6 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
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.
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.
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
26 #include <linux/module.h>
27 #include <linux/errno.h>
29 #include <linux/poll.h>
30 #include <linux/idr.h>
31 #include <linux/mutex.h>
32 #include <linux/sched.h>
33 #include <linux/uaccess.h>
34 #include <net/9p/9p.h>
35 #include <linux/parser.h>
36 #include <net/9p/client.h>
37 #include <net/9p/transport.h>
41 * Client Option Parsing (code inspired by NFS code)
42 * - a little lazy - parse all client options
52 static const match_table_t tokens = {
53 {Opt_msize, "msize=%u"},
54 {Opt_legacy, "noextend"},
55 {Opt_trans, "trans=%s"},
59 static struct p9_req_t *
60 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
63 * parse_options - parse mount options into client structure
64 * @opts: options string passed from mount
65 * @clnt: existing v9fs client information
67 * Return 0 upon success, -ERRNO upon failure
70 static int parse_opts(char *opts, struct p9_client *clnt)
74 substring_t args[MAX_OPT_ARGS];
84 options = kstrdup(opts, GFP_KERNEL);
86 P9_DPRINTK(P9_DEBUG_ERROR,
87 "failed to allocate copy of option string\n");
91 while ((p = strsep(&options, ",")) != NULL) {
95 token = match_token(p, tokens, args);
96 if (token < Opt_trans) {
97 int r = match_int(&args[0], &option);
99 P9_DPRINTK(P9_DEBUG_ERROR,
100 "integer field, but no integer?\n");
107 clnt->msize = option;
110 clnt->trans_mod = v9fs_get_trans_by_name(&args[0]);
125 * p9_tag_alloc - lookup/allocate a request by tag
126 * @c: client session to lookup tag within
127 * @tag: numeric id for transaction
129 * this is a simple array lookup, but will grow the
130 * request_slots as necessary to accomodate transaction
131 * ids which did not previously have a slot.
133 * this code relies on the client spinlock to manage locks, its
134 * possible we should switch to something else, but I'd rather
135 * stick with something low-overhead for the common case.
139 static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag)
143 struct p9_req_t *req;
145 /* This looks up the original request by tag so we know which
146 * buffer to read the data into */
149 if (tag >= c->max_tag) {
150 spin_lock_irqsave(&c->lock, flags);
151 /* check again since original check was outside of lock */
152 while (tag >= c->max_tag) {
153 row = (tag / P9_ROW_MAXTAG);
154 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
155 sizeof(struct p9_req_t), GFP_ATOMIC);
158 printk(KERN_ERR "Couldn't grow tag array\n");
159 spin_unlock_irqrestore(&c->lock, flags);
160 return ERR_PTR(-ENOMEM);
162 for (col = 0; col < P9_ROW_MAXTAG; col++) {
163 c->reqs[row][col].status = REQ_STATUS_IDLE;
164 c->reqs[row][col].tc = NULL;
166 c->max_tag += P9_ROW_MAXTAG;
168 spin_unlock_irqrestore(&c->lock, flags);
170 row = tag / P9_ROW_MAXTAG;
171 col = tag % P9_ROW_MAXTAG;
173 req = &c->reqs[row][col];
175 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_KERNEL);
177 printk(KERN_ERR "Couldn't grow tag array\n");
178 return ERR_PTR(-ENOMEM);
180 init_waitqueue_head(req->wq);
181 req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize,
183 req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize,
185 if ((!req->tc) || (!req->rc)) {
186 printk(KERN_ERR "Couldn't grow tag array\n");
190 req->tc = req->rc = NULL;
192 return ERR_PTR(-ENOMEM);
194 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
195 req->tc->capacity = c->msize;
196 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
197 req->rc->capacity = c->msize;
200 p9pdu_reset(req->tc);
201 p9pdu_reset(req->rc);
203 req->tc->tag = tag-1;
204 req->status = REQ_STATUS_ALLOC;
206 return &c->reqs[row][col];
210 * p9_tag_lookup - lookup a request by tag
211 * @c: client session to lookup tag within
212 * @tag: numeric id for transaction
216 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
220 /* This looks up the original request by tag so we know which
221 * buffer to read the data into */
224 BUG_ON(tag >= c->max_tag);
226 row = tag / P9_ROW_MAXTAG;
227 col = tag % P9_ROW_MAXTAG;
229 return &c->reqs[row][col];
231 EXPORT_SYMBOL(p9_tag_lookup);
234 * p9_tag_init - setup tags structure and contents
235 * @c: v9fs client struct
237 * This initializes the tags structure for each client instance.
241 static int p9_tag_init(struct p9_client *c)
245 c->tagpool = p9_idpool_create();
246 if (IS_ERR(c->tagpool)) {
247 err = PTR_ERR(c->tagpool);
252 p9_idpool_get(c->tagpool); /* reserve tag 0 */
260 * p9_tag_cleanup - cleans up tags structure and reclaims resources
261 * @c: v9fs client struct
263 * This frees resources associated with the tags structure
266 static void p9_tag_cleanup(struct p9_client *c)
270 /* check to insure all requests are idle */
271 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
272 for (col = 0; col < P9_ROW_MAXTAG; col++) {
273 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
274 P9_DPRINTK(P9_DEBUG_MUX,
275 "Attempting to cleanup non-free tag %d,%d\n",
277 /* TODO: delay execution of cleanup */
284 p9_idpool_destroy(c->tagpool);
286 /* free requests associated with tags */
287 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
288 for (col = 0; col < P9_ROW_MAXTAG; col++) {
289 kfree(c->reqs[row][col].wq);
290 kfree(c->reqs[row][col].tc);
291 kfree(c->reqs[row][col].rc);
299 * p9_free_req - free a request and clean-up as necessary
301 * r: request to release
305 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
307 int tag = r->tc->tag;
308 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
310 r->status = REQ_STATUS_IDLE;
311 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
312 p9_idpool_put(tag, c->tagpool);
316 * p9_client_cb - call back from transport to client
318 * req: request received
321 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
323 P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
325 P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
327 EXPORT_SYMBOL(p9_client_cb);
330 * p9_parse_header - parse header arguments out of a packet
331 * @pdu: packet to parse
332 * @size: size of packet
333 * @type: type of request
334 * @tag: tag of packet
335 * @rewind: set if we need to rewind offset afterwards
339 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
345 int offset = pdu->offset;
352 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
354 goto rewind_and_exit;
360 P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size,
373 pdu->offset = offset;
376 EXPORT_SYMBOL(p9_parse_header);
379 * p9_check_errors - check 9p packet for error return and process it
380 * @c: current client instance
381 * @req: request to parse and check for error conditions
383 * returns error code if one is discovered, otherwise returns 0
385 * this will have to be more complicated if we have multiple
389 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
394 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
396 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
400 if (type == P9_RERROR) {
404 err = p9pdu_readf(req->rc, c->dotu, "s?d", &ename, &ecode);
406 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n",
414 if (!err || !IS_ERR_VALUE(err))
415 err = p9_errstr2errno(ename, strlen(ename));
417 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, ename);
427 * p9_client_flush - flush (cancel) a request
429 * @oldreq: request to cancel
431 * This sents a flush for a particular requests and links
432 * the flush request to the original request. The current
433 * code only supports a single flush request although the protocol
434 * allows for multiple flush requests to be sent for a single request.
438 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
440 struct p9_req_t *req;
444 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
448 P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
450 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
455 /* if we haven't received a response for oldreq,
456 remove it from the list. */
458 if (oldreq->status == REQ_STATUS_FLSH)
459 list_del(&oldreq->req_list);
460 spin_unlock(&c->lock);
467 * p9_client_rpc - issue a request and wait for a response
469 * @type: type of request
470 * @fmt: protocol format string (see protocol.c)
472 * Returns request structure (which client must free using p9_free_req)
475 static struct p9_req_t *
476 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
480 struct p9_req_t *req;
484 P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
486 if (c->status != Connected)
487 return ERR_PTR(-EIO);
489 if (signal_pending(current)) {
491 clear_thread_flag(TIF_SIGPENDING);
496 if (type != P9_TVERSION) {
497 tag = p9_idpool_get(c->tagpool);
499 return ERR_PTR(-ENOMEM);
502 req = p9_tag_alloc(c, tag);
506 /* marshall the data */
507 p9pdu_prepare(req->tc, tag, type);
509 err = p9pdu_vwritef(req->tc, c->dotu, fmt, ap);
511 p9pdu_finalize(req->tc);
513 err = c->trans_mod->request(c, req);
515 c->status = Disconnected;
519 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
520 err = wait_event_interruptible(*req->wq,
521 req->status >= REQ_STATUS_RCVD);
522 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n",
525 if (req->status == REQ_STATUS_ERROR) {
526 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
530 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
531 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
533 clear_thread_flag(TIF_SIGPENDING);
535 if (c->trans_mod->cancel(c, req))
536 p9_client_flush(c, req);
538 /* if we received the response anyway, don't signal error */
539 if (req->status == REQ_STATUS_RCVD)
544 spin_lock_irqsave(¤t->sighand->siglock, flags);
546 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
552 err = p9_check_errors(c, req);
554 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
559 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
565 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
571 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
572 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
574 return ERR_PTR(-ENOMEM);
576 ret = p9_idpool_get(clnt->fidpool);
583 memset(&fid->qid, 0, sizeof(struct p9_qid));
586 fid->uid = current_fsuid();
590 spin_lock_irqsave(&clnt->lock, flags);
591 list_add(&fid->flist, &clnt->fidlist);
592 spin_unlock_irqrestore(&clnt->lock, flags);
601 static void p9_fid_destroy(struct p9_fid *fid)
603 struct p9_client *clnt;
606 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
608 p9_idpool_put(fid->fid, clnt->fidpool);
609 spin_lock_irqsave(&clnt->lock, flags);
610 list_del(&fid->flist);
611 spin_unlock_irqrestore(&clnt->lock, flags);
615 int p9_client_version(struct p9_client *c)
618 struct p9_req_t *req;
622 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d extended %d\n",
624 req = p9_client_rpc(c, P9_TVERSION, "ds", c->msize,
625 c->dotu ? "9P2000.u" : "9P2000");
629 err = p9pdu_readf(req->rc, c->dotu, "ds", &msize, &version);
631 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
632 p9pdu_dump(1, req->rc);
636 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
637 if (!memcmp(version, "9P2000.u", 8))
639 else if (!memcmp(version, "9P2000", 6))
646 if (msize < c->msize)
655 EXPORT_SYMBOL(p9_client_version);
657 struct p9_client *p9_client_create(const char *dev_name, char *options)
660 struct p9_client *clnt;
663 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
665 return ERR_PTR(-ENOMEM);
667 clnt->trans_mod = NULL;
669 spin_lock_init(&clnt->lock);
670 INIT_LIST_HEAD(&clnt->fidlist);
671 clnt->fidpool = p9_idpool_create();
672 if (IS_ERR(clnt->fidpool)) {
673 err = PTR_ERR(clnt->fidpool);
674 clnt->fidpool = NULL;
680 err = parse_opts(options, clnt);
684 if (!clnt->trans_mod)
685 clnt->trans_mod = v9fs_get_default_trans();
687 if (clnt->trans_mod == NULL) {
688 err = -EPROTONOSUPPORT;
689 P9_DPRINTK(P9_DEBUG_ERROR,
690 "No transport defined or default transport\n");
694 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d dotu %d\n",
695 clnt, clnt->trans_mod, clnt->msize, clnt->dotu);
697 err = clnt->trans_mod->create(clnt, dev_name, options);
701 if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize)
702 clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ;
704 err = p9_client_version(clnt);
711 p9_client_destroy(clnt);
714 EXPORT_SYMBOL(p9_client_create);
716 void p9_client_destroy(struct p9_client *clnt)
718 struct p9_fid *fid, *fidptr;
720 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
723 clnt->trans_mod->close(clnt);
725 v9fs_put_trans(clnt->trans_mod);
727 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist)
731 p9_idpool_destroy(clnt->fidpool);
733 p9_tag_cleanup(clnt);
737 EXPORT_SYMBOL(p9_client_destroy);
739 void p9_client_disconnect(struct p9_client *clnt)
741 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
742 clnt->status = Disconnected;
744 EXPORT_SYMBOL(p9_client_disconnect);
746 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
747 char *uname, u32 n_uname, char *aname)
750 struct p9_req_t *req;
754 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
755 afid ? afid->fid : -1, uname, aname);
758 fid = p9_fid_create(clnt);
765 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
766 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
772 err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid);
774 p9pdu_dump(1, req->rc);
775 p9_free_req(clnt, req);
779 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
781 (unsigned long long)qid.path,
784 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
786 p9_free_req(clnt, req);
794 EXPORT_SYMBOL(p9_client_attach);
797 p9_client_auth(struct p9_client *clnt, char *uname, u32 n_uname, char *aname)
800 struct p9_req_t *req;
804 P9_DPRINTK(P9_DEBUG_9P, ">>> TAUTH uname %s aname %s\n", uname, aname);
807 afid = p9_fid_create(clnt);
814 req = p9_client_rpc(clnt, P9_TAUTH, "dss?d",
815 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
821 err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid);
823 p9pdu_dump(1, req->rc);
824 p9_free_req(clnt, req);
828 P9_DPRINTK(P9_DEBUG_9P, "<<< RAUTH qid %x.%llx.%x\n",
830 (unsigned long long)qid.path,
833 memmove(&afid->qid, &qid, sizeof(struct p9_qid));
834 p9_free_req(clnt, req);
839 p9_fid_destroy(afid);
842 EXPORT_SYMBOL(p9_client_auth);
844 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
848 struct p9_client *clnt;
850 struct p9_qid *wqids;
851 struct p9_req_t *req;
852 int16_t nwqids, count;
857 fid = p9_fid_create(clnt);
864 fid->uid = oldfid->uid;
869 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n",
870 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
872 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
879 err = p9pdu_readf(req->rc, clnt->dotu, "R", &nwqids, &wqids);
881 p9pdu_dump(1, req->rc);
882 p9_free_req(clnt, req);
885 p9_free_req(clnt, req);
887 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
889 if (nwqids != nwname) {
894 for (count = 0; count < nwqids; count++)
895 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
896 count, wqids[count].type,
897 (unsigned long long)wqids[count].path,
898 wqids[count].version);
901 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
903 fid->qid = oldfid->qid;
908 p9_client_clunk(fid);
912 if (fid && (fid != oldfid))
917 EXPORT_SYMBOL(p9_client_walk);
919 int p9_client_open(struct p9_fid *fid, int mode)
922 struct p9_client *clnt;
923 struct p9_req_t *req;
927 P9_DPRINTK(P9_DEBUG_9P, ">>> TOPEN fid %d mode %d\n", fid->fid, mode);
934 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
940 err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit);
942 p9pdu_dump(1, req->rc);
946 P9_DPRINTK(P9_DEBUG_9P, "<<< ROPEN qid %x.%llx.%x iounit %x\n",
948 (unsigned long long)qid.path,
949 qid.version, iounit);
952 fid->iounit = iounit;
955 p9_free_req(clnt, req);
959 EXPORT_SYMBOL(p9_client_open);
961 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
965 struct p9_client *clnt;
966 struct p9_req_t *req;
970 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
971 fid->fid, name, perm, mode);
978 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
985 err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit);
987 p9pdu_dump(1, req->rc);
991 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
993 (unsigned long long)qid.path,
994 qid.version, iounit);
997 fid->iounit = iounit;
1000 p9_free_req(clnt, req);
1004 EXPORT_SYMBOL(p9_client_fcreate);
1006 int p9_client_clunk(struct p9_fid *fid)
1009 struct p9_client *clnt;
1010 struct p9_req_t *req;
1012 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1016 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1022 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1024 p9_free_req(clnt, req);
1025 p9_fid_destroy(fid);
1030 EXPORT_SYMBOL(p9_client_clunk);
1032 int p9_client_remove(struct p9_fid *fid)
1035 struct p9_client *clnt;
1036 struct p9_req_t *req;
1038 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1042 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1048 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1050 p9_free_req(clnt, req);
1051 p9_fid_destroy(fid);
1056 EXPORT_SYMBOL(p9_client_remove);
1059 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1062 int err, rsize, total;
1063 struct p9_client *clnt;
1064 struct p9_req_t *req;
1067 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid,
1068 (long long unsigned) offset, count);
1073 rsize = fid->iounit;
1074 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1075 rsize = clnt->msize - P9_IOHDRSZ;
1080 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize);
1086 err = p9pdu_readf(req->rc, clnt->dotu, "D", &count, &dataptr);
1088 p9pdu_dump(1, req->rc);
1089 goto free_and_error;
1092 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1095 memmove(data, dataptr, count);
1099 err = copy_to_user(udata, dataptr, count);
1102 goto free_and_error;
1106 p9_free_req(clnt, req);
1110 p9_free_req(clnt, req);
1114 EXPORT_SYMBOL(p9_client_read);
1117 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1118 u64 offset, u32 count)
1120 int err, rsize, total;
1121 struct p9_client *clnt;
1122 struct p9_req_t *req;
1124 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1125 fid->fid, (long long unsigned) offset, count);
1130 rsize = fid->iounit;
1131 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1132 rsize = clnt->msize - P9_IOHDRSZ;
1137 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset,
1140 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset,
1147 err = p9pdu_readf(req->rc, clnt->dotu, "d", &count);
1149 p9pdu_dump(1, req->rc);
1150 goto free_and_error;
1153 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1155 p9_free_req(clnt, req);
1159 p9_free_req(clnt, req);
1163 EXPORT_SYMBOL(p9_client_write);
1165 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1168 struct p9_client *clnt;
1169 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1170 struct p9_req_t *req;
1173 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1176 return ERR_PTR(-ENOMEM);
1181 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1187 err = p9pdu_readf(req->rc, clnt->dotu, "wS", &ignored, ret);
1189 p9pdu_dump(1, req->rc);
1190 p9_free_req(clnt, req);
1194 P9_DPRINTK(P9_DEBUG_9P,
1195 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1196 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1197 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1198 "<<< uid=%d gid=%d n_muid=%d\n",
1199 ret->size, ret->type, ret->dev, ret->qid.type,
1200 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1201 ret->atime, ret->mtime, (unsigned long long)ret->length,
1202 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1203 ret->n_uid, ret->n_gid, ret->n_muid);
1205 p9_free_req(clnt, req);
1210 return ERR_PTR(err);
1212 EXPORT_SYMBOL(p9_client_stat);
1214 static int p9_client_statsize(struct p9_wstat *wst, int optional)
1218 /* size[2] type[2] dev[4] qid[13] */
1219 /* mode[4] atime[4] mtime[4] length[8]*/
1220 /* name[s] uid[s] gid[s] muid[s] */
1221 ret = 2+2+4+13+4+4+4+8+2+2+2+2;
1224 ret += strlen(wst->name);
1226 ret += strlen(wst->uid);
1228 ret += strlen(wst->gid);
1230 ret += strlen(wst->muid);
1233 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1235 ret += strlen(wst->extension);
1241 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1244 struct p9_req_t *req;
1245 struct p9_client *clnt;
1249 wst->size = p9_client_statsize(wst, clnt->dotu);
1250 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1251 P9_DPRINTK(P9_DEBUG_9P,
1252 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1253 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1254 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1255 " uid=%d gid=%d n_muid=%d\n",
1256 wst->size, wst->type, wst->dev, wst->qid.type,
1257 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1258 wst->atime, wst->mtime, (unsigned long long)wst->length,
1259 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1260 wst->n_uid, wst->n_gid, wst->n_muid);
1262 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size, wst);
1268 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1270 p9_free_req(clnt, req);
1274 EXPORT_SYMBOL(p9_client_wstat);