~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/net/9p/client.c

Version: ~ [ linux-5.5-rc1 ] ~ [ linux-5.4.2 ] ~ [ linux-5.3.15 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.88 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.158 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.206 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.206 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.78 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 
 51 enum {
 52         Opt_msize,
 53         Opt_trans,
 54         Opt_legacy,
 55         Opt_version,
 56         Opt_err,
 57 };
 58 
 59 static 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 
 67 inline int p9_is_proto_dotl(struct p9_client *clnt)
 68 {
 69         return clnt->proto_version == p9_proto_2000L;
 70 }
 71 EXPORT_SYMBOL(p9_is_proto_dotl);
 72 
 73 inline int p9_is_proto_dotu(struct p9_client *clnt)
 74 {
 75         return clnt->proto_version == p9_proto_2000u;
 76 }
 77 EXPORT_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  */
 83 static 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 */
 94 static 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 
121 static 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_2000u;
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 
202 free_and_return:
203         kfree(tmp_options);
204         return ret;
205 }
206 
207 /**
208  * p9_tag_alloc - lookup/allocate a request by tag
209  * @c: client session to lookup tag within
210  * @tag: numeric id for transaction
211  *
212  * this is a simple array lookup, but will grow the
213  * request_slots as necessary to accommodate transaction
214  * ids which did not previously have a slot.
215  *
216  * this code relies on the client spinlock to manage locks, its
217  * possible we should switch to something else, but I'd rather
218  * stick with something low-overhead for the common case.
219  *
220  */
221 
222 static struct p9_req_t *
223 p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
224 {
225         unsigned long flags;
226         int row, col;
227         struct p9_req_t *req;
228         int alloc_msize = min(c->msize, max_size);
229 
230         /* This looks up the original request by tag so we know which
231          * buffer to read the data into */
232         tag++;
233 
234         if (tag >= c->max_tag) {
235                 spin_lock_irqsave(&c->lock, flags);
236                 /* check again since original check was outside of lock */
237                 while (tag >= c->max_tag) {
238                         row = (tag / P9_ROW_MAXTAG);
239                         c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
240                                         sizeof(struct p9_req_t), GFP_ATOMIC);
241 
242                         if (!c->reqs[row]) {
243                                 pr_err("Couldn't grow tag array\n");
244                                 spin_unlock_irqrestore(&c->lock, flags);
245                                 return ERR_PTR(-ENOMEM);
246                         }
247                         for (col = 0; col < P9_ROW_MAXTAG; col++) {
248                                 c->reqs[row][col].status = REQ_STATUS_IDLE;
249                                 c->reqs[row][col].tc = NULL;
250                         }
251                         c->max_tag += P9_ROW_MAXTAG;
252                 }
253                 spin_unlock_irqrestore(&c->lock, flags);
254         }
255         row = tag / P9_ROW_MAXTAG;
256         col = tag % P9_ROW_MAXTAG;
257 
258         req = &c->reqs[row][col];
259         if (!req->tc) {
260                 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
261                 if (!req->wq) {
262                         pr_err("Couldn't grow tag array\n");
263                         return ERR_PTR(-ENOMEM);
264                 }
265                 init_waitqueue_head(req->wq);
266                 req->tc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
267                                   GFP_NOFS);
268                 req->rc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
269                                   GFP_NOFS);
270                 if ((!req->tc) || (!req->rc)) {
271                         pr_err("Couldn't grow tag array\n");
272                         kfree(req->tc);
273                         kfree(req->rc);
274                         kfree(req->wq);
275                         req->tc = req->rc = NULL;
276                         req->wq = NULL;
277                         return ERR_PTR(-ENOMEM);
278                 }
279                 req->tc->capacity = alloc_msize;
280                 req->rc->capacity = alloc_msize;
281                 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
282                 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
283         }
284 
285         p9pdu_reset(req->tc);
286         p9pdu_reset(req->rc);
287 
288         req->tc->tag = tag-1;
289         req->status = REQ_STATUS_ALLOC;
290 
291         return &c->reqs[row][col];
292 }
293 
294 /**
295  * p9_tag_lookup - lookup a request by tag
296  * @c: client session to lookup tag within
297  * @tag: numeric id for transaction
298  *
299  */
300 
301 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
302 {
303         int row, col;
304 
305         /* This looks up the original request by tag so we know which
306          * buffer to read the data into */
307         tag++;
308 
309         if(tag >= c->max_tag) 
310                 return NULL;
311 
312         row = tag / P9_ROW_MAXTAG;
313         col = tag % P9_ROW_MAXTAG;
314 
315         return &c->reqs[row][col];
316 }
317 EXPORT_SYMBOL(p9_tag_lookup);
318 
319 /**
320  * p9_tag_init - setup tags structure and contents
321  * @c:  v9fs client struct
322  *
323  * This initializes the tags structure for each client instance.
324  *
325  */
326 
327 static int p9_tag_init(struct p9_client *c)
328 {
329         int err = 0;
330 
331         c->tagpool = p9_idpool_create();
332         if (IS_ERR(c->tagpool)) {
333                 err = PTR_ERR(c->tagpool);
334                 goto error;
335         }
336         err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
337         if (err < 0) {
338                 p9_idpool_destroy(c->tagpool);
339                 goto error;
340         }
341         c->max_tag = 0;
342 error:
343         return err;
344 }
345 
346 /**
347  * p9_tag_cleanup - cleans up tags structure and reclaims resources
348  * @c:  v9fs client struct
349  *
350  * This frees resources associated with the tags structure
351  *
352  */
353 static void p9_tag_cleanup(struct p9_client *c)
354 {
355         int row, col;
356 
357         /* check to insure all requests are idle */
358         for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
359                 for (col = 0; col < P9_ROW_MAXTAG; col++) {
360                         if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
361                                 p9_debug(P9_DEBUG_MUX,
362                                          "Attempting to cleanup non-free tag %d,%d\n",
363                                          row, col);
364                                 /* TODO: delay execution of cleanup */
365                                 return;
366                         }
367                 }
368         }
369 
370         if (c->tagpool) {
371                 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
372                 p9_idpool_destroy(c->tagpool);
373         }
374 
375         /* free requests associated with tags */
376         for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
377                 for (col = 0; col < P9_ROW_MAXTAG; col++) {
378                         kfree(c->reqs[row][col].wq);
379                         kfree(c->reqs[row][col].tc);
380                         kfree(c->reqs[row][col].rc);
381                 }
382                 kfree(c->reqs[row]);
383         }
384         c->max_tag = 0;
385 }
386 
387 /**
388  * p9_free_req - free a request and clean-up as necessary
389  * c: client state
390  * r: request to release
391  *
392  */
393 
394 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
395 {
396         int tag = r->tc->tag;
397         p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
398 
399         r->status = REQ_STATUS_IDLE;
400         if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
401                 p9_idpool_put(tag, c->tagpool);
402 }
403 
404 /**
405  * p9_client_cb - call back from transport to client
406  * c: client state
407  * req: request received
408  *
409  */
410 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
411 {
412         p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
413         wake_up(req->wq);
414         p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
415 }
416 EXPORT_SYMBOL(p9_client_cb);
417 
418 /**
419  * p9_parse_header - parse header arguments out of a packet
420  * @pdu: packet to parse
421  * @size: size of packet
422  * @type: type of request
423  * @tag: tag of packet
424  * @rewind: set if we need to rewind offset afterwards
425  */
426 
427 int
428 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
429                                                                 int rewind)
430 {
431         int8_t r_type;
432         int16_t r_tag;
433         int32_t r_size;
434         int offset = pdu->offset;
435         int err;
436 
437         pdu->offset = 0;
438         if (pdu->size == 0)
439                 pdu->size = 7;
440 
441         err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
442         if (err)
443                 goto rewind_and_exit;
444 
445         pdu->size = r_size;
446         pdu->id = r_type;
447         pdu->tag = r_tag;
448 
449         p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
450                  pdu->size, pdu->id, pdu->tag);
451 
452         if (type)
453                 *type = r_type;
454         if (tag)
455                 *tag = r_tag;
456         if (size)
457                 *size = r_size;
458 
459 
460 rewind_and_exit:
461         if (rewind)
462                 pdu->offset = offset;
463         return err;
464 }
465 EXPORT_SYMBOL(p9_parse_header);
466 
467 /**
468  * p9_check_errors - check 9p packet for error return and process it
469  * @c: current client instance
470  * @req: request to parse and check for error conditions
471  *
472  * returns error code if one is discovered, otherwise returns 0
473  *
474  * this will have to be more complicated if we have multiple
475  * error packet types
476  */
477 
478 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
479 {
480         int8_t type;
481         int err;
482         int ecode;
483 
484         err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
485         /*
486          * dump the response from server
487          * This should be after check errors which poplulate pdu_fcall.
488          */
489         trace_9p_protocol_dump(c, req->rc);
490         if (err) {
491                 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
492                 return err;
493         }
494         if (type != P9_RERROR && type != P9_RLERROR)
495                 return 0;
496 
497         if (!p9_is_proto_dotl(c)) {
498                 char *ename;
499                 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
500                                   &ename, &ecode);
501                 if (err)
502                         goto out_err;
503 
504                 if (p9_is_proto_dotu(c))
505                         err = -ecode;
506 
507                 if (!err || !IS_ERR_VALUE(err)) {
508                         err = p9_errstr2errno(ename, strlen(ename));
509 
510                         p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
511                                  -ecode, ename);
512                 }
513                 kfree(ename);
514         } else {
515                 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
516                 err = -ecode;
517 
518                 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
519         }
520 
521         return err;
522 
523 out_err:
524         p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
525 
526         return err;
527 }
528 
529 /**
530  * p9_check_zc_errors - check 9p packet for error return and process it
531  * @c: current client instance
532  * @req: request to parse and check for error conditions
533  * @in_hdrlen: Size of response protocol buffer.
534  *
535  * returns error code if one is discovered, otherwise returns 0
536  *
537  * this will have to be more complicated if we have multiple
538  * error packet types
539  */
540 
541 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
542                               char *uidata, int in_hdrlen, int kern_buf)
543 {
544         int err;
545         int ecode;
546         int8_t type;
547         char *ename = NULL;
548 
549         err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
550         /*
551          * dump the response from server
552          * This should be after parse_header which poplulate pdu_fcall.
553          */
554         trace_9p_protocol_dump(c, req->rc);
555         if (err) {
556                 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
557                 return err;
558         }
559 
560         if (type != P9_RERROR && type != P9_RLERROR)
561                 return 0;
562 
563         if (!p9_is_proto_dotl(c)) {
564                 /* Error is reported in string format */
565                 uint16_t len;
566                 /* 7 = header size for RERROR, 2 is the size of string len; */
567                 int inline_len = in_hdrlen - (7 + 2);
568 
569                 /* Read the size of error string */
570                 err = p9pdu_readf(req->rc, c->proto_version, "w", &len);
571                 if (err)
572                         goto out_err;
573 
574                 ename = kmalloc(len + 1, GFP_NOFS);
575                 if (!ename) {
576                         err = -ENOMEM;
577                         goto out_err;
578                 }
579                 if (len <= inline_len) {
580                         /* We have error in protocol buffer itself */
581                         if (pdu_read(req->rc, ename, len)) {
582                                 err = -EFAULT;
583                                 goto out_free;
584 
585                         }
586                 } else {
587                         /*
588                          *  Part of the data is in user space buffer.
589                          */
590                         if (pdu_read(req->rc, ename, inline_len)) {
591                                 err = -EFAULT;
592                                 goto out_free;
593 
594                         }
595                         if (kern_buf) {
596                                 memcpy(ename + inline_len, uidata,
597                                        len - inline_len);
598                         } else {
599                                 err = copy_from_user(ename + inline_len,
600                                                      uidata, len - inline_len);
601                                 if (err) {
602                                         err = -EFAULT;
603                                         goto out_free;
604                                 }
605                         }
606                 }
607                 ename[len] = 0;
608                 if (p9_is_proto_dotu(c)) {
609                         /* For dotu we also have error code */
610                         err = p9pdu_readf(req->rc,
611                                           c->proto_version, "d", &ecode);
612                         if (err)
613                                 goto out_free;
614                         err = -ecode;
615                 }
616                 if (!err || !IS_ERR_VALUE(err)) {
617                         err = p9_errstr2errno(ename, strlen(ename));
618 
619                         p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
620                                  -ecode, ename);
621                 }
622                 kfree(ename);
623         } else {
624                 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
625                 err = -ecode;
626 
627                 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
628         }
629         return err;
630 
631 out_free:
632         kfree(ename);
633 out_err:
634         p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
635         return err;
636 }
637 
638 static struct p9_req_t *
639 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
640 
641 /**
642  * p9_client_flush - flush (cancel) a request
643  * @c: client state
644  * @oldreq: request to cancel
645  *
646  * This sents a flush for a particular request and links
647  * the flush request to the original request.  The current
648  * code only supports a single flush request although the protocol
649  * allows for multiple flush requests to be sent for a single request.
650  *
651  */
652 
653 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
654 {
655         struct p9_req_t *req;
656         int16_t oldtag;
657         int err;
658 
659         err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
660         if (err)
661                 return err;
662 
663         p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
664 
665         req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
666         if (IS_ERR(req))
667                 return PTR_ERR(req);
668 
669 
670         /* if we haven't received a response for oldreq,
671            remove it from the list. */
672         spin_lock(&c->lock);
673         if (oldreq->status == REQ_STATUS_FLSH)
674                 list_del(&oldreq->req_list);
675         spin_unlock(&c->lock);
676 
677         p9_free_req(c, req);
678         return 0;
679 }
680 
681 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
682                                               int8_t type, int req_size,
683                                               const char *fmt, va_list ap)
684 {
685         int tag, err;
686         struct p9_req_t *req;
687 
688         p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
689 
690         /* we allow for any status other than disconnected */
691         if (c->status == Disconnected)
692                 return ERR_PTR(-EIO);
693 
694         /* if status is begin_disconnected we allow only clunk request */
695         if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
696                 return ERR_PTR(-EIO);
697 
698         tag = P9_NOTAG;
699         if (type != P9_TVERSION) {
700                 tag = p9_idpool_get(c->tagpool);
701                 if (tag < 0)
702                         return ERR_PTR(-ENOMEM);
703         }
704 
705         req = p9_tag_alloc(c, tag, req_size);
706         if (IS_ERR(req))
707                 return req;
708 
709         /* marshall the data */
710         p9pdu_prepare(req->tc, tag, type);
711         err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
712         if (err)
713                 goto reterr;
714         p9pdu_finalize(c, req->tc);
715         trace_9p_client_req(c, type, tag);
716         return req;
717 reterr:
718         p9_free_req(c, req);
719         return ERR_PTR(err);
720 }
721 
722 /**
723  * p9_client_rpc - issue a request and wait for a response
724  * @c: client session
725  * @type: type of request
726  * @fmt: protocol format string (see protocol.c)
727  *
728  * Returns request structure (which client must free using p9_free_req)
729  */
730 
731 static struct p9_req_t *
732 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
733 {
734         va_list ap;
735         int sigpending, err;
736         unsigned long flags;
737         struct p9_req_t *req;
738 
739         va_start(ap, fmt);
740         req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
741         va_end(ap);
742         if (IS_ERR(req))
743                 return req;
744 
745         if (signal_pending(current)) {
746                 sigpending = 1;
747                 clear_thread_flag(TIF_SIGPENDING);
748         } else
749                 sigpending = 0;
750 
751         err = c->trans_mod->request(c, req);
752         if (err < 0) {
753                 if (err != -ERESTARTSYS && err != -EFAULT)
754                         c->status = Disconnected;
755                 goto reterr;
756         }
757 again:
758         /* Wait for the response */
759         err = wait_event_interruptible(*req->wq,
760                                        req->status >= REQ_STATUS_RCVD);
761 
762         if ((err == -ERESTARTSYS) && (c->status == Connected)
763                                   && (type == P9_TFLUSH)) {
764                 sigpending = 1;
765                 clear_thread_flag(TIF_SIGPENDING);
766                 goto again;
767         }
768 
769         if (req->status == REQ_STATUS_ERROR) {
770                 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
771                 err = req->t_err;
772         }
773         if ((err == -ERESTARTSYS) && (c->status == Connected)) {
774                 p9_debug(P9_DEBUG_MUX, "flushing\n");
775                 sigpending = 1;
776                 clear_thread_flag(TIF_SIGPENDING);
777 
778                 if (c->trans_mod->cancel(c, req))
779                         p9_client_flush(c, req);
780 
781                 /* if we received the response anyway, don't signal error */
782                 if (req->status == REQ_STATUS_RCVD)
783                         err = 0;
784         }
785         if (sigpending) {
786                 spin_lock_irqsave(&current->sighand->siglock, flags);
787                 recalc_sigpending();
788                 spin_unlock_irqrestore(&current->sighand->siglock, flags);
789         }
790         if (err < 0)
791                 goto reterr;
792 
793         err = p9_check_errors(c, req);
794         trace_9p_client_res(c, type, req->rc->tag, err);
795         if (!err)
796                 return req;
797 reterr:
798         p9_free_req(c, req);
799         return ERR_PTR(safe_errno(err));
800 }
801 
802 /**
803  * p9_client_zc_rpc - issue a request and wait for a response
804  * @c: client session
805  * @type: type of request
806  * @uidata: user bffer that should be ued for zero copy read
807  * @uodata: user buffer that shoud be user for zero copy write
808  * @inlen: read buffer size
809  * @olen: write buffer size
810  * @hdrlen: reader header size, This is the size of response protocol data
811  * @fmt: protocol format string (see protocol.c)
812  *
813  * Returns request structure (which client must free using p9_free_req)
814  */
815 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
816                                          char *uidata, char *uodata,
817                                          int inlen, int olen, int in_hdrlen,
818                                          int kern_buf, const char *fmt, ...)
819 {
820         va_list ap;
821         int sigpending, err;
822         unsigned long flags;
823         struct p9_req_t *req;
824 
825         va_start(ap, fmt);
826         /*
827          * We allocate a inline protocol data of only 4k bytes.
828          * The actual content is passed in zero-copy fashion.
829          */
830         req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
831         va_end(ap);
832         if (IS_ERR(req))
833                 return req;
834 
835         if (signal_pending(current)) {
836                 sigpending = 1;
837                 clear_thread_flag(TIF_SIGPENDING);
838         } else
839                 sigpending = 0;
840 
841         /* If we are called with KERNEL_DS force kern_buf */
842         if (segment_eq(get_fs(), KERNEL_DS))
843                 kern_buf = 1;
844 
845         err = c->trans_mod->zc_request(c, req, uidata, uodata,
846                                        inlen, olen, in_hdrlen, kern_buf);
847         if (err < 0) {
848                 if (err == -EIO)
849                         c->status = Disconnected;
850                 goto reterr;
851         }
852         if (req->status == REQ_STATUS_ERROR) {
853                 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
854                 err = req->t_err;
855         }
856         if ((err == -ERESTARTSYS) && (c->status == Connected)) {
857                 p9_debug(P9_DEBUG_MUX, "flushing\n");
858                 sigpending = 1;
859                 clear_thread_flag(TIF_SIGPENDING);
860 
861                 if (c->trans_mod->cancel(c, req))
862                         p9_client_flush(c, req);
863 
864                 /* if we received the response anyway, don't signal error */
865                 if (req->status == REQ_STATUS_RCVD)
866                         err = 0;
867         }
868         if (sigpending) {
869                 spin_lock_irqsave(&current->sighand->siglock, flags);
870                 recalc_sigpending();
871                 spin_unlock_irqrestore(&current->sighand->siglock, flags);
872         }
873         if (err < 0)
874                 goto reterr;
875 
876         err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf);
877         trace_9p_client_res(c, type, req->rc->tag, err);
878         if (!err)
879                 return req;
880 reterr:
881         p9_free_req(c, req);
882         return ERR_PTR(safe_errno(err));
883 }
884 
885 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
886 {
887         int ret;
888         struct p9_fid *fid;
889         unsigned long flags;
890 
891         p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
892         fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
893         if (!fid)
894                 return ERR_PTR(-ENOMEM);
895 
896         ret = p9_idpool_get(clnt->fidpool);
897         if (ret < 0) {
898                 ret = -ENOSPC;
899                 goto error;
900         }
901         fid->fid = ret;
902 
903         memset(&fid->qid, 0, sizeof(struct p9_qid));
904         fid->mode = -1;
905         fid->uid = current_fsuid();
906         fid->clnt = clnt;
907         fid->rdir = NULL;
908         spin_lock_irqsave(&clnt->lock, flags);
909         list_add(&fid->flist, &clnt->fidlist);
910         spin_unlock_irqrestore(&clnt->lock, flags);
911 
912         return fid;
913 
914 error:
915         kfree(fid);
916         return ERR_PTR(ret);
917 }
918 
919 static void p9_fid_destroy(struct p9_fid *fid)
920 {
921         struct p9_client *clnt;
922         unsigned long flags;
923 
924         p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
925         clnt = fid->clnt;
926         p9_idpool_put(fid->fid, clnt->fidpool);
927         spin_lock_irqsave(&clnt->lock, flags);
928         list_del(&fid->flist);
929         spin_unlock_irqrestore(&clnt->lock, flags);
930         kfree(fid->rdir);
931         kfree(fid);
932 }
933 
934 static int p9_client_version(struct p9_client *c)
935 {
936         int err = 0;
937         struct p9_req_t *req;
938         char *version;
939         int msize;
940 
941         p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
942                  c->msize, c->proto_version);
943 
944         switch (c->proto_version) {
945         case p9_proto_2000L:
946                 req = p9_client_rpc(c, P9_TVERSION, "ds",
947                                         c->msize, "9P2000.L");
948                 break;
949         case p9_proto_2000u:
950                 req = p9_client_rpc(c, P9_TVERSION, "ds",
951                                         c->msize, "9P2000.u");
952                 break;
953         case p9_proto_legacy:
954                 req = p9_client_rpc(c, P9_TVERSION, "ds",
955                                         c->msize, "9P2000");
956                 break;
957         default:
958                 return -EINVAL;
959                 break;
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                 err = -EREMOTEIO;
981                 goto error;
982         }
983 
984         if (msize < c->msize)
985                 c->msize = msize;
986 
987 error:
988         kfree(version);
989         p9_free_req(c, req);
990 
991         return err;
992 }
993 
994 struct p9_client *p9_client_create(const char *dev_name, char *options)
995 {
996         int err;
997         struct p9_client *clnt;
998 
999         err = 0;
1000         clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
1001         if (!clnt)
1002                 return ERR_PTR(-ENOMEM);
1003 
1004         clnt->trans_mod = NULL;
1005         clnt->trans = NULL;
1006         spin_lock_init(&clnt->lock);
1007         INIT_LIST_HEAD(&clnt->fidlist);
1008 
1009         err = p9_tag_init(clnt);
1010         if (err < 0)
1011                 goto free_client;
1012 
1013         err = parse_opts(options, clnt);
1014         if (err < 0)
1015                 goto destroy_tagpool;
1016 
1017         if (!clnt->trans_mod)
1018                 clnt->trans_mod = v9fs_get_default_trans();
1019 
1020         if (clnt->trans_mod == NULL) {
1021                 err = -EPROTONOSUPPORT;
1022                 p9_debug(P9_DEBUG_ERROR,
1023                          "No transport defined or default transport\n");
1024                 goto destroy_tagpool;
1025         }
1026 
1027         clnt->fidpool = p9_idpool_create();
1028         if (IS_ERR(clnt->fidpool)) {
1029                 err = PTR_ERR(clnt->fidpool);
1030                 goto put_trans;
1031         }
1032 
1033         p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1034                  clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1035 
1036         err = clnt->trans_mod->create(clnt, dev_name, options);
1037         if (err)
1038                 goto destroy_fidpool;
1039 
1040         if (clnt->msize > clnt->trans_mod->maxsize)
1041                 clnt->msize = clnt->trans_mod->maxsize;
1042 
1043         err = p9_client_version(clnt);
1044         if (err)
1045                 goto close_trans;
1046 
1047         return clnt;
1048 
1049 close_trans:
1050         clnt->trans_mod->close(clnt);
1051 destroy_fidpool:
1052         p9_idpool_destroy(clnt->fidpool);
1053 put_trans:
1054         v9fs_put_trans(clnt->trans_mod);
1055 destroy_tagpool:
1056         p9_idpool_destroy(clnt->tagpool);
1057 free_client:
1058         kfree(clnt);
1059         return ERR_PTR(err);
1060 }
1061 EXPORT_SYMBOL(p9_client_create);
1062 
1063 void p9_client_destroy(struct p9_client *clnt)
1064 {
1065         struct p9_fid *fid, *fidptr;
1066 
1067         p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1068 
1069         if (clnt->trans_mod)
1070                 clnt->trans_mod->close(clnt);
1071 
1072         v9fs_put_trans(clnt->trans_mod);
1073 
1074         list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1075                 pr_info("Found fid %d not clunked\n", fid->fid);
1076                 p9_fid_destroy(fid);
1077         }
1078 
1079         if (clnt->fidpool)
1080                 p9_idpool_destroy(clnt->fidpool);
1081 
1082         p9_tag_cleanup(clnt);
1083 
1084         kfree(clnt);
1085 }
1086 EXPORT_SYMBOL(p9_client_destroy);
1087 
1088 void p9_client_disconnect(struct p9_client *clnt)
1089 {
1090         p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1091         clnt->status = Disconnected;
1092 }
1093 EXPORT_SYMBOL(p9_client_disconnect);
1094 
1095 void p9_client_begin_disconnect(struct p9_client *clnt)
1096 {
1097         p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1098         clnt->status = BeginDisconnect;
1099 }
1100 EXPORT_SYMBOL(p9_client_begin_disconnect);
1101 
1102 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1103         char *uname, kuid_t n_uname, char *aname)
1104 {
1105         int err = 0;
1106         struct p9_req_t *req;
1107         struct p9_fid *fid;
1108         struct p9_qid qid;
1109 
1110 
1111         p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1112                  afid ? afid->fid : -1, uname, aname);
1113         fid = p9_fid_create(clnt);
1114         if (IS_ERR(fid)) {
1115                 err = PTR_ERR(fid);
1116                 fid = NULL;
1117                 goto error;
1118         }
1119 
1120         req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1121                         afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1122         if (IS_ERR(req)) {
1123                 err = PTR_ERR(req);
1124                 goto error;
1125         }
1126 
1127         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1128         if (err) {
1129                 trace_9p_protocol_dump(clnt, req->rc);
1130                 p9_free_req(clnt, req);
1131                 goto error;
1132         }
1133 
1134         p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1135                  qid.type, (unsigned long long)qid.path, qid.version);
1136 
1137         memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1138 
1139         p9_free_req(clnt, req);
1140         return fid;
1141 
1142 error:
1143         if (fid)
1144                 p9_fid_destroy(fid);
1145         return ERR_PTR(err);
1146 }
1147 EXPORT_SYMBOL(p9_client_attach);
1148 
1149 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1150                 char **wnames, int clone)
1151 {
1152         int err;
1153         struct p9_client *clnt;
1154         struct p9_fid *fid;
1155         struct p9_qid *wqids;
1156         struct p9_req_t *req;
1157         uint16_t nwqids, count;
1158 
1159         err = 0;
1160         wqids = NULL;
1161         clnt = oldfid->clnt;
1162         if (clone) {
1163                 fid = p9_fid_create(clnt);
1164                 if (IS_ERR(fid)) {
1165                         err = PTR_ERR(fid);
1166                         fid = NULL;
1167                         goto error;
1168                 }
1169 
1170                 fid->uid = oldfid->uid;
1171         } else
1172                 fid = oldfid;
1173 
1174 
1175         p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1176                  oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1177 
1178         req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1179                                                                 nwname, wnames);
1180         if (IS_ERR(req)) {
1181                 err = PTR_ERR(req);
1182                 goto error;
1183         }
1184 
1185         err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1186         if (err) {
1187                 trace_9p_protocol_dump(clnt, req->rc);
1188                 p9_free_req(clnt, req);
1189                 goto clunk_fid;
1190         }
1191         p9_free_req(clnt, req);
1192 
1193         p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1194 
1195         if (nwqids != nwname) {
1196                 err = -ENOENT;
1197                 goto clunk_fid;
1198         }
1199 
1200         for (count = 0; count < nwqids; count++)
1201                 p9_debug(P9_DEBUG_9P, "<<<     [%d] %x.%llx.%x\n",
1202                         count, wqids[count].type,
1203                         (unsigned long long)wqids[count].path,
1204                         wqids[count].version);
1205 
1206         if (nwname)
1207                 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1208         else
1209                 fid->qid = oldfid->qid;
1210 
1211         kfree(wqids);
1212         return fid;
1213 
1214 clunk_fid:
1215         kfree(wqids);
1216         p9_client_clunk(fid);
1217         fid = NULL;
1218 
1219 error:
1220         if (fid && (fid != oldfid))
1221                 p9_fid_destroy(fid);
1222 
1223         return ERR_PTR(err);
1224 }
1225 EXPORT_SYMBOL(p9_client_walk);
1226 
1227 int p9_client_open(struct p9_fid *fid, int mode)
1228 {
1229         int err;
1230         struct p9_client *clnt;
1231         struct p9_req_t *req;
1232         struct p9_qid qid;
1233         int iounit;
1234 
1235         clnt = fid->clnt;
1236         p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1237                 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1238         err = 0;
1239 
1240         if (fid->mode != -1)
1241                 return -EINVAL;
1242 
1243         if (p9_is_proto_dotl(clnt))
1244                 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1245         else
1246                 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1247         if (IS_ERR(req)) {
1248                 err = PTR_ERR(req);
1249                 goto error;
1250         }
1251 
1252         err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1253         if (err) {
1254                 trace_9p_protocol_dump(clnt, req->rc);
1255                 goto free_and_error;
1256         }
1257 
1258         p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1259                 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN",  qid.type,
1260                 (unsigned long long)qid.path, qid.version, iounit);
1261 
1262         fid->mode = mode;
1263         fid->iounit = iounit;
1264 
1265 free_and_error:
1266         p9_free_req(clnt, req);
1267 error:
1268         return err;
1269 }
1270 EXPORT_SYMBOL(p9_client_open);
1271 
1272 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1273                 kgid_t gid, struct p9_qid *qid)
1274 {
1275         int err = 0;
1276         struct p9_client *clnt;
1277         struct p9_req_t *req;
1278         int iounit;
1279 
1280         p9_debug(P9_DEBUG_9P,
1281                         ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1282                         ofid->fid, name, flags, mode,
1283                         from_kgid(&init_user_ns, gid));
1284         clnt = ofid->clnt;
1285 
1286         if (ofid->mode != -1)
1287                 return -EINVAL;
1288 
1289         req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1290                         mode, gid);
1291         if (IS_ERR(req)) {
1292                 err = PTR_ERR(req);
1293                 goto error;
1294         }
1295 
1296         err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1297         if (err) {
1298                 trace_9p_protocol_dump(clnt, req->rc);
1299                 goto free_and_error;
1300         }
1301 
1302         p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1303                         qid->type,
1304                         (unsigned long long)qid->path,
1305                         qid->version, iounit);
1306 
1307         ofid->mode = mode;
1308         ofid->iounit = iounit;
1309 
1310 free_and_error:
1311         p9_free_req(clnt, req);
1312 error:
1313         return err;
1314 }
1315 EXPORT_SYMBOL(p9_client_create_dotl);
1316 
1317 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1318                      char *extension)
1319 {
1320         int err;
1321         struct p9_client *clnt;
1322         struct p9_req_t *req;
1323         struct p9_qid qid;
1324         int iounit;
1325 
1326         p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1327                                                 fid->fid, name, perm, mode);
1328         err = 0;
1329         clnt = fid->clnt;
1330 
1331         if (fid->mode != -1)
1332                 return -EINVAL;
1333 
1334         req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1335                                 mode, extension);
1336         if (IS_ERR(req)) {
1337                 err = PTR_ERR(req);
1338                 goto error;
1339         }
1340 
1341         err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1342         if (err) {
1343                 trace_9p_protocol_dump(clnt, req->rc);
1344                 goto free_and_error;
1345         }
1346 
1347         p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1348                                 qid.type,
1349                                 (unsigned long long)qid.path,
1350                                 qid.version, iounit);
1351 
1352         fid->mode = mode;
1353         fid->iounit = iounit;
1354 
1355 free_and_error:
1356         p9_free_req(clnt, req);
1357 error:
1358         return err;
1359 }
1360 EXPORT_SYMBOL(p9_client_fcreate);
1361 
1362 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, kgid_t gid,
1363                 struct p9_qid *qid)
1364 {
1365         int err = 0;
1366         struct p9_client *clnt;
1367         struct p9_req_t *req;
1368 
1369         p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s  symtgt %s\n",
1370                         dfid->fid, name, symtgt);
1371         clnt = dfid->clnt;
1372 
1373         req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1374                         gid);
1375         if (IS_ERR(req)) {
1376                 err = PTR_ERR(req);
1377                 goto error;
1378         }
1379 
1380         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1381         if (err) {
1382                 trace_9p_protocol_dump(clnt, req->rc);
1383                 goto free_and_error;
1384         }
1385 
1386         p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1387                         qid->type, (unsigned long long)qid->path, qid->version);
1388 
1389 free_and_error:
1390         p9_free_req(clnt, req);
1391 error:
1392         return err;
1393 }
1394 EXPORT_SYMBOL(p9_client_symlink);
1395 
1396 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1397 {
1398         struct p9_client *clnt;
1399         struct p9_req_t *req;
1400 
1401         p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1402                         dfid->fid, oldfid->fid, newname);
1403         clnt = dfid->clnt;
1404         req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1405                         newname);
1406         if (IS_ERR(req))
1407                 return PTR_ERR(req);
1408 
1409         p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1410         p9_free_req(clnt, req);
1411         return 0;
1412 }
1413 EXPORT_SYMBOL(p9_client_link);
1414 
1415 int p9_client_fsync(struct p9_fid *fid, int datasync)
1416 {
1417         int err;
1418         struct p9_client *clnt;
1419         struct p9_req_t *req;
1420 
1421         p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1422                         fid->fid, datasync);
1423         err = 0;
1424         clnt = fid->clnt;
1425 
1426         req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1427         if (IS_ERR(req)) {
1428                 err = PTR_ERR(req);
1429                 goto error;
1430         }
1431 
1432         p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1433 
1434         p9_free_req(clnt, req);
1435 
1436 error:
1437         return err;
1438 }
1439 EXPORT_SYMBOL(p9_client_fsync);
1440 
1441 int p9_client_clunk(struct p9_fid *fid)
1442 {
1443         int err;
1444         struct p9_client *clnt;
1445         struct p9_req_t *req;
1446         int retries = 0;
1447 
1448         if (!fid) {
1449                 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1450                         __func__, task_pid_nr(current));
1451                 dump_stack();
1452                 return 0;
1453         }
1454 
1455 again:
1456         p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1457                                                                 retries);
1458         err = 0;
1459         clnt = fid->clnt;
1460 
1461         req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1462         if (IS_ERR(req)) {
1463                 err = PTR_ERR(req);
1464                 goto error;
1465         }
1466 
1467         p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1468 
1469         p9_free_req(clnt, req);
1470 error:
1471         /*
1472          * Fid is not valid even after a failed clunk
1473          * If interrupted, retry once then give up and
1474          * leak fid until umount.
1475          */
1476         if (err == -ERESTARTSYS) {
1477                 if (retries++ == 0)
1478                         goto again;
1479         } else
1480                 p9_fid_destroy(fid);
1481         return err;
1482 }
1483 EXPORT_SYMBOL(p9_client_clunk);
1484 
1485 int p9_client_remove(struct p9_fid *fid)
1486 {
1487         int err;
1488         struct p9_client *clnt;
1489         struct p9_req_t *req;
1490 
1491         p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1492         err = 0;
1493         clnt = fid->clnt;
1494 
1495         req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1496         if (IS_ERR(req)) {
1497                 err = PTR_ERR(req);
1498                 goto error;
1499         }
1500 
1501         p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1502 
1503         p9_free_req(clnt, req);
1504 error:
1505         if (err == -ERESTARTSYS)
1506                 p9_client_clunk(fid);
1507         else
1508                 p9_fid_destroy(fid);
1509         return err;
1510 }
1511 EXPORT_SYMBOL(p9_client_remove);
1512 
1513 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1514 {
1515         int err = 0;
1516         struct p9_req_t *req;
1517         struct p9_client *clnt;
1518 
1519         p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1520                    dfid->fid, name, flags);
1521 
1522         clnt = dfid->clnt;
1523         req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1524         if (IS_ERR(req)) {
1525                 err = PTR_ERR(req);
1526                 goto error;
1527         }
1528         p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1529 
1530         p9_free_req(clnt, req);
1531 error:
1532         return err;
1533 }
1534 EXPORT_SYMBOL(p9_client_unlinkat);
1535 
1536 int
1537 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1538                                                                 u32 count)
1539 {
1540         char *dataptr;
1541         int kernel_buf = 0;
1542         struct p9_req_t *req;
1543         struct p9_client *clnt;
1544         int err, rsize, non_zc = 0;
1545 
1546 
1547         p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1548                    fid->fid, (unsigned long long) offset, count);
1549         err = 0;
1550         clnt = fid->clnt;
1551 
1552         rsize = fid->iounit;
1553         if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1554                 rsize = clnt->msize - P9_IOHDRSZ;
1555 
1556         if (count < rsize)
1557                 rsize = count;
1558 
1559         /* Don't bother zerocopy for small IO (< 1024) */
1560         if (clnt->trans_mod->zc_request && rsize > 1024) {
1561                 char *indata;
1562                 if (data) {
1563                         kernel_buf = 1;
1564                         indata = data;
1565                 } else
1566                         indata = (__force char *)udata;
1567                 /*
1568                  * response header len is 11
1569                  * PDU Header(7) + IO Size (4)
1570                  */
1571                 req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0,
1572                                        11, kernel_buf, "dqd", fid->fid,
1573                                        offset, rsize);
1574         } else {
1575                 non_zc = 1;
1576                 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1577                                     rsize);
1578         }
1579         if (IS_ERR(req)) {
1580                 err = PTR_ERR(req);
1581                 goto error;
1582         }
1583 
1584         err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1585         if (err) {
1586                 trace_9p_protocol_dump(clnt, req->rc);
1587                 goto free_and_error;
1588         }
1589 
1590         p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1591 
1592         if (non_zc) {
1593                 if (data) {
1594                         memmove(data, dataptr, count);
1595                 } else {
1596                         err = copy_to_user(udata, dataptr, count);
1597                         if (err) {
1598                                 err = -EFAULT;
1599                                 goto free_and_error;
1600                         }
1601                 }
1602         }
1603         p9_free_req(clnt, req);
1604         return count;
1605 
1606 free_and_error:
1607         p9_free_req(clnt, req);
1608 error:
1609         return err;
1610 }
1611 EXPORT_SYMBOL(p9_client_read);
1612 
1613 int
1614 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1615                                                         u64 offset, u32 count)
1616 {
1617         int err, rsize;
1618         int kernel_buf = 0;
1619         struct p9_client *clnt;
1620         struct p9_req_t *req;
1621 
1622         p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1623                                 fid->fid, (unsigned long long) offset, count);
1624         err = 0;
1625         clnt = fid->clnt;
1626 
1627         rsize = fid->iounit;
1628         if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1629                 rsize = clnt->msize - P9_IOHDRSZ;
1630 
1631         if (count < rsize)
1632                 rsize = count;
1633 
1634         /* Don't bother zerocopy for small IO (< 1024) */
1635         if (clnt->trans_mod->zc_request && rsize > 1024) {
1636                 char *odata;
1637                 if (data) {
1638                         kernel_buf = 1;
1639                         odata = data;
1640                 } else
1641                         odata = (char *)udata;
1642                 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize,
1643                                        P9_ZC_HDR_SZ, kernel_buf, "dqd",
1644                                        fid->fid, offset, rsize);
1645         } else {
1646                 if (data)
1647                         req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
1648                                             offset, rsize, data);
1649                 else
1650                         req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
1651                                             offset, rsize, udata);
1652         }
1653         if (IS_ERR(req)) {
1654                 err = PTR_ERR(req);
1655                 goto error;
1656         }
1657 
1658         err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1659         if (err) {
1660                 trace_9p_protocol_dump(clnt, req->rc);
1661                 goto free_and_error;
1662         }
1663 
1664         p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1665 
1666         p9_free_req(clnt, req);
1667         return count;
1668 
1669 free_and_error:
1670         p9_free_req(clnt, req);
1671 error:
1672         return err;
1673 }
1674 EXPORT_SYMBOL(p9_client_write);
1675 
1676 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1677 {
1678         int err;
1679         struct p9_client *clnt;
1680         struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1681         struct p9_req_t *req;
1682         u16 ignored;
1683 
1684         p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1685 
1686         if (!ret)
1687                 return ERR_PTR(-ENOMEM);
1688 
1689         err = 0;
1690         clnt = fid->clnt;
1691 
1692         req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1693         if (IS_ERR(req)) {
1694                 err = PTR_ERR(req);
1695                 goto error;
1696         }
1697 
1698         err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1699         if (err) {
1700                 trace_9p_protocol_dump(clnt, req->rc);
1701                 p9_free_req(clnt, req);
1702                 goto error;
1703         }
1704 
1705         p9_debug(P9_DEBUG_9P,
1706                 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1707                 "<<<    mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1708                 "<<<    name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1709                 "<<<    uid=%d gid=%d n_muid=%d\n",
1710                 ret->size, ret->type, ret->dev, ret->qid.type,
1711                 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1712                 ret->atime, ret->mtime, (unsigned long long)ret->length,
1713                 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1714                 from_kuid(&init_user_ns, ret->n_uid),
1715                 from_kgid(&init_user_ns, ret->n_gid),
1716                 from_kuid(&init_user_ns, ret->n_muid));
1717 
1718         p9_free_req(clnt, req);
1719         return ret;
1720 
1721 error:
1722         kfree(ret);
1723         return ERR_PTR(err);
1724 }
1725 EXPORT_SYMBOL(p9_client_stat);
1726 
1727 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1728                                                         u64 request_mask)
1729 {
1730         int err;
1731         struct p9_client *clnt;
1732         struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1733                                                                 GFP_KERNEL);
1734         struct p9_req_t *req;
1735 
1736         p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1737                                                         fid->fid, request_mask);
1738 
1739         if (!ret)
1740                 return ERR_PTR(-ENOMEM);
1741 
1742         err = 0;
1743         clnt = fid->clnt;
1744 
1745         req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1746         if (IS_ERR(req)) {
1747                 err = PTR_ERR(req);
1748                 goto error;
1749         }
1750 
1751         err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1752         if (err) {
1753                 trace_9p_protocol_dump(clnt, req->rc);
1754                 p9_free_req(clnt, req);
1755                 goto error;
1756         }
1757 
1758         p9_debug(P9_DEBUG_9P,
1759                 "<<< RGETATTR st_result_mask=%lld\n"
1760                 "<<< qid=%x.%llx.%x\n"
1761                 "<<< st_mode=%8.8x st_nlink=%llu\n"
1762                 "<<< st_uid=%d st_gid=%d\n"
1763                 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1764                 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1765                 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1766                 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1767                 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1768                 "<<< st_gen=%lld st_data_version=%lld",
1769                 ret->st_result_mask, ret->qid.type, ret->qid.path,
1770                 ret->qid.version, ret->st_mode, ret->st_nlink,
1771                 from_kuid(&init_user_ns, ret->st_uid),
1772                 from_kgid(&init_user_ns, ret->st_gid),
1773                 ret->st_rdev, ret->st_size, ret->st_blksize,
1774                 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1775                 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1776                 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1777                 ret->st_gen, ret->st_data_version);
1778 
1779         p9_free_req(clnt, req);
1780         return ret;
1781 
1782 error:
1783         kfree(ret);
1784         return ERR_PTR(err);
1785 }
1786 EXPORT_SYMBOL(p9_client_getattr_dotl);
1787 
1788 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1789 {
1790         int ret;
1791 
1792         /* NOTE: size shouldn't include its own length */
1793         /* size[2] type[2] dev[4] qid[13] */
1794         /* mode[4] atime[4] mtime[4] length[8]*/
1795         /* name[s] uid[s] gid[s] muid[s] */
1796         ret = 2+4+13+4+4+4+8+2+2+2+2;
1797 
1798         if (wst->name)
1799                 ret += strlen(wst->name);
1800         if (wst->uid)
1801                 ret += strlen(wst->uid);
1802         if (wst->gid)
1803                 ret += strlen(wst->gid);
1804         if (wst->muid)
1805                 ret += strlen(wst->muid);
1806 
1807         if ((proto_version == p9_proto_2000u) ||
1808                 (proto_version == p9_proto_2000L)) {
1809                 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1810                 if (wst->extension)
1811                         ret += strlen(wst->extension);
1812         }
1813 
1814         return ret;
1815 }
1816 
1817 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1818 {
1819         int err;
1820         struct p9_req_t *req;
1821         struct p9_client *clnt;
1822 
1823         err = 0;
1824         clnt = fid->clnt;
1825         wst->size = p9_client_statsize(wst, clnt->proto_version);
1826         p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1827         p9_debug(P9_DEBUG_9P,
1828                 "     sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1829                 "     mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1830                 "     name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1831                 "     uid=%d gid=%d n_muid=%d\n",
1832                 wst->size, wst->type, wst->dev, wst->qid.type,
1833                 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1834                 wst->atime, wst->mtime, (unsigned long long)wst->length,
1835                 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1836                 from_kuid(&init_user_ns, wst->n_uid),
1837                 from_kgid(&init_user_ns, wst->n_gid),
1838                 from_kuid(&init_user_ns, wst->n_muid));
1839 
1840         req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1841         if (IS_ERR(req)) {
1842                 err = PTR_ERR(req);
1843                 goto error;
1844         }
1845 
1846         p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1847 
1848         p9_free_req(clnt, req);
1849 error:
1850         return err;
1851 }
1852 EXPORT_SYMBOL(p9_client_wstat);
1853 
1854 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1855 {
1856         int err;
1857         struct p9_req_t *req;
1858         struct p9_client *clnt;
1859 
1860         err = 0;
1861         clnt = fid->clnt;
1862         p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1863         p9_debug(P9_DEBUG_9P,
1864                 "    valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1865                 "    atime_sec=%lld atime_nsec=%lld\n"
1866                 "    mtime_sec=%lld mtime_nsec=%lld\n",
1867                 p9attr->valid, p9attr->mode,
1868                 from_kuid(&init_user_ns, p9attr->uid),
1869                 from_kgid(&init_user_ns, p9attr->gid),
1870                 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1871                 p9attr->mtime_sec, p9attr->mtime_nsec);
1872 
1873         req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1874 
1875         if (IS_ERR(req)) {
1876                 err = PTR_ERR(req);
1877                 goto error;
1878         }
1879         p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1880         p9_free_req(clnt, req);
1881 error:
1882         return err;
1883 }
1884 EXPORT_SYMBOL(p9_client_setattr);
1885 
1886 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1887 {
1888         int err;
1889         struct p9_req_t *req;
1890         struct p9_client *clnt;
1891 
1892         err = 0;
1893         clnt = fid->clnt;
1894 
1895         p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1896 
1897         req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1898         if (IS_ERR(req)) {
1899                 err = PTR_ERR(req);
1900                 goto error;
1901         }
1902 
1903         err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1904                 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1905                 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1906         if (err) {
1907                 trace_9p_protocol_dump(clnt, req->rc);
1908                 p9_free_req(clnt, req);
1909                 goto error;
1910         }
1911 
1912         p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1913                 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1914                 "fsid %llu namelen %ld\n",
1915                 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1916                 sb->blocks, sb->bfree, sb->bavail, sb->files,  sb->ffree,
1917                 sb->fsid, (long int)sb->namelen);
1918 
1919         p9_free_req(clnt, req);
1920 error:
1921         return err;
1922 }
1923 EXPORT_SYMBOL(p9_client_statfs);
1924 
1925 int p9_client_rename(struct p9_fid *fid,
1926                      struct p9_fid *newdirfid, const char *name)
1927 {
1928         int err;
1929         struct p9_req_t *req;
1930         struct p9_client *clnt;
1931 
1932         err = 0;
1933         clnt = fid->clnt;
1934 
1935         p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1936                         fid->fid, newdirfid->fid, name);
1937 
1938         req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1939                         newdirfid->fid, name);
1940         if (IS_ERR(req)) {
1941                 err = PTR_ERR(req);
1942                 goto error;
1943         }
1944 
1945         p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1946 
1947         p9_free_req(clnt, req);
1948 error:
1949         return err;
1950 }
1951 EXPORT_SYMBOL(p9_client_rename);
1952 
1953 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1954                        struct p9_fid *newdirfid, const char *new_name)
1955 {
1956         int err;
1957         struct p9_req_t *req;
1958         struct p9_client *clnt;
1959 
1960         err = 0;
1961         clnt = olddirfid->clnt;
1962 
1963         p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1964                    " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1965                    newdirfid->fid, new_name);
1966 
1967         req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1968                             old_name, newdirfid->fid, new_name);
1969         if (IS_ERR(req)) {
1970                 err = PTR_ERR(req);
1971                 goto error;
1972         }
1973 
1974         p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1975                    newdirfid->fid, new_name);
1976 
1977         p9_free_req(clnt, req);
1978 error:
1979         return err;
1980 }
1981 EXPORT_SYMBOL(p9_client_renameat);
1982 
1983 /*
1984  * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1985  */
1986 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1987                                 const char *attr_name, u64 *attr_size)
1988 {
1989         int err;
1990         struct p9_req_t *req;
1991         struct p9_client *clnt;
1992         struct p9_fid *attr_fid;
1993 
1994         err = 0;
1995         clnt = file_fid->clnt;
1996         attr_fid = p9_fid_create(clnt);
1997         if (IS_ERR(attr_fid)) {
1998                 err = PTR_ERR(attr_fid);
1999                 attr_fid = NULL;
2000                 goto error;
2001         }
2002         p9_debug(P9_DEBUG_9P,
2003                 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2004                 file_fid->fid, attr_fid->fid, attr_name);
2005 
2006         req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2007                         file_fid->fid, attr_fid->fid, attr_name);
2008         if (IS_ERR(req)) {
2009                 err = PTR_ERR(req);
2010                 goto error;
2011         }
2012         err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
2013         if (err) {
2014                 trace_9p_protocol_dump(clnt, req->rc);
2015                 p9_free_req(clnt, req);
2016                 goto clunk_fid;
2017         }
2018         p9_free_req(clnt, req);
2019         p9_debug(P9_DEBUG_9P, "<<<  RXATTRWALK fid %d size %llu\n",
2020                 attr_fid->fid, *attr_size);
2021         return attr_fid;
2022 clunk_fid:
2023         p9_client_clunk(attr_fid);
2024         attr_fid = NULL;
2025 error:
2026         if (attr_fid && (attr_fid != file_fid))
2027                 p9_fid_destroy(attr_fid);
2028 
2029         return ERR_PTR(err);
2030 }
2031 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2032 
2033 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2034                         u64 attr_size, int flags)
2035 {
2036         int err;
2037         struct p9_req_t *req;
2038         struct p9_client *clnt;
2039 
2040         p9_debug(P9_DEBUG_9P,
2041                 ">>> TXATTRCREATE fid %d name  %s size %lld flag %d\n",
2042                 fid->fid, name, (long long)attr_size, flags);
2043         err = 0;
2044         clnt = fid->clnt;
2045         req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2046                         fid->fid, name, attr_size, flags);
2047         if (IS_ERR(req)) {
2048                 err = PTR_ERR(req);
2049                 goto error;
2050         }
2051         p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2052         p9_free_req(clnt, req);
2053 error:
2054         return err;
2055 }
2056 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2057 
2058 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2059 {
2060         int err, rsize, non_zc = 0;
2061         struct p9_client *clnt;
2062         struct p9_req_t *req;
2063         char *dataptr;
2064 
2065         p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2066                                 fid->fid, (unsigned long long) offset, count);
2067 
2068         err = 0;
2069         clnt = fid->clnt;
2070 
2071         rsize = fid->iounit;
2072         if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2073                 rsize = clnt->msize - P9_READDIRHDRSZ;
2074 
2075         if (count < rsize)
2076                 rsize = count;
2077 
2078         /* Don't bother zerocopy for small IO (< 1024) */
2079         if (clnt->trans_mod->zc_request && rsize > 1024) {
2080                 /*
2081                  * response header len is 11
2082                  * PDU Header(7) + IO Size (4)
2083                  */
2084                 req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0,
2085                                        11, 1, "dqd", fid->fid, offset, rsize);
2086         } else {
2087                 non_zc = 1;
2088                 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2089                                     offset, rsize);
2090         }
2091         if (IS_ERR(req)) {
2092                 err = PTR_ERR(req);
2093                 goto error;
2094         }
2095 
2096         err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2097         if (err) {
2098                 trace_9p_protocol_dump(clnt, req->rc);
2099                 goto free_and_error;
2100         }
2101 
2102         p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2103 
2104         if (non_zc)
2105                 memmove(data, dataptr, count);
2106 
2107         p9_free_req(clnt, req);
2108         return count;
2109 
2110 free_and_error:
2111         p9_free_req(clnt, req);
2112 error:
2113         return err;
2114 }
2115 EXPORT_SYMBOL(p9_client_readdir);
2116 
2117 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
2118                         dev_t rdev, kgid_t gid, struct p9_qid *qid)
2119 {
2120         int err;
2121         struct p9_client *clnt;
2122         struct p9_req_t *req;
2123 
2124         err = 0;
2125         clnt = fid->clnt;
2126         p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2127                 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2128         req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2129                 MAJOR(rdev), MINOR(rdev), gid);
2130         if (IS_ERR(req))
2131                 return PTR_ERR(req);
2132 
2133         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2134         if (err) {
2135                 trace_9p_protocol_dump(clnt, req->rc);
2136                 goto error;
2137         }
2138         p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2139                                 (unsigned long long)qid->path, qid->version);
2140 
2141 error:
2142         p9_free_req(clnt, req);
2143         return err;
2144 
2145 }
2146 EXPORT_SYMBOL(p9_client_mknod_dotl);
2147 
2148 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
2149                                 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, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2158                  fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2159         req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
2160                 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, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2170                                 (unsigned long long)qid->path, qid->version);
2171 
2172 error:
2173         p9_free_req(clnt, req);
2174         return err;
2175 
2176 }
2177 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2178 
2179 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2180 {
2181         int err;
2182         struct p9_client *clnt;
2183         struct p9_req_t *req;
2184 
2185         err = 0;
2186         clnt = fid->clnt;
2187         p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2188                         "start %lld length %lld proc_id %d client_id %s\n",
2189                         fid->fid, flock->type, flock->flags, flock->start,
2190                         flock->length, flock->proc_id, flock->client_id);
2191 
2192         req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2193                                 flock->flags, flock->start, flock->length,
2194                                         flock->proc_id, flock->client_id);
2195 
2196         if (IS_ERR(req))
2197                 return PTR_ERR(req);
2198 
2199         err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2200         if (err) {
2201                 trace_9p_protocol_dump(clnt, req->rc);
2202                 goto error;
2203         }
2204         p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2205 error:
2206         p9_free_req(clnt, req);
2207         return err;
2208 
2209 }
2210 EXPORT_SYMBOL(p9_client_lock_dotl);
2211 
2212 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2213 {
2214         int err;
2215         struct p9_client *clnt;
2216         struct p9_req_t *req;
2217 
2218         err = 0;
2219         clnt = fid->clnt;
2220         p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2221                 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2222                 glock->start, glock->length, glock->proc_id, glock->client_id);
2223 
2224         req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid,  glock->type,
2225                 glock->start, glock->length, glock->proc_id, glock->client_id);
2226 
2227         if (IS_ERR(req))
2228                 return PTR_ERR(req);
2229 
2230         err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2231                         &glock->start, &glock->length, &glock->proc_id,
2232                         &glock->client_id);
2233         if (err) {
2234                 trace_9p_protocol_dump(clnt, req->rc);
2235                 goto error;
2236         }
2237         p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2238                 "proc_id %d client_id %s\n", glock->type, glock->start,
2239                 glock->length, glock->proc_id, glock->client_id);
2240 error:
2241         p9_free_req(clnt, req);
2242         return err;
2243 }
2244 EXPORT_SYMBOL(p9_client_getlock_dotl);
2245 
2246 int p9_client_readlink(struct p9_fid *fid, char **target)
2247 {
2248         int err;
2249         struct p9_client *clnt;
2250         struct p9_req_t *req;
2251 
2252         err = 0;
2253         clnt = fid->clnt;
2254         p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2255 
2256         req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2257         if (IS_ERR(req))
2258                 return PTR_ERR(req);
2259 
2260         err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2261         if (err) {
2262                 trace_9p_protocol_dump(clnt, req->rc);
2263                 goto error;
2264         }
2265         p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2266 error:
2267         p9_free_req(clnt, req);
2268         return err;
2269 }
2270 EXPORT_SYMBOL(p9_client_readlink);
2271 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp