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 <net/9p/9p.h>
38 #include <linux/parser.h>
39 #include <net/9p/client.h>
40 #include <net/9p/transport.h>
43 #define CREATE_TRACE_POINTS
44 #include <trace/events/9p.h>
47 * Client Option Parsing (code inspired by NFS code)
48 * - a little lazy - parse all client options
59 static const match_table_t tokens = {
60 {Opt_msize, "msize=%u"},
61 {Opt_legacy, "noextend"},
62 {Opt_trans, "trans=%s"},
63 {Opt_version, "version=%s"},
67 inline int p9_is_proto_dotl(struct p9_client *clnt)
69 return clnt->proto_version == p9_proto_2000L;
71 EXPORT_SYMBOL(p9_is_proto_dotl);
73 inline int p9_is_proto_dotu(struct p9_client *clnt)
75 return clnt->proto_version == p9_proto_2000u;
77 EXPORT_SYMBOL(p9_is_proto_dotu);
80 * Some error codes are taken directly from the server replies,
81 * make sure they are valid.
83 static int safe_errno(int err)
85 if ((err > 0) || (err < -MAX_ERRNO)) {
86 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err);
93 /* Interpret mount option for protocol version */
94 static int get_protocol_version(char *s)
96 int version = -EINVAL;
98 if (!strcmp(s, "9p2000")) {
99 version = p9_proto_legacy;
100 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n");
101 } else if (!strcmp(s, "9p2000.u")) {
102 version = p9_proto_2000u;
103 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
104 } else if (!strcmp(s, "9p2000.L")) {
105 version = p9_proto_2000L;
106 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
108 pr_info("Unknown protocol version %s\n", s);
114 * parse_options - parse mount options into client structure
115 * @opts: options string passed from mount
116 * @clnt: existing v9fs client information
118 * Return 0 upon success, -ERRNO upon failure
121 static int parse_opts(char *opts, struct p9_client *clnt)
123 char *options, *tmp_options;
125 substring_t args[MAX_OPT_ARGS];
130 clnt->proto_version = p9_proto_2000L;
136 tmp_options = kstrdup(opts, GFP_KERNEL);
138 p9_debug(P9_DEBUG_ERROR,
139 "failed to allocate copy of option string\n");
142 options = tmp_options;
144 while ((p = strsep(&options, ",")) != NULL) {
148 token = match_token(p, tokens, args);
151 r = match_int(&args[0], &option);
153 p9_debug(P9_DEBUG_ERROR,
154 "integer field, but no integer?\n");
158 clnt->msize = option;
161 s = match_strdup(&args[0]);
164 p9_debug(P9_DEBUG_ERROR,
165 "problem allocating copy of trans arg\n");
166 goto free_and_return;
168 clnt->trans_mod = v9fs_get_trans_by_name(s);
169 if (clnt->trans_mod == NULL) {
170 pr_info("Could not find request transport: %s\n",
174 goto free_and_return;
179 clnt->proto_version = p9_proto_legacy;
182 s = match_strdup(&args[0]);
185 p9_debug(P9_DEBUG_ERROR,
186 "problem allocating copy of version arg\n");
187 goto free_and_return;
189 ret = get_protocol_version(s);
190 if (ret == -EINVAL) {
192 goto free_and_return;
195 clnt->proto_version = ret;
208 * p9_tag_alloc - lookup/allocate a request by tag
209 * @c: client session to lookup tag within
210 * @tag: numeric id for transaction
212 * this is a simple array lookup, but will grow the
213 * request_slots as necessary to accommodate transaction
214 * ids which did not previously have a slot.
216 * this code relies on the client spinlock to manage locks, its
217 * possible we should switch to something else, but I'd rather
218 * stick with something low-overhead for the common case.
222 static struct p9_req_t *
223 p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
227 struct p9_req_t *req;
228 int alloc_msize = min(c->msize, max_size);
230 /* This looks up the original request by tag so we know which
231 * buffer to read the data into */
234 if (tag >= c->max_tag) {
235 spin_lock_irqsave(&c->lock, flags);
236 /* check again since original check was outside of lock */
237 while (tag >= c->max_tag) {
238 row = (tag / P9_ROW_MAXTAG);
239 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
240 sizeof(struct p9_req_t), GFP_ATOMIC);
243 pr_err("Couldn't grow tag array\n");
244 spin_unlock_irqrestore(&c->lock, flags);
245 return ERR_PTR(-ENOMEM);
247 for (col = 0; col < P9_ROW_MAXTAG; col++) {
248 c->reqs[row][col].status = REQ_STATUS_IDLE;
249 c->reqs[row][col].tc = NULL;
251 c->max_tag += P9_ROW_MAXTAG;
253 spin_unlock_irqrestore(&c->lock, flags);
255 row = tag / P9_ROW_MAXTAG;
256 col = tag % P9_ROW_MAXTAG;
258 req = &c->reqs[row][col];
260 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
262 pr_err("Couldn't grow tag array\n");
263 return ERR_PTR(-ENOMEM);
265 init_waitqueue_head(req->wq);
266 req->tc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
268 req->rc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
270 if ((!req->tc) || (!req->rc)) {
271 pr_err("Couldn't grow tag array\n");
275 req->tc = req->rc = NULL;
277 return ERR_PTR(-ENOMEM);
279 req->tc->capacity = alloc_msize;
280 req->rc->capacity = alloc_msize;
281 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
282 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
285 p9pdu_reset(req->tc);
286 p9pdu_reset(req->rc);
288 req->tc->tag = tag-1;
289 req->status = REQ_STATUS_ALLOC;
291 return &c->reqs[row][col];
295 * p9_tag_lookup - lookup a request by tag
296 * @c: client session to lookup tag within
297 * @tag: numeric id for transaction
301 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
305 /* This looks up the original request by tag so we know which
306 * buffer to read the data into */
309 if(tag >= c->max_tag)
312 row = tag / P9_ROW_MAXTAG;
313 col = tag % P9_ROW_MAXTAG;
315 return &c->reqs[row][col];
317 EXPORT_SYMBOL(p9_tag_lookup);
320 * p9_tag_init - setup tags structure and contents
321 * @c: v9fs client struct
323 * This initializes the tags structure for each client instance.
327 static int p9_tag_init(struct p9_client *c)
331 c->tagpool = p9_idpool_create();
332 if (IS_ERR(c->tagpool)) {
333 err = PTR_ERR(c->tagpool);
336 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
338 p9_idpool_destroy(c->tagpool);
347 * p9_tag_cleanup - cleans up tags structure and reclaims resources
348 * @c: v9fs client struct
350 * This frees resources associated with the tags structure
353 static void p9_tag_cleanup(struct p9_client *c)
357 /* check to insure all requests are idle */
358 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
359 for (col = 0; col < P9_ROW_MAXTAG; col++) {
360 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
361 p9_debug(P9_DEBUG_MUX,
362 "Attempting to cleanup non-free tag %d,%d\n",
364 /* TODO: delay execution of cleanup */
371 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
372 p9_idpool_destroy(c->tagpool);
375 /* free requests associated with tags */
376 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
377 for (col = 0; col < P9_ROW_MAXTAG; col++) {
378 kfree(c->reqs[row][col].wq);
379 kfree(c->reqs[row][col].tc);
380 kfree(c->reqs[row][col].rc);
388 * p9_free_req - free a request and clean-up as necessary
390 * r: request to release
394 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
396 int tag = r->tc->tag;
397 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
399 r->status = REQ_STATUS_IDLE;
400 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
401 p9_idpool_put(tag, c->tagpool);
405 * p9_client_cb - call back from transport to client
407 * req: request received
410 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
412 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
414 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
416 EXPORT_SYMBOL(p9_client_cb);
419 * p9_parse_header - parse header arguments out of a packet
420 * @pdu: packet to parse
421 * @size: size of packet
422 * @type: type of request
423 * @tag: tag of packet
424 * @rewind: set if we need to rewind offset afterwards
428 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
434 int offset = pdu->offset;
441 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
443 goto rewind_and_exit;
449 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
450 pdu->size, pdu->id, pdu->tag);
462 pdu->offset = offset;
465 EXPORT_SYMBOL(p9_parse_header);
468 * p9_check_errors - check 9p packet for error return and process it
469 * @c: current client instance
470 * @req: request to parse and check for error conditions
472 * returns error code if one is discovered, otherwise returns 0
474 * this will have to be more complicated if we have multiple
478 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
484 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
486 * dump the response from server
487 * This should be after check errors which poplulate pdu_fcall.
489 trace_9p_protocol_dump(c, req->rc);
491 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
494 if (type != P9_RERROR && type != P9_RLERROR)
497 if (!p9_is_proto_dotl(c)) {
499 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
504 if (p9_is_proto_dotu(c))
507 if (!err || !IS_ERR_VALUE(err)) {
508 err = p9_errstr2errno(ename, strlen(ename));
510 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
515 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
518 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
524 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
530 * p9_check_zc_errors - check 9p packet for error return and process it
531 * @c: current client instance
532 * @req: request to parse and check for error conditions
533 * @in_hdrlen: Size of response protocol buffer.
535 * returns error code if one is discovered, otherwise returns 0
537 * this will have to be more complicated if we have multiple
541 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
542 char *uidata, int in_hdrlen, int kern_buf)
549 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
551 * dump the response from server
552 * This should be after parse_header which poplulate pdu_fcall.
554 trace_9p_protocol_dump(c, req->rc);
556 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
560 if (type != P9_RERROR && type != P9_RLERROR)
563 if (!p9_is_proto_dotl(c)) {
564 /* Error is reported in string format */
566 /* 7 = header size for RERROR; */
567 int inline_len = in_hdrlen - 7;
569 len = req->rc->size - req->rc->offset;
570 if (len > (P9_ZC_HDR_SZ - 7)) {
575 ename = &req->rc->sdata[req->rc->offset];
576 if (len > inline_len) {
577 /* We have error in external buffer */
579 memcpy(ename + inline_len, uidata,
582 err = copy_from_user(ename + inline_len,
583 uidata, len - inline_len);
591 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
596 if (p9_is_proto_dotu(c))
599 if (!err || !IS_ERR_VALUE(err)) {
600 err = p9_errstr2errno(ename, strlen(ename));
602 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
607 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
610 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
615 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
619 static struct p9_req_t *
620 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
623 * p9_client_flush - flush (cancel) a request
625 * @oldreq: request to cancel
627 * This sents a flush for a particular request and links
628 * the flush request to the original request. The current
629 * code only supports a single flush request although the protocol
630 * allows for multiple flush requests to be sent for a single request.
634 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
636 struct p9_req_t *req;
640 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
644 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
646 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
651 /* if we haven't received a response for oldreq,
652 remove it from the list. */
654 if (oldreq->status == REQ_STATUS_FLSH)
655 list_del(&oldreq->req_list);
656 spin_unlock(&c->lock);
662 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
663 int8_t type, int req_size,
664 const char *fmt, va_list ap)
667 struct p9_req_t *req;
669 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
671 /* we allow for any status other than disconnected */
672 if (c->status == Disconnected)
673 return ERR_PTR(-EIO);
675 /* if status is begin_disconnected we allow only clunk request */
676 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
677 return ERR_PTR(-EIO);
680 if (type != P9_TVERSION) {
681 tag = p9_idpool_get(c->tagpool);
683 return ERR_PTR(-ENOMEM);
686 req = p9_tag_alloc(c, tag, req_size);
690 /* marshall the data */
691 p9pdu_prepare(req->tc, tag, type);
692 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
695 p9pdu_finalize(c, req->tc);
696 trace_9p_client_req(c, type, tag);
704 * p9_client_rpc - issue a request and wait for a response
706 * @type: type of request
707 * @fmt: protocol format string (see protocol.c)
709 * Returns request structure (which client must free using p9_free_req)
712 static struct p9_req_t *
713 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
718 struct p9_req_t *req;
721 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
726 if (signal_pending(current)) {
728 clear_thread_flag(TIF_SIGPENDING);
732 err = c->trans_mod->request(c, req);
734 if (err != -ERESTARTSYS && err != -EFAULT)
735 c->status = Disconnected;
739 /* Wait for the response */
740 err = wait_event_interruptible(*req->wq,
741 req->status >= REQ_STATUS_RCVD);
743 if ((err == -ERESTARTSYS) && (c->status == Connected)
744 && (type == P9_TFLUSH)) {
746 clear_thread_flag(TIF_SIGPENDING);
750 if (req->status == REQ_STATUS_ERROR) {
751 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
754 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
755 p9_debug(P9_DEBUG_MUX, "flushing\n");
757 clear_thread_flag(TIF_SIGPENDING);
759 if (c->trans_mod->cancel(c, req))
760 p9_client_flush(c, req);
762 /* if we received the response anyway, don't signal error */
763 if (req->status == REQ_STATUS_RCVD)
767 spin_lock_irqsave(¤t->sighand->siglock, flags);
769 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
774 err = p9_check_errors(c, req);
775 trace_9p_client_res(c, type, req->rc->tag, err);
780 return ERR_PTR(safe_errno(err));
784 * p9_client_zc_rpc - issue a request and wait for a response
786 * @type: type of request
787 * @uidata: user bffer that should be ued for zero copy read
788 * @uodata: user buffer that shoud be user for zero copy write
789 * @inlen: read buffer size
790 * @olen: write buffer size
791 * @hdrlen: reader header size, This is the size of response protocol data
792 * @fmt: protocol format string (see protocol.c)
794 * Returns request structure (which client must free using p9_free_req)
796 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
797 char *uidata, char *uodata,
798 int inlen, int olen, int in_hdrlen,
799 int kern_buf, const char *fmt, ...)
804 struct p9_req_t *req;
808 * We allocate a inline protocol data of only 4k bytes.
809 * The actual content is passed in zero-copy fashion.
811 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
816 if (signal_pending(current)) {
818 clear_thread_flag(TIF_SIGPENDING);
822 /* If we are called with KERNEL_DS force kern_buf */
823 if (segment_eq(get_fs(), KERNEL_DS))
826 err = c->trans_mod->zc_request(c, req, uidata, uodata,
827 inlen, olen, in_hdrlen, kern_buf);
830 c->status = Disconnected;
833 if (req->status == REQ_STATUS_ERROR) {
834 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
837 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
838 p9_debug(P9_DEBUG_MUX, "flushing\n");
840 clear_thread_flag(TIF_SIGPENDING);
842 if (c->trans_mod->cancel(c, req))
843 p9_client_flush(c, req);
845 /* if we received the response anyway, don't signal error */
846 if (req->status == REQ_STATUS_RCVD)
850 spin_lock_irqsave(¤t->sighand->siglock, flags);
852 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
857 err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf);
858 trace_9p_client_res(c, type, req->rc->tag, err);
863 return ERR_PTR(safe_errno(err));
866 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
872 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
873 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
875 return ERR_PTR(-ENOMEM);
877 ret = p9_idpool_get(clnt->fidpool);
884 memset(&fid->qid, 0, sizeof(struct p9_qid));
886 fid->uid = current_fsuid();
889 spin_lock_irqsave(&clnt->lock, flags);
890 list_add(&fid->flist, &clnt->fidlist);
891 spin_unlock_irqrestore(&clnt->lock, flags);
900 static void p9_fid_destroy(struct p9_fid *fid)
902 struct p9_client *clnt;
905 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
907 p9_idpool_put(fid->fid, clnt->fidpool);
908 spin_lock_irqsave(&clnt->lock, flags);
909 list_del(&fid->flist);
910 spin_unlock_irqrestore(&clnt->lock, flags);
915 static int p9_client_version(struct p9_client *c)
918 struct p9_req_t *req;
922 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
923 c->msize, c->proto_version);
925 switch (c->proto_version) {
927 req = p9_client_rpc(c, P9_TVERSION, "ds",
928 c->msize, "9P2000.L");
931 req = p9_client_rpc(c, P9_TVERSION, "ds",
932 c->msize, "9P2000.u");
934 case p9_proto_legacy:
935 req = p9_client_rpc(c, P9_TVERSION, "ds",
946 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
948 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
949 trace_9p_protocol_dump(c, req->rc);
953 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
954 if (!strncmp(version, "9P2000.L", 8))
955 c->proto_version = p9_proto_2000L;
956 else if (!strncmp(version, "9P2000.u", 8))
957 c->proto_version = p9_proto_2000u;
958 else if (!strncmp(version, "9P2000", 6))
959 c->proto_version = p9_proto_legacy;
965 if (msize < c->msize)
975 struct p9_client *p9_client_create(const char *dev_name, char *options)
978 struct p9_client *clnt;
981 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
983 return ERR_PTR(-ENOMEM);
985 clnt->trans_mod = NULL;
987 spin_lock_init(&clnt->lock);
988 INIT_LIST_HEAD(&clnt->fidlist);
990 err = p9_tag_init(clnt);
994 err = parse_opts(options, clnt);
996 goto destroy_tagpool;
998 if (!clnt->trans_mod)
999 clnt->trans_mod = v9fs_get_trans_by_name("virtio");
1001 if (!clnt->trans_mod)
1002 clnt->trans_mod = v9fs_get_default_trans();
1004 if (clnt->trans_mod == NULL) {
1005 err = -EPROTONOSUPPORT;
1006 p9_debug(P9_DEBUG_ERROR,
1007 "No transport defined or default transport\n");
1008 goto destroy_tagpool;
1011 clnt->fidpool = p9_idpool_create();
1012 if (IS_ERR(clnt->fidpool)) {
1013 err = PTR_ERR(clnt->fidpool);
1017 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1018 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1020 err = clnt->trans_mod->create(clnt, dev_name, options);
1022 goto destroy_fidpool;
1024 if (clnt->msize > clnt->trans_mod->maxsize)
1025 clnt->msize = clnt->trans_mod->maxsize;
1027 err = p9_client_version(clnt);
1034 clnt->trans_mod->close(clnt);
1036 p9_idpool_destroy(clnt->fidpool);
1038 v9fs_put_trans(clnt->trans_mod);
1040 p9_idpool_destroy(clnt->tagpool);
1043 return ERR_PTR(err);
1045 EXPORT_SYMBOL(p9_client_create);
1047 void p9_client_destroy(struct p9_client *clnt)
1049 struct p9_fid *fid, *fidptr;
1051 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1053 if (clnt->trans_mod)
1054 clnt->trans_mod->close(clnt);
1056 v9fs_put_trans(clnt->trans_mod);
1058 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1059 pr_info("Found fid %d not clunked\n", fid->fid);
1060 p9_fid_destroy(fid);
1064 p9_idpool_destroy(clnt->fidpool);
1066 p9_tag_cleanup(clnt);
1070 EXPORT_SYMBOL(p9_client_destroy);
1072 void p9_client_disconnect(struct p9_client *clnt)
1074 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1075 clnt->status = Disconnected;
1077 EXPORT_SYMBOL(p9_client_disconnect);
1079 void p9_client_begin_disconnect(struct p9_client *clnt)
1081 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1082 clnt->status = BeginDisconnect;
1084 EXPORT_SYMBOL(p9_client_begin_disconnect);
1086 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1087 char *uname, kuid_t n_uname, char *aname)
1090 struct p9_req_t *req;
1095 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1096 afid ? afid->fid : -1, uname, aname);
1097 fid = p9_fid_create(clnt);
1104 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1105 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1111 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1113 trace_9p_protocol_dump(clnt, req->rc);
1114 p9_free_req(clnt, req);
1118 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1119 qid.type, (unsigned long long)qid.path, qid.version);
1121 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1123 p9_free_req(clnt, req);
1128 p9_fid_destroy(fid);
1129 return ERR_PTR(err);
1131 EXPORT_SYMBOL(p9_client_attach);
1133 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1134 char **wnames, int clone)
1137 struct p9_client *clnt;
1139 struct p9_qid *wqids;
1140 struct p9_req_t *req;
1141 uint16_t nwqids, count;
1145 clnt = oldfid->clnt;
1147 fid = p9_fid_create(clnt);
1154 fid->uid = oldfid->uid;
1159 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1160 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1162 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1169 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1171 trace_9p_protocol_dump(clnt, req->rc);
1172 p9_free_req(clnt, req);
1175 p9_free_req(clnt, req);
1177 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1179 if (nwqids != nwname) {
1184 for (count = 0; count < nwqids; count++)
1185 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1186 count, wqids[count].type,
1187 (unsigned long long)wqids[count].path,
1188 wqids[count].version);
1191 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1193 fid->qid = oldfid->qid;
1200 p9_client_clunk(fid);
1204 if (fid && (fid != oldfid))
1205 p9_fid_destroy(fid);
1207 return ERR_PTR(err);
1209 EXPORT_SYMBOL(p9_client_walk);
1211 int p9_client_open(struct p9_fid *fid, int mode)
1214 struct p9_client *clnt;
1215 struct p9_req_t *req;
1220 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1221 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1224 if (fid->mode != -1)
1227 if (p9_is_proto_dotl(clnt))
1228 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1230 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1236 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1238 trace_9p_protocol_dump(clnt, req->rc);
1239 goto free_and_error;
1242 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1243 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1244 (unsigned long long)qid.path, qid.version, iounit);
1247 fid->iounit = iounit;
1250 p9_free_req(clnt, req);
1254 EXPORT_SYMBOL(p9_client_open);
1256 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1257 kgid_t gid, struct p9_qid *qid)
1260 struct p9_client *clnt;
1261 struct p9_req_t *req;
1264 p9_debug(P9_DEBUG_9P,
1265 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1266 ofid->fid, name, flags, mode,
1267 from_kgid(&init_user_ns, gid));
1270 if (ofid->mode != -1)
1273 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1280 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1282 trace_9p_protocol_dump(clnt, req->rc);
1283 goto free_and_error;
1286 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1288 (unsigned long long)qid->path,
1289 qid->version, iounit);
1292 ofid->iounit = iounit;
1295 p9_free_req(clnt, req);
1299 EXPORT_SYMBOL(p9_client_create_dotl);
1301 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1305 struct p9_client *clnt;
1306 struct p9_req_t *req;
1310 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1311 fid->fid, name, perm, mode);
1315 if (fid->mode != -1)
1318 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1325 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1327 trace_9p_protocol_dump(clnt, req->rc);
1328 goto free_and_error;
1331 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1333 (unsigned long long)qid.path,
1334 qid.version, iounit);
1337 fid->iounit = iounit;
1340 p9_free_req(clnt, req);
1344 EXPORT_SYMBOL(p9_client_fcreate);
1346 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, kgid_t gid,
1350 struct p9_client *clnt;
1351 struct p9_req_t *req;
1353 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1354 dfid->fid, name, symtgt);
1357 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1364 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1366 trace_9p_protocol_dump(clnt, req->rc);
1367 goto free_and_error;
1370 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1371 qid->type, (unsigned long long)qid->path, qid->version);
1374 p9_free_req(clnt, req);
1378 EXPORT_SYMBOL(p9_client_symlink);
1380 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1382 struct p9_client *clnt;
1383 struct p9_req_t *req;
1385 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1386 dfid->fid, oldfid->fid, newname);
1388 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1391 return PTR_ERR(req);
1393 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1394 p9_free_req(clnt, req);
1397 EXPORT_SYMBOL(p9_client_link);
1399 int p9_client_fsync(struct p9_fid *fid, int datasync)
1402 struct p9_client *clnt;
1403 struct p9_req_t *req;
1405 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1406 fid->fid, datasync);
1410 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1416 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1418 p9_free_req(clnt, req);
1423 EXPORT_SYMBOL(p9_client_fsync);
1425 int p9_client_clunk(struct p9_fid *fid)
1428 struct p9_client *clnt;
1429 struct p9_req_t *req;
1433 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1434 __func__, task_pid_nr(current));
1440 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1445 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1451 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1453 p9_free_req(clnt, req);
1456 * Fid is not valid even after a failed clunk
1457 * If interrupted, retry once then give up and
1458 * leak fid until umount.
1460 if (err == -ERESTARTSYS) {
1464 p9_fid_destroy(fid);
1467 EXPORT_SYMBOL(p9_client_clunk);
1469 int p9_client_remove(struct p9_fid *fid)
1472 struct p9_client *clnt;
1473 struct p9_req_t *req;
1475 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1479 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1485 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1487 p9_free_req(clnt, req);
1489 if (err == -ERESTARTSYS)
1490 p9_client_clunk(fid);
1492 p9_fid_destroy(fid);
1495 EXPORT_SYMBOL(p9_client_remove);
1497 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1500 struct p9_req_t *req;
1501 struct p9_client *clnt;
1503 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1504 dfid->fid, name, flags);
1507 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1512 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1514 p9_free_req(clnt, req);
1518 EXPORT_SYMBOL(p9_client_unlinkat);
1521 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1526 struct p9_req_t *req;
1527 struct p9_client *clnt;
1528 int err, rsize, non_zc = 0;
1531 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1532 fid->fid, (unsigned long long) offset, count);
1536 rsize = fid->iounit;
1537 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1538 rsize = clnt->msize - P9_IOHDRSZ;
1543 /* Don't bother zerocopy for small IO (< 1024) */
1544 if (clnt->trans_mod->zc_request && rsize > 1024) {
1550 indata = (__force char *)udata;
1552 * response header len is 11
1553 * PDU Header(7) + IO Size (4)
1555 req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0,
1556 11, kernel_buf, "dqd", fid->fid,
1560 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1568 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1570 trace_9p_protocol_dump(clnt, req->rc);
1571 goto free_and_error;
1574 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1578 memmove(data, dataptr, count);
1580 err = copy_to_user(udata, dataptr, count);
1583 goto free_and_error;
1587 p9_free_req(clnt, req);
1591 p9_free_req(clnt, req);
1595 EXPORT_SYMBOL(p9_client_read);
1598 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1599 u64 offset, u32 count)
1603 struct p9_client *clnt;
1604 struct p9_req_t *req;
1606 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1607 fid->fid, (unsigned long long) offset, count);
1611 rsize = fid->iounit;
1612 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1613 rsize = clnt->msize - P9_IOHDRSZ;
1618 /* Don't bother zerocopy for small IO (< 1024) */
1619 if (clnt->trans_mod->zc_request && rsize > 1024) {
1625 odata = (char *)udata;
1626 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize,
1627 P9_ZC_HDR_SZ, kernel_buf, "dqd",
1628 fid->fid, offset, rsize);
1631 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
1632 offset, rsize, data);
1634 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
1635 offset, rsize, udata);
1642 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1644 trace_9p_protocol_dump(clnt, req->rc);
1645 goto free_and_error;
1648 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1650 p9_free_req(clnt, req);
1654 p9_free_req(clnt, req);
1658 EXPORT_SYMBOL(p9_client_write);
1660 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1663 struct p9_client *clnt;
1664 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1665 struct p9_req_t *req;
1668 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1671 return ERR_PTR(-ENOMEM);
1676 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1682 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1684 trace_9p_protocol_dump(clnt, req->rc);
1685 p9_free_req(clnt, req);
1689 p9_debug(P9_DEBUG_9P,
1690 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1691 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1692 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1693 "<<< uid=%d gid=%d n_muid=%d\n",
1694 ret->size, ret->type, ret->dev, ret->qid.type,
1695 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1696 ret->atime, ret->mtime, (unsigned long long)ret->length,
1697 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1698 from_kuid(&init_user_ns, ret->n_uid),
1699 from_kgid(&init_user_ns, ret->n_gid),
1700 from_kuid(&init_user_ns, ret->n_muid));
1702 p9_free_req(clnt, req);
1707 return ERR_PTR(err);
1709 EXPORT_SYMBOL(p9_client_stat);
1711 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1715 struct p9_client *clnt;
1716 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1718 struct p9_req_t *req;
1720 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1721 fid->fid, request_mask);
1724 return ERR_PTR(-ENOMEM);
1729 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1735 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1737 trace_9p_protocol_dump(clnt, req->rc);
1738 p9_free_req(clnt, req);
1742 p9_debug(P9_DEBUG_9P,
1743 "<<< RGETATTR st_result_mask=%lld\n"
1744 "<<< qid=%x.%llx.%x\n"
1745 "<<< st_mode=%8.8x st_nlink=%llu\n"
1746 "<<< st_uid=%d st_gid=%d\n"
1747 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1748 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1749 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1750 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1751 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1752 "<<< st_gen=%lld st_data_version=%lld",
1753 ret->st_result_mask, ret->qid.type, ret->qid.path,
1754 ret->qid.version, ret->st_mode, ret->st_nlink,
1755 from_kuid(&init_user_ns, ret->st_uid),
1756 from_kgid(&init_user_ns, ret->st_gid),
1757 ret->st_rdev, ret->st_size, ret->st_blksize,
1758 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1759 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1760 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1761 ret->st_gen, ret->st_data_version);
1763 p9_free_req(clnt, req);
1768 return ERR_PTR(err);
1770 EXPORT_SYMBOL(p9_client_getattr_dotl);
1772 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1776 /* NOTE: size shouldn't include its own length */
1777 /* size[2] type[2] dev[4] qid[13] */
1778 /* mode[4] atime[4] mtime[4] length[8]*/
1779 /* name[s] uid[s] gid[s] muid[s] */
1780 ret = 2+4+13+4+4+4+8+2+2+2+2;
1783 ret += strlen(wst->name);
1785 ret += strlen(wst->uid);
1787 ret += strlen(wst->gid);
1789 ret += strlen(wst->muid);
1791 if ((proto_version == p9_proto_2000u) ||
1792 (proto_version == p9_proto_2000L)) {
1793 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1795 ret += strlen(wst->extension);
1801 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1804 struct p9_req_t *req;
1805 struct p9_client *clnt;
1809 wst->size = p9_client_statsize(wst, clnt->proto_version);
1810 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1811 p9_debug(P9_DEBUG_9P,
1812 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1813 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1814 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1815 " uid=%d gid=%d n_muid=%d\n",
1816 wst->size, wst->type, wst->dev, wst->qid.type,
1817 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1818 wst->atime, wst->mtime, (unsigned long long)wst->length,
1819 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1820 from_kuid(&init_user_ns, wst->n_uid),
1821 from_kgid(&init_user_ns, wst->n_gid),
1822 from_kuid(&init_user_ns, wst->n_muid));
1824 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1830 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1832 p9_free_req(clnt, req);
1836 EXPORT_SYMBOL(p9_client_wstat);
1838 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1841 struct p9_req_t *req;
1842 struct p9_client *clnt;
1846 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1847 p9_debug(P9_DEBUG_9P,
1848 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1849 " atime_sec=%lld atime_nsec=%lld\n"
1850 " mtime_sec=%lld mtime_nsec=%lld\n",
1851 p9attr->valid, p9attr->mode,
1852 from_kuid(&init_user_ns, p9attr->uid),
1853 from_kgid(&init_user_ns, p9attr->gid),
1854 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1855 p9attr->mtime_sec, p9attr->mtime_nsec);
1857 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1863 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1864 p9_free_req(clnt, req);
1868 EXPORT_SYMBOL(p9_client_setattr);
1870 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1873 struct p9_req_t *req;
1874 struct p9_client *clnt;
1879 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1881 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1887 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1888 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1889 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1891 trace_9p_protocol_dump(clnt, req->rc);
1892 p9_free_req(clnt, req);
1896 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1897 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1898 "fsid %llu namelen %ld\n",
1899 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1900 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1901 sb->fsid, (long int)sb->namelen);
1903 p9_free_req(clnt, req);
1907 EXPORT_SYMBOL(p9_client_statfs);
1909 int p9_client_rename(struct p9_fid *fid,
1910 struct p9_fid *newdirfid, const char *name)
1913 struct p9_req_t *req;
1914 struct p9_client *clnt;
1919 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1920 fid->fid, newdirfid->fid, name);
1922 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1923 newdirfid->fid, name);
1929 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1931 p9_free_req(clnt, req);
1935 EXPORT_SYMBOL(p9_client_rename);
1937 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1938 struct p9_fid *newdirfid, const char *new_name)
1941 struct p9_req_t *req;
1942 struct p9_client *clnt;
1945 clnt = olddirfid->clnt;
1947 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1948 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1949 newdirfid->fid, new_name);
1951 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1952 old_name, newdirfid->fid, new_name);
1958 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1959 newdirfid->fid, new_name);
1961 p9_free_req(clnt, req);
1965 EXPORT_SYMBOL(p9_client_renameat);
1968 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1970 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1971 const char *attr_name, u64 *attr_size)
1974 struct p9_req_t *req;
1975 struct p9_client *clnt;
1976 struct p9_fid *attr_fid;
1979 clnt = file_fid->clnt;
1980 attr_fid = p9_fid_create(clnt);
1981 if (IS_ERR(attr_fid)) {
1982 err = PTR_ERR(attr_fid);
1986 p9_debug(P9_DEBUG_9P,
1987 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
1988 file_fid->fid, attr_fid->fid, attr_name);
1990 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
1991 file_fid->fid, attr_fid->fid, attr_name);
1996 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
1998 trace_9p_protocol_dump(clnt, req->rc);
1999 p9_free_req(clnt, req);
2002 p9_free_req(clnt, req);
2003 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2004 attr_fid->fid, *attr_size);
2007 p9_client_clunk(attr_fid);
2010 if (attr_fid && (attr_fid != file_fid))
2011 p9_fid_destroy(attr_fid);
2013 return ERR_PTR(err);
2015 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2017 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2018 u64 attr_size, int flags)
2021 struct p9_req_t *req;
2022 struct p9_client *clnt;
2024 p9_debug(P9_DEBUG_9P,
2025 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2026 fid->fid, name, (long long)attr_size, flags);
2029 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2030 fid->fid, name, attr_size, flags);
2035 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2036 p9_free_req(clnt, req);
2040 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2042 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2044 int err, rsize, non_zc = 0;
2045 struct p9_client *clnt;
2046 struct p9_req_t *req;
2049 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2050 fid->fid, (unsigned long long) offset, count);
2055 rsize = fid->iounit;
2056 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2057 rsize = clnt->msize - P9_READDIRHDRSZ;
2062 /* Don't bother zerocopy for small IO (< 1024) */
2063 if (clnt->trans_mod->zc_request && rsize > 1024) {
2065 * response header len is 11
2066 * PDU Header(7) + IO Size (4)
2068 req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0,
2069 11, 1, "dqd", fid->fid, offset, rsize);
2072 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2080 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2082 trace_9p_protocol_dump(clnt, req->rc);
2083 goto free_and_error;
2086 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2089 memmove(data, dataptr, count);
2091 p9_free_req(clnt, req);
2095 p9_free_req(clnt, req);
2099 EXPORT_SYMBOL(p9_client_readdir);
2101 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
2102 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2105 struct p9_client *clnt;
2106 struct p9_req_t *req;
2110 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2111 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2112 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2113 MAJOR(rdev), MINOR(rdev), gid);
2115 return PTR_ERR(req);
2117 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2119 trace_9p_protocol_dump(clnt, req->rc);
2122 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2123 (unsigned long long)qid->path, qid->version);
2126 p9_free_req(clnt, req);
2130 EXPORT_SYMBOL(p9_client_mknod_dotl);
2132 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
2133 kgid_t gid, struct p9_qid *qid)
2136 struct p9_client *clnt;
2137 struct p9_req_t *req;
2141 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2142 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2143 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
2146 return PTR_ERR(req);
2148 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2150 trace_9p_protocol_dump(clnt, req->rc);
2153 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2154 (unsigned long long)qid->path, qid->version);
2157 p9_free_req(clnt, req);
2161 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2163 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2166 struct p9_client *clnt;
2167 struct p9_req_t *req;
2171 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2172 "start %lld length %lld proc_id %d client_id %s\n",
2173 fid->fid, flock->type, flock->flags, flock->start,
2174 flock->length, flock->proc_id, flock->client_id);
2176 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2177 flock->flags, flock->start, flock->length,
2178 flock->proc_id, flock->client_id);
2181 return PTR_ERR(req);
2183 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2185 trace_9p_protocol_dump(clnt, req->rc);
2188 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2190 p9_free_req(clnt, req);
2194 EXPORT_SYMBOL(p9_client_lock_dotl);
2196 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2199 struct p9_client *clnt;
2200 struct p9_req_t *req;
2204 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2205 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2206 glock->start, glock->length, glock->proc_id, glock->client_id);
2208 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2209 glock->start, glock->length, glock->proc_id, glock->client_id);
2212 return PTR_ERR(req);
2214 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2215 &glock->start, &glock->length, &glock->proc_id,
2218 trace_9p_protocol_dump(clnt, req->rc);
2221 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2222 "proc_id %d client_id %s\n", glock->type, glock->start,
2223 glock->length, glock->proc_id, glock->client_id);
2225 p9_free_req(clnt, req);
2228 EXPORT_SYMBOL(p9_client_getlock_dotl);
2230 int p9_client_readlink(struct p9_fid *fid, char **target)
2233 struct p9_client *clnt;
2234 struct p9_req_t *req;
2238 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2240 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2242 return PTR_ERR(req);
2244 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2246 trace_9p_protocol_dump(clnt, req->rc);
2249 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2251 p9_free_req(clnt, req);
2254 EXPORT_SYMBOL(p9_client_readlink);