118 } else
119 pr_info("Unknown protocol version %s\n", s);
120
121 return version;
122 }
123
124 /**
125 * parse_options - parse mount options into client structure
126 * @opts: options string passed from mount
127 * @clnt: existing v9fs client information
128 *
129 * Return 0 upon success, -ERRNO upon failure
130 */
131
132 static int parse_opts(char *opts, struct p9_client *clnt)
133 {
134 char *options, *tmp_options;
135 char *p;
136 substring_t args[MAX_OPT_ARGS];
137 int option;
138 char *s;
139 int ret = 0;
140
141 clnt->proto_version = p9_proto_2000L;
142 clnt->msize = 8192;
143
144 if (!opts)
145 return 0;
146
147 tmp_options = kstrdup(opts, GFP_KERNEL);
148 if (!tmp_options) {
149 p9_debug(P9_DEBUG_ERROR,
150 "failed to allocate copy of option string\n");
151 return -ENOMEM;
152 }
153 options = tmp_options;
154
155 while ((p = strsep(&options, ",")) != NULL) {
156 int token, r;
157 if (!*p)
158 continue;
159 token = match_token(p, tokens, args);
160 switch (token) {
161 case Opt_msize:
162 r = match_int(&args[0], &option);
163 if (r < 0) {
164 p9_debug(P9_DEBUG_ERROR,
165 "integer field, but no integer?\n");
166 ret = r;
167 continue;
168 }
169 if (option < 4096) {
170 p9_debug(P9_DEBUG_ERROR,
171 "msize should be at least 4k\n");
172 ret = -EINVAL;
173 continue;
174 }
175 clnt->msize = option;
176 break;
177 case Opt_trans:
178 s = match_strdup(&args[0]);
179 if (!s) {
180 ret = -ENOMEM;
181 p9_debug(P9_DEBUG_ERROR,
182 "problem allocating copy of trans arg\n");
183 goto free_and_return;
184 }
185
186 v9fs_put_trans(clnt->trans_mod);
187 clnt->trans_mod = v9fs_get_trans_by_name(s);
188 if (clnt->trans_mod == NULL) {
189 pr_info("Could not find request transport: %s\n",
190 s);
191 ret = -EINVAL;
192 }
193 kfree(s);
194 break;
195 case Opt_legacy:
196 clnt->proto_version = p9_proto_legacy;
197 break;
198 case Opt_version:
199 s = match_strdup(&args[0]);
200 if (!s) {
201 ret = -ENOMEM;
202 p9_debug(P9_DEBUG_ERROR,
203 "problem allocating copy of version arg\n");
204 goto free_and_return;
205 }
206 r = get_protocol_version(s);
207 if (r < 0)
208 ret = r;
209 else
210 clnt->proto_version = r;
211 kfree(s);
212 break;
213 default:
214 continue;
215 }
216 }
217
218 free_and_return:
219 if (ret)
220 v9fs_put_trans(clnt->trans_mod);
221 kfree(tmp_options);
222 return ret;
223 }
224
225 static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc,
226 int alloc_msize)
227 {
228 if (likely(c->fcall_cache) && alloc_msize == c->msize) {
229 fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS);
230 fc->cache = c->fcall_cache;
231 } else {
232 fc->sdata = kmalloc(alloc_msize, GFP_NOFS);
233 fc->cache = NULL;
234 }
235 if (!fc->sdata)
236 return -ENOMEM;
237 fc->capacity = alloc_msize;
238 return 0;
239 }
240
241 void p9_fcall_fini(struct p9_fcall *fc)
242 {
243 /* sdata can be NULL for interrupted requests in trans_rdma,
244 * and kmem_cache_free does not do NULL-check for us
245 */
246 if (unlikely(!fc->sdata))
247 return;
248
249 if (fc->cache)
250 kmem_cache_free(fc->cache, fc->sdata);
251 else
252 kfree(fc->sdata);
253 }
254 EXPORT_SYMBOL(p9_fcall_fini);
255
256 static struct kmem_cache *p9_req_cache;
257
258 /**
259 * p9_req_alloc - Allocate a new request.
260 * @c: Client session.
261 * @type: Transaction type.
262 * @max_size: Maximum packet size for this request.
263 *
264 * Context: Process context.
265 * Return: Pointer to new request.
266 */
267 static struct p9_req_t *
268 p9_tag_alloc(struct p9_client *c, int8_t type, unsigned int max_size)
269 {
270 struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS);
271 int alloc_msize = min(c->msize, max_size);
272 int tag;
273
274 if (!req)
275 return ERR_PTR(-ENOMEM);
276
277 if (p9_fcall_init(c, &req->tc, alloc_msize))
278 goto free_req;
279 if (p9_fcall_init(c, &req->rc, alloc_msize))
280 goto free;
281
282 p9pdu_reset(&req->tc);
283 p9pdu_reset(&req->rc);
284 req->t_err = 0;
285 req->status = REQ_STATUS_ALLOC;
286 init_waitqueue_head(&req->wq);
287 INIT_LIST_HEAD(&req->req_list);
288
289 idr_preload(GFP_NOFS);
290 spin_lock_irq(&c->lock);
291 if (type == P9_TVERSION)
292 tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1,
293 GFP_NOWAIT);
294 else
295 tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT);
296 req->tc.tag = tag;
297 spin_unlock_irq(&c->lock);
298 idr_preload_end();
299 if (tag < 0)
300 goto free;
301
302 /* Init ref to two because in the general case there is one ref
303 * that is put asynchronously by a writer thread, one ref
304 * temporarily given by p9_tag_lookup and put by p9_client_cb
305 * in the recv thread, and one ref put by p9_tag_remove in the
306 * main thread. The only exception is virtio that does not use
307 * p9_tag_lookup but does not have a writer thread either
308 * (the write happens synchronously in the request/zc_request
309 * callback), so p9_client_cb eats the second ref there
310 * as the pointer is duplicated directly by virtqueue_add_sgs()
311 */
312 refcount_set(&req->refcount.refcount, 2);
313
314 return req;
315
316 free:
317 p9_fcall_fini(&req->tc);
318 p9_fcall_fini(&req->rc);
319 free_req:
320 kmem_cache_free(p9_req_cache, req);
321 return ERR_PTR(-ENOMEM);
322 }
323
324 /**
325 * p9_tag_lookup - Look up a request by tag.
326 * @c: Client session.
327 * @tag: Transaction ID.
328 *
329 * Context: Any context.
330 * Return: A request, or %NULL if there is no request with that tag.
331 */
332 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
333 {
334 struct p9_req_t *req;
335
336 rcu_read_lock();
337 again:
338 req = idr_find(&c->reqs, tag);
339 if (req) {
340 /* We have to be careful with the req found under rcu_read_lock
341 * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the
342 * ref again without corrupting other data, then check again
343 * that the tag matches once we have the ref
344 */
345 if (!p9_req_try_get(req))
346 goto again;
347 if (req->tc.tag != tag) {
348 p9_req_put(req);
349 goto again;
350 }
351 }
352 rcu_read_unlock();
353
354 return req;
355 }
356 EXPORT_SYMBOL(p9_tag_lookup);
357
358 /**
359 * p9_tag_remove - Remove a tag.
360 * @c: Client session.
361 * @r: Request of reference.
362 *
363 * Context: Any context.
364 */
365 static int p9_tag_remove(struct p9_client *c, struct p9_req_t *r)
366 {
367 unsigned long flags;
368 u16 tag = r->tc.tag;
369
370 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
371 spin_lock_irqsave(&c->lock, flags);
372 idr_remove(&c->reqs, tag);
373 spin_unlock_irqrestore(&c->lock, flags);
374 return p9_req_put(r);
375 }
376
377 static void p9_req_free(struct kref *ref)
378 {
379 struct p9_req_t *r = container_of(ref, struct p9_req_t, refcount);
380 p9_fcall_fini(&r->tc);
381 p9_fcall_fini(&r->rc);
382 kmem_cache_free(p9_req_cache, r);
383 }
384
385 int p9_req_put(struct p9_req_t *r)
386 {
387 return kref_put(&r->refcount, p9_req_free);
388 }
389 EXPORT_SYMBOL(p9_req_put);
390
391 /**
392 * p9_tag_cleanup - cleans up tags structure and reclaims resources
393 * @c: v9fs client struct
394 *
395 * This frees resources associated with the tags structure
396 *
397 */
398 static void p9_tag_cleanup(struct p9_client *c)
399 {
400 struct p9_req_t *req;
401 int id;
402
403 rcu_read_lock();
404 idr_for_each_entry(&c->reqs, req, id) {
405 pr_info("Tag %d still in use\n", id);
406 if (p9_tag_remove(c, req) == 0)
407 pr_warn("Packet with tag %d has still references",
408 req->tc.tag);
409 }
410 rcu_read_unlock();
411 }
412
413 /**
414 * p9_client_cb - call back from transport to client
415 * @c: client state
416 * @req: request received
417 * @status: request status, one of REQ_STATUS_*
418 *
419 */
420 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
421 {
422 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag);
423
424 /*
425 * This barrier is needed to make sure any change made to req before
426 * the status change is visible to another thread
427 */
428 smp_wmb();
429 req->status = status;
430
431 wake_up(&req->wq);
432 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag);
433 p9_req_put(req);
434 }
435 EXPORT_SYMBOL(p9_client_cb);
436
437 /**
438 * p9_parse_header - parse header arguments out of a packet
439 * @pdu: packet to parse
440 * @size: size of packet
441 * @type: type of request
442 * @tag: tag of packet
443 * @rewind: set if we need to rewind offset afterwards
444 */
445
446 int
447 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
448 int rewind)
449 {
450 int8_t r_type;
451 int16_t r_tag;
452 int32_t r_size;
453 int offset = pdu->offset;
454 int err;
455
456 pdu->offset = 0;
457
458 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
459 if (err)
460 goto rewind_and_exit;
461
462 if (type)
463 *type = r_type;
464 if (tag)
465 *tag = r_tag;
466 if (size)
467 *size = r_size;
468
469 if (pdu->size != r_size || r_size < 7) {
470 err = -EINVAL;
471 goto rewind_and_exit;
472 }
473
474 pdu->id = r_type;
475 pdu->tag = r_tag;
476
477 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
478 pdu->size, pdu->id, pdu->tag);
479
480 rewind_and_exit:
481 if (rewind)
482 pdu->offset = offset;
483 return err;
484 }
485 EXPORT_SYMBOL(p9_parse_header);
486
487 /**
488 * p9_check_errors - check 9p packet for error return and process it
489 * @c: current client instance
490 * @req: request to parse and check for error conditions
491 *
492 * returns error code if one is discovered, otherwise returns 0
493 *
494 * this will have to be more complicated if we have multiple
495 * error packet types
496 */
497
498 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
499 {
500 int8_t type;
501 int err;
502 int ecode;
503
504 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0);
505 if (req->rc.size >= c->msize) {
506 p9_debug(P9_DEBUG_ERROR,
507 "requested packet size too big: %d\n",
508 req->rc.size);
509 return -EIO;
510 }
511 /*
512 * dump the response from server
513 * This should be after check errors which poplulate pdu_fcall.
514 */
515 trace_9p_protocol_dump(c, &req->rc);
516 if (err) {
517 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
518 return err;
519 }
520 if (type != P9_RERROR && type != P9_RLERROR)
521 return 0;
522
523 if (!p9_is_proto_dotl(c)) {
524 char *ename;
525 err = p9pdu_readf(&req->rc, c->proto_version, "s?d",
526 &ename, &ecode);
527 if (err)
528 goto out_err;
529
530 if (p9_is_proto_dotu(c) && ecode < 512)
531 err = -ecode;
532
533 if (!err) {
534 err = p9_errstr2errno(ename, strlen(ename));
535
536 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
537 -ecode, ename);
538 }
539 kfree(ename);
540 } else {
541 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode);
542 err = -ecode;
543
544 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
545 }
546
547 return err;
548
549 out_err:
550 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
551
552 return err;
553 }
554
555 /**
556 * p9_check_zc_errors - check 9p packet for error return and process it
557 * @c: current client instance
558 * @req: request to parse and check for error conditions
559 * @uidata: external buffer containing error
560 * @in_hdrlen: Size of response protocol buffer.
561 *
562 * returns error code if one is discovered, otherwise returns 0
563 *
564 * this will have to be more complicated if we have multiple
565 * error packet types
566 */
567
568 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
569 struct iov_iter *uidata, int in_hdrlen)
570 {
571 int err;
572 int ecode;
573 int8_t type;
574 char *ename = NULL;
575
576 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0);
577 /*
578 * dump the response from server
579 * This should be after parse_header which poplulate pdu_fcall.
580 */
581 trace_9p_protocol_dump(c, &req->rc);
582 if (err) {
583 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
584 return err;
585 }
586
587 if (type != P9_RERROR && type != P9_RLERROR)
588 return 0;
589
590 if (!p9_is_proto_dotl(c)) {
591 /* Error is reported in string format */
592 int len;
593 /* 7 = header size for RERROR; */
594 int inline_len = in_hdrlen - 7;
595
596 len = req->rc.size - req->rc.offset;
597 if (len > (P9_ZC_HDR_SZ - 7)) {
598 err = -EFAULT;
599 goto out_err;
600 }
601
602 ename = &req->rc.sdata[req->rc.offset];
603 if (len > inline_len) {
604 /* We have error in external buffer */
605 if (!copy_from_iter_full(ename + inline_len,
606 len - inline_len, uidata)) {
607 err = -EFAULT;
608 goto out_err;
609 }
610 }
611 ename = NULL;
612 err = p9pdu_readf(&req->rc, c->proto_version, "s?d",
613 &ename, &ecode);
614 if (err)
615 goto out_err;
616
617 if (p9_is_proto_dotu(c) && ecode < 512)
618 err = -ecode;
619
620 if (!err) {
621 err = p9_errstr2errno(ename, strlen(ename));
622
623 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
624 -ecode, ename);
625 }
626 kfree(ename);
627 } else {
628 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode);
629 err = -ecode;
630
631 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
632 }
633 return err;
634
635 out_err:
636 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
637 return err;
638 }
639
640 static struct p9_req_t *
641 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
642
643 /**
644 * p9_client_flush - flush (cancel) a request
645 * @c: client state
646 * @oldreq: request to cancel
647 *
648 * This sents a flush for a particular request and links
649 * the flush request to the original request. The current
650 * code only supports a single flush request although the protocol
651 * allows for multiple flush requests to be sent for a single request.
652 *
653 */
654
655 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
656 {
657 struct p9_req_t *req;
658 int16_t oldtag;
659 int err;
660
661 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1);
662 if (err)
663 return err;
664
665 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
666
667 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
668 if (IS_ERR(req))
669 return PTR_ERR(req);
670
671 /*
672 * if we haven't received a response for oldreq,
673 * remove it from the list
674 */
675 if (oldreq->status == REQ_STATUS_SENT) {
676 if (c->trans_mod->cancelled)
677 c->trans_mod->cancelled(c, oldreq);
678 }
679
680 p9_tag_remove(c, req);
681 return 0;
682 }
683
684 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
685 int8_t type, int req_size,
686 const char *fmt, va_list ap)
687 {
688 int err;
689 struct p9_req_t *req;
690
691 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
692
693 /* we allow for any status other than disconnected */
694 if (c->status == Disconnected)
695 return ERR_PTR(-EIO);
696
697 /* if status is begin_disconnected we allow only clunk request */
698 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
699 return ERR_PTR(-EIO);
700
701 req = p9_tag_alloc(c, type, req_size);
702 if (IS_ERR(req))
703 return req;
704
705 /* marshall the data */
706 p9pdu_prepare(&req->tc, req->tc.tag, type);
707 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap);
708 if (err)
709 goto reterr;
710 p9pdu_finalize(c, &req->tc);
711 trace_9p_client_req(c, type, req->tc.tag);
712 return req;
713 reterr:
714 p9_tag_remove(c, req);
715 /* We have to put also the 2nd reference as it won't be used */
716 p9_req_put(req);
717 return ERR_PTR(err);
718 }
719
720 /**
721 * p9_client_rpc - issue a request and wait for a response
722 * @c: client session
723 * @type: type of request
724 * @fmt: protocol format string (see protocol.c)
725 *
726 * Returns request structure (which client must free using p9_tag_remove)
727 */
728
729 static struct p9_req_t *
730 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
731 {
732 va_list ap;
733 int sigpending, err;
734 unsigned long flags;
735 struct p9_req_t *req;
736
737 va_start(ap, fmt);
738 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
739 va_end(ap);
740 if (IS_ERR(req))
741 return req;
742
743 if (signal_pending(current)) {
744 sigpending = 1;
745 clear_thread_flag(TIF_SIGPENDING);
746 } else
747 sigpending = 0;
748
749 err = c->trans_mod->request(c, req);
750 if (err < 0) {
751 /* write won't happen */
752 p9_req_put(req);
753 if (err != -ERESTARTSYS && err != -EFAULT)
754 c->status = Disconnected;
755 goto recalc_sigpending;
756 }
757 again:
758 /* Wait for the response */
759 err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD);
760
761 /*
762 * Make sure our req is coherent with regard to updates in other
763 * threads - echoes to wmb() in the callback
764 */
765 smp_rmb();
766
767 if ((err == -ERESTARTSYS) && (c->status == Connected)
768 && (type == P9_TFLUSH)) {
769 sigpending = 1;
770 clear_thread_flag(TIF_SIGPENDING);
771 goto again;
772 }
773
774 if (req->status == REQ_STATUS_ERROR) {
775 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
776 err = req->t_err;
777 }
778 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
779 p9_debug(P9_DEBUG_MUX, "flushing\n");
780 sigpending = 1;
781 clear_thread_flag(TIF_SIGPENDING);
782
783 if (c->trans_mod->cancel(c, req))
784 p9_client_flush(c, req);
785
786 /* if we received the response anyway, don't signal error */
787 if (req->status == REQ_STATUS_RCVD)
788 err = 0;
789 }
790 recalc_sigpending:
791 if (sigpending) {
792 spin_lock_irqsave(&current->sighand->siglock, flags);
793 recalc_sigpending();
794 spin_unlock_irqrestore(&current->sighand->siglock, flags);
795 }
796 if (err < 0)
797 goto reterr;
798
799 err = p9_check_errors(c, req);
800 trace_9p_client_res(c, type, req->rc.tag, err);
801 if (!err)
802 return req;
803 reterr:
804 p9_tag_remove(c, req);
805 return ERR_PTR(safe_errno(err));
806 }
807
808 /**
809 * p9_client_zc_rpc - issue a request and wait for a response
810 * @c: client session
811 * @type: type of request
812 * @uidata: destination for zero copy read
813 * @uodata: source for zero copy write
814 * @inlen: read buffer size
815 * @olen: write buffer size
816 * @in_hdrlen: reader header size, This is the size of response protocol data
817 * @fmt: protocol format string (see protocol.c)
818 *
819 * Returns request structure (which client must free using p9_tag_remove)
820 */
821 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
822 struct iov_iter *uidata,
823 struct iov_iter *uodata,
824 int inlen, int olen, int in_hdrlen,
825 const char *fmt, ...)
826 {
827 va_list ap;
828 int sigpending, err;
829 unsigned long flags;
830 struct p9_req_t *req;
831
832 va_start(ap, fmt);
833 /*
834 * We allocate a inline protocol data of only 4k bytes.
835 * The actual content is passed in zero-copy fashion.
836 */
837 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
838 va_end(ap);
839 if (IS_ERR(req))
840 return req;
841
842 if (signal_pending(current)) {
843 sigpending = 1;
844 clear_thread_flag(TIF_SIGPENDING);
845 } else
846 sigpending = 0;
847
848 err = c->trans_mod->zc_request(c, req, uidata, uodata,
849 inlen, olen, in_hdrlen);
850 if (err < 0) {
851 if (err == -EIO)
852 c->status = Disconnected;
853 if (err != -ERESTARTSYS)
854 goto recalc_sigpending;
855 }
856 if (req->status == REQ_STATUS_ERROR) {
857 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
858 err = req->t_err;
859 }
860 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
861 p9_debug(P9_DEBUG_MUX, "flushing\n");
862 sigpending = 1;
863 clear_thread_flag(TIF_SIGPENDING);
864
865 if (c->trans_mod->cancel(c, req))
866 p9_client_flush(c, req);
867
868 /* if we received the response anyway, don't signal error */
869 if (req->status == REQ_STATUS_RCVD)
870 err = 0;
871 }
872 recalc_sigpending:
873 if (sigpending) {
874 spin_lock_irqsave(&current->sighand->siglock, flags);
875 recalc_sigpending();
876 spin_unlock_irqrestore(&current->sighand->siglock, flags);
877 }
878 if (err < 0)
879 goto reterr;
880
881 err = p9_check_zc_errors(c, req, uidata, in_hdrlen);
882 trace_9p_client_res(c, type, req->rc.tag, err);
883 if (!err)
884 return req;
885 reterr:
886 p9_tag_remove(c, req);
887 return ERR_PTR(safe_errno(err));
888 }
889
890 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
891 {
892 int ret;
893 struct p9_fid *fid;
894
895 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
896 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
897 if (!fid)
898 return NULL;
899
900 memset(&fid->qid, 0, sizeof(struct p9_qid));
901 fid->mode = -1;
902 fid->uid = current_fsuid();
903 fid->clnt = clnt;
904 fid->rdir = NULL;
905 fid->fid = 0;
906 refcount_set(&fid->count, 1);
907
908 idr_preload(GFP_KERNEL);
909 spin_lock_irq(&clnt->lock);
910 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1,
911 GFP_NOWAIT);
912 spin_unlock_irq(&clnt->lock);
913 idr_preload_end();
914 if (!ret)
915 return fid;
916
917 kfree(fid);
918 return NULL;
919 }
920
921 static void p9_fid_destroy(struct p9_fid *fid)
922 {
923 struct p9_client *clnt;
924 unsigned long flags;
925
926 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
927 clnt = fid->clnt;
928 spin_lock_irqsave(&clnt->lock, flags);
929 idr_remove(&clnt->fids, fid->fid);
930 spin_unlock_irqrestore(&clnt->lock, flags);
931 kfree(fid->rdir);
932 kfree(fid);
933 }
934
935 static int p9_client_version(struct p9_client *c)
936 {
937 int err = 0;
938 struct p9_req_t *req;
939 char *version = NULL;
940 int msize;
941
942 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
943 c->msize, c->proto_version);
944
945 switch (c->proto_version) {
946 case p9_proto_2000L:
947 req = p9_client_rpc(c, P9_TVERSION, "ds",
948 c->msize, "9P2000.L");
949 break;
950 case p9_proto_2000u:
951 req = p9_client_rpc(c, P9_TVERSION, "ds",
952 c->msize, "9P2000.u");
953 break;
954 case p9_proto_legacy:
955 req = p9_client_rpc(c, P9_TVERSION, "ds",
956 c->msize, "9P2000");
957 break;
958 default:
959 return -EINVAL;
960 }
961
962 if (IS_ERR(req))
963 return PTR_ERR(req);
964
965 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version);
966 if (err) {
967 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
968 trace_9p_protocol_dump(c, &req->rc);
969 goto error;
970 }
971
972 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
973 if (!strncmp(version, "9P2000.L", 8))
974 c->proto_version = p9_proto_2000L;
975 else if (!strncmp(version, "9P2000.u", 8))
976 c->proto_version = p9_proto_2000u;
977 else if (!strncmp(version, "9P2000", 6))
978 c->proto_version = p9_proto_legacy;
979 else {
980 p9_debug(P9_DEBUG_ERROR,
981 "server returned an unknown version: %s\n", version);
982 err = -EREMOTEIO;
983 goto error;
984 }
985
986 if (msize < 4096) {
987 p9_debug(P9_DEBUG_ERROR,
988 "server returned a msize < 4096: %d\n", msize);
989 err = -EREMOTEIO;
990 goto error;
991 }
992 if (msize < c->msize)
993 c->msize = msize;
994
995 error:
996 kfree(version);
997 p9_tag_remove(c, req);
998
999 return err;
1000 }
1001
1002 struct p9_client *p9_client_create(const char *dev_name, char *options)
1003 {
1004 int err;
1005 struct p9_client *clnt;
1006 char *client_id;
1007
1008 err = 0;
1009 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
1010 if (!clnt)
1011 return ERR_PTR(-ENOMEM);
1012
1013 clnt->trans_mod = NULL;
1014 clnt->trans = NULL;
1015 clnt->fcall_cache = NULL;
1016
1017 client_id = utsname()->nodename;
1018 memcpy(clnt->name, client_id, strlen(client_id) + 1);
1019
1020 spin_lock_init(&clnt->lock);
1021 idr_init(&clnt->fids);
1022 idr_init(&clnt->reqs);
1023
1024 err = parse_opts(options, clnt);
1025 if (err < 0)
1026 goto free_client;
1027
1028 if (!clnt->trans_mod)
1029 clnt->trans_mod = v9fs_get_default_trans();
1030
1031 if (clnt->trans_mod == NULL) {
1032 err = -EPROTONOSUPPORT;
1033 p9_debug(P9_DEBUG_ERROR,
1034 "No transport defined or default transport\n");
1035 goto free_client;
1036 }
1037
1038 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1039 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1040
1041 err = clnt->trans_mod->create(clnt, dev_name, options);
1042 if (err)
1043 goto put_trans;
1044
1045 if (clnt->msize > clnt->trans_mod->maxsize)
1046 clnt->msize = clnt->trans_mod->maxsize;
1047
1048 if (clnt->msize < 4096) {
1049 p9_debug(P9_DEBUG_ERROR,
1050 "Please specify a msize of at least 4k\n");
1051 err = -EINVAL;
1052 goto close_trans;
1053 }
1054
1055 err = p9_client_version(clnt);
1056 if (err)
1057 goto close_trans;
1058
1059 /* P9_HDRSZ + 4 is the smallest packet header we can have that is
1060 * followed by data accessed from userspace by read
1061 */
1062 clnt->fcall_cache =
1063 kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize,
1064 0, 0, P9_HDRSZ + 4,
1065 clnt->msize - (P9_HDRSZ + 4),
1066 NULL);
1067
1068 return clnt;
1069
1070 close_trans:
1071 clnt->trans_mod->close(clnt);
1072 put_trans:
1073 v9fs_put_trans(clnt->trans_mod);
1074 free_client:
1075 kfree(clnt);
1076 return ERR_PTR(err);
1077 }
1078 EXPORT_SYMBOL(p9_client_create);
1079
1080 void p9_client_destroy(struct p9_client *clnt)
1081 {
1082 struct p9_fid *fid;
1083 int id;
1084
1085 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1086
1087 if (clnt->trans_mod)
1088 clnt->trans_mod->close(clnt);
1089
1090 v9fs_put_trans(clnt->trans_mod);
1091
1092 idr_for_each_entry(&clnt->fids, fid, id) {
1093 pr_info("Found fid %d not clunked\n", fid->fid);
1094 p9_fid_destroy(fid);
1095 }
1096
1097 p9_tag_cleanup(clnt);
1098
1099 kmem_cache_destroy(clnt->fcall_cache);
1100 kfree(clnt);
1101 }
1102 EXPORT_SYMBOL(p9_client_destroy);
1103
1104 void p9_client_disconnect(struct p9_client *clnt)
1105 {
1106 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1107 clnt->status = Disconnected;
1108 }
1109 EXPORT_SYMBOL(p9_client_disconnect);
1110
1111 void p9_client_begin_disconnect(struct p9_client *clnt)
1112 {
1113 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1114 clnt->status = BeginDisconnect;
1115 }
1116 EXPORT_SYMBOL(p9_client_begin_disconnect);
1117
1118 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1119 const char *uname, kuid_t n_uname, const char *aname)
1120 {
1121 int err = 0;
1122 struct p9_req_t *req;
1123 struct p9_fid *fid;
1124 struct p9_qid qid;
1125
1126
1127 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1128 afid ? afid->fid : -1, uname, aname);
1129 fid = p9_fid_create(clnt);
1130 if (!fid) {
1131 err = -ENOMEM;
1132 goto error;
1133 }
1134 fid->uid = n_uname;
1135
1136 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1137 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1138 if (IS_ERR(req)) {
1139 err = PTR_ERR(req);
1140 goto error;
1141 }
1142
1143 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid);
1144 if (err) {
1145 trace_9p_protocol_dump(clnt, &req->rc);
1146 p9_tag_remove(clnt, req);
1147 goto error;
1148 }
1149
1150 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1151 qid.type, (unsigned long long)qid.path, qid.version);
1152
1153 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1154
1155 p9_tag_remove(clnt, req);
1156 return fid;
1157
1158 error:
1159 if (fid)
1160 p9_fid_destroy(fid);
1161 return ERR_PTR(err);
1162 }
1163 EXPORT_SYMBOL(p9_client_attach);
1164
1165 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1166 const unsigned char * const *wnames, int clone)
1167 {
1168 int err;
1169 struct p9_client *clnt;
1170 struct p9_fid *fid;
1171 struct p9_qid *wqids;
1172 struct p9_req_t *req;
1173 uint16_t nwqids, count;
1174
1175 err = 0;
1176 wqids = NULL;
1177 clnt = oldfid->clnt;
1178 if (clone) {
1179 fid = p9_fid_create(clnt);
1180 if (!fid) {
1181 err = -ENOMEM;
1182 goto error;
1183 }
1184
1185 fid->uid = oldfid->uid;
1186 } else
1187 fid = oldfid;
1188
1189
1190 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1191 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1192 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1193 nwname, wnames);
1194 if (IS_ERR(req)) {
1195 err = PTR_ERR(req);
1196 goto error;
1197 }
1198
1199 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1200 if (err) {
1201 trace_9p_protocol_dump(clnt, &req->rc);
1202 p9_tag_remove(clnt, req);
1203 goto clunk_fid;
1204 }
1205 p9_tag_remove(clnt, req);
1206
1207 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1208
1209 if (nwqids != nwname) {
1210 err = -ENOENT;
1211 goto clunk_fid;
1212 }
1213
1214 for (count = 0; count < nwqids; count++)
1215 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1216 count, wqids[count].type,
1217 (unsigned long long)wqids[count].path,
1218 wqids[count].version);
1219
1220 if (nwname)
1221 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1222 else
1223 memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid));
1224
1225 kfree(wqids);
1226 return fid;
1227
1228 clunk_fid:
1229 kfree(wqids);
1230 p9_client_clunk(fid);
1231 fid = NULL;
1232
1233 error:
1234 if (fid && (fid != oldfid))
1235 p9_fid_destroy(fid);
1236
1237 return ERR_PTR(err);
1238 }
1239 EXPORT_SYMBOL(p9_client_walk);
1240
1241 int p9_client_open(struct p9_fid *fid, int mode)
1242 {
1243 int err;
1244 struct p9_client *clnt;
1245 struct p9_req_t *req;
1246 struct p9_qid qid;
1247 int iounit;
1248
1249 clnt = fid->clnt;
1250 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1251 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1252 err = 0;
1253
1254 if (fid->mode != -1)
1255 return -EINVAL;
1256
1257 if (p9_is_proto_dotl(clnt))
1258 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1259 else
1260 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1261 if (IS_ERR(req)) {
1262 err = PTR_ERR(req);
1263 goto error;
1264 }
1265
1266 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1267 if (err) {
1268 trace_9p_protocol_dump(clnt, &req->rc);
1269 goto free_and_error;
1270 }
1271
1272 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1273 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1274 (unsigned long long)qid.path, qid.version, iounit);
1275
1276 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1277 fid->mode = mode;
1278 fid->iounit = iounit;
1279
1280 free_and_error:
1281 p9_tag_remove(clnt, req);
1282 error:
1283 return err;
1284 }
1285 EXPORT_SYMBOL(p9_client_open);
1286
1287 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode,
1288 kgid_t gid, struct p9_qid *qid)
1289 {
1290 int err = 0;
1291 struct p9_client *clnt;
1292 struct p9_req_t *req;
1293 int iounit;
1294
1295 p9_debug(P9_DEBUG_9P,
1296 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1297 ofid->fid, name, flags, mode,
1298 from_kgid(&init_user_ns, gid));
1299 clnt = ofid->clnt;
1300
1301 if (ofid->mode != -1)
1302 return -EINVAL;
1303
1304 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1305 mode, gid);
1306 if (IS_ERR(req)) {
1307 err = PTR_ERR(req);
1308 goto error;
1309 }
1310
1311 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit);
1312 if (err) {
1313 trace_9p_protocol_dump(clnt, &req->rc);
1314 goto free_and_error;
1315 }
1316
1317 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1318 qid->type,
1319 (unsigned long long)qid->path,
1320 qid->version, iounit);
1321
1322 memmove(&ofid->qid, qid, sizeof(struct p9_qid));
1323 ofid->mode = mode;
1324 ofid->iounit = iounit;
1325
1326 free_and_error:
1327 p9_tag_remove(clnt, req);
1328 error:
1329 return err;
1330 }
1331 EXPORT_SYMBOL(p9_client_create_dotl);
1332
1333 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode,
1334 char *extension)
1335 {
1336 int err;
1337 struct p9_client *clnt;
1338 struct p9_req_t *req;
1339 struct p9_qid qid;
1340 int iounit;
1341
1342 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1343 fid->fid, name, perm, mode);
1344 err = 0;
1345 clnt = fid->clnt;
1346
1347 if (fid->mode != -1)
1348 return -EINVAL;
1349
1350 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1351 mode, extension);
1352 if (IS_ERR(req)) {
1353 err = PTR_ERR(req);
1354 goto error;
1355 }
1356
1357 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1358 if (err) {
1359 trace_9p_protocol_dump(clnt, &req->rc);
1360 goto free_and_error;
1361 }
1362
1363 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1364 qid.type,
1365 (unsigned long long)qid.path,
1366 qid.version, iounit);
1367
1368 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1369 fid->mode = mode;
1370 fid->iounit = iounit;
1371
1372 free_and_error:
1373 p9_tag_remove(clnt, req);
1374 error:
1375 return err;
1376 }
1377 EXPORT_SYMBOL(p9_client_fcreate);
1378
1379 int p9_client_symlink(struct p9_fid *dfid, const char *name,
1380 const char *symtgt, kgid_t gid, struct p9_qid *qid)
1381 {
1382 int err = 0;
1383 struct p9_client *clnt;
1384 struct p9_req_t *req;
1385
1386 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1387 dfid->fid, name, symtgt);
1388 clnt = dfid->clnt;
1389
1390 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1391 gid);
1392 if (IS_ERR(req)) {
1393 err = PTR_ERR(req);
1394 goto error;
1395 }
1396
1397 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
1398 if (err) {
1399 trace_9p_protocol_dump(clnt, &req->rc);
1400 goto free_and_error;
1401 }
1402
1403 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1404 qid->type, (unsigned long long)qid->path, qid->version);
1405
1406 free_and_error:
1407 p9_tag_remove(clnt, req);
1408 error:
1409 return err;
1410 }
1411 EXPORT_SYMBOL(p9_client_symlink);
1412
1413 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname)
1414 {
1415 struct p9_client *clnt;
1416 struct p9_req_t *req;
1417
1418 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1419 dfid->fid, oldfid->fid, newname);
1420 clnt = dfid->clnt;
1421 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1422 newname);
1423 if (IS_ERR(req))
1424 return PTR_ERR(req);
1425
1426 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1427 p9_tag_remove(clnt, req);
1428 return 0;
1429 }
1430 EXPORT_SYMBOL(p9_client_link);
1431
1432 int p9_client_fsync(struct p9_fid *fid, int datasync)
1433 {
1434 int err;
1435 struct p9_client *clnt;
1436 struct p9_req_t *req;
1437
1438 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1439 fid->fid, datasync);
1440 err = 0;
1441 clnt = fid->clnt;
1442
1443 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1444 if (IS_ERR(req)) {
1445 err = PTR_ERR(req);
1446 goto error;
1447 }
1448
1449 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1450
1451 p9_tag_remove(clnt, req);
1452
1453 error:
1454 return err;
1455 }
1456 EXPORT_SYMBOL(p9_client_fsync);
1457
1458 int p9_client_clunk(struct p9_fid *fid)
1459 {
1460 int err;
1461 struct p9_client *clnt;
1462 struct p9_req_t *req;
1463 int retries = 0;
1464
1465 if (!fid || IS_ERR(fid)) {
1466 pr_warn("%s (%d): Trying to clunk with invalid fid\n",
1467 __func__, task_pid_nr(current));
1468 dump_stack();
1469 return 0;
1470 }
1471 if (!refcount_dec_and_test(&fid->count))
1472 return 0;
1473
1474 again:
1475 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1476 retries);
1477 err = 0;
1478 clnt = fid->clnt;
1479
1480 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1481 if (IS_ERR(req)) {
1482 err = PTR_ERR(req);
1483 goto error;
1484 }
1485
1486 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1487
1488 p9_tag_remove(clnt, req);
1489 error:
1490 /*
1491 * Fid is not valid even after a failed clunk
1492 * If interrupted, retry once then give up and
1493 * leak fid until umount.
1494 */
1495 if (err == -ERESTARTSYS) {
1496 if (retries++ == 0)
1497 goto again;
1498 } else
1499 p9_fid_destroy(fid);
1500 return err;
1501 }
1502 EXPORT_SYMBOL(p9_client_clunk);
1503
1504 int p9_client_remove(struct p9_fid *fid)
1505 {
1506 int err;
1507 struct p9_client *clnt;
1508 struct p9_req_t *req;
1509
1510 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1511 err = 0;
1512 clnt = fid->clnt;
1513
1514 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1515 if (IS_ERR(req)) {
1516 err = PTR_ERR(req);
1517 goto error;
1518 }
1519
1520 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1521
1522 p9_tag_remove(clnt, req);
1523 error:
1524 if (err == -ERESTARTSYS)
1525 p9_client_clunk(fid);
1526 else
1527 p9_fid_destroy(fid);
1528 return err;
1529 }
1530 EXPORT_SYMBOL(p9_client_remove);
1531
1532 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1533 {
1534 int err = 0;
1535 struct p9_req_t *req;
1536 struct p9_client *clnt;
1537
1538 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1539 dfid->fid, name, flags);
1540
1541 clnt = dfid->clnt;
1542 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1543 if (IS_ERR(req)) {
1544 err = PTR_ERR(req);
1545 goto error;
1546 }
1547 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1548
1549 p9_tag_remove(clnt, req);
1550 error:
1551 return err;
1552 }
1553 EXPORT_SYMBOL(p9_client_unlinkat);
1554
1555 int
1556 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
1557 {
1558 int total = 0;
1559 *err = 0;
1560
1561 while (iov_iter_count(to)) {
1562 int count;
1563
1564 count = p9_client_read_once(fid, offset, to, err);
1565 if (!count || *err)
1566 break;
1567 offset += count;
1568 total += count;
1569 }
1570 return total;
1571 }
1572 EXPORT_SYMBOL(p9_client_read);
1573
1574 int
1575 p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to,
1576 int *err)
1577 {
1578 struct p9_client *clnt = fid->clnt;
1579 struct p9_req_t *req;
1580 int count = iov_iter_count(to);
1581 int rsize, non_zc = 0;
1582 char *dataptr;
1583
1584 *err = 0;
1585 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1586 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to));
1587
1588 rsize = fid->iounit;
1589 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ)
1590 rsize = clnt->msize - P9_IOHDRSZ;
1591
1592 if (count < rsize)
1593 rsize = count;
1594
1595 /* Don't bother zerocopy for small IO (< 1024) */
1596 if (clnt->trans_mod->zc_request && rsize > 1024) {
1597 /* response header len is 11
1598 * PDU Header(7) + IO Size (4)
1599 */
1600 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize,
1601 0, 11, "dqd", fid->fid,
1602 offset, rsize);
1603 } else {
1604 non_zc = 1;
1605 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1606 rsize);
1607 }
1608 if (IS_ERR(req)) {
1609 *err = PTR_ERR(req);
1610 return 0;
1611 }
1612
1613 *err = p9pdu_readf(&req->rc, clnt->proto_version,
1614 "D", &count, &dataptr);
1615 if (*err) {
1616 trace_9p_protocol_dump(clnt, &req->rc);
1617 p9_tag_remove(clnt, req);
1618 return 0;
1619 }
1620 if (rsize < count) {
1621 pr_err("bogus RREAD count (%d > %d)\n", count, rsize);
1622 count = rsize;
1623 }
1624
1625 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1626
1627 if (non_zc) {
1628 int n = copy_to_iter(dataptr, count, to);
1629
1630 if (n != count) {
1631 *err = -EFAULT;
1632 p9_tag_remove(clnt, req);
1633 return n;
1634 }
1635 } else {
1636 iov_iter_advance(to, count);
1637 }
1638 p9_tag_remove(clnt, req);
1639 return count;
1640 }
1641 EXPORT_SYMBOL(p9_client_read_once);
1642
1643 int
1644 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
1645 {
1646 struct p9_client *clnt = fid->clnt;
1647 struct p9_req_t *req;
1648 int total = 0;
1649 *err = 0;
1650
1651 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n",
1652 fid->fid, (unsigned long long) offset,
1653 iov_iter_count(from));
1654
1655 while (iov_iter_count(from)) {
1656 int count = iov_iter_count(from);
1657 int rsize = fid->iounit;
1658 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1659 rsize = clnt->msize - P9_IOHDRSZ;
1660
1661 if (count < rsize)
1662 rsize = count;
1663
1664 /* Don't bother zerocopy for small IO (< 1024) */
1665 if (clnt->trans_mod->zc_request && rsize > 1024) {
1666 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
1667 rsize, P9_ZC_HDR_SZ, "dqd",
1668 fid->fid, offset, rsize);
1669 } else {
1670 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
1671 offset, rsize, from);
1672 }
1673 if (IS_ERR(req)) {
1674 *err = PTR_ERR(req);
1675 break;
1676 }
1677
1678 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &count);
1679 if (*err) {
1680 trace_9p_protocol_dump(clnt, &req->rc);
1681 p9_tag_remove(clnt, req);
1682 break;
1683 }
1684 if (rsize < count) {
1685 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize);
1686 count = rsize;
1687 }
1688
1689 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1690
1691 p9_tag_remove(clnt, req);
1692 iov_iter_advance(from, count);
1693 total += count;
1694 offset += count;
1695 }
1696 return total;
1697 }
1698 EXPORT_SYMBOL(p9_client_write);
1699
1700 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1701 {
1702 int err;
1703 struct p9_client *clnt;
1704 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1705 struct p9_req_t *req;
1706 u16 ignored;
1707
1708 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1709
1710 if (!ret)
1711 return ERR_PTR(-ENOMEM);
1712
1713 err = 0;
1714 clnt = fid->clnt;
1715
1716 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1717 if (IS_ERR(req)) {
1718 err = PTR_ERR(req);
1719 goto error;
1720 }
1721
1722 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret);
1723 if (err) {
1724 trace_9p_protocol_dump(clnt, &req->rc);
1725 p9_tag_remove(clnt, req);
1726 goto error;
1727 }
1728
1729 p9_debug(P9_DEBUG_9P,
1730 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1731 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1732 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1733 "<<< uid=%d gid=%d n_muid=%d\n",
1734 ret->size, ret->type, ret->dev, ret->qid.type,
1735 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1736 ret->atime, ret->mtime, (unsigned long long)ret->length,
1737 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1738 from_kuid(&init_user_ns, ret->n_uid),
1739 from_kgid(&init_user_ns, ret->n_gid),
1740 from_kuid(&init_user_ns, ret->n_muid));
1741
1742 p9_tag_remove(clnt, req);
1743 return ret;
1744
1745 error:
1746 kfree(ret);
1747 return ERR_PTR(err);
1748 }
1749 EXPORT_SYMBOL(p9_client_stat);
1750
1751 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1752 u64 request_mask)
1753 {
1754 int err;
1755 struct p9_client *clnt;
1756 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1757 GFP_KERNEL);
1758 struct p9_req_t *req;
1759
1760 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1761 fid->fid, request_mask);
1762
1763 if (!ret)
1764 return ERR_PTR(-ENOMEM);
1765
1766 err = 0;
1767 clnt = fid->clnt;
1768
1769 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1770 if (IS_ERR(req)) {
1771 err = PTR_ERR(req);
1772 goto error;
1773 }
1774
1775 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret);
1776 if (err) {
1777 trace_9p_protocol_dump(clnt, &req->rc);
1778 p9_tag_remove(clnt, req);
1779 goto error;
1780 }
1781
1782 p9_debug(P9_DEBUG_9P,
1783 "<<< RGETATTR st_result_mask=%lld\n"
1784 "<<< qid=%x.%llx.%x\n"
1785 "<<< st_mode=%8.8x st_nlink=%llu\n"
1786 "<<< st_uid=%d st_gid=%d\n"
1787 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1788 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1789 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1790 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1791 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1792 "<<< st_gen=%lld st_data_version=%lld\n",
1793 ret->st_result_mask, ret->qid.type, ret->qid.path,
1794 ret->qid.version, ret->st_mode, ret->st_nlink,
1795 from_kuid(&init_user_ns, ret->st_uid),
1796 from_kgid(&init_user_ns, ret->st_gid),
1797 ret->st_rdev, ret->st_size, ret->st_blksize,
1798 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1799 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1800 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1801 ret->st_gen, ret->st_data_version);
1802
1803 p9_tag_remove(clnt, req);
1804 return ret;
1805
1806 error:
1807 kfree(ret);
1808 return ERR_PTR(err);
1809 }
1810 EXPORT_SYMBOL(p9_client_getattr_dotl);
1811
1812 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1813 {
1814 int ret;
1815
1816 /* NOTE: size shouldn't include its own length */
1817 /* size[2] type[2] dev[4] qid[13] */
1818 /* mode[4] atime[4] mtime[4] length[8]*/
1819 /* name[s] uid[s] gid[s] muid[s] */
1820 ret = 2+4+13+4+4+4+8+2+2+2+2;
1821
1822 if (wst->name)
1823 ret += strlen(wst->name);
1824 if (wst->uid)
1825 ret += strlen(wst->uid);
1826 if (wst->gid)
1827 ret += strlen(wst->gid);
1828 if (wst->muid)
1829 ret += strlen(wst->muid);
1830
1831 if ((proto_version == p9_proto_2000u) ||
1832 (proto_version == p9_proto_2000L)) {
1833 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1834 if (wst->extension)
1835 ret += strlen(wst->extension);
1836 }
1837
1838 return ret;
1839 }
1840
1841 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1842 {
1843 int err;
1844 struct p9_req_t *req;
1845 struct p9_client *clnt;
1846
1847 err = 0;
1848 clnt = fid->clnt;
1849 wst->size = p9_client_statsize(wst, clnt->proto_version);
1850 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1851 p9_debug(P9_DEBUG_9P,
1852 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1853 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1854 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1855 " uid=%d gid=%d n_muid=%d\n",
1856 wst->size, wst->type, wst->dev, wst->qid.type,
1857 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1858 wst->atime, wst->mtime, (unsigned long long)wst->length,
1859 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1860 from_kuid(&init_user_ns, wst->n_uid),
1861 from_kgid(&init_user_ns, wst->n_gid),
1862 from_kuid(&init_user_ns, wst->n_muid));
1863
1864 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1865 if (IS_ERR(req)) {
1866 err = PTR_ERR(req);
1867 goto error;
1868 }
1869
1870 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1871
1872 p9_tag_remove(clnt, req);
1873 error:
1874 return err;
1875 }
1876 EXPORT_SYMBOL(p9_client_wstat);
1877
1878 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1879 {
1880 int err;
1881 struct p9_req_t *req;
1882 struct p9_client *clnt;
1883
1884 err = 0;
1885 clnt = fid->clnt;
1886 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1887 p9_debug(P9_DEBUG_9P,
1888 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1889 " atime_sec=%lld atime_nsec=%lld\n"
1890 " mtime_sec=%lld mtime_nsec=%lld\n",
1891 p9attr->valid, p9attr->mode,
1892 from_kuid(&init_user_ns, p9attr->uid),
1893 from_kgid(&init_user_ns, p9attr->gid),
1894 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1895 p9attr->mtime_sec, p9attr->mtime_nsec);
1896
1897 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1898
1899 if (IS_ERR(req)) {
1900 err = PTR_ERR(req);
1901 goto error;
1902 }
1903 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1904 p9_tag_remove(clnt, req);
1905 error:
1906 return err;
1907 }
1908 EXPORT_SYMBOL(p9_client_setattr);
1909
1910 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1911 {
1912 int err;
1913 struct p9_req_t *req;
1914 struct p9_client *clnt;
1915
1916 err = 0;
1917 clnt = fid->clnt;
1918
1919 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1920
1921 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1922 if (IS_ERR(req)) {
1923 err = PTR_ERR(req);
1924 goto error;
1925 }
1926
1927 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1928 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1929 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1930 if (err) {
1931 trace_9p_protocol_dump(clnt, &req->rc);
1932 p9_tag_remove(clnt, req);
1933 goto error;
1934 }
1935
1936 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1937 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1938 "fsid %llu namelen %ld\n",
1939 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1940 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1941 sb->fsid, (long int)sb->namelen);
1942
1943 p9_tag_remove(clnt, req);
1944 error:
1945 return err;
1946 }
1947 EXPORT_SYMBOL(p9_client_statfs);
1948
1949 int p9_client_rename(struct p9_fid *fid,
1950 struct p9_fid *newdirfid, const char *name)
1951 {
1952 int err;
1953 struct p9_req_t *req;
1954 struct p9_client *clnt;
1955
1956 err = 0;
1957 clnt = fid->clnt;
1958
1959 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1960 fid->fid, newdirfid->fid, name);
1961
1962 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1963 newdirfid->fid, name);
1964 if (IS_ERR(req)) {
1965 err = PTR_ERR(req);
1966 goto error;
1967 }
1968
1969 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1970
1971 p9_tag_remove(clnt, req);
1972 error:
1973 return err;
1974 }
1975 EXPORT_SYMBOL(p9_client_rename);
1976
1977 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1978 struct p9_fid *newdirfid, const char *new_name)
1979 {
1980 int err;
1981 struct p9_req_t *req;
1982 struct p9_client *clnt;
1983
1984 err = 0;
1985 clnt = olddirfid->clnt;
1986
1987 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1988 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1989 newdirfid->fid, new_name);
1990
1991 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1992 old_name, newdirfid->fid, new_name);
1993 if (IS_ERR(req)) {
1994 err = PTR_ERR(req);
1995 goto error;
1996 }
1997
1998 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1999 newdirfid->fid, new_name);
2000
2001 p9_tag_remove(clnt, req);
2002 error:
2003 return err;
2004 }
2005 EXPORT_SYMBOL(p9_client_renameat);
2006
2007 /*
2008 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
2009 */
2010 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
2011 const char *attr_name, u64 *attr_size)
2012 {
2013 int err;
2014 struct p9_req_t *req;
2015 struct p9_client *clnt;
2016 struct p9_fid *attr_fid;
2017
2018 err = 0;
2019 clnt = file_fid->clnt;
2020 attr_fid = p9_fid_create(clnt);
2021 if (!attr_fid) {
2022 err = -ENOMEM;
2023 goto error;
2024 }
2025 p9_debug(P9_DEBUG_9P,
2026 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2027 file_fid->fid, attr_fid->fid, attr_name);
2028
2029 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2030 file_fid->fid, attr_fid->fid, attr_name);
2031 if (IS_ERR(req)) {
2032 err = PTR_ERR(req);
2033 goto error;
2034 }
2035 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size);
2036 if (err) {
2037 trace_9p_protocol_dump(clnt, &req->rc);
2038 p9_tag_remove(clnt, req);
2039 goto clunk_fid;
2040 }
2041 p9_tag_remove(clnt, req);
2042 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2043 attr_fid->fid, *attr_size);
2044 return attr_fid;
2045 clunk_fid:
2046 p9_client_clunk(attr_fid);
2047 attr_fid = NULL;
2048 error:
2049 if (attr_fid && (attr_fid != file_fid))
2050 p9_fid_destroy(attr_fid);
2051
2052 return ERR_PTR(err);
2053 }
2054 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2055
2056 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2057 u64 attr_size, int flags)
2058 {
2059 int err;
2060 struct p9_req_t *req;
2061 struct p9_client *clnt;
2062
2063 p9_debug(P9_DEBUG_9P,
2064 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2065 fid->fid, name, (long long)attr_size, flags);
2066 err = 0;
2067 clnt = fid->clnt;
2068 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2069 fid->fid, name, attr_size, flags);
2070 if (IS_ERR(req)) {
2071 err = PTR_ERR(req);
2072 goto error;
2073 }
2074 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2075 p9_tag_remove(clnt, req);
2076 error:
2077 return err;
2078 }
2079 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2080
2081 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2082 {
2083 int err, rsize, non_zc = 0;
2084 struct p9_client *clnt;
2085 struct p9_req_t *req;
2086 char *dataptr;
2087 struct kvec kv = {.iov_base = data, .iov_len = count};
2088 struct iov_iter to;
2089
2090 iov_iter_kvec(&to, READ, &kv, 1, count);
2091
2092 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2093 fid->fid, (unsigned long long) offset, count);
2094
2095 err = 0;
2096 clnt = fid->clnt;
2097
2098 rsize = fid->iounit;
2099 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2100 rsize = clnt->msize - P9_READDIRHDRSZ;
2101
2102 if (count < rsize)
2103 rsize = count;
2104
2105 /* Don't bother zerocopy for small IO (< 1024) */
2106 if (clnt->trans_mod->zc_request && rsize > 1024) {
2107 /*
2108 * response header len is 11
2109 * PDU Header(7) + IO Size (4)
2110 */
2111 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0,
2112 11, "dqd", fid->fid, offset, rsize);
2113 } else {
2114 non_zc = 1;
2115 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2116 offset, rsize);
2117 }
2118 if (IS_ERR(req)) {
2119 err = PTR_ERR(req);
2120 goto error;
2121 }
2122
2123 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr);
2124 if (err) {
2125 trace_9p_protocol_dump(clnt, &req->rc);
2126 goto free_and_error;
2127 }
2128 if (rsize < count) {
2129 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize);
2130 count = rsize;
2131 }
2132
2133 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2134
2135 if (non_zc)
2136 memmove(data, dataptr, count);
2137
2138 p9_tag_remove(clnt, req);
2139 return count;
2140
2141 free_and_error:
2142 p9_tag_remove(clnt, req);
2143 error:
2144 return err;
2145 }
2146 EXPORT_SYMBOL(p9_client_readdir);
2147
2148 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode,
2149 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2150 {
2151 int err;
2152 struct p9_client *clnt;
2153 struct p9_req_t *req;
2154
2155 err = 0;
2156 clnt = fid->clnt;
2157 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2158 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2159 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2160 MAJOR(rdev), MINOR(rdev), gid);
2161 if (IS_ERR(req))
2162 return PTR_ERR(req);
2163
2164 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
2165 if (err) {
2166 trace_9p_protocol_dump(clnt, &req->rc);
2167 goto error;
2168 }
2169 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2170 (unsigned long long)qid->path, qid->version);
2171
2172 error:
2173 p9_tag_remove(clnt, req);
2174 return err;
2175
2176 }
2177 EXPORT_SYMBOL(p9_client_mknod_dotl);
2178
2179 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode,
2180 kgid_t gid, struct p9_qid *qid)
2181 {
2182 int err;
2183 struct p9_client *clnt;
2184 struct p9_req_t *req;
2185
2186 err = 0;
2187 clnt = fid->clnt;
2188 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2189 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2190 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
2191 gid);
2192 if (IS_ERR(req))
2193 return PTR_ERR(req);
2194
2195 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
2196 if (err) {
2197 trace_9p_protocol_dump(clnt, &req->rc);
2198 goto error;
2199 }
2200 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2201 (unsigned long long)qid->path, qid->version);
2202
2203 error:
2204 p9_tag_remove(clnt, req);
2205 return err;
2206
2207 }
2208 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2209
2210 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2211 {
2212 int err;
2213 struct p9_client *clnt;
2214 struct p9_req_t *req;
2215
2216 err = 0;
2217 clnt = fid->clnt;
2218 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2219 "start %lld length %lld proc_id %d client_id %s\n",
2220 fid->fid, flock->type, flock->flags, flock->start,
2221 flock->length, flock->proc_id, flock->client_id);
2222
2223 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2224 flock->flags, flock->start, flock->length,
2225 flock->proc_id, flock->client_id);
2226
2227 if (IS_ERR(req))
2228 return PTR_ERR(req);
2229
2230 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status);
2231 if (err) {
2232 trace_9p_protocol_dump(clnt, &req->rc);
2233 goto error;
2234 }
2235 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2236 error:
2237 p9_tag_remove(clnt, req);
2238 return err;
2239
2240 }
2241 EXPORT_SYMBOL(p9_client_lock_dotl);
2242
2243 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2244 {
2245 int err;
2246 struct p9_client *clnt;
2247 struct p9_req_t *req;
2248
2249 err = 0;
2250 clnt = fid->clnt;
2251 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2252 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2253 glock->start, glock->length, glock->proc_id, glock->client_id);
2254
2255 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2256 glock->start, glock->length, glock->proc_id, glock->client_id);
2257
2258 if (IS_ERR(req))
2259 return PTR_ERR(req);
2260
2261 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type,
2262 &glock->start, &glock->length, &glock->proc_id,
2263 &glock->client_id);
2264 if (err) {
2265 trace_9p_protocol_dump(clnt, &req->rc);
2266 goto error;
2267 }
2268 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2269 "proc_id %d client_id %s\n", glock->type, glock->start,
2270 glock->length, glock->proc_id, glock->client_id);
2271 error:
2272 p9_tag_remove(clnt, req);
2273 return err;
2274 }
2275 EXPORT_SYMBOL(p9_client_getlock_dotl);
2276
2277 int p9_client_readlink(struct p9_fid *fid, char **target)
2278 {
2279 int err;
2280 struct p9_client *clnt;
2281 struct p9_req_t *req;
2282
2283 err = 0;
2284 clnt = fid->clnt;
2285 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2286
2287 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2288 if (IS_ERR(req))
2289 return PTR_ERR(req);
2290
2291 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target);
2292 if (err) {
2293 trace_9p_protocol_dump(clnt, &req->rc);
2294 goto error;
2295 }
2296 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2297 error:
2298 p9_tag_remove(clnt, req);
2299 return err;
2300 }
2301 EXPORT_SYMBOL(p9_client_readlink);
2302
2303 int __init p9_client_init(void)
2304 {
2305 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU);
2306 return p9_req_cache ? 0 : -ENOMEM;
2307 }
2308
2309 void __exit p9_client_exit(void)
2310 {
2311 kmem_cache_destroy(p9_req_cache);
2312 }
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