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)
72 char *options, *tmp_options;
74 substring_t args[MAX_OPT_ARGS];
84 tmp_options = kstrdup(opts, GFP_KERNEL);
86 P9_DPRINTK(P9_DEBUG_ERROR,
87 "failed to allocate copy of option string\n");
90 options = tmp_options;
92 while ((p = strsep(&options, ",")) != NULL) {
96 token = match_token(p, tokens, args);
97 if (token < Opt_trans) {
98 int r = match_int(&args[0], &option);
100 P9_DPRINTK(P9_DEBUG_ERROR,
101 "integer field, but no integer?\n");
108 clnt->msize = option;
111 clnt->trans_mod = v9fs_get_trans_by_name(&args[0]);
112 if(clnt->trans_mod == NULL) {
113 P9_DPRINTK(P9_DEBUG_ERROR,
114 "Could not find request transport: %s\n",
117 goto free_and_return;
134 * p9_tag_alloc - lookup/allocate a request by tag
135 * @c: client session to lookup tag within
136 * @tag: numeric id for transaction
138 * this is a simple array lookup, but will grow the
139 * request_slots as necessary to accomodate transaction
140 * ids which did not previously have a slot.
142 * this code relies on the client spinlock to manage locks, its
143 * possible we should switch to something else, but I'd rather
144 * stick with something low-overhead for the common case.
148 static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag)
152 struct p9_req_t *req;
154 /* This looks up the original request by tag so we know which
155 * buffer to read the data into */
158 if (tag >= c->max_tag) {
159 spin_lock_irqsave(&c->lock, flags);
160 /* check again since original check was outside of lock */
161 while (tag >= c->max_tag) {
162 row = (tag / P9_ROW_MAXTAG);
163 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
164 sizeof(struct p9_req_t), GFP_ATOMIC);
167 printk(KERN_ERR "Couldn't grow tag array\n");
168 spin_unlock_irqrestore(&c->lock, flags);
169 return ERR_PTR(-ENOMEM);
171 for (col = 0; col < P9_ROW_MAXTAG; col++) {
172 c->reqs[row][col].status = REQ_STATUS_IDLE;
173 c->reqs[row][col].tc = NULL;
175 c->max_tag += P9_ROW_MAXTAG;
177 spin_unlock_irqrestore(&c->lock, flags);
179 row = tag / P9_ROW_MAXTAG;
180 col = tag % P9_ROW_MAXTAG;
182 req = &c->reqs[row][col];
184 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_KERNEL);
186 printk(KERN_ERR "Couldn't grow tag array\n");
187 return ERR_PTR(-ENOMEM);
189 init_waitqueue_head(req->wq);
190 req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize,
192 req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize,
194 if ((!req->tc) || (!req->rc)) {
195 printk(KERN_ERR "Couldn't grow tag array\n");
199 req->tc = req->rc = NULL;
201 return ERR_PTR(-ENOMEM);
203 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
204 req->tc->capacity = c->msize;
205 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
206 req->rc->capacity = c->msize;
209 p9pdu_reset(req->tc);
210 p9pdu_reset(req->rc);
212 req->tc->tag = tag-1;
213 req->status = REQ_STATUS_ALLOC;
215 return &c->reqs[row][col];
219 * p9_tag_lookup - lookup a request by tag
220 * @c: client session to lookup tag within
221 * @tag: numeric id for transaction
225 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
229 /* This looks up the original request by tag so we know which
230 * buffer to read the data into */
233 BUG_ON(tag >= c->max_tag);
235 row = tag / P9_ROW_MAXTAG;
236 col = tag % P9_ROW_MAXTAG;
238 return &c->reqs[row][col];
240 EXPORT_SYMBOL(p9_tag_lookup);
243 * p9_tag_init - setup tags structure and contents
244 * @c: v9fs client struct
246 * This initializes the tags structure for each client instance.
250 static int p9_tag_init(struct p9_client *c)
254 c->tagpool = p9_idpool_create();
255 if (IS_ERR(c->tagpool)) {
256 err = PTR_ERR(c->tagpool);
261 p9_idpool_get(c->tagpool); /* reserve tag 0 */
269 * p9_tag_cleanup - cleans up tags structure and reclaims resources
270 * @c: v9fs client struct
272 * This frees resources associated with the tags structure
275 static void p9_tag_cleanup(struct p9_client *c)
279 /* check to insure all requests are idle */
280 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
281 for (col = 0; col < P9_ROW_MAXTAG; col++) {
282 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
283 P9_DPRINTK(P9_DEBUG_MUX,
284 "Attempting to cleanup non-free tag %d,%d\n",
286 /* TODO: delay execution of cleanup */
293 p9_idpool_destroy(c->tagpool);
295 /* free requests associated with tags */
296 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
297 for (col = 0; col < P9_ROW_MAXTAG; col++) {
298 kfree(c->reqs[row][col].wq);
299 kfree(c->reqs[row][col].tc);
300 kfree(c->reqs[row][col].rc);
308 * p9_free_req - free a request and clean-up as necessary
310 * r: request to release
314 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
316 int tag = r->tc->tag;
317 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
319 r->status = REQ_STATUS_IDLE;
320 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
321 p9_idpool_put(tag, c->tagpool);
325 * p9_client_cb - call back from transport to client
327 * req: request received
330 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
332 P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
334 P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
336 EXPORT_SYMBOL(p9_client_cb);
339 * p9_parse_header - parse header arguments out of a packet
340 * @pdu: packet to parse
341 * @size: size of packet
342 * @type: type of request
343 * @tag: tag of packet
344 * @rewind: set if we need to rewind offset afterwards
348 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
354 int offset = pdu->offset;
361 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
363 goto rewind_and_exit;
369 P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size,
382 pdu->offset = offset;
385 EXPORT_SYMBOL(p9_parse_header);
388 * p9_check_errors - check 9p packet for error return and process it
389 * @c: current client instance
390 * @req: request to parse and check for error conditions
392 * returns error code if one is discovered, otherwise returns 0
394 * this will have to be more complicated if we have multiple
398 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
403 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
405 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
409 if (type == P9_RERROR) {
413 err = p9pdu_readf(req->rc, c->dotu, "s?d", &ename, &ecode);
415 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n",
423 if (!err || !IS_ERR_VALUE(err))
424 err = p9_errstr2errno(ename, strlen(ename));
426 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, ename);
436 * p9_client_flush - flush (cancel) a request
438 * @oldreq: request to cancel
440 * This sents a flush for a particular requests and links
441 * the flush request to the original request. The current
442 * code only supports a single flush request although the protocol
443 * allows for multiple flush requests to be sent for a single request.
447 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
449 struct p9_req_t *req;
453 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
457 P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
459 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
464 /* if we haven't received a response for oldreq,
465 remove it from the list. */
467 if (oldreq->status == REQ_STATUS_FLSH)
468 list_del(&oldreq->req_list);
469 spin_unlock(&c->lock);
476 * p9_client_rpc - issue a request and wait for a response
478 * @type: type of request
479 * @fmt: protocol format string (see protocol.c)
481 * Returns request structure (which client must free using p9_free_req)
484 static struct p9_req_t *
485 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
489 struct p9_req_t *req;
493 P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
495 if (c->status != Connected)
496 return ERR_PTR(-EIO);
498 if (signal_pending(current)) {
500 clear_thread_flag(TIF_SIGPENDING);
505 if (type != P9_TVERSION) {
506 tag = p9_idpool_get(c->tagpool);
508 return ERR_PTR(-ENOMEM);
511 req = p9_tag_alloc(c, tag);
515 /* marshall the data */
516 p9pdu_prepare(req->tc, tag, type);
518 err = p9pdu_vwritef(req->tc, c->dotu, fmt, ap);
520 p9pdu_finalize(req->tc);
522 err = c->trans_mod->request(c, req);
524 c->status = Disconnected;
528 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
529 err = wait_event_interruptible(*req->wq,
530 req->status >= REQ_STATUS_RCVD);
531 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n",
534 if (req->status == REQ_STATUS_ERROR) {
535 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
539 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
540 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
542 clear_thread_flag(TIF_SIGPENDING);
544 if (c->trans_mod->cancel(c, req))
545 p9_client_flush(c, req);
547 /* if we received the response anyway, don't signal error */
548 if (req->status == REQ_STATUS_RCVD)
553 spin_lock_irqsave(¤t->sighand->siglock, flags);
555 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
561 err = p9_check_errors(c, req);
563 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
568 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
574 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
580 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
581 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
583 return ERR_PTR(-ENOMEM);
585 ret = p9_idpool_get(clnt->fidpool);
592 memset(&fid->qid, 0, sizeof(struct p9_qid));
594 fid->uid = current_fsuid();
597 spin_lock_irqsave(&clnt->lock, flags);
598 list_add(&fid->flist, &clnt->fidlist);
599 spin_unlock_irqrestore(&clnt->lock, flags);
608 static void p9_fid_destroy(struct p9_fid *fid)
610 struct p9_client *clnt;
613 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
615 p9_idpool_put(fid->fid, clnt->fidpool);
616 spin_lock_irqsave(&clnt->lock, flags);
617 list_del(&fid->flist);
618 spin_unlock_irqrestore(&clnt->lock, flags);
623 int p9_client_version(struct p9_client *c)
626 struct p9_req_t *req;
630 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d extended %d\n",
632 req = p9_client_rpc(c, P9_TVERSION, "ds", c->msize,
633 c->dotu ? "9P2000.u" : "9P2000");
637 err = p9pdu_readf(req->rc, c->dotu, "ds", &msize, &version);
639 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
640 p9pdu_dump(1, req->rc);
644 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
645 if (!memcmp(version, "9P2000.u", 8))
647 else if (!memcmp(version, "9P2000", 6))
654 if (msize < c->msize)
663 EXPORT_SYMBOL(p9_client_version);
665 struct p9_client *p9_client_create(const char *dev_name, char *options)
668 struct p9_client *clnt;
671 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
673 return ERR_PTR(-ENOMEM);
675 clnt->trans_mod = NULL;
677 spin_lock_init(&clnt->lock);
678 INIT_LIST_HEAD(&clnt->fidlist);
682 err = parse_opts(options, clnt);
686 if (!clnt->trans_mod)
687 clnt->trans_mod = v9fs_get_default_trans();
689 if (clnt->trans_mod == NULL) {
690 err = -EPROTONOSUPPORT;
691 P9_DPRINTK(P9_DEBUG_ERROR,
692 "No transport defined or default transport\n");
696 clnt->fidpool = p9_idpool_create();
697 if (IS_ERR(clnt->fidpool)) {
698 err = PTR_ERR(clnt->fidpool);
699 clnt->fidpool = NULL;
703 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d dotu %d\n",
704 clnt, clnt->trans_mod, clnt->msize, clnt->dotu);
706 err = clnt->trans_mod->create(clnt, dev_name, options);
708 goto destroy_fidpool;
710 if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize)
711 clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ;
713 err = p9_client_version(clnt);
720 clnt->trans_mod->close(clnt);
722 p9_idpool_destroy(clnt->fidpool);
724 v9fs_put_trans(clnt->trans_mod);
729 EXPORT_SYMBOL(p9_client_create);
731 void p9_client_destroy(struct p9_client *clnt)
733 struct p9_fid *fid, *fidptr;
735 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
738 clnt->trans_mod->close(clnt);
740 v9fs_put_trans(clnt->trans_mod);
742 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist)
746 p9_idpool_destroy(clnt->fidpool);
748 p9_tag_cleanup(clnt);
752 EXPORT_SYMBOL(p9_client_destroy);
754 void p9_client_disconnect(struct p9_client *clnt)
756 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
757 clnt->status = Disconnected;
759 EXPORT_SYMBOL(p9_client_disconnect);
761 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
762 char *uname, u32 n_uname, char *aname)
765 struct p9_req_t *req;
769 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
770 afid ? afid->fid : -1, uname, aname);
773 fid = p9_fid_create(clnt);
780 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
781 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
787 err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid);
789 p9pdu_dump(1, req->rc);
790 p9_free_req(clnt, req);
794 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
796 (unsigned long long)qid.path,
799 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
801 p9_free_req(clnt, req);
809 EXPORT_SYMBOL(p9_client_attach);
812 p9_client_auth(struct p9_client *clnt, char *uname, u32 n_uname, char *aname)
815 struct p9_req_t *req;
819 P9_DPRINTK(P9_DEBUG_9P, ">>> TAUTH uname %s aname %s\n", uname, aname);
822 afid = p9_fid_create(clnt);
829 req = p9_client_rpc(clnt, P9_TAUTH, "dss?d",
830 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
836 err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid);
838 p9pdu_dump(1, req->rc);
839 p9_free_req(clnt, req);
843 P9_DPRINTK(P9_DEBUG_9P, "<<< RAUTH qid %x.%llx.%x\n",
845 (unsigned long long)qid.path,
848 memmove(&afid->qid, &qid, sizeof(struct p9_qid));
849 p9_free_req(clnt, req);
854 p9_fid_destroy(afid);
857 EXPORT_SYMBOL(p9_client_auth);
859 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
863 struct p9_client *clnt;
865 struct p9_qid *wqids;
866 struct p9_req_t *req;
867 int16_t nwqids, count;
872 fid = p9_fid_create(clnt);
879 fid->uid = oldfid->uid;
884 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n",
885 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
887 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
894 err = p9pdu_readf(req->rc, clnt->dotu, "R", &nwqids, &wqids);
896 p9pdu_dump(1, req->rc);
897 p9_free_req(clnt, req);
900 p9_free_req(clnt, req);
902 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
904 if (nwqids != nwname) {
909 for (count = 0; count < nwqids; count++)
910 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
911 count, wqids[count].type,
912 (unsigned long long)wqids[count].path,
913 wqids[count].version);
916 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
918 fid->qid = oldfid->qid;
923 p9_client_clunk(fid);
927 if (fid && (fid != oldfid))
932 EXPORT_SYMBOL(p9_client_walk);
934 int p9_client_open(struct p9_fid *fid, int mode)
937 struct p9_client *clnt;
938 struct p9_req_t *req;
942 P9_DPRINTK(P9_DEBUG_9P, ">>> TOPEN fid %d mode %d\n", fid->fid, mode);
949 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
955 err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit);
957 p9pdu_dump(1, req->rc);
961 P9_DPRINTK(P9_DEBUG_9P, "<<< ROPEN qid %x.%llx.%x iounit %x\n",
963 (unsigned long long)qid.path,
964 qid.version, iounit);
967 fid->iounit = iounit;
970 p9_free_req(clnt, req);
974 EXPORT_SYMBOL(p9_client_open);
976 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
980 struct p9_client *clnt;
981 struct p9_req_t *req;
985 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
986 fid->fid, name, perm, mode);
993 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1000 err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit);
1002 p9pdu_dump(1, req->rc);
1003 goto free_and_error;
1006 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1008 (unsigned long long)qid.path,
1009 qid.version, iounit);
1012 fid->iounit = iounit;
1015 p9_free_req(clnt, req);
1019 EXPORT_SYMBOL(p9_client_fcreate);
1021 int p9_client_clunk(struct p9_fid *fid)
1024 struct p9_client *clnt;
1025 struct p9_req_t *req;
1027 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1031 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1037 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1039 p9_free_req(clnt, req);
1040 p9_fid_destroy(fid);
1045 EXPORT_SYMBOL(p9_client_clunk);
1047 int p9_client_remove(struct p9_fid *fid)
1050 struct p9_client *clnt;
1051 struct p9_req_t *req;
1053 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1057 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1063 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1065 p9_free_req(clnt, req);
1066 p9_fid_destroy(fid);
1071 EXPORT_SYMBOL(p9_client_remove);
1074 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1077 int err, rsize, total;
1078 struct p9_client *clnt;
1079 struct p9_req_t *req;
1082 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid,
1083 (long long unsigned) offset, count);
1088 rsize = fid->iounit;
1089 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1090 rsize = clnt->msize - P9_IOHDRSZ;
1095 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize);
1101 err = p9pdu_readf(req->rc, clnt->dotu, "D", &count, &dataptr);
1103 p9pdu_dump(1, req->rc);
1104 goto free_and_error;
1107 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1110 memmove(data, dataptr, count);
1114 err = copy_to_user(udata, dataptr, count);
1117 goto free_and_error;
1121 p9_free_req(clnt, req);
1125 p9_free_req(clnt, req);
1129 EXPORT_SYMBOL(p9_client_read);
1132 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1133 u64 offset, u32 count)
1135 int err, rsize, total;
1136 struct p9_client *clnt;
1137 struct p9_req_t *req;
1139 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1140 fid->fid, (long long unsigned) offset, count);
1145 rsize = fid->iounit;
1146 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1147 rsize = clnt->msize - P9_IOHDRSZ;
1152 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset,
1155 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset,
1162 err = p9pdu_readf(req->rc, clnt->dotu, "d", &count);
1164 p9pdu_dump(1, req->rc);
1165 goto free_and_error;
1168 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1170 p9_free_req(clnt, req);
1174 p9_free_req(clnt, req);
1178 EXPORT_SYMBOL(p9_client_write);
1180 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1183 struct p9_client *clnt;
1184 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1185 struct p9_req_t *req;
1188 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1191 return ERR_PTR(-ENOMEM);
1196 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1202 err = p9pdu_readf(req->rc, clnt->dotu, "wS", &ignored, ret);
1204 p9pdu_dump(1, req->rc);
1205 p9_free_req(clnt, req);
1209 P9_DPRINTK(P9_DEBUG_9P,
1210 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1211 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1212 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1213 "<<< uid=%d gid=%d n_muid=%d\n",
1214 ret->size, ret->type, ret->dev, ret->qid.type,
1215 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1216 ret->atime, ret->mtime, (unsigned long long)ret->length,
1217 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1218 ret->n_uid, ret->n_gid, ret->n_muid);
1220 p9_free_req(clnt, req);
1225 return ERR_PTR(err);
1227 EXPORT_SYMBOL(p9_client_stat);
1229 static int p9_client_statsize(struct p9_wstat *wst, int optional)
1233 /* NOTE: size shouldn't include its own length */
1234 /* size[2] type[2] dev[4] qid[13] */
1235 /* mode[4] atime[4] mtime[4] length[8]*/
1236 /* name[s] uid[s] gid[s] muid[s] */
1237 ret = 2+4+13+4+4+4+8+2+2+2+2;
1240 ret += strlen(wst->name);
1242 ret += strlen(wst->uid);
1244 ret += strlen(wst->gid);
1246 ret += strlen(wst->muid);
1249 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1251 ret += strlen(wst->extension);
1257 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1260 struct p9_req_t *req;
1261 struct p9_client *clnt;
1265 wst->size = p9_client_statsize(wst, clnt->dotu);
1266 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1267 P9_DPRINTK(P9_DEBUG_9P,
1268 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1269 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1270 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1271 " uid=%d gid=%d n_muid=%d\n",
1272 wst->size, wst->type, wst->dev, wst->qid.type,
1273 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1274 wst->atime, wst->mtime, (unsigned long long)wst->length,
1275 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1276 wst->n_uid, wst->n_gid, wst->n_muid);
1278 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1284 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1286 p9_free_req(clnt, req);
1290 EXPORT_SYMBOL(p9_client_wstat);