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 = kzalloc(sizeof(struct p9_fid), GFP_KERNEL);
896 return ERR_PTR(-ENOMEM);
898 ret = p9_idpool_get(clnt->fidpool);
906 fid->uid = current_fsuid();
908 spin_lock_irqsave(&clnt->lock, flags);
909 list_add(&fid->flist, &clnt->fidlist);
910 spin_unlock_irqrestore(&clnt->lock, flags);
919 static void p9_fid_destroy(struct p9_fid *fid)
921 struct p9_client *clnt;
924 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
926 p9_idpool_put(fid->fid, clnt->fidpool);
927 spin_lock_irqsave(&clnt->lock, flags);
928 list_del(&fid->flist);
929 spin_unlock_irqrestore(&clnt->lock, flags);
934 static int p9_client_version(struct p9_client *c)
937 struct p9_req_t *req;
938 char *version = NULL;
941 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
942 c->msize, c->proto_version);
944 switch (c->proto_version) {
946 req = p9_client_rpc(c, P9_TVERSION, "ds",
947 c->msize, "9P2000.L");
950 req = p9_client_rpc(c, P9_TVERSION, "ds",
951 c->msize, "9P2000.u");
953 case p9_proto_legacy:
954 req = p9_client_rpc(c, P9_TVERSION, "ds",
964 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
966 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
967 trace_9p_protocol_dump(c, req->rc);
971 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
972 if (!strncmp(version, "9P2000.L", 8))
973 c->proto_version = p9_proto_2000L;
974 else if (!strncmp(version, "9P2000.u", 8))
975 c->proto_version = p9_proto_2000u;
976 else if (!strncmp(version, "9P2000", 6))
977 c->proto_version = p9_proto_legacy;
979 p9_debug(P9_DEBUG_ERROR,
980 "server returned an unknown version: %s\n", version);
986 p9_debug(P9_DEBUG_ERROR,
987 "server returned a msize < 4096: %d\n", msize);
991 if (msize < c->msize)
1001 struct p9_client *p9_client_create(const char *dev_name, char *options)
1004 struct p9_client *clnt;
1008 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
1010 return ERR_PTR(-ENOMEM);
1012 clnt->trans_mod = NULL;
1015 client_id = utsname()->nodename;
1016 memcpy(clnt->name, client_id, strlen(client_id) + 1);
1018 spin_lock_init(&clnt->lock);
1019 INIT_LIST_HEAD(&clnt->fidlist);
1021 err = p9_tag_init(clnt);
1025 err = parse_opts(options, clnt);
1027 goto destroy_tagpool;
1029 if (!clnt->trans_mod)
1030 clnt->trans_mod = v9fs_get_default_trans();
1032 if (clnt->trans_mod == NULL) {
1033 err = -EPROTONOSUPPORT;
1034 p9_debug(P9_DEBUG_ERROR,
1035 "No transport defined or default transport\n");
1036 goto destroy_tagpool;
1039 clnt->fidpool = p9_idpool_create();
1040 if (IS_ERR(clnt->fidpool)) {
1041 err = PTR_ERR(clnt->fidpool);
1045 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1046 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1048 err = clnt->trans_mod->create(clnt, dev_name, options);
1050 goto destroy_fidpool;
1052 if (clnt->msize > clnt->trans_mod->maxsize)
1053 clnt->msize = clnt->trans_mod->maxsize;
1055 if (clnt->msize < 4096) {
1056 p9_debug(P9_DEBUG_ERROR,
1057 "Please specify a msize of at least 4k\n");
1062 err = p9_client_version(clnt);
1069 clnt->trans_mod->close(clnt);
1071 p9_idpool_destroy(clnt->fidpool);
1073 v9fs_put_trans(clnt->trans_mod);
1075 p9_idpool_destroy(clnt->tagpool);
1078 return ERR_PTR(err);
1080 EXPORT_SYMBOL(p9_client_create);
1082 void p9_client_destroy(struct p9_client *clnt)
1084 struct p9_fid *fid, *fidptr;
1086 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1088 if (clnt->trans_mod)
1089 clnt->trans_mod->close(clnt);
1091 v9fs_put_trans(clnt->trans_mod);
1093 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1094 pr_info("Found fid %d not clunked\n", fid->fid);
1095 p9_fid_destroy(fid);
1099 p9_idpool_destroy(clnt->fidpool);
1101 p9_tag_cleanup(clnt);
1105 EXPORT_SYMBOL(p9_client_destroy);
1107 void p9_client_disconnect(struct p9_client *clnt)
1109 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1110 clnt->status = Disconnected;
1112 EXPORT_SYMBOL(p9_client_disconnect);
1114 void p9_client_begin_disconnect(struct p9_client *clnt)
1116 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1117 clnt->status = BeginDisconnect;
1119 EXPORT_SYMBOL(p9_client_begin_disconnect);
1121 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1122 char *uname, kuid_t n_uname, char *aname)
1125 struct p9_req_t *req;
1130 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1131 afid ? afid->fid : -1, uname, aname);
1132 fid = p9_fid_create(clnt);
1140 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1141 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1147 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1149 trace_9p_protocol_dump(clnt, req->rc);
1150 p9_free_req(clnt, req);
1154 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1155 qid.type, (unsigned long long)qid.path, qid.version);
1157 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1159 p9_free_req(clnt, req);
1164 p9_fid_destroy(fid);
1165 return ERR_PTR(err);
1167 EXPORT_SYMBOL(p9_client_attach);
1169 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1170 char **wnames, int clone)
1173 struct p9_client *clnt;
1175 struct p9_qid *wqids;
1176 struct p9_req_t *req;
1177 uint16_t nwqids, count;
1181 clnt = oldfid->clnt;
1183 fid = p9_fid_create(clnt);
1190 fid->uid = oldfid->uid;
1195 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1196 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1198 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1205 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1207 trace_9p_protocol_dump(clnt, req->rc);
1208 p9_free_req(clnt, req);
1211 p9_free_req(clnt, req);
1213 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1215 if (nwqids != nwname) {
1220 for (count = 0; count < nwqids; count++)
1221 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1222 count, wqids[count].type,
1223 (unsigned long long)wqids[count].path,
1224 wqids[count].version);
1227 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1229 fid->qid = oldfid->qid;
1236 p9_client_clunk(fid);
1240 if (fid && (fid != oldfid))
1241 p9_fid_destroy(fid);
1243 return ERR_PTR(err);
1245 EXPORT_SYMBOL(p9_client_walk);
1247 int p9_client_open(struct p9_fid *fid, int mode)
1250 struct p9_client *clnt;
1251 struct p9_req_t *req;
1256 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1257 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1260 if (fid->mode != -1)
1263 if (p9_is_proto_dotl(clnt))
1264 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1266 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1272 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1274 trace_9p_protocol_dump(clnt, req->rc);
1275 goto free_and_error;
1278 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1279 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1280 (unsigned long long)qid.path, qid.version, iounit);
1283 fid->iounit = iounit;
1286 p9_free_req(clnt, req);
1290 EXPORT_SYMBOL(p9_client_open);
1292 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1293 kgid_t gid, struct p9_qid *qid)
1296 struct p9_client *clnt;
1297 struct p9_req_t *req;
1300 p9_debug(P9_DEBUG_9P,
1301 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1302 ofid->fid, name, flags, mode,
1303 from_kgid(&init_user_ns, gid));
1306 if (ofid->mode != -1)
1309 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1316 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1318 trace_9p_protocol_dump(clnt, req->rc);
1319 goto free_and_error;
1322 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1324 (unsigned long long)qid->path,
1325 qid->version, iounit);
1328 ofid->iounit = iounit;
1331 p9_free_req(clnt, req);
1335 EXPORT_SYMBOL(p9_client_create_dotl);
1337 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1341 struct p9_client *clnt;
1342 struct p9_req_t *req;
1346 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1347 fid->fid, name, perm, mode);
1351 if (fid->mode != -1)
1354 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1361 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1363 trace_9p_protocol_dump(clnt, req->rc);
1364 goto free_and_error;
1367 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1369 (unsigned long long)qid.path,
1370 qid.version, iounit);
1373 fid->iounit = iounit;
1376 p9_free_req(clnt, req);
1380 EXPORT_SYMBOL(p9_client_fcreate);
1382 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, kgid_t gid,
1386 struct p9_client *clnt;
1387 struct p9_req_t *req;
1389 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1390 dfid->fid, name, symtgt);
1393 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1400 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1402 trace_9p_protocol_dump(clnt, req->rc);
1403 goto free_and_error;
1406 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1407 qid->type, (unsigned long long)qid->path, qid->version);
1410 p9_free_req(clnt, req);
1414 EXPORT_SYMBOL(p9_client_symlink);
1416 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1418 struct p9_client *clnt;
1419 struct p9_req_t *req;
1421 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1422 dfid->fid, oldfid->fid, newname);
1424 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1427 return PTR_ERR(req);
1429 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1430 p9_free_req(clnt, req);
1433 EXPORT_SYMBOL(p9_client_link);
1435 int p9_client_fsync(struct p9_fid *fid, int datasync)
1438 struct p9_client *clnt;
1439 struct p9_req_t *req;
1441 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1442 fid->fid, datasync);
1446 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1452 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1454 p9_free_req(clnt, req);
1459 EXPORT_SYMBOL(p9_client_fsync);
1461 int p9_client_clunk(struct p9_fid *fid)
1464 struct p9_client *clnt;
1465 struct p9_req_t *req;
1469 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1470 __func__, task_pid_nr(current));
1476 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1481 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1487 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1489 p9_free_req(clnt, req);
1492 * Fid is not valid even after a failed clunk
1493 * If interrupted, retry once then give up and
1494 * leak fid until umount.
1496 if (err == -ERESTARTSYS) {
1500 p9_fid_destroy(fid);
1503 EXPORT_SYMBOL(p9_client_clunk);
1505 int p9_client_remove(struct p9_fid *fid)
1508 struct p9_client *clnt;
1509 struct p9_req_t *req;
1511 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1515 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1521 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1523 p9_free_req(clnt, req);
1525 if (err == -ERESTARTSYS)
1526 p9_client_clunk(fid);
1528 p9_fid_destroy(fid);
1531 EXPORT_SYMBOL(p9_client_remove);
1533 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1536 struct p9_req_t *req;
1537 struct p9_client *clnt;
1539 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1540 dfid->fid, name, flags);
1543 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1548 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1550 p9_free_req(clnt, req);
1554 EXPORT_SYMBOL(p9_client_unlinkat);
1557 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
1559 struct p9_client *clnt = fid->clnt;
1560 struct p9_req_t *req;
1564 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1565 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to));
1567 while (iov_iter_count(to)) {
1568 int count = iov_iter_count(to);
1569 int rsize, non_zc = 0;
1572 rsize = fid->iounit;
1573 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1574 rsize = clnt->msize - P9_IOHDRSZ;
1579 /* Don't bother zerocopy for small IO (< 1024) */
1580 if (clnt->trans_mod->zc_request && rsize > 1024) {
1582 * response header len is 11
1583 * PDU Header(7) + IO Size (4)
1585 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize,
1586 0, 11, "dqd", fid->fid,
1590 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1594 *err = PTR_ERR(req);
1598 *err = p9pdu_readf(req->rc, clnt->proto_version,
1599 "D", &count, &dataptr);
1601 trace_9p_protocol_dump(clnt, req->rc);
1602 p9_free_req(clnt, req);
1605 if (rsize < count) {
1606 pr_err("bogus RREAD count (%d > %d)\n", count, rsize);
1610 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1612 p9_free_req(clnt, req);
1617 int n = copy_to_iter(dataptr, count, to);
1622 p9_free_req(clnt, req);
1626 iov_iter_advance(to, count);
1630 p9_free_req(clnt, req);
1634 EXPORT_SYMBOL(p9_client_read);
1637 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
1639 struct p9_client *clnt = fid->clnt;
1640 struct p9_req_t *req;
1644 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n",
1645 fid->fid, (unsigned long long) offset,
1646 iov_iter_count(from));
1648 while (iov_iter_count(from)) {
1649 int count = iov_iter_count(from);
1650 int rsize = fid->iounit;
1651 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1652 rsize = clnt->msize - P9_IOHDRSZ;
1657 /* Don't bother zerocopy for small IO (< 1024) */
1658 if (clnt->trans_mod->zc_request && rsize > 1024) {
1659 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
1660 rsize, P9_ZC_HDR_SZ, "dqd",
1661 fid->fid, offset, rsize);
1663 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
1664 offset, rsize, from);
1667 *err = PTR_ERR(req);
1671 *err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1673 trace_9p_protocol_dump(clnt, req->rc);
1674 p9_free_req(clnt, req);
1677 if (rsize < count) {
1678 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize);
1682 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1684 p9_free_req(clnt, req);
1685 iov_iter_advance(from, count);
1691 EXPORT_SYMBOL(p9_client_write);
1693 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1696 struct p9_client *clnt;
1697 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1698 struct p9_req_t *req;
1701 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1704 return ERR_PTR(-ENOMEM);
1709 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1715 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1717 trace_9p_protocol_dump(clnt, req->rc);
1718 p9_free_req(clnt, req);
1722 p9_debug(P9_DEBUG_9P,
1723 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1724 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1725 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1726 "<<< uid=%d gid=%d n_muid=%d\n",
1727 ret->size, ret->type, ret->dev, ret->qid.type,
1728 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1729 ret->atime, ret->mtime, (unsigned long long)ret->length,
1730 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1731 from_kuid(&init_user_ns, ret->n_uid),
1732 from_kgid(&init_user_ns, ret->n_gid),
1733 from_kuid(&init_user_ns, ret->n_muid));
1735 p9_free_req(clnt, req);
1740 return ERR_PTR(err);
1742 EXPORT_SYMBOL(p9_client_stat);
1744 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1748 struct p9_client *clnt;
1749 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1751 struct p9_req_t *req;
1753 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1754 fid->fid, request_mask);
1757 return ERR_PTR(-ENOMEM);
1762 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1768 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1770 trace_9p_protocol_dump(clnt, req->rc);
1771 p9_free_req(clnt, req);
1775 p9_debug(P9_DEBUG_9P,
1776 "<<< RGETATTR st_result_mask=%lld\n"
1777 "<<< qid=%x.%llx.%x\n"
1778 "<<< st_mode=%8.8x st_nlink=%llu\n"
1779 "<<< st_uid=%d st_gid=%d\n"
1780 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1781 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1782 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1783 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1784 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1785 "<<< st_gen=%lld st_data_version=%lld",
1786 ret->st_result_mask, ret->qid.type, ret->qid.path,
1787 ret->qid.version, ret->st_mode, ret->st_nlink,
1788 from_kuid(&init_user_ns, ret->st_uid),
1789 from_kgid(&init_user_ns, ret->st_gid),
1790 ret->st_rdev, ret->st_size, ret->st_blksize,
1791 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1792 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1793 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1794 ret->st_gen, ret->st_data_version);
1796 p9_free_req(clnt, req);
1801 return ERR_PTR(err);
1803 EXPORT_SYMBOL(p9_client_getattr_dotl);
1805 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1809 /* NOTE: size shouldn't include its own length */
1810 /* size[2] type[2] dev[4] qid[13] */
1811 /* mode[4] atime[4] mtime[4] length[8]*/
1812 /* name[s] uid[s] gid[s] muid[s] */
1813 ret = 2+4+13+4+4+4+8+2+2+2+2;
1816 ret += strlen(wst->name);
1818 ret += strlen(wst->uid);
1820 ret += strlen(wst->gid);
1822 ret += strlen(wst->muid);
1824 if ((proto_version == p9_proto_2000u) ||
1825 (proto_version == p9_proto_2000L)) {
1826 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1828 ret += strlen(wst->extension);
1834 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1837 struct p9_req_t *req;
1838 struct p9_client *clnt;
1842 wst->size = p9_client_statsize(wst, clnt->proto_version);
1843 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1844 p9_debug(P9_DEBUG_9P,
1845 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1846 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1847 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1848 " uid=%d gid=%d n_muid=%d\n",
1849 wst->size, wst->type, wst->dev, wst->qid.type,
1850 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1851 wst->atime, wst->mtime, (unsigned long long)wst->length,
1852 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1853 from_kuid(&init_user_ns, wst->n_uid),
1854 from_kgid(&init_user_ns, wst->n_gid),
1855 from_kuid(&init_user_ns, wst->n_muid));
1857 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1863 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1865 p9_free_req(clnt, req);
1869 EXPORT_SYMBOL(p9_client_wstat);
1871 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1874 struct p9_req_t *req;
1875 struct p9_client *clnt;
1879 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1880 p9_debug(P9_DEBUG_9P,
1881 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1882 " atime_sec=%lld atime_nsec=%lld\n"
1883 " mtime_sec=%lld mtime_nsec=%lld\n",
1884 p9attr->valid, p9attr->mode,
1885 from_kuid(&init_user_ns, p9attr->uid),
1886 from_kgid(&init_user_ns, p9attr->gid),
1887 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1888 p9attr->mtime_sec, p9attr->mtime_nsec);
1890 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1896 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1897 p9_free_req(clnt, req);
1901 EXPORT_SYMBOL(p9_client_setattr);
1903 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1906 struct p9_req_t *req;
1907 struct p9_client *clnt;
1912 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1914 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1920 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1921 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1922 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1924 trace_9p_protocol_dump(clnt, req->rc);
1925 p9_free_req(clnt, req);
1929 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1930 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1931 "fsid %llu namelen %ld\n",
1932 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1933 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1934 sb->fsid, (long int)sb->namelen);
1936 p9_free_req(clnt, req);
1940 EXPORT_SYMBOL(p9_client_statfs);
1942 int p9_client_rename(struct p9_fid *fid,
1943 struct p9_fid *newdirfid, const char *name)
1946 struct p9_req_t *req;
1947 struct p9_client *clnt;
1952 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1953 fid->fid, newdirfid->fid, name);
1955 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1956 newdirfid->fid, name);
1962 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1964 p9_free_req(clnt, req);
1968 EXPORT_SYMBOL(p9_client_rename);
1970 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1971 struct p9_fid *newdirfid, const char *new_name)
1974 struct p9_req_t *req;
1975 struct p9_client *clnt;
1978 clnt = olddirfid->clnt;
1980 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1981 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1982 newdirfid->fid, new_name);
1984 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1985 old_name, newdirfid->fid, new_name);
1991 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1992 newdirfid->fid, new_name);
1994 p9_free_req(clnt, req);
1998 EXPORT_SYMBOL(p9_client_renameat);
2001 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
2003 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
2004 const char *attr_name, u64 *attr_size)
2007 struct p9_req_t *req;
2008 struct p9_client *clnt;
2009 struct p9_fid *attr_fid;
2012 clnt = file_fid->clnt;
2013 attr_fid = p9_fid_create(clnt);
2014 if (IS_ERR(attr_fid)) {
2015 err = PTR_ERR(attr_fid);
2019 p9_debug(P9_DEBUG_9P,
2020 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2021 file_fid->fid, attr_fid->fid, attr_name);
2023 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2024 file_fid->fid, attr_fid->fid, attr_name);
2029 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
2031 trace_9p_protocol_dump(clnt, req->rc);
2032 p9_free_req(clnt, req);
2035 p9_free_req(clnt, req);
2036 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2037 attr_fid->fid, *attr_size);
2040 p9_client_clunk(attr_fid);
2043 if (attr_fid && (attr_fid != file_fid))
2044 p9_fid_destroy(attr_fid);
2046 return ERR_PTR(err);
2048 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2050 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2051 u64 attr_size, int flags)
2054 struct p9_req_t *req;
2055 struct p9_client *clnt;
2057 p9_debug(P9_DEBUG_9P,
2058 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2059 fid->fid, name, (long long)attr_size, flags);
2062 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2063 fid->fid, name, attr_size, flags);
2068 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2069 p9_free_req(clnt, req);
2073 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2075 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2077 int err, rsize, non_zc = 0;
2078 struct p9_client *clnt;
2079 struct p9_req_t *req;
2081 struct kvec kv = {.iov_base = data, .iov_len = count};
2084 iov_iter_kvec(&to, READ | ITER_KVEC, &kv, 1, count);
2086 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2087 fid->fid, (unsigned long long) offset, count);
2092 rsize = fid->iounit;
2093 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2094 rsize = clnt->msize - P9_READDIRHDRSZ;
2099 /* Don't bother zerocopy for small IO (< 1024) */
2100 if (clnt->trans_mod->zc_request && rsize > 1024) {
2102 * response header len is 11
2103 * PDU Header(7) + IO Size (4)
2105 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0,
2106 11, "dqd", fid->fid, offset, rsize);
2109 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2117 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2119 trace_9p_protocol_dump(clnt, req->rc);
2120 goto free_and_error;
2122 if (rsize < count) {
2123 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize);
2127 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2130 memmove(data, dataptr, count);
2132 p9_free_req(clnt, req);
2136 p9_free_req(clnt, req);
2140 EXPORT_SYMBOL(p9_client_readdir);
2142 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
2143 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2146 struct p9_client *clnt;
2147 struct p9_req_t *req;
2151 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2152 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2153 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2154 MAJOR(rdev), MINOR(rdev), gid);
2156 return PTR_ERR(req);
2158 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2160 trace_9p_protocol_dump(clnt, req->rc);
2163 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2164 (unsigned long long)qid->path, qid->version);
2167 p9_free_req(clnt, req);
2171 EXPORT_SYMBOL(p9_client_mknod_dotl);
2173 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
2174 kgid_t gid, struct p9_qid *qid)
2177 struct p9_client *clnt;
2178 struct p9_req_t *req;
2182 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2183 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2184 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
2187 return PTR_ERR(req);
2189 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2191 trace_9p_protocol_dump(clnt, req->rc);
2194 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2195 (unsigned long long)qid->path, qid->version);
2198 p9_free_req(clnt, req);
2202 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2204 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2207 struct p9_client *clnt;
2208 struct p9_req_t *req;
2212 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2213 "start %lld length %lld proc_id %d client_id %s\n",
2214 fid->fid, flock->type, flock->flags, flock->start,
2215 flock->length, flock->proc_id, flock->client_id);
2217 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2218 flock->flags, flock->start, flock->length,
2219 flock->proc_id, flock->client_id);
2222 return PTR_ERR(req);
2224 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2226 trace_9p_protocol_dump(clnt, req->rc);
2229 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2231 p9_free_req(clnt, req);
2235 EXPORT_SYMBOL(p9_client_lock_dotl);
2237 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2240 struct p9_client *clnt;
2241 struct p9_req_t *req;
2245 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2246 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2247 glock->start, glock->length, glock->proc_id, glock->client_id);
2249 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2250 glock->start, glock->length, glock->proc_id, glock->client_id);
2253 return PTR_ERR(req);
2255 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2256 &glock->start, &glock->length, &glock->proc_id,
2259 trace_9p_protocol_dump(clnt, req->rc);
2262 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2263 "proc_id %d client_id %s\n", glock->type, glock->start,
2264 glock->length, glock->proc_id, glock->client_id);
2266 p9_free_req(clnt, req);
2269 EXPORT_SYMBOL(p9_client_getlock_dotl);
2271 int p9_client_readlink(struct p9_fid *fid, char **target)
2274 struct p9_client *clnt;
2275 struct p9_req_t *req;
2279 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2281 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2283 return PTR_ERR(req);
2285 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2287 trace_9p_protocol_dump(clnt, req->rc);
2290 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2292 p9_free_req(clnt, req);
2295 EXPORT_SYMBOL(p9_client_readlink);