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Merge tag 'hwmon-for-v6.13-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux.git] / net / 9p / client.c
blob09f8ced9f8bb7f5174904e0f154a13eb64de9387
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * 9P Client
4 *
5 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
6 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
7 */
8
9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
11 #include <linux/module.h>
12 #include <linux/errno.h>
13 #include <linux/fs.h>
14 #include <linux/poll.h>
15 #include <linux/idr.h>
16 #include <linux/mutex.h>
17 #include <linux/slab.h>
18 #include <linux/sched/signal.h>
19 #include <linux/uaccess.h>
20 #include <linux/uio.h>
21 #include <linux/netfs.h>
22 #include <net/9p/9p.h>
23 #include <linux/parser.h>
24 #include <linux/seq_file.h>
25 #include <net/9p/client.h>
26 #include <net/9p/transport.h>
27 #include "protocol.h"
28
29 #define CREATE_TRACE_POINTS
30 #include <trace/events/9p.h>
31
32 /* DEFAULT MSIZE = 32 pages worth of payload + P9_HDRSZ +
33 * room for write (16 extra) or read (11 extra) operands.
34 */
35
36 #define DEFAULT_MSIZE ((128 * 1024) + P9_IOHDRSZ)
37
38 /* Client Option Parsing (code inspired by NFS code)
39 * - a little lazy - parse all client options
40 */
41
42 enum {
43 Opt_msize,
44 Opt_trans,
45 Opt_legacy,
46 Opt_version,
47 Opt_err,
48 };
49
50 static const match_table_t tokens = {
51 {Opt_msize, "msize=%u"},
52 {Opt_legacy, "noextend"},
53 {Opt_trans, "trans=%s"},
54 {Opt_version, "version=%s"},
55 {Opt_err, NULL},
56 };
57
58 inline int p9_is_proto_dotl(struct p9_client *clnt)
59 {
60 return clnt->proto_version == p9_proto_2000L;
61 }
62 EXPORT_SYMBOL(p9_is_proto_dotl);
63
64 inline int p9_is_proto_dotu(struct p9_client *clnt)
65 {
66 return clnt->proto_version == p9_proto_2000u;
67 }
68 EXPORT_SYMBOL(p9_is_proto_dotu);
69
70 int p9_show_client_options(struct seq_file *m, struct p9_client *clnt)
71 {
72 if (clnt->msize != DEFAULT_MSIZE)
73 seq_printf(m, ",msize=%u", clnt->msize);
74 seq_printf(m, ",trans=%s", clnt->trans_mod->name);
75
76 switch (clnt->proto_version) {
77 case p9_proto_legacy:
78 seq_puts(m, ",noextend");
79 break;
80 case p9_proto_2000u:
81 seq_puts(m, ",version=9p2000.u");
82 break;
83 case p9_proto_2000L:
84 /* Default */
85 break;
86 }
87
88 if (clnt->trans_mod->show_options)
89 return clnt->trans_mod->show_options(m, clnt);
90 return 0;
91 }
92 EXPORT_SYMBOL(p9_show_client_options);
93
94 /* Some error codes are taken directly from the server replies,
95 * make sure they are valid.
96 */
97 static int safe_errno(int err)
98 {
99 if (err > 0 || err < -MAX_ERRNO) {
100 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err);
101 return -EPROTO;
102 }
103 return err;
104 }
105
106 /* Interpret mount option for protocol version */
107 static int get_protocol_version(char *s)
108 {
109 int version = -EINVAL;
110
111 if (!strcmp(s, "9p2000")) {
112 version = p9_proto_legacy;
113 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n");
114 } else if (!strcmp(s, "9p2000.u")) {
115 version = p9_proto_2000u;
116 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
117 } else if (!strcmp(s, "9p2000.L")) {
118 version = p9_proto_2000L;
119 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
120 } else {
121 pr_info("Unknown protocol version %s\n", s);
122 }
123
124 return version;
125 }
126
127 /**
128 * parse_opts - parse mount options into client structure
129 * @opts: options string passed from mount
130 * @clnt: existing v9fs client information
131 *
132 * Return 0 upon success, -ERRNO upon failure
133 */
134
135 static int parse_opts(char *opts, struct p9_client *clnt)
136 {
137 char *options, *tmp_options;
138 char *p;
139 substring_t args[MAX_OPT_ARGS];
140 int option;
141 char *s;
142 int ret = 0;
143
144 clnt->proto_version = p9_proto_2000L;
145 clnt->msize = DEFAULT_MSIZE;
146
147 if (!opts)
148 return 0;
149
150 tmp_options = kstrdup(opts, GFP_KERNEL);
151 if (!tmp_options)
152 return -ENOMEM;
153 options = tmp_options;
154
155 while ((p = strsep(&options, ",")) != NULL) {
156 int token, r;
157
158 if (!*p)
159 continue;
160 token = match_token(p, tokens, args);
161 switch (token) {
162 case Opt_msize:
163 r = match_int(&args[0], &option);
164 if (r < 0) {
165 p9_debug(P9_DEBUG_ERROR,
166 "integer field, but no integer?\n");
167 ret = r;
168 continue;
169 }
170 if (option < 4096) {
171 p9_debug(P9_DEBUG_ERROR,
172 "msize should be at least 4k\n");
173 ret = -EINVAL;
174 continue;
175 }
176 clnt->msize = option;
177 break;
178 case Opt_trans:
179 s = match_strdup(&args[0]);
180 if (!s) {
181 ret = -ENOMEM;
182 p9_debug(P9_DEBUG_ERROR,
183 "problem allocating copy of trans arg\n");
184 goto free_and_return;
185 }
186
187 v9fs_put_trans(clnt->trans_mod);
188 clnt->trans_mod = v9fs_get_trans_by_name(s);
189 if (!clnt->trans_mod) {
190 pr_info("Could not find request transport: %s\n",
191 s);
192 ret = -EINVAL;
193 }
194 kfree(s);
195 break;
196 case Opt_legacy:
197 clnt->proto_version = p9_proto_legacy;
198 break;
199 case Opt_version:
200 s = match_strdup(&args[0]);
201 if (!s) {
202 ret = -ENOMEM;
203 p9_debug(P9_DEBUG_ERROR,
204 "problem allocating copy of version arg\n");
205 goto free_and_return;
206 }
207 r = get_protocol_version(s);
208 if (r < 0)
209 ret = r;
210 else
211 clnt->proto_version = r;
212 kfree(s);
213 break;
214 default:
215 continue;
216 }
217 }
218
219 free_and_return:
220 if (ret)
221 v9fs_put_trans(clnt->trans_mod);
222 kfree(tmp_options);
223 return ret;
224 }
225
226 static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc,
227 int alloc_msize)
228 {
229 if (likely(c->fcall_cache) && alloc_msize == c->msize) {
230 fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS);
231 fc->cache = c->fcall_cache;
232 } else {
233 fc->sdata = kmalloc(alloc_msize, GFP_NOFS);
234 fc->cache = NULL;
235 }
236 if (!fc->sdata)
237 return -ENOMEM;
238 fc->capacity = alloc_msize;
239 fc->id = 0;
240 fc->tag = P9_NOTAG;
241 return 0;
242 }
243
244 void p9_fcall_fini(struct p9_fcall *fc)
245 {
246 /* sdata can be NULL for interrupted requests in trans_rdma,
247 * and kmem_cache_free does not do NULL-check for us
248 */
249 if (unlikely(!fc->sdata))
250 return;
251
252 if (fc->cache)
253 kmem_cache_free(fc->cache, fc->sdata);
254 else
255 kfree(fc->sdata);
256 }
257 EXPORT_SYMBOL(p9_fcall_fini);
258
259 static struct kmem_cache *p9_req_cache;
260
261 /**
262 * p9_tag_alloc - Allocate a new request.
263 * @c: Client session.
264 * @type: Transaction type.
265 * @t_size: Buffer size for holding this request
266 * (automatic calculation by format template if 0).
267 * @r_size: Buffer size for holding server's reply on this request
268 * (automatic calculation by format template if 0).
269 * @fmt: Format template for assembling 9p request message
270 * (see p9pdu_vwritef).
271 * @ap: Variable arguments to be fed to passed format template
272 * (see p9pdu_vwritef).
273 *
274 * Context: Process context.
275 * Return: Pointer to new request.
276 */
277 static struct p9_req_t *
278 p9_tag_alloc(struct p9_client *c, int8_t type, uint t_size, uint r_size,
279 const char *fmt, va_list ap)
280 {
281 struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS);
282 int alloc_tsize;
283 int alloc_rsize;
284 int tag;
285 va_list apc;
286
287 va_copy(apc, ap);
288 alloc_tsize = min_t(size_t, c->msize,
289 t_size ?: p9_msg_buf_size(c, type, fmt, apc));
290 va_end(apc);
291
292 alloc_rsize = min_t(size_t, c->msize,
293 r_size ?: p9_msg_buf_size(c, type + 1, fmt, ap));
294
295 if (!req)
296 return ERR_PTR(-ENOMEM);
297
298 if (p9_fcall_init(c, &req->tc, alloc_tsize))
299 goto free_req;
300 if (p9_fcall_init(c, &req->rc, alloc_rsize))
301 goto free;
302
303 p9pdu_reset(&req->tc);
304 p9pdu_reset(&req->rc);
305 req->t_err = 0;
306 req->status = REQ_STATUS_ALLOC;
307 /* refcount needs to be set to 0 before inserting into the idr
308 * so p9_tag_lookup does not accept a request that is not fully
309 * initialized. refcount_set to 2 below will mark request ready.
310 */
311 refcount_set(&req->refcount, 0);
312 init_waitqueue_head(&req->wq);
313 INIT_LIST_HEAD(&req->req_list);
314
315 idr_preload(GFP_NOFS);
316 spin_lock_irq(&c->lock);
317 if (type == P9_TVERSION)
318 tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1,
319 GFP_NOWAIT);
320 else
321 tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT);
322 req->tc.tag = tag;
323 spin_unlock_irq(&c->lock);
324 idr_preload_end();
325 if (tag < 0)
326 goto free;
327
328 /* Init ref to two because in the general case there is one ref
329 * that is put asynchronously by a writer thread, one ref
330 * temporarily given by p9_tag_lookup and put by p9_client_cb
331 * in the recv thread, and one ref put by p9_req_put in the
332 * main thread. The only exception is virtio that does not use
333 * p9_tag_lookup but does not have a writer thread either
334 * (the write happens synchronously in the request/zc_request
335 * callback), so p9_client_cb eats the second ref there
336 * as the pointer is duplicated directly by virtqueue_add_sgs()
337 */
338 refcount_set(&req->refcount, 2);
339
340 return req;
341
342 free:
343 p9_fcall_fini(&req->tc);
344 p9_fcall_fini(&req->rc);
345 free_req:
346 kmem_cache_free(p9_req_cache, req);
347 return ERR_PTR(-ENOMEM);
348 }
349
350 /**
351 * p9_tag_lookup - Look up a request by tag.
352 * @c: Client session.
353 * @tag: Transaction ID.
354 *
355 * Context: Any context.
356 * Return: A request, or %NULL if there is no request with that tag.
357 */
358 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
359 {
360 struct p9_req_t *req;
361
362 rcu_read_lock();
363 again:
364 req = idr_find(&c->reqs, tag);
365 if (req) {
366 /* We have to be careful with the req found under rcu_read_lock
367 * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the
368 * ref again without corrupting other data, then check again
369 * that the tag matches once we have the ref
370 */
371 if (!p9_req_try_get(req))
372 goto again;
373 if (req->tc.tag != tag) {
374 p9_req_put(c, req);
375 goto again;
376 }
377 }
378 rcu_read_unlock();
379
380 return req;
381 }
382 EXPORT_SYMBOL(p9_tag_lookup);
383
384 /**
385 * p9_tag_remove - Remove a tag.
386 * @c: Client session.
387 * @r: Request of reference.
388 *
389 * Context: Any context.
390 */
391 static void p9_tag_remove(struct p9_client *c, struct p9_req_t *r)
392 {
393 unsigned long flags;
394 u16 tag = r->tc.tag;
395
396 p9_debug(P9_DEBUG_MUX, "freeing clnt %p req %p tag: %d\n", c, r, tag);
397 spin_lock_irqsave(&c->lock, flags);
398 idr_remove(&c->reqs, tag);
399 spin_unlock_irqrestore(&c->lock, flags);
400 }
401
402 int p9_req_put(struct p9_client *c, struct p9_req_t *r)
403 {
404 if (refcount_dec_and_test(&r->refcount)) {
405 p9_tag_remove(c, r);
406
407 p9_fcall_fini(&r->tc);
408 p9_fcall_fini(&r->rc);
409 kmem_cache_free(p9_req_cache, r);
410 return 1;
411 }
412 return 0;
413 }
414 EXPORT_SYMBOL(p9_req_put);
415
416 /**
417 * p9_tag_cleanup - cleans up tags structure and reclaims resources
418 * @c: v9fs client struct
419 *
420 * This frees resources associated with the tags structure
421 *
422 */
423 static void p9_tag_cleanup(struct p9_client *c)
424 {
425 struct p9_req_t *req;
426 int id;
427
428 rcu_read_lock();
429 idr_for_each_entry(&c->reqs, req, id) {
430 pr_info("Tag %d still in use\n", id);
431 if (p9_req_put(c, req) == 0)
432 pr_warn("Packet with tag %d has still references",
433 req->tc.tag);
434 }
435 rcu_read_unlock();
436 }
437
438 /**
439 * p9_client_cb - call back from transport to client
440 * @c: client state
441 * @req: request received
442 * @status: request status, one of REQ_STATUS_*
443 *
444 */
445 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
446 {
447 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag);
448
449 /* This barrier is needed to make sure any change made to req before
450 * the status change is visible to another thread
451 */
452 smp_wmb();
453 WRITE_ONCE(req->status, status);
454
455 wake_up(&req->wq);
456 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag);
457 p9_req_put(c, req);
458 }
459 EXPORT_SYMBOL(p9_client_cb);
460
461 /**
462 * p9_parse_header - parse header arguments out of a packet
463 * @pdu: packet to parse
464 * @size: size of packet
465 * @type: type of request
466 * @tag: tag of packet
467 * @rewind: set if we need to rewind offset afterwards
468 */
469
470 int
471 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type,
472 int16_t *tag, int rewind)
473 {
474 s8 r_type;
475 s16 r_tag;
476 s32 r_size;
477 int offset = pdu->offset;
478 int err;
479
480 pdu->offset = 0;
481
482 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
483 if (err)
484 goto rewind_and_exit;
485
486 if (type)
487 *type = r_type;
488 if (tag)
489 *tag = r_tag;
490 if (size)
491 *size = r_size;
492
493 if (pdu->size != r_size || r_size < 7) {
494 err = -EINVAL;
495 goto rewind_and_exit;
496 }
497
498 pdu->id = r_type;
499 pdu->tag = r_tag;
500
501 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
502 pdu->size, pdu->id, pdu->tag);
503
504 rewind_and_exit:
505 if (rewind)
506 pdu->offset = offset;
507 return err;
508 }
509 EXPORT_SYMBOL(p9_parse_header);
510
511 /**
512 * p9_check_errors - check 9p packet for error return and process it
513 * @c: current client instance
514 * @req: request to parse and check for error conditions
515 *
516 * returns error code if one is discovered, otherwise returns 0
517 *
518 * this will have to be more complicated if we have multiple
519 * error packet types
520 */
521
522 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
523 {
524 s8 type;
525 int err;
526 int ecode;
527
528 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0);
529 if (req->rc.size > req->rc.capacity && !req->rc.zc) {
530 pr_err("requested packet size too big: %d does not fit %zu (type=%d)\n",
531 req->rc.size, req->rc.capacity, req->rc.id);
532 return -EIO;
533 }
534 /* dump the response from server
535 * This should be after check errors which poplulate pdu_fcall.
536 */
537 trace_9p_protocol_dump(c, &req->rc);
538 if (err) {
539 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
540 return err;
541 }
542 if (type != P9_RERROR && type != P9_RLERROR)
543 return 0;
544
545 if (!p9_is_proto_dotl(c)) {
546 char *ename = NULL;
547
548 err = p9pdu_readf(&req->rc, c->proto_version, "s?d",
549 &ename, &ecode);
550 if (err) {
551 kfree(ename);
552 goto out_err;
553 }
554
555 if (p9_is_proto_dotu(c) && ecode < 512)
556 err = -ecode;
557
558 if (!err) {
559 err = p9_errstr2errno(ename, strlen(ename));
560
561 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
562 -ecode, ename);
563 }
564 kfree(ename);
565 } else {
566 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode);
567 if (err)
568 goto out_err;
569 err = -ecode;
570
571 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
572 }
573
574 return err;
575
576 out_err:
577 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
578
579 return err;
580 }
581
582 static struct p9_req_t *
583 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
584
585 /**
586 * p9_client_flush - flush (cancel) a request
587 * @c: client state
588 * @oldreq: request to cancel
589 *
590 * This sents a flush for a particular request and links
591 * the flush request to the original request. The current
592 * code only supports a single flush request although the protocol
593 * allows for multiple flush requests to be sent for a single request.
594 *
595 */
596
597 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
598 {
599 struct p9_req_t *req;
600 s16 oldtag;
601 int err;
602
603 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1);
604 if (err)
605 return err;
606
607 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
608
609 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
610 if (IS_ERR(req))
611 return PTR_ERR(req);
612
613 /* if we haven't received a response for oldreq,
614 * remove it from the list
615 */
616 if (READ_ONCE(oldreq->status) == REQ_STATUS_SENT) {
617 if (c->trans_mod->cancelled)
618 c->trans_mod->cancelled(c, oldreq);
619 }
620
621 p9_req_put(c, req);
622 return 0;
623 }
624
625 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
626 int8_t type, uint t_size, uint r_size,
627 const char *fmt, va_list ap)
628 {
629 int err;
630 struct p9_req_t *req;
631 va_list apc;
632
633 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
634
635 /* we allow for any status other than disconnected */
636 if (c->status == Disconnected)
637 return ERR_PTR(-EIO);
638
639 /* if status is begin_disconnected we allow only clunk request */
640 if (c->status == BeginDisconnect && type != P9_TCLUNK)
641 return ERR_PTR(-EIO);
642
643 va_copy(apc, ap);
644 req = p9_tag_alloc(c, type, t_size, r_size, fmt, apc);
645 va_end(apc);
646 if (IS_ERR(req))
647 return req;
648
649 /* marshall the data */
650 p9pdu_prepare(&req->tc, req->tc.tag, type);
651 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap);
652 if (err)
653 goto reterr;
654 p9pdu_finalize(c, &req->tc);
655 trace_9p_client_req(c, type, req->tc.tag);
656 return req;
657 reterr:
658 p9_req_put(c, req);
659 /* We have to put also the 2nd reference as it won't be used */
660 p9_req_put(c, req);
661 return ERR_PTR(err);
662 }
663
664 /**
665 * p9_client_rpc - issue a request and wait for a response
666 * @c: client session
667 * @type: type of request
668 * @fmt: protocol format string (see protocol.c)
669 *
670 * Returns request structure (which client must free using p9_req_put)
671 */
672
673 static struct p9_req_t *
674 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
675 {
676 va_list ap;
677 int sigpending, err;
678 unsigned long flags;
679 struct p9_req_t *req;
680 /* Passing zero for tsize/rsize to p9_client_prepare_req() tells it to
681 * auto determine an appropriate (small) request/response size
682 * according to actual message data being sent. Currently RDMA
683 * transport is excluded from this response message size optimization,
684 * as it would not cope with it, due to its pooled response buffers
685 * (using an optimized request size for RDMA as well though).
686 */
687 const uint tsize = 0;
688 const uint rsize = c->trans_mod->pooled_rbuffers ? c->msize : 0;
689
690 va_start(ap, fmt);
691 req = p9_client_prepare_req(c, type, tsize, rsize, fmt, ap);
692 va_end(ap);
693 if (IS_ERR(req))
694 return req;
695
696 req->tc.zc = false;
697 req->rc.zc = false;
698
699 if (signal_pending(current)) {
700 sigpending = 1;
701 clear_thread_flag(TIF_SIGPENDING);
702 } else {
703 sigpending = 0;
704 }
705
706 err = c->trans_mod->request(c, req);
707 if (err < 0) {
708 /* write won't happen */
709 p9_req_put(c, req);
710 if (err != -ERESTARTSYS && err != -EFAULT)
711 c->status = Disconnected;
712 goto recalc_sigpending;
713 }
714 again:
715 /* Wait for the response */
716 err = wait_event_killable(req->wq,
717 READ_ONCE(req->status) >= REQ_STATUS_RCVD);
718
719 /* Make sure our req is coherent with regard to updates in other
720 * threads - echoes to wmb() in the callback
721 */
722 smp_rmb();
723
724 if (err == -ERESTARTSYS && c->status == Connected &&
725 type == P9_TFLUSH) {
726 sigpending = 1;
727 clear_thread_flag(TIF_SIGPENDING);
728 goto again;
729 }
730
731 if (READ_ONCE(req->status) == REQ_STATUS_ERROR) {
732 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
733 err = req->t_err;
734 }
735 if (err == -ERESTARTSYS && c->status == Connected) {
736 p9_debug(P9_DEBUG_MUX, "flushing\n");
737 sigpending = 1;
738 clear_thread_flag(TIF_SIGPENDING);
739
740 if (c->trans_mod->cancel(c, req))
741 p9_client_flush(c, req);
742
743 /* if we received the response anyway, don't signal error */
744 if (READ_ONCE(req->status) == REQ_STATUS_RCVD)
745 err = 0;
746 }
747 recalc_sigpending:
748 if (sigpending) {
749 spin_lock_irqsave(&current->sighand->siglock, flags);
750 recalc_sigpending();
751 spin_unlock_irqrestore(&current->sighand->siglock, flags);
752 }
753 if (err < 0)
754 goto reterr;
755
756 err = p9_check_errors(c, req);
757 trace_9p_client_res(c, type, req->rc.tag, err);
758 if (!err)
759 return req;
760 reterr:
761 p9_req_put(c, req);
762 return ERR_PTR(safe_errno(err));
763 }
764
765 /**
766 * p9_client_zc_rpc - issue a request and wait for a response
767 * @c: client session
768 * @type: type of request
769 * @uidata: destination for zero copy read
770 * @uodata: source for zero copy write
771 * @inlen: read buffer size
772 * @olen: write buffer size
773 * @in_hdrlen: reader header size, This is the size of response protocol data
774 * @fmt: protocol format string (see protocol.c)
775 *
776 * Returns request structure (which client must free using p9_req_put)
777 */
778 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
779 struct iov_iter *uidata,
780 struct iov_iter *uodata,
781 int inlen, int olen, int in_hdrlen,
782 const char *fmt, ...)
783 {
784 va_list ap;
785 int sigpending, err;
786 unsigned long flags;
787 struct p9_req_t *req;
788
789 va_start(ap, fmt);
790 /* We allocate a inline protocol data of only 4k bytes.
791 * The actual content is passed in zero-copy fashion.
792 */
793 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, P9_ZC_HDR_SZ, fmt, ap);
794 va_end(ap);
795 if (IS_ERR(req))
796 return req;
797
798 req->tc.zc = true;
799 req->rc.zc = true;
800
801 if (signal_pending(current)) {
802 sigpending = 1;
803 clear_thread_flag(TIF_SIGPENDING);
804 } else {
805 sigpending = 0;
806 }
807
808 err = c->trans_mod->zc_request(c, req, uidata, uodata,
809 inlen, olen, in_hdrlen);
810 if (err < 0) {
811 if (err == -EIO)
812 c->status = Disconnected;
813 if (err != -ERESTARTSYS)
814 goto recalc_sigpending;
815 }
816 if (READ_ONCE(req->status) == REQ_STATUS_ERROR) {
817 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
818 err = req->t_err;
819 }
820 if (err == -ERESTARTSYS && c->status == Connected) {
821 p9_debug(P9_DEBUG_MUX, "flushing\n");
822 sigpending = 1;
823 clear_thread_flag(TIF_SIGPENDING);
824
825 if (c->trans_mod->cancel(c, req))
826 p9_client_flush(c, req);
827
828 /* if we received the response anyway, don't signal error */
829 if (READ_ONCE(req->status) == REQ_STATUS_RCVD)
830 err = 0;
831 }
832 recalc_sigpending:
833 if (sigpending) {
834 spin_lock_irqsave(&current->sighand->siglock, flags);
835 recalc_sigpending();
836 spin_unlock_irqrestore(&current->sighand->siglock, flags);
837 }
838 if (err < 0)
839 goto reterr;
840
841 err = p9_check_errors(c, req);
842 trace_9p_client_res(c, type, req->rc.tag, err);
843 if (!err)
844 return req;
845 reterr:
846 p9_req_put(c, req);
847 return ERR_PTR(safe_errno(err));
848 }
849
850 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
851 {
852 int ret;
853 struct p9_fid *fid;
854
855 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
856 fid = kzalloc(sizeof(*fid), GFP_KERNEL);
857 if (!fid)
858 return NULL;
859
860 fid->mode = -1;
861 fid->uid = current_fsuid();
862 fid->clnt = clnt;
863 refcount_set(&fid->count, 1);
864
865 idr_preload(GFP_KERNEL);
866 spin_lock_irq(&clnt->lock);
867 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1,
868 GFP_NOWAIT);
869 spin_unlock_irq(&clnt->lock);
870 idr_preload_end();
871 if (!ret) {
872 trace_9p_fid_ref(fid, P9_FID_REF_CREATE);
873 return fid;
874 }
875
876 kfree(fid);
877 return NULL;
878 }
879
880 static void p9_fid_destroy(struct p9_fid *fid)
881 {
882 struct p9_client *clnt;
883 unsigned long flags;
884
885 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
886 trace_9p_fid_ref(fid, P9_FID_REF_DESTROY);
887 clnt = fid->clnt;
888 spin_lock_irqsave(&clnt->lock, flags);
889 idr_remove(&clnt->fids, fid->fid);
890 spin_unlock_irqrestore(&clnt->lock, flags);
891 kfree(fid->rdir);
892 kfree(fid);
893 }
894
895 /* We also need to export tracepoint symbols for tracepoint_enabled() */
896 EXPORT_TRACEPOINT_SYMBOL(9p_fid_ref);
897
898 void do_trace_9p_fid_get(struct p9_fid *fid)
899 {
900 trace_9p_fid_ref(fid, P9_FID_REF_GET);
901 }
902 EXPORT_SYMBOL(do_trace_9p_fid_get);
903
904 void do_trace_9p_fid_put(struct p9_fid *fid)
905 {
906 trace_9p_fid_ref(fid, P9_FID_REF_PUT);
907 }
908 EXPORT_SYMBOL(do_trace_9p_fid_put);
909
910 static int p9_client_version(struct p9_client *c)
911 {
912 int err;
913 struct p9_req_t *req;
914 char *version = NULL;
915 int msize;
916
917 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
918 c->msize, c->proto_version);
919
920 switch (c->proto_version) {
921 case p9_proto_2000L:
922 req = p9_client_rpc(c, P9_TVERSION, "ds",
923 c->msize, "9P2000.L");
924 break;
925 case p9_proto_2000u:
926 req = p9_client_rpc(c, P9_TVERSION, "ds",
927 c->msize, "9P2000.u");
928 break;
929 case p9_proto_legacy:
930 req = p9_client_rpc(c, P9_TVERSION, "ds",
931 c->msize, "9P2000");
932 break;
933 default:
934 return -EINVAL;
935 }
936
937 if (IS_ERR(req))
938 return PTR_ERR(req);
939
940 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version);
941 if (err) {
942 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
943 trace_9p_protocol_dump(c, &req->rc);
944 goto error;
945 }
946
947 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
948 if (!strncmp(version, "9P2000.L", 8)) {
949 c->proto_version = p9_proto_2000L;
950 } else if (!strncmp(version, "9P2000.u", 8)) {
951 c->proto_version = p9_proto_2000u;
952 } else if (!strncmp(version, "9P2000", 6)) {
953 c->proto_version = p9_proto_legacy;
954 } else {
955 p9_debug(P9_DEBUG_ERROR,
956 "server returned an unknown version: %s\n", version);
957 err = -EREMOTEIO;
958 goto error;
959 }
960
961 if (msize < 4096) {
962 p9_debug(P9_DEBUG_ERROR,
963 "server returned a msize < 4096: %d\n", msize);
964 err = -EREMOTEIO;
965 goto error;
966 }
967 if (msize < c->msize)
968 c->msize = msize;
969
970 error:
971 kfree(version);
972 p9_req_put(c, req);
973
974 return err;
975 }
976
977 struct p9_client *p9_client_create(const char *dev_name, char *options)
978 {
979 int err;
980 static atomic_t seqno = ATOMIC_INIT(0);
981 struct p9_client *clnt;
982 char *client_id;
983 char *cache_name;
984
985 clnt = kmalloc(sizeof(*clnt), GFP_KERNEL);
986 if (!clnt)
987 return ERR_PTR(-ENOMEM);
988
989 clnt->trans_mod = NULL;
990 clnt->trans = NULL;
991 clnt->fcall_cache = NULL;
992
993 client_id = utsname()->nodename;
994 memcpy(clnt->name, client_id, strlen(client_id) + 1);
995
996 spin_lock_init(&clnt->lock);
997 idr_init(&clnt->fids);
998 idr_init(&clnt->reqs);
999
1000 err = parse_opts(options, clnt);
1001 if (err < 0)
1002 goto free_client;
1003
1004 if (!clnt->trans_mod)
1005 clnt->trans_mod = v9fs_get_default_trans();
1006
1007 if (!clnt->trans_mod) {
1008 err = -EPROTONOSUPPORT;
1009 p9_debug(P9_DEBUG_ERROR,
1010 "No transport defined or default transport\n");
1011 goto free_client;
1012 }
1013
1014 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1015 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1016
1017 err = clnt->trans_mod->create(clnt, dev_name, options);
1018 if (err)
1019 goto put_trans;
1020
1021 if (clnt->msize > clnt->trans_mod->maxsize) {
1022 clnt->msize = clnt->trans_mod->maxsize;
1023 pr_info("Limiting 'msize' to %d as this is the maximum "
1024 "supported by transport %s\n",
1025 clnt->msize, clnt->trans_mod->name
1026 );
1027 }
1028
1029 if (clnt->msize < 4096) {
1030 p9_debug(P9_DEBUG_ERROR,
1031 "Please specify a msize of at least 4k\n");
1032 err = -EINVAL;
1033 goto close_trans;
1034 }
1035
1036 err = p9_client_version(clnt);
1037 if (err)
1038 goto close_trans;
1039
1040 cache_name = kasprintf(GFP_KERNEL,
1041 "9p-fcall-cache-%u", atomic_inc_return(&seqno));
1042 if (!cache_name) {
1043 err = -ENOMEM;
1044 goto close_trans;
1045 }
1046
1047 /* P9_HDRSZ + 4 is the smallest packet header we can have that is
1048 * followed by data accessed from userspace by read
1049 */
1050 clnt->fcall_cache =
1051 kmem_cache_create_usercopy(cache_name, clnt->msize,
1052 0, 0, P9_HDRSZ + 4,
1053 clnt->msize - (P9_HDRSZ + 4),
1054 NULL);
1055
1056 kfree(cache_name);
1057 return clnt;
1058
1059 close_trans:
1060 clnt->trans_mod->close(clnt);
1061 put_trans:
1062 v9fs_put_trans(clnt->trans_mod);
1063 free_client:
1064 kfree(clnt);
1065 return ERR_PTR(err);
1066 }
1067 EXPORT_SYMBOL(p9_client_create);
1068
1069 void p9_client_destroy(struct p9_client *clnt)
1070 {
1071 struct p9_fid *fid;
1072 int id;
1073
1074 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1075
1076 if (clnt->trans_mod)
1077 clnt->trans_mod->close(clnt);
1078
1079 v9fs_put_trans(clnt->trans_mod);
1080
1081 idr_for_each_entry(&clnt->fids, fid, id) {
1082 pr_info("Found fid %d not clunked\n", fid->fid);
1083 p9_fid_destroy(fid);
1084 }
1085
1086 p9_tag_cleanup(clnt);
1087
1088 kmem_cache_destroy(clnt->fcall_cache);
1089 kfree(clnt);
1090 }
1091 EXPORT_SYMBOL(p9_client_destroy);
1092
1093 void p9_client_disconnect(struct p9_client *clnt)
1094 {
1095 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1096 clnt->status = Disconnected;
1097 }
1098 EXPORT_SYMBOL(p9_client_disconnect);
1099
1100 void p9_client_begin_disconnect(struct p9_client *clnt)
1101 {
1102 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1103 clnt->status = BeginDisconnect;
1104 }
1105 EXPORT_SYMBOL(p9_client_begin_disconnect);
1106
1107 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1108 const char *uname, kuid_t n_uname,
1109 const char *aname)
1110 {
1111 int err;
1112 struct p9_req_t *req;
1113 struct p9_fid *fid;
1114 struct p9_qid qid;
1115
1116 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1117 afid ? afid->fid : -1, uname, aname);
1118 fid = p9_fid_create(clnt);
1119 if (!fid) {
1120 err = -ENOMEM;
1121 goto error;
1122 }
1123 fid->uid = n_uname;
1124
1125 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1126 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1127 if (IS_ERR(req)) {
1128 err = PTR_ERR(req);
1129 goto error;
1130 }
1131
1132 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid);
1133 if (err) {
1134 trace_9p_protocol_dump(clnt, &req->rc);
1135 p9_req_put(clnt, req);
1136 goto error;
1137 }
1138
1139 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1140 qid.type, qid.path, qid.version);
1141
1142 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1143
1144 p9_req_put(clnt, req);
1145 return fid;
1146
1147 error:
1148 if (fid)
1149 p9_fid_destroy(fid);
1150 return ERR_PTR(err);
1151 }
1152 EXPORT_SYMBOL(p9_client_attach);
1153
1154 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1155 const unsigned char * const *wnames, int clone)
1156 {
1157 int err;
1158 struct p9_client *clnt;
1159 struct p9_fid *fid;
1160 struct p9_qid *wqids;
1161 struct p9_req_t *req;
1162 u16 nwqids, count;
1163
1164 wqids = NULL;
1165 clnt = oldfid->clnt;
1166 if (clone) {
1167 fid = p9_fid_create(clnt);
1168 if (!fid) {
1169 err = -ENOMEM;
1170 goto error;
1171 }
1172
1173 fid->uid = oldfid->uid;
1174 } else {
1175 fid = oldfid;
1176 }
1177
1178 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1179 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1180 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1181 nwname, wnames);
1182 if (IS_ERR(req)) {
1183 err = PTR_ERR(req);
1184 goto error;
1185 }
1186
1187 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1188 if (err) {
1189 trace_9p_protocol_dump(clnt, &req->rc);
1190 p9_req_put(clnt, req);
1191 goto clunk_fid;
1192 }
1193 p9_req_put(clnt, req);
1194
1195 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1196
1197 if (nwqids != nwname) {
1198 err = -ENOENT;
1199 goto clunk_fid;
1200 }
1201
1202 for (count = 0; count < nwqids; count++)
1203 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1204 count, wqids[count].type,
1205 wqids[count].path,
1206 wqids[count].version);
1207
1208 if (nwname)
1209 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1210 else
1211 memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid));
1212
1213 kfree(wqids);
1214 return fid;
1215
1216 clunk_fid:
1217 kfree(wqids);
1218 p9_fid_put(fid);
1219 fid = NULL;
1220
1221 error:
1222 if (fid && fid != oldfid)
1223 p9_fid_destroy(fid);
1224
1225 return ERR_PTR(err);
1226 }
1227 EXPORT_SYMBOL(p9_client_walk);
1228
1229 int p9_client_open(struct p9_fid *fid, int mode)
1230 {
1231 int err;
1232 struct p9_client *clnt;
1233 struct p9_req_t *req;
1234 struct p9_qid qid;
1235 int iounit;
1236
1237 clnt = fid->clnt;
1238 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1239 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1240
1241 if (fid->mode != -1)
1242 return -EINVAL;
1243
1244 if (p9_is_proto_dotl(clnt))
1245 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode & P9L_MODE_MASK);
1246 else
1247 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode & P9L_MODE_MASK);
1248 if (IS_ERR(req)) {
1249 err = PTR_ERR(req);
1250 goto error;
1251 }
1252
1253 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1254 if (err) {
1255 trace_9p_protocol_dump(clnt, &req->rc);
1256 goto free_and_error;
1257 }
1258
1259 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1260 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1261 qid.path, qid.version, iounit);
1262
1263 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1264 fid->mode = mode;
1265 fid->iounit = iounit;
1266
1267 free_and_error:
1268 p9_req_put(clnt, req);
1269 error:
1270 return err;
1271 }
1272 EXPORT_SYMBOL(p9_client_open);
1273
1274 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags,
1275 u32 mode, kgid_t gid, struct p9_qid *qid)
1276 {
1277 int err;
1278 struct p9_client *clnt;
1279 struct p9_req_t *req;
1280 int iounit;
1281
1282 p9_debug(P9_DEBUG_9P,
1283 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1284 ofid->fid, name, flags, mode,
1285 from_kgid(&init_user_ns, gid));
1286 clnt = ofid->clnt;
1287
1288 if (ofid->mode != -1)
1289 return -EINVAL;
1290
1291 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1292 mode & P9L_MODE_MASK, gid);
1293 if (IS_ERR(req)) {
1294 err = PTR_ERR(req);
1295 goto error;
1296 }
1297
1298 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit);
1299 if (err) {
1300 trace_9p_protocol_dump(clnt, &req->rc);
1301 goto free_and_error;
1302 }
1303
1304 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1305 qid->type, qid->path, qid->version, iounit);
1306
1307 memmove(&ofid->qid, qid, sizeof(struct p9_qid));
1308 ofid->mode = flags;
1309 ofid->iounit = iounit;
1310
1311 free_and_error:
1312 p9_req_put(clnt, req);
1313 error:
1314 return err;
1315 }
1316 EXPORT_SYMBOL(p9_client_create_dotl);
1317
1318 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode,
1319 char *extension)
1320 {
1321 int err;
1322 struct p9_client *clnt;
1323 struct p9_req_t *req;
1324 struct p9_qid qid;
1325 int iounit;
1326
1327 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1328 fid->fid, name, perm, mode);
1329 clnt = fid->clnt;
1330
1331 if (fid->mode != -1)
1332 return -EINVAL;
1333
1334 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1335 mode & P9L_MODE_MASK, extension);
1336 if (IS_ERR(req)) {
1337 err = PTR_ERR(req);
1338 goto error;
1339 }
1340
1341 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1342 if (err) {
1343 trace_9p_protocol_dump(clnt, &req->rc);
1344 goto free_and_error;
1345 }
1346
1347 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1348 qid.type, qid.path, qid.version, iounit);
1349
1350 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1351 fid->mode = mode;
1352 fid->iounit = iounit;
1353
1354 free_and_error:
1355 p9_req_put(clnt, req);
1356 error:
1357 return err;
1358 }
1359 EXPORT_SYMBOL(p9_client_fcreate);
1360
1361 int p9_client_symlink(struct p9_fid *dfid, const char *name,
1362 const char *symtgt, kgid_t gid, struct p9_qid *qid)
1363 {
1364 int err;
1365 struct p9_client *clnt;
1366 struct p9_req_t *req;
1367
1368 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1369 dfid->fid, name, symtgt);
1370 clnt = dfid->clnt;
1371
1372 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1373 gid);
1374 if (IS_ERR(req)) {
1375 err = PTR_ERR(req);
1376 goto error;
1377 }
1378
1379 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
1380 if (err) {
1381 trace_9p_protocol_dump(clnt, &req->rc);
1382 goto free_and_error;
1383 }
1384
1385 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1386 qid->type, qid->path, qid->version);
1387
1388 free_and_error:
1389 p9_req_put(clnt, req);
1390 error:
1391 return err;
1392 }
1393 EXPORT_SYMBOL(p9_client_symlink);
1394
1395 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname)
1396 {
1397 struct p9_client *clnt;
1398 struct p9_req_t *req;
1399
1400 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1401 dfid->fid, oldfid->fid, newname);
1402 clnt = dfid->clnt;
1403 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1404 newname);
1405 if (IS_ERR(req))
1406 return PTR_ERR(req);
1407
1408 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1409 p9_req_put(clnt, req);
1410 return 0;
1411 }
1412 EXPORT_SYMBOL(p9_client_link);
1413
1414 int p9_client_fsync(struct p9_fid *fid, int datasync)
1415 {
1416 int err = 0;
1417 struct p9_client *clnt;
1418 struct p9_req_t *req;
1419
1420 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1421 fid->fid, datasync);
1422 clnt = fid->clnt;
1423
1424 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1425 if (IS_ERR(req)) {
1426 err = PTR_ERR(req);
1427 goto error;
1428 }
1429
1430 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1431
1432 p9_req_put(clnt, req);
1433
1434 error:
1435 return err;
1436 }
1437 EXPORT_SYMBOL(p9_client_fsync);
1438
1439 int p9_client_clunk(struct p9_fid *fid)
1440 {
1441 int err = 0;
1442 struct p9_client *clnt;
1443 struct p9_req_t *req;
1444 int retries = 0;
1445
1446 again:
1447 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n",
1448 fid->fid, retries);
1449 clnt = fid->clnt;
1450
1451 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1452 if (IS_ERR(req)) {
1453 err = PTR_ERR(req);
1454 goto error;
1455 }
1456
1457 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1458
1459 p9_req_put(clnt, req);
1460 error:
1461 /* Fid is not valid even after a failed clunk
1462 * If interrupted, retry once then give up and
1463 * leak fid until umount.
1464 */
1465 if (err == -ERESTARTSYS) {
1466 if (retries++ == 0)
1467 goto again;
1468 } else {
1469 p9_fid_destroy(fid);
1470 }
1471 return err;
1472 }
1473 EXPORT_SYMBOL(p9_client_clunk);
1474
1475 int p9_client_remove(struct p9_fid *fid)
1476 {
1477 int err = 0;
1478 struct p9_client *clnt;
1479 struct p9_req_t *req;
1480
1481 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1482 clnt = fid->clnt;
1483
1484 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1485 if (IS_ERR(req)) {
1486 err = PTR_ERR(req);
1487 goto error;
1488 }
1489
1490 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1491
1492 p9_req_put(clnt, req);
1493 error:
1494 if (err == -ERESTARTSYS)
1495 p9_fid_put(fid);
1496 else
1497 p9_fid_destroy(fid);
1498 return err;
1499 }
1500 EXPORT_SYMBOL(p9_client_remove);
1501
1502 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1503 {
1504 int err = 0;
1505 struct p9_req_t *req;
1506 struct p9_client *clnt;
1507
1508 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1509 dfid->fid, name, flags);
1510
1511 clnt = dfid->clnt;
1512 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1513 if (IS_ERR(req)) {
1514 err = PTR_ERR(req);
1515 goto error;
1516 }
1517 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1518
1519 p9_req_put(clnt, req);
1520 error:
1521 return err;
1522 }
1523 EXPORT_SYMBOL(p9_client_unlinkat);
1524
1525 int
1526 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
1527 {
1528 int total = 0;
1529 *err = 0;
1530
1531 while (iov_iter_count(to)) {
1532 int count;
1533
1534 count = p9_client_read_once(fid, offset, to, err);
1535 if (!count || *err)
1536 break;
1537 offset += count;
1538 total += count;
1539 }
1540 return total;
1541 }
1542 EXPORT_SYMBOL(p9_client_read);
1543
1544 int
1545 p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to,
1546 int *err)
1547 {
1548 struct p9_client *clnt = fid->clnt;
1549 struct p9_req_t *req;
1550 int count = iov_iter_count(to);
1551 int rsize, received, non_zc = 0;
1552 char *dataptr;
1553
1554 *err = 0;
1555 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %zu\n",
1556 fid->fid, offset, iov_iter_count(to));
1557
1558 rsize = fid->iounit;
1559 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ)
1560 rsize = clnt->msize - P9_IOHDRSZ;
1561
1562 if (count < rsize)
1563 rsize = count;
1564
1565 /* Don't bother zerocopy for small IO (< 1024) */
1566 if (clnt->trans_mod->zc_request && rsize > 1024) {
1567 /* response header len is 11
1568 * PDU Header(7) + IO Size (4)
1569 */
1570 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize,
1571 0, 11, "dqd", fid->fid,
1572 offset, rsize);
1573 } else {
1574 non_zc = 1;
1575 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1576 rsize);
1577 }
1578 if (IS_ERR(req)) {
1579 *err = PTR_ERR(req);
1580 if (!non_zc)
1581 iov_iter_revert(to, count - iov_iter_count(to));
1582 return 0;
1583 }
1584
1585 *err = p9pdu_readf(&req->rc, clnt->proto_version,
1586 "D", &received, &dataptr);
1587 if (*err) {
1588 if (!non_zc)
1589 iov_iter_revert(to, count - iov_iter_count(to));
1590 trace_9p_protocol_dump(clnt, &req->rc);
1591 p9_req_put(clnt, req);
1592 return 0;
1593 }
1594 if (rsize < received) {
1595 pr_err("bogus RREAD count (%d > %d)\n", received, rsize);
1596 received = rsize;
1597 }
1598
1599 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", received);
1600
1601 if (non_zc) {
1602 int n = copy_to_iter(dataptr, received, to);
1603
1604 if (n != received) {
1605 *err = -EFAULT;
1606 p9_req_put(clnt, req);
1607 return n;
1608 }
1609 } else {
1610 iov_iter_revert(to, count - received - iov_iter_count(to));
1611 }
1612 p9_req_put(clnt, req);
1613 return received;
1614 }
1615 EXPORT_SYMBOL(p9_client_read_once);
1616
1617 int
1618 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
1619 {
1620 struct p9_client *clnt = fid->clnt;
1621 struct p9_req_t *req;
1622 int total = 0;
1623 *err = 0;
1624
1625 while (iov_iter_count(from)) {
1626 int count = iov_iter_count(from);
1627 int rsize = fid->iounit;
1628 int written;
1629
1630 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ)
1631 rsize = clnt->msize - P9_IOHDRSZ;
1632
1633 if (count < rsize)
1634 rsize = count;
1635
1636 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d (/%d)\n",
1637 fid->fid, offset, rsize, count);
1638
1639 /* Don't bother zerocopy for small IO (< 1024) */
1640 if (clnt->trans_mod->zc_request && rsize > 1024) {
1641 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
1642 rsize, P9_ZC_HDR_SZ, "dqd",
1643 fid->fid, offset, rsize);
1644 } else {
1645 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
1646 offset, rsize, from);
1647 }
1648 if (IS_ERR(req)) {
1649 iov_iter_revert(from, count - iov_iter_count(from));
1650 *err = PTR_ERR(req);
1651 break;
1652 }
1653
1654 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &written);
1655 if (*err) {
1656 iov_iter_revert(from, count - iov_iter_count(from));
1657 trace_9p_protocol_dump(clnt, &req->rc);
1658 p9_req_put(clnt, req);
1659 break;
1660 }
1661 if (rsize < written) {
1662 pr_err("bogus RWRITE count (%d > %d)\n", written, rsize);
1663 written = rsize;
1664 }
1665
1666 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", written);
1667
1668 p9_req_put(clnt, req);
1669 iov_iter_revert(from, count - written - iov_iter_count(from));
1670 total += written;
1671 offset += written;
1672 }
1673 return total;
1674 }
1675 EXPORT_SYMBOL(p9_client_write);
1676
1677 void
1678 p9_client_write_subreq(struct netfs_io_subrequest *subreq)
1679 {
1680 struct netfs_io_request *wreq = subreq->rreq;
1681 struct p9_fid *fid = wreq->netfs_priv;
1682 struct p9_client *clnt = fid->clnt;
1683 struct p9_req_t *req;
1684 unsigned long long start = subreq->start + subreq->transferred;
1685 int written, len = subreq->len - subreq->transferred;
1686 int err;
1687
1688 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu len %d\n",
1689 fid->fid, start, len);
1690
1691 /* Don't bother zerocopy for small IO (< 1024) */
1692 if (clnt->trans_mod->zc_request && len > 1024) {
1693 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, &subreq->io_iter,
1694 0, wreq->len, P9_ZC_HDR_SZ, "dqd",
1695 fid->fid, start, len);
1696 } else {
1697 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
1698 start, len, &subreq->io_iter);
1699 }
1700 if (IS_ERR(req)) {
1701 netfs_write_subrequest_terminated(subreq, PTR_ERR(req), false);
1702 return;
1703 }
1704
1705 err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &written);
1706 if (err) {
1707 trace_9p_protocol_dump(clnt, &req->rc);
1708 p9_req_put(clnt, req);
1709 netfs_write_subrequest_terminated(subreq, err, false);
1710 return;
1711 }
1712
1713 if (written > len) {
1714 pr_err("bogus RWRITE count (%d > %u)\n", written, len);
1715 written = len;
1716 }
1717
1718 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", len);
1719
1720 p9_req_put(clnt, req);
1721 netfs_write_subrequest_terminated(subreq, written, false);
1722 }
1723 EXPORT_SYMBOL(p9_client_write_subreq);
1724
1725 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1726 {
1727 int err;
1728 struct p9_client *clnt;
1729 struct p9_wstat *ret;
1730 struct p9_req_t *req;
1731 u16 ignored;
1732
1733 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1734
1735 ret = kmalloc(sizeof(*ret), GFP_KERNEL);
1736 if (!ret)
1737 return ERR_PTR(-ENOMEM);
1738
1739 clnt = fid->clnt;
1740
1741 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1742 if (IS_ERR(req)) {
1743 err = PTR_ERR(req);
1744 goto error;
1745 }
1746
1747 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret);
1748 if (err) {
1749 trace_9p_protocol_dump(clnt, &req->rc);
1750 p9_req_put(clnt, req);
1751 goto error;
1752 }
1753
1754 p9_debug(P9_DEBUG_9P,
1755 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1756 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1757 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1758 "<<< uid=%d gid=%d n_muid=%d\n",
1759 ret->size, ret->type, ret->dev, ret->qid.type, ret->qid.path,
1760 ret->qid.version, ret->mode,
1761 ret->atime, ret->mtime, ret->length,
1762 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1763 from_kuid(&init_user_ns, ret->n_uid),
1764 from_kgid(&init_user_ns, ret->n_gid),
1765 from_kuid(&init_user_ns, ret->n_muid));
1766
1767 p9_req_put(clnt, req);
1768 return ret;
1769
1770 error:
1771 kfree(ret);
1772 return ERR_PTR(err);
1773 }
1774 EXPORT_SYMBOL(p9_client_stat);
1775
1776 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1777 u64 request_mask)
1778 {
1779 int err;
1780 struct p9_client *clnt;
1781 struct p9_stat_dotl *ret;
1782 struct p9_req_t *req;
1783
1784 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1785 fid->fid, request_mask);
1786
1787 ret = kmalloc(sizeof(*ret), GFP_KERNEL);
1788 if (!ret)
1789 return ERR_PTR(-ENOMEM);
1790
1791 clnt = fid->clnt;
1792
1793 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1794 if (IS_ERR(req)) {
1795 err = PTR_ERR(req);
1796 goto error;
1797 }
1798
1799 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret);
1800 if (err) {
1801 trace_9p_protocol_dump(clnt, &req->rc);
1802 p9_req_put(clnt, req);
1803 goto error;
1804 }
1805
1806 p9_debug(P9_DEBUG_9P, "<<< RGETATTR st_result_mask=%lld\n"
1807 "<<< qid=%x.%llx.%x\n"
1808 "<<< st_mode=%8.8x st_nlink=%llu\n"
1809 "<<< st_uid=%d st_gid=%d\n"
1810 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1811 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1812 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1813 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1814 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1815 "<<< st_gen=%lld st_data_version=%lld\n",
1816 ret->st_result_mask,
1817 ret->qid.type, ret->qid.path, ret->qid.version,
1818 ret->st_mode, ret->st_nlink,
1819 from_kuid(&init_user_ns, ret->st_uid),
1820 from_kgid(&init_user_ns, ret->st_gid),
1821 ret->st_rdev, ret->st_size, ret->st_blksize, ret->st_blocks,
1822 ret->st_atime_sec, ret->st_atime_nsec,
1823 ret->st_mtime_sec, ret->st_mtime_nsec,
1824 ret->st_ctime_sec, ret->st_ctime_nsec,
1825 ret->st_btime_sec, ret->st_btime_nsec,
1826 ret->st_gen, ret->st_data_version);
1827
1828 p9_req_put(clnt, req);
1829 return ret;
1830
1831 error:
1832 kfree(ret);
1833 return ERR_PTR(err);
1834 }
1835 EXPORT_SYMBOL(p9_client_getattr_dotl);
1836
1837 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1838 {
1839 int ret;
1840
1841 /* NOTE: size shouldn't include its own length */
1842 /* size[2] type[2] dev[4] qid[13] */
1843 /* mode[4] atime[4] mtime[4] length[8]*/
1844 /* name[s] uid[s] gid[s] muid[s] */
1845 ret = 2 + 4 + 13 + 4 + 4 + 4 + 8 + 2 + 2 + 2 + 2;
1846
1847 if (wst->name)
1848 ret += strlen(wst->name);
1849 if (wst->uid)
1850 ret += strlen(wst->uid);
1851 if (wst->gid)
1852 ret += strlen(wst->gid);
1853 if (wst->muid)
1854 ret += strlen(wst->muid);
1855
1856 if (proto_version == p9_proto_2000u ||
1857 proto_version == p9_proto_2000L) {
1858 /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1859 ret += 2 + 4 + 4 + 4;
1860 if (wst->extension)
1861 ret += strlen(wst->extension);
1862 }
1863
1864 return ret;
1865 }
1866
1867 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1868 {
1869 int err = 0;
1870 struct p9_req_t *req;
1871 struct p9_client *clnt;
1872
1873 clnt = fid->clnt;
1874 wst->size = p9_client_statsize(wst, clnt->proto_version);
1875 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n",
1876 fid->fid);
1877 p9_debug(P9_DEBUG_9P,
1878 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1879 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1880 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1881 " uid=%d gid=%d n_muid=%d\n",
1882 wst->size, wst->type, wst->dev, wst->qid.type,
1883 wst->qid.path, wst->qid.version,
1884 wst->mode, wst->atime, wst->mtime, wst->length,
1885 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1886 from_kuid(&init_user_ns, wst->n_uid),
1887 from_kgid(&init_user_ns, wst->n_gid),
1888 from_kuid(&init_user_ns, wst->n_muid));
1889
1890 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS",
1891 fid->fid, wst->size + 2, wst);
1892 if (IS_ERR(req)) {
1893 err = PTR_ERR(req);
1894 goto error;
1895 }
1896
1897 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1898
1899 p9_req_put(clnt, req);
1900 error:
1901 return err;
1902 }
1903 EXPORT_SYMBOL(p9_client_wstat);
1904
1905 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1906 {
1907 int err = 0;
1908 struct p9_req_t *req;
1909 struct p9_client *clnt;
1910
1911 clnt = fid->clnt;
1912 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1913 p9_debug(P9_DEBUG_9P, " valid=%x mode=%x uid=%d gid=%d size=%lld\n",
1914 p9attr->valid, p9attr->mode,
1915 from_kuid(&init_user_ns, p9attr->uid),
1916 from_kgid(&init_user_ns, p9attr->gid),
1917 p9attr->size);
1918 p9_debug(P9_DEBUG_9P, " atime_sec=%lld atime_nsec=%lld\n",
1919 p9attr->atime_sec, p9attr->atime_nsec);
1920 p9_debug(P9_DEBUG_9P, " mtime_sec=%lld mtime_nsec=%lld\n",
1921 p9attr->mtime_sec, p9attr->mtime_nsec);
1922
1923 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1924
1925 if (IS_ERR(req)) {
1926 err = PTR_ERR(req);
1927 goto error;
1928 }
1929 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1930 p9_req_put(clnt, req);
1931 error:
1932 return err;
1933 }
1934 EXPORT_SYMBOL(p9_client_setattr);
1935
1936 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1937 {
1938 int err;
1939 struct p9_req_t *req;
1940 struct p9_client *clnt;
1941
1942 clnt = fid->clnt;
1943
1944 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1945
1946 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1947 if (IS_ERR(req)) {
1948 err = PTR_ERR(req);
1949 goto error;
1950 }
1951
1952 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1953 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1954 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1955 if (err) {
1956 trace_9p_protocol_dump(clnt, &req->rc);
1957 p9_req_put(clnt, req);
1958 goto error;
1959 }
1960
1961 p9_debug(P9_DEBUG_9P,
1962 "<<< RSTATFS fid %d type 0x%x bsize %u blocks %llu bfree %llu bavail %llu files %llu ffree %llu fsid %llu namelen %u\n",
1963 fid->fid, sb->type, sb->bsize, sb->blocks, sb->bfree,
1964 sb->bavail, sb->files, sb->ffree, sb->fsid, sb->namelen);
1965
1966 p9_req_put(clnt, req);
1967 error:
1968 return err;
1969 }
1970 EXPORT_SYMBOL(p9_client_statfs);
1971
1972 int p9_client_rename(struct p9_fid *fid,
1973 struct p9_fid *newdirfid, const char *name)
1974 {
1975 int err = 0;
1976 struct p9_req_t *req;
1977 struct p9_client *clnt;
1978
1979 clnt = fid->clnt;
1980
1981 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1982 fid->fid, newdirfid->fid, name);
1983
1984 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1985 newdirfid->fid, name);
1986 if (IS_ERR(req)) {
1987 err = PTR_ERR(req);
1988 goto error;
1989 }
1990
1991 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1992
1993 p9_req_put(clnt, req);
1994 error:
1995 return err;
1996 }
1997 EXPORT_SYMBOL(p9_client_rename);
1998
1999 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
2000 struct p9_fid *newdirfid, const char *new_name)
2001 {
2002 int err = 0;
2003 struct p9_req_t *req;
2004 struct p9_client *clnt;
2005
2006 clnt = olddirfid->clnt;
2007
2008 p9_debug(P9_DEBUG_9P,
2009 ">>> TRENAMEAT olddirfid %d old name %s newdirfid %d new name %s\n",
2010 olddirfid->fid, old_name, newdirfid->fid, new_name);
2011
2012 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
2013 old_name, newdirfid->fid, new_name);
2014 if (IS_ERR(req)) {
2015 err = PTR_ERR(req);
2016 goto error;
2017 }
2018
2019 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
2020 newdirfid->fid, new_name);
2021
2022 p9_req_put(clnt, req);
2023 error:
2024 return err;
2025 }
2026 EXPORT_SYMBOL(p9_client_renameat);
2027
2028 /* An xattrwalk without @attr_name gives the fid for the lisxattr namespace
2029 */
2030 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
2031 const char *attr_name, u64 *attr_size)
2032 {
2033 int err;
2034 struct p9_req_t *req;
2035 struct p9_client *clnt;
2036 struct p9_fid *attr_fid;
2037
2038 clnt = file_fid->clnt;
2039 attr_fid = p9_fid_create(clnt);
2040 if (!attr_fid) {
2041 err = -ENOMEM;
2042 goto error;
2043 }
2044 p9_debug(P9_DEBUG_9P,
2045 ">>> TXATTRWALK file_fid %d, attr_fid %d name '%s'\n",
2046 file_fid->fid, attr_fid->fid, attr_name);
2047
2048 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2049 file_fid->fid, attr_fid->fid, attr_name);
2050 if (IS_ERR(req)) {
2051 err = PTR_ERR(req);
2052 goto error;
2053 }
2054 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size);
2055 if (err) {
2056 trace_9p_protocol_dump(clnt, &req->rc);
2057 p9_req_put(clnt, req);
2058 goto clunk_fid;
2059 }
2060 p9_req_put(clnt, req);
2061 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2062 attr_fid->fid, *attr_size);
2063 return attr_fid;
2064 clunk_fid:
2065 p9_fid_put(attr_fid);
2066 attr_fid = NULL;
2067 error:
2068 if (attr_fid && attr_fid != file_fid)
2069 p9_fid_destroy(attr_fid);
2070
2071 return ERR_PTR(err);
2072 }
2073 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2074
2075 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2076 u64 attr_size, int flags)
2077 {
2078 int err = 0;
2079 struct p9_req_t *req;
2080 struct p9_client *clnt;
2081
2082 p9_debug(P9_DEBUG_9P,
2083 ">>> TXATTRCREATE fid %d name %s size %llu flag %d\n",
2084 fid->fid, name, attr_size, flags);
2085 clnt = fid->clnt;
2086 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2087 fid->fid, name, attr_size, flags);
2088 if (IS_ERR(req)) {
2089 err = PTR_ERR(req);
2090 goto error;
2091 }
2092 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2093 p9_req_put(clnt, req);
2094 error:
2095 return err;
2096 }
2097 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2098
2099 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2100 {
2101 int err, rsize, non_zc = 0;
2102 struct p9_client *clnt;
2103 struct p9_req_t *req;
2104 char *dataptr;
2105 struct kvec kv = {.iov_base = data, .iov_len = count};
2106 struct iov_iter to;
2107
2108 iov_iter_kvec(&to, ITER_DEST, &kv, 1, count);
2109
2110 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2111 fid->fid, offset, count);
2112
2113 clnt = fid->clnt;
2114
2115 rsize = fid->iounit;
2116 if (!rsize || rsize > clnt->msize - P9_READDIRHDRSZ)
2117 rsize = clnt->msize - P9_READDIRHDRSZ;
2118
2119 if (count < rsize)
2120 rsize = count;
2121
2122 /* Don't bother zerocopy for small IO (< 1024) */
2123 if (clnt->trans_mod->zc_request && rsize > 1024) {
2124 /* response header len is 11
2125 * PDU Header(7) + IO Size (4)
2126 */
2127 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0,
2128 11, "dqd", fid->fid, offset, rsize);
2129 } else {
2130 non_zc = 1;
2131 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2132 offset, rsize);
2133 }
2134 if (IS_ERR(req)) {
2135 err = PTR_ERR(req);
2136 goto error;
2137 }
2138
2139 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr);
2140 if (err) {
2141 trace_9p_protocol_dump(clnt, &req->rc);
2142 goto free_and_error;
2143 }
2144 if (rsize < count) {
2145 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize);
2146 count = rsize;
2147 }
2148
2149 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2150
2151 if (non_zc)
2152 memmove(data, dataptr, count);
2153
2154 p9_req_put(clnt, req);
2155 return count;
2156
2157 free_and_error:
2158 p9_req_put(clnt, req);
2159 error:
2160 return err;
2161 }
2162 EXPORT_SYMBOL(p9_client_readdir);
2163
2164 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode,
2165 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2166 {
2167 int err;
2168 struct p9_client *clnt;
2169 struct p9_req_t *req;
2170
2171 clnt = fid->clnt;
2172 p9_debug(P9_DEBUG_9P,
2173 ">>> TMKNOD fid %d name %s mode %d major %d minor %d\n",
2174 fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2175 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2176 MAJOR(rdev), MINOR(rdev), 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, "<<< RMKNOD qid %x.%llx.%x\n",
2186 qid->type, qid->path, qid->version);
2187
2188 error:
2189 p9_req_put(clnt, req);
2190 return err;
2191 }
2192 EXPORT_SYMBOL(p9_client_mknod_dotl);
2193
2194 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode,
2195 kgid_t gid, struct p9_qid *qid)
2196 {
2197 int err;
2198 struct p9_client *clnt;
2199 struct p9_req_t *req;
2200
2201 clnt = fid->clnt;
2202 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2203 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2204 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg",
2205 fid->fid, name, mode, gid);
2206 if (IS_ERR(req))
2207 return PTR_ERR(req);
2208
2209 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
2210 if (err) {
2211 trace_9p_protocol_dump(clnt, &req->rc);
2212 goto error;
2213 }
2214 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2215 qid->path, qid->version);
2216
2217 error:
2218 p9_req_put(clnt, req);
2219 return err;
2220 }
2221 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2222
2223 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2224 {
2225 int err;
2226 struct p9_client *clnt;
2227 struct p9_req_t *req;
2228
2229 clnt = fid->clnt;
2230 p9_debug(P9_DEBUG_9P,
2231 ">>> TLOCK fid %d type %i flags %d start %lld length %lld proc_id %d client_id %s\n",
2232 fid->fid, flock->type, flock->flags, flock->start,
2233 flock->length, flock->proc_id, flock->client_id);
2234
2235 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2236 flock->flags, flock->start, flock->length,
2237 flock->proc_id, flock->client_id);
2238
2239 if (IS_ERR(req))
2240 return PTR_ERR(req);
2241
2242 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status);
2243 if (err) {
2244 trace_9p_protocol_dump(clnt, &req->rc);
2245 goto error;
2246 }
2247 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2248 error:
2249 p9_req_put(clnt, req);
2250 return err;
2251 }
2252 EXPORT_SYMBOL(p9_client_lock_dotl);
2253
2254 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2255 {
2256 int err;
2257 struct p9_client *clnt;
2258 struct p9_req_t *req;
2259
2260 clnt = fid->clnt;
2261 p9_debug(P9_DEBUG_9P,
2262 ">>> TGETLOCK fid %d, type %i start %lld length %lld proc_id %d client_id %s\n",
2263 fid->fid, glock->type, glock->start, glock->length,
2264 glock->proc_id, glock->client_id);
2265
2266 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid,
2267 glock->type, glock->start, glock->length,
2268 glock->proc_id, glock->client_id);
2269
2270 if (IS_ERR(req))
2271 return PTR_ERR(req);
2272
2273 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type,
2274 &glock->start, &glock->length, &glock->proc_id,
2275 &glock->client_id);
2276 if (err) {
2277 trace_9p_protocol_dump(clnt, &req->rc);
2278 goto error;
2279 }
2280 p9_debug(P9_DEBUG_9P,
2281 "<<< RGETLOCK type %i start %lld length %lld proc_id %d client_id %s\n",
2282 glock->type, glock->start, glock->length,
2283 glock->proc_id, glock->client_id);
2284 error:
2285 p9_req_put(clnt, req);
2286 return err;
2287 }
2288 EXPORT_SYMBOL(p9_client_getlock_dotl);
2289
2290 int p9_client_readlink(struct p9_fid *fid, char **target)
2291 {
2292 int err;
2293 struct p9_client *clnt;
2294 struct p9_req_t *req;
2295
2296 clnt = fid->clnt;
2297 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2298
2299 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2300 if (IS_ERR(req))
2301 return PTR_ERR(req);
2302
2303 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target);
2304 if (err) {
2305 trace_9p_protocol_dump(clnt, &req->rc);
2306 goto error;
2307 }
2308 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2309 error:
2310 p9_req_put(clnt, req);
2311 return err;
2312 }
2313 EXPORT_SYMBOL(p9_client_readlink);
2314
2315 int __init p9_client_init(void)
2316 {
2317 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU);
2318 return p9_req_cache ? 0 : -ENOMEM;
2319 }
2320
2321 void __exit p9_client_exit(void)
2322 {
2323 kmem_cache_destroy(p9_req_cache);
2324 }
Linux Kernel