6 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
28 #include <linux/module.h>
29 #include <linux/errno.h>
31 #include <linux/poll.h>
32 #include <linux/idr.h>
33 #include <linux/mutex.h>
34 #include <linux/slab.h>
35 #include <linux/sched/signal.h>
36 #include <linux/uaccess.h>
37 #include <linux/uio.h>
38 #include <net/9p/9p.h>
39 #include <linux/parser.h>
40 #include <linux/seq_file.h>
41 #include <net/9p/client.h>
42 #include <net/9p/transport.h>
45 #define CREATE_TRACE_POINTS
46 #include <trace/events/9p.h>
49 * Client Option Parsing (code inspired by NFS code)
50 * - a little lazy - parse all client options
61 static const match_table_t tokens = {
62 {Opt_msize, "msize=%u"},
63 {Opt_legacy, "noextend"},
64 {Opt_trans, "trans=%s"},
65 {Opt_version, "version=%s"},
69 inline int p9_is_proto_dotl(struct p9_client *clnt)
71 return clnt->proto_version == p9_proto_2000L;
73 EXPORT_SYMBOL(p9_is_proto_dotl);
75 inline int p9_is_proto_dotu(struct p9_client *clnt)
77 return clnt->proto_version == p9_proto_2000u;
79 EXPORT_SYMBOL(p9_is_proto_dotu);
81 int p9_show_client_options(struct seq_file *m, struct p9_client *clnt)
83 if (clnt->msize != 8192)
84 seq_printf(m, ",msize=%u", clnt->msize);
85 seq_printf(m, ",trans=%s", clnt->trans_mod->name);
87 switch (clnt->proto_version) {
89 seq_puts(m, ",noextend");
92 seq_puts(m, ",version=9p2000.u");
99 if (clnt->trans_mod->show_options)
100 return clnt->trans_mod->show_options(m, clnt);
103 EXPORT_SYMBOL(p9_show_client_options);
106 * Some error codes are taken directly from the server replies,
107 * make sure they are valid.
109 static int safe_errno(int err)
111 if ((err > 0) || (err < -MAX_ERRNO)) {
112 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err);
119 /* Interpret mount option for protocol version */
120 static int get_protocol_version(char *s)
122 int version = -EINVAL;
124 if (!strcmp(s, "9p2000")) {
125 version = p9_proto_legacy;
126 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n");
127 } else if (!strcmp(s, "9p2000.u")) {
128 version = p9_proto_2000u;
129 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
130 } else if (!strcmp(s, "9p2000.L")) {
131 version = p9_proto_2000L;
132 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
134 pr_info("Unknown protocol version %s\n", s);
140 * parse_options - parse mount options into client structure
141 * @opts: options string passed from mount
142 * @clnt: existing v9fs client information
144 * Return 0 upon success, -ERRNO upon failure
147 static int parse_opts(char *opts, struct p9_client *clnt)
149 char *options, *tmp_options;
151 substring_t args[MAX_OPT_ARGS];
156 clnt->proto_version = p9_proto_2000L;
162 tmp_options = kstrdup(opts, GFP_KERNEL);
164 p9_debug(P9_DEBUG_ERROR,
165 "failed to allocate copy of option string\n");
168 options = tmp_options;
170 while ((p = strsep(&options, ",")) != NULL) {
174 token = match_token(p, tokens, args);
177 r = match_int(&args[0], &option);
179 p9_debug(P9_DEBUG_ERROR,
180 "integer field, but no integer?\n");
185 p9_debug(P9_DEBUG_ERROR,
186 "msize should be at least 4k\n");
190 clnt->msize = option;
193 s = match_strdup(&args[0]);
196 p9_debug(P9_DEBUG_ERROR,
197 "problem allocating copy of trans arg\n");
198 goto free_and_return;
200 clnt->trans_mod = v9fs_get_trans_by_name(s);
201 if (clnt->trans_mod == NULL) {
202 pr_info("Could not find request transport: %s\n",
206 goto free_and_return;
211 clnt->proto_version = p9_proto_legacy;
214 s = match_strdup(&args[0]);
217 p9_debug(P9_DEBUG_ERROR,
218 "problem allocating copy of version arg\n");
219 goto free_and_return;
221 ret = get_protocol_version(s);
222 if (ret == -EINVAL) {
224 goto free_and_return;
227 clnt->proto_version = ret;
239 static struct p9_fcall *p9_fcall_alloc(int alloc_msize)
242 fc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, GFP_NOFS);
245 fc->capacity = alloc_msize;
246 fc->sdata = (char *) fc + sizeof(struct p9_fcall);
251 * p9_tag_alloc - lookup/allocate a request by tag
252 * @c: client session to lookup tag within
253 * @tag: numeric id for transaction
255 * this is a simple array lookup, but will grow the
256 * request_slots as necessary to accommodate transaction
257 * ids which did not previously have a slot.
259 * this code relies on the client spinlock to manage locks, its
260 * possible we should switch to something else, but I'd rather
261 * stick with something low-overhead for the common case.
265 static struct p9_req_t *
266 p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
270 struct p9_req_t *req;
271 int alloc_msize = min(c->msize, max_size);
273 /* This looks up the original request by tag so we know which
274 * buffer to read the data into */
277 if (tag >= c->max_tag) {
278 spin_lock_irqsave(&c->lock, flags);
279 /* check again since original check was outside of lock */
280 while (tag >= c->max_tag) {
281 row = (tag / P9_ROW_MAXTAG);
282 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
283 sizeof(struct p9_req_t), GFP_ATOMIC);
286 pr_err("Couldn't grow tag array\n");
287 spin_unlock_irqrestore(&c->lock, flags);
288 return ERR_PTR(-ENOMEM);
290 for (col = 0; col < P9_ROW_MAXTAG; col++) {
291 c->reqs[row][col].status = REQ_STATUS_IDLE;
292 c->reqs[row][col].tc = NULL;
294 c->max_tag += P9_ROW_MAXTAG;
296 spin_unlock_irqrestore(&c->lock, flags);
298 row = tag / P9_ROW_MAXTAG;
299 col = tag % P9_ROW_MAXTAG;
301 req = &c->reqs[row][col];
303 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
306 init_waitqueue_head(req->wq);
310 req->tc = p9_fcall_alloc(alloc_msize);
312 req->rc = p9_fcall_alloc(alloc_msize);
313 if (!req->tc || !req->rc)
316 p9pdu_reset(req->tc);
317 p9pdu_reset(req->rc);
319 req->tc->tag = tag-1;
320 req->status = REQ_STATUS_ALLOC;
325 pr_err("Couldn't grow tag array\n");
329 req->tc = req->rc = NULL;
331 return ERR_PTR(-ENOMEM);
335 * p9_tag_lookup - lookup a request by tag
336 * @c: client session to lookup tag within
337 * @tag: numeric id for transaction
341 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
345 /* This looks up the original request by tag so we know which
346 * buffer to read the data into */
349 if(tag >= c->max_tag)
352 row = tag / P9_ROW_MAXTAG;
353 col = tag % P9_ROW_MAXTAG;
355 return &c->reqs[row][col];
357 EXPORT_SYMBOL(p9_tag_lookup);
360 * p9_tag_init - setup tags structure and contents
361 * @c: v9fs client struct
363 * This initializes the tags structure for each client instance.
367 static int p9_tag_init(struct p9_client *c)
371 c->tagpool = p9_idpool_create();
372 if (IS_ERR(c->tagpool)) {
373 err = PTR_ERR(c->tagpool);
376 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
378 p9_idpool_destroy(c->tagpool);
387 * p9_tag_cleanup - cleans up tags structure and reclaims resources
388 * @c: v9fs client struct
390 * This frees resources associated with the tags structure
393 static void p9_tag_cleanup(struct p9_client *c)
397 /* check to insure all requests are idle */
398 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
399 for (col = 0; col < P9_ROW_MAXTAG; col++) {
400 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
401 p9_debug(P9_DEBUG_MUX,
402 "Attempting to cleanup non-free tag %d,%d\n",
404 /* TODO: delay execution of cleanup */
411 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
412 p9_idpool_destroy(c->tagpool);
415 /* free requests associated with tags */
416 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
417 for (col = 0; col < P9_ROW_MAXTAG; col++) {
418 kfree(c->reqs[row][col].wq);
419 kfree(c->reqs[row][col].tc);
420 kfree(c->reqs[row][col].rc);
428 * p9_free_req - free a request and clean-up as necessary
430 * r: request to release
434 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
436 int tag = r->tc->tag;
437 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
439 r->status = REQ_STATUS_IDLE;
440 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
441 p9_idpool_put(tag, c->tagpool);
445 * p9_client_cb - call back from transport to client
447 * req: request received
450 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
452 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
455 * This barrier is needed to make sure any change made to req before
456 * the other thread wakes up will indeed be seen by the waiting side.
459 req->status = status;
462 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
464 EXPORT_SYMBOL(p9_client_cb);
467 * p9_parse_header - parse header arguments out of a packet
468 * @pdu: packet to parse
469 * @size: size of packet
470 * @type: type of request
471 * @tag: tag of packet
472 * @rewind: set if we need to rewind offset afterwards
476 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
482 int offset = pdu->offset;
489 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
491 goto rewind_and_exit;
497 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
498 pdu->size, pdu->id, pdu->tag);
510 pdu->offset = offset;
513 EXPORT_SYMBOL(p9_parse_header);
516 * p9_check_errors - check 9p packet for error return and process it
517 * @c: current client instance
518 * @req: request to parse and check for error conditions
520 * returns error code if one is discovered, otherwise returns 0
522 * this will have to be more complicated if we have multiple
526 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
532 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
534 * dump the response from server
535 * This should be after check errors which poplulate pdu_fcall.
537 trace_9p_protocol_dump(c, req->rc);
539 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
542 if (type != P9_RERROR && type != P9_RLERROR)
545 if (!p9_is_proto_dotl(c)) {
547 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
552 if (p9_is_proto_dotu(c) && ecode < 512)
556 err = p9_errstr2errno(ename, strlen(ename));
558 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
563 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
566 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
572 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
578 * p9_check_zc_errors - check 9p packet for error return and process it
579 * @c: current client instance
580 * @req: request to parse and check for error conditions
581 * @in_hdrlen: Size of response protocol buffer.
583 * returns error code if one is discovered, otherwise returns 0
585 * this will have to be more complicated if we have multiple
589 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
590 struct iov_iter *uidata, int in_hdrlen)
597 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
599 * dump the response from server
600 * This should be after parse_header which poplulate pdu_fcall.
602 trace_9p_protocol_dump(c, req->rc);
604 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
608 if (type != P9_RERROR && type != P9_RLERROR)
611 if (!p9_is_proto_dotl(c)) {
612 /* Error is reported in string format */
614 /* 7 = header size for RERROR; */
615 int inline_len = in_hdrlen - 7;
617 len = req->rc->size - req->rc->offset;
618 if (len > (P9_ZC_HDR_SZ - 7)) {
623 ename = &req->rc->sdata[req->rc->offset];
624 if (len > inline_len) {
625 /* We have error in external buffer */
626 if (!copy_from_iter_full(ename + inline_len,
627 len - inline_len, uidata)) {
633 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
638 if (p9_is_proto_dotu(c) && ecode < 512)
642 err = p9_errstr2errno(ename, strlen(ename));
644 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
649 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
652 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
657 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
661 static struct p9_req_t *
662 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
665 * p9_client_flush - flush (cancel) a request
667 * @oldreq: request to cancel
669 * This sents a flush for a particular request and links
670 * the flush request to the original request. The current
671 * code only supports a single flush request although the protocol
672 * allows for multiple flush requests to be sent for a single request.
676 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
678 struct p9_req_t *req;
682 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
686 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
688 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
693 * if we haven't received a response for oldreq,
694 * remove it from the list
696 if (oldreq->status == REQ_STATUS_SENT)
697 if (c->trans_mod->cancelled)
698 c->trans_mod->cancelled(c, oldreq);
704 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
705 int8_t type, int req_size,
706 const char *fmt, va_list ap)
709 struct p9_req_t *req;
711 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
713 /* we allow for any status other than disconnected */
714 if (c->status == Disconnected)
715 return ERR_PTR(-EIO);
717 /* if status is begin_disconnected we allow only clunk request */
718 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
719 return ERR_PTR(-EIO);
722 if (type != P9_TVERSION) {
723 tag = p9_idpool_get(c->tagpool);
725 return ERR_PTR(-ENOMEM);
728 req = p9_tag_alloc(c, tag, req_size);
732 /* marshall the data */
733 p9pdu_prepare(req->tc, tag, type);
734 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
737 p9pdu_finalize(c, req->tc);
738 trace_9p_client_req(c, type, tag);
746 * p9_client_rpc - issue a request and wait for a response
748 * @type: type of request
749 * @fmt: protocol format string (see protocol.c)
751 * Returns request structure (which client must free using p9_free_req)
754 static struct p9_req_t *
755 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
760 struct p9_req_t *req;
763 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
768 if (signal_pending(current)) {
770 clear_thread_flag(TIF_SIGPENDING);
774 err = c->trans_mod->request(c, req);
776 if (err != -ERESTARTSYS && err != -EFAULT)
777 c->status = Disconnected;
781 /* Wait for the response */
782 err = wait_event_killable(*req->wq, req->status >= REQ_STATUS_RCVD);
785 * Make sure our req is coherent with regard to updates in other
786 * threads - echoes to wmb() in the callback
790 if ((err == -ERESTARTSYS) && (c->status == Connected)
791 && (type == P9_TFLUSH)) {
793 clear_thread_flag(TIF_SIGPENDING);
797 if (req->status == REQ_STATUS_ERROR) {
798 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
801 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
802 p9_debug(P9_DEBUG_MUX, "flushing\n");
804 clear_thread_flag(TIF_SIGPENDING);
806 if (c->trans_mod->cancel(c, req))
807 p9_client_flush(c, req);
809 /* if we received the response anyway, don't signal error */
810 if (req->status == REQ_STATUS_RCVD)
814 spin_lock_irqsave(¤t->sighand->siglock, flags);
816 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
821 err = p9_check_errors(c, req);
822 trace_9p_client_res(c, type, req->rc->tag, err);
827 return ERR_PTR(safe_errno(err));
831 * p9_client_zc_rpc - issue a request and wait for a response
833 * @type: type of request
834 * @uidata: destination for zero copy read
835 * @uodata: source for zero copy write
836 * @inlen: read buffer size
837 * @olen: write buffer size
838 * @hdrlen: reader header size, This is the size of response protocol data
839 * @fmt: protocol format string (see protocol.c)
841 * Returns request structure (which client must free using p9_free_req)
843 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
844 struct iov_iter *uidata,
845 struct iov_iter *uodata,
846 int inlen, int olen, int in_hdrlen,
847 const char *fmt, ...)
852 struct p9_req_t *req;
856 * We allocate a inline protocol data of only 4k bytes.
857 * The actual content is passed in zero-copy fashion.
859 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
864 if (signal_pending(current)) {
866 clear_thread_flag(TIF_SIGPENDING);
870 err = c->trans_mod->zc_request(c, req, uidata, uodata,
871 inlen, olen, in_hdrlen);
874 c->status = Disconnected;
875 if (err != -ERESTARTSYS)
878 if (req->status == REQ_STATUS_ERROR) {
879 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
882 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
883 p9_debug(P9_DEBUG_MUX, "flushing\n");
885 clear_thread_flag(TIF_SIGPENDING);
887 if (c->trans_mod->cancel(c, req))
888 p9_client_flush(c, req);
890 /* if we received the response anyway, don't signal error */
891 if (req->status == REQ_STATUS_RCVD)
895 spin_lock_irqsave(¤t->sighand->siglock, flags);
897 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
902 err = p9_check_zc_errors(c, req, uidata, in_hdrlen);
903 trace_9p_client_res(c, type, req->rc->tag, err);
908 return ERR_PTR(safe_errno(err));
911 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
917 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
918 fid = kzalloc(sizeof(struct p9_fid), GFP_KERNEL);
920 return ERR_PTR(-ENOMEM);
922 ret = p9_idpool_get(clnt->fidpool);
930 fid->uid = current_fsuid();
932 spin_lock_irqsave(&clnt->lock, flags);
933 list_add(&fid->flist, &clnt->fidlist);
934 spin_unlock_irqrestore(&clnt->lock, flags);
943 static void p9_fid_destroy(struct p9_fid *fid)
945 struct p9_client *clnt;
948 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
950 p9_idpool_put(fid->fid, clnt->fidpool);
951 spin_lock_irqsave(&clnt->lock, flags);
952 list_del(&fid->flist);
953 spin_unlock_irqrestore(&clnt->lock, flags);
958 static int p9_client_version(struct p9_client *c)
961 struct p9_req_t *req;
962 char *version = NULL;
965 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
966 c->msize, c->proto_version);
968 switch (c->proto_version) {
970 req = p9_client_rpc(c, P9_TVERSION, "ds",
971 c->msize, "9P2000.L");
974 req = p9_client_rpc(c, P9_TVERSION, "ds",
975 c->msize, "9P2000.u");
977 case p9_proto_legacy:
978 req = p9_client_rpc(c, P9_TVERSION, "ds",
988 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
990 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
991 trace_9p_protocol_dump(c, req->rc);
995 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
996 if (!strncmp(version, "9P2000.L", 8))
997 c->proto_version = p9_proto_2000L;
998 else if (!strncmp(version, "9P2000.u", 8))
999 c->proto_version = p9_proto_2000u;
1000 else if (!strncmp(version, "9P2000", 6))
1001 c->proto_version = p9_proto_legacy;
1003 p9_debug(P9_DEBUG_ERROR,
1004 "server returned an unknown version: %s\n", version);
1010 p9_debug(P9_DEBUG_ERROR,
1011 "server returned a msize < 4096: %d\n", msize);
1015 if (msize < c->msize)
1020 p9_free_req(c, req);
1025 struct p9_client *p9_client_create(const char *dev_name, char *options)
1028 struct p9_client *clnt;
1032 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
1034 return ERR_PTR(-ENOMEM);
1036 clnt->trans_mod = NULL;
1039 client_id = utsname()->nodename;
1040 memcpy(clnt->name, client_id, strlen(client_id) + 1);
1042 spin_lock_init(&clnt->lock);
1043 INIT_LIST_HEAD(&clnt->fidlist);
1045 err = p9_tag_init(clnt);
1049 err = parse_opts(options, clnt);
1051 goto destroy_tagpool;
1053 if (!clnt->trans_mod)
1054 clnt->trans_mod = v9fs_get_default_trans();
1056 if (clnt->trans_mod == NULL) {
1057 err = -EPROTONOSUPPORT;
1058 p9_debug(P9_DEBUG_ERROR,
1059 "No transport defined or default transport\n");
1060 goto destroy_tagpool;
1063 clnt->fidpool = p9_idpool_create();
1064 if (IS_ERR(clnt->fidpool)) {
1065 err = PTR_ERR(clnt->fidpool);
1069 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1070 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1072 err = clnt->trans_mod->create(clnt, dev_name, options);
1074 goto destroy_fidpool;
1076 if (clnt->msize > clnt->trans_mod->maxsize)
1077 clnt->msize = clnt->trans_mod->maxsize;
1079 if (clnt->msize < 4096) {
1080 p9_debug(P9_DEBUG_ERROR,
1081 "Please specify a msize of at least 4k\n");
1086 err = p9_client_version(clnt);
1093 clnt->trans_mod->close(clnt);
1095 p9_idpool_destroy(clnt->fidpool);
1097 v9fs_put_trans(clnt->trans_mod);
1099 p9_idpool_destroy(clnt->tagpool);
1102 return ERR_PTR(err);
1104 EXPORT_SYMBOL(p9_client_create);
1106 void p9_client_destroy(struct p9_client *clnt)
1108 struct p9_fid *fid, *fidptr;
1110 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1112 if (clnt->trans_mod)
1113 clnt->trans_mod->close(clnt);
1115 v9fs_put_trans(clnt->trans_mod);
1117 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1118 pr_info("Found fid %d not clunked\n", fid->fid);
1119 p9_fid_destroy(fid);
1123 p9_idpool_destroy(clnt->fidpool);
1125 p9_tag_cleanup(clnt);
1129 EXPORT_SYMBOL(p9_client_destroy);
1131 void p9_client_disconnect(struct p9_client *clnt)
1133 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1134 clnt->status = Disconnected;
1136 EXPORT_SYMBOL(p9_client_disconnect);
1138 void p9_client_begin_disconnect(struct p9_client *clnt)
1140 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1141 clnt->status = BeginDisconnect;
1143 EXPORT_SYMBOL(p9_client_begin_disconnect);
1145 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1146 const char *uname, kuid_t n_uname, const char *aname)
1149 struct p9_req_t *req;
1154 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1155 afid ? afid->fid : -1, uname, aname);
1156 fid = p9_fid_create(clnt);
1164 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1165 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1171 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1173 trace_9p_protocol_dump(clnt, req->rc);
1174 p9_free_req(clnt, req);
1178 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1179 qid.type, (unsigned long long)qid.path, qid.version);
1181 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1183 p9_free_req(clnt, req);
1188 p9_fid_destroy(fid);
1189 return ERR_PTR(err);
1191 EXPORT_SYMBOL(p9_client_attach);
1193 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1194 const unsigned char * const *wnames, int clone)
1197 struct p9_client *clnt;
1199 struct p9_qid *wqids;
1200 struct p9_req_t *req;
1201 uint16_t nwqids, count;
1205 clnt = oldfid->clnt;
1207 fid = p9_fid_create(clnt);
1214 fid->uid = oldfid->uid;
1219 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1220 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1222 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1229 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1231 trace_9p_protocol_dump(clnt, req->rc);
1232 p9_free_req(clnt, req);
1235 p9_free_req(clnt, req);
1237 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1239 if (nwqids != nwname) {
1244 for (count = 0; count < nwqids; count++)
1245 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1246 count, wqids[count].type,
1247 (unsigned long long)wqids[count].path,
1248 wqids[count].version);
1251 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1253 fid->qid = oldfid->qid;
1260 p9_client_clunk(fid);
1264 if (fid && (fid != oldfid))
1265 p9_fid_destroy(fid);
1267 return ERR_PTR(err);
1269 EXPORT_SYMBOL(p9_client_walk);
1271 int p9_client_open(struct p9_fid *fid, int mode)
1274 struct p9_client *clnt;
1275 struct p9_req_t *req;
1280 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1281 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1284 if (fid->mode != -1)
1287 if (p9_is_proto_dotl(clnt))
1288 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1290 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1296 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1298 trace_9p_protocol_dump(clnt, req->rc);
1299 goto free_and_error;
1302 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1303 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1304 (unsigned long long)qid.path, qid.version, iounit);
1307 fid->iounit = iounit;
1310 p9_free_req(clnt, req);
1314 EXPORT_SYMBOL(p9_client_open);
1316 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode,
1317 kgid_t gid, struct p9_qid *qid)
1320 struct p9_client *clnt;
1321 struct p9_req_t *req;
1324 p9_debug(P9_DEBUG_9P,
1325 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1326 ofid->fid, name, flags, mode,
1327 from_kgid(&init_user_ns, gid));
1330 if (ofid->mode != -1)
1333 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1340 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1342 trace_9p_protocol_dump(clnt, req->rc);
1343 goto free_and_error;
1346 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1348 (unsigned long long)qid->path,
1349 qid->version, iounit);
1352 ofid->iounit = iounit;
1355 p9_free_req(clnt, req);
1359 EXPORT_SYMBOL(p9_client_create_dotl);
1361 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode,
1365 struct p9_client *clnt;
1366 struct p9_req_t *req;
1370 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1371 fid->fid, name, perm, mode);
1375 if (fid->mode != -1)
1378 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1385 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1387 trace_9p_protocol_dump(clnt, req->rc);
1388 goto free_and_error;
1391 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1393 (unsigned long long)qid.path,
1394 qid.version, iounit);
1397 fid->iounit = iounit;
1400 p9_free_req(clnt, req);
1404 EXPORT_SYMBOL(p9_client_fcreate);
1406 int p9_client_symlink(struct p9_fid *dfid, const char *name,
1407 const char *symtgt, kgid_t gid, struct p9_qid *qid)
1410 struct p9_client *clnt;
1411 struct p9_req_t *req;
1413 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1414 dfid->fid, name, symtgt);
1417 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1424 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1426 trace_9p_protocol_dump(clnt, req->rc);
1427 goto free_and_error;
1430 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1431 qid->type, (unsigned long long)qid->path, qid->version);
1434 p9_free_req(clnt, req);
1438 EXPORT_SYMBOL(p9_client_symlink);
1440 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname)
1442 struct p9_client *clnt;
1443 struct p9_req_t *req;
1445 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1446 dfid->fid, oldfid->fid, newname);
1448 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1451 return PTR_ERR(req);
1453 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1454 p9_free_req(clnt, req);
1457 EXPORT_SYMBOL(p9_client_link);
1459 int p9_client_fsync(struct p9_fid *fid, int datasync)
1462 struct p9_client *clnt;
1463 struct p9_req_t *req;
1465 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1466 fid->fid, datasync);
1470 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1476 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1478 p9_free_req(clnt, req);
1483 EXPORT_SYMBOL(p9_client_fsync);
1485 int p9_client_clunk(struct p9_fid *fid)
1488 struct p9_client *clnt;
1489 struct p9_req_t *req;
1493 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1494 __func__, task_pid_nr(current));
1500 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1505 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1511 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1513 p9_free_req(clnt, req);
1516 * Fid is not valid even after a failed clunk
1517 * If interrupted, retry once then give up and
1518 * leak fid until umount.
1520 if (err == -ERESTARTSYS) {
1524 p9_fid_destroy(fid);
1527 EXPORT_SYMBOL(p9_client_clunk);
1529 int p9_client_remove(struct p9_fid *fid)
1532 struct p9_client *clnt;
1533 struct p9_req_t *req;
1535 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1539 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1545 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1547 p9_free_req(clnt, req);
1549 if (err == -ERESTARTSYS)
1550 p9_client_clunk(fid);
1552 p9_fid_destroy(fid);
1555 EXPORT_SYMBOL(p9_client_remove);
1557 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1560 struct p9_req_t *req;
1561 struct p9_client *clnt;
1563 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1564 dfid->fid, name, flags);
1567 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1572 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1574 p9_free_req(clnt, req);
1578 EXPORT_SYMBOL(p9_client_unlinkat);
1581 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
1583 struct p9_client *clnt = fid->clnt;
1584 struct p9_req_t *req;
1588 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1589 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to));
1591 while (iov_iter_count(to)) {
1592 int count = iov_iter_count(to);
1593 int rsize, non_zc = 0;
1596 rsize = fid->iounit;
1597 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1598 rsize = clnt->msize - P9_IOHDRSZ;
1603 /* Don't bother zerocopy for small IO (< 1024) */
1604 if (clnt->trans_mod->zc_request && rsize > 1024) {
1606 * response header len is 11
1607 * PDU Header(7) + IO Size (4)
1609 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize,
1610 0, 11, "dqd", fid->fid,
1614 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1618 *err = PTR_ERR(req);
1622 *err = p9pdu_readf(req->rc, clnt->proto_version,
1623 "D", &count, &dataptr);
1625 trace_9p_protocol_dump(clnt, req->rc);
1626 p9_free_req(clnt, req);
1629 if (rsize < count) {
1630 pr_err("bogus RREAD count (%d > %d)\n", count, rsize);
1634 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1636 p9_free_req(clnt, req);
1641 int n = copy_to_iter(dataptr, count, to);
1646 p9_free_req(clnt, req);
1650 iov_iter_advance(to, count);
1654 p9_free_req(clnt, req);
1658 EXPORT_SYMBOL(p9_client_read);
1661 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
1663 struct p9_client *clnt = fid->clnt;
1664 struct p9_req_t *req;
1668 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n",
1669 fid->fid, (unsigned long long) offset,
1670 iov_iter_count(from));
1672 while (iov_iter_count(from)) {
1673 int count = iov_iter_count(from);
1674 int rsize = fid->iounit;
1675 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1676 rsize = clnt->msize - P9_IOHDRSZ;
1681 /* Don't bother zerocopy for small IO (< 1024) */
1682 if (clnt->trans_mod->zc_request && rsize > 1024) {
1683 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
1684 rsize, P9_ZC_HDR_SZ, "dqd",
1685 fid->fid, offset, rsize);
1687 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
1688 offset, rsize, from);
1691 *err = PTR_ERR(req);
1695 *err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1697 trace_9p_protocol_dump(clnt, req->rc);
1698 p9_free_req(clnt, req);
1701 if (rsize < count) {
1702 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize);
1706 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1708 p9_free_req(clnt, req);
1709 iov_iter_advance(from, count);
1715 EXPORT_SYMBOL(p9_client_write);
1717 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1720 struct p9_client *clnt;
1721 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1722 struct p9_req_t *req;
1725 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1728 return ERR_PTR(-ENOMEM);
1733 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1739 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1741 trace_9p_protocol_dump(clnt, req->rc);
1742 p9_free_req(clnt, req);
1746 p9_debug(P9_DEBUG_9P,
1747 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1748 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1749 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1750 "<<< uid=%d gid=%d n_muid=%d\n",
1751 ret->size, ret->type, ret->dev, ret->qid.type,
1752 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1753 ret->atime, ret->mtime, (unsigned long long)ret->length,
1754 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1755 from_kuid(&init_user_ns, ret->n_uid),
1756 from_kgid(&init_user_ns, ret->n_gid),
1757 from_kuid(&init_user_ns, ret->n_muid));
1759 p9_free_req(clnt, req);
1764 return ERR_PTR(err);
1766 EXPORT_SYMBOL(p9_client_stat);
1768 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1772 struct p9_client *clnt;
1773 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1775 struct p9_req_t *req;
1777 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1778 fid->fid, request_mask);
1781 return ERR_PTR(-ENOMEM);
1786 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1792 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1794 trace_9p_protocol_dump(clnt, req->rc);
1795 p9_free_req(clnt, req);
1799 p9_debug(P9_DEBUG_9P,
1800 "<<< RGETATTR st_result_mask=%lld\n"
1801 "<<< qid=%x.%llx.%x\n"
1802 "<<< st_mode=%8.8x st_nlink=%llu\n"
1803 "<<< st_uid=%d st_gid=%d\n"
1804 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1805 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1806 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1807 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1808 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1809 "<<< st_gen=%lld st_data_version=%lld",
1810 ret->st_result_mask, ret->qid.type, ret->qid.path,
1811 ret->qid.version, ret->st_mode, ret->st_nlink,
1812 from_kuid(&init_user_ns, ret->st_uid),
1813 from_kgid(&init_user_ns, ret->st_gid),
1814 ret->st_rdev, ret->st_size, ret->st_blksize,
1815 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1816 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1817 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1818 ret->st_gen, ret->st_data_version);
1820 p9_free_req(clnt, req);
1825 return ERR_PTR(err);
1827 EXPORT_SYMBOL(p9_client_getattr_dotl);
1829 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1833 /* NOTE: size shouldn't include its own length */
1834 /* size[2] type[2] dev[4] qid[13] */
1835 /* mode[4] atime[4] mtime[4] length[8]*/
1836 /* name[s] uid[s] gid[s] muid[s] */
1837 ret = 2+4+13+4+4+4+8+2+2+2+2;
1840 ret += strlen(wst->name);
1842 ret += strlen(wst->uid);
1844 ret += strlen(wst->gid);
1846 ret += strlen(wst->muid);
1848 if ((proto_version == p9_proto_2000u) ||
1849 (proto_version == p9_proto_2000L)) {
1850 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1852 ret += strlen(wst->extension);
1858 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1861 struct p9_req_t *req;
1862 struct p9_client *clnt;
1866 wst->size = p9_client_statsize(wst, clnt->proto_version);
1867 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1868 p9_debug(P9_DEBUG_9P,
1869 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1870 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1871 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1872 " uid=%d gid=%d n_muid=%d\n",
1873 wst->size, wst->type, wst->dev, wst->qid.type,
1874 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1875 wst->atime, wst->mtime, (unsigned long long)wst->length,
1876 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1877 from_kuid(&init_user_ns, wst->n_uid),
1878 from_kgid(&init_user_ns, wst->n_gid),
1879 from_kuid(&init_user_ns, wst->n_muid));
1881 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1887 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1889 p9_free_req(clnt, req);
1893 EXPORT_SYMBOL(p9_client_wstat);
1895 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1898 struct p9_req_t *req;
1899 struct p9_client *clnt;
1903 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1904 p9_debug(P9_DEBUG_9P,
1905 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1906 " atime_sec=%lld atime_nsec=%lld\n"
1907 " mtime_sec=%lld mtime_nsec=%lld\n",
1908 p9attr->valid, p9attr->mode,
1909 from_kuid(&init_user_ns, p9attr->uid),
1910 from_kgid(&init_user_ns, p9attr->gid),
1911 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1912 p9attr->mtime_sec, p9attr->mtime_nsec);
1914 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1920 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1921 p9_free_req(clnt, req);
1925 EXPORT_SYMBOL(p9_client_setattr);
1927 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1930 struct p9_req_t *req;
1931 struct p9_client *clnt;
1936 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1938 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1944 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1945 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1946 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1948 trace_9p_protocol_dump(clnt, req->rc);
1949 p9_free_req(clnt, req);
1953 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1954 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1955 "fsid %llu namelen %ld\n",
1956 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1957 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1958 sb->fsid, (long int)sb->namelen);
1960 p9_free_req(clnt, req);
1964 EXPORT_SYMBOL(p9_client_statfs);
1966 int p9_client_rename(struct p9_fid *fid,
1967 struct p9_fid *newdirfid, const char *name)
1970 struct p9_req_t *req;
1971 struct p9_client *clnt;
1976 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1977 fid->fid, newdirfid->fid, name);
1979 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1980 newdirfid->fid, name);
1986 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1988 p9_free_req(clnt, req);
1992 EXPORT_SYMBOL(p9_client_rename);
1994 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1995 struct p9_fid *newdirfid, const char *new_name)
1998 struct p9_req_t *req;
1999 struct p9_client *clnt;
2002 clnt = olddirfid->clnt;
2004 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
2005 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
2006 newdirfid->fid, new_name);
2008 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
2009 old_name, newdirfid->fid, new_name);
2015 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
2016 newdirfid->fid, new_name);
2018 p9_free_req(clnt, req);
2022 EXPORT_SYMBOL(p9_client_renameat);
2025 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
2027 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
2028 const char *attr_name, u64 *attr_size)
2031 struct p9_req_t *req;
2032 struct p9_client *clnt;
2033 struct p9_fid *attr_fid;
2036 clnt = file_fid->clnt;
2037 attr_fid = p9_fid_create(clnt);
2038 if (IS_ERR(attr_fid)) {
2039 err = PTR_ERR(attr_fid);
2043 p9_debug(P9_DEBUG_9P,
2044 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2045 file_fid->fid, attr_fid->fid, attr_name);
2047 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2048 file_fid->fid, attr_fid->fid, attr_name);
2053 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
2055 trace_9p_protocol_dump(clnt, req->rc);
2056 p9_free_req(clnt, req);
2059 p9_free_req(clnt, req);
2060 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2061 attr_fid->fid, *attr_size);
2064 p9_client_clunk(attr_fid);
2067 if (attr_fid && (attr_fid != file_fid))
2068 p9_fid_destroy(attr_fid);
2070 return ERR_PTR(err);
2072 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2074 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2075 u64 attr_size, int flags)
2078 struct p9_req_t *req;
2079 struct p9_client *clnt;
2081 p9_debug(P9_DEBUG_9P,
2082 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2083 fid->fid, name, (long long)attr_size, flags);
2086 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2087 fid->fid, name, attr_size, flags);
2092 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2093 p9_free_req(clnt, req);
2097 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2099 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2101 int err, rsize, non_zc = 0;
2102 struct p9_client *clnt;
2103 struct p9_req_t *req;
2105 struct kvec kv = {.iov_base = data, .iov_len = count};
2108 iov_iter_kvec(&to, READ | ITER_KVEC, &kv, 1, count);
2110 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2111 fid->fid, (unsigned long long) offset, count);
2116 rsize = fid->iounit;
2117 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2118 rsize = clnt->msize - P9_READDIRHDRSZ;
2123 /* Don't bother zerocopy for small IO (< 1024) */
2124 if (clnt->trans_mod->zc_request && rsize > 1024) {
2126 * response header len is 11
2127 * PDU Header(7) + IO Size (4)
2129 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0,
2130 11, "dqd", fid->fid, offset, rsize);
2133 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2141 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2143 trace_9p_protocol_dump(clnt, req->rc);
2144 goto free_and_error;
2146 if (rsize < count) {
2147 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize);
2151 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2154 memmove(data, dataptr, count);
2156 p9_free_req(clnt, req);
2160 p9_free_req(clnt, req);
2164 EXPORT_SYMBOL(p9_client_readdir);
2166 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode,
2167 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2170 struct p9_client *clnt;
2171 struct p9_req_t *req;
2175 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2176 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2177 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2178 MAJOR(rdev), MINOR(rdev), gid);
2180 return PTR_ERR(req);
2182 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2184 trace_9p_protocol_dump(clnt, req->rc);
2187 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2188 (unsigned long long)qid->path, qid->version);
2191 p9_free_req(clnt, req);
2195 EXPORT_SYMBOL(p9_client_mknod_dotl);
2197 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode,
2198 kgid_t gid, struct p9_qid *qid)
2201 struct p9_client *clnt;
2202 struct p9_req_t *req;
2206 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2207 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2208 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
2211 return PTR_ERR(req);
2213 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2215 trace_9p_protocol_dump(clnt, req->rc);
2218 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2219 (unsigned long long)qid->path, qid->version);
2222 p9_free_req(clnt, req);
2226 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2228 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2231 struct p9_client *clnt;
2232 struct p9_req_t *req;
2236 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2237 "start %lld length %lld proc_id %d client_id %s\n",
2238 fid->fid, flock->type, flock->flags, flock->start,
2239 flock->length, flock->proc_id, flock->client_id);
2241 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2242 flock->flags, flock->start, flock->length,
2243 flock->proc_id, flock->client_id);
2246 return PTR_ERR(req);
2248 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2250 trace_9p_protocol_dump(clnt, req->rc);
2253 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2255 p9_free_req(clnt, req);
2259 EXPORT_SYMBOL(p9_client_lock_dotl);
2261 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2264 struct p9_client *clnt;
2265 struct p9_req_t *req;
2269 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2270 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2271 glock->start, glock->length, glock->proc_id, glock->client_id);
2273 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2274 glock->start, glock->length, glock->proc_id, glock->client_id);
2277 return PTR_ERR(req);
2279 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2280 &glock->start, &glock->length, &glock->proc_id,
2283 trace_9p_protocol_dump(clnt, req->rc);
2286 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2287 "proc_id %d client_id %s\n", glock->type, glock->start,
2288 glock->length, glock->proc_id, glock->client_id);
2290 p9_free_req(clnt, req);
2293 EXPORT_SYMBOL(p9_client_getlock_dotl);
2295 int p9_client_readlink(struct p9_fid *fid, char **target)
2298 struct p9_client *clnt;
2299 struct p9_req_t *req;
2303 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2305 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2307 return PTR_ERR(req);
2309 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2311 trace_9p_protocol_dump(clnt, req->rc);
2314 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2316 p9_free_req(clnt, req);
2319 EXPORT_SYMBOL(p9_client_readlink);