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