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);
79 /* Interpret mount option for protocol version */
80 static int get_protocol_version(char *s)
82 int version = -EINVAL;
84 if (!strcmp(s, "9p2000")) {
85 version = p9_proto_legacy;
86 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n");
87 } else if (!strcmp(s, "9p2000.u")) {
88 version = p9_proto_2000u;
89 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
90 } else if (!strcmp(s, "9p2000.L")) {
91 version = p9_proto_2000L;
92 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
94 pr_info("Unknown protocol version %s\n", s);
100 * parse_options - parse mount options into client structure
101 * @opts: options string passed from mount
102 * @clnt: existing v9fs client information
104 * Return 0 upon success, -ERRNO upon failure
107 static int parse_opts(char *opts, struct p9_client *clnt)
109 char *options, *tmp_options;
111 substring_t args[MAX_OPT_ARGS];
116 clnt->proto_version = p9_proto_2000u;
122 tmp_options = kstrdup(opts, GFP_KERNEL);
124 p9_debug(P9_DEBUG_ERROR,
125 "failed to allocate copy of option string\n");
128 options = tmp_options;
130 while ((p = strsep(&options, ",")) != NULL) {
134 token = match_token(p, tokens, args);
137 r = match_int(&args[0], &option);
139 p9_debug(P9_DEBUG_ERROR,
140 "integer field, but no integer?\n");
144 clnt->msize = option;
147 s = match_strdup(&args[0]);
150 p9_debug(P9_DEBUG_ERROR,
151 "problem allocating copy of trans arg\n");
152 goto free_and_return;
154 clnt->trans_mod = v9fs_get_trans_by_name(s);
155 if (clnt->trans_mod == NULL) {
156 pr_info("Could not find request transport: %s\n",
160 goto free_and_return;
165 clnt->proto_version = p9_proto_legacy;
168 s = match_strdup(&args[0]);
171 p9_debug(P9_DEBUG_ERROR,
172 "problem allocating copy of version arg\n");
173 goto free_and_return;
175 ret = get_protocol_version(s);
176 if (ret == -EINVAL) {
178 goto free_and_return;
181 clnt->proto_version = ret;
194 * p9_tag_alloc - lookup/allocate a request by tag
195 * @c: client session to lookup tag within
196 * @tag: numeric id for transaction
198 * this is a simple array lookup, but will grow the
199 * request_slots as necessary to accommodate transaction
200 * ids which did not previously have a slot.
202 * this code relies on the client spinlock to manage locks, its
203 * possible we should switch to something else, but I'd rather
204 * stick with something low-overhead for the common case.
208 static struct p9_req_t *
209 p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
213 struct p9_req_t *req;
214 int alloc_msize = min(c->msize, max_size);
216 /* This looks up the original request by tag so we know which
217 * buffer to read the data into */
220 if (tag >= c->max_tag) {
221 spin_lock_irqsave(&c->lock, flags);
222 /* check again since original check was outside of lock */
223 while (tag >= c->max_tag) {
224 row = (tag / P9_ROW_MAXTAG);
225 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
226 sizeof(struct p9_req_t), GFP_ATOMIC);
229 pr_err("Couldn't grow tag array\n");
230 spin_unlock_irqrestore(&c->lock, flags);
231 return ERR_PTR(-ENOMEM);
233 for (col = 0; col < P9_ROW_MAXTAG; col++) {
234 c->reqs[row][col].status = REQ_STATUS_IDLE;
235 c->reqs[row][col].tc = NULL;
237 c->max_tag += P9_ROW_MAXTAG;
239 spin_unlock_irqrestore(&c->lock, flags);
241 row = tag / P9_ROW_MAXTAG;
242 col = tag % P9_ROW_MAXTAG;
244 req = &c->reqs[row][col];
246 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
248 pr_err("Couldn't grow tag array\n");
249 return ERR_PTR(-ENOMEM);
251 init_waitqueue_head(req->wq);
252 req->tc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
254 req->rc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
256 if ((!req->tc) || (!req->rc)) {
257 pr_err("Couldn't grow tag array\n");
261 req->tc = req->rc = NULL;
263 return ERR_PTR(-ENOMEM);
265 req->tc->capacity = alloc_msize;
266 req->rc->capacity = alloc_msize;
267 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
268 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
271 p9pdu_reset(req->tc);
272 p9pdu_reset(req->rc);
274 req->tc->tag = tag-1;
275 req->status = REQ_STATUS_ALLOC;
277 return &c->reqs[row][col];
281 * p9_tag_lookup - lookup a request by tag
282 * @c: client session to lookup tag within
283 * @tag: numeric id for transaction
287 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
291 /* This looks up the original request by tag so we know which
292 * buffer to read the data into */
295 if(tag >= c->max_tag)
298 row = tag / P9_ROW_MAXTAG;
299 col = tag % P9_ROW_MAXTAG;
301 return &c->reqs[row][col];
303 EXPORT_SYMBOL(p9_tag_lookup);
306 * p9_tag_init - setup tags structure and contents
307 * @c: v9fs client struct
309 * This initializes the tags structure for each client instance.
313 static int p9_tag_init(struct p9_client *c)
317 c->tagpool = p9_idpool_create();
318 if (IS_ERR(c->tagpool)) {
319 err = PTR_ERR(c->tagpool);
322 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
324 p9_idpool_destroy(c->tagpool);
333 * p9_tag_cleanup - cleans up tags structure and reclaims resources
334 * @c: v9fs client struct
336 * This frees resources associated with the tags structure
339 static void p9_tag_cleanup(struct p9_client *c)
343 /* check to insure all requests are idle */
344 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
345 for (col = 0; col < P9_ROW_MAXTAG; col++) {
346 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
347 p9_debug(P9_DEBUG_MUX,
348 "Attempting to cleanup non-free tag %d,%d\n",
350 /* TODO: delay execution of cleanup */
357 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
358 p9_idpool_destroy(c->tagpool);
361 /* free requests associated with tags */
362 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
363 for (col = 0; col < P9_ROW_MAXTAG; col++) {
364 kfree(c->reqs[row][col].wq);
365 kfree(c->reqs[row][col].tc);
366 kfree(c->reqs[row][col].rc);
374 * p9_free_req - free a request and clean-up as necessary
376 * r: request to release
380 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
382 int tag = r->tc->tag;
383 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
385 r->status = REQ_STATUS_IDLE;
386 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
387 p9_idpool_put(tag, c->tagpool);
391 * p9_client_cb - call back from transport to client
393 * req: request received
396 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
398 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
400 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
402 EXPORT_SYMBOL(p9_client_cb);
405 * p9_parse_header - parse header arguments out of a packet
406 * @pdu: packet to parse
407 * @size: size of packet
408 * @type: type of request
409 * @tag: tag of packet
410 * @rewind: set if we need to rewind offset afterwards
414 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
420 int offset = pdu->offset;
427 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
429 goto rewind_and_exit;
435 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
436 pdu->size, pdu->id, pdu->tag);
448 pdu->offset = offset;
451 EXPORT_SYMBOL(p9_parse_header);
454 * p9_check_errors - check 9p packet for error return and process it
455 * @c: current client instance
456 * @req: request to parse and check for error conditions
458 * returns error code if one is discovered, otherwise returns 0
460 * this will have to be more complicated if we have multiple
464 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
470 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
472 * dump the response from server
473 * This should be after check errors which poplulate pdu_fcall.
475 trace_9p_protocol_dump(c, req->rc);
477 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
480 if (type != P9_RERROR && type != P9_RLERROR)
483 if (!p9_is_proto_dotl(c)) {
485 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
490 if (p9_is_proto_dotu(c))
493 if (!err || !IS_ERR_VALUE(err)) {
494 err = p9_errstr2errno(ename, strlen(ename));
496 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
501 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
504 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
510 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
516 * p9_check_zc_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
519 * @in_hdrlen: Size of response protocol buffer.
521 * returns error code if one is discovered, otherwise returns 0
523 * this will have to be more complicated if we have multiple
527 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
528 char *uidata, int in_hdrlen, int kern_buf)
535 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
537 * dump the response from server
538 * This should be after parse_header which poplulate pdu_fcall.
540 trace_9p_protocol_dump(c, req->rc);
542 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
546 if (type != P9_RERROR && type != P9_RLERROR)
549 if (!p9_is_proto_dotl(c)) {
550 /* Error is reported in string format */
552 /* 7 = header size for RERROR, 2 is the size of string len; */
553 int inline_len = in_hdrlen - (7 + 2);
555 /* Read the size of error string */
556 err = p9pdu_readf(req->rc, c->proto_version, "w", &len);
560 ename = kmalloc(len + 1, GFP_NOFS);
565 if (len <= inline_len) {
566 /* We have error in protocol buffer itself */
567 if (pdu_read(req->rc, ename, len)) {
574 * Part of the data is in user space buffer.
576 if (pdu_read(req->rc, ename, inline_len)) {
582 memcpy(ename + inline_len, uidata,
585 err = copy_from_user(ename + inline_len,
586 uidata, len - inline_len);
594 if (p9_is_proto_dotu(c)) {
595 /* For dotu we also have error code */
596 err = p9pdu_readf(req->rc,
597 c->proto_version, "d", &ecode);
602 if (!err || !IS_ERR_VALUE(err)) {
603 err = p9_errstr2errno(ename, strlen(ename));
605 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
610 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
613 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
620 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
624 static struct p9_req_t *
625 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
628 * p9_client_flush - flush (cancel) a request
630 * @oldreq: request to cancel
632 * This sents a flush for a particular request and links
633 * the flush request to the original request. The current
634 * code only supports a single flush request although the protocol
635 * allows for multiple flush requests to be sent for a single request.
639 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
641 struct p9_req_t *req;
645 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
649 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
651 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
656 /* if we haven't received a response for oldreq,
657 remove it from the list. */
659 if (oldreq->status == REQ_STATUS_FLSH)
660 list_del(&oldreq->req_list);
661 spin_unlock(&c->lock);
667 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
668 int8_t type, int req_size,
669 const char *fmt, va_list ap)
672 struct p9_req_t *req;
674 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
676 /* we allow for any status other than disconnected */
677 if (c->status == Disconnected)
678 return ERR_PTR(-EIO);
680 /* if status is begin_disconnected we allow only clunk request */
681 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
682 return ERR_PTR(-EIO);
685 if (type != P9_TVERSION) {
686 tag = p9_idpool_get(c->tagpool);
688 return ERR_PTR(-ENOMEM);
691 req = p9_tag_alloc(c, tag, req_size);
695 /* marshall the data */
696 p9pdu_prepare(req->tc, tag, type);
697 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
700 p9pdu_finalize(c, req->tc);
701 trace_9p_client_req(c, type, tag);
709 * p9_client_rpc - issue a request and wait for a response
711 * @type: type of request
712 * @fmt: protocol format string (see protocol.c)
714 * Returns request structure (which client must free using p9_free_req)
717 static struct p9_req_t *
718 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
723 struct p9_req_t *req;
726 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
731 if (signal_pending(current)) {
733 clear_thread_flag(TIF_SIGPENDING);
737 err = c->trans_mod->request(c, req);
739 if (err != -ERESTARTSYS && err != -EFAULT)
740 c->status = Disconnected;
743 /* Wait for the response */
744 err = wait_event_interruptible(*req->wq,
745 req->status >= REQ_STATUS_RCVD);
747 if (req->status == REQ_STATUS_ERROR) {
748 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
751 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
752 p9_debug(P9_DEBUG_MUX, "flushing\n");
754 clear_thread_flag(TIF_SIGPENDING);
756 if (c->trans_mod->cancel(c, req))
757 p9_client_flush(c, req);
759 /* if we received the response anyway, don't signal error */
760 if (req->status == REQ_STATUS_RCVD)
764 spin_lock_irqsave(¤t->sighand->siglock, flags);
766 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
771 err = p9_check_errors(c, req);
772 trace_9p_client_res(c, type, req->rc->tag, err);
781 * p9_client_zc_rpc - issue a request and wait for a response
783 * @type: type of request
784 * @uidata: user bffer that should be ued for zero copy read
785 * @uodata: user buffer that shoud be user for zero copy write
786 * @inlen: read buffer size
787 * @olen: write buffer size
788 * @hdrlen: reader header size, This is the size of response protocol data
789 * @fmt: protocol format string (see protocol.c)
791 * Returns request structure (which client must free using p9_free_req)
793 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
794 char *uidata, char *uodata,
795 int inlen, int olen, int in_hdrlen,
796 int kern_buf, const char *fmt, ...)
801 struct p9_req_t *req;
805 * We allocate a inline protocol data of only 4k bytes.
806 * The actual content is passed in zero-copy fashion.
808 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
813 if (signal_pending(current)) {
815 clear_thread_flag(TIF_SIGPENDING);
819 /* If we are called with KERNEL_DS force kern_buf */
820 if (segment_eq(get_fs(), KERNEL_DS))
823 err = c->trans_mod->zc_request(c, req, uidata, uodata,
824 inlen, olen, in_hdrlen, kern_buf);
827 c->status = Disconnected;
830 if (req->status == REQ_STATUS_ERROR) {
831 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
834 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
835 p9_debug(P9_DEBUG_MUX, "flushing\n");
837 clear_thread_flag(TIF_SIGPENDING);
839 if (c->trans_mod->cancel(c, req))
840 p9_client_flush(c, req);
842 /* if we received the response anyway, don't signal error */
843 if (req->status == REQ_STATUS_RCVD)
847 spin_lock_irqsave(¤t->sighand->siglock, flags);
849 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
854 err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf);
855 trace_9p_client_res(c, type, req->rc->tag, err);
863 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
869 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
870 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
872 return ERR_PTR(-ENOMEM);
874 ret = p9_idpool_get(clnt->fidpool);
881 memset(&fid->qid, 0, sizeof(struct p9_qid));
883 fid->uid = current_fsuid();
886 spin_lock_irqsave(&clnt->lock, flags);
887 list_add(&fid->flist, &clnt->fidlist);
888 spin_unlock_irqrestore(&clnt->lock, flags);
897 static void p9_fid_destroy(struct p9_fid *fid)
899 struct p9_client *clnt;
902 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
904 p9_idpool_put(fid->fid, clnt->fidpool);
905 spin_lock_irqsave(&clnt->lock, flags);
906 list_del(&fid->flist);
907 spin_unlock_irqrestore(&clnt->lock, flags);
912 static int p9_client_version(struct p9_client *c)
915 struct p9_req_t *req;
919 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
920 c->msize, c->proto_version);
922 switch (c->proto_version) {
924 req = p9_client_rpc(c, P9_TVERSION, "ds",
925 c->msize, "9P2000.L");
928 req = p9_client_rpc(c, P9_TVERSION, "ds",
929 c->msize, "9P2000.u");
931 case p9_proto_legacy:
932 req = p9_client_rpc(c, P9_TVERSION, "ds",
943 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
945 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
946 trace_9p_protocol_dump(c, req->rc);
950 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
951 if (!strncmp(version, "9P2000.L", 8))
952 c->proto_version = p9_proto_2000L;
953 else if (!strncmp(version, "9P2000.u", 8))
954 c->proto_version = p9_proto_2000u;
955 else if (!strncmp(version, "9P2000", 6))
956 c->proto_version = p9_proto_legacy;
962 if (msize < c->msize)
972 struct p9_client *p9_client_create(const char *dev_name, char *options)
975 struct p9_client *clnt;
978 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
980 return ERR_PTR(-ENOMEM);
982 clnt->trans_mod = NULL;
984 spin_lock_init(&clnt->lock);
985 INIT_LIST_HEAD(&clnt->fidlist);
987 err = p9_tag_init(clnt);
991 err = parse_opts(options, clnt);
993 goto destroy_tagpool;
995 if (!clnt->trans_mod)
996 clnt->trans_mod = v9fs_get_default_trans();
998 if (clnt->trans_mod == NULL) {
999 err = -EPROTONOSUPPORT;
1000 p9_debug(P9_DEBUG_ERROR,
1001 "No transport defined or default transport\n");
1002 goto destroy_tagpool;
1005 clnt->fidpool = p9_idpool_create();
1006 if (IS_ERR(clnt->fidpool)) {
1007 err = PTR_ERR(clnt->fidpool);
1011 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1012 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1014 err = clnt->trans_mod->create(clnt, dev_name, options);
1016 goto destroy_fidpool;
1018 if (clnt->msize > clnt->trans_mod->maxsize)
1019 clnt->msize = clnt->trans_mod->maxsize;
1021 err = p9_client_version(clnt);
1028 clnt->trans_mod->close(clnt);
1030 p9_idpool_destroy(clnt->fidpool);
1032 v9fs_put_trans(clnt->trans_mod);
1034 p9_idpool_destroy(clnt->tagpool);
1037 return ERR_PTR(err);
1039 EXPORT_SYMBOL(p9_client_create);
1041 void p9_client_destroy(struct p9_client *clnt)
1043 struct p9_fid *fid, *fidptr;
1045 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1047 if (clnt->trans_mod)
1048 clnt->trans_mod->close(clnt);
1050 v9fs_put_trans(clnt->trans_mod);
1052 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1053 pr_info("Found fid %d not clunked\n", fid->fid);
1054 p9_fid_destroy(fid);
1058 p9_idpool_destroy(clnt->fidpool);
1060 p9_tag_cleanup(clnt);
1064 EXPORT_SYMBOL(p9_client_destroy);
1066 void p9_client_disconnect(struct p9_client *clnt)
1068 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1069 clnt->status = Disconnected;
1071 EXPORT_SYMBOL(p9_client_disconnect);
1073 void p9_client_begin_disconnect(struct p9_client *clnt)
1075 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1076 clnt->status = BeginDisconnect;
1078 EXPORT_SYMBOL(p9_client_begin_disconnect);
1080 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1081 char *uname, u32 n_uname, char *aname)
1084 struct p9_req_t *req;
1089 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1090 afid ? afid->fid : -1, uname, aname);
1091 fid = p9_fid_create(clnt);
1098 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
1099 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1105 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1107 trace_9p_protocol_dump(clnt, req->rc);
1108 p9_free_req(clnt, req);
1112 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1113 qid.type, (unsigned long long)qid.path, qid.version);
1115 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1117 p9_free_req(clnt, req);
1122 p9_fid_destroy(fid);
1123 return ERR_PTR(err);
1125 EXPORT_SYMBOL(p9_client_attach);
1127 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1128 char **wnames, int clone)
1131 struct p9_client *clnt;
1133 struct p9_qid *wqids;
1134 struct p9_req_t *req;
1135 uint16_t nwqids, count;
1139 clnt = oldfid->clnt;
1141 fid = p9_fid_create(clnt);
1148 fid->uid = oldfid->uid;
1153 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1154 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1156 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1163 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1165 trace_9p_protocol_dump(clnt, req->rc);
1166 p9_free_req(clnt, req);
1169 p9_free_req(clnt, req);
1171 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1173 if (nwqids != nwname) {
1178 for (count = 0; count < nwqids; count++)
1179 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1180 count, wqids[count].type,
1181 (unsigned long long)wqids[count].path,
1182 wqids[count].version);
1185 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1187 fid->qid = oldfid->qid;
1194 p9_client_clunk(fid);
1198 if (fid && (fid != oldfid))
1199 p9_fid_destroy(fid);
1201 return ERR_PTR(err);
1203 EXPORT_SYMBOL(p9_client_walk);
1205 int p9_client_open(struct p9_fid *fid, int mode)
1208 struct p9_client *clnt;
1209 struct p9_req_t *req;
1214 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1215 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1218 if (fid->mode != -1)
1221 if (p9_is_proto_dotl(clnt))
1222 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1224 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1230 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1232 trace_9p_protocol_dump(clnt, req->rc);
1233 goto free_and_error;
1236 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1237 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1238 (unsigned long long)qid.path, qid.version, iounit);
1241 fid->iounit = iounit;
1244 p9_free_req(clnt, req);
1248 EXPORT_SYMBOL(p9_client_open);
1250 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1251 gid_t gid, struct p9_qid *qid)
1254 struct p9_client *clnt;
1255 struct p9_req_t *req;
1258 p9_debug(P9_DEBUG_9P,
1259 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1260 ofid->fid, name, flags, mode, gid);
1263 if (ofid->mode != -1)
1266 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags,
1273 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1275 trace_9p_protocol_dump(clnt, req->rc);
1276 goto free_and_error;
1279 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1281 (unsigned long long)qid->path,
1282 qid->version, iounit);
1285 ofid->iounit = iounit;
1288 p9_free_req(clnt, req);
1292 EXPORT_SYMBOL(p9_client_create_dotl);
1294 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1298 struct p9_client *clnt;
1299 struct p9_req_t *req;
1303 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1304 fid->fid, name, perm, mode);
1308 if (fid->mode != -1)
1311 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1318 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1320 trace_9p_protocol_dump(clnt, req->rc);
1321 goto free_and_error;
1324 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1326 (unsigned long long)qid.path,
1327 qid.version, iounit);
1330 fid->iounit = iounit;
1333 p9_free_req(clnt, req);
1337 EXPORT_SYMBOL(p9_client_fcreate);
1339 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid,
1343 struct p9_client *clnt;
1344 struct p9_req_t *req;
1346 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1347 dfid->fid, name, symtgt);
1350 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt,
1357 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1359 trace_9p_protocol_dump(clnt, req->rc);
1360 goto free_and_error;
1363 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1364 qid->type, (unsigned long long)qid->path, qid->version);
1367 p9_free_req(clnt, req);
1371 EXPORT_SYMBOL(p9_client_symlink);
1373 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1375 struct p9_client *clnt;
1376 struct p9_req_t *req;
1378 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1379 dfid->fid, oldfid->fid, newname);
1381 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1384 return PTR_ERR(req);
1386 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1387 p9_free_req(clnt, req);
1390 EXPORT_SYMBOL(p9_client_link);
1392 int p9_client_fsync(struct p9_fid *fid, int datasync)
1395 struct p9_client *clnt;
1396 struct p9_req_t *req;
1398 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1399 fid->fid, datasync);
1403 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1409 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1411 p9_free_req(clnt, req);
1416 EXPORT_SYMBOL(p9_client_fsync);
1418 int p9_client_clunk(struct p9_fid *fid)
1421 struct p9_client *clnt;
1422 struct p9_req_t *req;
1425 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1426 __func__, task_pid_nr(current));
1431 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1435 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1441 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1443 p9_free_req(clnt, req);
1446 * Fid is not valid even after a failed clunk
1448 p9_fid_destroy(fid);
1451 EXPORT_SYMBOL(p9_client_clunk);
1453 int p9_client_remove(struct p9_fid *fid)
1456 struct p9_client *clnt;
1457 struct p9_req_t *req;
1459 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1463 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1469 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1471 p9_free_req(clnt, req);
1473 p9_fid_destroy(fid);
1476 EXPORT_SYMBOL(p9_client_remove);
1478 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1481 struct p9_req_t *req;
1482 struct p9_client *clnt;
1484 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1485 dfid->fid, name, flags);
1488 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1493 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1495 p9_free_req(clnt, req);
1499 EXPORT_SYMBOL(p9_client_unlinkat);
1502 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1507 struct p9_req_t *req;
1508 struct p9_client *clnt;
1509 int err, rsize, non_zc = 0;
1512 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1513 fid->fid, (long long unsigned) offset, count);
1517 rsize = fid->iounit;
1518 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1519 rsize = clnt->msize - P9_IOHDRSZ;
1524 /* Don't bother zerocopy for small IO (< 1024) */
1525 if (clnt->trans_mod->zc_request && rsize > 1024) {
1531 indata = (char *)udata;
1533 * response header len is 11
1534 * PDU Header(7) + IO Size (4)
1536 req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0,
1537 11, kernel_buf, "dqd", fid->fid,
1541 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1549 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1551 trace_9p_protocol_dump(clnt, req->rc);
1552 goto free_and_error;
1555 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1559 memmove(data, dataptr, count);
1561 err = copy_to_user(udata, dataptr, count);
1564 goto free_and_error;
1568 p9_free_req(clnt, req);
1572 p9_free_req(clnt, req);
1576 EXPORT_SYMBOL(p9_client_read);
1579 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1580 u64 offset, u32 count)
1584 struct p9_client *clnt;
1585 struct p9_req_t *req;
1587 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1588 fid->fid, (long long unsigned) offset, count);
1592 rsize = fid->iounit;
1593 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1594 rsize = clnt->msize - P9_IOHDRSZ;
1599 /* Don't bother zerocopy for small IO (< 1024) */
1600 if (clnt->trans_mod->zc_request && rsize > 1024) {
1606 odata = (char *)udata;
1607 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize,
1608 P9_ZC_HDR_SZ, kernel_buf, "dqd",
1609 fid->fid, offset, rsize);
1612 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
1613 offset, rsize, data);
1615 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
1616 offset, rsize, udata);
1623 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1625 trace_9p_protocol_dump(clnt, req->rc);
1626 goto free_and_error;
1629 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1631 p9_free_req(clnt, req);
1635 p9_free_req(clnt, req);
1639 EXPORT_SYMBOL(p9_client_write);
1641 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1644 struct p9_client *clnt;
1645 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1646 struct p9_req_t *req;
1649 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1652 return ERR_PTR(-ENOMEM);
1657 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1663 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1665 trace_9p_protocol_dump(clnt, req->rc);
1666 p9_free_req(clnt, req);
1670 p9_debug(P9_DEBUG_9P,
1671 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1672 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1673 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1674 "<<< uid=%d gid=%d n_muid=%d\n",
1675 ret->size, ret->type, ret->dev, ret->qid.type,
1676 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1677 ret->atime, ret->mtime, (unsigned long long)ret->length,
1678 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1679 ret->n_uid, ret->n_gid, ret->n_muid);
1681 p9_free_req(clnt, req);
1686 return ERR_PTR(err);
1688 EXPORT_SYMBOL(p9_client_stat);
1690 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1694 struct p9_client *clnt;
1695 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1697 struct p9_req_t *req;
1699 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1700 fid->fid, request_mask);
1703 return ERR_PTR(-ENOMEM);
1708 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1714 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1716 trace_9p_protocol_dump(clnt, req->rc);
1717 p9_free_req(clnt, req);
1721 p9_debug(P9_DEBUG_9P,
1722 "<<< RGETATTR st_result_mask=%lld\n"
1723 "<<< qid=%x.%llx.%x\n"
1724 "<<< st_mode=%8.8x st_nlink=%llu\n"
1725 "<<< st_uid=%d st_gid=%d\n"
1726 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1727 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1728 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1729 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1730 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1731 "<<< st_gen=%lld st_data_version=%lld",
1732 ret->st_result_mask, ret->qid.type, ret->qid.path,
1733 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid,
1734 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize,
1735 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1736 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1737 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1738 ret->st_gen, ret->st_data_version);
1740 p9_free_req(clnt, req);
1745 return ERR_PTR(err);
1747 EXPORT_SYMBOL(p9_client_getattr_dotl);
1749 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1753 /* NOTE: size shouldn't include its own length */
1754 /* size[2] type[2] dev[4] qid[13] */
1755 /* mode[4] atime[4] mtime[4] length[8]*/
1756 /* name[s] uid[s] gid[s] muid[s] */
1757 ret = 2+4+13+4+4+4+8+2+2+2+2;
1760 ret += strlen(wst->name);
1762 ret += strlen(wst->uid);
1764 ret += strlen(wst->gid);
1766 ret += strlen(wst->muid);
1768 if ((proto_version == p9_proto_2000u) ||
1769 (proto_version == p9_proto_2000L)) {
1770 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1772 ret += strlen(wst->extension);
1778 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1781 struct p9_req_t *req;
1782 struct p9_client *clnt;
1786 wst->size = p9_client_statsize(wst, clnt->proto_version);
1787 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1788 p9_debug(P9_DEBUG_9P,
1789 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1790 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1791 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1792 " uid=%d gid=%d n_muid=%d\n",
1793 wst->size, wst->type, wst->dev, wst->qid.type,
1794 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1795 wst->atime, wst->mtime, (unsigned long long)wst->length,
1796 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1797 wst->n_uid, wst->n_gid, wst->n_muid);
1799 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1805 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1807 p9_free_req(clnt, req);
1811 EXPORT_SYMBOL(p9_client_wstat);
1813 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1816 struct p9_req_t *req;
1817 struct p9_client *clnt;
1821 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1822 p9_debug(P9_DEBUG_9P,
1823 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1824 " atime_sec=%lld atime_nsec=%lld\n"
1825 " mtime_sec=%lld mtime_nsec=%lld\n",
1826 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid,
1827 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1828 p9attr->mtime_sec, p9attr->mtime_nsec);
1830 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1836 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1837 p9_free_req(clnt, req);
1841 EXPORT_SYMBOL(p9_client_setattr);
1843 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1846 struct p9_req_t *req;
1847 struct p9_client *clnt;
1852 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1854 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1860 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1861 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1862 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1864 trace_9p_protocol_dump(clnt, req->rc);
1865 p9_free_req(clnt, req);
1869 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1870 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1871 "fsid %llu namelen %ld\n",
1872 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1873 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1874 sb->fsid, (long int)sb->namelen);
1876 p9_free_req(clnt, req);
1880 EXPORT_SYMBOL(p9_client_statfs);
1882 int p9_client_rename(struct p9_fid *fid,
1883 struct p9_fid *newdirfid, const char *name)
1886 struct p9_req_t *req;
1887 struct p9_client *clnt;
1892 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1893 fid->fid, newdirfid->fid, name);
1895 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1896 newdirfid->fid, name);
1902 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1904 p9_free_req(clnt, req);
1908 EXPORT_SYMBOL(p9_client_rename);
1910 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1911 struct p9_fid *newdirfid, const char *new_name)
1914 struct p9_req_t *req;
1915 struct p9_client *clnt;
1918 clnt = olddirfid->clnt;
1920 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1921 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1922 newdirfid->fid, new_name);
1924 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1925 old_name, newdirfid->fid, new_name);
1931 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1932 newdirfid->fid, new_name);
1934 p9_free_req(clnt, req);
1938 EXPORT_SYMBOL(p9_client_renameat);
1941 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1943 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1944 const char *attr_name, u64 *attr_size)
1947 struct p9_req_t *req;
1948 struct p9_client *clnt;
1949 struct p9_fid *attr_fid;
1952 clnt = file_fid->clnt;
1953 attr_fid = p9_fid_create(clnt);
1954 if (IS_ERR(attr_fid)) {
1955 err = PTR_ERR(attr_fid);
1959 p9_debug(P9_DEBUG_9P,
1960 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
1961 file_fid->fid, attr_fid->fid, attr_name);
1963 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
1964 file_fid->fid, attr_fid->fid, attr_name);
1969 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
1971 trace_9p_protocol_dump(clnt, req->rc);
1972 p9_free_req(clnt, req);
1975 p9_free_req(clnt, req);
1976 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
1977 attr_fid->fid, *attr_size);
1980 p9_client_clunk(attr_fid);
1983 if (attr_fid && (attr_fid != file_fid))
1984 p9_fid_destroy(attr_fid);
1986 return ERR_PTR(err);
1988 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
1990 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
1991 u64 attr_size, int flags)
1994 struct p9_req_t *req;
1995 struct p9_client *clnt;
1997 p9_debug(P9_DEBUG_9P,
1998 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
1999 fid->fid, name, (long long)attr_size, flags);
2002 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2003 fid->fid, name, attr_size, flags);
2008 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2009 p9_free_req(clnt, req);
2013 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2015 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2017 int err, rsize, non_zc = 0;
2018 struct p9_client *clnt;
2019 struct p9_req_t *req;
2022 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2023 fid->fid, (long long unsigned) offset, count);
2028 rsize = fid->iounit;
2029 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2030 rsize = clnt->msize - P9_READDIRHDRSZ;
2035 /* Don't bother zerocopy for small IO (< 1024) */
2036 if (clnt->trans_mod->zc_request && rsize > 1024) {
2038 * response header len is 11
2039 * PDU Header(7) + IO Size (4)
2041 req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0,
2042 11, 1, "dqd", fid->fid, offset, rsize);
2045 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2053 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2055 trace_9p_protocol_dump(clnt, req->rc);
2056 goto free_and_error;
2059 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2062 memmove(data, dataptr, count);
2064 p9_free_req(clnt, req);
2068 p9_free_req(clnt, req);
2072 EXPORT_SYMBOL(p9_client_readdir);
2074 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
2075 dev_t rdev, gid_t gid, struct p9_qid *qid)
2078 struct p9_client *clnt;
2079 struct p9_req_t *req;
2083 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2084 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2085 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode,
2086 MAJOR(rdev), MINOR(rdev), gid);
2088 return PTR_ERR(req);
2090 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2092 trace_9p_protocol_dump(clnt, req->rc);
2095 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2096 (unsigned long long)qid->path, qid->version);
2099 p9_free_req(clnt, req);
2103 EXPORT_SYMBOL(p9_client_mknod_dotl);
2105 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
2106 gid_t gid, struct p9_qid *qid)
2109 struct p9_client *clnt;
2110 struct p9_req_t *req;
2114 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2115 fid->fid, name, mode, gid);
2116 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode,
2119 return PTR_ERR(req);
2121 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2123 trace_9p_protocol_dump(clnt, req->rc);
2126 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2127 (unsigned long long)qid->path, qid->version);
2130 p9_free_req(clnt, req);
2134 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2136 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2139 struct p9_client *clnt;
2140 struct p9_req_t *req;
2144 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2145 "start %lld length %lld proc_id %d client_id %s\n",
2146 fid->fid, flock->type, flock->flags, flock->start,
2147 flock->length, flock->proc_id, flock->client_id);
2149 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2150 flock->flags, flock->start, flock->length,
2151 flock->proc_id, flock->client_id);
2154 return PTR_ERR(req);
2156 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2158 trace_9p_protocol_dump(clnt, req->rc);
2161 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2163 p9_free_req(clnt, req);
2167 EXPORT_SYMBOL(p9_client_lock_dotl);
2169 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2172 struct p9_client *clnt;
2173 struct p9_req_t *req;
2177 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2178 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2179 glock->start, glock->length, glock->proc_id, glock->client_id);
2181 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2182 glock->start, glock->length, glock->proc_id, glock->client_id);
2185 return PTR_ERR(req);
2187 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2188 &glock->start, &glock->length, &glock->proc_id,
2191 trace_9p_protocol_dump(clnt, req->rc);
2194 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2195 "proc_id %d client_id %s\n", glock->type, glock->start,
2196 glock->length, glock->proc_id, glock->client_id);
2198 p9_free_req(clnt, req);
2201 EXPORT_SYMBOL(p9_client_getlock_dotl);
2203 int p9_client_readlink(struct p9_fid *fid, char **target)
2206 struct p9_client *clnt;
2207 struct p9_req_t *req;
2211 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2213 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2215 return PTR_ERR(req);
2217 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2219 trace_9p_protocol_dump(clnt, req->rc);
2222 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2224 p9_free_req(clnt, req);
2227 EXPORT_SYMBOL(p9_client_readlink);