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 #define DEFAULT_MSIZE (128 * 1024)
34
35 /*
36 * Client Option Parsing (code inspired by NFS code)
37 * - a little lazy - parse all client options
38 */
39
40 enum {
41 Opt_msize,
42 Opt_trans,
43 Opt_legacy,
44 Opt_version,
45 Opt_err,
46 };
47
48 static const match_table_t tokens = {
49 {Opt_msize, "msize=%u"},
50 {Opt_legacy, "noextend"},
51 {Opt_trans, "trans=%s"},
52 {Opt_version, "version=%s"},
53 {Opt_err, NULL},
54 };
55
p9_is_proto_dotl(struct p9_client * clnt)56 inline int p9_is_proto_dotl(struct p9_client *clnt)
57 {
58 return clnt->proto_version == p9_proto_2000L;
59 }
60 EXPORT_SYMBOL(p9_is_proto_dotl);
61
p9_is_proto_dotu(struct p9_client * clnt)62 inline int p9_is_proto_dotu(struct p9_client *clnt)
63 {
64 return clnt->proto_version == p9_proto_2000u;
65 }
66 EXPORT_SYMBOL(p9_is_proto_dotu);
67
p9_show_client_options(struct seq_file * m,struct p9_client * clnt)68 int p9_show_client_options(struct seq_file *m, struct p9_client *clnt)
69 {
70 if (clnt->msize != DEFAULT_MSIZE)
71 seq_printf(m, ",msize=%u", clnt->msize);
72 seq_printf(m, ",trans=%s", clnt->trans_mod->name);
73
74 switch (clnt->proto_version) {
75 case p9_proto_legacy:
76 seq_puts(m, ",noextend");
77 break;
78 case p9_proto_2000u:
79 seq_puts(m, ",version=9p2000.u");
80 break;
81 case p9_proto_2000L:
82 /* Default */
83 break;
84 }
85
86 if (clnt->trans_mod->show_options)
87 return clnt->trans_mod->show_options(m, clnt);
88 return 0;
89 }
90 EXPORT_SYMBOL(p9_show_client_options);
91
92 /*
93 * Some error codes are taken directly from the server replies,
94 * make sure they are valid.
95 */
safe_errno(int err)96 static int safe_errno(int err)
97 {
98 if ((err > 0) || (err < -MAX_ERRNO)) {
99 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err);
100 return -EPROTO;
101 }
102 return err;
103 }
104
105
106 /* Interpret mount option for protocol version */
get_protocol_version(char * s)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 return version;
124 }
125
126 /**
127 * parse_opts - parse mount options into client structure
128 * @opts: options string passed from mount
129 * @clnt: existing v9fs client information
130 *
131 * Return 0 upon success, -ERRNO upon failure
132 */
133
parse_opts(char * opts,struct p9_client * clnt)134 static int parse_opts(char *opts, struct p9_client *clnt)
135 {
136 char *options, *tmp_options;
137 char *p;
138 substring_t args[MAX_OPT_ARGS];
139 int option;
140 char *s;
141 int ret = 0;
142
143 clnt->proto_version = p9_proto_2000L;
144 clnt->msize = DEFAULT_MSIZE;
145
146 if (!opts)
147 return 0;
148
149 tmp_options = kstrdup(opts, GFP_KERNEL);
150 if (!tmp_options) {
151 p9_debug(P9_DEBUG_ERROR,
152 "failed to allocate copy of option string\n");
153 return -ENOMEM;
154 }
155 options = tmp_options;
156
157 while ((p = strsep(&options, ",")) != NULL) {
158 int token, r;
159 if (!*p)
160 continue;
161 token = match_token(p, tokens, args);
162 switch (token) {
163 case Opt_msize:
164 r = match_int(&args[0], &option);
165 if (r < 0) {
166 p9_debug(P9_DEBUG_ERROR,
167 "integer field, but no integer?\n");
168 ret = r;
169 continue;
170 }
171 if (option < 4096) {
172 p9_debug(P9_DEBUG_ERROR,
173 "msize should be at least 4k\n");
174 ret = -EINVAL;
175 continue;
176 }
177 clnt->msize = option;
178 break;
179 case Opt_trans:
180 s = match_strdup(&args[0]);
181 if (!s) {
182 ret = -ENOMEM;
183 p9_debug(P9_DEBUG_ERROR,
184 "problem allocating copy of trans arg\n");
185 goto free_and_return;
186 }
187
188 v9fs_put_trans(clnt->trans_mod);
189 clnt->trans_mod = v9fs_get_trans_by_name(s);
190 if (clnt->trans_mod == NULL) {
191 pr_info("Could not find request transport: %s\n",
192 s);
193 ret = -EINVAL;
194 }
195 kfree(s);
196 break;
197 case Opt_legacy:
198 clnt->proto_version = p9_proto_legacy;
199 break;
200 case Opt_version:
201 s = match_strdup(&args[0]);
202 if (!s) {
203 ret = -ENOMEM;
204 p9_debug(P9_DEBUG_ERROR,
205 "problem allocating copy of version arg\n");
206 goto free_and_return;
207 }
208 r = get_protocol_version(s);
209 if (r < 0)
210 ret = r;
211 else
212 clnt->proto_version = r;
213 kfree(s);
214 break;
215 default:
216 continue;
217 }
218 }
219
220 free_and_return:
221 if (ret)
222 v9fs_put_trans(clnt->trans_mod);
223 kfree(tmp_options);
224 return ret;
225 }
226
p9_fcall_init(struct p9_client * c,struct p9_fcall * fc,int alloc_msize)227 static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc,
228 int alloc_msize)
229 {
230 if (likely(c->fcall_cache) && alloc_msize == c->msize) {
231 fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS);
232 fc->cache = c->fcall_cache;
233 } else {
234 fc->sdata = kmalloc(alloc_msize, GFP_NOFS);
235 fc->cache = NULL;
236 }
237 if (!fc->sdata)
238 return -ENOMEM;
239 fc->capacity = alloc_msize;
240 return 0;
241 }
242
p9_fcall_fini(struct p9_fcall * fc)243 void p9_fcall_fini(struct p9_fcall *fc)
244 {
245 /* sdata can be NULL for interrupted requests in trans_rdma,
246 * and kmem_cache_free does not do NULL-check for us
247 */
248 if (unlikely(!fc->sdata))
249 return;
250
251 if (fc->cache)
252 kmem_cache_free(fc->cache, fc->sdata);
253 else
254 kfree(fc->sdata);
255 }
256 EXPORT_SYMBOL(p9_fcall_fini);
257
258 static struct kmem_cache *p9_req_cache;
259
260 /**
261 * p9_tag_alloc - Allocate a new request.
262 * @c: Client session.
263 * @type: Transaction type.
264 * @max_size: Maximum packet size for this request.
265 *
266 * Context: Process context.
267 * Return: Pointer to new request.
268 */
269 static struct p9_req_t *
p9_tag_alloc(struct p9_client * c,int8_t type,unsigned int max_size)270 p9_tag_alloc(struct p9_client *c, int8_t type, unsigned int max_size)
271 {
272 struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS);
273 int alloc_msize = min(c->msize, max_size);
274 int tag;
275
276 if (!req)
277 return ERR_PTR(-ENOMEM);
278
279 if (p9_fcall_init(c, &req->tc, alloc_msize))
280 goto free_req;
281 if (p9_fcall_init(c, &req->rc, alloc_msize))
282 goto free;
283
284 p9pdu_reset(&req->tc);
285 p9pdu_reset(&req->rc);
286 req->t_err = 0;
287 req->status = REQ_STATUS_ALLOC;
288 init_waitqueue_head(&req->wq);
289 INIT_LIST_HEAD(&req->req_list);
290
291 idr_preload(GFP_NOFS);
292 spin_lock_irq(&c->lock);
293 if (type == P9_TVERSION)
294 tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1,
295 GFP_NOWAIT);
296 else
297 tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT);
298 req->tc.tag = tag;
299 spin_unlock_irq(&c->lock);
300 idr_preload_end();
301 if (tag < 0)
302 goto free;
303
304 /* Init ref to two because in the general case there is one ref
305 * that is put asynchronously by a writer thread, one ref
306 * temporarily given by p9_tag_lookup and put by p9_client_cb
307 * in the recv thread, and one ref put by p9_tag_remove in the
308 * main thread. The only exception is virtio that does not use
309 * p9_tag_lookup but does not have a writer thread either
310 * (the write happens synchronously in the request/zc_request
311 * callback), so p9_client_cb eats the second ref there
312 * as the pointer is duplicated directly by virtqueue_add_sgs()
313 */
314 refcount_set(&req->refcount.refcount, 2);
315
316 return req;
317
318 free:
319 p9_fcall_fini(&req->tc);
320 p9_fcall_fini(&req->rc);
321 free_req:
322 kmem_cache_free(p9_req_cache, req);
323 return ERR_PTR(-ENOMEM);
324 }
325
326 /**
327 * p9_tag_lookup - Look up a request by tag.
328 * @c: Client session.
329 * @tag: Transaction ID.
330 *
331 * Context: Any context.
332 * Return: A request, or %NULL if there is no request with that tag.
333 */
p9_tag_lookup(struct p9_client * c,u16 tag)334 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
335 {
336 struct p9_req_t *req;
337
338 rcu_read_lock();
339 again:
340 req = idr_find(&c->reqs, tag);
341 if (req) {
342 /* We have to be careful with the req found under rcu_read_lock
343 * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the
344 * ref again without corrupting other data, then check again
345 * that the tag matches once we have the ref
346 */
347 if (!p9_req_try_get(req))
348 goto again;
349 if (req->tc.tag != tag) {
350 p9_req_put(req);
351 goto again;
352 }
353 }
354 rcu_read_unlock();
355
356 return req;
357 }
358 EXPORT_SYMBOL(p9_tag_lookup);
359
360 /**
361 * p9_tag_remove - Remove a tag.
362 * @c: Client session.
363 * @r: Request of reference.
364 *
365 * Context: Any context.
366 */
p9_tag_remove(struct p9_client * c,struct p9_req_t * r)367 static int p9_tag_remove(struct p9_client *c, struct p9_req_t *r)
368 {
369 unsigned long flags;
370 u16 tag = r->tc.tag;
371
372 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
373 spin_lock_irqsave(&c->lock, flags);
374 idr_remove(&c->reqs, tag);
375 spin_unlock_irqrestore(&c->lock, flags);
376 return p9_req_put(r);
377 }
378
p9_req_free(struct kref * ref)379 static void p9_req_free(struct kref *ref)
380 {
381 struct p9_req_t *r = container_of(ref, struct p9_req_t, refcount);
382 p9_fcall_fini(&r->tc);
383 p9_fcall_fini(&r->rc);
384 kmem_cache_free(p9_req_cache, r);
385 }
386
p9_req_put(struct p9_req_t * r)387 int p9_req_put(struct p9_req_t *r)
388 {
389 return kref_put(&r->refcount, p9_req_free);
390 }
391 EXPORT_SYMBOL(p9_req_put);
392
393 /**
394 * p9_tag_cleanup - cleans up tags structure and reclaims resources
395 * @c: v9fs client struct
396 *
397 * This frees resources associated with the tags structure
398 *
399 */
p9_tag_cleanup(struct p9_client * c)400 static void p9_tag_cleanup(struct p9_client *c)
401 {
402 struct p9_req_t *req;
403 int id;
404
405 rcu_read_lock();
406 idr_for_each_entry(&c->reqs, req, id) {
407 pr_info("Tag %d still in use\n", id);
408 if (p9_tag_remove(c, req) == 0)
409 pr_warn("Packet with tag %d has still references",
410 req->tc.tag);
411 }
412 rcu_read_unlock();
413 }
414
415 /**
416 * p9_client_cb - call back from transport to client
417 * @c: client state
418 * @req: request received
419 * @status: request status, one of REQ_STATUS_*
420 *
421 */
p9_client_cb(struct p9_client * c,struct p9_req_t * req,int status)422 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
423 {
424 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag);
425
426 /*
427 * This barrier is needed to make sure any change made to req before
428 * the status change is visible to another thread
429 */
430 smp_wmb();
431 req->status = status;
432
433 wake_up(&req->wq);
434 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag);
435 p9_req_put(req);
436 }
437 EXPORT_SYMBOL(p9_client_cb);
438
439 /**
440 * p9_parse_header - parse header arguments out of a packet
441 * @pdu: packet to parse
442 * @size: size of packet
443 * @type: type of request
444 * @tag: tag of packet
445 * @rewind: set if we need to rewind offset afterwards
446 */
447
448 int
p9_parse_header(struct p9_fcall * pdu,int32_t * size,int8_t * type,int16_t * tag,int rewind)449 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
450 int rewind)
451 {
452 int8_t r_type;
453 int16_t r_tag;
454 int32_t r_size;
455 int offset = pdu->offset;
456 int err;
457
458 pdu->offset = 0;
459
460 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
461 if (err)
462 goto rewind_and_exit;
463
464 if (type)
465 *type = r_type;
466 if (tag)
467 *tag = r_tag;
468 if (size)
469 *size = r_size;
470
471 if (pdu->size != r_size || r_size < 7) {
472 err = -EINVAL;
473 goto rewind_and_exit;
474 }
475
476 pdu->id = r_type;
477 pdu->tag = r_tag;
478
479 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
480 pdu->size, pdu->id, pdu->tag);
481
482 rewind_and_exit:
483 if (rewind)
484 pdu->offset = offset;
485 return err;
486 }
487 EXPORT_SYMBOL(p9_parse_header);
488
489 /**
490 * p9_check_errors - check 9p packet for error return and process it
491 * @c: current client instance
492 * @req: request to parse and check for error conditions
493 *
494 * returns error code if one is discovered, otherwise returns 0
495 *
496 * this will have to be more complicated if we have multiple
497 * error packet types
498 */
499
p9_check_errors(struct p9_client * c,struct p9_req_t * req)500 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
501 {
502 int8_t type;
503 int err;
504 int ecode;
505
506 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0);
507 if (req->rc.size >= c->msize) {
508 p9_debug(P9_DEBUG_ERROR,
509 "requested packet size too big: %d\n",
510 req->rc.size);
511 return -EIO;
512 }
513 /*
514 * dump the response from server
515 * This should be after check errors which poplulate pdu_fcall.
516 */
517 trace_9p_protocol_dump(c, &req->rc);
518 if (err) {
519 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
520 return err;
521 }
522 if (type != P9_RERROR && type != P9_RLERROR)
523 return 0;
524
525 if (!p9_is_proto_dotl(c)) {
526 char *ename;
527 err = p9pdu_readf(&req->rc, c->proto_version, "s?d",
528 &ename, &ecode);
529 if (err)
530 goto out_err;
531
532 if (p9_is_proto_dotu(c) && ecode < 512)
533 err = -ecode;
534
535 if (!err) {
536 err = p9_errstr2errno(ename, strlen(ename));
537
538 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
539 -ecode, ename);
540 }
541 kfree(ename);
542 } else {
543 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode);
544 err = -ecode;
545
546 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
547 }
548
549 return err;
550
551 out_err:
552 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
553
554 return err;
555 }
556
557 /**
558 * p9_check_zc_errors - check 9p packet for error return and process it
559 * @c: current client instance
560 * @req: request to parse and check for error conditions
561 * @uidata: external buffer containing error
562 * @in_hdrlen: Size of response protocol buffer.
563 *
564 * returns error code if one is discovered, otherwise returns 0
565 *
566 * this will have to be more complicated if we have multiple
567 * error packet types
568 */
569
p9_check_zc_errors(struct p9_client * c,struct p9_req_t * req,struct iov_iter * uidata,int in_hdrlen)570 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
571 struct iov_iter *uidata, int in_hdrlen)
572 {
573 int err;
574 int ecode;
575 int8_t type;
576 char *ename = NULL;
577
578 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0);
579 /*
580 * dump the response from server
581 * This should be after parse_header which poplulate pdu_fcall.
582 */
583 trace_9p_protocol_dump(c, &req->rc);
584 if (err) {
585 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
586 return err;
587 }
588
589 if (type != P9_RERROR && type != P9_RLERROR)
590 return 0;
591
592 if (!p9_is_proto_dotl(c)) {
593 /* Error is reported in string format */
594 int len;
595 /* 7 = header size for RERROR; */
596 int inline_len = in_hdrlen - 7;
597
598 len = req->rc.size - req->rc.offset;
599 if (len > (P9_ZC_HDR_SZ - 7)) {
600 err = -EFAULT;
601 goto out_err;
602 }
603
604 ename = &req->rc.sdata[req->rc.offset];
605 if (len > inline_len) {
606 /* We have error in external buffer */
607 if (!copy_from_iter_full(ename + inline_len,
608 len - inline_len, uidata)) {
609 err = -EFAULT;
610 goto out_err;
611 }
612 }
613 ename = NULL;
614 err = p9pdu_readf(&req->rc, c->proto_version, "s?d",
615 &ename, &ecode);
616 if (err)
617 goto out_err;
618
619 if (p9_is_proto_dotu(c) && ecode < 512)
620 err = -ecode;
621
622 if (!err) {
623 err = p9_errstr2errno(ename, strlen(ename));
624
625 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
626 -ecode, ename);
627 }
628 kfree(ename);
629 } else {
630 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode);
631 err = -ecode;
632
633 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
634 }
635 return err;
636
637 out_err:
638 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
639 return err;
640 }
641
642 static struct p9_req_t *
643 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
644
645 /**
646 * p9_client_flush - flush (cancel) a request
647 * @c: client state
648 * @oldreq: request to cancel
649 *
650 * This sents a flush for a particular request and links
651 * the flush request to the original request. The current
652 * code only supports a single flush request although the protocol
653 * allows for multiple flush requests to be sent for a single request.
654 *
655 */
656
p9_client_flush(struct p9_client * c,struct p9_req_t * oldreq)657 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
658 {
659 struct p9_req_t *req;
660 int16_t oldtag;
661 int err;
662
663 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1);
664 if (err)
665 return err;
666
667 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
668
669 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
670 if (IS_ERR(req))
671 return PTR_ERR(req);
672
673 /*
674 * if we haven't received a response for oldreq,
675 * remove it from the list
676 */
677 if (oldreq->status == REQ_STATUS_SENT) {
678 if (c->trans_mod->cancelled)
679 c->trans_mod->cancelled(c, oldreq);
680 }
681
682 p9_tag_remove(c, req);
683 return 0;
684 }
685
p9_client_prepare_req(struct p9_client * c,int8_t type,int req_size,const char * fmt,va_list ap)686 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
687 int8_t type, int req_size,
688 const char *fmt, va_list ap)
689 {
690 int err;
691 struct p9_req_t *req;
692
693 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
694
695 /* we allow for any status other than disconnected */
696 if (c->status == Disconnected)
697 return ERR_PTR(-EIO);
698
699 /* if status is begin_disconnected we allow only clunk request */
700 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
701 return ERR_PTR(-EIO);
702
703 req = p9_tag_alloc(c, type, req_size);
704 if (IS_ERR(req))
705 return req;
706
707 /* marshall the data */
708 p9pdu_prepare(&req->tc, req->tc.tag, type);
709 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap);
710 if (err)
711 goto reterr;
712 p9pdu_finalize(c, &req->tc);
713 trace_9p_client_req(c, type, req->tc.tag);
714 return req;
715 reterr:
716 p9_tag_remove(c, req);
717 /* We have to put also the 2nd reference as it won't be used */
718 p9_req_put(req);
719 return ERR_PTR(err);
720 }
721
722 /**
723 * p9_client_rpc - issue a request and wait for a response
724 * @c: client session
725 * @type: type of request
726 * @fmt: protocol format string (see protocol.c)
727 *
728 * Returns request structure (which client must free using p9_tag_remove)
729 */
730
731 static struct p9_req_t *
p9_client_rpc(struct p9_client * c,int8_t type,const char * fmt,...)732 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
733 {
734 va_list ap;
735 int sigpending, err;
736 unsigned long flags;
737 struct p9_req_t *req;
738
739 va_start(ap, fmt);
740 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
741 va_end(ap);
742 if (IS_ERR(req))
743 return req;
744
745 if (signal_pending(current)) {
746 sigpending = 1;
747 clear_thread_flag(TIF_SIGPENDING);
748 } else
749 sigpending = 0;
750
751 err = c->trans_mod->request(c, req);
752 if (err < 0) {
753 /* write won't happen */
754 p9_req_put(req);
755 if (err != -ERESTARTSYS && err != -EFAULT)
756 c->status = Disconnected;
757 goto recalc_sigpending;
758 }
759 again:
760 /* Wait for the response */
761 err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD);
762
763 /*
764 * Make sure our req is coherent with regard to updates in other
765 * threads - echoes to wmb() in the callback
766 */
767 smp_rmb();
768
769 if ((err == -ERESTARTSYS) && (c->status == Connected)
770 && (type == P9_TFLUSH)) {
771 sigpending = 1;
772 clear_thread_flag(TIF_SIGPENDING);
773 goto again;
774 }
775
776 if (req->status == REQ_STATUS_ERROR) {
777 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
778 err = req->t_err;
779 }
780 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
781 p9_debug(P9_DEBUG_MUX, "flushing\n");
782 sigpending = 1;
783 clear_thread_flag(TIF_SIGPENDING);
784
785 if (c->trans_mod->cancel(c, req))
786 p9_client_flush(c, req);
787
788 /* if we received the response anyway, don't signal error */
789 if (req->status == REQ_STATUS_RCVD)
790 err = 0;
791 }
792 recalc_sigpending:
793 if (sigpending) {
794 spin_lock_irqsave(¤t->sighand->siglock, flags);
795 recalc_sigpending();
796 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
797 }
798 if (err < 0)
799 goto reterr;
800
801 err = p9_check_errors(c, req);
802 trace_9p_client_res(c, type, req->rc.tag, err);
803 if (!err)
804 return req;
805 reterr:
806 p9_tag_remove(c, req);
807 return ERR_PTR(safe_errno(err));
808 }
809
810 /**
811 * p9_client_zc_rpc - issue a request and wait for a response
812 * @c: client session
813 * @type: type of request
814 * @uidata: destination for zero copy read
815 * @uodata: source for zero copy write
816 * @inlen: read buffer size
817 * @olen: write buffer size
818 * @in_hdrlen: reader header size, This is the size of response protocol data
819 * @fmt: protocol format string (see protocol.c)
820 *
821 * Returns request structure (which client must free using p9_tag_remove)
822 */
p9_client_zc_rpc(struct p9_client * c,int8_t type,struct iov_iter * uidata,struct iov_iter * uodata,int inlen,int olen,int in_hdrlen,const char * fmt,...)823 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
824 struct iov_iter *uidata,
825 struct iov_iter *uodata,
826 int inlen, int olen, int in_hdrlen,
827 const char *fmt, ...)
828 {
829 va_list ap;
830 int sigpending, err;
831 unsigned long flags;
832 struct p9_req_t *req;
833
834 va_start(ap, fmt);
835 /*
836 * We allocate a inline protocol data of only 4k bytes.
837 * The actual content is passed in zero-copy fashion.
838 */
839 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
840 va_end(ap);
841 if (IS_ERR(req))
842 return req;
843
844 if (signal_pending(current)) {
845 sigpending = 1;
846 clear_thread_flag(TIF_SIGPENDING);
847 } else
848 sigpending = 0;
849
850 err = c->trans_mod->zc_request(c, req, uidata, uodata,
851 inlen, olen, in_hdrlen);
852 if (err < 0) {
853 if (err == -EIO)
854 c->status = Disconnected;
855 if (err != -ERESTARTSYS)
856 goto recalc_sigpending;
857 }
858 if (req->status == REQ_STATUS_ERROR) {
859 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
860 err = req->t_err;
861 }
862 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
863 p9_debug(P9_DEBUG_MUX, "flushing\n");
864 sigpending = 1;
865 clear_thread_flag(TIF_SIGPENDING);
866
867 if (c->trans_mod->cancel(c, req))
868 p9_client_flush(c, req);
869
870 /* if we received the response anyway, don't signal error */
871 if (req->status == REQ_STATUS_RCVD)
872 err = 0;
873 }
874 recalc_sigpending:
875 if (sigpending) {
876 spin_lock_irqsave(¤t->sighand->siglock, flags);
877 recalc_sigpending();
878 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
879 }
880 if (err < 0)
881 goto reterr;
882
883 err = p9_check_zc_errors(c, req, uidata, in_hdrlen);
884 trace_9p_client_res(c, type, req->rc.tag, err);
885 if (!err)
886 return req;
887 reterr:
888 p9_tag_remove(c, req);
889 return ERR_PTR(safe_errno(err));
890 }
891
p9_fid_create(struct p9_client * clnt)892 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
893 {
894 int ret;
895 struct p9_fid *fid;
896
897 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
898 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
899 if (!fid)
900 return NULL;
901
902 memset(&fid->qid, 0, sizeof(struct p9_qid));
903 fid->mode = -1;
904 fid->uid = current_fsuid();
905 fid->clnt = clnt;
906 fid->rdir = NULL;
907 fid->fid = 0;
908 refcount_set(&fid->count, 1);
909
910 idr_preload(GFP_KERNEL);
911 spin_lock_irq(&clnt->lock);
912 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1,
913 GFP_NOWAIT);
914 spin_unlock_irq(&clnt->lock);
915 idr_preload_end();
916 if (!ret)
917 return fid;
918
919 kfree(fid);
920 return NULL;
921 }
922
p9_fid_destroy(struct p9_fid * fid)923 static void p9_fid_destroy(struct p9_fid *fid)
924 {
925 struct p9_client *clnt;
926 unsigned long flags;
927
928 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
929 clnt = fid->clnt;
930 spin_lock_irqsave(&clnt->lock, flags);
931 idr_remove(&clnt->fids, fid->fid);
932 spin_unlock_irqrestore(&clnt->lock, flags);
933 kfree(fid->rdir);
934 kfree(fid);
935 }
936
p9_client_version(struct p9_client * c)937 static int p9_client_version(struct p9_client *c)
938 {
939 int err = 0;
940 struct p9_req_t *req;
941 char *version = NULL;
942 int msize;
943
944 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
945 c->msize, c->proto_version);
946
947 switch (c->proto_version) {
948 case p9_proto_2000L:
949 req = p9_client_rpc(c, P9_TVERSION, "ds",
950 c->msize, "9P2000.L");
951 break;
952 case p9_proto_2000u:
953 req = p9_client_rpc(c, P9_TVERSION, "ds",
954 c->msize, "9P2000.u");
955 break;
956 case p9_proto_legacy:
957 req = p9_client_rpc(c, P9_TVERSION, "ds",
958 c->msize, "9P2000");
959 break;
960 default:
961 return -EINVAL;
962 }
963
964 if (IS_ERR(req))
965 return PTR_ERR(req);
966
967 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version);
968 if (err) {
969 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
970 trace_9p_protocol_dump(c, &req->rc);
971 goto error;
972 }
973
974 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
975 if (!strncmp(version, "9P2000.L", 8))
976 c->proto_version = p9_proto_2000L;
977 else if (!strncmp(version, "9P2000.u", 8))
978 c->proto_version = p9_proto_2000u;
979 else if (!strncmp(version, "9P2000", 6))
980 c->proto_version = p9_proto_legacy;
981 else {
982 p9_debug(P9_DEBUG_ERROR,
983 "server returned an unknown version: %s\n", version);
984 err = -EREMOTEIO;
985 goto error;
986 }
987
988 if (msize < 4096) {
989 p9_debug(P9_DEBUG_ERROR,
990 "server returned a msize < 4096: %d\n", msize);
991 err = -EREMOTEIO;
992 goto error;
993 }
994 if (msize < c->msize)
995 c->msize = msize;
996
997 error:
998 kfree(version);
999 p9_tag_remove(c, req);
1000
1001 return err;
1002 }
1003
p9_client_create(const char * dev_name,char * options)1004 struct p9_client *p9_client_create(const char *dev_name, char *options)
1005 {
1006 int err;
1007 struct p9_client *clnt;
1008 char *client_id;
1009
1010 err = 0;
1011 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
1012 if (!clnt)
1013 return ERR_PTR(-ENOMEM);
1014
1015 clnt->trans_mod = NULL;
1016 clnt->trans = NULL;
1017 clnt->fcall_cache = NULL;
1018
1019 client_id = utsname()->nodename;
1020 memcpy(clnt->name, client_id, strlen(client_id) + 1);
1021
1022 spin_lock_init(&clnt->lock);
1023 idr_init(&clnt->fids);
1024 idr_init(&clnt->reqs);
1025
1026 err = parse_opts(options, clnt);
1027 if (err < 0)
1028 goto free_client;
1029
1030 if (!clnt->trans_mod)
1031 clnt->trans_mod = v9fs_get_default_trans();
1032
1033 if (clnt->trans_mod == NULL) {
1034 err = -EPROTONOSUPPORT;
1035 p9_debug(P9_DEBUG_ERROR,
1036 "No transport defined or default transport\n");
1037 goto free_client;
1038 }
1039
1040 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1041 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1042
1043 err = clnt->trans_mod->create(clnt, dev_name, options);
1044 if (err)
1045 goto put_trans;
1046
1047 if (clnt->msize > clnt->trans_mod->maxsize)
1048 clnt->msize = clnt->trans_mod->maxsize;
1049
1050 if (clnt->msize < 4096) {
1051 p9_debug(P9_DEBUG_ERROR,
1052 "Please specify a msize of at least 4k\n");
1053 err = -EINVAL;
1054 goto close_trans;
1055 }
1056
1057 err = p9_client_version(clnt);
1058 if (err)
1059 goto close_trans;
1060
1061 /* P9_HDRSZ + 4 is the smallest packet header we can have that is
1062 * followed by data accessed from userspace by read
1063 */
1064 clnt->fcall_cache =
1065 kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize,
1066 0, 0, P9_HDRSZ + 4,
1067 clnt->msize - (P9_HDRSZ + 4),
1068 NULL);
1069
1070 return clnt;
1071
1072 close_trans:
1073 clnt->trans_mod->close(clnt);
1074 put_trans:
1075 v9fs_put_trans(clnt->trans_mod);
1076 free_client:
1077 kfree(clnt);
1078 return ERR_PTR(err);
1079 }
1080 EXPORT_SYMBOL(p9_client_create);
1081
p9_client_destroy(struct p9_client * clnt)1082 void p9_client_destroy(struct p9_client *clnt)
1083 {
1084 struct p9_fid *fid;
1085 int id;
1086
1087 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1088
1089 if (clnt->trans_mod)
1090 clnt->trans_mod->close(clnt);
1091
1092 v9fs_put_trans(clnt->trans_mod);
1093
1094 idr_for_each_entry(&clnt->fids, fid, id) {
1095 pr_info("Found fid %d not clunked\n", fid->fid);
1096 p9_fid_destroy(fid);
1097 }
1098
1099 p9_tag_cleanup(clnt);
1100
1101 kmem_cache_destroy(clnt->fcall_cache);
1102 kfree(clnt);
1103 }
1104 EXPORT_SYMBOL(p9_client_destroy);
1105
p9_client_disconnect(struct p9_client * clnt)1106 void p9_client_disconnect(struct p9_client *clnt)
1107 {
1108 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1109 clnt->status = Disconnected;
1110 }
1111 EXPORT_SYMBOL(p9_client_disconnect);
1112
p9_client_begin_disconnect(struct p9_client * clnt)1113 void p9_client_begin_disconnect(struct p9_client *clnt)
1114 {
1115 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1116 clnt->status = BeginDisconnect;
1117 }
1118 EXPORT_SYMBOL(p9_client_begin_disconnect);
1119
p9_client_attach(struct p9_client * clnt,struct p9_fid * afid,const char * uname,kuid_t n_uname,const char * aname)1120 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1121 const char *uname, kuid_t n_uname, const char *aname)
1122 {
1123 int err = 0;
1124 struct p9_req_t *req;
1125 struct p9_fid *fid;
1126 struct p9_qid qid;
1127
1128
1129 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1130 afid ? afid->fid : -1, uname, aname);
1131 fid = p9_fid_create(clnt);
1132 if (!fid) {
1133 err = -ENOMEM;
1134 goto error;
1135 }
1136 fid->uid = n_uname;
1137
1138 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1139 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1140 if (IS_ERR(req)) {
1141 err = PTR_ERR(req);
1142 goto error;
1143 }
1144
1145 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid);
1146 if (err) {
1147 trace_9p_protocol_dump(clnt, &req->rc);
1148 p9_tag_remove(clnt, req);
1149 goto error;
1150 }
1151
1152 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1153 qid.type, (unsigned long long)qid.path, qid.version);
1154
1155 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1156
1157 p9_tag_remove(clnt, req);
1158 return fid;
1159
1160 error:
1161 if (fid)
1162 p9_fid_destroy(fid);
1163 return ERR_PTR(err);
1164 }
1165 EXPORT_SYMBOL(p9_client_attach);
1166
p9_client_walk(struct p9_fid * oldfid,uint16_t nwname,const unsigned char * const * wnames,int clone)1167 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1168 const unsigned char * const *wnames, int clone)
1169 {
1170 int err;
1171 struct p9_client *clnt;
1172 struct p9_fid *fid;
1173 struct p9_qid *wqids;
1174 struct p9_req_t *req;
1175 uint16_t nwqids, count;
1176
1177 err = 0;
1178 wqids = NULL;
1179 clnt = oldfid->clnt;
1180 if (clone) {
1181 fid = p9_fid_create(clnt);
1182 if (!fid) {
1183 err = -ENOMEM;
1184 goto error;
1185 }
1186
1187 fid->uid = oldfid->uid;
1188 } else
1189 fid = oldfid;
1190
1191
1192 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1193 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1194 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1195 nwname, wnames);
1196 if (IS_ERR(req)) {
1197 err = PTR_ERR(req);
1198 goto error;
1199 }
1200
1201 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1202 if (err) {
1203 trace_9p_protocol_dump(clnt, &req->rc);
1204 p9_tag_remove(clnt, req);
1205 goto clunk_fid;
1206 }
1207 p9_tag_remove(clnt, req);
1208
1209 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1210
1211 if (nwqids != nwname) {
1212 err = -ENOENT;
1213 goto clunk_fid;
1214 }
1215
1216 for (count = 0; count < nwqids; count++)
1217 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1218 count, wqids[count].type,
1219 (unsigned long long)wqids[count].path,
1220 wqids[count].version);
1221
1222 if (nwname)
1223 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1224 else
1225 memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid));
1226
1227 kfree(wqids);
1228 return fid;
1229
1230 clunk_fid:
1231 kfree(wqids);
1232 p9_client_clunk(fid);
1233 fid = NULL;
1234
1235 error:
1236 if (fid && (fid != oldfid))
1237 p9_fid_destroy(fid);
1238
1239 return ERR_PTR(err);
1240 }
1241 EXPORT_SYMBOL(p9_client_walk);
1242
p9_client_open(struct p9_fid * fid,int mode)1243 int p9_client_open(struct p9_fid *fid, int mode)
1244 {
1245 int err;
1246 struct p9_client *clnt;
1247 struct p9_req_t *req;
1248 struct p9_qid qid;
1249 int iounit;
1250
1251 clnt = fid->clnt;
1252 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1253 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1254 err = 0;
1255
1256 if (fid->mode != -1)
1257 return -EINVAL;
1258
1259 if (p9_is_proto_dotl(clnt))
1260 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1261 else
1262 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1263 if (IS_ERR(req)) {
1264 err = PTR_ERR(req);
1265 goto error;
1266 }
1267
1268 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1269 if (err) {
1270 trace_9p_protocol_dump(clnt, &req->rc);
1271 goto free_and_error;
1272 }
1273
1274 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1275 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1276 (unsigned long long)qid.path, qid.version, iounit);
1277
1278 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1279 fid->mode = mode;
1280 fid->iounit = iounit;
1281
1282 free_and_error:
1283 p9_tag_remove(clnt, req);
1284 error:
1285 return err;
1286 }
1287 EXPORT_SYMBOL(p9_client_open);
1288
p9_client_create_dotl(struct p9_fid * ofid,const char * name,u32 flags,u32 mode,kgid_t gid,struct p9_qid * qid)1289 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode,
1290 kgid_t gid, struct p9_qid *qid)
1291 {
1292 int err = 0;
1293 struct p9_client *clnt;
1294 struct p9_req_t *req;
1295 int iounit;
1296
1297 p9_debug(P9_DEBUG_9P,
1298 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1299 ofid->fid, name, flags, mode,
1300 from_kgid(&init_user_ns, gid));
1301 clnt = ofid->clnt;
1302
1303 if (ofid->mode != -1)
1304 return -EINVAL;
1305
1306 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1307 mode, gid);
1308 if (IS_ERR(req)) {
1309 err = PTR_ERR(req);
1310 goto error;
1311 }
1312
1313 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit);
1314 if (err) {
1315 trace_9p_protocol_dump(clnt, &req->rc);
1316 goto free_and_error;
1317 }
1318
1319 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1320 qid->type,
1321 (unsigned long long)qid->path,
1322 qid->version, iounit);
1323
1324 memmove(&ofid->qid, qid, sizeof(struct p9_qid));
1325 ofid->mode = mode;
1326 ofid->iounit = iounit;
1327
1328 free_and_error:
1329 p9_tag_remove(clnt, req);
1330 error:
1331 return err;
1332 }
1333 EXPORT_SYMBOL(p9_client_create_dotl);
1334
p9_client_fcreate(struct p9_fid * fid,const char * name,u32 perm,int mode,char * extension)1335 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode,
1336 char *extension)
1337 {
1338 int err;
1339 struct p9_client *clnt;
1340 struct p9_req_t *req;
1341 struct p9_qid qid;
1342 int iounit;
1343
1344 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1345 fid->fid, name, perm, mode);
1346 err = 0;
1347 clnt = fid->clnt;
1348
1349 if (fid->mode != -1)
1350 return -EINVAL;
1351
1352 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1353 mode, extension);
1354 if (IS_ERR(req)) {
1355 err = PTR_ERR(req);
1356 goto error;
1357 }
1358
1359 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1360 if (err) {
1361 trace_9p_protocol_dump(clnt, &req->rc);
1362 goto free_and_error;
1363 }
1364
1365 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1366 qid.type,
1367 (unsigned long long)qid.path,
1368 qid.version, iounit);
1369
1370 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1371 fid->mode = mode;
1372 fid->iounit = iounit;
1373
1374 free_and_error:
1375 p9_tag_remove(clnt, req);
1376 error:
1377 return err;
1378 }
1379 EXPORT_SYMBOL(p9_client_fcreate);
1380
p9_client_symlink(struct p9_fid * dfid,const char * name,const char * symtgt,kgid_t gid,struct p9_qid * qid)1381 int p9_client_symlink(struct p9_fid *dfid, const char *name,
1382 const char *symtgt, kgid_t gid, struct p9_qid *qid)
1383 {
1384 int err = 0;
1385 struct p9_client *clnt;
1386 struct p9_req_t *req;
1387
1388 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1389 dfid->fid, name, symtgt);
1390 clnt = dfid->clnt;
1391
1392 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1393 gid);
1394 if (IS_ERR(req)) {
1395 err = PTR_ERR(req);
1396 goto error;
1397 }
1398
1399 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
1400 if (err) {
1401 trace_9p_protocol_dump(clnt, &req->rc);
1402 goto free_and_error;
1403 }
1404
1405 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1406 qid->type, (unsigned long long)qid->path, qid->version);
1407
1408 free_and_error:
1409 p9_tag_remove(clnt, req);
1410 error:
1411 return err;
1412 }
1413 EXPORT_SYMBOL(p9_client_symlink);
1414
p9_client_link(struct p9_fid * dfid,struct p9_fid * oldfid,const char * newname)1415 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname)
1416 {
1417 struct p9_client *clnt;
1418 struct p9_req_t *req;
1419
1420 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1421 dfid->fid, oldfid->fid, newname);
1422 clnt = dfid->clnt;
1423 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1424 newname);
1425 if (IS_ERR(req))
1426 return PTR_ERR(req);
1427
1428 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1429 p9_tag_remove(clnt, req);
1430 return 0;
1431 }
1432 EXPORT_SYMBOL(p9_client_link);
1433
p9_client_fsync(struct p9_fid * fid,int datasync)1434 int p9_client_fsync(struct p9_fid *fid, int datasync)
1435 {
1436 int err;
1437 struct p9_client *clnt;
1438 struct p9_req_t *req;
1439
1440 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1441 fid->fid, datasync);
1442 err = 0;
1443 clnt = fid->clnt;
1444
1445 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1446 if (IS_ERR(req)) {
1447 err = PTR_ERR(req);
1448 goto error;
1449 }
1450
1451 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1452
1453 p9_tag_remove(clnt, req);
1454
1455 error:
1456 return err;
1457 }
1458 EXPORT_SYMBOL(p9_client_fsync);
1459
p9_client_clunk(struct p9_fid * fid)1460 int p9_client_clunk(struct p9_fid *fid)
1461 {
1462 int err;
1463 struct p9_client *clnt;
1464 struct p9_req_t *req;
1465 int retries = 0;
1466
1467 if (!fid || IS_ERR(fid)) {
1468 pr_warn("%s (%d): Trying to clunk with invalid fid\n",
1469 __func__, task_pid_nr(current));
1470 dump_stack();
1471 return 0;
1472 }
1473 if (!refcount_dec_and_test(&fid->count))
1474 return 0;
1475
1476 again:
1477 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1478 retries);
1479 err = 0;
1480 clnt = fid->clnt;
1481
1482 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1483 if (IS_ERR(req)) {
1484 err = PTR_ERR(req);
1485 goto error;
1486 }
1487
1488 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1489
1490 p9_tag_remove(clnt, req);
1491 error:
1492 /*
1493 * Fid is not valid even after a failed clunk
1494 * If interrupted, retry once then give up and
1495 * leak fid until umount.
1496 */
1497 if (err == -ERESTARTSYS) {
1498 if (retries++ == 0)
1499 goto again;
1500 } else
1501 p9_fid_destroy(fid);
1502 return err;
1503 }
1504 EXPORT_SYMBOL(p9_client_clunk);
1505
p9_client_remove(struct p9_fid * fid)1506 int p9_client_remove(struct p9_fid *fid)
1507 {
1508 int err;
1509 struct p9_client *clnt;
1510 struct p9_req_t *req;
1511
1512 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1513 err = 0;
1514 clnt = fid->clnt;
1515
1516 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1517 if (IS_ERR(req)) {
1518 err = PTR_ERR(req);
1519 goto error;
1520 }
1521
1522 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1523
1524 p9_tag_remove(clnt, req);
1525 error:
1526 if (err == -ERESTARTSYS)
1527 p9_client_clunk(fid);
1528 else
1529 p9_fid_destroy(fid);
1530 return err;
1531 }
1532 EXPORT_SYMBOL(p9_client_remove);
1533
p9_client_unlinkat(struct p9_fid * dfid,const char * name,int flags)1534 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1535 {
1536 int err = 0;
1537 struct p9_req_t *req;
1538 struct p9_client *clnt;
1539
1540 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1541 dfid->fid, name, flags);
1542
1543 clnt = dfid->clnt;
1544 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1545 if (IS_ERR(req)) {
1546 err = PTR_ERR(req);
1547 goto error;
1548 }
1549 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1550
1551 p9_tag_remove(clnt, req);
1552 error:
1553 return err;
1554 }
1555 EXPORT_SYMBOL(p9_client_unlinkat);
1556
1557 int
p9_client_read(struct p9_fid * fid,u64 offset,struct iov_iter * to,int * err)1558 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
1559 {
1560 int total = 0;
1561 *err = 0;
1562
1563 while (iov_iter_count(to)) {
1564 int count;
1565
1566 count = p9_client_read_once(fid, offset, to, err);
1567 if (!count || *err)
1568 break;
1569 offset += count;
1570 total += count;
1571 }
1572 return total;
1573 }
1574 EXPORT_SYMBOL(p9_client_read);
1575
1576 int
p9_client_read_once(struct p9_fid * fid,u64 offset,struct iov_iter * to,int * err)1577 p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to,
1578 int *err)
1579 {
1580 struct p9_client *clnt = fid->clnt;
1581 struct p9_req_t *req;
1582 int count = iov_iter_count(to);
1583 int rsize, non_zc = 0;
1584 char *dataptr;
1585
1586 *err = 0;
1587 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1588 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to));
1589
1590 rsize = fid->iounit;
1591 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ)
1592 rsize = clnt->msize - P9_IOHDRSZ;
1593
1594 if (count < rsize)
1595 rsize = count;
1596
1597 /* Don't bother zerocopy for small IO (< 1024) */
1598 if (clnt->trans_mod->zc_request && rsize > 1024) {
1599 /* response header len is 11
1600 * PDU Header(7) + IO Size (4)
1601 */
1602 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize,
1603 0, 11, "dqd", fid->fid,
1604 offset, rsize);
1605 } else {
1606 non_zc = 1;
1607 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1608 rsize);
1609 }
1610 if (IS_ERR(req)) {
1611 *err = PTR_ERR(req);
1612 return 0;
1613 }
1614
1615 *err = p9pdu_readf(&req->rc, clnt->proto_version,
1616 "D", &count, &dataptr);
1617 if (*err) {
1618 trace_9p_protocol_dump(clnt, &req->rc);
1619 p9_tag_remove(clnt, req);
1620 return 0;
1621 }
1622 if (rsize < count) {
1623 pr_err("bogus RREAD count (%d > %d)\n", count, rsize);
1624 count = rsize;
1625 }
1626
1627 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1628
1629 if (non_zc) {
1630 int n = copy_to_iter(dataptr, count, to);
1631
1632 if (n != count) {
1633 *err = -EFAULT;
1634 p9_tag_remove(clnt, req);
1635 return n;
1636 }
1637 } else {
1638 iov_iter_advance(to, count);
1639 }
1640 p9_tag_remove(clnt, req);
1641 return count;
1642 }
1643 EXPORT_SYMBOL(p9_client_read_once);
1644
1645 int
p9_client_write(struct p9_fid * fid,u64 offset,struct iov_iter * from,int * err)1646 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
1647 {
1648 struct p9_client *clnt = fid->clnt;
1649 struct p9_req_t *req;
1650 int total = 0;
1651 *err = 0;
1652
1653 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n",
1654 fid->fid, (unsigned long long) offset,
1655 iov_iter_count(from));
1656
1657 while (iov_iter_count(from)) {
1658 int count = iov_iter_count(from);
1659 int rsize = fid->iounit;
1660 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1661 rsize = clnt->msize - P9_IOHDRSZ;
1662
1663 if (count < rsize)
1664 rsize = count;
1665
1666 /* Don't bother zerocopy for small IO (< 1024) */
1667 if (clnt->trans_mod->zc_request && rsize > 1024) {
1668 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
1669 rsize, P9_ZC_HDR_SZ, "dqd",
1670 fid->fid, offset, rsize);
1671 } else {
1672 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
1673 offset, rsize, from);
1674 }
1675 if (IS_ERR(req)) {
1676 *err = PTR_ERR(req);
1677 break;
1678 }
1679
1680 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &count);
1681 if (*err) {
1682 trace_9p_protocol_dump(clnt, &req->rc);
1683 p9_tag_remove(clnt, req);
1684 break;
1685 }
1686 if (rsize < count) {
1687 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize);
1688 count = rsize;
1689 }
1690
1691 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1692
1693 p9_tag_remove(clnt, req);
1694 iov_iter_advance(from, count);
1695 total += count;
1696 offset += count;
1697 }
1698 return total;
1699 }
1700 EXPORT_SYMBOL(p9_client_write);
1701
p9_client_stat(struct p9_fid * fid)1702 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1703 {
1704 int err;
1705 struct p9_client *clnt;
1706 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1707 struct p9_req_t *req;
1708 u16 ignored;
1709
1710 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1711
1712 if (!ret)
1713 return ERR_PTR(-ENOMEM);
1714
1715 err = 0;
1716 clnt = fid->clnt;
1717
1718 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1719 if (IS_ERR(req)) {
1720 err = PTR_ERR(req);
1721 goto error;
1722 }
1723
1724 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret);
1725 if (err) {
1726 trace_9p_protocol_dump(clnt, &req->rc);
1727 p9_tag_remove(clnt, req);
1728 goto error;
1729 }
1730
1731 p9_debug(P9_DEBUG_9P,
1732 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1733 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1734 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1735 "<<< uid=%d gid=%d n_muid=%d\n",
1736 ret->size, ret->type, ret->dev, ret->qid.type,
1737 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1738 ret->atime, ret->mtime, (unsigned long long)ret->length,
1739 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1740 from_kuid(&init_user_ns, ret->n_uid),
1741 from_kgid(&init_user_ns, ret->n_gid),
1742 from_kuid(&init_user_ns, ret->n_muid));
1743
1744 p9_tag_remove(clnt, req);
1745 return ret;
1746
1747 error:
1748 kfree(ret);
1749 return ERR_PTR(err);
1750 }
1751 EXPORT_SYMBOL(p9_client_stat);
1752
p9_client_getattr_dotl(struct p9_fid * fid,u64 request_mask)1753 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1754 u64 request_mask)
1755 {
1756 int err;
1757 struct p9_client *clnt;
1758 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1759 GFP_KERNEL);
1760 struct p9_req_t *req;
1761
1762 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1763 fid->fid, request_mask);
1764
1765 if (!ret)
1766 return ERR_PTR(-ENOMEM);
1767
1768 err = 0;
1769 clnt = fid->clnt;
1770
1771 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1772 if (IS_ERR(req)) {
1773 err = PTR_ERR(req);
1774 goto error;
1775 }
1776
1777 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret);
1778 if (err) {
1779 trace_9p_protocol_dump(clnt, &req->rc);
1780 p9_tag_remove(clnt, req);
1781 goto error;
1782 }
1783
1784 p9_debug(P9_DEBUG_9P,
1785 "<<< RGETATTR st_result_mask=%lld\n"
1786 "<<< qid=%x.%llx.%x\n"
1787 "<<< st_mode=%8.8x st_nlink=%llu\n"
1788 "<<< st_uid=%d st_gid=%d\n"
1789 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1790 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1791 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1792 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1793 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1794 "<<< st_gen=%lld st_data_version=%lld\n",
1795 ret->st_result_mask, ret->qid.type, ret->qid.path,
1796 ret->qid.version, ret->st_mode, ret->st_nlink,
1797 from_kuid(&init_user_ns, ret->st_uid),
1798 from_kgid(&init_user_ns, ret->st_gid),
1799 ret->st_rdev, ret->st_size, ret->st_blksize,
1800 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1801 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1802 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1803 ret->st_gen, ret->st_data_version);
1804
1805 p9_tag_remove(clnt, req);
1806 return ret;
1807
1808 error:
1809 kfree(ret);
1810 return ERR_PTR(err);
1811 }
1812 EXPORT_SYMBOL(p9_client_getattr_dotl);
1813
p9_client_statsize(struct p9_wstat * wst,int proto_version)1814 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1815 {
1816 int ret;
1817
1818 /* NOTE: size shouldn't include its own length */
1819 /* size[2] type[2] dev[4] qid[13] */
1820 /* mode[4] atime[4] mtime[4] length[8]*/
1821 /* name[s] uid[s] gid[s] muid[s] */
1822 ret = 2+4+13+4+4+4+8+2+2+2+2;
1823
1824 if (wst->name)
1825 ret += strlen(wst->name);
1826 if (wst->uid)
1827 ret += strlen(wst->uid);
1828 if (wst->gid)
1829 ret += strlen(wst->gid);
1830 if (wst->muid)
1831 ret += strlen(wst->muid);
1832
1833 if ((proto_version == p9_proto_2000u) ||
1834 (proto_version == p9_proto_2000L)) {
1835 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1836 if (wst->extension)
1837 ret += strlen(wst->extension);
1838 }
1839
1840 return ret;
1841 }
1842
p9_client_wstat(struct p9_fid * fid,struct p9_wstat * wst)1843 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1844 {
1845 int err;
1846 struct p9_req_t *req;
1847 struct p9_client *clnt;
1848
1849 err = 0;
1850 clnt = fid->clnt;
1851 wst->size = p9_client_statsize(wst, clnt->proto_version);
1852 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1853 p9_debug(P9_DEBUG_9P,
1854 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1855 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1856 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1857 " uid=%d gid=%d n_muid=%d\n",
1858 wst->size, wst->type, wst->dev, wst->qid.type,
1859 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1860 wst->atime, wst->mtime, (unsigned long long)wst->length,
1861 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1862 from_kuid(&init_user_ns, wst->n_uid),
1863 from_kgid(&init_user_ns, wst->n_gid),
1864 from_kuid(&init_user_ns, wst->n_muid));
1865
1866 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1867 if (IS_ERR(req)) {
1868 err = PTR_ERR(req);
1869 goto error;
1870 }
1871
1872 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1873
1874 p9_tag_remove(clnt, req);
1875 error:
1876 return err;
1877 }
1878 EXPORT_SYMBOL(p9_client_wstat);
1879
p9_client_setattr(struct p9_fid * fid,struct p9_iattr_dotl * p9attr)1880 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1881 {
1882 int err;
1883 struct p9_req_t *req;
1884 struct p9_client *clnt;
1885
1886 err = 0;
1887 clnt = fid->clnt;
1888 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1889 p9_debug(P9_DEBUG_9P,
1890 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1891 " atime_sec=%lld atime_nsec=%lld\n"
1892 " mtime_sec=%lld mtime_nsec=%lld\n",
1893 p9attr->valid, p9attr->mode,
1894 from_kuid(&init_user_ns, p9attr->uid),
1895 from_kgid(&init_user_ns, p9attr->gid),
1896 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1897 p9attr->mtime_sec, p9attr->mtime_nsec);
1898
1899 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1900
1901 if (IS_ERR(req)) {
1902 err = PTR_ERR(req);
1903 goto error;
1904 }
1905 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1906 p9_tag_remove(clnt, req);
1907 error:
1908 return err;
1909 }
1910 EXPORT_SYMBOL(p9_client_setattr);
1911
p9_client_statfs(struct p9_fid * fid,struct p9_rstatfs * sb)1912 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1913 {
1914 int err;
1915 struct p9_req_t *req;
1916 struct p9_client *clnt;
1917
1918 err = 0;
1919 clnt = fid->clnt;
1920
1921 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1922
1923 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1924 if (IS_ERR(req)) {
1925 err = PTR_ERR(req);
1926 goto error;
1927 }
1928
1929 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1930 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1931 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1932 if (err) {
1933 trace_9p_protocol_dump(clnt, &req->rc);
1934 p9_tag_remove(clnt, req);
1935 goto error;
1936 }
1937
1938 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1939 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1940 "fsid %llu namelen %ld\n",
1941 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1942 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1943 sb->fsid, (long int)sb->namelen);
1944
1945 p9_tag_remove(clnt, req);
1946 error:
1947 return err;
1948 }
1949 EXPORT_SYMBOL(p9_client_statfs);
1950
p9_client_rename(struct p9_fid * fid,struct p9_fid * newdirfid,const char * name)1951 int p9_client_rename(struct p9_fid *fid,
1952 struct p9_fid *newdirfid, const char *name)
1953 {
1954 int err;
1955 struct p9_req_t *req;
1956 struct p9_client *clnt;
1957
1958 err = 0;
1959 clnt = fid->clnt;
1960
1961 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1962 fid->fid, newdirfid->fid, name);
1963
1964 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1965 newdirfid->fid, name);
1966 if (IS_ERR(req)) {
1967 err = PTR_ERR(req);
1968 goto error;
1969 }
1970
1971 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1972
1973 p9_tag_remove(clnt, req);
1974 error:
1975 return err;
1976 }
1977 EXPORT_SYMBOL(p9_client_rename);
1978
p9_client_renameat(struct p9_fid * olddirfid,const char * old_name,struct p9_fid * newdirfid,const char * new_name)1979 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1980 struct p9_fid *newdirfid, const char *new_name)
1981 {
1982 int err;
1983 struct p9_req_t *req;
1984 struct p9_client *clnt;
1985
1986 err = 0;
1987 clnt = olddirfid->clnt;
1988
1989 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1990 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1991 newdirfid->fid, new_name);
1992
1993 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1994 old_name, newdirfid->fid, new_name);
1995 if (IS_ERR(req)) {
1996 err = PTR_ERR(req);
1997 goto error;
1998 }
1999
2000 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
2001 newdirfid->fid, new_name);
2002
2003 p9_tag_remove(clnt, req);
2004 error:
2005 return err;
2006 }
2007 EXPORT_SYMBOL(p9_client_renameat);
2008
2009 /*
2010 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
2011 */
p9_client_xattrwalk(struct p9_fid * file_fid,const char * attr_name,u64 * attr_size)2012 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
2013 const char *attr_name, u64 *attr_size)
2014 {
2015 int err;
2016 struct p9_req_t *req;
2017 struct p9_client *clnt;
2018 struct p9_fid *attr_fid;
2019
2020 err = 0;
2021 clnt = file_fid->clnt;
2022 attr_fid = p9_fid_create(clnt);
2023 if (!attr_fid) {
2024 err = -ENOMEM;
2025 goto error;
2026 }
2027 p9_debug(P9_DEBUG_9P,
2028 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2029 file_fid->fid, attr_fid->fid, attr_name);
2030
2031 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2032 file_fid->fid, attr_fid->fid, attr_name);
2033 if (IS_ERR(req)) {
2034 err = PTR_ERR(req);
2035 goto error;
2036 }
2037 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size);
2038 if (err) {
2039 trace_9p_protocol_dump(clnt, &req->rc);
2040 p9_tag_remove(clnt, req);
2041 goto clunk_fid;
2042 }
2043 p9_tag_remove(clnt, req);
2044 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2045 attr_fid->fid, *attr_size);
2046 return attr_fid;
2047 clunk_fid:
2048 p9_client_clunk(attr_fid);
2049 attr_fid = NULL;
2050 error:
2051 if (attr_fid && (attr_fid != file_fid))
2052 p9_fid_destroy(attr_fid);
2053
2054 return ERR_PTR(err);
2055 }
2056 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2057
p9_client_xattrcreate(struct p9_fid * fid,const char * name,u64 attr_size,int flags)2058 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2059 u64 attr_size, int flags)
2060 {
2061 int err;
2062 struct p9_req_t *req;
2063 struct p9_client *clnt;
2064
2065 p9_debug(P9_DEBUG_9P,
2066 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2067 fid->fid, name, (long long)attr_size, flags);
2068 err = 0;
2069 clnt = fid->clnt;
2070 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2071 fid->fid, name, attr_size, flags);
2072 if (IS_ERR(req)) {
2073 err = PTR_ERR(req);
2074 goto error;
2075 }
2076 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2077 p9_tag_remove(clnt, req);
2078 error:
2079 return err;
2080 }
2081 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2082
p9_client_readdir(struct p9_fid * fid,char * data,u32 count,u64 offset)2083 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2084 {
2085 int err, rsize, non_zc = 0;
2086 struct p9_client *clnt;
2087 struct p9_req_t *req;
2088 char *dataptr;
2089 struct kvec kv = {.iov_base = data, .iov_len = count};
2090 struct iov_iter to;
2091
2092 iov_iter_kvec(&to, READ, &kv, 1, count);
2093
2094 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2095 fid->fid, (unsigned long long) offset, count);
2096
2097 err = 0;
2098 clnt = fid->clnt;
2099
2100 rsize = fid->iounit;
2101 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2102 rsize = clnt->msize - P9_READDIRHDRSZ;
2103
2104 if (count < rsize)
2105 rsize = count;
2106
2107 /* Don't bother zerocopy for small IO (< 1024) */
2108 if (clnt->trans_mod->zc_request && rsize > 1024) {
2109 /*
2110 * response header len is 11
2111 * PDU Header(7) + IO Size (4)
2112 */
2113 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0,
2114 11, "dqd", fid->fid, offset, rsize);
2115 } else {
2116 non_zc = 1;
2117 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2118 offset, rsize);
2119 }
2120 if (IS_ERR(req)) {
2121 err = PTR_ERR(req);
2122 goto error;
2123 }
2124
2125 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr);
2126 if (err) {
2127 trace_9p_protocol_dump(clnt, &req->rc);
2128 goto free_and_error;
2129 }
2130 if (rsize < count) {
2131 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize);
2132 count = rsize;
2133 }
2134
2135 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2136
2137 if (non_zc)
2138 memmove(data, dataptr, count);
2139
2140 p9_tag_remove(clnt, req);
2141 return count;
2142
2143 free_and_error:
2144 p9_tag_remove(clnt, req);
2145 error:
2146 return err;
2147 }
2148 EXPORT_SYMBOL(p9_client_readdir);
2149
p9_client_mknod_dotl(struct p9_fid * fid,const char * name,int mode,dev_t rdev,kgid_t gid,struct p9_qid * qid)2150 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode,
2151 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2152 {
2153 int err;
2154 struct p9_client *clnt;
2155 struct p9_req_t *req;
2156
2157 err = 0;
2158 clnt = fid->clnt;
2159 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2160 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2161 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2162 MAJOR(rdev), MINOR(rdev), gid);
2163 if (IS_ERR(req))
2164 return PTR_ERR(req);
2165
2166 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
2167 if (err) {
2168 trace_9p_protocol_dump(clnt, &req->rc);
2169 goto error;
2170 }
2171 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2172 (unsigned long long)qid->path, qid->version);
2173
2174 error:
2175 p9_tag_remove(clnt, req);
2176 return err;
2177
2178 }
2179 EXPORT_SYMBOL(p9_client_mknod_dotl);
2180
p9_client_mkdir_dotl(struct p9_fid * fid,const char * name,int mode,kgid_t gid,struct p9_qid * qid)2181 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode,
2182 kgid_t gid, struct p9_qid *qid)
2183 {
2184 int err;
2185 struct p9_client *clnt;
2186 struct p9_req_t *req;
2187
2188 err = 0;
2189 clnt = fid->clnt;
2190 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2191 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2192 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
2193 gid);
2194 if (IS_ERR(req))
2195 return PTR_ERR(req);
2196
2197 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
2198 if (err) {
2199 trace_9p_protocol_dump(clnt, &req->rc);
2200 goto error;
2201 }
2202 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2203 (unsigned long long)qid->path, qid->version);
2204
2205 error:
2206 p9_tag_remove(clnt, req);
2207 return err;
2208
2209 }
2210 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2211
p9_client_lock_dotl(struct p9_fid * fid,struct p9_flock * flock,u8 * status)2212 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2213 {
2214 int err;
2215 struct p9_client *clnt;
2216 struct p9_req_t *req;
2217
2218 err = 0;
2219 clnt = fid->clnt;
2220 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2221 "start %lld length %lld proc_id %d client_id %s\n",
2222 fid->fid, flock->type, flock->flags, flock->start,
2223 flock->length, flock->proc_id, flock->client_id);
2224
2225 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2226 flock->flags, flock->start, flock->length,
2227 flock->proc_id, flock->client_id);
2228
2229 if (IS_ERR(req))
2230 return PTR_ERR(req);
2231
2232 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status);
2233 if (err) {
2234 trace_9p_protocol_dump(clnt, &req->rc);
2235 goto error;
2236 }
2237 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2238 error:
2239 p9_tag_remove(clnt, req);
2240 return err;
2241
2242 }
2243 EXPORT_SYMBOL(p9_client_lock_dotl);
2244
p9_client_getlock_dotl(struct p9_fid * fid,struct p9_getlock * glock)2245 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2246 {
2247 int err;
2248 struct p9_client *clnt;
2249 struct p9_req_t *req;
2250
2251 err = 0;
2252 clnt = fid->clnt;
2253 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2254 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2255 glock->start, glock->length, glock->proc_id, glock->client_id);
2256
2257 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2258 glock->start, glock->length, glock->proc_id, glock->client_id);
2259
2260 if (IS_ERR(req))
2261 return PTR_ERR(req);
2262
2263 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type,
2264 &glock->start, &glock->length, &glock->proc_id,
2265 &glock->client_id);
2266 if (err) {
2267 trace_9p_protocol_dump(clnt, &req->rc);
2268 goto error;
2269 }
2270 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2271 "proc_id %d client_id %s\n", glock->type, glock->start,
2272 glock->length, glock->proc_id, glock->client_id);
2273 error:
2274 p9_tag_remove(clnt, req);
2275 return err;
2276 }
2277 EXPORT_SYMBOL(p9_client_getlock_dotl);
2278
p9_client_readlink(struct p9_fid * fid,char ** target)2279 int p9_client_readlink(struct p9_fid *fid, char **target)
2280 {
2281 int err;
2282 struct p9_client *clnt;
2283 struct p9_req_t *req;
2284
2285 err = 0;
2286 clnt = fid->clnt;
2287 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2288
2289 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2290 if (IS_ERR(req))
2291 return PTR_ERR(req);
2292
2293 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target);
2294 if (err) {
2295 trace_9p_protocol_dump(clnt, &req->rc);
2296 goto error;
2297 }
2298 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2299 error:
2300 p9_tag_remove(clnt, req);
2301 return err;
2302 }
2303 EXPORT_SYMBOL(p9_client_readlink);
2304
p9_client_init(void)2305 int __init p9_client_init(void)
2306 {
2307 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU);
2308 return p9_req_cache ? 0 : -ENOMEM;
2309 }
2310
p9_client_exit(void)2311 void __exit p9_client_exit(void)
2312 {
2313 kmem_cache_destroy(p9_req_cache);
2314 }
2315