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Linux 5.7.7
[linux/fpc-iii.git] / net / 9p / client.c
blobfc1f3635e5dd18c9c732cd2cf1436493e5448782
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 *
418 */
419 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
420 {
421 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag);
422
423 /*
424 * This barrier is needed to make sure any change made to req before
425 * the status change is visible to another thread
426 */
427 smp_wmb();
428 req->status = status;
429
430 wake_up(&req->wq);
431 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag);
432 p9_req_put(req);
433 }
434 EXPORT_SYMBOL(p9_client_cb);
435
436 /**
437 * p9_parse_header - parse header arguments out of a packet
438 * @pdu: packet to parse
439 * @size: size of packet
440 * @type: type of request
441 * @tag: tag of packet
442 * @rewind: set if we need to rewind offset afterwards
443 */
444
445 int
446 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
447 int rewind)
448 {
449 int8_t r_type;
450 int16_t r_tag;
451 int32_t r_size;
452 int offset = pdu->offset;
453 int err;
454
455 pdu->offset = 0;
456
457 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
458 if (err)
459 goto rewind_and_exit;
460
461 if (type)
462 *type = r_type;
463 if (tag)
464 *tag = r_tag;
465 if (size)
466 *size = r_size;
467
468 if (pdu->size != r_size || r_size < 7) {
469 err = -EINVAL;
470 goto rewind_and_exit;
471 }
472
473 pdu->id = r_type;
474 pdu->tag = r_tag;
475
476 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
477 pdu->size, pdu->id, pdu->tag);
478
479 rewind_and_exit:
480 if (rewind)
481 pdu->offset = offset;
482 return err;
483 }
484 EXPORT_SYMBOL(p9_parse_header);
485
486 /**
487 * p9_check_errors - check 9p packet for error return and process it
488 * @c: current client instance
489 * @req: request to parse and check for error conditions
490 *
491 * returns error code if one is discovered, otherwise returns 0
492 *
493 * this will have to be more complicated if we have multiple
494 * error packet types
495 */
496
497 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
498 {
499 int8_t type;
500 int err;
501 int ecode;
502
503 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0);
504 if (req->rc.size >= c->msize) {
505 p9_debug(P9_DEBUG_ERROR,
506 "requested packet size too big: %d\n",
507 req->rc.size);
508 return -EIO;
509 }
510 /*
511 * dump the response from server
512 * This should be after check errors which poplulate pdu_fcall.
513 */
514 trace_9p_protocol_dump(c, &req->rc);
515 if (err) {
516 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
517 return err;
518 }
519 if (type != P9_RERROR && type != P9_RLERROR)
520 return 0;
521
522 if (!p9_is_proto_dotl(c)) {
523 char *ename;
524 err = p9pdu_readf(&req->rc, c->proto_version, "s?d",
525 &ename, &ecode);
526 if (err)
527 goto out_err;
528
529 if (p9_is_proto_dotu(c) && ecode < 512)
530 err = -ecode;
531
532 if (!err) {
533 err = p9_errstr2errno(ename, strlen(ename));
534
535 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
536 -ecode, ename);
537 }
538 kfree(ename);
539 } else {
540 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode);
541 err = -ecode;
542
543 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
544 }
545
546 return err;
547
548 out_err:
549 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
550
551 return err;
552 }
553
554 /**
555 * p9_check_zc_errors - check 9p packet for error return and process it
556 * @c: current client instance
557 * @req: request to parse and check for error conditions
558 * @in_hdrlen: Size of response protocol buffer.
559 *
560 * returns error code if one is discovered, otherwise returns 0
561 *
562 * this will have to be more complicated if we have multiple
563 * error packet types
564 */
565
566 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
567 struct iov_iter *uidata, int in_hdrlen)
568 {
569 int err;
570 int ecode;
571 int8_t type;
572 char *ename = NULL;
573
574 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0);
575 /*
576 * dump the response from server
577 * This should be after parse_header which poplulate pdu_fcall.
578 */
579 trace_9p_protocol_dump(c, &req->rc);
580 if (err) {
581 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
582 return err;
583 }
584
585 if (type != P9_RERROR && type != P9_RLERROR)
586 return 0;
587
588 if (!p9_is_proto_dotl(c)) {
589 /* Error is reported in string format */
590 int len;
591 /* 7 = header size for RERROR; */
592 int inline_len = in_hdrlen - 7;
593
594 len = req->rc.size - req->rc.offset;
595 if (len > (P9_ZC_HDR_SZ - 7)) {
596 err = -EFAULT;
597 goto out_err;
598 }
599
600 ename = &req->rc.sdata[req->rc.offset];
601 if (len > inline_len) {
602 /* We have error in external buffer */
603 if (!copy_from_iter_full(ename + inline_len,
604 len - inline_len, uidata)) {
605 err = -EFAULT;
606 goto out_err;
607 }
608 }
609 ename = NULL;
610 err = p9pdu_readf(&req->rc, c->proto_version, "s?d",
611 &ename, &ecode);
612 if (err)
613 goto out_err;
614
615 if (p9_is_proto_dotu(c) && ecode < 512)
616 err = -ecode;
617
618 if (!err) {
619 err = p9_errstr2errno(ename, strlen(ename));
620
621 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
622 -ecode, ename);
623 }
624 kfree(ename);
625 } else {
626 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode);
627 err = -ecode;
628
629 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
630 }
631 return err;
632
633 out_err:
634 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
635 return err;
636 }
637
638 static struct p9_req_t *
639 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
640
641 /**
642 * p9_client_flush - flush (cancel) a request
643 * @c: client state
644 * @oldreq: request to cancel
645 *
646 * This sents a flush for a particular request and links
647 * the flush request to the original request. The current
648 * code only supports a single flush request although the protocol
649 * allows for multiple flush requests to be sent for a single request.
650 *
651 */
652
653 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
654 {
655 struct p9_req_t *req;
656 int16_t oldtag;
657 int err;
658
659 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1);
660 if (err)
661 return err;
662
663 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
664
665 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
666 if (IS_ERR(req))
667 return PTR_ERR(req);
668
669 /*
670 * if we haven't received a response for oldreq,
671 * remove it from the list
672 */
673 if (oldreq->status == REQ_STATUS_SENT) {
674 if (c->trans_mod->cancelled)
675 c->trans_mod->cancelled(c, oldreq);
676 }
677
678 p9_tag_remove(c, req);
679 return 0;
680 }
681
682 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
683 int8_t type, int req_size,
684 const char *fmt, va_list ap)
685 {
686 int err;
687 struct p9_req_t *req;
688
689 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
690
691 /* we allow for any status other than disconnected */
692 if (c->status == Disconnected)
693 return ERR_PTR(-EIO);
694
695 /* if status is begin_disconnected we allow only clunk request */
696 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
697 return ERR_PTR(-EIO);
698
699 req = p9_tag_alloc(c, type, req_size);
700 if (IS_ERR(req))
701 return req;
702
703 /* marshall the data */
704 p9pdu_prepare(&req->tc, req->tc.tag, type);
705 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap);
706 if (err)
707 goto reterr;
708 p9pdu_finalize(c, &req->tc);
709 trace_9p_client_req(c, type, req->tc.tag);
710 return req;
711 reterr:
712 p9_tag_remove(c, req);
713 /* We have to put also the 2nd reference as it won't be used */
714 p9_req_put(req);
715 return ERR_PTR(err);
716 }
717
718 /**
719 * p9_client_rpc - issue a request and wait for a response
720 * @c: client session
721 * @type: type of request
722 * @fmt: protocol format string (see protocol.c)
723 *
724 * Returns request structure (which client must free using p9_tag_remove)
725 */
726
727 static struct p9_req_t *
728 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
729 {
730 va_list ap;
731 int sigpending, err;
732 unsigned long flags;
733 struct p9_req_t *req;
734
735 va_start(ap, fmt);
736 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
737 va_end(ap);
738 if (IS_ERR(req))
739 return req;
740
741 if (signal_pending(current)) {
742 sigpending = 1;
743 clear_thread_flag(TIF_SIGPENDING);
744 } else
745 sigpending = 0;
746
747 err = c->trans_mod->request(c, req);
748 if (err < 0) {
749 /* write won't happen */
750 p9_req_put(req);
751 if (err != -ERESTARTSYS && err != -EFAULT)
752 c->status = Disconnected;
753 goto recalc_sigpending;
754 }
755 again:
756 /* Wait for the response */
757 err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD);
758
759 /*
760 * Make sure our req is coherent with regard to updates in other
761 * threads - echoes to wmb() in the callback
762 */
763 smp_rmb();
764
765 if ((err == -ERESTARTSYS) && (c->status == Connected)
766 && (type == P9_TFLUSH)) {
767 sigpending = 1;
768 clear_thread_flag(TIF_SIGPENDING);
769 goto again;
770 }
771
772 if (req->status == REQ_STATUS_ERROR) {
773 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
774 err = req->t_err;
775 }
776 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
777 p9_debug(P9_DEBUG_MUX, "flushing\n");
778 sigpending = 1;
779 clear_thread_flag(TIF_SIGPENDING);
780
781 if (c->trans_mod->cancel(c, req))
782 p9_client_flush(c, req);
783
784 /* if we received the response anyway, don't signal error */
785 if (req->status == REQ_STATUS_RCVD)
786 err = 0;
787 }
788 recalc_sigpending:
789 if (sigpending) {
790 spin_lock_irqsave(&current->sighand->siglock, flags);
791 recalc_sigpending();
792 spin_unlock_irqrestore(&current->sighand->siglock, flags);
793 }
794 if (err < 0)
795 goto reterr;
796
797 err = p9_check_errors(c, req);
798 trace_9p_client_res(c, type, req->rc.tag, err);
799 if (!err)
800 return req;
801 reterr:
802 p9_tag_remove(c, req);
803 return ERR_PTR(safe_errno(err));
804 }
805
806 /**
807 * p9_client_zc_rpc - issue a request and wait for a response
808 * @c: client session
809 * @type: type of request
810 * @uidata: destination for zero copy read
811 * @uodata: source for zero copy write
812 * @inlen: read buffer size
813 * @olen: write buffer size
814 * @hdrlen: reader header size, This is the size of response protocol data
815 * @fmt: protocol format string (see protocol.c)
816 *
817 * Returns request structure (which client must free using p9_tag_remove)
818 */
819 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
820 struct iov_iter *uidata,
821 struct iov_iter *uodata,
822 int inlen, int olen, int in_hdrlen,
823 const char *fmt, ...)
824 {
825 va_list ap;
826 int sigpending, err;
827 unsigned long flags;
828 struct p9_req_t *req;
829
830 va_start(ap, fmt);
831 /*
832 * We allocate a inline protocol data of only 4k bytes.
833 * The actual content is passed in zero-copy fashion.
834 */
835 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
836 va_end(ap);
837 if (IS_ERR(req))
838 return req;
839
840 if (signal_pending(current)) {
841 sigpending = 1;
842 clear_thread_flag(TIF_SIGPENDING);
843 } else
844 sigpending = 0;
845
846 err = c->trans_mod->zc_request(c, req, uidata, uodata,
847 inlen, olen, in_hdrlen);
848 if (err < 0) {
849 if (err == -EIO)
850 c->status = Disconnected;
851 if (err != -ERESTARTSYS)
852 goto recalc_sigpending;
853 }
854 if (req->status == REQ_STATUS_ERROR) {
855 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
856 err = req->t_err;
857 }
858 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
859 p9_debug(P9_DEBUG_MUX, "flushing\n");
860 sigpending = 1;
861 clear_thread_flag(TIF_SIGPENDING);
862
863 if (c->trans_mod->cancel(c, req))
864 p9_client_flush(c, req);
865
866 /* if we received the response anyway, don't signal error */
867 if (req->status == REQ_STATUS_RCVD)
868 err = 0;
869 }
870 recalc_sigpending:
871 if (sigpending) {
872 spin_lock_irqsave(&current->sighand->siglock, flags);
873 recalc_sigpending();
874 spin_unlock_irqrestore(&current->sighand->siglock, flags);
875 }
876 if (err < 0)
877 goto reterr;
878
879 err = p9_check_zc_errors(c, req, uidata, in_hdrlen);
880 trace_9p_client_res(c, type, req->rc.tag, err);
881 if (!err)
882 return req;
883 reterr:
884 p9_tag_remove(c, req);
885 return ERR_PTR(safe_errno(err));
886 }
887
888 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
889 {
890 int ret;
891 struct p9_fid *fid;
892
893 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
894 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
895 if (!fid)
896 return NULL;
897
898 memset(&fid->qid, 0, sizeof(struct p9_qid));
899 fid->mode = -1;
900 fid->uid = current_fsuid();
901 fid->clnt = clnt;
902 fid->rdir = NULL;
903 fid->fid = 0;
904
905 idr_preload(GFP_KERNEL);
906 spin_lock_irq(&clnt->lock);
907 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1,
908 GFP_NOWAIT);
909 spin_unlock_irq(&clnt->lock);
910 idr_preload_end();
911
912 if (!ret)
913 return fid;
914
915 kfree(fid);
916 return NULL;
917 }
918
919 static void p9_fid_destroy(struct p9_fid *fid)
920 {
921 struct p9_client *clnt;
922 unsigned long flags;
923
924 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
925 clnt = fid->clnt;
926 spin_lock_irqsave(&clnt->lock, flags);
927 idr_remove(&clnt->fids, fid->fid);
928 spin_unlock_irqrestore(&clnt->lock, flags);
929 kfree(fid->rdir);
930 kfree(fid);
931 }
932
933 static int p9_client_version(struct p9_client *c)
934 {
935 int err = 0;
936 struct p9_req_t *req;
937 char *version = NULL;
938 int msize;
939
940 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
941 c->msize, c->proto_version);
942
943 switch (c->proto_version) {
944 case p9_proto_2000L:
945 req = p9_client_rpc(c, P9_TVERSION, "ds",
946 c->msize, "9P2000.L");
947 break;
948 case p9_proto_2000u:
949 req = p9_client_rpc(c, P9_TVERSION, "ds",
950 c->msize, "9P2000.u");
951 break;
952 case p9_proto_legacy:
953 req = p9_client_rpc(c, P9_TVERSION, "ds",
954 c->msize, "9P2000");
955 break;
956 default:
957 return -EINVAL;
958 }
959
960 if (IS_ERR(req))
961 return PTR_ERR(req);
962
963 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version);
964 if (err) {
965 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
966 trace_9p_protocol_dump(c, &req->rc);
967 goto error;
968 }
969
970 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
971 if (!strncmp(version, "9P2000.L", 8))
972 c->proto_version = p9_proto_2000L;
973 else if (!strncmp(version, "9P2000.u", 8))
974 c->proto_version = p9_proto_2000u;
975 else if (!strncmp(version, "9P2000", 6))
976 c->proto_version = p9_proto_legacy;
977 else {
978 p9_debug(P9_DEBUG_ERROR,
979 "server returned an unknown version: %s\n", version);
980 err = -EREMOTEIO;
981 goto error;
982 }
983
984 if (msize < 4096) {
985 p9_debug(P9_DEBUG_ERROR,
986 "server returned a msize < 4096: %d\n", msize);
987 err = -EREMOTEIO;
988 goto error;
989 }
990 if (msize < c->msize)
991 c->msize = msize;
992
993 error:
994 kfree(version);
995 p9_tag_remove(c, req);
996
997 return err;
998 }
999
1000 struct p9_client *p9_client_create(const char *dev_name, char *options)
1001 {
1002 int err;
1003 struct p9_client *clnt;
1004 char *client_id;
1005
1006 err = 0;
1007 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
1008 if (!clnt)
1009 return ERR_PTR(-ENOMEM);
1010
1011 clnt->trans_mod = NULL;
1012 clnt->trans = NULL;
1013 clnt->fcall_cache = NULL;
1014
1015 client_id = utsname()->nodename;
1016 memcpy(clnt->name, client_id, strlen(client_id) + 1);
1017
1018 spin_lock_init(&clnt->lock);
1019 idr_init(&clnt->fids);
1020 idr_init(&clnt->reqs);
1021
1022 err = parse_opts(options, clnt);
1023 if (err < 0)
1024 goto free_client;
1025
1026 if (!clnt->trans_mod)
1027 clnt->trans_mod = v9fs_get_default_trans();
1028
1029 if (clnt->trans_mod == NULL) {
1030 err = -EPROTONOSUPPORT;
1031 p9_debug(P9_DEBUG_ERROR,
1032 "No transport defined or default transport\n");
1033 goto free_client;
1034 }
1035
1036 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1037 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1038
1039 err = clnt->trans_mod->create(clnt, dev_name, options);
1040 if (err)
1041 goto put_trans;
1042
1043 if (clnt->msize > clnt->trans_mod->maxsize)
1044 clnt->msize = clnt->trans_mod->maxsize;
1045
1046 if (clnt->msize < 4096) {
1047 p9_debug(P9_DEBUG_ERROR,
1048 "Please specify a msize of at least 4k\n");
1049 err = -EINVAL;
1050 goto close_trans;
1051 }
1052
1053 err = p9_client_version(clnt);
1054 if (err)
1055 goto close_trans;
1056
1057 /* P9_HDRSZ + 4 is the smallest packet header we can have that is
1058 * followed by data accessed from userspace by read
1059 */
1060 clnt->fcall_cache =
1061 kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize,
1062 0, 0, P9_HDRSZ + 4,
1063 clnt->msize - (P9_HDRSZ + 4),
1064 NULL);
1065
1066 return clnt;
1067
1068 close_trans:
1069 clnt->trans_mod->close(clnt);
1070 put_trans:
1071 v9fs_put_trans(clnt->trans_mod);
1072 free_client:
1073 kfree(clnt);
1074 return ERR_PTR(err);
1075 }
1076 EXPORT_SYMBOL(p9_client_create);
1077
1078 void p9_client_destroy(struct p9_client *clnt)
1079 {
1080 struct p9_fid *fid;
1081 int id;
1082
1083 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1084
1085 if (clnt->trans_mod)
1086 clnt->trans_mod->close(clnt);
1087
1088 v9fs_put_trans(clnt->trans_mod);
1089
1090 idr_for_each_entry(&clnt->fids, fid, id) {
1091 pr_info("Found fid %d not clunked\n", fid->fid);
1092 p9_fid_destroy(fid);
1093 }
1094
1095 p9_tag_cleanup(clnt);
1096
1097 kmem_cache_destroy(clnt->fcall_cache);
1098 kfree(clnt);
1099 }
1100 EXPORT_SYMBOL(p9_client_destroy);
1101
1102 void p9_client_disconnect(struct p9_client *clnt)
1103 {
1104 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1105 clnt->status = Disconnected;
1106 }
1107 EXPORT_SYMBOL(p9_client_disconnect);
1108
1109 void p9_client_begin_disconnect(struct p9_client *clnt)
1110 {
1111 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1112 clnt->status = BeginDisconnect;
1113 }
1114 EXPORT_SYMBOL(p9_client_begin_disconnect);
1115
1116 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1117 const char *uname, kuid_t n_uname, const char *aname)
1118 {
1119 int err = 0;
1120 struct p9_req_t *req;
1121 struct p9_fid *fid;
1122 struct p9_qid qid;
1123
1124
1125 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1126 afid ? afid->fid : -1, uname, aname);
1127 fid = p9_fid_create(clnt);
1128 if (!fid) {
1129 err = -ENOMEM;
1130 goto error;
1131 }
1132 fid->uid = n_uname;
1133
1134 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1135 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1136 if (IS_ERR(req)) {
1137 err = PTR_ERR(req);
1138 goto error;
1139 }
1140
1141 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid);
1142 if (err) {
1143 trace_9p_protocol_dump(clnt, &req->rc);
1144 p9_tag_remove(clnt, req);
1145 goto error;
1146 }
1147
1148 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1149 qid.type, (unsigned long long)qid.path, qid.version);
1150
1151 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1152
1153 p9_tag_remove(clnt, req);
1154 return fid;
1155
1156 error:
1157 if (fid)
1158 p9_fid_destroy(fid);
1159 return ERR_PTR(err);
1160 }
1161 EXPORT_SYMBOL(p9_client_attach);
1162
1163 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1164 const unsigned char * const *wnames, int clone)
1165 {
1166 int err;
1167 struct p9_client *clnt;
1168 struct p9_fid *fid;
1169 struct p9_qid *wqids;
1170 struct p9_req_t *req;
1171 uint16_t nwqids, count;
1172
1173 err = 0;
1174 wqids = NULL;
1175 clnt = oldfid->clnt;
1176 if (clone) {
1177 fid = p9_fid_create(clnt);
1178 if (!fid) {
1179 err = -ENOMEM;
1180 goto error;
1181 }
1182
1183 fid->uid = oldfid->uid;
1184 } else
1185 fid = oldfid;
1186
1187
1188 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1189 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1190
1191 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1192 nwname, wnames);
1193 if (IS_ERR(req)) {
1194 err = PTR_ERR(req);
1195 goto error;
1196 }
1197
1198 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1199 if (err) {
1200 trace_9p_protocol_dump(clnt, &req->rc);
1201 p9_tag_remove(clnt, req);
1202 goto clunk_fid;
1203 }
1204 p9_tag_remove(clnt, req);
1205
1206 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1207
1208 if (nwqids != nwname) {
1209 err = -ENOENT;
1210 goto clunk_fid;
1211 }
1212
1213 for (count = 0; count < nwqids; count++)
1214 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1215 count, wqids[count].type,
1216 (unsigned long long)wqids[count].path,
1217 wqids[count].version);
1218
1219 if (nwname)
1220 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1221 else
1222 fid->qid = oldfid->qid;
1223
1224 kfree(wqids);
1225 return fid;
1226
1227 clunk_fid:
1228 kfree(wqids);
1229 p9_client_clunk(fid);
1230 fid = NULL;
1231
1232 error:
1233 if (fid && (fid != oldfid))
1234 p9_fid_destroy(fid);
1235
1236 return ERR_PTR(err);
1237 }
1238 EXPORT_SYMBOL(p9_client_walk);
1239
1240 int p9_client_open(struct p9_fid *fid, int mode)
1241 {
1242 int err;
1243 struct p9_client *clnt;
1244 struct p9_req_t *req;
1245 struct p9_qid qid;
1246 int iounit;
1247
1248 clnt = fid->clnt;
1249 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1250 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1251 err = 0;
1252
1253 if (fid->mode != -1)
1254 return -EINVAL;
1255
1256 if (p9_is_proto_dotl(clnt))
1257 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1258 else
1259 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1260 if (IS_ERR(req)) {
1261 err = PTR_ERR(req);
1262 goto error;
1263 }
1264
1265 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1266 if (err) {
1267 trace_9p_protocol_dump(clnt, &req->rc);
1268 goto free_and_error;
1269 }
1270
1271 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1272 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1273 (unsigned long long)qid.path, qid.version, iounit);
1274
1275 fid->mode = mode;
1276 fid->iounit = iounit;
1277
1278 free_and_error:
1279 p9_tag_remove(clnt, req);
1280 error:
1281 return err;
1282 }
1283 EXPORT_SYMBOL(p9_client_open);
1284
1285 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode,
1286 kgid_t gid, struct p9_qid *qid)
1287 {
1288 int err = 0;
1289 struct p9_client *clnt;
1290 struct p9_req_t *req;
1291 int iounit;
1292
1293 p9_debug(P9_DEBUG_9P,
1294 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1295 ofid->fid, name, flags, mode,
1296 from_kgid(&init_user_ns, gid));
1297 clnt = ofid->clnt;
1298
1299 if (ofid->mode != -1)
1300 return -EINVAL;
1301
1302 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1303 mode, gid);
1304 if (IS_ERR(req)) {
1305 err = PTR_ERR(req);
1306 goto error;
1307 }
1308
1309 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit);
1310 if (err) {
1311 trace_9p_protocol_dump(clnt, &req->rc);
1312 goto free_and_error;
1313 }
1314
1315 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1316 qid->type,
1317 (unsigned long long)qid->path,
1318 qid->version, iounit);
1319
1320 ofid->mode = mode;
1321 ofid->iounit = iounit;
1322
1323 free_and_error:
1324 p9_tag_remove(clnt, req);
1325 error:
1326 return err;
1327 }
1328 EXPORT_SYMBOL(p9_client_create_dotl);
1329
1330 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode,
1331 char *extension)
1332 {
1333 int err;
1334 struct p9_client *clnt;
1335 struct p9_req_t *req;
1336 struct p9_qid qid;
1337 int iounit;
1338
1339 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1340 fid->fid, name, perm, mode);
1341 err = 0;
1342 clnt = fid->clnt;
1343
1344 if (fid->mode != -1)
1345 return -EINVAL;
1346
1347 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1348 mode, extension);
1349 if (IS_ERR(req)) {
1350 err = PTR_ERR(req);
1351 goto error;
1352 }
1353
1354 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1355 if (err) {
1356 trace_9p_protocol_dump(clnt, &req->rc);
1357 goto free_and_error;
1358 }
1359
1360 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1361 qid.type,
1362 (unsigned long long)qid.path,
1363 qid.version, iounit);
1364
1365 fid->mode = mode;
1366 fid->iounit = iounit;
1367
1368 free_and_error:
1369 p9_tag_remove(clnt, req);
1370 error:
1371 return err;
1372 }
1373 EXPORT_SYMBOL(p9_client_fcreate);
1374
1375 int p9_client_symlink(struct p9_fid *dfid, const char *name,
1376 const char *symtgt, kgid_t gid, struct p9_qid *qid)
1377 {
1378 int err = 0;
1379 struct p9_client *clnt;
1380 struct p9_req_t *req;
1381
1382 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1383 dfid->fid, name, symtgt);
1384 clnt = dfid->clnt;
1385
1386 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1387 gid);
1388 if (IS_ERR(req)) {
1389 err = PTR_ERR(req);
1390 goto error;
1391 }
1392
1393 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
1394 if (err) {
1395 trace_9p_protocol_dump(clnt, &req->rc);
1396 goto free_and_error;
1397 }
1398
1399 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1400 qid->type, (unsigned long long)qid->path, qid->version);
1401
1402 free_and_error:
1403 p9_tag_remove(clnt, req);
1404 error:
1405 return err;
1406 }
1407 EXPORT_SYMBOL(p9_client_symlink);
1408
1409 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname)
1410 {
1411 struct p9_client *clnt;
1412 struct p9_req_t *req;
1413
1414 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1415 dfid->fid, oldfid->fid, newname);
1416 clnt = dfid->clnt;
1417 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1418 newname);
1419 if (IS_ERR(req))
1420 return PTR_ERR(req);
1421
1422 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1423 p9_tag_remove(clnt, req);
1424 return 0;
1425 }
1426 EXPORT_SYMBOL(p9_client_link);
1427
1428 int p9_client_fsync(struct p9_fid *fid, int datasync)
1429 {
1430 int err;
1431 struct p9_client *clnt;
1432 struct p9_req_t *req;
1433
1434 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1435 fid->fid, datasync);
1436 err = 0;
1437 clnt = fid->clnt;
1438
1439 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1440 if (IS_ERR(req)) {
1441 err = PTR_ERR(req);
1442 goto error;
1443 }
1444
1445 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1446
1447 p9_tag_remove(clnt, req);
1448
1449 error:
1450 return err;
1451 }
1452 EXPORT_SYMBOL(p9_client_fsync);
1453
1454 int p9_client_clunk(struct p9_fid *fid)
1455 {
1456 int err;
1457 struct p9_client *clnt;
1458 struct p9_req_t *req;
1459 int retries = 0;
1460
1461 if (!fid) {
1462 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1463 __func__, task_pid_nr(current));
1464 dump_stack();
1465 return 0;
1466 }
1467
1468 again:
1469 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1470 retries);
1471 err = 0;
1472 clnt = fid->clnt;
1473
1474 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1475 if (IS_ERR(req)) {
1476 err = PTR_ERR(req);
1477 goto error;
1478 }
1479
1480 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1481
1482 p9_tag_remove(clnt, req);
1483 error:
1484 /*
1485 * Fid is not valid even after a failed clunk
1486 * If interrupted, retry once then give up and
1487 * leak fid until umount.
1488 */
1489 if (err == -ERESTARTSYS) {
1490 if (retries++ == 0)
1491 goto again;
1492 } else
1493 p9_fid_destroy(fid);
1494 return err;
1495 }
1496 EXPORT_SYMBOL(p9_client_clunk);
1497
1498 int p9_client_remove(struct p9_fid *fid)
1499 {
1500 int err;
1501 struct p9_client *clnt;
1502 struct p9_req_t *req;
1503
1504 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1505 err = 0;
1506 clnt = fid->clnt;
1507
1508 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1509 if (IS_ERR(req)) {
1510 err = PTR_ERR(req);
1511 goto error;
1512 }
1513
1514 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1515
1516 p9_tag_remove(clnt, req);
1517 error:
1518 if (err == -ERESTARTSYS)
1519 p9_client_clunk(fid);
1520 else
1521 p9_fid_destroy(fid);
1522 return err;
1523 }
1524 EXPORT_SYMBOL(p9_client_remove);
1525
1526 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1527 {
1528 int err = 0;
1529 struct p9_req_t *req;
1530 struct p9_client *clnt;
1531
1532 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1533 dfid->fid, name, flags);
1534
1535 clnt = dfid->clnt;
1536 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1537 if (IS_ERR(req)) {
1538 err = PTR_ERR(req);
1539 goto error;
1540 }
1541 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1542
1543 p9_tag_remove(clnt, req);
1544 error:
1545 return err;
1546 }
1547 EXPORT_SYMBOL(p9_client_unlinkat);
1548
1549 int
1550 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
1551 {
1552 int total = 0;
1553 *err = 0;
1554
1555 while (iov_iter_count(to)) {
1556 int count;
1557
1558 count = p9_client_read_once(fid, offset, to, err);
1559 if (!count || *err)
1560 break;
1561 offset += count;
1562 total += count;
1563 }
1564 return total;
1565 }
1566 EXPORT_SYMBOL(p9_client_read);
1567
1568 int
1569 p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to,
1570 int *err)
1571 {
1572 struct p9_client *clnt = fid->clnt;
1573 struct p9_req_t *req;
1574 int count = iov_iter_count(to);
1575 int rsize, non_zc = 0;
1576 char *dataptr;
1577
1578 *err = 0;
1579 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1580 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to));
1581
1582 rsize = fid->iounit;
1583 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ)
1584 rsize = clnt->msize - P9_IOHDRSZ;
1585
1586 if (count < rsize)
1587 rsize = count;
1588
1589 /* Don't bother zerocopy for small IO (< 1024) */
1590 if (clnt->trans_mod->zc_request && rsize > 1024) {
1591 /* response header len is 11
1592 * PDU Header(7) + IO Size (4)
1593 */
1594 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize,
1595 0, 11, "dqd", fid->fid,
1596 offset, rsize);
1597 } else {
1598 non_zc = 1;
1599 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1600 rsize);
1601 }
1602 if (IS_ERR(req)) {
1603 *err = PTR_ERR(req);
1604 return 0;
1605 }
1606
1607 *err = p9pdu_readf(&req->rc, clnt->proto_version,
1608 "D", &count, &dataptr);
1609 if (*err) {
1610 trace_9p_protocol_dump(clnt, &req->rc);
1611 p9_tag_remove(clnt, req);
1612 return 0;
1613 }
1614 if (rsize < count) {
1615 pr_err("bogus RREAD count (%d > %d)\n", count, rsize);
1616 count = rsize;
1617 }
1618
1619 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1620 if (!count) {
1621 p9_tag_remove(clnt, req);
1622 return 0;
1623 }
1624
1625 if (non_zc) {
1626 int n = copy_to_iter(dataptr, count, to);
1627
1628 if (n != count) {
1629 *err = -EFAULT;
1630 p9_tag_remove(clnt, req);
1631 return n;
1632 }
1633 } else {
1634 iov_iter_advance(to, count);
1635 }
1636 p9_tag_remove(clnt, req);
1637 return count;
1638 }
1639 EXPORT_SYMBOL(p9_client_read_once);
1640
1641 int
1642 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
1643 {
1644 struct p9_client *clnt = fid->clnt;
1645 struct p9_req_t *req;
1646 int total = 0;
1647 *err = 0;
1648
1649 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n",
1650 fid->fid, (unsigned long long) offset,
1651 iov_iter_count(from));
1652
1653 while (iov_iter_count(from)) {
1654 int count = iov_iter_count(from);
1655 int rsize = fid->iounit;
1656 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1657 rsize = clnt->msize - P9_IOHDRSZ;
1658
1659 if (count < rsize)
1660 rsize = count;
1661
1662 /* Don't bother zerocopy for small IO (< 1024) */
1663 if (clnt->trans_mod->zc_request && rsize > 1024) {
1664 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
1665 rsize, P9_ZC_HDR_SZ, "dqd",
1666 fid->fid, offset, rsize);
1667 } else {
1668 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
1669 offset, rsize, from);
1670 }
1671 if (IS_ERR(req)) {
1672 *err = PTR_ERR(req);
1673 break;
1674 }
1675
1676 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &count);
1677 if (*err) {
1678 trace_9p_protocol_dump(clnt, &req->rc);
1679 p9_tag_remove(clnt, req);
1680 break;
1681 }
1682 if (rsize < count) {
1683 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize);
1684 count = rsize;
1685 }
1686
1687 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1688
1689 p9_tag_remove(clnt, req);
1690 iov_iter_advance(from, count);
1691 total += count;
1692 offset += count;
1693 }
1694 return total;
1695 }
1696 EXPORT_SYMBOL(p9_client_write);
1697
1698 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1699 {
1700 int err;
1701 struct p9_client *clnt;
1702 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1703 struct p9_req_t *req;
1704 u16 ignored;
1705
1706 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1707
1708 if (!ret)
1709 return ERR_PTR(-ENOMEM);
1710
1711 err = 0;
1712 clnt = fid->clnt;
1713
1714 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1715 if (IS_ERR(req)) {
1716 err = PTR_ERR(req);
1717 goto error;
1718 }
1719
1720 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret);
1721 if (err) {
1722 trace_9p_protocol_dump(clnt, &req->rc);
1723 p9_tag_remove(clnt, req);
1724 goto error;
1725 }
1726
1727 p9_debug(P9_DEBUG_9P,
1728 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1729 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1730 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1731 "<<< uid=%d gid=%d n_muid=%d\n",
1732 ret->size, ret->type, ret->dev, ret->qid.type,
1733 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1734 ret->atime, ret->mtime, (unsigned long long)ret->length,
1735 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1736 from_kuid(&init_user_ns, ret->n_uid),
1737 from_kgid(&init_user_ns, ret->n_gid),
1738 from_kuid(&init_user_ns, ret->n_muid));
1739
1740 p9_tag_remove(clnt, req);
1741 return ret;
1742
1743 error:
1744 kfree(ret);
1745 return ERR_PTR(err);
1746 }
1747 EXPORT_SYMBOL(p9_client_stat);
1748
1749 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1750 u64 request_mask)
1751 {
1752 int err;
1753 struct p9_client *clnt;
1754 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1755 GFP_KERNEL);
1756 struct p9_req_t *req;
1757
1758 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1759 fid->fid, request_mask);
1760
1761 if (!ret)
1762 return ERR_PTR(-ENOMEM);
1763
1764 err = 0;
1765 clnt = fid->clnt;
1766
1767 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1768 if (IS_ERR(req)) {
1769 err = PTR_ERR(req);
1770 goto error;
1771 }
1772
1773 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret);
1774 if (err) {
1775 trace_9p_protocol_dump(clnt, &req->rc);
1776 p9_tag_remove(clnt, req);
1777 goto error;
1778 }
1779
1780 p9_debug(P9_DEBUG_9P,
1781 "<<< RGETATTR st_result_mask=%lld\n"
1782 "<<< qid=%x.%llx.%x\n"
1783 "<<< st_mode=%8.8x st_nlink=%llu\n"
1784 "<<< st_uid=%d st_gid=%d\n"
1785 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1786 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1787 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1788 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1789 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1790 "<<< st_gen=%lld st_data_version=%lld\n",
1791 ret->st_result_mask, ret->qid.type, ret->qid.path,
1792 ret->qid.version, ret->st_mode, ret->st_nlink,
1793 from_kuid(&init_user_ns, ret->st_uid),
1794 from_kgid(&init_user_ns, ret->st_gid),
1795 ret->st_rdev, ret->st_size, ret->st_blksize,
1796 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1797 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1798 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1799 ret->st_gen, ret->st_data_version);
1800
1801 p9_tag_remove(clnt, req);
1802 return ret;
1803
1804 error:
1805 kfree(ret);
1806 return ERR_PTR(err);
1807 }
1808 EXPORT_SYMBOL(p9_client_getattr_dotl);
1809
1810 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1811 {
1812 int ret;
1813
1814 /* NOTE: size shouldn't include its own length */
1815 /* size[2] type[2] dev[4] qid[13] */
1816 /* mode[4] atime[4] mtime[4] length[8]*/
1817 /* name[s] uid[s] gid[s] muid[s] */
1818 ret = 2+4+13+4+4+4+8+2+2+2+2;
1819
1820 if (wst->name)
1821 ret += strlen(wst->name);
1822 if (wst->uid)
1823 ret += strlen(wst->uid);
1824 if (wst->gid)
1825 ret += strlen(wst->gid);
1826 if (wst->muid)
1827 ret += strlen(wst->muid);
1828
1829 if ((proto_version == p9_proto_2000u) ||
1830 (proto_version == p9_proto_2000L)) {
1831 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1832 if (wst->extension)
1833 ret += strlen(wst->extension);
1834 }
1835
1836 return ret;
1837 }
1838
1839 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1840 {
1841 int err;
1842 struct p9_req_t *req;
1843 struct p9_client *clnt;
1844
1845 err = 0;
1846 clnt = fid->clnt;
1847 wst->size = p9_client_statsize(wst, clnt->proto_version);
1848 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1849 p9_debug(P9_DEBUG_9P,
1850 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1851 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1852 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1853 " uid=%d gid=%d n_muid=%d\n",
1854 wst->size, wst->type, wst->dev, wst->qid.type,
1855 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1856 wst->atime, wst->mtime, (unsigned long long)wst->length,
1857 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1858 from_kuid(&init_user_ns, wst->n_uid),
1859 from_kgid(&init_user_ns, wst->n_gid),
1860 from_kuid(&init_user_ns, wst->n_muid));
1861
1862 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1863 if (IS_ERR(req)) {
1864 err = PTR_ERR(req);
1865 goto error;
1866 }
1867
1868 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1869
1870 p9_tag_remove(clnt, req);
1871 error:
1872 return err;
1873 }
1874 EXPORT_SYMBOL(p9_client_wstat);
1875
1876 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1877 {
1878 int err;
1879 struct p9_req_t *req;
1880 struct p9_client *clnt;
1881
1882 err = 0;
1883 clnt = fid->clnt;
1884 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1885 p9_debug(P9_DEBUG_9P,
1886 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1887 " atime_sec=%lld atime_nsec=%lld\n"
1888 " mtime_sec=%lld mtime_nsec=%lld\n",
1889 p9attr->valid, p9attr->mode,
1890 from_kuid(&init_user_ns, p9attr->uid),
1891 from_kgid(&init_user_ns, p9attr->gid),
1892 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1893 p9attr->mtime_sec, p9attr->mtime_nsec);
1894
1895 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1896
1897 if (IS_ERR(req)) {
1898 err = PTR_ERR(req);
1899 goto error;
1900 }
1901 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1902 p9_tag_remove(clnt, req);
1903 error:
1904 return err;
1905 }
1906 EXPORT_SYMBOL(p9_client_setattr);
1907
1908 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1909 {
1910 int err;
1911 struct p9_req_t *req;
1912 struct p9_client *clnt;
1913
1914 err = 0;
1915 clnt = fid->clnt;
1916
1917 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1918
1919 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1920 if (IS_ERR(req)) {
1921 err = PTR_ERR(req);
1922 goto error;
1923 }
1924
1925 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1926 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1927 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1928 if (err) {
1929 trace_9p_protocol_dump(clnt, &req->rc);
1930 p9_tag_remove(clnt, req);
1931 goto error;
1932 }
1933
1934 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1935 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1936 "fsid %llu namelen %ld\n",
1937 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1938 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1939 sb->fsid, (long int)sb->namelen);
1940
1941 p9_tag_remove(clnt, req);
1942 error:
1943 return err;
1944 }
1945 EXPORT_SYMBOL(p9_client_statfs);
1946
1947 int p9_client_rename(struct p9_fid *fid,
1948 struct p9_fid *newdirfid, const char *name)
1949 {
1950 int err;
1951 struct p9_req_t *req;
1952 struct p9_client *clnt;
1953
1954 err = 0;
1955 clnt = fid->clnt;
1956
1957 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1958 fid->fid, newdirfid->fid, name);
1959
1960 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1961 newdirfid->fid, name);
1962 if (IS_ERR(req)) {
1963 err = PTR_ERR(req);
1964 goto error;
1965 }
1966
1967 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1968
1969 p9_tag_remove(clnt, req);
1970 error:
1971 return err;
1972 }
1973 EXPORT_SYMBOL(p9_client_rename);
1974
1975 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1976 struct p9_fid *newdirfid, const char *new_name)
1977 {
1978 int err;
1979 struct p9_req_t *req;
1980 struct p9_client *clnt;
1981
1982 err = 0;
1983 clnt = olddirfid->clnt;
1984
1985 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1986 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1987 newdirfid->fid, new_name);
1988
1989 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1990 old_name, newdirfid->fid, new_name);
1991 if (IS_ERR(req)) {
1992 err = PTR_ERR(req);
1993 goto error;
1994 }
1995
1996 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1997 newdirfid->fid, new_name);
1998
1999 p9_tag_remove(clnt, req);
2000 error:
2001 return err;
2002 }
2003 EXPORT_SYMBOL(p9_client_renameat);
2004
2005 /*
2006 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
2007 */
2008 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
2009 const char *attr_name, u64 *attr_size)
2010 {
2011 int err;
2012 struct p9_req_t *req;
2013 struct p9_client *clnt;
2014 struct p9_fid *attr_fid;
2015
2016 err = 0;
2017 clnt = file_fid->clnt;
2018 attr_fid = p9_fid_create(clnt);
2019 if (!attr_fid) {
2020 err = -ENOMEM;
2021 goto error;
2022 }
2023 p9_debug(P9_DEBUG_9P,
2024 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2025 file_fid->fid, attr_fid->fid, attr_name);
2026
2027 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2028 file_fid->fid, attr_fid->fid, attr_name);
2029 if (IS_ERR(req)) {
2030 err = PTR_ERR(req);
2031 goto error;
2032 }
2033 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size);
2034 if (err) {
2035 trace_9p_protocol_dump(clnt, &req->rc);
2036 p9_tag_remove(clnt, req);
2037 goto clunk_fid;
2038 }
2039 p9_tag_remove(clnt, req);
2040 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2041 attr_fid->fid, *attr_size);
2042 return attr_fid;
2043 clunk_fid:
2044 p9_client_clunk(attr_fid);
2045 attr_fid = NULL;
2046 error:
2047 if (attr_fid && (attr_fid != file_fid))
2048 p9_fid_destroy(attr_fid);
2049
2050 return ERR_PTR(err);
2051 }
2052 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2053
2054 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2055 u64 attr_size, int flags)
2056 {
2057 int err;
2058 struct p9_req_t *req;
2059 struct p9_client *clnt;
2060
2061 p9_debug(P9_DEBUG_9P,
2062 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2063 fid->fid, name, (long long)attr_size, flags);
2064 err = 0;
2065 clnt = fid->clnt;
2066 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2067 fid->fid, name, attr_size, flags);
2068 if (IS_ERR(req)) {
2069 err = PTR_ERR(req);
2070 goto error;
2071 }
2072 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2073 p9_tag_remove(clnt, req);
2074 error:
2075 return err;
2076 }
2077 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2078
2079 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2080 {
2081 int err, rsize, non_zc = 0;
2082 struct p9_client *clnt;
2083 struct p9_req_t *req;
2084 char *dataptr;
2085 struct kvec kv = {.iov_base = data, .iov_len = count};
2086 struct iov_iter to;
2087
2088 iov_iter_kvec(&to, READ, &kv, 1, count);
2089
2090 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2091 fid->fid, (unsigned long long) offset, count);
2092
2093 err = 0;
2094 clnt = fid->clnt;
2095
2096 rsize = fid->iounit;
2097 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2098 rsize = clnt->msize - P9_READDIRHDRSZ;
2099
2100 if (count < rsize)
2101 rsize = count;
2102
2103 /* Don't bother zerocopy for small IO (< 1024) */
2104 if (clnt->trans_mod->zc_request && rsize > 1024) {
2105 /*
2106 * response header len is 11
2107 * PDU Header(7) + IO Size (4)
2108 */
2109 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0,
2110 11, "dqd", fid->fid, offset, rsize);
2111 } else {
2112 non_zc = 1;
2113 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2114 offset, rsize);
2115 }
2116 if (IS_ERR(req)) {
2117 err = PTR_ERR(req);
2118 goto error;
2119 }
2120
2121 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr);
2122 if (err) {
2123 trace_9p_protocol_dump(clnt, &req->rc);
2124 goto free_and_error;
2125 }
2126 if (rsize < count) {
2127 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize);
2128 count = rsize;
2129 }
2130
2131 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2132
2133 if (non_zc)
2134 memmove(data, dataptr, count);
2135
2136 p9_tag_remove(clnt, req);
2137 return count;
2138
2139 free_and_error:
2140 p9_tag_remove(clnt, req);
2141 error:
2142 return err;
2143 }
2144 EXPORT_SYMBOL(p9_client_readdir);
2145
2146 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode,
2147 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2148 {
2149 int err;
2150 struct p9_client *clnt;
2151 struct p9_req_t *req;
2152
2153 err = 0;
2154 clnt = fid->clnt;
2155 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2156 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2157 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2158 MAJOR(rdev), MINOR(rdev), gid);
2159 if (IS_ERR(req))
2160 return PTR_ERR(req);
2161
2162 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
2163 if (err) {
2164 trace_9p_protocol_dump(clnt, &req->rc);
2165 goto error;
2166 }
2167 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2168 (unsigned long long)qid->path, qid->version);
2169
2170 error:
2171 p9_tag_remove(clnt, req);
2172 return err;
2173
2174 }
2175 EXPORT_SYMBOL(p9_client_mknod_dotl);
2176
2177 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode,
2178 kgid_t gid, struct p9_qid *qid)
2179 {
2180 int err;
2181 struct p9_client *clnt;
2182 struct p9_req_t *req;
2183
2184 err = 0;
2185 clnt = fid->clnt;
2186 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2187 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2188 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
2189 gid);
2190 if (IS_ERR(req))
2191 return PTR_ERR(req);
2192
2193 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
2194 if (err) {
2195 trace_9p_protocol_dump(clnt, &req->rc);
2196 goto error;
2197 }
2198 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2199 (unsigned long long)qid->path, qid->version);
2200
2201 error:
2202 p9_tag_remove(clnt, req);
2203 return err;
2204
2205 }
2206 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2207
2208 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2209 {
2210 int err;
2211 struct p9_client *clnt;
2212 struct p9_req_t *req;
2213
2214 err = 0;
2215 clnt = fid->clnt;
2216 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2217 "start %lld length %lld proc_id %d client_id %s\n",
2218 fid->fid, flock->type, flock->flags, flock->start,
2219 flock->length, flock->proc_id, flock->client_id);
2220
2221 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2222 flock->flags, flock->start, flock->length,
2223 flock->proc_id, flock->client_id);
2224
2225 if (IS_ERR(req))
2226 return PTR_ERR(req);
2227
2228 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status);
2229 if (err) {
2230 trace_9p_protocol_dump(clnt, &req->rc);
2231 goto error;
2232 }
2233 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2234 error:
2235 p9_tag_remove(clnt, req);
2236 return err;
2237
2238 }
2239 EXPORT_SYMBOL(p9_client_lock_dotl);
2240
2241 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2242 {
2243 int err;
2244 struct p9_client *clnt;
2245 struct p9_req_t *req;
2246
2247 err = 0;
2248 clnt = fid->clnt;
2249 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2250 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2251 glock->start, glock->length, glock->proc_id, glock->client_id);
2252
2253 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2254 glock->start, glock->length, glock->proc_id, glock->client_id);
2255
2256 if (IS_ERR(req))
2257 return PTR_ERR(req);
2258
2259 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type,
2260 &glock->start, &glock->length, &glock->proc_id,
2261 &glock->client_id);
2262 if (err) {
2263 trace_9p_protocol_dump(clnt, &req->rc);
2264 goto error;
2265 }
2266 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2267 "proc_id %d client_id %s\n", glock->type, glock->start,
2268 glock->length, glock->proc_id, glock->client_id);
2269 error:
2270 p9_tag_remove(clnt, req);
2271 return err;
2272 }
2273 EXPORT_SYMBOL(p9_client_getlock_dotl);
2274
2275 int p9_client_readlink(struct p9_fid *fid, char **target)
2276 {
2277 int err;
2278 struct p9_client *clnt;
2279 struct p9_req_t *req;
2280
2281 err = 0;
2282 clnt = fid->clnt;
2283 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2284
2285 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2286 if (IS_ERR(req))
2287 return PTR_ERR(req);
2288
2289 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target);
2290 if (err) {
2291 trace_9p_protocol_dump(clnt, &req->rc);
2292 goto error;
2293 }
2294 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2295 error:
2296 p9_tag_remove(clnt, req);
2297 return err;
2298 }
2299 EXPORT_SYMBOL(p9_client_readlink);
2300
2301 int __init p9_client_init(void)
2302 {
2303 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU);
2304 return p9_req_cache ? 0 : -ENOMEM;
2305 }
2306
2307 void __exit p9_client_exit(void)
2308 {
2309 kmem_cache_destroy(p9_req_cache);
2310 }
Linux with added FPC-III support