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