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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
28 #include <linux/module.h>
29 #include <linux/errno.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/signal.h>
36 #include <linux/uaccess.h>
37 #include <linux/uio.h>
38 #include <net/9p/9p.h>
39 #include <linux/parser.h>
40 #include <linux/seq_file.h>
41 #include <net/9p/client.h>
42 #include <net/9p/transport.h>
45 #define CREATE_TRACE_POINTS
46 #include <trace/events/9p.h>
49 * Client Option Parsing (code inspired by NFS code)
50 * - a little lazy - parse all client options
61 static const match_table_t tokens = {
62 {Opt_msize, "msize=%u"},
63 {Opt_legacy, "noextend"},
64 {Opt_trans, "trans=%s"},
65 {Opt_version, "version=%s"},
69 inline int p9_is_proto_dotl(struct p9_client *clnt)
71 return clnt->proto_version == p9_proto_2000L;
73 EXPORT_SYMBOL(p9_is_proto_dotl);
75 inline int p9_is_proto_dotu(struct p9_client *clnt)
77 return clnt->proto_version == p9_proto_2000u;
79 EXPORT_SYMBOL(p9_is_proto_dotu);
81 int p9_show_client_options(struct seq_file *m, struct p9_client *clnt)
83 if (clnt->msize != 8192)
84 seq_printf(m, ",msize=%u", clnt->msize);
85 seq_printf(m, ",trans=%s", clnt->trans_mod->name);
87 switch (clnt->proto_version) {
89 seq_puts(m, ",noextend");
92 seq_puts(m, ",version=9p2000.u");
99 if (clnt->trans_mod->show_options)
100 return clnt->trans_mod->show_options(m, clnt);
103 EXPORT_SYMBOL(p9_show_client_options);
106 * Some error codes are taken directly from the server replies,
107 * make sure they are valid.
109 static int safe_errno(int err)
111 if ((err > 0) || (err < -MAX_ERRNO)) {
112 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err);
119 /* Interpret mount option for protocol version */
120 static int get_protocol_version(char *s)
122 int version = -EINVAL;
124 if (!strcmp(s, "9p2000")) {
125 version = p9_proto_legacy;
126 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n");
127 } else if (!strcmp(s, "9p2000.u")) {
128 version = p9_proto_2000u;
129 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
130 } else if (!strcmp(s, "9p2000.L")) {
131 version = p9_proto_2000L;
132 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
134 pr_info("Unknown protocol version %s\n", s);
140 * parse_options - parse mount options into client structure
141 * @opts: options string passed from mount
142 * @clnt: existing v9fs client information
144 * Return 0 upon success, -ERRNO upon failure
147 static int parse_opts(char *opts, struct p9_client *clnt)
149 char *options, *tmp_options;
151 substring_t args[MAX_OPT_ARGS];
156 clnt->proto_version = p9_proto_2000L;
162 tmp_options = kstrdup(opts, GFP_KERNEL);
164 p9_debug(P9_DEBUG_ERROR,
165 "failed to allocate copy of option string\n");
168 options = tmp_options;
170 while ((p = strsep(&options, ",")) != NULL) {
174 token = match_token(p, tokens, args);
177 r = match_int(&args[0], &option);
179 p9_debug(P9_DEBUG_ERROR,
180 "integer field, but no integer?\n");
184 clnt->msize = option;
187 s = match_strdup(&args[0]);
190 p9_debug(P9_DEBUG_ERROR,
191 "problem allocating copy of trans arg\n");
192 goto free_and_return;
195 v9fs_put_trans(clnt->trans_mod);
196 clnt->trans_mod = v9fs_get_trans_by_name(s);
197 if (clnt->trans_mod == NULL) {
198 pr_info("Could not find request transport: %s\n",
205 clnt->proto_version = p9_proto_legacy;
208 s = match_strdup(&args[0]);
211 p9_debug(P9_DEBUG_ERROR,
212 "problem allocating copy of version arg\n");
213 goto free_and_return;
215 r = get_protocol_version(s);
219 clnt->proto_version = r;
228 v9fs_put_trans(clnt->trans_mod);
233 static struct p9_fcall *p9_fcall_alloc(int alloc_msize)
236 fc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, GFP_NOFS);
239 fc->capacity = alloc_msize;
240 fc->sdata = (char *) fc + sizeof(struct p9_fcall);
245 * p9_tag_alloc - lookup/allocate a request by tag
246 * @c: client session to lookup tag within
247 * @tag: numeric id for transaction
249 * this is a simple array lookup, but will grow the
250 * request_slots as necessary to accommodate transaction
251 * ids which did not previously have a slot.
253 * this code relies on the client spinlock to manage locks, its
254 * possible we should switch to something else, but I'd rather
255 * stick with something low-overhead for the common case.
259 static struct p9_req_t *
260 p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
264 struct p9_req_t *req;
265 int alloc_msize = min(c->msize, max_size);
267 /* This looks up the original request by tag so we know which
268 * buffer to read the data into */
271 if (tag >= c->max_tag) {
272 spin_lock_irqsave(&c->lock, flags);
273 /* check again since original check was outside of lock */
274 while (tag >= c->max_tag) {
275 row = (tag / P9_ROW_MAXTAG);
276 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
277 sizeof(struct p9_req_t), GFP_ATOMIC);
280 pr_err("Couldn't grow tag array\n");
281 spin_unlock_irqrestore(&c->lock, flags);
282 return ERR_PTR(-ENOMEM);
284 for (col = 0; col < P9_ROW_MAXTAG; col++) {
285 c->reqs[row][col].status = REQ_STATUS_IDLE;
286 c->reqs[row][col].tc = NULL;
288 c->max_tag += P9_ROW_MAXTAG;
290 spin_unlock_irqrestore(&c->lock, flags);
292 row = tag / P9_ROW_MAXTAG;
293 col = tag % P9_ROW_MAXTAG;
295 req = &c->reqs[row][col];
297 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
300 init_waitqueue_head(req->wq);
304 req->tc = p9_fcall_alloc(alloc_msize);
306 req->rc = p9_fcall_alloc(alloc_msize);
307 if (!req->tc || !req->rc)
310 p9pdu_reset(req->tc);
311 p9pdu_reset(req->rc);
313 req->tc->tag = tag-1;
314 req->status = REQ_STATUS_ALLOC;
319 pr_err("Couldn't grow tag array\n");
323 req->tc = req->rc = NULL;
325 return ERR_PTR(-ENOMEM);
329 * p9_tag_lookup - lookup a request by tag
330 * @c: client session to lookup tag within
331 * @tag: numeric id for transaction
335 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
339 /* This looks up the original request by tag so we know which
340 * buffer to read the data into */
343 if(tag >= c->max_tag)
346 row = tag / P9_ROW_MAXTAG;
347 col = tag % P9_ROW_MAXTAG;
349 return &c->reqs[row][col];
351 EXPORT_SYMBOL(p9_tag_lookup);
354 * p9_tag_init - setup tags structure and contents
355 * @c: v9fs client struct
357 * This initializes the tags structure for each client instance.
361 static int p9_tag_init(struct p9_client *c)
365 c->tagpool = p9_idpool_create();
366 if (IS_ERR(c->tagpool)) {
367 err = PTR_ERR(c->tagpool);
370 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
372 p9_idpool_destroy(c->tagpool);
381 * p9_tag_cleanup - cleans up tags structure and reclaims resources
382 * @c: v9fs client struct
384 * This frees resources associated with the tags structure
387 static void p9_tag_cleanup(struct p9_client *c)
391 /* check to insure all requests are idle */
392 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
393 for (col = 0; col < P9_ROW_MAXTAG; col++) {
394 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
395 p9_debug(P9_DEBUG_MUX,
396 "Attempting to cleanup non-free tag %d,%d\n",
398 /* TODO: delay execution of cleanup */
405 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
406 p9_idpool_destroy(c->tagpool);
409 /* free requests associated with tags */
410 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
411 for (col = 0; col < P9_ROW_MAXTAG; col++) {
412 kfree(c->reqs[row][col].wq);
413 kfree(c->reqs[row][col].tc);
414 kfree(c->reqs[row][col].rc);
422 * p9_free_req - free a request and clean-up as necessary
424 * r: request to release
428 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
430 int tag = r->tc->tag;
431 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
433 r->status = REQ_STATUS_IDLE;
434 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
435 p9_idpool_put(tag, c->tagpool);
439 * p9_client_cb - call back from transport to client
441 * req: request received
444 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
446 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
449 * This barrier is needed to make sure any change made to req before
450 * the other thread wakes up will indeed be seen by the waiting side.
453 req->status = status;
456 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
458 EXPORT_SYMBOL(p9_client_cb);
461 * p9_parse_header - parse header arguments out of a packet
462 * @pdu: packet to parse
463 * @size: size of packet
464 * @type: type of request
465 * @tag: tag of packet
466 * @rewind: set if we need to rewind offset afterwards
470 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
476 int offset = pdu->offset;
483 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
485 goto rewind_and_exit;
491 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
492 pdu->size, pdu->id, pdu->tag);
504 pdu->offset = offset;
507 EXPORT_SYMBOL(p9_parse_header);
510 * p9_check_errors - check 9p packet for error return and process it
511 * @c: current client instance
512 * @req: request to parse and check for error conditions
514 * returns error code if one is discovered, otherwise returns 0
516 * this will have to be more complicated if we have multiple
520 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
526 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
528 * dump the response from server
529 * This should be after check errors which poplulate pdu_fcall.
531 trace_9p_protocol_dump(c, req->rc);
533 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
536 if (type != P9_RERROR && type != P9_RLERROR)
539 if (!p9_is_proto_dotl(c)) {
541 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
546 if (p9_is_proto_dotu(c) && ecode < 512)
550 err = p9_errstr2errno(ename, strlen(ename));
552 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
557 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
560 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
566 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
572 * p9_check_zc_errors - check 9p packet for error return and process it
573 * @c: current client instance
574 * @req: request to parse and check for error conditions
575 * @in_hdrlen: Size of response protocol buffer.
577 * returns error code if one is discovered, otherwise returns 0
579 * this will have to be more complicated if we have multiple
583 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
584 struct iov_iter *uidata, int in_hdrlen)
591 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
593 * dump the response from server
594 * This should be after parse_header which poplulate pdu_fcall.
596 trace_9p_protocol_dump(c, req->rc);
598 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
602 if (type != P9_RERROR && type != P9_RLERROR)
605 if (!p9_is_proto_dotl(c)) {
606 /* Error is reported in string format */
608 /* 7 = header size for RERROR; */
609 int inline_len = in_hdrlen - 7;
611 len = req->rc->size - req->rc->offset;
612 if (len > (P9_ZC_HDR_SZ - 7)) {
617 ename = &req->rc->sdata[req->rc->offset];
618 if (len > inline_len) {
619 /* We have error in external buffer */
620 if (!copy_from_iter_full(ename + inline_len,
621 len - inline_len, uidata)) {
627 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
632 if (p9_is_proto_dotu(c) && ecode < 512)
636 err = p9_errstr2errno(ename, strlen(ename));
638 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
643 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
646 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
651 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
655 static struct p9_req_t *
656 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
659 * p9_client_flush - flush (cancel) a request
661 * @oldreq: request to cancel
663 * This sents a flush for a particular request and links
664 * the flush request to the original request. The current
665 * code only supports a single flush request although the protocol
666 * allows for multiple flush requests to be sent for a single request.
670 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
672 struct p9_req_t *req;
676 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
680 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
682 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
687 * if we haven't received a response for oldreq,
688 * remove it from the list
690 if (oldreq->status == REQ_STATUS_SENT)
691 if (c->trans_mod->cancelled)
692 c->trans_mod->cancelled(c, oldreq);
698 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
699 int8_t type, int req_size,
700 const char *fmt, va_list ap)
703 struct p9_req_t *req;
705 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
707 /* we allow for any status other than disconnected */
708 if (c->status == Disconnected)
709 return ERR_PTR(-EIO);
711 /* if status is begin_disconnected we allow only clunk request */
712 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
713 return ERR_PTR(-EIO);
716 if (type != P9_TVERSION) {
717 tag = p9_idpool_get(c->tagpool);
719 return ERR_PTR(-ENOMEM);
722 req = p9_tag_alloc(c, tag, req_size);
726 /* marshall the data */
727 p9pdu_prepare(req->tc, tag, type);
728 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
731 p9pdu_finalize(c, req->tc);
732 trace_9p_client_req(c, type, tag);
740 * p9_client_rpc - issue a request and wait for a response
742 * @type: type of request
743 * @fmt: protocol format string (see protocol.c)
745 * Returns request structure (which client must free using p9_free_req)
748 static struct p9_req_t *
749 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
754 struct p9_req_t *req;
757 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
762 if (signal_pending(current)) {
764 clear_thread_flag(TIF_SIGPENDING);
768 err = c->trans_mod->request(c, req);
770 if (err != -ERESTARTSYS && err != -EFAULT)
771 c->status = Disconnected;
772 goto recalc_sigpending;
775 /* Wait for the response */
776 err = wait_event_killable(*req->wq, req->status >= REQ_STATUS_RCVD);
779 * Make sure our req is coherent with regard to updates in other
780 * threads - echoes to wmb() in the callback
784 if ((err == -ERESTARTSYS) && (c->status == Connected)
785 && (type == P9_TFLUSH)) {
787 clear_thread_flag(TIF_SIGPENDING);
791 if (req->status == REQ_STATUS_ERROR) {
792 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
795 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
796 p9_debug(P9_DEBUG_MUX, "flushing\n");
798 clear_thread_flag(TIF_SIGPENDING);
800 if (c->trans_mod->cancel(c, req))
801 p9_client_flush(c, req);
803 /* if we received the response anyway, don't signal error */
804 if (req->status == REQ_STATUS_RCVD)
809 spin_lock_irqsave(¤t->sighand->siglock, flags);
811 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
816 err = p9_check_errors(c, req);
817 trace_9p_client_res(c, type, req->rc->tag, err);
822 return ERR_PTR(safe_errno(err));
826 * p9_client_zc_rpc - issue a request and wait for a response
828 * @type: type of request
829 * @uidata: destination for zero copy read
830 * @uodata: source for zero copy write
831 * @inlen: read buffer size
832 * @olen: write buffer size
833 * @hdrlen: reader header size, This is the size of response protocol data
834 * @fmt: protocol format string (see protocol.c)
836 * Returns request structure (which client must free using p9_free_req)
838 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
839 struct iov_iter *uidata,
840 struct iov_iter *uodata,
841 int inlen, int olen, int in_hdrlen,
842 const char *fmt, ...)
847 struct p9_req_t *req;
851 * We allocate a inline protocol data of only 4k bytes.
852 * The actual content is passed in zero-copy fashion.
854 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
859 if (signal_pending(current)) {
861 clear_thread_flag(TIF_SIGPENDING);
865 err = c->trans_mod->zc_request(c, req, uidata, uodata,
866 inlen, olen, in_hdrlen);
869 c->status = Disconnected;
870 if (err != -ERESTARTSYS)
871 goto recalc_sigpending;
873 if (req->status == REQ_STATUS_ERROR) {
874 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
877 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
878 p9_debug(P9_DEBUG_MUX, "flushing\n");
880 clear_thread_flag(TIF_SIGPENDING);
882 if (c->trans_mod->cancel(c, req))
883 p9_client_flush(c, req);
885 /* if we received the response anyway, don't signal error */
886 if (req->status == REQ_STATUS_RCVD)
891 spin_lock_irqsave(¤t->sighand->siglock, flags);
893 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
898 err = p9_check_zc_errors(c, req, uidata, in_hdrlen);
899 trace_9p_client_res(c, type, req->rc->tag, err);
904 return ERR_PTR(safe_errno(err));
907 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
913 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
914 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
916 return ERR_PTR(-ENOMEM);
918 ret = p9_idpool_get(clnt->fidpool);
925 memset(&fid->qid, 0, sizeof(struct p9_qid));
927 fid->uid = current_fsuid();
930 spin_lock_irqsave(&clnt->lock, flags);
931 list_add(&fid->flist, &clnt->fidlist);
932 spin_unlock_irqrestore(&clnt->lock, flags);
941 static void p9_fid_destroy(struct p9_fid *fid)
943 struct p9_client *clnt;
946 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
948 p9_idpool_put(fid->fid, clnt->fidpool);
949 spin_lock_irqsave(&clnt->lock, flags);
950 list_del(&fid->flist);
951 spin_unlock_irqrestore(&clnt->lock, flags);
956 static int p9_client_version(struct p9_client *c)
959 struct p9_req_t *req;
963 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
964 c->msize, c->proto_version);
966 switch (c->proto_version) {
968 req = p9_client_rpc(c, P9_TVERSION, "ds",
969 c->msize, "9P2000.L");
972 req = p9_client_rpc(c, P9_TVERSION, "ds",
973 c->msize, "9P2000.u");
975 case p9_proto_legacy:
976 req = p9_client_rpc(c, P9_TVERSION, "ds",
986 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
988 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
989 trace_9p_protocol_dump(c, req->rc);
993 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
994 if (!strncmp(version, "9P2000.L", 8))
995 c->proto_version = p9_proto_2000L;
996 else if (!strncmp(version, "9P2000.u", 8))
997 c->proto_version = p9_proto_2000u;
998 else if (!strncmp(version, "9P2000", 6))
999 c->proto_version = p9_proto_legacy;
1005 if (msize < c->msize)
1010 p9_free_req(c, req);
1015 struct p9_client *p9_client_create(const char *dev_name, char *options)
1018 struct p9_client *clnt;
1022 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
1024 return ERR_PTR(-ENOMEM);
1026 clnt->trans_mod = NULL;
1029 client_id = utsname()->nodename;
1030 memcpy(clnt->name, client_id, strlen(client_id) + 1);
1032 spin_lock_init(&clnt->lock);
1033 INIT_LIST_HEAD(&clnt->fidlist);
1035 err = p9_tag_init(clnt);
1039 err = parse_opts(options, clnt);
1041 goto destroy_tagpool;
1043 if (!clnt->trans_mod)
1044 clnt->trans_mod = v9fs_get_default_trans();
1046 if (clnt->trans_mod == NULL) {
1047 err = -EPROTONOSUPPORT;
1048 p9_debug(P9_DEBUG_ERROR,
1049 "No transport defined or default transport\n");
1050 goto destroy_tagpool;
1053 clnt->fidpool = p9_idpool_create();
1054 if (IS_ERR(clnt->fidpool)) {
1055 err = PTR_ERR(clnt->fidpool);
1059 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1060 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1062 err = clnt->trans_mod->create(clnt, dev_name, options);
1064 goto destroy_fidpool;
1066 if (clnt->msize > clnt->trans_mod->maxsize)
1067 clnt->msize = clnt->trans_mod->maxsize;
1069 err = p9_client_version(clnt);
1076 clnt->trans_mod->close(clnt);
1078 p9_idpool_destroy(clnt->fidpool);
1080 v9fs_put_trans(clnt->trans_mod);
1082 p9_idpool_destroy(clnt->tagpool);
1085 return ERR_PTR(err);
1087 EXPORT_SYMBOL(p9_client_create);
1089 void p9_client_destroy(struct p9_client *clnt)
1091 struct p9_fid *fid, *fidptr;
1093 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1095 if (clnt->trans_mod)
1096 clnt->trans_mod->close(clnt);
1098 v9fs_put_trans(clnt->trans_mod);
1100 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1101 pr_info("Found fid %d not clunked\n", fid->fid);
1102 p9_fid_destroy(fid);
1106 p9_idpool_destroy(clnt->fidpool);
1108 p9_tag_cleanup(clnt);
1112 EXPORT_SYMBOL(p9_client_destroy);
1114 void p9_client_disconnect(struct p9_client *clnt)
1116 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1117 clnt->status = Disconnected;
1119 EXPORT_SYMBOL(p9_client_disconnect);
1121 void p9_client_begin_disconnect(struct p9_client *clnt)
1123 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1124 clnt->status = BeginDisconnect;
1126 EXPORT_SYMBOL(p9_client_begin_disconnect);
1128 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1129 const char *uname, kuid_t n_uname, const char *aname)
1132 struct p9_req_t *req;
1137 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1138 afid ? afid->fid : -1, uname, aname);
1139 fid = p9_fid_create(clnt);
1147 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1148 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1154 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1156 trace_9p_protocol_dump(clnt, req->rc);
1157 p9_free_req(clnt, req);
1161 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1162 qid.type, (unsigned long long)qid.path, qid.version);
1164 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1166 p9_free_req(clnt, req);
1171 p9_fid_destroy(fid);
1172 return ERR_PTR(err);
1174 EXPORT_SYMBOL(p9_client_attach);
1176 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1177 const unsigned char * const *wnames, int clone)
1180 struct p9_client *clnt;
1182 struct p9_qid *wqids;
1183 struct p9_req_t *req;
1184 uint16_t nwqids, count;
1188 clnt = oldfid->clnt;
1190 fid = p9_fid_create(clnt);
1197 fid->uid = oldfid->uid;
1202 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1203 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1205 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1212 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1214 trace_9p_protocol_dump(clnt, req->rc);
1215 p9_free_req(clnt, req);
1218 p9_free_req(clnt, req);
1220 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1222 if (nwqids != nwname) {
1227 for (count = 0; count < nwqids; count++)
1228 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1229 count, wqids[count].type,
1230 (unsigned long long)wqids[count].path,
1231 wqids[count].version);
1234 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1236 fid->qid = oldfid->qid;
1243 p9_client_clunk(fid);
1247 if (fid && (fid != oldfid))
1248 p9_fid_destroy(fid);
1250 return ERR_PTR(err);
1252 EXPORT_SYMBOL(p9_client_walk);
1254 int p9_client_open(struct p9_fid *fid, int mode)
1257 struct p9_client *clnt;
1258 struct p9_req_t *req;
1263 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1264 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1267 if (fid->mode != -1)
1270 if (p9_is_proto_dotl(clnt))
1271 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1273 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1279 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1281 trace_9p_protocol_dump(clnt, req->rc);
1282 goto free_and_error;
1285 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1286 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1287 (unsigned long long)qid.path, qid.version, iounit);
1290 fid->iounit = iounit;
1293 p9_free_req(clnt, req);
1297 EXPORT_SYMBOL(p9_client_open);
1299 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode,
1300 kgid_t gid, struct p9_qid *qid)
1303 struct p9_client *clnt;
1304 struct p9_req_t *req;
1307 p9_debug(P9_DEBUG_9P,
1308 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1309 ofid->fid, name, flags, mode,
1310 from_kgid(&init_user_ns, gid));
1313 if (ofid->mode != -1)
1316 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1323 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1325 trace_9p_protocol_dump(clnt, req->rc);
1326 goto free_and_error;
1329 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1331 (unsigned long long)qid->path,
1332 qid->version, iounit);
1335 ofid->iounit = iounit;
1338 p9_free_req(clnt, req);
1342 EXPORT_SYMBOL(p9_client_create_dotl);
1344 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode,
1348 struct p9_client *clnt;
1349 struct p9_req_t *req;
1353 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1354 fid->fid, name, perm, mode);
1358 if (fid->mode != -1)
1361 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1368 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1370 trace_9p_protocol_dump(clnt, req->rc);
1371 goto free_and_error;
1374 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1376 (unsigned long long)qid.path,
1377 qid.version, iounit);
1380 fid->iounit = iounit;
1383 p9_free_req(clnt, req);
1387 EXPORT_SYMBOL(p9_client_fcreate);
1389 int p9_client_symlink(struct p9_fid *dfid, const char *name,
1390 const char *symtgt, kgid_t gid, struct p9_qid *qid)
1393 struct p9_client *clnt;
1394 struct p9_req_t *req;
1396 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1397 dfid->fid, name, symtgt);
1400 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1407 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1409 trace_9p_protocol_dump(clnt, req->rc);
1410 goto free_and_error;
1413 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1414 qid->type, (unsigned long long)qid->path, qid->version);
1417 p9_free_req(clnt, req);
1421 EXPORT_SYMBOL(p9_client_symlink);
1423 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname)
1425 struct p9_client *clnt;
1426 struct p9_req_t *req;
1428 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1429 dfid->fid, oldfid->fid, newname);
1431 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1434 return PTR_ERR(req);
1436 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1437 p9_free_req(clnt, req);
1440 EXPORT_SYMBOL(p9_client_link);
1442 int p9_client_fsync(struct p9_fid *fid, int datasync)
1445 struct p9_client *clnt;
1446 struct p9_req_t *req;
1448 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1449 fid->fid, datasync);
1453 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1459 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1461 p9_free_req(clnt, req);
1466 EXPORT_SYMBOL(p9_client_fsync);
1468 int p9_client_clunk(struct p9_fid *fid)
1471 struct p9_client *clnt;
1472 struct p9_req_t *req;
1476 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1477 __func__, task_pid_nr(current));
1483 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1488 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1494 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1496 p9_free_req(clnt, req);
1499 * Fid is not valid even after a failed clunk
1500 * If interrupted, retry once then give up and
1501 * leak fid until umount.
1503 if (err == -ERESTARTSYS) {
1507 p9_fid_destroy(fid);
1510 EXPORT_SYMBOL(p9_client_clunk);
1512 int p9_client_remove(struct p9_fid *fid)
1515 struct p9_client *clnt;
1516 struct p9_req_t *req;
1518 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1522 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1528 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1530 p9_free_req(clnt, req);
1532 if (err == -ERESTARTSYS)
1533 p9_client_clunk(fid);
1535 p9_fid_destroy(fid);
1538 EXPORT_SYMBOL(p9_client_remove);
1540 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1543 struct p9_req_t *req;
1544 struct p9_client *clnt;
1546 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1547 dfid->fid, name, flags);
1550 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1555 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1557 p9_free_req(clnt, req);
1561 EXPORT_SYMBOL(p9_client_unlinkat);
1564 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
1566 struct p9_client *clnt = fid->clnt;
1567 struct p9_req_t *req;
1571 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1572 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to));
1574 while (iov_iter_count(to)) {
1575 int count = iov_iter_count(to);
1576 int rsize, non_zc = 0;
1579 rsize = fid->iounit;
1580 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1581 rsize = clnt->msize - P9_IOHDRSZ;
1586 /* Don't bother zerocopy for small IO (< 1024) */
1587 if (clnt->trans_mod->zc_request && rsize > 1024) {
1589 * response header len is 11
1590 * PDU Header(7) + IO Size (4)
1592 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize,
1593 0, 11, "dqd", fid->fid,
1597 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1601 *err = PTR_ERR(req);
1605 *err = p9pdu_readf(req->rc, clnt->proto_version,
1606 "D", &count, &dataptr);
1608 trace_9p_protocol_dump(clnt, req->rc);
1609 p9_free_req(clnt, req);
1612 if (rsize < count) {
1613 pr_err("bogus RREAD count (%d > %d)\n", count, rsize);
1617 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1619 p9_free_req(clnt, req);
1624 int n = copy_to_iter(dataptr, count, to);
1629 p9_free_req(clnt, req);
1633 iov_iter_advance(to, count);
1637 p9_free_req(clnt, req);
1641 EXPORT_SYMBOL(p9_client_read);
1644 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
1646 struct p9_client *clnt = fid->clnt;
1647 struct p9_req_t *req;
1651 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n",
1652 fid->fid, (unsigned long long) offset,
1653 iov_iter_count(from));
1655 while (iov_iter_count(from)) {
1656 int count = iov_iter_count(from);
1657 int rsize = fid->iounit;
1658 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1659 rsize = clnt->msize - P9_IOHDRSZ;
1664 /* Don't bother zerocopy for small IO (< 1024) */
1665 if (clnt->trans_mod->zc_request && rsize > 1024) {
1666 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
1667 rsize, P9_ZC_HDR_SZ, "dqd",
1668 fid->fid, offset, rsize);
1670 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
1671 offset, rsize, from);
1674 *err = PTR_ERR(req);
1678 *err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1680 trace_9p_protocol_dump(clnt, req->rc);
1681 p9_free_req(clnt, req);
1684 if (rsize < count) {
1685 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize);
1689 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1691 p9_free_req(clnt, req);
1692 iov_iter_advance(from, count);
1698 EXPORT_SYMBOL(p9_client_write);
1700 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1703 struct p9_client *clnt;
1704 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1705 struct p9_req_t *req;
1708 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1711 return ERR_PTR(-ENOMEM);
1716 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1722 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1724 trace_9p_protocol_dump(clnt, req->rc);
1725 p9_free_req(clnt, req);
1729 p9_debug(P9_DEBUG_9P,
1730 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1731 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1732 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1733 "<<< uid=%d gid=%d n_muid=%d\n",
1734 ret->size, ret->type, ret->dev, ret->qid.type,
1735 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1736 ret->atime, ret->mtime, (unsigned long long)ret->length,
1737 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1738 from_kuid(&init_user_ns, ret->n_uid),
1739 from_kgid(&init_user_ns, ret->n_gid),
1740 from_kuid(&init_user_ns, ret->n_muid));
1742 p9_free_req(clnt, req);
1747 return ERR_PTR(err);
1749 EXPORT_SYMBOL(p9_client_stat);
1751 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1755 struct p9_client *clnt;
1756 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1758 struct p9_req_t *req;
1760 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1761 fid->fid, request_mask);
1764 return ERR_PTR(-ENOMEM);
1769 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1775 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1777 trace_9p_protocol_dump(clnt, req->rc);
1778 p9_free_req(clnt, req);
1782 p9_debug(P9_DEBUG_9P,
1783 "<<< RGETATTR st_result_mask=%lld\n"
1784 "<<< qid=%x.%llx.%x\n"
1785 "<<< st_mode=%8.8x st_nlink=%llu\n"
1786 "<<< st_uid=%d st_gid=%d\n"
1787 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1788 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1789 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1790 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1791 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1792 "<<< st_gen=%lld st_data_version=%lld",
1793 ret->st_result_mask, ret->qid.type, ret->qid.path,
1794 ret->qid.version, ret->st_mode, ret->st_nlink,
1795 from_kuid(&init_user_ns, ret->st_uid),
1796 from_kgid(&init_user_ns, ret->st_gid),
1797 ret->st_rdev, ret->st_size, ret->st_blksize,
1798 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1799 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1800 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1801 ret->st_gen, ret->st_data_version);
1803 p9_free_req(clnt, req);
1808 return ERR_PTR(err);
1810 EXPORT_SYMBOL(p9_client_getattr_dotl);
1812 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1816 /* NOTE: size shouldn't include its own length */
1817 /* size[2] type[2] dev[4] qid[13] */
1818 /* mode[4] atime[4] mtime[4] length[8]*/
1819 /* name[s] uid[s] gid[s] muid[s] */
1820 ret = 2+4+13+4+4+4+8+2+2+2+2;
1823 ret += strlen(wst->name);
1825 ret += strlen(wst->uid);
1827 ret += strlen(wst->gid);
1829 ret += strlen(wst->muid);
1831 if ((proto_version == p9_proto_2000u) ||
1832 (proto_version == p9_proto_2000L)) {
1833 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1835 ret += strlen(wst->extension);
1841 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1844 struct p9_req_t *req;
1845 struct p9_client *clnt;
1849 wst->size = p9_client_statsize(wst, clnt->proto_version);
1850 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1851 p9_debug(P9_DEBUG_9P,
1852 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1853 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1854 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1855 " uid=%d gid=%d n_muid=%d\n",
1856 wst->size, wst->type, wst->dev, wst->qid.type,
1857 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1858 wst->atime, wst->mtime, (unsigned long long)wst->length,
1859 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1860 from_kuid(&init_user_ns, wst->n_uid),
1861 from_kgid(&init_user_ns, wst->n_gid),
1862 from_kuid(&init_user_ns, wst->n_muid));
1864 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1870 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1872 p9_free_req(clnt, req);
1876 EXPORT_SYMBOL(p9_client_wstat);
1878 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1881 struct p9_req_t *req;
1882 struct p9_client *clnt;
1886 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1887 p9_debug(P9_DEBUG_9P,
1888 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1889 " atime_sec=%lld atime_nsec=%lld\n"
1890 " mtime_sec=%lld mtime_nsec=%lld\n",
1891 p9attr->valid, p9attr->mode,
1892 from_kuid(&init_user_ns, p9attr->uid),
1893 from_kgid(&init_user_ns, p9attr->gid),
1894 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1895 p9attr->mtime_sec, p9attr->mtime_nsec);
1897 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1903 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1904 p9_free_req(clnt, req);
1908 EXPORT_SYMBOL(p9_client_setattr);
1910 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1913 struct p9_req_t *req;
1914 struct p9_client *clnt;
1919 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1921 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1927 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1928 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1929 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1931 trace_9p_protocol_dump(clnt, req->rc);
1932 p9_free_req(clnt, req);
1936 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1937 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1938 "fsid %llu namelen %ld\n",
1939 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1940 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1941 sb->fsid, (long int)sb->namelen);
1943 p9_free_req(clnt, req);
1947 EXPORT_SYMBOL(p9_client_statfs);
1949 int p9_client_rename(struct p9_fid *fid,
1950 struct p9_fid *newdirfid, const char *name)
1953 struct p9_req_t *req;
1954 struct p9_client *clnt;
1959 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1960 fid->fid, newdirfid->fid, name);
1962 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1963 newdirfid->fid, name);
1969 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1971 p9_free_req(clnt, req);
1975 EXPORT_SYMBOL(p9_client_rename);
1977 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1978 struct p9_fid *newdirfid, const char *new_name)
1981 struct p9_req_t *req;
1982 struct p9_client *clnt;
1985 clnt = olddirfid->clnt;
1987 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1988 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1989 newdirfid->fid, new_name);
1991 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1992 old_name, newdirfid->fid, new_name);
1998 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1999 newdirfid->fid, new_name);
2001 p9_free_req(clnt, req);
2005 EXPORT_SYMBOL(p9_client_renameat);
2008 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
2010 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
2011 const char *attr_name, u64 *attr_size)
2014 struct p9_req_t *req;
2015 struct p9_client *clnt;
2016 struct p9_fid *attr_fid;
2019 clnt = file_fid->clnt;
2020 attr_fid = p9_fid_create(clnt);
2021 if (IS_ERR(attr_fid)) {
2022 err = PTR_ERR(attr_fid);
2026 p9_debug(P9_DEBUG_9P,
2027 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2028 file_fid->fid, attr_fid->fid, attr_name);
2030 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2031 file_fid->fid, attr_fid->fid, attr_name);
2036 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
2038 trace_9p_protocol_dump(clnt, req->rc);
2039 p9_free_req(clnt, req);
2042 p9_free_req(clnt, req);
2043 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2044 attr_fid->fid, *attr_size);
2047 p9_client_clunk(attr_fid);
2050 if (attr_fid && (attr_fid != file_fid))
2051 p9_fid_destroy(attr_fid);
2053 return ERR_PTR(err);
2055 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2057 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2058 u64 attr_size, int flags)
2061 struct p9_req_t *req;
2062 struct p9_client *clnt;
2064 p9_debug(P9_DEBUG_9P,
2065 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2066 fid->fid, name, (long long)attr_size, flags);
2069 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2070 fid->fid, name, attr_size, flags);
2075 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2076 p9_free_req(clnt, req);
2080 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2082 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2084 int err, rsize, non_zc = 0;
2085 struct p9_client *clnt;
2086 struct p9_req_t *req;
2088 struct kvec kv = {.iov_base = data, .iov_len = count};
2091 iov_iter_kvec(&to, READ | ITER_KVEC, &kv, 1, count);
2093 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2094 fid->fid, (unsigned long long) offset, count);
2099 rsize = fid->iounit;
2100 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2101 rsize = clnt->msize - P9_READDIRHDRSZ;
2106 /* Don't bother zerocopy for small IO (< 1024) */
2107 if (clnt->trans_mod->zc_request && rsize > 1024) {
2109 * response header len is 11
2110 * PDU Header(7) + IO Size (4)
2112 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0,
2113 11, "dqd", fid->fid, offset, rsize);
2116 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2124 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2126 trace_9p_protocol_dump(clnt, req->rc);
2127 goto free_and_error;
2129 if (rsize < count) {
2130 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize);
2134 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2137 memmove(data, dataptr, count);
2139 p9_free_req(clnt, req);
2143 p9_free_req(clnt, req);
2147 EXPORT_SYMBOL(p9_client_readdir);
2149 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode,
2150 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2153 struct p9_client *clnt;
2154 struct p9_req_t *req;
2158 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2159 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2160 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2161 MAJOR(rdev), MINOR(rdev), gid);
2163 return PTR_ERR(req);
2165 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2167 trace_9p_protocol_dump(clnt, req->rc);
2170 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2171 (unsigned long long)qid->path, qid->version);
2174 p9_free_req(clnt, req);
2178 EXPORT_SYMBOL(p9_client_mknod_dotl);
2180 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode,
2181 kgid_t gid, struct p9_qid *qid)
2184 struct p9_client *clnt;
2185 struct p9_req_t *req;
2189 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2190 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2191 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
2194 return PTR_ERR(req);
2196 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2198 trace_9p_protocol_dump(clnt, req->rc);
2201 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2202 (unsigned long long)qid->path, qid->version);
2205 p9_free_req(clnt, req);
2209 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2211 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2214 struct p9_client *clnt;
2215 struct p9_req_t *req;
2219 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2220 "start %lld length %lld proc_id %d client_id %s\n",
2221 fid->fid, flock->type, flock->flags, flock->start,
2222 flock->length, flock->proc_id, flock->client_id);
2224 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2225 flock->flags, flock->start, flock->length,
2226 flock->proc_id, flock->client_id);
2229 return PTR_ERR(req);
2231 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2233 trace_9p_protocol_dump(clnt, req->rc);
2236 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2238 p9_free_req(clnt, req);
2242 EXPORT_SYMBOL(p9_client_lock_dotl);
2244 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2247 struct p9_client *clnt;
2248 struct p9_req_t *req;
2252 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2253 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2254 glock->start, glock->length, glock->proc_id, glock->client_id);
2256 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2257 glock->start, glock->length, glock->proc_id, glock->client_id);
2260 return PTR_ERR(req);
2262 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2263 &glock->start, &glock->length, &glock->proc_id,
2266 trace_9p_protocol_dump(clnt, req->rc);
2269 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2270 "proc_id %d client_id %s\n", glock->type, glock->start,
2271 glock->length, glock->proc_id, glock->client_id);
2273 p9_free_req(clnt, req);
2276 EXPORT_SYMBOL(p9_client_getlock_dotl);
2278 int p9_client_readlink(struct p9_fid *fid, char **target)
2281 struct p9_client *clnt;
2282 struct p9_req_t *req;
2286 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2288 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2290 return PTR_ERR(req);
2292 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2294 trace_9p_protocol_dump(clnt, req->rc);
2297 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2299 p9_free_req(clnt, req);
2302 EXPORT_SYMBOL(p9_client_readlink);