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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
38enum {
39 Opt_msize,
40 Opt_trans,
41 Opt_legacy,
42 Opt_version,
43 Opt_err,
44};
45
46static 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
54inline int p9_is_proto_dotl(struct p9_client *clnt)
55{
56 return clnt->proto_version == p9_proto_2000L;
57}
58EXPORT_SYMBOL(p9_is_proto_dotl);
59
60inline int p9_is_proto_dotu(struct p9_client *clnt)
61{
62 return clnt->proto_version == p9_proto_2000u;
63}
64EXPORT_SYMBOL(p9_is_proto_dotu);
65
66int 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}
88EXPORT_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 */
94static 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 */
105static 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_opts - 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
132static 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
218free_and_return:
219 if (ret)
220 v9fs_put_trans(clnt->trans_mod);
221 kfree(tmp_options);
222 return ret;
223}
224
225static 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
241void 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}
254EXPORT_SYMBOL(p9_fcall_fini);
255
256static struct kmem_cache *p9_req_cache;
257
258/**
259 * p9_tag_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 */
267static struct p9_req_t *
268p9_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
316free:
317 p9_fcall_fini(&req->tc);
318 p9_fcall_fini(&req->rc);
319free_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 */
332struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
333{
334 struct p9_req_t *req;
335
336 rcu_read_lock();
337again:
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}
356EXPORT_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 */
365static 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
377static 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
385int p9_req_put(struct p9_req_t *r)
386{
387 return kref_put(&r->refcount, p9_req_free);
388}
389EXPORT_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 */
398static 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 * @status: request status, one of REQ_STATUS_*
418 *
419 */
420void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
421{
422 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag);
423
424 /*
425 * This barrier is needed to make sure any change made to req before
426 * the status change is visible to another thread
427 */
428 smp_wmb();
429 req->status = status;
430
431 wake_up(&req->wq);
432 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag);
433 p9_req_put(req);
434}
435EXPORT_SYMBOL(p9_client_cb);
436
437/**
438 * p9_parse_header - parse header arguments out of a packet
439 * @pdu: packet to parse
440 * @size: size of packet
441 * @type: type of request
442 * @tag: tag of packet
443 * @rewind: set if we need to rewind offset afterwards
444 */
445
446int
447p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
448 int rewind)
449{
450 int8_t r_type;
451 int16_t r_tag;
452 int32_t r_size;
453 int offset = pdu->offset;
454 int err;
455
456 pdu->offset = 0;
457
458 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
459 if (err)
460 goto rewind_and_exit;
461
462 if (type)
463 *type = r_type;
464 if (tag)
465 *tag = r_tag;
466 if (size)
467 *size = r_size;
468
469 if (pdu->size != r_size || r_size < 7) {
470 err = -EINVAL;
471 goto rewind_and_exit;
472 }
473
474 pdu->id = r_type;
475 pdu->tag = r_tag;
476
477 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
478 pdu->size, pdu->id, pdu->tag);
479
480rewind_and_exit:
481 if (rewind)
482 pdu->offset = offset;
483 return err;
484}
485EXPORT_SYMBOL(p9_parse_header);
486
487/**
488 * p9_check_errors - check 9p packet for error return and process it
489 * @c: current client instance
490 * @req: request to parse and check for error conditions
491 *
492 * returns error code if one is discovered, otherwise returns 0
493 *
494 * this will have to be more complicated if we have multiple
495 * error packet types
496 */
497
498static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
499{
500 int8_t type;
501 int err;
502 int ecode;
503
504 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0);
505 if (req->rc.size >= c->msize) {
506 p9_debug(P9_DEBUG_ERROR,
507 "requested packet size too big: %d\n",
508 req->rc.size);
509 return -EIO;
510 }
511 /*
512 * dump the response from server
513 * This should be after check errors which poplulate pdu_fcall.
514 */
515 trace_9p_protocol_dump(c, &req->rc);
516 if (err) {
517 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
518 return err;
519 }
520 if (type != P9_RERROR && type != P9_RLERROR)
521 return 0;
522
523 if (!p9_is_proto_dotl(c)) {
524 char *ename;
525 err = p9pdu_readf(&req->rc, c->proto_version, "s?d",
526 &ename, &ecode);
527 if (err)
528 goto out_err;
529
530 if (p9_is_proto_dotu(c) && ecode < 512)
531 err = -ecode;
532
533 if (!err) {
534 err = p9_errstr2errno(ename, strlen(ename));
535
536 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
537 -ecode, ename);
538 }
539 kfree(ename);
540 } else {
541 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode);
542 err = -ecode;
543
544 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
545 }
546
547 return err;
548
549out_err:
550 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
551
552 return err;
553}
554
555/**
556 * p9_check_zc_errors - check 9p packet for error return and process it
557 * @c: current client instance
558 * @req: request to parse and check for error conditions
559 * @uidata: external buffer containing error
560 * @in_hdrlen: Size of response protocol buffer.
561 *
562 * returns error code if one is discovered, otherwise returns 0
563 *
564 * this will have to be more complicated if we have multiple
565 * error packet types
566 */
567
568static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
569 struct iov_iter *uidata, int in_hdrlen)
570{
571 int err;
572 int ecode;
573 int8_t type;
574 char *ename = NULL;
575
576 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0);
577 /*
578 * dump the response from server
579 * This should be after parse_header which poplulate pdu_fcall.
580 */
581 trace_9p_protocol_dump(c, &req->rc);
582 if (err) {
583 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
584 return err;
585 }
586
587 if (type != P9_RERROR && type != P9_RLERROR)
588 return 0;
589
590 if (!p9_is_proto_dotl(c)) {
591 /* Error is reported in string format */
592 int len;
593 /* 7 = header size for RERROR; */
594 int inline_len = in_hdrlen - 7;
595
596 len = req->rc.size - req->rc.offset;
597 if (len > (P9_ZC_HDR_SZ - 7)) {
598 err = -EFAULT;
599 goto out_err;
600 }
601
602 ename = &req->rc.sdata[req->rc.offset];
603 if (len > inline_len) {
604 /* We have error in external buffer */
605 if (!copy_from_iter_full(ename + inline_len,
606 len - inline_len, uidata)) {
607 err = -EFAULT;
608 goto out_err;
609 }
610 }
611 ename = NULL;
612 err = p9pdu_readf(&req->rc, c->proto_version, "s?d",
613 &ename, &ecode);
614 if (err)
615 goto out_err;
616
617 if (p9_is_proto_dotu(c) && ecode < 512)
618 err = -ecode;
619
620 if (!err) {
621 err = p9_errstr2errno(ename, strlen(ename));
622
623 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
624 -ecode, ename);
625 }
626 kfree(ename);
627 } else {
628 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode);
629 err = -ecode;
630
631 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
632 }
633 return err;
634
635out_err:
636 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
637 return err;
638}
639
640static struct p9_req_t *
641p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
642
643/**
644 * p9_client_flush - flush (cancel) a request
645 * @c: client state
646 * @oldreq: request to cancel
647 *
648 * This sents a flush for a particular request and links
649 * the flush request to the original request. The current
650 * code only supports a single flush request although the protocol
651 * allows for multiple flush requests to be sent for a single request.
652 *
653 */
654
655static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
656{
657 struct p9_req_t *req;
658 int16_t oldtag;
659 int err;
660
661 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1);
662 if (err)
663 return err;
664
665 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
666
667 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
668 if (IS_ERR(req))
669 return PTR_ERR(req);
670
671 /*
672 * if we haven't received a response for oldreq,
673 * remove it from the list
674 */
675 if (oldreq->status == REQ_STATUS_SENT) {
676 if (c->trans_mod->cancelled)
677 c->trans_mod->cancelled(c, oldreq);
678 }
679
680 p9_tag_remove(c, req);
681 return 0;
682}
683
684static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
685 int8_t type, int req_size,
686 const char *fmt, va_list ap)
687{
688 int err;
689 struct p9_req_t *req;
690
691 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
692
693 /* we allow for any status other than disconnected */
694 if (c->status == Disconnected)
695 return ERR_PTR(-EIO);
696
697 /* if status is begin_disconnected we allow only clunk request */
698 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
699 return ERR_PTR(-EIO);
700
701 req = p9_tag_alloc(c, type, req_size);
702 if (IS_ERR(req))
703 return req;
704
705 /* marshall the data */
706 p9pdu_prepare(&req->tc, req->tc.tag, type);
707 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap);
708 if (err)
709 goto reterr;
710 p9pdu_finalize(c, &req->tc);
711 trace_9p_client_req(c, type, req->tc.tag);
712 return req;
713reterr:
714 p9_tag_remove(c, req);
715 /* We have to put also the 2nd reference as it won't be used */
716 p9_req_put(req);
717 return ERR_PTR(err);
718}
719
720/**
721 * p9_client_rpc - issue a request and wait for a response
722 * @c: client session
723 * @type: type of request
724 * @fmt: protocol format string (see protocol.c)
725 *
726 * Returns request structure (which client must free using p9_tag_remove)
727 */
728
729static struct p9_req_t *
730p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
731{
732 va_list ap;
733 int sigpending, err;
734 unsigned long flags;
735 struct p9_req_t *req;
736
737 va_start(ap, fmt);
738 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
739 va_end(ap);
740 if (IS_ERR(req))
741 return req;
742
743 if (signal_pending(current)) {
744 sigpending = 1;
745 clear_thread_flag(TIF_SIGPENDING);
746 } else
747 sigpending = 0;
748
749 err = c->trans_mod->request(c, req);
750 if (err < 0) {
751 /* write won't happen */
752 p9_req_put(req);
753 if (err != -ERESTARTSYS && err != -EFAULT)
754 c->status = Disconnected;
755 goto recalc_sigpending;
756 }
757again:
758 /* Wait for the response */
759 err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD);
760
761 /*
762 * Make sure our req is coherent with regard to updates in other
763 * threads - echoes to wmb() in the callback
764 */
765 smp_rmb();
766
767 if ((err == -ERESTARTSYS) && (c->status == Connected)
768 && (type == P9_TFLUSH)) {
769 sigpending = 1;
770 clear_thread_flag(TIF_SIGPENDING);
771 goto again;
772 }
773
774 if (req->status == REQ_STATUS_ERROR) {
775 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
776 err = req->t_err;
777 }
778 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
779 p9_debug(P9_DEBUG_MUX, "flushing\n");
780 sigpending = 1;
781 clear_thread_flag(TIF_SIGPENDING);
782
783 if (c->trans_mod->cancel(c, req))
784 p9_client_flush(c, req);
785
786 /* if we received the response anyway, don't signal error */
787 if (req->status == REQ_STATUS_RCVD)
788 err = 0;
789 }
790recalc_sigpending:
791 if (sigpending) {
792 spin_lock_irqsave(¤t->sighand->siglock, flags);
793 recalc_sigpending();
794 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
795 }
796 if (err < 0)
797 goto reterr;
798
799 err = p9_check_errors(c, req);
800 trace_9p_client_res(c, type, req->rc.tag, err);
801 if (!err)
802 return req;
803reterr:
804 p9_tag_remove(c, req);
805 return ERR_PTR(safe_errno(err));
806}
807
808/**
809 * p9_client_zc_rpc - issue a request and wait for a response
810 * @c: client session
811 * @type: type of request
812 * @uidata: destination for zero copy read
813 * @uodata: source for zero copy write
814 * @inlen: read buffer size
815 * @olen: write buffer size
816 * @in_hdrlen: reader header size, This is the size of response protocol data
817 * @fmt: protocol format string (see protocol.c)
818 *
819 * Returns request structure (which client must free using p9_tag_remove)
820 */
821static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
822 struct iov_iter *uidata,
823 struct iov_iter *uodata,
824 int inlen, int olen, int in_hdrlen,
825 const char *fmt, ...)
826{
827 va_list ap;
828 int sigpending, err;
829 unsigned long flags;
830 struct p9_req_t *req;
831
832 va_start(ap, fmt);
833 /*
834 * We allocate a inline protocol data of only 4k bytes.
835 * The actual content is passed in zero-copy fashion.
836 */
837 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
838 va_end(ap);
839 if (IS_ERR(req))
840 return req;
841
842 if (signal_pending(current)) {
843 sigpending = 1;
844 clear_thread_flag(TIF_SIGPENDING);
845 } else
846 sigpending = 0;
847
848 err = c->trans_mod->zc_request(c, req, uidata, uodata,
849 inlen, olen, in_hdrlen);
850 if (err < 0) {
851 if (err == -EIO)
852 c->status = Disconnected;
853 if (err != -ERESTARTSYS)
854 goto recalc_sigpending;
855 }
856 if (req->status == REQ_STATUS_ERROR) {
857 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
858 err = req->t_err;
859 }
860 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
861 p9_debug(P9_DEBUG_MUX, "flushing\n");
862 sigpending = 1;
863 clear_thread_flag(TIF_SIGPENDING);
864
865 if (c->trans_mod->cancel(c, req))
866 p9_client_flush(c, req);
867
868 /* if we received the response anyway, don't signal error */
869 if (req->status == REQ_STATUS_RCVD)
870 err = 0;
871 }
872recalc_sigpending:
873 if (sigpending) {
874 spin_lock_irqsave(¤t->sighand->siglock, flags);
875 recalc_sigpending();
876 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
877 }
878 if (err < 0)
879 goto reterr;
880
881 err = p9_check_zc_errors(c, req, uidata, in_hdrlen);
882 trace_9p_client_res(c, type, req->rc.tag, err);
883 if (!err)
884 return req;
885reterr:
886 p9_tag_remove(c, req);
887 return ERR_PTR(safe_errno(err));
888}
889
890static struct p9_fid *p9_fid_create(struct p9_client *clnt)
891{
892 int ret;
893 struct p9_fid *fid;
894
895 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
896 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
897 if (!fid)
898 return NULL;
899
900 memset(&fid->qid, 0, sizeof(struct p9_qid));
901 fid->mode = -1;
902 fid->uid = current_fsuid();
903 fid->clnt = clnt;
904 fid->rdir = NULL;
905 fid->fid = 0;
906 refcount_set(&fid->count, 1);
907
908 idr_preload(GFP_KERNEL);
909 spin_lock_irq(&clnt->lock);
910 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1,
911 GFP_NOWAIT);
912 spin_unlock_irq(&clnt->lock);
913 idr_preload_end();
914 if (!ret)
915 return fid;
916
917 kfree(fid);
918 return NULL;
919}
920
921static 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
935static 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
995error:
996 kfree(version);
997 p9_tag_remove(c, req);
998
999 return err;
1000}
1001
1002struct 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
1070close_trans:
1071 clnt->trans_mod->close(clnt);
1072put_trans:
1073 v9fs_put_trans(clnt->trans_mod);
1074free_client:
1075 kfree(clnt);
1076 return ERR_PTR(err);
1077}
1078EXPORT_SYMBOL(p9_client_create);
1079
1080void 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}
1102EXPORT_SYMBOL(p9_client_destroy);
1103
1104void p9_client_disconnect(struct p9_client *clnt)
1105{
1106 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1107 clnt->status = Disconnected;
1108}
1109EXPORT_SYMBOL(p9_client_disconnect);
1110
1111void p9_client_begin_disconnect(struct p9_client *clnt)
1112{
1113 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1114 clnt->status = BeginDisconnect;
1115}
1116EXPORT_SYMBOL(p9_client_begin_disconnect);
1117
1118struct 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
1158error:
1159 if (fid)
1160 p9_fid_destroy(fid);
1161 return ERR_PTR(err);
1162}
1163EXPORT_SYMBOL(p9_client_attach);
1164
1165struct 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 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1193 nwname, wnames);
1194 if (IS_ERR(req)) {
1195 err = PTR_ERR(req);
1196 goto error;
1197 }
1198
1199 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1200 if (err) {
1201 trace_9p_protocol_dump(clnt, &req->rc);
1202 p9_tag_remove(clnt, req);
1203 goto clunk_fid;
1204 }
1205 p9_tag_remove(clnt, req);
1206
1207 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1208
1209 if (nwqids != nwname) {
1210 err = -ENOENT;
1211 goto clunk_fid;
1212 }
1213
1214 for (count = 0; count < nwqids; count++)
1215 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1216 count, wqids[count].type,
1217 (unsigned long long)wqids[count].path,
1218 wqids[count].version);
1219
1220 if (nwname)
1221 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1222 else
1223 memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid));
1224
1225 kfree(wqids);
1226 return fid;
1227
1228clunk_fid:
1229 kfree(wqids);
1230 p9_client_clunk(fid);
1231 fid = NULL;
1232
1233error:
1234 if (fid && (fid != oldfid))
1235 p9_fid_destroy(fid);
1236
1237 return ERR_PTR(err);
1238}
1239EXPORT_SYMBOL(p9_client_walk);
1240
1241int p9_client_open(struct p9_fid *fid, int mode)
1242{
1243 int err;
1244 struct p9_client *clnt;
1245 struct p9_req_t *req;
1246 struct p9_qid qid;
1247 int iounit;
1248
1249 clnt = fid->clnt;
1250 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1251 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1252 err = 0;
1253
1254 if (fid->mode != -1)
1255 return -EINVAL;
1256
1257 if (p9_is_proto_dotl(clnt))
1258 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1259 else
1260 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1261 if (IS_ERR(req)) {
1262 err = PTR_ERR(req);
1263 goto error;
1264 }
1265
1266 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1267 if (err) {
1268 trace_9p_protocol_dump(clnt, &req->rc);
1269 goto free_and_error;
1270 }
1271
1272 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1273 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1274 (unsigned long long)qid.path, qid.version, iounit);
1275
1276 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1277 fid->mode = mode;
1278 fid->iounit = iounit;
1279
1280free_and_error:
1281 p9_tag_remove(clnt, req);
1282error:
1283 return err;
1284}
1285EXPORT_SYMBOL(p9_client_open);
1286
1287int 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 memmove(&ofid->qid, qid, sizeof(struct p9_qid));
1323 ofid->mode = mode;
1324 ofid->iounit = iounit;
1325
1326free_and_error:
1327 p9_tag_remove(clnt, req);
1328error:
1329 return err;
1330}
1331EXPORT_SYMBOL(p9_client_create_dotl);
1332
1333int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode,
1334 char *extension)
1335{
1336 int err;
1337 struct p9_client *clnt;
1338 struct p9_req_t *req;
1339 struct p9_qid qid;
1340 int iounit;
1341
1342 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1343 fid->fid, name, perm, mode);
1344 err = 0;
1345 clnt = fid->clnt;
1346
1347 if (fid->mode != -1)
1348 return -EINVAL;
1349
1350 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1351 mode, extension);
1352 if (IS_ERR(req)) {
1353 err = PTR_ERR(req);
1354 goto error;
1355 }
1356
1357 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1358 if (err) {
1359 trace_9p_protocol_dump(clnt, &req->rc);
1360 goto free_and_error;
1361 }
1362
1363 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1364 qid.type,
1365 (unsigned long long)qid.path,
1366 qid.version, iounit);
1367
1368 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1369 fid->mode = mode;
1370 fid->iounit = iounit;
1371
1372free_and_error:
1373 p9_tag_remove(clnt, req);
1374error:
1375 return err;
1376}
1377EXPORT_SYMBOL(p9_client_fcreate);
1378
1379int p9_client_symlink(struct p9_fid *dfid, const char *name,
1380 const char *symtgt, kgid_t gid, struct p9_qid *qid)
1381{
1382 int err = 0;
1383 struct p9_client *clnt;
1384 struct p9_req_t *req;
1385
1386 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1387 dfid->fid, name, symtgt);
1388 clnt = dfid->clnt;
1389
1390 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1391 gid);
1392 if (IS_ERR(req)) {
1393 err = PTR_ERR(req);
1394 goto error;
1395 }
1396
1397 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
1398 if (err) {
1399 trace_9p_protocol_dump(clnt, &req->rc);
1400 goto free_and_error;
1401 }
1402
1403 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1404 qid->type, (unsigned long long)qid->path, qid->version);
1405
1406free_and_error:
1407 p9_tag_remove(clnt, req);
1408error:
1409 return err;
1410}
1411EXPORT_SYMBOL(p9_client_symlink);
1412
1413int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname)
1414{
1415 struct p9_client *clnt;
1416 struct p9_req_t *req;
1417
1418 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1419 dfid->fid, oldfid->fid, newname);
1420 clnt = dfid->clnt;
1421 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1422 newname);
1423 if (IS_ERR(req))
1424 return PTR_ERR(req);
1425
1426 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1427 p9_tag_remove(clnt, req);
1428 return 0;
1429}
1430EXPORT_SYMBOL(p9_client_link);
1431
1432int p9_client_fsync(struct p9_fid *fid, int datasync)
1433{
1434 int err;
1435 struct p9_client *clnt;
1436 struct p9_req_t *req;
1437
1438 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1439 fid->fid, datasync);
1440 err = 0;
1441 clnt = fid->clnt;
1442
1443 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1444 if (IS_ERR(req)) {
1445 err = PTR_ERR(req);
1446 goto error;
1447 }
1448
1449 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1450
1451 p9_tag_remove(clnt, req);
1452
1453error:
1454 return err;
1455}
1456EXPORT_SYMBOL(p9_client_fsync);
1457
1458int p9_client_clunk(struct p9_fid *fid)
1459{
1460 int err;
1461 struct p9_client *clnt;
1462 struct p9_req_t *req;
1463 int retries = 0;
1464
1465 if (!fid || IS_ERR(fid)) {
1466 pr_warn("%s (%d): Trying to clunk with invalid fid\n",
1467 __func__, task_pid_nr(current));
1468 dump_stack();
1469 return 0;
1470 }
1471 if (!refcount_dec_and_test(&fid->count))
1472 return 0;
1473
1474again:
1475 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1476 retries);
1477 err = 0;
1478 clnt = fid->clnt;
1479
1480 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1481 if (IS_ERR(req)) {
1482 err = PTR_ERR(req);
1483 goto error;
1484 }
1485
1486 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1487
1488 p9_tag_remove(clnt, req);
1489error:
1490 /*
1491 * Fid is not valid even after a failed clunk
1492 * If interrupted, retry once then give up and
1493 * leak fid until umount.
1494 */
1495 if (err == -ERESTARTSYS) {
1496 if (retries++ == 0)
1497 goto again;
1498 } else
1499 p9_fid_destroy(fid);
1500 return err;
1501}
1502EXPORT_SYMBOL(p9_client_clunk);
1503
1504int p9_client_remove(struct p9_fid *fid)
1505{
1506 int err;
1507 struct p9_client *clnt;
1508 struct p9_req_t *req;
1509
1510 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1511 err = 0;
1512 clnt = fid->clnt;
1513
1514 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1515 if (IS_ERR(req)) {
1516 err = PTR_ERR(req);
1517 goto error;
1518 }
1519
1520 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1521
1522 p9_tag_remove(clnt, req);
1523error:
1524 if (err == -ERESTARTSYS)
1525 p9_client_clunk(fid);
1526 else
1527 p9_fid_destroy(fid);
1528 return err;
1529}
1530EXPORT_SYMBOL(p9_client_remove);
1531
1532int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1533{
1534 int err = 0;
1535 struct p9_req_t *req;
1536 struct p9_client *clnt;
1537
1538 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1539 dfid->fid, name, flags);
1540
1541 clnt = dfid->clnt;
1542 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1543 if (IS_ERR(req)) {
1544 err = PTR_ERR(req);
1545 goto error;
1546 }
1547 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1548
1549 p9_tag_remove(clnt, req);
1550error:
1551 return err;
1552}
1553EXPORT_SYMBOL(p9_client_unlinkat);
1554
1555int
1556p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
1557{
1558 int total = 0;
1559 *err = 0;
1560
1561 while (iov_iter_count(to)) {
1562 int count;
1563
1564 count = p9_client_read_once(fid, offset, to, err);
1565 if (!count || *err)
1566 break;
1567 offset += count;
1568 total += count;
1569 }
1570 return total;
1571}
1572EXPORT_SYMBOL(p9_client_read);
1573
1574int
1575p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to,
1576 int *err)
1577{
1578 struct p9_client *clnt = fid->clnt;
1579 struct p9_req_t *req;
1580 int count = iov_iter_count(to);
1581 int rsize, non_zc = 0;
1582 char *dataptr;
1583
1584 *err = 0;
1585 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1586 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to));
1587
1588 rsize = fid->iounit;
1589 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ)
1590 rsize = clnt->msize - P9_IOHDRSZ;
1591
1592 if (count < rsize)
1593 rsize = count;
1594
1595 /* Don't bother zerocopy for small IO (< 1024) */
1596 if (clnt->trans_mod->zc_request && rsize > 1024) {
1597 /* response header len is 11
1598 * PDU Header(7) + IO Size (4)
1599 */
1600 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize,
1601 0, 11, "dqd", fid->fid,
1602 offset, rsize);
1603 } else {
1604 non_zc = 1;
1605 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1606 rsize);
1607 }
1608 if (IS_ERR(req)) {
1609 *err = PTR_ERR(req);
1610 return 0;
1611 }
1612
1613 *err = p9pdu_readf(&req->rc, clnt->proto_version,
1614 "D", &count, &dataptr);
1615 if (*err) {
1616 trace_9p_protocol_dump(clnt, &req->rc);
1617 p9_tag_remove(clnt, req);
1618 return 0;
1619 }
1620 if (rsize < count) {
1621 pr_err("bogus RREAD count (%d > %d)\n", count, rsize);
1622 count = rsize;
1623 }
1624
1625 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1626
1627 if (non_zc) {
1628 int n = copy_to_iter(dataptr, count, to);
1629
1630 if (n != count) {
1631 *err = -EFAULT;
1632 p9_tag_remove(clnt, req);
1633 return n;
1634 }
1635 } else {
1636 iov_iter_advance(to, count);
1637 }
1638 p9_tag_remove(clnt, req);
1639 return count;
1640}
1641EXPORT_SYMBOL(p9_client_read_once);
1642
1643int
1644p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
1645{
1646 struct p9_client *clnt = fid->clnt;
1647 struct p9_req_t *req;
1648 int total = 0;
1649 *err = 0;
1650
1651 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n",
1652 fid->fid, (unsigned long long) offset,
1653 iov_iter_count(from));
1654
1655 while (iov_iter_count(from)) {
1656 int count = iov_iter_count(from);
1657 int rsize = fid->iounit;
1658 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1659 rsize = clnt->msize - P9_IOHDRSZ;
1660
1661 if (count < rsize)
1662 rsize = count;
1663
1664 /* Don't bother zerocopy for small IO (< 1024) */
1665 if (clnt->trans_mod->zc_request && rsize > 1024) {
1666 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
1667 rsize, P9_ZC_HDR_SZ, "dqd",
1668 fid->fid, offset, rsize);
1669 } else {
1670 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
1671 offset, rsize, from);
1672 }
1673 if (IS_ERR(req)) {
1674 *err = PTR_ERR(req);
1675 break;
1676 }
1677
1678 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &count);
1679 if (*err) {
1680 trace_9p_protocol_dump(clnt, &req->rc);
1681 p9_tag_remove(clnt, req);
1682 break;
1683 }
1684 if (rsize < count) {
1685 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize);
1686 count = rsize;
1687 }
1688
1689 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1690
1691 p9_tag_remove(clnt, req);
1692 iov_iter_advance(from, count);
1693 total += count;
1694 offset += count;
1695 }
1696 return total;
1697}
1698EXPORT_SYMBOL(p9_client_write);
1699
1700struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1701{
1702 int err;
1703 struct p9_client *clnt;
1704 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1705 struct p9_req_t *req;
1706 u16 ignored;
1707
1708 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1709
1710 if (!ret)
1711 return ERR_PTR(-ENOMEM);
1712
1713 err = 0;
1714 clnt = fid->clnt;
1715
1716 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1717 if (IS_ERR(req)) {
1718 err = PTR_ERR(req);
1719 goto error;
1720 }
1721
1722 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret);
1723 if (err) {
1724 trace_9p_protocol_dump(clnt, &req->rc);
1725 p9_tag_remove(clnt, req);
1726 goto error;
1727 }
1728
1729 p9_debug(P9_DEBUG_9P,
1730 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1731 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1732 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1733 "<<< uid=%d gid=%d n_muid=%d\n",
1734 ret->size, ret->type, ret->dev, ret->qid.type,
1735 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1736 ret->atime, ret->mtime, (unsigned long long)ret->length,
1737 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1738 from_kuid(&init_user_ns, ret->n_uid),
1739 from_kgid(&init_user_ns, ret->n_gid),
1740 from_kuid(&init_user_ns, ret->n_muid));
1741
1742 p9_tag_remove(clnt, req);
1743 return ret;
1744
1745error:
1746 kfree(ret);
1747 return ERR_PTR(err);
1748}
1749EXPORT_SYMBOL(p9_client_stat);
1750
1751struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1752 u64 request_mask)
1753{
1754 int err;
1755 struct p9_client *clnt;
1756 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1757 GFP_KERNEL);
1758 struct p9_req_t *req;
1759
1760 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1761 fid->fid, request_mask);
1762
1763 if (!ret)
1764 return ERR_PTR(-ENOMEM);
1765
1766 err = 0;
1767 clnt = fid->clnt;
1768
1769 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1770 if (IS_ERR(req)) {
1771 err = PTR_ERR(req);
1772 goto error;
1773 }
1774
1775 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret);
1776 if (err) {
1777 trace_9p_protocol_dump(clnt, &req->rc);
1778 p9_tag_remove(clnt, req);
1779 goto error;
1780 }
1781
1782 p9_debug(P9_DEBUG_9P,
1783 "<<< RGETATTR st_result_mask=%lld\n"
1784 "<<< qid=%x.%llx.%x\n"
1785 "<<< st_mode=%8.8x st_nlink=%llu\n"
1786 "<<< st_uid=%d st_gid=%d\n"
1787 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1788 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1789 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1790 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1791 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1792 "<<< st_gen=%lld st_data_version=%lld\n",
1793 ret->st_result_mask, ret->qid.type, ret->qid.path,
1794 ret->qid.version, ret->st_mode, ret->st_nlink,
1795 from_kuid(&init_user_ns, ret->st_uid),
1796 from_kgid(&init_user_ns, ret->st_gid),
1797 ret->st_rdev, ret->st_size, ret->st_blksize,
1798 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1799 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1800 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1801 ret->st_gen, ret->st_data_version);
1802
1803 p9_tag_remove(clnt, req);
1804 return ret;
1805
1806error:
1807 kfree(ret);
1808 return ERR_PTR(err);
1809}
1810EXPORT_SYMBOL(p9_client_getattr_dotl);
1811
1812static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1813{
1814 int ret;
1815
1816 /* NOTE: size shouldn't include its own length */
1817 /* size[2] type[2] dev[4] qid[13] */
1818 /* mode[4] atime[4] mtime[4] length[8]*/
1819 /* name[s] uid[s] gid[s] muid[s] */
1820 ret = 2+4+13+4+4+4+8+2+2+2+2;
1821
1822 if (wst->name)
1823 ret += strlen(wst->name);
1824 if (wst->uid)
1825 ret += strlen(wst->uid);
1826 if (wst->gid)
1827 ret += strlen(wst->gid);
1828 if (wst->muid)
1829 ret += strlen(wst->muid);
1830
1831 if ((proto_version == p9_proto_2000u) ||
1832 (proto_version == p9_proto_2000L)) {
1833 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1834 if (wst->extension)
1835 ret += strlen(wst->extension);
1836 }
1837
1838 return ret;
1839}
1840
1841int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1842{
1843 int err;
1844 struct p9_req_t *req;
1845 struct p9_client *clnt;
1846
1847 err = 0;
1848 clnt = fid->clnt;
1849 wst->size = p9_client_statsize(wst, clnt->proto_version);
1850 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1851 p9_debug(P9_DEBUG_9P,
1852 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1853 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1854 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1855 " uid=%d gid=%d n_muid=%d\n",
1856 wst->size, wst->type, wst->dev, wst->qid.type,
1857 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1858 wst->atime, wst->mtime, (unsigned long long)wst->length,
1859 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1860 from_kuid(&init_user_ns, wst->n_uid),
1861 from_kgid(&init_user_ns, wst->n_gid),
1862 from_kuid(&init_user_ns, wst->n_muid));
1863
1864 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1865 if (IS_ERR(req)) {
1866 err = PTR_ERR(req);
1867 goto error;
1868 }
1869
1870 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1871
1872 p9_tag_remove(clnt, req);
1873error:
1874 return err;
1875}
1876EXPORT_SYMBOL(p9_client_wstat);
1877
1878int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1879{
1880 int err;
1881 struct p9_req_t *req;
1882 struct p9_client *clnt;
1883
1884 err = 0;
1885 clnt = fid->clnt;
1886 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1887 p9_debug(P9_DEBUG_9P,
1888 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1889 " atime_sec=%lld atime_nsec=%lld\n"
1890 " mtime_sec=%lld mtime_nsec=%lld\n",
1891 p9attr->valid, p9attr->mode,
1892 from_kuid(&init_user_ns, p9attr->uid),
1893 from_kgid(&init_user_ns, p9attr->gid),
1894 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1895 p9attr->mtime_sec, p9attr->mtime_nsec);
1896
1897 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1898
1899 if (IS_ERR(req)) {
1900 err = PTR_ERR(req);
1901 goto error;
1902 }
1903 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1904 p9_tag_remove(clnt, req);
1905error:
1906 return err;
1907}
1908EXPORT_SYMBOL(p9_client_setattr);
1909
1910int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1911{
1912 int err;
1913 struct p9_req_t *req;
1914 struct p9_client *clnt;
1915
1916 err = 0;
1917 clnt = fid->clnt;
1918
1919 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1920
1921 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1922 if (IS_ERR(req)) {
1923 err = PTR_ERR(req);
1924 goto error;
1925 }
1926
1927 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1928 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1929 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1930 if (err) {
1931 trace_9p_protocol_dump(clnt, &req->rc);
1932 p9_tag_remove(clnt, req);
1933 goto error;
1934 }
1935
1936 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1937 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1938 "fsid %llu namelen %ld\n",
1939 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1940 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1941 sb->fsid, (long int)sb->namelen);
1942
1943 p9_tag_remove(clnt, req);
1944error:
1945 return err;
1946}
1947EXPORT_SYMBOL(p9_client_statfs);
1948
1949int p9_client_rename(struct p9_fid *fid,
1950 struct p9_fid *newdirfid, const char *name)
1951{
1952 int err;
1953 struct p9_req_t *req;
1954 struct p9_client *clnt;
1955
1956 err = 0;
1957 clnt = fid->clnt;
1958
1959 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1960 fid->fid, newdirfid->fid, name);
1961
1962 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1963 newdirfid->fid, name);
1964 if (IS_ERR(req)) {
1965 err = PTR_ERR(req);
1966 goto error;
1967 }
1968
1969 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1970
1971 p9_tag_remove(clnt, req);
1972error:
1973 return err;
1974}
1975EXPORT_SYMBOL(p9_client_rename);
1976
1977int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1978 struct p9_fid *newdirfid, const char *new_name)
1979{
1980 int err;
1981 struct p9_req_t *req;
1982 struct p9_client *clnt;
1983
1984 err = 0;
1985 clnt = olddirfid->clnt;
1986
1987 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1988 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1989 newdirfid->fid, new_name);
1990
1991 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1992 old_name, newdirfid->fid, new_name);
1993 if (IS_ERR(req)) {
1994 err = PTR_ERR(req);
1995 goto error;
1996 }
1997
1998 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1999 newdirfid->fid, new_name);
2000
2001 p9_tag_remove(clnt, req);
2002error:
2003 return err;
2004}
2005EXPORT_SYMBOL(p9_client_renameat);
2006
2007/*
2008 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
2009 */
2010struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
2011 const char *attr_name, u64 *attr_size)
2012{
2013 int err;
2014 struct p9_req_t *req;
2015 struct p9_client *clnt;
2016 struct p9_fid *attr_fid;
2017
2018 err = 0;
2019 clnt = file_fid->clnt;
2020 attr_fid = p9_fid_create(clnt);
2021 if (!attr_fid) {
2022 err = -ENOMEM;
2023 goto error;
2024 }
2025 p9_debug(P9_DEBUG_9P,
2026 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2027 file_fid->fid, attr_fid->fid, attr_name);
2028
2029 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2030 file_fid->fid, attr_fid->fid, attr_name);
2031 if (IS_ERR(req)) {
2032 err = PTR_ERR(req);
2033 goto error;
2034 }
2035 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size);
2036 if (err) {
2037 trace_9p_protocol_dump(clnt, &req->rc);
2038 p9_tag_remove(clnt, req);
2039 goto clunk_fid;
2040 }
2041 p9_tag_remove(clnt, req);
2042 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2043 attr_fid->fid, *attr_size);
2044 return attr_fid;
2045clunk_fid:
2046 p9_client_clunk(attr_fid);
2047 attr_fid = NULL;
2048error:
2049 if (attr_fid && (attr_fid != file_fid))
2050 p9_fid_destroy(attr_fid);
2051
2052 return ERR_PTR(err);
2053}
2054EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2055
2056int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2057 u64 attr_size, int flags)
2058{
2059 int err;
2060 struct p9_req_t *req;
2061 struct p9_client *clnt;
2062
2063 p9_debug(P9_DEBUG_9P,
2064 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2065 fid->fid, name, (long long)attr_size, flags);
2066 err = 0;
2067 clnt = fid->clnt;
2068 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2069 fid->fid, name, attr_size, flags);
2070 if (IS_ERR(req)) {
2071 err = PTR_ERR(req);
2072 goto error;
2073 }
2074 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2075 p9_tag_remove(clnt, req);
2076error:
2077 return err;
2078}
2079EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2080
2081int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2082{
2083 int err, rsize, non_zc = 0;
2084 struct p9_client *clnt;
2085 struct p9_req_t *req;
2086 char *dataptr;
2087 struct kvec kv = {.iov_base = data, .iov_len = count};
2088 struct iov_iter to;
2089
2090 iov_iter_kvec(&to, READ, &kv, 1, count);
2091
2092 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2093 fid->fid, (unsigned long long) offset, count);
2094
2095 err = 0;
2096 clnt = fid->clnt;
2097
2098 rsize = fid->iounit;
2099 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2100 rsize = clnt->msize - P9_READDIRHDRSZ;
2101
2102 if (count < rsize)
2103 rsize = count;
2104
2105 /* Don't bother zerocopy for small IO (< 1024) */
2106 if (clnt->trans_mod->zc_request && rsize > 1024) {
2107 /*
2108 * response header len is 11
2109 * PDU Header(7) + IO Size (4)
2110 */
2111 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0,
2112 11, "dqd", fid->fid, offset, rsize);
2113 } else {
2114 non_zc = 1;
2115 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2116 offset, rsize);
2117 }
2118 if (IS_ERR(req)) {
2119 err = PTR_ERR(req);
2120 goto error;
2121 }
2122
2123 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr);
2124 if (err) {
2125 trace_9p_protocol_dump(clnt, &req->rc);
2126 goto free_and_error;
2127 }
2128 if (rsize < count) {
2129 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize);
2130 count = rsize;
2131 }
2132
2133 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2134
2135 if (non_zc)
2136 memmove(data, dataptr, count);
2137
2138 p9_tag_remove(clnt, req);
2139 return count;
2140
2141free_and_error:
2142 p9_tag_remove(clnt, req);
2143error:
2144 return err;
2145}
2146EXPORT_SYMBOL(p9_client_readdir);
2147
2148int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode,
2149 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2150{
2151 int err;
2152 struct p9_client *clnt;
2153 struct p9_req_t *req;
2154
2155 err = 0;
2156 clnt = fid->clnt;
2157 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2158 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2159 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2160 MAJOR(rdev), MINOR(rdev), gid);
2161 if (IS_ERR(req))
2162 return PTR_ERR(req);
2163
2164 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
2165 if (err) {
2166 trace_9p_protocol_dump(clnt, &req->rc);
2167 goto error;
2168 }
2169 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2170 (unsigned long long)qid->path, qid->version);
2171
2172error:
2173 p9_tag_remove(clnt, req);
2174 return err;
2175
2176}
2177EXPORT_SYMBOL(p9_client_mknod_dotl);
2178
2179int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode,
2180 kgid_t gid, struct p9_qid *qid)
2181{
2182 int err;
2183 struct p9_client *clnt;
2184 struct p9_req_t *req;
2185
2186 err = 0;
2187 clnt = fid->clnt;
2188 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2189 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2190 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
2191 gid);
2192 if (IS_ERR(req))
2193 return PTR_ERR(req);
2194
2195 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
2196 if (err) {
2197 trace_9p_protocol_dump(clnt, &req->rc);
2198 goto error;
2199 }
2200 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2201 (unsigned long long)qid->path, qid->version);
2202
2203error:
2204 p9_tag_remove(clnt, req);
2205 return err;
2206
2207}
2208EXPORT_SYMBOL(p9_client_mkdir_dotl);
2209
2210int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2211{
2212 int err;
2213 struct p9_client *clnt;
2214 struct p9_req_t *req;
2215
2216 err = 0;
2217 clnt = fid->clnt;
2218 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2219 "start %lld length %lld proc_id %d client_id %s\n",
2220 fid->fid, flock->type, flock->flags, flock->start,
2221 flock->length, flock->proc_id, flock->client_id);
2222
2223 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2224 flock->flags, flock->start, flock->length,
2225 flock->proc_id, flock->client_id);
2226
2227 if (IS_ERR(req))
2228 return PTR_ERR(req);
2229
2230 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status);
2231 if (err) {
2232 trace_9p_protocol_dump(clnt, &req->rc);
2233 goto error;
2234 }
2235 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2236error:
2237 p9_tag_remove(clnt, req);
2238 return err;
2239
2240}
2241EXPORT_SYMBOL(p9_client_lock_dotl);
2242
2243int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2244{
2245 int err;
2246 struct p9_client *clnt;
2247 struct p9_req_t *req;
2248
2249 err = 0;
2250 clnt = fid->clnt;
2251 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2252 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2253 glock->start, glock->length, glock->proc_id, glock->client_id);
2254
2255 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2256 glock->start, glock->length, glock->proc_id, glock->client_id);
2257
2258 if (IS_ERR(req))
2259 return PTR_ERR(req);
2260
2261 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type,
2262 &glock->start, &glock->length, &glock->proc_id,
2263 &glock->client_id);
2264 if (err) {
2265 trace_9p_protocol_dump(clnt, &req->rc);
2266 goto error;
2267 }
2268 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2269 "proc_id %d client_id %s\n", glock->type, glock->start,
2270 glock->length, glock->proc_id, glock->client_id);
2271error:
2272 p9_tag_remove(clnt, req);
2273 return err;
2274}
2275EXPORT_SYMBOL(p9_client_getlock_dotl);
2276
2277int p9_client_readlink(struct p9_fid *fid, char **target)
2278{
2279 int err;
2280 struct p9_client *clnt;
2281 struct p9_req_t *req;
2282
2283 err = 0;
2284 clnt = fid->clnt;
2285 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2286
2287 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2288 if (IS_ERR(req))
2289 return PTR_ERR(req);
2290
2291 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target);
2292 if (err) {
2293 trace_9p_protocol_dump(clnt, &req->rc);
2294 goto error;
2295 }
2296 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2297error:
2298 p9_tag_remove(clnt, req);
2299 return err;
2300}
2301EXPORT_SYMBOL(p9_client_readlink);
2302
2303int __init p9_client_init(void)
2304{
2305 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU);
2306 return p9_req_cache ? 0 : -ENOMEM;
2307}
2308
2309void __exit p9_client_exit(void)
2310{
2311 kmem_cache_destroy(p9_req_cache);
2312}
1/*
2 * net/9p/clnt.c
3 *
4 * 9P Client
5 *
6 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
23 *
24 */
25
26#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
27
28#include <linux/module.h>
29#include <linux/errno.h>
30#include <linux/fs.h>
31#include <linux/poll.h>
32#include <linux/idr.h>
33#include <linux/mutex.h>
34#include <linux/slab.h>
35#include <linux/sched.h>
36#include <linux/uaccess.h>
37#include <net/9p/9p.h>
38#include <linux/parser.h>
39#include <net/9p/client.h>
40#include <net/9p/transport.h>
41#include "protocol.h"
42
43#define CREATE_TRACE_POINTS
44#include <trace/events/9p.h>
45
46/*
47 * Client Option Parsing (code inspired by NFS code)
48 * - a little lazy - parse all client options
49 */
50
51enum {
52 Opt_msize,
53 Opt_trans,
54 Opt_legacy,
55 Opt_version,
56 Opt_err,
57};
58
59static const match_table_t tokens = {
60 {Opt_msize, "msize=%u"},
61 {Opt_legacy, "noextend"},
62 {Opt_trans, "trans=%s"},
63 {Opt_version, "version=%s"},
64 {Opt_err, NULL},
65};
66
67inline int p9_is_proto_dotl(struct p9_client *clnt)
68{
69 return clnt->proto_version == p9_proto_2000L;
70}
71EXPORT_SYMBOL(p9_is_proto_dotl);
72
73inline int p9_is_proto_dotu(struct p9_client *clnt)
74{
75 return clnt->proto_version == p9_proto_2000u;
76}
77EXPORT_SYMBOL(p9_is_proto_dotu);
78
79/*
80 * Some error codes are taken directly from the server replies,
81 * make sure they are valid.
82 */
83static int safe_errno(int err)
84{
85 if ((err > 0) || (err < -MAX_ERRNO)) {
86 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err);
87 return -EPROTO;
88 }
89 return err;
90}
91
92
93/* Interpret mount option for protocol version */
94static int get_protocol_version(char *s)
95{
96 int version = -EINVAL;
97
98 if (!strcmp(s, "9p2000")) {
99 version = p9_proto_legacy;
100 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n");
101 } else if (!strcmp(s, "9p2000.u")) {
102 version = p9_proto_2000u;
103 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
104 } else if (!strcmp(s, "9p2000.L")) {
105 version = p9_proto_2000L;
106 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
107 } else
108 pr_info("Unknown protocol version %s\n", s);
109
110 return version;
111}
112
113/**
114 * parse_options - parse mount options into client structure
115 * @opts: options string passed from mount
116 * @clnt: existing v9fs client information
117 *
118 * Return 0 upon success, -ERRNO upon failure
119 */
120
121static int parse_opts(char *opts, struct p9_client *clnt)
122{
123 char *options, *tmp_options;
124 char *p;
125 substring_t args[MAX_OPT_ARGS];
126 int option;
127 char *s;
128 int ret = 0;
129
130 clnt->proto_version = p9_proto_2000L;
131 clnt->msize = 8192;
132
133 if (!opts)
134 return 0;
135
136 tmp_options = kstrdup(opts, GFP_KERNEL);
137 if (!tmp_options) {
138 p9_debug(P9_DEBUG_ERROR,
139 "failed to allocate copy of option string\n");
140 return -ENOMEM;
141 }
142 options = tmp_options;
143
144 while ((p = strsep(&options, ",")) != NULL) {
145 int token, r;
146 if (!*p)
147 continue;
148 token = match_token(p, tokens, args);
149 switch (token) {
150 case Opt_msize:
151 r = match_int(&args[0], &option);
152 if (r < 0) {
153 p9_debug(P9_DEBUG_ERROR,
154 "integer field, but no integer?\n");
155 ret = r;
156 continue;
157 }
158 clnt->msize = option;
159 break;
160 case Opt_trans:
161 s = match_strdup(&args[0]);
162 if (!s) {
163 ret = -ENOMEM;
164 p9_debug(P9_DEBUG_ERROR,
165 "problem allocating copy of trans arg\n");
166 goto free_and_return;
167 }
168 clnt->trans_mod = v9fs_get_trans_by_name(s);
169 if (clnt->trans_mod == NULL) {
170 pr_info("Could not find request transport: %s\n",
171 s);
172 ret = -EINVAL;
173 kfree(s);
174 goto free_and_return;
175 }
176 kfree(s);
177 break;
178 case Opt_legacy:
179 clnt->proto_version = p9_proto_legacy;
180 break;
181 case Opt_version:
182 s = match_strdup(&args[0]);
183 if (!s) {
184 ret = -ENOMEM;
185 p9_debug(P9_DEBUG_ERROR,
186 "problem allocating copy of version arg\n");
187 goto free_and_return;
188 }
189 ret = get_protocol_version(s);
190 if (ret == -EINVAL) {
191 kfree(s);
192 goto free_and_return;
193 }
194 kfree(s);
195 clnt->proto_version = ret;
196 break;
197 default:
198 continue;
199 }
200 }
201
202free_and_return:
203 kfree(tmp_options);
204 return ret;
205}
206
207static struct p9_fcall *p9_fcall_alloc(int alloc_msize)
208{
209 struct p9_fcall *fc;
210 fc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, GFP_NOFS);
211 if (!fc)
212 return NULL;
213 fc->capacity = alloc_msize;
214 fc->sdata = (char *) fc + sizeof(struct p9_fcall);
215 return fc;
216}
217
218/**
219 * p9_tag_alloc - lookup/allocate a request by tag
220 * @c: client session to lookup tag within
221 * @tag: numeric id for transaction
222 *
223 * this is a simple array lookup, but will grow the
224 * request_slots as necessary to accommodate transaction
225 * ids which did not previously have a slot.
226 *
227 * this code relies on the client spinlock to manage locks, its
228 * possible we should switch to something else, but I'd rather
229 * stick with something low-overhead for the common case.
230 *
231 */
232
233static struct p9_req_t *
234p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
235{
236 unsigned long flags;
237 int row, col;
238 struct p9_req_t *req;
239 int alloc_msize = min(c->msize, max_size);
240
241 /* This looks up the original request by tag so we know which
242 * buffer to read the data into */
243 tag++;
244
245 if (tag >= c->max_tag) {
246 spin_lock_irqsave(&c->lock, flags);
247 /* check again since original check was outside of lock */
248 while (tag >= c->max_tag) {
249 row = (tag / P9_ROW_MAXTAG);
250 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
251 sizeof(struct p9_req_t), GFP_ATOMIC);
252
253 if (!c->reqs[row]) {
254 pr_err("Couldn't grow tag array\n");
255 spin_unlock_irqrestore(&c->lock, flags);
256 return ERR_PTR(-ENOMEM);
257 }
258 for (col = 0; col < P9_ROW_MAXTAG; col++) {
259 c->reqs[row][col].status = REQ_STATUS_IDLE;
260 c->reqs[row][col].tc = NULL;
261 }
262 c->max_tag += P9_ROW_MAXTAG;
263 }
264 spin_unlock_irqrestore(&c->lock, flags);
265 }
266 row = tag / P9_ROW_MAXTAG;
267 col = tag % P9_ROW_MAXTAG;
268
269 req = &c->reqs[row][col];
270 if (!req->wq) {
271 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
272 if (!req->wq)
273 goto grow_failed;
274 init_waitqueue_head(req->wq);
275 }
276
277 if (!req->tc)
278 req->tc = p9_fcall_alloc(alloc_msize);
279 if (!req->rc)
280 req->rc = p9_fcall_alloc(alloc_msize);
281 if (!req->tc || !req->rc)
282 goto grow_failed;
283
284 p9pdu_reset(req->tc);
285 p9pdu_reset(req->rc);
286
287 req->tc->tag = tag-1;
288 req->status = REQ_STATUS_ALLOC;
289
290 return req;
291
292grow_failed:
293 pr_err("Couldn't grow tag array\n");
294 kfree(req->tc);
295 kfree(req->rc);
296 kfree(req->wq);
297 req->tc = req->rc = NULL;
298 req->wq = NULL;
299 return ERR_PTR(-ENOMEM);
300}
301
302/**
303 * p9_tag_lookup - lookup a request by tag
304 * @c: client session to lookup tag within
305 * @tag: numeric id for transaction
306 *
307 */
308
309struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
310{
311 int row, col;
312
313 /* This looks up the original request by tag so we know which
314 * buffer to read the data into */
315 tag++;
316
317 if(tag >= c->max_tag)
318 return NULL;
319
320 row = tag / P9_ROW_MAXTAG;
321 col = tag % P9_ROW_MAXTAG;
322
323 return &c->reqs[row][col];
324}
325EXPORT_SYMBOL(p9_tag_lookup);
326
327/**
328 * p9_tag_init - setup tags structure and contents
329 * @c: v9fs client struct
330 *
331 * This initializes the tags structure for each client instance.
332 *
333 */
334
335static int p9_tag_init(struct p9_client *c)
336{
337 int err = 0;
338
339 c->tagpool = p9_idpool_create();
340 if (IS_ERR(c->tagpool)) {
341 err = PTR_ERR(c->tagpool);
342 goto error;
343 }
344 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
345 if (err < 0) {
346 p9_idpool_destroy(c->tagpool);
347 goto error;
348 }
349 c->max_tag = 0;
350error:
351 return err;
352}
353
354/**
355 * p9_tag_cleanup - cleans up tags structure and reclaims resources
356 * @c: v9fs client struct
357 *
358 * This frees resources associated with the tags structure
359 *
360 */
361static void p9_tag_cleanup(struct p9_client *c)
362{
363 int row, col;
364
365 /* check to insure all requests are idle */
366 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
367 for (col = 0; col < P9_ROW_MAXTAG; col++) {
368 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
369 p9_debug(P9_DEBUG_MUX,
370 "Attempting to cleanup non-free tag %d,%d\n",
371 row, col);
372 /* TODO: delay execution of cleanup */
373 return;
374 }
375 }
376 }
377
378 if (c->tagpool) {
379 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
380 p9_idpool_destroy(c->tagpool);
381 }
382
383 /* free requests associated with tags */
384 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
385 for (col = 0; col < P9_ROW_MAXTAG; col++) {
386 kfree(c->reqs[row][col].wq);
387 kfree(c->reqs[row][col].tc);
388 kfree(c->reqs[row][col].rc);
389 }
390 kfree(c->reqs[row]);
391 }
392 c->max_tag = 0;
393}
394
395/**
396 * p9_free_req - free a request and clean-up as necessary
397 * c: client state
398 * r: request to release
399 *
400 */
401
402static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
403{
404 int tag = r->tc->tag;
405 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
406
407 r->status = REQ_STATUS_IDLE;
408 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
409 p9_idpool_put(tag, c->tagpool);
410}
411
412/**
413 * p9_client_cb - call back from transport to client
414 * c: client state
415 * req: request received
416 *
417 */
418void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
419{
420 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
421
422 /*
423 * This barrier is needed to make sure any change made to req before
424 * the other thread wakes up will indeed be seen by the waiting side.
425 */
426 smp_wmb();
427 req->status = status;
428
429 wake_up(req->wq);
430 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
431}
432EXPORT_SYMBOL(p9_client_cb);
433
434/**
435 * p9_parse_header - parse header arguments out of a packet
436 * @pdu: packet to parse
437 * @size: size of packet
438 * @type: type of request
439 * @tag: tag of packet
440 * @rewind: set if we need to rewind offset afterwards
441 */
442
443int
444p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
445 int rewind)
446{
447 int8_t r_type;
448 int16_t r_tag;
449 int32_t r_size;
450 int offset = pdu->offset;
451 int err;
452
453 pdu->offset = 0;
454 if (pdu->size == 0)
455 pdu->size = 7;
456
457 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
458 if (err)
459 goto rewind_and_exit;
460
461 pdu->size = r_size;
462 pdu->id = r_type;
463 pdu->tag = r_tag;
464
465 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
466 pdu->size, pdu->id, pdu->tag);
467
468 if (type)
469 *type = r_type;
470 if (tag)
471 *tag = r_tag;
472 if (size)
473 *size = r_size;
474
475
476rewind_and_exit:
477 if (rewind)
478 pdu->offset = offset;
479 return err;
480}
481EXPORT_SYMBOL(p9_parse_header);
482
483/**
484 * p9_check_errors - check 9p packet for error return and process it
485 * @c: current client instance
486 * @req: request to parse and check for error conditions
487 *
488 * returns error code if one is discovered, otherwise returns 0
489 *
490 * this will have to be more complicated if we have multiple
491 * error packet types
492 */
493
494static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
495{
496 int8_t type;
497 int err;
498 int ecode;
499
500 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
501 /*
502 * dump the response from server
503 * This should be after check errors which poplulate pdu_fcall.
504 */
505 trace_9p_protocol_dump(c, req->rc);
506 if (err) {
507 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
508 return err;
509 }
510 if (type != P9_RERROR && type != P9_RLERROR)
511 return 0;
512
513 if (!p9_is_proto_dotl(c)) {
514 char *ename;
515 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
516 &ename, &ecode);
517 if (err)
518 goto out_err;
519
520 if (p9_is_proto_dotu(c))
521 err = -ecode;
522
523 if (!err || !IS_ERR_VALUE(err)) {
524 err = p9_errstr2errno(ename, strlen(ename));
525
526 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
527 -ecode, ename);
528 }
529 kfree(ename);
530 } else {
531 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
532 err = -ecode;
533
534 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
535 }
536
537 return err;
538
539out_err:
540 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
541
542 return err;
543}
544
545/**
546 * p9_check_zc_errors - check 9p packet for error return and process it
547 * @c: current client instance
548 * @req: request to parse and check for error conditions
549 * @in_hdrlen: Size of response protocol buffer.
550 *
551 * returns error code if one is discovered, otherwise returns 0
552 *
553 * this will have to be more complicated if we have multiple
554 * error packet types
555 */
556
557static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
558 char *uidata, int in_hdrlen, int kern_buf)
559{
560 int err;
561 int ecode;
562 int8_t type;
563 char *ename = NULL;
564
565 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
566 /*
567 * dump the response from server
568 * This should be after parse_header which poplulate pdu_fcall.
569 */
570 trace_9p_protocol_dump(c, req->rc);
571 if (err) {
572 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
573 return err;
574 }
575
576 if (type != P9_RERROR && type != P9_RLERROR)
577 return 0;
578
579 if (!p9_is_proto_dotl(c)) {
580 /* Error is reported in string format */
581 int len;
582 /* 7 = header size for RERROR; */
583 int inline_len = in_hdrlen - 7;
584
585 len = req->rc->size - req->rc->offset;
586 if (len > (P9_ZC_HDR_SZ - 7)) {
587 err = -EFAULT;
588 goto out_err;
589 }
590
591 ename = &req->rc->sdata[req->rc->offset];
592 if (len > inline_len) {
593 /* We have error in external buffer */
594 if (kern_buf) {
595 memcpy(ename + inline_len, uidata,
596 len - inline_len);
597 } else {
598 err = copy_from_user(ename + inline_len,
599 uidata, len - inline_len);
600 if (err) {
601 err = -EFAULT;
602 goto out_err;
603 }
604 }
605 }
606 ename = NULL;
607 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
608 &ename, &ecode);
609 if (err)
610 goto out_err;
611
612 if (p9_is_proto_dotu(c))
613 err = -ecode;
614
615 if (!err || !IS_ERR_VALUE(err)) {
616 err = p9_errstr2errno(ename, strlen(ename));
617
618 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
619 -ecode, ename);
620 }
621 kfree(ename);
622 } else {
623 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
624 err = -ecode;
625
626 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
627 }
628 return err;
629
630out_err:
631 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
632 return err;
633}
634
635static struct p9_req_t *
636p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
637
638/**
639 * p9_client_flush - flush (cancel) a request
640 * @c: client state
641 * @oldreq: request to cancel
642 *
643 * This sents a flush for a particular request and links
644 * the flush request to the original request. The current
645 * code only supports a single flush request although the protocol
646 * allows for multiple flush requests to be sent for a single request.
647 *
648 */
649
650static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
651{
652 struct p9_req_t *req;
653 int16_t oldtag;
654 int err;
655
656 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
657 if (err)
658 return err;
659
660 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
661
662 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
663 if (IS_ERR(req))
664 return PTR_ERR(req);
665
666 /*
667 * if we haven't received a response for oldreq,
668 * remove it from the list
669 */
670 if (oldreq->status == REQ_STATUS_SENT)
671 if (c->trans_mod->cancelled)
672 c->trans_mod->cancelled(c, oldreq);
673
674 p9_free_req(c, req);
675 return 0;
676}
677
678static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
679 int8_t type, int req_size,
680 const char *fmt, va_list ap)
681{
682 int tag, err;
683 struct p9_req_t *req;
684
685 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
686
687 /* we allow for any status other than disconnected */
688 if (c->status == Disconnected)
689 return ERR_PTR(-EIO);
690
691 /* if status is begin_disconnected we allow only clunk request */
692 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
693 return ERR_PTR(-EIO);
694
695 tag = P9_NOTAG;
696 if (type != P9_TVERSION) {
697 tag = p9_idpool_get(c->tagpool);
698 if (tag < 0)
699 return ERR_PTR(-ENOMEM);
700 }
701
702 req = p9_tag_alloc(c, tag, req_size);
703 if (IS_ERR(req))
704 return req;
705
706 /* marshall the data */
707 p9pdu_prepare(req->tc, tag, type);
708 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
709 if (err)
710 goto reterr;
711 p9pdu_finalize(c, req->tc);
712 trace_9p_client_req(c, type, tag);
713 return req;
714reterr:
715 p9_free_req(c, req);
716 return ERR_PTR(err);
717}
718
719/**
720 * p9_client_rpc - issue a request and wait for a response
721 * @c: client session
722 * @type: type of request
723 * @fmt: protocol format string (see protocol.c)
724 *
725 * Returns request structure (which client must free using p9_free_req)
726 */
727
728static struct p9_req_t *
729p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
730{
731 va_list ap;
732 int sigpending, err;
733 unsigned long flags;
734 struct p9_req_t *req;
735
736 va_start(ap, fmt);
737 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
738 va_end(ap);
739 if (IS_ERR(req))
740 return req;
741
742 if (signal_pending(current)) {
743 sigpending = 1;
744 clear_thread_flag(TIF_SIGPENDING);
745 } else
746 sigpending = 0;
747
748 err = c->trans_mod->request(c, req);
749 if (err < 0) {
750 if (err != -ERESTARTSYS && err != -EFAULT)
751 c->status = Disconnected;
752 goto reterr;
753 }
754again:
755 /* Wait for the response */
756 err = wait_event_interruptible(*req->wq,
757 req->status >= REQ_STATUS_RCVD);
758
759 /*
760 * Make sure our req is coherent with regard to updates in other
761 * threads - echoes to wmb() in the callback
762 */
763 smp_rmb();
764
765 if ((err == -ERESTARTSYS) && (c->status == Connected)
766 && (type == P9_TFLUSH)) {
767 sigpending = 1;
768 clear_thread_flag(TIF_SIGPENDING);
769 goto again;
770 }
771
772 if (req->status == REQ_STATUS_ERROR) {
773 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
774 err = req->t_err;
775 }
776 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
777 p9_debug(P9_DEBUG_MUX, "flushing\n");
778 sigpending = 1;
779 clear_thread_flag(TIF_SIGPENDING);
780
781 if (c->trans_mod->cancel(c, req))
782 p9_client_flush(c, req);
783
784 /* if we received the response anyway, don't signal error */
785 if (req->status == REQ_STATUS_RCVD)
786 err = 0;
787 }
788 if (sigpending) {
789 spin_lock_irqsave(¤t->sighand->siglock, flags);
790 recalc_sigpending();
791 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
792 }
793 if (err < 0)
794 goto reterr;
795
796 err = p9_check_errors(c, req);
797 trace_9p_client_res(c, type, req->rc->tag, err);
798 if (!err)
799 return req;
800reterr:
801 p9_free_req(c, req);
802 return ERR_PTR(safe_errno(err));
803}
804
805/**
806 * p9_client_zc_rpc - issue a request and wait for a response
807 * @c: client session
808 * @type: type of request
809 * @uidata: user bffer that should be ued for zero copy read
810 * @uodata: user buffer that shoud be user for zero copy write
811 * @inlen: read buffer size
812 * @olen: write buffer size
813 * @hdrlen: reader header size, This is the size of response protocol data
814 * @fmt: protocol format string (see protocol.c)
815 *
816 * Returns request structure (which client must free using p9_free_req)
817 */
818static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
819 char *uidata, char *uodata,
820 int inlen, int olen, int in_hdrlen,
821 int kern_buf, const char *fmt, ...)
822{
823 va_list ap;
824 int sigpending, err;
825 unsigned long flags;
826 struct p9_req_t *req;
827
828 va_start(ap, fmt);
829 /*
830 * We allocate a inline protocol data of only 4k bytes.
831 * The actual content is passed in zero-copy fashion.
832 */
833 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
834 va_end(ap);
835 if (IS_ERR(req))
836 return req;
837
838 if (signal_pending(current)) {
839 sigpending = 1;
840 clear_thread_flag(TIF_SIGPENDING);
841 } else
842 sigpending = 0;
843
844 /* If we are called with KERNEL_DS force kern_buf */
845 if (segment_eq(get_fs(), KERNEL_DS))
846 kern_buf = 1;
847
848 err = c->trans_mod->zc_request(c, req, uidata, uodata,
849 inlen, olen, in_hdrlen, kern_buf);
850 if (err < 0) {
851 if (err == -EIO)
852 c->status = Disconnected;
853 goto reterr;
854 }
855 if (req->status == REQ_STATUS_ERROR) {
856 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
857 err = req->t_err;
858 }
859 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
860 p9_debug(P9_DEBUG_MUX, "flushing\n");
861 sigpending = 1;
862 clear_thread_flag(TIF_SIGPENDING);
863
864 if (c->trans_mod->cancel(c, req))
865 p9_client_flush(c, req);
866
867 /* if we received the response anyway, don't signal error */
868 if (req->status == REQ_STATUS_RCVD)
869 err = 0;
870 }
871 if (sigpending) {
872 spin_lock_irqsave(¤t->sighand->siglock, flags);
873 recalc_sigpending();
874 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
875 }
876 if (err < 0)
877 goto reterr;
878
879 err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf);
880 trace_9p_client_res(c, type, req->rc->tag, err);
881 if (!err)
882 return req;
883reterr:
884 p9_free_req(c, req);
885 return ERR_PTR(safe_errno(err));
886}
887
888static struct p9_fid *p9_fid_create(struct p9_client *clnt)
889{
890 int ret;
891 struct p9_fid *fid;
892 unsigned long flags;
893
894 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
895 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
896 if (!fid)
897 return ERR_PTR(-ENOMEM);
898
899 ret = p9_idpool_get(clnt->fidpool);
900 if (ret < 0) {
901 ret = -ENOSPC;
902 goto error;
903 }
904 fid->fid = ret;
905
906 memset(&fid->qid, 0, sizeof(struct p9_qid));
907 fid->mode = -1;
908 fid->uid = current_fsuid();
909 fid->clnt = clnt;
910 fid->rdir = NULL;
911 spin_lock_irqsave(&clnt->lock, flags);
912 list_add(&fid->flist, &clnt->fidlist);
913 spin_unlock_irqrestore(&clnt->lock, flags);
914
915 return fid;
916
917error:
918 kfree(fid);
919 return ERR_PTR(ret);
920}
921
922static void p9_fid_destroy(struct p9_fid *fid)
923{
924 struct p9_client *clnt;
925 unsigned long flags;
926
927 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
928 clnt = fid->clnt;
929 p9_idpool_put(fid->fid, clnt->fidpool);
930 spin_lock_irqsave(&clnt->lock, flags);
931 list_del(&fid->flist);
932 spin_unlock_irqrestore(&clnt->lock, flags);
933 kfree(fid->rdir);
934 kfree(fid);
935}
936
937static int p9_client_version(struct p9_client *c)
938{
939 int err = 0;
940 struct p9_req_t *req;
941 char *version;
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 break;
963 }
964
965 if (IS_ERR(req))
966 return PTR_ERR(req);
967
968 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
969 if (err) {
970 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
971 trace_9p_protocol_dump(c, req->rc);
972 goto error;
973 }
974
975 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
976 if (!strncmp(version, "9P2000.L", 8))
977 c->proto_version = p9_proto_2000L;
978 else if (!strncmp(version, "9P2000.u", 8))
979 c->proto_version = p9_proto_2000u;
980 else if (!strncmp(version, "9P2000", 6))
981 c->proto_version = p9_proto_legacy;
982 else {
983 err = -EREMOTEIO;
984 goto error;
985 }
986
987 if (msize < c->msize)
988 c->msize = msize;
989
990error:
991 kfree(version);
992 p9_free_req(c, req);
993
994 return err;
995}
996
997struct p9_client *p9_client_create(const char *dev_name, char *options)
998{
999 int err;
1000 struct p9_client *clnt;
1001 char *client_id;
1002
1003 err = 0;
1004 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
1005 if (!clnt)
1006 return ERR_PTR(-ENOMEM);
1007
1008 clnt->trans_mod = NULL;
1009 clnt->trans = NULL;
1010
1011 client_id = utsname()->nodename;
1012 memcpy(clnt->name, client_id, strlen(client_id) + 1);
1013
1014 spin_lock_init(&clnt->lock);
1015 INIT_LIST_HEAD(&clnt->fidlist);
1016
1017 err = p9_tag_init(clnt);
1018 if (err < 0)
1019 goto free_client;
1020
1021 err = parse_opts(options, clnt);
1022 if (err < 0)
1023 goto destroy_tagpool;
1024
1025 if (!clnt->trans_mod)
1026 clnt->trans_mod = v9fs_get_default_trans();
1027
1028 if (clnt->trans_mod == NULL) {
1029 err = -EPROTONOSUPPORT;
1030 p9_debug(P9_DEBUG_ERROR,
1031 "No transport defined or default transport\n");
1032 goto destroy_tagpool;
1033 }
1034
1035 clnt->fidpool = p9_idpool_create();
1036 if (IS_ERR(clnt->fidpool)) {
1037 err = PTR_ERR(clnt->fidpool);
1038 goto put_trans;
1039 }
1040
1041 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1042 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1043
1044 err = clnt->trans_mod->create(clnt, dev_name, options);
1045 if (err)
1046 goto destroy_fidpool;
1047
1048 if (clnt->msize > clnt->trans_mod->maxsize)
1049 clnt->msize = clnt->trans_mod->maxsize;
1050
1051 err = p9_client_version(clnt);
1052 if (err)
1053 goto close_trans;
1054
1055 return clnt;
1056
1057close_trans:
1058 clnt->trans_mod->close(clnt);
1059destroy_fidpool:
1060 p9_idpool_destroy(clnt->fidpool);
1061put_trans:
1062 v9fs_put_trans(clnt->trans_mod);
1063destroy_tagpool:
1064 p9_idpool_destroy(clnt->tagpool);
1065free_client:
1066 kfree(clnt);
1067 return ERR_PTR(err);
1068}
1069EXPORT_SYMBOL(p9_client_create);
1070
1071void p9_client_destroy(struct p9_client *clnt)
1072{
1073 struct p9_fid *fid, *fidptr;
1074
1075 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1076
1077 if (clnt->trans_mod)
1078 clnt->trans_mod->close(clnt);
1079
1080 v9fs_put_trans(clnt->trans_mod);
1081
1082 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1083 pr_info("Found fid %d not clunked\n", fid->fid);
1084 p9_fid_destroy(fid);
1085 }
1086
1087 if (clnt->fidpool)
1088 p9_idpool_destroy(clnt->fidpool);
1089
1090 p9_tag_cleanup(clnt);
1091
1092 kfree(clnt);
1093}
1094EXPORT_SYMBOL(p9_client_destroy);
1095
1096void p9_client_disconnect(struct p9_client *clnt)
1097{
1098 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1099 clnt->status = Disconnected;
1100}
1101EXPORT_SYMBOL(p9_client_disconnect);
1102
1103void p9_client_begin_disconnect(struct p9_client *clnt)
1104{
1105 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1106 clnt->status = BeginDisconnect;
1107}
1108EXPORT_SYMBOL(p9_client_begin_disconnect);
1109
1110struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1111 char *uname, kuid_t n_uname, char *aname)
1112{
1113 int err = 0;
1114 struct p9_req_t *req;
1115 struct p9_fid *fid;
1116 struct p9_qid qid;
1117
1118
1119 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1120 afid ? afid->fid : -1, uname, aname);
1121 fid = p9_fid_create(clnt);
1122 if (IS_ERR(fid)) {
1123 err = PTR_ERR(fid);
1124 fid = NULL;
1125 goto error;
1126 }
1127
1128 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1129 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1130 if (IS_ERR(req)) {
1131 err = PTR_ERR(req);
1132 goto error;
1133 }
1134
1135 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1136 if (err) {
1137 trace_9p_protocol_dump(clnt, req->rc);
1138 p9_free_req(clnt, req);
1139 goto error;
1140 }
1141
1142 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1143 qid.type, (unsigned long long)qid.path, qid.version);
1144
1145 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1146
1147 p9_free_req(clnt, req);
1148 return fid;
1149
1150error:
1151 if (fid)
1152 p9_fid_destroy(fid);
1153 return ERR_PTR(err);
1154}
1155EXPORT_SYMBOL(p9_client_attach);
1156
1157struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1158 char **wnames, int clone)
1159{
1160 int err;
1161 struct p9_client *clnt;
1162 struct p9_fid *fid;
1163 struct p9_qid *wqids;
1164 struct p9_req_t *req;
1165 uint16_t nwqids, count;
1166
1167 err = 0;
1168 wqids = NULL;
1169 clnt = oldfid->clnt;
1170 if (clone) {
1171 fid = p9_fid_create(clnt);
1172 if (IS_ERR(fid)) {
1173 err = PTR_ERR(fid);
1174 fid = NULL;
1175 goto error;
1176 }
1177
1178 fid->uid = oldfid->uid;
1179 } else
1180 fid = oldfid;
1181
1182
1183 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1184 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1185
1186 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1187 nwname, wnames);
1188 if (IS_ERR(req)) {
1189 err = PTR_ERR(req);
1190 goto error;
1191 }
1192
1193 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1194 if (err) {
1195 trace_9p_protocol_dump(clnt, req->rc);
1196 p9_free_req(clnt, req);
1197 goto clunk_fid;
1198 }
1199 p9_free_req(clnt, req);
1200
1201 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1202
1203 if (nwqids != nwname) {
1204 err = -ENOENT;
1205 goto clunk_fid;
1206 }
1207
1208 for (count = 0; count < nwqids; count++)
1209 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1210 count, wqids[count].type,
1211 (unsigned long long)wqids[count].path,
1212 wqids[count].version);
1213
1214 if (nwname)
1215 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1216 else
1217 fid->qid = oldfid->qid;
1218
1219 kfree(wqids);
1220 return fid;
1221
1222clunk_fid:
1223 kfree(wqids);
1224 p9_client_clunk(fid);
1225 fid = NULL;
1226
1227error:
1228 if (fid && (fid != oldfid))
1229 p9_fid_destroy(fid);
1230
1231 return ERR_PTR(err);
1232}
1233EXPORT_SYMBOL(p9_client_walk);
1234
1235int p9_client_open(struct p9_fid *fid, int mode)
1236{
1237 int err;
1238 struct p9_client *clnt;
1239 struct p9_req_t *req;
1240 struct p9_qid qid;
1241 int iounit;
1242
1243 clnt = fid->clnt;
1244 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1245 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1246 err = 0;
1247
1248 if (fid->mode != -1)
1249 return -EINVAL;
1250
1251 if (p9_is_proto_dotl(clnt))
1252 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1253 else
1254 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1255 if (IS_ERR(req)) {
1256 err = PTR_ERR(req);
1257 goto error;
1258 }
1259
1260 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1261 if (err) {
1262 trace_9p_protocol_dump(clnt, req->rc);
1263 goto free_and_error;
1264 }
1265
1266 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1267 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1268 (unsigned long long)qid.path, qid.version, iounit);
1269
1270 fid->mode = mode;
1271 fid->iounit = iounit;
1272
1273free_and_error:
1274 p9_free_req(clnt, req);
1275error:
1276 return err;
1277}
1278EXPORT_SYMBOL(p9_client_open);
1279
1280int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1281 kgid_t gid, struct p9_qid *qid)
1282{
1283 int err = 0;
1284 struct p9_client *clnt;
1285 struct p9_req_t *req;
1286 int iounit;
1287
1288 p9_debug(P9_DEBUG_9P,
1289 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1290 ofid->fid, name, flags, mode,
1291 from_kgid(&init_user_ns, gid));
1292 clnt = ofid->clnt;
1293
1294 if (ofid->mode != -1)
1295 return -EINVAL;
1296
1297 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1298 mode, gid);
1299 if (IS_ERR(req)) {
1300 err = PTR_ERR(req);
1301 goto error;
1302 }
1303
1304 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1305 if (err) {
1306 trace_9p_protocol_dump(clnt, req->rc);
1307 goto free_and_error;
1308 }
1309
1310 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1311 qid->type,
1312 (unsigned long long)qid->path,
1313 qid->version, iounit);
1314
1315 ofid->mode = mode;
1316 ofid->iounit = iounit;
1317
1318free_and_error:
1319 p9_free_req(clnt, req);
1320error:
1321 return err;
1322}
1323EXPORT_SYMBOL(p9_client_create_dotl);
1324
1325int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1326 char *extension)
1327{
1328 int err;
1329 struct p9_client *clnt;
1330 struct p9_req_t *req;
1331 struct p9_qid qid;
1332 int iounit;
1333
1334 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1335 fid->fid, name, perm, mode);
1336 err = 0;
1337 clnt = fid->clnt;
1338
1339 if (fid->mode != -1)
1340 return -EINVAL;
1341
1342 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1343 mode, extension);
1344 if (IS_ERR(req)) {
1345 err = PTR_ERR(req);
1346 goto error;
1347 }
1348
1349 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1350 if (err) {
1351 trace_9p_protocol_dump(clnt, req->rc);
1352 goto free_and_error;
1353 }
1354
1355 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1356 qid.type,
1357 (unsigned long long)qid.path,
1358 qid.version, iounit);
1359
1360 fid->mode = mode;
1361 fid->iounit = iounit;
1362
1363free_and_error:
1364 p9_free_req(clnt, req);
1365error:
1366 return err;
1367}
1368EXPORT_SYMBOL(p9_client_fcreate);
1369
1370int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, kgid_t gid,
1371 struct p9_qid *qid)
1372{
1373 int err = 0;
1374 struct p9_client *clnt;
1375 struct p9_req_t *req;
1376
1377 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1378 dfid->fid, name, symtgt);
1379 clnt = dfid->clnt;
1380
1381 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1382 gid);
1383 if (IS_ERR(req)) {
1384 err = PTR_ERR(req);
1385 goto error;
1386 }
1387
1388 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1389 if (err) {
1390 trace_9p_protocol_dump(clnt, req->rc);
1391 goto free_and_error;
1392 }
1393
1394 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1395 qid->type, (unsigned long long)qid->path, qid->version);
1396
1397free_and_error:
1398 p9_free_req(clnt, req);
1399error:
1400 return err;
1401}
1402EXPORT_SYMBOL(p9_client_symlink);
1403
1404int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1405{
1406 struct p9_client *clnt;
1407 struct p9_req_t *req;
1408
1409 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1410 dfid->fid, oldfid->fid, newname);
1411 clnt = dfid->clnt;
1412 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1413 newname);
1414 if (IS_ERR(req))
1415 return PTR_ERR(req);
1416
1417 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1418 p9_free_req(clnt, req);
1419 return 0;
1420}
1421EXPORT_SYMBOL(p9_client_link);
1422
1423int p9_client_fsync(struct p9_fid *fid, int datasync)
1424{
1425 int err;
1426 struct p9_client *clnt;
1427 struct p9_req_t *req;
1428
1429 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1430 fid->fid, datasync);
1431 err = 0;
1432 clnt = fid->clnt;
1433
1434 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1435 if (IS_ERR(req)) {
1436 err = PTR_ERR(req);
1437 goto error;
1438 }
1439
1440 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1441
1442 p9_free_req(clnt, req);
1443
1444error:
1445 return err;
1446}
1447EXPORT_SYMBOL(p9_client_fsync);
1448
1449int p9_client_clunk(struct p9_fid *fid)
1450{
1451 int err;
1452 struct p9_client *clnt;
1453 struct p9_req_t *req;
1454 int retries = 0;
1455
1456 if (!fid) {
1457 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1458 __func__, task_pid_nr(current));
1459 dump_stack();
1460 return 0;
1461 }
1462
1463again:
1464 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1465 retries);
1466 err = 0;
1467 clnt = fid->clnt;
1468
1469 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1470 if (IS_ERR(req)) {
1471 err = PTR_ERR(req);
1472 goto error;
1473 }
1474
1475 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1476
1477 p9_free_req(clnt, req);
1478error:
1479 /*
1480 * Fid is not valid even after a failed clunk
1481 * If interrupted, retry once then give up and
1482 * leak fid until umount.
1483 */
1484 if (err == -ERESTARTSYS) {
1485 if (retries++ == 0)
1486 goto again;
1487 } else
1488 p9_fid_destroy(fid);
1489 return err;
1490}
1491EXPORT_SYMBOL(p9_client_clunk);
1492
1493int p9_client_remove(struct p9_fid *fid)
1494{
1495 int err;
1496 struct p9_client *clnt;
1497 struct p9_req_t *req;
1498
1499 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1500 err = 0;
1501 clnt = fid->clnt;
1502
1503 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1504 if (IS_ERR(req)) {
1505 err = PTR_ERR(req);
1506 goto error;
1507 }
1508
1509 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1510
1511 p9_free_req(clnt, req);
1512error:
1513 if (err == -ERESTARTSYS)
1514 p9_client_clunk(fid);
1515 else
1516 p9_fid_destroy(fid);
1517 return err;
1518}
1519EXPORT_SYMBOL(p9_client_remove);
1520
1521int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1522{
1523 int err = 0;
1524 struct p9_req_t *req;
1525 struct p9_client *clnt;
1526
1527 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1528 dfid->fid, name, flags);
1529
1530 clnt = dfid->clnt;
1531 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1532 if (IS_ERR(req)) {
1533 err = PTR_ERR(req);
1534 goto error;
1535 }
1536 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1537
1538 p9_free_req(clnt, req);
1539error:
1540 return err;
1541}
1542EXPORT_SYMBOL(p9_client_unlinkat);
1543
1544int
1545p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1546 u32 count)
1547{
1548 char *dataptr;
1549 int kernel_buf = 0;
1550 struct p9_req_t *req;
1551 struct p9_client *clnt;
1552 int err, rsize, non_zc = 0;
1553
1554
1555 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1556 fid->fid, (unsigned long long) offset, count);
1557 err = 0;
1558 clnt = fid->clnt;
1559
1560 rsize = fid->iounit;
1561 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1562 rsize = clnt->msize - P9_IOHDRSZ;
1563
1564 if (count < rsize)
1565 rsize = count;
1566
1567 /* Don't bother zerocopy for small IO (< 1024) */
1568 if (clnt->trans_mod->zc_request && rsize > 1024) {
1569 char *indata;
1570 if (data) {
1571 kernel_buf = 1;
1572 indata = data;
1573 } else
1574 indata = (__force char *)udata;
1575 /*
1576 * response header len is 11
1577 * PDU Header(7) + IO Size (4)
1578 */
1579 req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0,
1580 11, kernel_buf, "dqd", fid->fid,
1581 offset, rsize);
1582 } else {
1583 non_zc = 1;
1584 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1585 rsize);
1586 }
1587 if (IS_ERR(req)) {
1588 err = PTR_ERR(req);
1589 goto error;
1590 }
1591
1592 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1593 if (err) {
1594 trace_9p_protocol_dump(clnt, req->rc);
1595 goto free_and_error;
1596 }
1597
1598 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1599
1600 if (non_zc) {
1601 if (data) {
1602 memmove(data, dataptr, count);
1603 } else {
1604 err = copy_to_user(udata, dataptr, count);
1605 if (err) {
1606 err = -EFAULT;
1607 goto free_and_error;
1608 }
1609 }
1610 }
1611 p9_free_req(clnt, req);
1612 return count;
1613
1614free_and_error:
1615 p9_free_req(clnt, req);
1616error:
1617 return err;
1618}
1619EXPORT_SYMBOL(p9_client_read);
1620
1621int
1622p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1623 u64 offset, u32 count)
1624{
1625 int err, rsize;
1626 int kernel_buf = 0;
1627 struct p9_client *clnt;
1628 struct p9_req_t *req;
1629
1630 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1631 fid->fid, (unsigned long long) offset, count);
1632 err = 0;
1633 clnt = fid->clnt;
1634
1635 rsize = fid->iounit;
1636 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1637 rsize = clnt->msize - P9_IOHDRSZ;
1638
1639 if (count < rsize)
1640 rsize = count;
1641
1642 /* Don't bother zerocopy for small IO (< 1024) */
1643 if (clnt->trans_mod->zc_request && rsize > 1024) {
1644 char *odata;
1645 if (data) {
1646 kernel_buf = 1;
1647 odata = data;
1648 } else
1649 odata = (char *)udata;
1650 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize,
1651 P9_ZC_HDR_SZ, kernel_buf, "dqd",
1652 fid->fid, offset, rsize);
1653 } else {
1654 if (data)
1655 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
1656 offset, rsize, data);
1657 else
1658 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
1659 offset, rsize, udata);
1660 }
1661 if (IS_ERR(req)) {
1662 err = PTR_ERR(req);
1663 goto error;
1664 }
1665
1666 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1667 if (err) {
1668 trace_9p_protocol_dump(clnt, req->rc);
1669 goto free_and_error;
1670 }
1671
1672 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1673
1674 p9_free_req(clnt, req);
1675 return count;
1676
1677free_and_error:
1678 p9_free_req(clnt, req);
1679error:
1680 return err;
1681}
1682EXPORT_SYMBOL(p9_client_write);
1683
1684struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1685{
1686 int err;
1687 struct p9_client *clnt;
1688 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1689 struct p9_req_t *req;
1690 u16 ignored;
1691
1692 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1693
1694 if (!ret)
1695 return ERR_PTR(-ENOMEM);
1696
1697 err = 0;
1698 clnt = fid->clnt;
1699
1700 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1701 if (IS_ERR(req)) {
1702 err = PTR_ERR(req);
1703 goto error;
1704 }
1705
1706 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1707 if (err) {
1708 trace_9p_protocol_dump(clnt, req->rc);
1709 p9_free_req(clnt, req);
1710 goto error;
1711 }
1712
1713 p9_debug(P9_DEBUG_9P,
1714 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1715 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1716 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1717 "<<< uid=%d gid=%d n_muid=%d\n",
1718 ret->size, ret->type, ret->dev, ret->qid.type,
1719 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1720 ret->atime, ret->mtime, (unsigned long long)ret->length,
1721 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1722 from_kuid(&init_user_ns, ret->n_uid),
1723 from_kgid(&init_user_ns, ret->n_gid),
1724 from_kuid(&init_user_ns, ret->n_muid));
1725
1726 p9_free_req(clnt, req);
1727 return ret;
1728
1729error:
1730 kfree(ret);
1731 return ERR_PTR(err);
1732}
1733EXPORT_SYMBOL(p9_client_stat);
1734
1735struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1736 u64 request_mask)
1737{
1738 int err;
1739 struct p9_client *clnt;
1740 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1741 GFP_KERNEL);
1742 struct p9_req_t *req;
1743
1744 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1745 fid->fid, request_mask);
1746
1747 if (!ret)
1748 return ERR_PTR(-ENOMEM);
1749
1750 err = 0;
1751 clnt = fid->clnt;
1752
1753 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1754 if (IS_ERR(req)) {
1755 err = PTR_ERR(req);
1756 goto error;
1757 }
1758
1759 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1760 if (err) {
1761 trace_9p_protocol_dump(clnt, req->rc);
1762 p9_free_req(clnt, req);
1763 goto error;
1764 }
1765
1766 p9_debug(P9_DEBUG_9P,
1767 "<<< RGETATTR st_result_mask=%lld\n"
1768 "<<< qid=%x.%llx.%x\n"
1769 "<<< st_mode=%8.8x st_nlink=%llu\n"
1770 "<<< st_uid=%d st_gid=%d\n"
1771 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1772 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1773 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1774 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1775 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1776 "<<< st_gen=%lld st_data_version=%lld",
1777 ret->st_result_mask, ret->qid.type, ret->qid.path,
1778 ret->qid.version, ret->st_mode, ret->st_nlink,
1779 from_kuid(&init_user_ns, ret->st_uid),
1780 from_kgid(&init_user_ns, ret->st_gid),
1781 ret->st_rdev, ret->st_size, ret->st_blksize,
1782 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1783 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1784 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1785 ret->st_gen, ret->st_data_version);
1786
1787 p9_free_req(clnt, req);
1788 return ret;
1789
1790error:
1791 kfree(ret);
1792 return ERR_PTR(err);
1793}
1794EXPORT_SYMBOL(p9_client_getattr_dotl);
1795
1796static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1797{
1798 int ret;
1799
1800 /* NOTE: size shouldn't include its own length */
1801 /* size[2] type[2] dev[4] qid[13] */
1802 /* mode[4] atime[4] mtime[4] length[8]*/
1803 /* name[s] uid[s] gid[s] muid[s] */
1804 ret = 2+4+13+4+4+4+8+2+2+2+2;
1805
1806 if (wst->name)
1807 ret += strlen(wst->name);
1808 if (wst->uid)
1809 ret += strlen(wst->uid);
1810 if (wst->gid)
1811 ret += strlen(wst->gid);
1812 if (wst->muid)
1813 ret += strlen(wst->muid);
1814
1815 if ((proto_version == p9_proto_2000u) ||
1816 (proto_version == p9_proto_2000L)) {
1817 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1818 if (wst->extension)
1819 ret += strlen(wst->extension);
1820 }
1821
1822 return ret;
1823}
1824
1825int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1826{
1827 int err;
1828 struct p9_req_t *req;
1829 struct p9_client *clnt;
1830
1831 err = 0;
1832 clnt = fid->clnt;
1833 wst->size = p9_client_statsize(wst, clnt->proto_version);
1834 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1835 p9_debug(P9_DEBUG_9P,
1836 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1837 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1838 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1839 " uid=%d gid=%d n_muid=%d\n",
1840 wst->size, wst->type, wst->dev, wst->qid.type,
1841 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1842 wst->atime, wst->mtime, (unsigned long long)wst->length,
1843 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1844 from_kuid(&init_user_ns, wst->n_uid),
1845 from_kgid(&init_user_ns, wst->n_gid),
1846 from_kuid(&init_user_ns, wst->n_muid));
1847
1848 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1849 if (IS_ERR(req)) {
1850 err = PTR_ERR(req);
1851 goto error;
1852 }
1853
1854 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1855
1856 p9_free_req(clnt, req);
1857error:
1858 return err;
1859}
1860EXPORT_SYMBOL(p9_client_wstat);
1861
1862int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1863{
1864 int err;
1865 struct p9_req_t *req;
1866 struct p9_client *clnt;
1867
1868 err = 0;
1869 clnt = fid->clnt;
1870 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1871 p9_debug(P9_DEBUG_9P,
1872 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1873 " atime_sec=%lld atime_nsec=%lld\n"
1874 " mtime_sec=%lld mtime_nsec=%lld\n",
1875 p9attr->valid, p9attr->mode,
1876 from_kuid(&init_user_ns, p9attr->uid),
1877 from_kgid(&init_user_ns, p9attr->gid),
1878 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1879 p9attr->mtime_sec, p9attr->mtime_nsec);
1880
1881 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1882
1883 if (IS_ERR(req)) {
1884 err = PTR_ERR(req);
1885 goto error;
1886 }
1887 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1888 p9_free_req(clnt, req);
1889error:
1890 return err;
1891}
1892EXPORT_SYMBOL(p9_client_setattr);
1893
1894int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1895{
1896 int err;
1897 struct p9_req_t *req;
1898 struct p9_client *clnt;
1899
1900 err = 0;
1901 clnt = fid->clnt;
1902
1903 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1904
1905 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1906 if (IS_ERR(req)) {
1907 err = PTR_ERR(req);
1908 goto error;
1909 }
1910
1911 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1912 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1913 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1914 if (err) {
1915 trace_9p_protocol_dump(clnt, req->rc);
1916 p9_free_req(clnt, req);
1917 goto error;
1918 }
1919
1920 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1921 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1922 "fsid %llu namelen %ld\n",
1923 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1924 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1925 sb->fsid, (long int)sb->namelen);
1926
1927 p9_free_req(clnt, req);
1928error:
1929 return err;
1930}
1931EXPORT_SYMBOL(p9_client_statfs);
1932
1933int p9_client_rename(struct p9_fid *fid,
1934 struct p9_fid *newdirfid, const char *name)
1935{
1936 int err;
1937 struct p9_req_t *req;
1938 struct p9_client *clnt;
1939
1940 err = 0;
1941 clnt = fid->clnt;
1942
1943 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1944 fid->fid, newdirfid->fid, name);
1945
1946 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1947 newdirfid->fid, name);
1948 if (IS_ERR(req)) {
1949 err = PTR_ERR(req);
1950 goto error;
1951 }
1952
1953 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1954
1955 p9_free_req(clnt, req);
1956error:
1957 return err;
1958}
1959EXPORT_SYMBOL(p9_client_rename);
1960
1961int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1962 struct p9_fid *newdirfid, const char *new_name)
1963{
1964 int err;
1965 struct p9_req_t *req;
1966 struct p9_client *clnt;
1967
1968 err = 0;
1969 clnt = olddirfid->clnt;
1970
1971 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1972 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1973 newdirfid->fid, new_name);
1974
1975 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1976 old_name, newdirfid->fid, new_name);
1977 if (IS_ERR(req)) {
1978 err = PTR_ERR(req);
1979 goto error;
1980 }
1981
1982 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1983 newdirfid->fid, new_name);
1984
1985 p9_free_req(clnt, req);
1986error:
1987 return err;
1988}
1989EXPORT_SYMBOL(p9_client_renameat);
1990
1991/*
1992 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1993 */
1994struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1995 const char *attr_name, u64 *attr_size)
1996{
1997 int err;
1998 struct p9_req_t *req;
1999 struct p9_client *clnt;
2000 struct p9_fid *attr_fid;
2001
2002 err = 0;
2003 clnt = file_fid->clnt;
2004 attr_fid = p9_fid_create(clnt);
2005 if (IS_ERR(attr_fid)) {
2006 err = PTR_ERR(attr_fid);
2007 attr_fid = NULL;
2008 goto error;
2009 }
2010 p9_debug(P9_DEBUG_9P,
2011 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2012 file_fid->fid, attr_fid->fid, attr_name);
2013
2014 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2015 file_fid->fid, attr_fid->fid, attr_name);
2016 if (IS_ERR(req)) {
2017 err = PTR_ERR(req);
2018 goto error;
2019 }
2020 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
2021 if (err) {
2022 trace_9p_protocol_dump(clnt, req->rc);
2023 p9_free_req(clnt, req);
2024 goto clunk_fid;
2025 }
2026 p9_free_req(clnt, req);
2027 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2028 attr_fid->fid, *attr_size);
2029 return attr_fid;
2030clunk_fid:
2031 p9_client_clunk(attr_fid);
2032 attr_fid = NULL;
2033error:
2034 if (attr_fid && (attr_fid != file_fid))
2035 p9_fid_destroy(attr_fid);
2036
2037 return ERR_PTR(err);
2038}
2039EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2040
2041int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2042 u64 attr_size, int flags)
2043{
2044 int err;
2045 struct p9_req_t *req;
2046 struct p9_client *clnt;
2047
2048 p9_debug(P9_DEBUG_9P,
2049 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2050 fid->fid, name, (long long)attr_size, flags);
2051 err = 0;
2052 clnt = fid->clnt;
2053 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2054 fid->fid, name, attr_size, flags);
2055 if (IS_ERR(req)) {
2056 err = PTR_ERR(req);
2057 goto error;
2058 }
2059 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2060 p9_free_req(clnt, req);
2061error:
2062 return err;
2063}
2064EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2065
2066int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2067{
2068 int err, rsize, non_zc = 0;
2069 struct p9_client *clnt;
2070 struct p9_req_t *req;
2071 char *dataptr;
2072
2073 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2074 fid->fid, (unsigned long long) offset, count);
2075
2076 err = 0;
2077 clnt = fid->clnt;
2078
2079 rsize = fid->iounit;
2080 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2081 rsize = clnt->msize - P9_READDIRHDRSZ;
2082
2083 if (count < rsize)
2084 rsize = count;
2085
2086 /* Don't bother zerocopy for small IO (< 1024) */
2087 if (clnt->trans_mod->zc_request && rsize > 1024) {
2088 /*
2089 * response header len is 11
2090 * PDU Header(7) + IO Size (4)
2091 */
2092 req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0,
2093 11, 1, "dqd", fid->fid, offset, rsize);
2094 } else {
2095 non_zc = 1;
2096 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2097 offset, rsize);
2098 }
2099 if (IS_ERR(req)) {
2100 err = PTR_ERR(req);
2101 goto error;
2102 }
2103
2104 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2105 if (err) {
2106 trace_9p_protocol_dump(clnt, req->rc);
2107 goto free_and_error;
2108 }
2109
2110 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2111
2112 if (non_zc)
2113 memmove(data, dataptr, count);
2114
2115 p9_free_req(clnt, req);
2116 return count;
2117
2118free_and_error:
2119 p9_free_req(clnt, req);
2120error:
2121 return err;
2122}
2123EXPORT_SYMBOL(p9_client_readdir);
2124
2125int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
2126 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2127{
2128 int err;
2129 struct p9_client *clnt;
2130 struct p9_req_t *req;
2131
2132 err = 0;
2133 clnt = fid->clnt;
2134 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2135 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2136 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2137 MAJOR(rdev), MINOR(rdev), gid);
2138 if (IS_ERR(req))
2139 return PTR_ERR(req);
2140
2141 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2142 if (err) {
2143 trace_9p_protocol_dump(clnt, req->rc);
2144 goto error;
2145 }
2146 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2147 (unsigned long long)qid->path, qid->version);
2148
2149error:
2150 p9_free_req(clnt, req);
2151 return err;
2152
2153}
2154EXPORT_SYMBOL(p9_client_mknod_dotl);
2155
2156int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
2157 kgid_t gid, struct p9_qid *qid)
2158{
2159 int err;
2160 struct p9_client *clnt;
2161 struct p9_req_t *req;
2162
2163 err = 0;
2164 clnt = fid->clnt;
2165 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2166 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2167 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
2168 gid);
2169 if (IS_ERR(req))
2170 return PTR_ERR(req);
2171
2172 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2173 if (err) {
2174 trace_9p_protocol_dump(clnt, req->rc);
2175 goto error;
2176 }
2177 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2178 (unsigned long long)qid->path, qid->version);
2179
2180error:
2181 p9_free_req(clnt, req);
2182 return err;
2183
2184}
2185EXPORT_SYMBOL(p9_client_mkdir_dotl);
2186
2187int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2188{
2189 int err;
2190 struct p9_client *clnt;
2191 struct p9_req_t *req;
2192
2193 err = 0;
2194 clnt = fid->clnt;
2195 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2196 "start %lld length %lld proc_id %d client_id %s\n",
2197 fid->fid, flock->type, flock->flags, flock->start,
2198 flock->length, flock->proc_id, flock->client_id);
2199
2200 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2201 flock->flags, flock->start, flock->length,
2202 flock->proc_id, flock->client_id);
2203
2204 if (IS_ERR(req))
2205 return PTR_ERR(req);
2206
2207 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2208 if (err) {
2209 trace_9p_protocol_dump(clnt, req->rc);
2210 goto error;
2211 }
2212 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2213error:
2214 p9_free_req(clnt, req);
2215 return err;
2216
2217}
2218EXPORT_SYMBOL(p9_client_lock_dotl);
2219
2220int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2221{
2222 int err;
2223 struct p9_client *clnt;
2224 struct p9_req_t *req;
2225
2226 err = 0;
2227 clnt = fid->clnt;
2228 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2229 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2230 glock->start, glock->length, glock->proc_id, glock->client_id);
2231
2232 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2233 glock->start, glock->length, glock->proc_id, glock->client_id);
2234
2235 if (IS_ERR(req))
2236 return PTR_ERR(req);
2237
2238 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2239 &glock->start, &glock->length, &glock->proc_id,
2240 &glock->client_id);
2241 if (err) {
2242 trace_9p_protocol_dump(clnt, req->rc);
2243 goto error;
2244 }
2245 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2246 "proc_id %d client_id %s\n", glock->type, glock->start,
2247 glock->length, glock->proc_id, glock->client_id);
2248error:
2249 p9_free_req(clnt, req);
2250 return err;
2251}
2252EXPORT_SYMBOL(p9_client_getlock_dotl);
2253
2254int p9_client_readlink(struct p9_fid *fid, char **target)
2255{
2256 int err;
2257 struct p9_client *clnt;
2258 struct p9_req_t *req;
2259
2260 err = 0;
2261 clnt = fid->clnt;
2262 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2263
2264 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2265 if (IS_ERR(req))
2266 return PTR_ERR(req);
2267
2268 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2269 if (err) {
2270 trace_9p_protocol_dump(clnt, req->rc);
2271 goto error;
2272 }
2273 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2274error:
2275 p9_free_req(clnt, req);
2276 return err;
2277}
2278EXPORT_SYMBOL(p9_client_readlink);