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.h>
36 #include <linux/uaccess.h>
37 #include <linux/uio.h>
38 #include <net/9p/9p.h>
39 #include <linux/parser.h>
40 #include <net/9p/client.h>
41 #include <net/9p/transport.h>
44 #define CREATE_TRACE_POINTS
45 #include <trace/events/9p.h>
48 * Client Option Parsing (code inspired by NFS code)
49 * - a little lazy - parse all client options
60 static const match_table_t tokens = {
61 {Opt_msize, "msize=%u"},
62 {Opt_legacy, "noextend"},
63 {Opt_trans, "trans=%s"},
64 {Opt_version, "version=%s"},
68 inline int p9_is_proto_dotl(struct p9_client *clnt)
70 return clnt->proto_version == p9_proto_2000L;
72 EXPORT_SYMBOL(p9_is_proto_dotl);
74 inline int p9_is_proto_dotu(struct p9_client *clnt)
76 return clnt->proto_version == p9_proto_2000u;
78 EXPORT_SYMBOL(p9_is_proto_dotu);
81 * Some error codes are taken directly from the server replies,
82 * make sure they are valid.
84 static int safe_errno(int err)
86 if ((err > 0) || (err < -MAX_ERRNO)) {
87 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err);
94 /* Interpret mount option for protocol version */
95 static int get_protocol_version(char *s)
97 int version = -EINVAL;
99 if (!strcmp(s, "9p2000")) {
100 version = p9_proto_legacy;
101 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n");
102 } else if (!strcmp(s, "9p2000.u")) {
103 version = p9_proto_2000u;
104 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
105 } else if (!strcmp(s, "9p2000.L")) {
106 version = p9_proto_2000L;
107 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
109 pr_info("Unknown protocol version %s\n", s);
115 * parse_options - parse mount options into client structure
116 * @opts: options string passed from mount
117 * @clnt: existing v9fs client information
119 * Return 0 upon success, -ERRNO upon failure
122 static int parse_opts(char *opts, struct p9_client *clnt)
124 char *options, *tmp_options;
126 substring_t args[MAX_OPT_ARGS];
131 clnt->proto_version = p9_proto_2000L;
137 tmp_options = kstrdup(opts, GFP_KERNEL);
139 p9_debug(P9_DEBUG_ERROR,
140 "failed to allocate copy of option string\n");
143 options = tmp_options;
145 while ((p = strsep(&options, ",")) != NULL) {
149 token = match_token(p, tokens, args);
152 r = match_int(&args[0], &option);
154 p9_debug(P9_DEBUG_ERROR,
155 "integer field, but no integer?\n");
160 p9_debug(P9_DEBUG_ERROR,
161 "msize should be at least 4k\n");
165 clnt->msize = option;
168 s = match_strdup(&args[0]);
171 p9_debug(P9_DEBUG_ERROR,
172 "problem allocating copy of trans arg\n");
173 goto free_and_return;
175 clnt->trans_mod = v9fs_get_trans_by_name(s);
176 if (clnt->trans_mod == NULL) {
177 pr_info("Could not find request transport: %s\n",
181 goto free_and_return;
186 clnt->proto_version = p9_proto_legacy;
189 s = match_strdup(&args[0]);
192 p9_debug(P9_DEBUG_ERROR,
193 "problem allocating copy of version arg\n");
194 goto free_and_return;
196 ret = get_protocol_version(s);
197 if (ret == -EINVAL) {
199 goto free_and_return;
202 clnt->proto_version = ret;
214 static struct p9_fcall *p9_fcall_alloc(int alloc_msize)
217 fc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, GFP_NOFS);
220 fc->capacity = alloc_msize;
221 fc->sdata = (char *) fc + sizeof(struct p9_fcall);
226 * p9_tag_alloc - lookup/allocate a request by tag
227 * @c: client session to lookup tag within
228 * @tag: numeric id for transaction
230 * this is a simple array lookup, but will grow the
231 * request_slots as necessary to accommodate transaction
232 * ids which did not previously have a slot.
234 * this code relies on the client spinlock to manage locks, its
235 * possible we should switch to something else, but I'd rather
236 * stick with something low-overhead for the common case.
240 static struct p9_req_t *
241 p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
245 struct p9_req_t *req;
246 int alloc_msize = min(c->msize, max_size);
248 /* This looks up the original request by tag so we know which
249 * buffer to read the data into */
252 if (tag >= c->max_tag) {
253 spin_lock_irqsave(&c->lock, flags);
254 /* check again since original check was outside of lock */
255 while (tag >= c->max_tag) {
256 row = (tag / P9_ROW_MAXTAG);
257 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
258 sizeof(struct p9_req_t), GFP_ATOMIC);
261 pr_err("Couldn't grow tag array\n");
262 spin_unlock_irqrestore(&c->lock, flags);
263 return ERR_PTR(-ENOMEM);
265 for (col = 0; col < P9_ROW_MAXTAG; col++) {
266 c->reqs[row][col].status = REQ_STATUS_IDLE;
267 c->reqs[row][col].tc = NULL;
269 c->max_tag += P9_ROW_MAXTAG;
271 spin_unlock_irqrestore(&c->lock, flags);
273 row = tag / P9_ROW_MAXTAG;
274 col = tag % P9_ROW_MAXTAG;
276 req = &c->reqs[row][col];
278 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
281 init_waitqueue_head(req->wq);
285 req->tc = p9_fcall_alloc(alloc_msize);
287 req->rc = p9_fcall_alloc(alloc_msize);
288 if (!req->tc || !req->rc)
291 p9pdu_reset(req->tc);
292 p9pdu_reset(req->rc);
294 req->tc->tag = tag-1;
295 req->status = REQ_STATUS_ALLOC;
300 pr_err("Couldn't grow tag array\n");
304 req->tc = req->rc = NULL;
306 return ERR_PTR(-ENOMEM);
310 * p9_tag_lookup - lookup a request by tag
311 * @c: client session to lookup tag within
312 * @tag: numeric id for transaction
316 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
320 /* This looks up the original request by tag so we know which
321 * buffer to read the data into */
324 if(tag >= c->max_tag)
327 row = tag / P9_ROW_MAXTAG;
328 col = tag % P9_ROW_MAXTAG;
330 return &c->reqs[row][col];
332 EXPORT_SYMBOL(p9_tag_lookup);
335 * p9_tag_init - setup tags structure and contents
336 * @c: v9fs client struct
338 * This initializes the tags structure for each client instance.
342 static int p9_tag_init(struct p9_client *c)
346 c->tagpool = p9_idpool_create();
347 if (IS_ERR(c->tagpool)) {
348 err = PTR_ERR(c->tagpool);
351 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
353 p9_idpool_destroy(c->tagpool);
362 * p9_tag_cleanup - cleans up tags structure and reclaims resources
363 * @c: v9fs client struct
365 * This frees resources associated with the tags structure
368 static void p9_tag_cleanup(struct p9_client *c)
372 /* check to insure all requests are idle */
373 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
374 for (col = 0; col < P9_ROW_MAXTAG; col++) {
375 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
376 p9_debug(P9_DEBUG_MUX,
377 "Attempting to cleanup non-free tag %d,%d\n",
379 /* TODO: delay execution of cleanup */
386 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
387 p9_idpool_destroy(c->tagpool);
390 /* free requests associated with tags */
391 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
392 for (col = 0; col < P9_ROW_MAXTAG; col++) {
393 kfree(c->reqs[row][col].wq);
394 kfree(c->reqs[row][col].tc);
395 kfree(c->reqs[row][col].rc);
403 * p9_free_req - free a request and clean-up as necessary
405 * r: request to release
409 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
411 int tag = r->tc->tag;
412 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
414 r->status = REQ_STATUS_IDLE;
415 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
416 p9_idpool_put(tag, c->tagpool);
420 * p9_client_cb - call back from transport to client
422 * req: request received
425 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
427 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
430 * This barrier is needed to make sure any change made to req before
431 * the other thread wakes up will indeed be seen by the waiting side.
434 req->status = status;
437 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
439 EXPORT_SYMBOL(p9_client_cb);
442 * p9_parse_header - parse header arguments out of a packet
443 * @pdu: packet to parse
444 * @size: size of packet
445 * @type: type of request
446 * @tag: tag of packet
447 * @rewind: set if we need to rewind offset afterwards
451 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
457 int offset = pdu->offset;
464 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
466 goto rewind_and_exit;
472 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
473 pdu->size, pdu->id, pdu->tag);
485 pdu->offset = offset;
488 EXPORT_SYMBOL(p9_parse_header);
491 * p9_check_errors - check 9p packet for error return and process it
492 * @c: current client instance
493 * @req: request to parse and check for error conditions
495 * returns error code if one is discovered, otherwise returns 0
497 * this will have to be more complicated if we have multiple
501 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
507 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
509 * dump the response from server
510 * This should be after check errors which poplulate pdu_fcall.
512 trace_9p_protocol_dump(c, req->rc);
514 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
517 if (type != P9_RERROR && type != P9_RLERROR)
520 if (!p9_is_proto_dotl(c)) {
522 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
527 if (p9_is_proto_dotu(c) && ecode < 512)
531 err = p9_errstr2errno(ename, strlen(ename));
533 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
538 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
541 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
547 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
553 * p9_check_zc_errors - check 9p packet for error return and process it
554 * @c: current client instance
555 * @req: request to parse and check for error conditions
556 * @in_hdrlen: Size of response protocol buffer.
558 * returns error code if one is discovered, otherwise returns 0
560 * this will have to be more complicated if we have multiple
564 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
565 struct iov_iter *uidata, int in_hdrlen)
572 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
574 * dump the response from server
575 * This should be after parse_header which poplulate pdu_fcall.
577 trace_9p_protocol_dump(c, req->rc);
579 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
583 if (type != P9_RERROR && type != P9_RLERROR)
586 if (!p9_is_proto_dotl(c)) {
587 /* Error is reported in string format */
589 /* 7 = header size for RERROR; */
590 int inline_len = in_hdrlen - 7;
592 len = req->rc->size - req->rc->offset;
593 if (len > (P9_ZC_HDR_SZ - 7)) {
598 ename = &req->rc->sdata[req->rc->offset];
599 if (len > inline_len) {
600 /* We have error in external buffer */
601 err = copy_from_iter(ename + inline_len,
602 len - inline_len, uidata);
603 if (err != len - inline_len) {
609 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
614 if (p9_is_proto_dotu(c) && ecode < 512)
618 err = p9_errstr2errno(ename, strlen(ename));
620 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
625 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
628 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
633 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
637 static struct p9_req_t *
638 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
641 * p9_client_flush - flush (cancel) a request
643 * @oldreq: request to cancel
645 * This sents a flush for a particular request and links
646 * the flush request to the original request. The current
647 * code only supports a single flush request although the protocol
648 * allows for multiple flush requests to be sent for a single request.
652 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
654 struct p9_req_t *req;
658 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
662 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
664 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
669 * if we haven't received a response for oldreq,
670 * remove it from the list
672 if (oldreq->status == REQ_STATUS_SENT)
673 if (c->trans_mod->cancelled)
674 c->trans_mod->cancelled(c, oldreq);
680 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
681 int8_t type, int req_size,
682 const char *fmt, va_list ap)
685 struct p9_req_t *req;
687 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
689 /* we allow for any status other than disconnected */
690 if (c->status == Disconnected)
691 return ERR_PTR(-EIO);
693 /* if status is begin_disconnected we allow only clunk request */
694 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
695 return ERR_PTR(-EIO);
698 if (type != P9_TVERSION) {
699 tag = p9_idpool_get(c->tagpool);
701 return ERR_PTR(-ENOMEM);
704 req = p9_tag_alloc(c, tag, req_size);
708 /* marshall the data */
709 p9pdu_prepare(req->tc, tag, type);
710 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
713 p9pdu_finalize(c, req->tc);
714 trace_9p_client_req(c, type, tag);
722 * p9_client_rpc - issue a request and wait for a response
724 * @type: type of request
725 * @fmt: protocol format string (see protocol.c)
727 * Returns request structure (which client must free using p9_free_req)
730 static struct p9_req_t *
731 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
736 struct p9_req_t *req;
739 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
744 if (signal_pending(current)) {
746 clear_thread_flag(TIF_SIGPENDING);
750 err = c->trans_mod->request(c, req);
752 if (err != -ERESTARTSYS && err != -EFAULT)
753 c->status = Disconnected;
757 /* Wait for the response */
758 err = wait_event_killable(*req->wq, req->status >= REQ_STATUS_RCVD);
761 * Make sure our req is coherent with regard to updates in other
762 * threads - echoes to wmb() in the callback
766 if ((err == -ERESTARTSYS) && (c->status == Connected)
767 && (type == P9_TFLUSH)) {
769 clear_thread_flag(TIF_SIGPENDING);
773 if (req->status == REQ_STATUS_ERROR) {
774 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
777 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
778 p9_debug(P9_DEBUG_MUX, "flushing\n");
780 clear_thread_flag(TIF_SIGPENDING);
782 if (c->trans_mod->cancel(c, req))
783 p9_client_flush(c, req);
785 /* if we received the response anyway, don't signal error */
786 if (req->status == REQ_STATUS_RCVD)
790 spin_lock_irqsave(¤t->sighand->siglock, flags);
792 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
797 err = p9_check_errors(c, req);
798 trace_9p_client_res(c, type, req->rc->tag, err);
803 return ERR_PTR(safe_errno(err));
807 * p9_client_zc_rpc - issue a request and wait for a response
809 * @type: type of request
810 * @uidata: destination for zero copy read
811 * @uodata: source for zero copy write
812 * @inlen: read buffer size
813 * @olen: write buffer size
814 * @hdrlen: reader header size, This is the size of response protocol data
815 * @fmt: protocol format string (see protocol.c)
817 * Returns request structure (which client must free using p9_free_req)
819 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
820 struct iov_iter *uidata,
821 struct iov_iter *uodata,
822 int inlen, int olen, int in_hdrlen,
823 const char *fmt, ...)
828 struct p9_req_t *req;
832 * We allocate a inline protocol data of only 4k bytes.
833 * The actual content is passed in zero-copy fashion.
835 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
840 if (signal_pending(current)) {
842 clear_thread_flag(TIF_SIGPENDING);
846 err = c->trans_mod->zc_request(c, req, uidata, uodata,
847 inlen, olen, in_hdrlen);
850 c->status = Disconnected;
851 if (err != -ERESTARTSYS)
854 if (req->status == REQ_STATUS_ERROR) {
855 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
858 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
859 p9_debug(P9_DEBUG_MUX, "flushing\n");
861 clear_thread_flag(TIF_SIGPENDING);
863 if (c->trans_mod->cancel(c, req))
864 p9_client_flush(c, req);
866 /* if we received the response anyway, don't signal error */
867 if (req->status == REQ_STATUS_RCVD)
871 spin_lock_irqsave(¤t->sighand->siglock, flags);
873 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
878 err = p9_check_zc_errors(c, req, uidata, in_hdrlen);
879 trace_9p_client_res(c, type, req->rc->tag, err);
884 return ERR_PTR(safe_errno(err));
887 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
893 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
894 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
896 return ERR_PTR(-ENOMEM);
898 ret = p9_idpool_get(clnt->fidpool);
905 memset(&fid->qid, 0, sizeof(struct p9_qid));
907 fid->uid = current_fsuid();
910 spin_lock_irqsave(&clnt->lock, flags);
911 list_add(&fid->flist, &clnt->fidlist);
912 spin_unlock_irqrestore(&clnt->lock, flags);
921 static void p9_fid_destroy(struct p9_fid *fid)
923 struct p9_client *clnt;
926 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
928 p9_idpool_put(fid->fid, clnt->fidpool);
929 spin_lock_irqsave(&clnt->lock, flags);
930 list_del(&fid->flist);
931 spin_unlock_irqrestore(&clnt->lock, flags);
936 static int p9_client_version(struct p9_client *c)
939 struct p9_req_t *req;
940 char *version = NULL;
943 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
944 c->msize, c->proto_version);
946 switch (c->proto_version) {
948 req = p9_client_rpc(c, P9_TVERSION, "ds",
949 c->msize, "9P2000.L");
952 req = p9_client_rpc(c, P9_TVERSION, "ds",
953 c->msize, "9P2000.u");
955 case p9_proto_legacy:
956 req = p9_client_rpc(c, P9_TVERSION, "ds",
966 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
968 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
969 trace_9p_protocol_dump(c, req->rc);
973 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
974 if (!strncmp(version, "9P2000.L", 8))
975 c->proto_version = p9_proto_2000L;
976 else if (!strncmp(version, "9P2000.u", 8))
977 c->proto_version = p9_proto_2000u;
978 else if (!strncmp(version, "9P2000", 6))
979 c->proto_version = p9_proto_legacy;
981 p9_debug(P9_DEBUG_ERROR,
982 "server returned an unknown version: %s\n", version);
988 p9_debug(P9_DEBUG_ERROR,
989 "server returned a msize < 4096: %d\n", msize);
993 if (msize < c->msize)
1003 struct p9_client *p9_client_create(const char *dev_name, char *options)
1006 struct p9_client *clnt;
1010 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
1012 return ERR_PTR(-ENOMEM);
1014 clnt->trans_mod = NULL;
1017 client_id = utsname()->nodename;
1018 memcpy(clnt->name, client_id, strlen(client_id) + 1);
1020 spin_lock_init(&clnt->lock);
1021 INIT_LIST_HEAD(&clnt->fidlist);
1023 err = p9_tag_init(clnt);
1027 err = parse_opts(options, clnt);
1029 goto destroy_tagpool;
1031 if (!clnt->trans_mod)
1032 clnt->trans_mod = v9fs_get_default_trans();
1034 if (clnt->trans_mod == NULL) {
1035 err = -EPROTONOSUPPORT;
1036 p9_debug(P9_DEBUG_ERROR,
1037 "No transport defined or default transport\n");
1038 goto destroy_tagpool;
1041 clnt->fidpool = p9_idpool_create();
1042 if (IS_ERR(clnt->fidpool)) {
1043 err = PTR_ERR(clnt->fidpool);
1047 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1048 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1050 err = clnt->trans_mod->create(clnt, dev_name, options);
1052 goto destroy_fidpool;
1054 if (clnt->msize > clnt->trans_mod->maxsize)
1055 clnt->msize = clnt->trans_mod->maxsize;
1057 if (clnt->msize < 4096) {
1058 p9_debug(P9_DEBUG_ERROR,
1059 "Please specify a msize of at least 4k\n");
1064 err = p9_client_version(clnt);
1071 clnt->trans_mod->close(clnt);
1073 p9_idpool_destroy(clnt->fidpool);
1075 v9fs_put_trans(clnt->trans_mod);
1077 p9_idpool_destroy(clnt->tagpool);
1080 return ERR_PTR(err);
1082 EXPORT_SYMBOL(p9_client_create);
1084 void p9_client_destroy(struct p9_client *clnt)
1086 struct p9_fid *fid, *fidptr;
1088 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1090 if (clnt->trans_mod)
1091 clnt->trans_mod->close(clnt);
1093 v9fs_put_trans(clnt->trans_mod);
1095 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1096 pr_info("Found fid %d not clunked\n", fid->fid);
1097 p9_fid_destroy(fid);
1101 p9_idpool_destroy(clnt->fidpool);
1103 p9_tag_cleanup(clnt);
1107 EXPORT_SYMBOL(p9_client_destroy);
1109 void p9_client_disconnect(struct p9_client *clnt)
1111 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1112 clnt->status = Disconnected;
1114 EXPORT_SYMBOL(p9_client_disconnect);
1116 void p9_client_begin_disconnect(struct p9_client *clnt)
1118 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1119 clnt->status = BeginDisconnect;
1121 EXPORT_SYMBOL(p9_client_begin_disconnect);
1123 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1124 char *uname, kuid_t n_uname, char *aname)
1127 struct p9_req_t *req;
1132 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1133 afid ? afid->fid : -1, uname, aname);
1134 fid = p9_fid_create(clnt);
1142 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1143 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1149 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1151 trace_9p_protocol_dump(clnt, req->rc);
1152 p9_free_req(clnt, req);
1156 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1157 qid.type, (unsigned long long)qid.path, qid.version);
1159 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1161 p9_free_req(clnt, req);
1166 p9_fid_destroy(fid);
1167 return ERR_PTR(err);
1169 EXPORT_SYMBOL(p9_client_attach);
1171 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1172 char **wnames, int clone)
1175 struct p9_client *clnt;
1177 struct p9_qid *wqids;
1178 struct p9_req_t *req;
1179 uint16_t nwqids, count;
1183 clnt = oldfid->clnt;
1185 fid = p9_fid_create(clnt);
1192 fid->uid = oldfid->uid;
1197 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1198 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1200 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1207 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1209 trace_9p_protocol_dump(clnt, req->rc);
1210 p9_free_req(clnt, req);
1213 p9_free_req(clnt, req);
1215 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1217 if (nwqids != nwname) {
1222 for (count = 0; count < nwqids; count++)
1223 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1224 count, wqids[count].type,
1225 (unsigned long long)wqids[count].path,
1226 wqids[count].version);
1229 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1231 fid->qid = oldfid->qid;
1238 p9_client_clunk(fid);
1242 if (fid && (fid != oldfid))
1243 p9_fid_destroy(fid);
1245 return ERR_PTR(err);
1247 EXPORT_SYMBOL(p9_client_walk);
1249 int p9_client_open(struct p9_fid *fid, int mode)
1252 struct p9_client *clnt;
1253 struct p9_req_t *req;
1258 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1259 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1262 if (fid->mode != -1)
1265 if (p9_is_proto_dotl(clnt))
1266 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1268 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1274 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1276 trace_9p_protocol_dump(clnt, req->rc);
1277 goto free_and_error;
1280 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1281 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1282 (unsigned long long)qid.path, qid.version, iounit);
1285 fid->iounit = iounit;
1288 p9_free_req(clnt, req);
1292 EXPORT_SYMBOL(p9_client_open);
1294 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1295 kgid_t gid, struct p9_qid *qid)
1298 struct p9_client *clnt;
1299 struct p9_req_t *req;
1302 p9_debug(P9_DEBUG_9P,
1303 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1304 ofid->fid, name, flags, mode,
1305 from_kgid(&init_user_ns, gid));
1308 if (ofid->mode != -1)
1311 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1318 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1320 trace_9p_protocol_dump(clnt, req->rc);
1321 goto free_and_error;
1324 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1326 (unsigned long long)qid->path,
1327 qid->version, iounit);
1330 ofid->iounit = iounit;
1333 p9_free_req(clnt, req);
1337 EXPORT_SYMBOL(p9_client_create_dotl);
1339 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1343 struct p9_client *clnt;
1344 struct p9_req_t *req;
1348 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1349 fid->fid, name, perm, mode);
1353 if (fid->mode != -1)
1356 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1363 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1365 trace_9p_protocol_dump(clnt, req->rc);
1366 goto free_and_error;
1369 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1371 (unsigned long long)qid.path,
1372 qid.version, iounit);
1375 fid->iounit = iounit;
1378 p9_free_req(clnt, req);
1382 EXPORT_SYMBOL(p9_client_fcreate);
1384 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, kgid_t gid,
1388 struct p9_client *clnt;
1389 struct p9_req_t *req;
1391 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1392 dfid->fid, name, symtgt);
1395 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1402 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1404 trace_9p_protocol_dump(clnt, req->rc);
1405 goto free_and_error;
1408 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1409 qid->type, (unsigned long long)qid->path, qid->version);
1412 p9_free_req(clnt, req);
1416 EXPORT_SYMBOL(p9_client_symlink);
1418 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1420 struct p9_client *clnt;
1421 struct p9_req_t *req;
1423 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1424 dfid->fid, oldfid->fid, newname);
1426 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1429 return PTR_ERR(req);
1431 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1432 p9_free_req(clnt, req);
1435 EXPORT_SYMBOL(p9_client_link);
1437 int p9_client_fsync(struct p9_fid *fid, int datasync)
1440 struct p9_client *clnt;
1441 struct p9_req_t *req;
1443 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1444 fid->fid, datasync);
1448 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1454 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1456 p9_free_req(clnt, req);
1461 EXPORT_SYMBOL(p9_client_fsync);
1463 int p9_client_clunk(struct p9_fid *fid)
1466 struct p9_client *clnt;
1467 struct p9_req_t *req;
1471 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1472 __func__, task_pid_nr(current));
1478 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1483 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1489 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1491 p9_free_req(clnt, req);
1494 * Fid is not valid even after a failed clunk
1495 * If interrupted, retry once then give up and
1496 * leak fid until umount.
1498 if (err == -ERESTARTSYS) {
1502 p9_fid_destroy(fid);
1505 EXPORT_SYMBOL(p9_client_clunk);
1507 int p9_client_remove(struct p9_fid *fid)
1510 struct p9_client *clnt;
1511 struct p9_req_t *req;
1513 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1517 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1523 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1525 p9_free_req(clnt, req);
1527 if (err == -ERESTARTSYS)
1528 p9_client_clunk(fid);
1530 p9_fid_destroy(fid);
1533 EXPORT_SYMBOL(p9_client_remove);
1535 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1538 struct p9_req_t *req;
1539 struct p9_client *clnt;
1541 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1542 dfid->fid, name, flags);
1545 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1550 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1552 p9_free_req(clnt, req);
1556 EXPORT_SYMBOL(p9_client_unlinkat);
1559 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
1561 struct p9_client *clnt = fid->clnt;
1562 struct p9_req_t *req;
1566 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1567 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to));
1569 while (iov_iter_count(to)) {
1570 int count = iov_iter_count(to);
1571 int rsize, non_zc = 0;
1574 rsize = fid->iounit;
1575 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1576 rsize = clnt->msize - P9_IOHDRSZ;
1581 /* Don't bother zerocopy for small IO (< 1024) */
1582 if (clnt->trans_mod->zc_request && rsize > 1024) {
1584 * response header len is 11
1585 * PDU Header(7) + IO Size (4)
1587 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize,
1588 0, 11, "dqd", fid->fid,
1592 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1596 *err = PTR_ERR(req);
1600 *err = p9pdu_readf(req->rc, clnt->proto_version,
1601 "D", &count, &dataptr);
1603 trace_9p_protocol_dump(clnt, req->rc);
1604 p9_free_req(clnt, req);
1607 if (rsize < count) {
1608 pr_err("bogus RREAD count (%d > %d)\n", count, rsize);
1612 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1614 p9_free_req(clnt, req);
1619 int n = copy_to_iter(dataptr, count, to);
1624 p9_free_req(clnt, req);
1628 iov_iter_advance(to, count);
1632 p9_free_req(clnt, req);
1636 EXPORT_SYMBOL(p9_client_read);
1639 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
1641 struct p9_client *clnt = fid->clnt;
1642 struct p9_req_t *req;
1646 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n",
1647 fid->fid, (unsigned long long) offset,
1648 iov_iter_count(from));
1650 while (iov_iter_count(from)) {
1651 int count = iov_iter_count(from);
1652 int rsize = fid->iounit;
1653 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1654 rsize = clnt->msize - P9_IOHDRSZ;
1659 /* Don't bother zerocopy for small IO (< 1024) */
1660 if (clnt->trans_mod->zc_request && rsize > 1024) {
1661 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
1662 rsize, P9_ZC_HDR_SZ, "dqd",
1663 fid->fid, offset, rsize);
1665 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
1666 offset, rsize, from);
1669 *err = PTR_ERR(req);
1673 *err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1675 trace_9p_protocol_dump(clnt, req->rc);
1676 p9_free_req(clnt, req);
1679 if (rsize < count) {
1680 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize);
1684 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1686 p9_free_req(clnt, req);
1687 iov_iter_advance(from, count);
1693 EXPORT_SYMBOL(p9_client_write);
1695 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1698 struct p9_client *clnt;
1699 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1700 struct p9_req_t *req;
1703 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1706 return ERR_PTR(-ENOMEM);
1711 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1717 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1719 trace_9p_protocol_dump(clnt, req->rc);
1720 p9_free_req(clnt, req);
1724 p9_debug(P9_DEBUG_9P,
1725 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1726 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1727 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1728 "<<< uid=%d gid=%d n_muid=%d\n",
1729 ret->size, ret->type, ret->dev, ret->qid.type,
1730 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1731 ret->atime, ret->mtime, (unsigned long long)ret->length,
1732 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1733 from_kuid(&init_user_ns, ret->n_uid),
1734 from_kgid(&init_user_ns, ret->n_gid),
1735 from_kuid(&init_user_ns, ret->n_muid));
1737 p9_free_req(clnt, req);
1742 return ERR_PTR(err);
1744 EXPORT_SYMBOL(p9_client_stat);
1746 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1750 struct p9_client *clnt;
1751 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1753 struct p9_req_t *req;
1755 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1756 fid->fid, request_mask);
1759 return ERR_PTR(-ENOMEM);
1764 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1770 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1772 trace_9p_protocol_dump(clnt, req->rc);
1773 p9_free_req(clnt, req);
1777 p9_debug(P9_DEBUG_9P,
1778 "<<< RGETATTR st_result_mask=%lld\n"
1779 "<<< qid=%x.%llx.%x\n"
1780 "<<< st_mode=%8.8x st_nlink=%llu\n"
1781 "<<< st_uid=%d st_gid=%d\n"
1782 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1783 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1784 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1785 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1786 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1787 "<<< st_gen=%lld st_data_version=%lld",
1788 ret->st_result_mask, ret->qid.type, ret->qid.path,
1789 ret->qid.version, ret->st_mode, ret->st_nlink,
1790 from_kuid(&init_user_ns, ret->st_uid),
1791 from_kgid(&init_user_ns, ret->st_gid),
1792 ret->st_rdev, ret->st_size, ret->st_blksize,
1793 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1794 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1795 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1796 ret->st_gen, ret->st_data_version);
1798 p9_free_req(clnt, req);
1803 return ERR_PTR(err);
1805 EXPORT_SYMBOL(p9_client_getattr_dotl);
1807 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1811 /* NOTE: size shouldn't include its own length */
1812 /* size[2] type[2] dev[4] qid[13] */
1813 /* mode[4] atime[4] mtime[4] length[8]*/
1814 /* name[s] uid[s] gid[s] muid[s] */
1815 ret = 2+4+13+4+4+4+8+2+2+2+2;
1818 ret += strlen(wst->name);
1820 ret += strlen(wst->uid);
1822 ret += strlen(wst->gid);
1824 ret += strlen(wst->muid);
1826 if ((proto_version == p9_proto_2000u) ||
1827 (proto_version == p9_proto_2000L)) {
1828 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1830 ret += strlen(wst->extension);
1836 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1839 struct p9_req_t *req;
1840 struct p9_client *clnt;
1844 wst->size = p9_client_statsize(wst, clnt->proto_version);
1845 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1846 p9_debug(P9_DEBUG_9P,
1847 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1848 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1849 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1850 " uid=%d gid=%d n_muid=%d\n",
1851 wst->size, wst->type, wst->dev, wst->qid.type,
1852 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1853 wst->atime, wst->mtime, (unsigned long long)wst->length,
1854 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1855 from_kuid(&init_user_ns, wst->n_uid),
1856 from_kgid(&init_user_ns, wst->n_gid),
1857 from_kuid(&init_user_ns, wst->n_muid));
1859 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1865 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1867 p9_free_req(clnt, req);
1871 EXPORT_SYMBOL(p9_client_wstat);
1873 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1876 struct p9_req_t *req;
1877 struct p9_client *clnt;
1881 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1882 p9_debug(P9_DEBUG_9P,
1883 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1884 " atime_sec=%lld atime_nsec=%lld\n"
1885 " mtime_sec=%lld mtime_nsec=%lld\n",
1886 p9attr->valid, p9attr->mode,
1887 from_kuid(&init_user_ns, p9attr->uid),
1888 from_kgid(&init_user_ns, p9attr->gid),
1889 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1890 p9attr->mtime_sec, p9attr->mtime_nsec);
1892 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1898 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1899 p9_free_req(clnt, req);
1903 EXPORT_SYMBOL(p9_client_setattr);
1905 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1908 struct p9_req_t *req;
1909 struct p9_client *clnt;
1914 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1916 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1922 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1923 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1924 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1926 trace_9p_protocol_dump(clnt, req->rc);
1927 p9_free_req(clnt, req);
1931 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1932 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1933 "fsid %llu namelen %ld\n",
1934 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1935 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1936 sb->fsid, (long int)sb->namelen);
1938 p9_free_req(clnt, req);
1942 EXPORT_SYMBOL(p9_client_statfs);
1944 int p9_client_rename(struct p9_fid *fid,
1945 struct p9_fid *newdirfid, const char *name)
1948 struct p9_req_t *req;
1949 struct p9_client *clnt;
1954 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1955 fid->fid, newdirfid->fid, name);
1957 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1958 newdirfid->fid, name);
1964 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1966 p9_free_req(clnt, req);
1970 EXPORT_SYMBOL(p9_client_rename);
1972 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1973 struct p9_fid *newdirfid, const char *new_name)
1976 struct p9_req_t *req;
1977 struct p9_client *clnt;
1980 clnt = olddirfid->clnt;
1982 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1983 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1984 newdirfid->fid, new_name);
1986 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1987 old_name, newdirfid->fid, new_name);
1993 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1994 newdirfid->fid, new_name);
1996 p9_free_req(clnt, req);
2000 EXPORT_SYMBOL(p9_client_renameat);
2003 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
2005 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
2006 const char *attr_name, u64 *attr_size)
2009 struct p9_req_t *req;
2010 struct p9_client *clnt;
2011 struct p9_fid *attr_fid;
2014 clnt = file_fid->clnt;
2015 attr_fid = p9_fid_create(clnt);
2016 if (IS_ERR(attr_fid)) {
2017 err = PTR_ERR(attr_fid);
2021 p9_debug(P9_DEBUG_9P,
2022 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2023 file_fid->fid, attr_fid->fid, attr_name);
2025 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2026 file_fid->fid, attr_fid->fid, attr_name);
2031 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
2033 trace_9p_protocol_dump(clnt, req->rc);
2034 p9_free_req(clnt, req);
2037 p9_free_req(clnt, req);
2038 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2039 attr_fid->fid, *attr_size);
2042 p9_client_clunk(attr_fid);
2045 if (attr_fid && (attr_fid != file_fid))
2046 p9_fid_destroy(attr_fid);
2048 return ERR_PTR(err);
2050 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2052 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2053 u64 attr_size, int flags)
2056 struct p9_req_t *req;
2057 struct p9_client *clnt;
2059 p9_debug(P9_DEBUG_9P,
2060 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2061 fid->fid, name, (long long)attr_size, flags);
2064 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2065 fid->fid, name, attr_size, flags);
2070 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2071 p9_free_req(clnt, req);
2075 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2077 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2079 int err, rsize, non_zc = 0;
2080 struct p9_client *clnt;
2081 struct p9_req_t *req;
2083 struct kvec kv = {.iov_base = data, .iov_len = count};
2086 iov_iter_kvec(&to, READ | ITER_KVEC, &kv, 1, count);
2088 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2089 fid->fid, (unsigned long long) offset, count);
2094 rsize = fid->iounit;
2095 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2096 rsize = clnt->msize - P9_READDIRHDRSZ;
2101 /* Don't bother zerocopy for small IO (< 1024) */
2102 if (clnt->trans_mod->zc_request && rsize > 1024) {
2104 * response header len is 11
2105 * PDU Header(7) + IO Size (4)
2107 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0,
2108 11, "dqd", fid->fid, offset, rsize);
2111 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2119 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2121 trace_9p_protocol_dump(clnt, req->rc);
2122 goto free_and_error;
2124 if (rsize < count) {
2125 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize);
2129 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2132 memmove(data, dataptr, count);
2134 p9_free_req(clnt, req);
2138 p9_free_req(clnt, req);
2142 EXPORT_SYMBOL(p9_client_readdir);
2144 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
2145 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2148 struct p9_client *clnt;
2149 struct p9_req_t *req;
2153 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2154 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2155 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2156 MAJOR(rdev), MINOR(rdev), gid);
2158 return PTR_ERR(req);
2160 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2162 trace_9p_protocol_dump(clnt, req->rc);
2165 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2166 (unsigned long long)qid->path, qid->version);
2169 p9_free_req(clnt, req);
2173 EXPORT_SYMBOL(p9_client_mknod_dotl);
2175 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
2176 kgid_t gid, struct p9_qid *qid)
2179 struct p9_client *clnt;
2180 struct p9_req_t *req;
2184 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2185 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2186 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
2189 return PTR_ERR(req);
2191 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2193 trace_9p_protocol_dump(clnt, req->rc);
2196 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2197 (unsigned long long)qid->path, qid->version);
2200 p9_free_req(clnt, req);
2204 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2206 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2209 struct p9_client *clnt;
2210 struct p9_req_t *req;
2214 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2215 "start %lld length %lld proc_id %d client_id %s\n",
2216 fid->fid, flock->type, flock->flags, flock->start,
2217 flock->length, flock->proc_id, flock->client_id);
2219 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2220 flock->flags, flock->start, flock->length,
2221 flock->proc_id, flock->client_id);
2224 return PTR_ERR(req);
2226 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2228 trace_9p_protocol_dump(clnt, req->rc);
2231 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2233 p9_free_req(clnt, req);
2237 EXPORT_SYMBOL(p9_client_lock_dotl);
2239 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2242 struct p9_client *clnt;
2243 struct p9_req_t *req;
2247 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2248 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2249 glock->start, glock->length, glock->proc_id, glock->client_id);
2251 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2252 glock->start, glock->length, glock->proc_id, glock->client_id);
2255 return PTR_ERR(req);
2257 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2258 &glock->start, &glock->length, &glock->proc_id,
2261 trace_9p_protocol_dump(clnt, req->rc);
2264 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2265 "proc_id %d client_id %s\n", glock->type, glock->start,
2266 glock->length, glock->proc_id, glock->client_id);
2268 p9_free_req(clnt, req);
2271 EXPORT_SYMBOL(p9_client_getlock_dotl);
2273 int p9_client_readlink(struct p9_fid *fid, char **target)
2276 struct p9_client *clnt;
2277 struct p9_req_t *req;
2281 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2283 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2285 return PTR_ERR(req);
2287 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2289 trace_9p_protocol_dump(clnt, req->rc);
2292 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2294 p9_free_req(clnt, req);
2297 EXPORT_SYMBOL(p9_client_readlink);