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;
207 static struct p9_fcall *p9_fcall_alloc(int alloc_msize)
210 fc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, GFP_NOFS);
213 fc->capacity = alloc_msize;
214 fc->sdata = (char *) fc + sizeof(struct p9_fcall);
219 * p9_tag_alloc - lookup/allocate a request by tag
220 * @c: client session to lookup tag within
221 * @tag: numeric id for transaction
223 * this is a simple array lookup, but will grow the
224 * request_slots as necessary to accommodate transaction
225 * ids which did not previously have a slot.
227 * this code relies on the client spinlock to manage locks, its
228 * possible we should switch to something else, but I'd rather
229 * stick with something low-overhead for the common case.
233 static struct p9_req_t *
234 p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
238 struct p9_req_t *req;
239 int alloc_msize = min(c->msize, max_size);
241 /* This looks up the original request by tag so we know which
242 * buffer to read the data into */
245 if (tag >= c->max_tag) {
246 spin_lock_irqsave(&c->lock, flags);
247 /* check again since original check was outside of lock */
248 while (tag >= c->max_tag) {
249 row = (tag / P9_ROW_MAXTAG);
250 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
251 sizeof(struct p9_req_t), GFP_ATOMIC);
254 pr_err("Couldn't grow tag array\n");
255 spin_unlock_irqrestore(&c->lock, flags);
256 return ERR_PTR(-ENOMEM);
258 for (col = 0; col < P9_ROW_MAXTAG; col++) {
259 c->reqs[row][col].status = REQ_STATUS_IDLE;
260 c->reqs[row][col].tc = NULL;
262 c->max_tag += P9_ROW_MAXTAG;
264 spin_unlock_irqrestore(&c->lock, flags);
266 row = tag / P9_ROW_MAXTAG;
267 col = tag % P9_ROW_MAXTAG;
269 req = &c->reqs[row][col];
271 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
274 init_waitqueue_head(req->wq);
278 req->tc = p9_fcall_alloc(alloc_msize);
280 req->rc = p9_fcall_alloc(alloc_msize);
281 if (!req->tc || !req->rc)
284 p9pdu_reset(req->tc);
285 p9pdu_reset(req->rc);
287 req->tc->tag = tag-1;
288 req->status = REQ_STATUS_ALLOC;
293 pr_err("Couldn't grow tag array\n");
297 req->tc = req->rc = NULL;
299 return ERR_PTR(-ENOMEM);
303 * p9_tag_lookup - lookup a request by tag
304 * @c: client session to lookup tag within
305 * @tag: numeric id for transaction
309 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
313 /* This looks up the original request by tag so we know which
314 * buffer to read the data into */
317 if(tag >= c->max_tag)
320 row = tag / P9_ROW_MAXTAG;
321 col = tag % P9_ROW_MAXTAG;
323 return &c->reqs[row][col];
325 EXPORT_SYMBOL(p9_tag_lookup);
328 * p9_tag_init - setup tags structure and contents
329 * @c: v9fs client struct
331 * This initializes the tags structure for each client instance.
335 static int p9_tag_init(struct p9_client *c)
339 c->tagpool = p9_idpool_create();
340 if (IS_ERR(c->tagpool)) {
341 err = PTR_ERR(c->tagpool);
344 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
346 p9_idpool_destroy(c->tagpool);
355 * p9_tag_cleanup - cleans up tags structure and reclaims resources
356 * @c: v9fs client struct
358 * This frees resources associated with the tags structure
361 static void p9_tag_cleanup(struct p9_client *c)
365 /* check to insure all requests are idle */
366 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
367 for (col = 0; col < P9_ROW_MAXTAG; col++) {
368 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
369 p9_debug(P9_DEBUG_MUX,
370 "Attempting to cleanup non-free tag %d,%d\n",
372 /* TODO: delay execution of cleanup */
379 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
380 p9_idpool_destroy(c->tagpool);
383 /* free requests associated with tags */
384 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
385 for (col = 0; col < P9_ROW_MAXTAG; col++) {
386 kfree(c->reqs[row][col].wq);
387 kfree(c->reqs[row][col].tc);
388 kfree(c->reqs[row][col].rc);
396 * p9_free_req - free a request and clean-up as necessary
398 * r: request to release
402 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
404 int tag = r->tc->tag;
405 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
407 r->status = REQ_STATUS_IDLE;
408 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
409 p9_idpool_put(tag, c->tagpool);
413 * p9_client_cb - call back from transport to client
415 * req: request received
418 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
420 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
422 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
424 EXPORT_SYMBOL(p9_client_cb);
427 * p9_parse_header - parse header arguments out of a packet
428 * @pdu: packet to parse
429 * @size: size of packet
430 * @type: type of request
431 * @tag: tag of packet
432 * @rewind: set if we need to rewind offset afterwards
436 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
442 int offset = pdu->offset;
449 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
451 goto rewind_and_exit;
457 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
458 pdu->size, pdu->id, pdu->tag);
470 pdu->offset = offset;
473 EXPORT_SYMBOL(p9_parse_header);
476 * p9_check_errors - check 9p packet for error return and process it
477 * @c: current client instance
478 * @req: request to parse and check for error conditions
480 * returns error code if one is discovered, otherwise returns 0
482 * this will have to be more complicated if we have multiple
486 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
492 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
494 * dump the response from server
495 * This should be after check errors which poplulate pdu_fcall.
497 trace_9p_protocol_dump(c, req->rc);
499 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
502 if (type != P9_RERROR && type != P9_RLERROR)
505 if (!p9_is_proto_dotl(c)) {
507 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
512 if (p9_is_proto_dotu(c))
515 if (!err || !IS_ERR_VALUE(err)) {
516 err = p9_errstr2errno(ename, strlen(ename));
518 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
523 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
526 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
532 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
538 * p9_check_zc_errors - check 9p packet for error return and process it
539 * @c: current client instance
540 * @req: request to parse and check for error conditions
541 * @in_hdrlen: Size of response protocol buffer.
543 * returns error code if one is discovered, otherwise returns 0
545 * this will have to be more complicated if we have multiple
549 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
550 char *uidata, int in_hdrlen, int kern_buf)
557 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
559 * dump the response from server
560 * This should be after parse_header which poplulate pdu_fcall.
562 trace_9p_protocol_dump(c, req->rc);
564 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
568 if (type != P9_RERROR && type != P9_RLERROR)
571 if (!p9_is_proto_dotl(c)) {
572 /* Error is reported in string format */
574 /* 7 = header size for RERROR; */
575 int inline_len = in_hdrlen - 7;
577 len = req->rc->size - req->rc->offset;
578 if (len > (P9_ZC_HDR_SZ - 7)) {
583 ename = &req->rc->sdata[req->rc->offset];
584 if (len > inline_len) {
585 /* We have error in external buffer */
587 memcpy(ename + inline_len, uidata,
590 err = copy_from_user(ename + inline_len,
591 uidata, len - inline_len);
599 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
604 if (p9_is_proto_dotu(c))
607 if (!err || !IS_ERR_VALUE(err)) {
608 err = p9_errstr2errno(ename, strlen(ename));
610 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
615 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
618 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
623 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
627 static struct p9_req_t *
628 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
631 * p9_client_flush - flush (cancel) a request
633 * @oldreq: request to cancel
635 * This sents a flush for a particular request and links
636 * the flush request to the original request. The current
637 * code only supports a single flush request although the protocol
638 * allows for multiple flush requests to be sent for a single request.
642 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
644 struct p9_req_t *req;
648 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
652 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
654 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
660 * if we haven't received a response for oldreq,
661 * remove it from the list
663 if (oldreq->status == REQ_STATUS_FLSH) {
665 list_del(&oldreq->req_list);
666 spin_unlock(&c->lock);
673 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
674 int8_t type, int req_size,
675 const char *fmt, va_list ap)
678 struct p9_req_t *req;
680 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
682 /* we allow for any status other than disconnected */
683 if (c->status == Disconnected)
684 return ERR_PTR(-EIO);
686 /* if status is begin_disconnected we allow only clunk request */
687 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
688 return ERR_PTR(-EIO);
691 if (type != P9_TVERSION) {
692 tag = p9_idpool_get(c->tagpool);
694 return ERR_PTR(-ENOMEM);
697 req = p9_tag_alloc(c, tag, req_size);
701 /* marshall the data */
702 p9pdu_prepare(req->tc, tag, type);
703 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
706 p9pdu_finalize(c, req->tc);
707 trace_9p_client_req(c, type, tag);
715 * p9_client_rpc - issue a request and wait for a response
717 * @type: type of request
718 * @fmt: protocol format string (see protocol.c)
720 * Returns request structure (which client must free using p9_free_req)
723 static struct p9_req_t *
724 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
729 struct p9_req_t *req;
732 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
737 if (signal_pending(current)) {
739 clear_thread_flag(TIF_SIGPENDING);
743 err = c->trans_mod->request(c, req);
745 if (err != -ERESTARTSYS && err != -EFAULT)
746 c->status = Disconnected;
750 /* Wait for the response */
751 err = wait_event_interruptible(*req->wq,
752 req->status >= REQ_STATUS_RCVD);
754 if ((err == -ERESTARTSYS) && (c->status == Connected)
755 && (type == P9_TFLUSH)) {
757 clear_thread_flag(TIF_SIGPENDING);
761 if (req->status == REQ_STATUS_ERROR) {
762 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
765 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
766 p9_debug(P9_DEBUG_MUX, "flushing\n");
768 clear_thread_flag(TIF_SIGPENDING);
770 if (c->trans_mod->cancel(c, req))
771 p9_client_flush(c, req);
773 /* if we received the response anyway, don't signal error */
774 if (req->status == REQ_STATUS_RCVD)
778 spin_lock_irqsave(¤t->sighand->siglock, flags);
780 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
785 err = p9_check_errors(c, req);
786 trace_9p_client_res(c, type, req->rc->tag, err);
791 return ERR_PTR(safe_errno(err));
795 * p9_client_zc_rpc - issue a request and wait for a response
797 * @type: type of request
798 * @uidata: user bffer that should be ued for zero copy read
799 * @uodata: user buffer that shoud be user for zero copy write
800 * @inlen: read buffer size
801 * @olen: write buffer size
802 * @hdrlen: reader header size, This is the size of response protocol data
803 * @fmt: protocol format string (see protocol.c)
805 * Returns request structure (which client must free using p9_free_req)
807 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
808 char *uidata, char *uodata,
809 int inlen, int olen, int in_hdrlen,
810 int kern_buf, const char *fmt, ...)
815 struct p9_req_t *req;
819 * We allocate a inline protocol data of only 4k bytes.
820 * The actual content is passed in zero-copy fashion.
822 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
827 if (signal_pending(current)) {
829 clear_thread_flag(TIF_SIGPENDING);
833 /* If we are called with KERNEL_DS force kern_buf */
834 if (segment_eq(get_fs(), KERNEL_DS))
837 err = c->trans_mod->zc_request(c, req, uidata, uodata,
838 inlen, olen, in_hdrlen, kern_buf);
841 c->status = Disconnected;
844 if (req->status == REQ_STATUS_ERROR) {
845 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
848 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
849 p9_debug(P9_DEBUG_MUX, "flushing\n");
851 clear_thread_flag(TIF_SIGPENDING);
853 if (c->trans_mod->cancel(c, req))
854 p9_client_flush(c, req);
856 /* if we received the response anyway, don't signal error */
857 if (req->status == REQ_STATUS_RCVD)
861 spin_lock_irqsave(¤t->sighand->siglock, flags);
863 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
868 err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf);
869 trace_9p_client_res(c, type, req->rc->tag, err);
874 return ERR_PTR(safe_errno(err));
877 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
883 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
884 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
886 return ERR_PTR(-ENOMEM);
888 ret = p9_idpool_get(clnt->fidpool);
895 memset(&fid->qid, 0, sizeof(struct p9_qid));
897 fid->uid = current_fsuid();
900 spin_lock_irqsave(&clnt->lock, flags);
901 list_add(&fid->flist, &clnt->fidlist);
902 spin_unlock_irqrestore(&clnt->lock, flags);
911 static void p9_fid_destroy(struct p9_fid *fid)
913 struct p9_client *clnt;
916 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
918 p9_idpool_put(fid->fid, clnt->fidpool);
919 spin_lock_irqsave(&clnt->lock, flags);
920 list_del(&fid->flist);
921 spin_unlock_irqrestore(&clnt->lock, flags);
926 static int p9_client_version(struct p9_client *c)
929 struct p9_req_t *req;
933 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
934 c->msize, c->proto_version);
936 switch (c->proto_version) {
938 req = p9_client_rpc(c, P9_TVERSION, "ds",
939 c->msize, "9P2000.L");
942 req = p9_client_rpc(c, P9_TVERSION, "ds",
943 c->msize, "9P2000.u");
945 case p9_proto_legacy:
946 req = p9_client_rpc(c, P9_TVERSION, "ds",
957 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
959 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
960 trace_9p_protocol_dump(c, req->rc);
964 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
965 if (!strncmp(version, "9P2000.L", 8))
966 c->proto_version = p9_proto_2000L;
967 else if (!strncmp(version, "9P2000.u", 8))
968 c->proto_version = p9_proto_2000u;
969 else if (!strncmp(version, "9P2000", 6))
970 c->proto_version = p9_proto_legacy;
976 if (msize < c->msize)
986 struct p9_client *p9_client_create(const char *dev_name, char *options)
989 struct p9_client *clnt;
993 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
995 return ERR_PTR(-ENOMEM);
997 clnt->trans_mod = NULL;
1000 client_id = utsname()->nodename;
1001 memcpy(clnt->name, client_id, strlen(client_id) + 1);
1003 spin_lock_init(&clnt->lock);
1004 INIT_LIST_HEAD(&clnt->fidlist);
1006 err = p9_tag_init(clnt);
1010 err = parse_opts(options, clnt);
1012 goto destroy_tagpool;
1014 if (!clnt->trans_mod)
1015 clnt->trans_mod = v9fs_get_default_trans();
1017 if (clnt->trans_mod == NULL) {
1018 err = -EPROTONOSUPPORT;
1019 p9_debug(P9_DEBUG_ERROR,
1020 "No transport defined or default transport\n");
1021 goto destroy_tagpool;
1024 clnt->fidpool = p9_idpool_create();
1025 if (IS_ERR(clnt->fidpool)) {
1026 err = PTR_ERR(clnt->fidpool);
1030 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1031 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1033 err = clnt->trans_mod->create(clnt, dev_name, options);
1035 goto destroy_fidpool;
1037 if (clnt->msize > clnt->trans_mod->maxsize)
1038 clnt->msize = clnt->trans_mod->maxsize;
1040 err = p9_client_version(clnt);
1047 clnt->trans_mod->close(clnt);
1049 p9_idpool_destroy(clnt->fidpool);
1051 v9fs_put_trans(clnt->trans_mod);
1053 p9_idpool_destroy(clnt->tagpool);
1056 return ERR_PTR(err);
1058 EXPORT_SYMBOL(p9_client_create);
1060 void p9_client_destroy(struct p9_client *clnt)
1062 struct p9_fid *fid, *fidptr;
1064 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1066 if (clnt->trans_mod)
1067 clnt->trans_mod->close(clnt);
1069 v9fs_put_trans(clnt->trans_mod);
1071 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1072 pr_info("Found fid %d not clunked\n", fid->fid);
1073 p9_fid_destroy(fid);
1077 p9_idpool_destroy(clnt->fidpool);
1079 p9_tag_cleanup(clnt);
1083 EXPORT_SYMBOL(p9_client_destroy);
1085 void p9_client_disconnect(struct p9_client *clnt)
1087 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1088 clnt->status = Disconnected;
1090 EXPORT_SYMBOL(p9_client_disconnect);
1092 void p9_client_begin_disconnect(struct p9_client *clnt)
1094 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1095 clnt->status = BeginDisconnect;
1097 EXPORT_SYMBOL(p9_client_begin_disconnect);
1099 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1100 char *uname, kuid_t n_uname, char *aname)
1103 struct p9_req_t *req;
1108 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1109 afid ? afid->fid : -1, uname, aname);
1110 fid = p9_fid_create(clnt);
1117 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1118 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1124 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1126 trace_9p_protocol_dump(clnt, req->rc);
1127 p9_free_req(clnt, req);
1131 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1132 qid.type, (unsigned long long)qid.path, qid.version);
1134 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1136 p9_free_req(clnt, req);
1141 p9_fid_destroy(fid);
1142 return ERR_PTR(err);
1144 EXPORT_SYMBOL(p9_client_attach);
1146 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1147 char **wnames, int clone)
1150 struct p9_client *clnt;
1152 struct p9_qid *wqids;
1153 struct p9_req_t *req;
1154 uint16_t nwqids, count;
1158 clnt = oldfid->clnt;
1160 fid = p9_fid_create(clnt);
1167 fid->uid = oldfid->uid;
1172 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1173 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1175 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1182 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1184 trace_9p_protocol_dump(clnt, req->rc);
1185 p9_free_req(clnt, req);
1188 p9_free_req(clnt, req);
1190 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1192 if (nwqids != nwname) {
1197 for (count = 0; count < nwqids; count++)
1198 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1199 count, wqids[count].type,
1200 (unsigned long long)wqids[count].path,
1201 wqids[count].version);
1204 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1206 fid->qid = oldfid->qid;
1213 p9_client_clunk(fid);
1217 if (fid && (fid != oldfid))
1218 p9_fid_destroy(fid);
1220 return ERR_PTR(err);
1222 EXPORT_SYMBOL(p9_client_walk);
1224 int p9_client_open(struct p9_fid *fid, int mode)
1227 struct p9_client *clnt;
1228 struct p9_req_t *req;
1233 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1234 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1237 if (fid->mode != -1)
1240 if (p9_is_proto_dotl(clnt))
1241 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1243 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1249 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1251 trace_9p_protocol_dump(clnt, req->rc);
1252 goto free_and_error;
1255 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1256 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1257 (unsigned long long)qid.path, qid.version, iounit);
1260 fid->iounit = iounit;
1263 p9_free_req(clnt, req);
1267 EXPORT_SYMBOL(p9_client_open);
1269 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1270 kgid_t gid, struct p9_qid *qid)
1273 struct p9_client *clnt;
1274 struct p9_req_t *req;
1277 p9_debug(P9_DEBUG_9P,
1278 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1279 ofid->fid, name, flags, mode,
1280 from_kgid(&init_user_ns, gid));
1283 if (ofid->mode != -1)
1286 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1293 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1295 trace_9p_protocol_dump(clnt, req->rc);
1296 goto free_and_error;
1299 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1301 (unsigned long long)qid->path,
1302 qid->version, iounit);
1305 ofid->iounit = iounit;
1308 p9_free_req(clnt, req);
1312 EXPORT_SYMBOL(p9_client_create_dotl);
1314 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1318 struct p9_client *clnt;
1319 struct p9_req_t *req;
1323 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1324 fid->fid, name, perm, mode);
1328 if (fid->mode != -1)
1331 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1338 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1340 trace_9p_protocol_dump(clnt, req->rc);
1341 goto free_and_error;
1344 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1346 (unsigned long long)qid.path,
1347 qid.version, iounit);
1350 fid->iounit = iounit;
1353 p9_free_req(clnt, req);
1357 EXPORT_SYMBOL(p9_client_fcreate);
1359 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, kgid_t gid,
1363 struct p9_client *clnt;
1364 struct p9_req_t *req;
1366 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1367 dfid->fid, name, symtgt);
1370 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1377 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1379 trace_9p_protocol_dump(clnt, req->rc);
1380 goto free_and_error;
1383 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1384 qid->type, (unsigned long long)qid->path, qid->version);
1387 p9_free_req(clnt, req);
1391 EXPORT_SYMBOL(p9_client_symlink);
1393 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1395 struct p9_client *clnt;
1396 struct p9_req_t *req;
1398 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1399 dfid->fid, oldfid->fid, newname);
1401 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1404 return PTR_ERR(req);
1406 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1407 p9_free_req(clnt, req);
1410 EXPORT_SYMBOL(p9_client_link);
1412 int p9_client_fsync(struct p9_fid *fid, int datasync)
1415 struct p9_client *clnt;
1416 struct p9_req_t *req;
1418 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1419 fid->fid, datasync);
1423 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1429 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1431 p9_free_req(clnt, req);
1436 EXPORT_SYMBOL(p9_client_fsync);
1438 int p9_client_clunk(struct p9_fid *fid)
1441 struct p9_client *clnt;
1442 struct p9_req_t *req;
1446 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1447 __func__, task_pid_nr(current));
1453 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1458 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1464 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1466 p9_free_req(clnt, req);
1469 * Fid is not valid even after a failed clunk
1470 * If interrupted, retry once then give up and
1471 * leak fid until umount.
1473 if (err == -ERESTARTSYS) {
1477 p9_fid_destroy(fid);
1480 EXPORT_SYMBOL(p9_client_clunk);
1482 int p9_client_remove(struct p9_fid *fid)
1485 struct p9_client *clnt;
1486 struct p9_req_t *req;
1488 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1492 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1498 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1500 p9_free_req(clnt, req);
1502 if (err == -ERESTARTSYS)
1503 p9_client_clunk(fid);
1505 p9_fid_destroy(fid);
1508 EXPORT_SYMBOL(p9_client_remove);
1510 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1513 struct p9_req_t *req;
1514 struct p9_client *clnt;
1516 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1517 dfid->fid, name, flags);
1520 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1525 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1527 p9_free_req(clnt, req);
1531 EXPORT_SYMBOL(p9_client_unlinkat);
1534 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1539 struct p9_req_t *req;
1540 struct p9_client *clnt;
1541 int err, rsize, non_zc = 0;
1544 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1545 fid->fid, (unsigned long long) offset, count);
1549 rsize = fid->iounit;
1550 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1551 rsize = clnt->msize - P9_IOHDRSZ;
1556 /* Don't bother zerocopy for small IO (< 1024) */
1557 if (clnt->trans_mod->zc_request && rsize > 1024) {
1563 indata = (__force char *)udata;
1565 * response header len is 11
1566 * PDU Header(7) + IO Size (4)
1568 req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0,
1569 11, kernel_buf, "dqd", fid->fid,
1573 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1581 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1583 trace_9p_protocol_dump(clnt, req->rc);
1584 goto free_and_error;
1587 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1591 memmove(data, dataptr, count);
1593 err = copy_to_user(udata, dataptr, count);
1596 goto free_and_error;
1600 p9_free_req(clnt, req);
1604 p9_free_req(clnt, req);
1608 EXPORT_SYMBOL(p9_client_read);
1611 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1612 u64 offset, u32 count)
1616 struct p9_client *clnt;
1617 struct p9_req_t *req;
1619 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1620 fid->fid, (unsigned long long) offset, count);
1624 rsize = fid->iounit;
1625 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1626 rsize = clnt->msize - P9_IOHDRSZ;
1631 /* Don't bother zerocopy for small IO (< 1024) */
1632 if (clnt->trans_mod->zc_request && rsize > 1024) {
1638 odata = (char *)udata;
1639 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize,
1640 P9_ZC_HDR_SZ, kernel_buf, "dqd",
1641 fid->fid, offset, rsize);
1644 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
1645 offset, rsize, data);
1647 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
1648 offset, rsize, udata);
1655 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1657 trace_9p_protocol_dump(clnt, req->rc);
1658 goto free_and_error;
1661 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1663 p9_free_req(clnt, req);
1667 p9_free_req(clnt, req);
1671 EXPORT_SYMBOL(p9_client_write);
1673 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1676 struct p9_client *clnt;
1677 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1678 struct p9_req_t *req;
1681 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1684 return ERR_PTR(-ENOMEM);
1689 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1695 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1697 trace_9p_protocol_dump(clnt, req->rc);
1698 p9_free_req(clnt, req);
1702 p9_debug(P9_DEBUG_9P,
1703 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1704 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1705 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1706 "<<< uid=%d gid=%d n_muid=%d\n",
1707 ret->size, ret->type, ret->dev, ret->qid.type,
1708 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1709 ret->atime, ret->mtime, (unsigned long long)ret->length,
1710 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1711 from_kuid(&init_user_ns, ret->n_uid),
1712 from_kgid(&init_user_ns, ret->n_gid),
1713 from_kuid(&init_user_ns, ret->n_muid));
1715 p9_free_req(clnt, req);
1720 return ERR_PTR(err);
1722 EXPORT_SYMBOL(p9_client_stat);
1724 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1728 struct p9_client *clnt;
1729 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1731 struct p9_req_t *req;
1733 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1734 fid->fid, request_mask);
1737 return ERR_PTR(-ENOMEM);
1742 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1748 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1750 trace_9p_protocol_dump(clnt, req->rc);
1751 p9_free_req(clnt, req);
1755 p9_debug(P9_DEBUG_9P,
1756 "<<< RGETATTR st_result_mask=%lld\n"
1757 "<<< qid=%x.%llx.%x\n"
1758 "<<< st_mode=%8.8x st_nlink=%llu\n"
1759 "<<< st_uid=%d st_gid=%d\n"
1760 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1761 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1762 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1763 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1764 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1765 "<<< st_gen=%lld st_data_version=%lld",
1766 ret->st_result_mask, ret->qid.type, ret->qid.path,
1767 ret->qid.version, ret->st_mode, ret->st_nlink,
1768 from_kuid(&init_user_ns, ret->st_uid),
1769 from_kgid(&init_user_ns, ret->st_gid),
1770 ret->st_rdev, ret->st_size, ret->st_blksize,
1771 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1772 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1773 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1774 ret->st_gen, ret->st_data_version);
1776 p9_free_req(clnt, req);
1781 return ERR_PTR(err);
1783 EXPORT_SYMBOL(p9_client_getattr_dotl);
1785 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1789 /* NOTE: size shouldn't include its own length */
1790 /* size[2] type[2] dev[4] qid[13] */
1791 /* mode[4] atime[4] mtime[4] length[8]*/
1792 /* name[s] uid[s] gid[s] muid[s] */
1793 ret = 2+4+13+4+4+4+8+2+2+2+2;
1796 ret += strlen(wst->name);
1798 ret += strlen(wst->uid);
1800 ret += strlen(wst->gid);
1802 ret += strlen(wst->muid);
1804 if ((proto_version == p9_proto_2000u) ||
1805 (proto_version == p9_proto_2000L)) {
1806 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1808 ret += strlen(wst->extension);
1814 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1817 struct p9_req_t *req;
1818 struct p9_client *clnt;
1822 wst->size = p9_client_statsize(wst, clnt->proto_version);
1823 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1824 p9_debug(P9_DEBUG_9P,
1825 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1826 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1827 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1828 " uid=%d gid=%d n_muid=%d\n",
1829 wst->size, wst->type, wst->dev, wst->qid.type,
1830 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1831 wst->atime, wst->mtime, (unsigned long long)wst->length,
1832 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1833 from_kuid(&init_user_ns, wst->n_uid),
1834 from_kgid(&init_user_ns, wst->n_gid),
1835 from_kuid(&init_user_ns, wst->n_muid));
1837 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1843 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1845 p9_free_req(clnt, req);
1849 EXPORT_SYMBOL(p9_client_wstat);
1851 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1854 struct p9_req_t *req;
1855 struct p9_client *clnt;
1859 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1860 p9_debug(P9_DEBUG_9P,
1861 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1862 " atime_sec=%lld atime_nsec=%lld\n"
1863 " mtime_sec=%lld mtime_nsec=%lld\n",
1864 p9attr->valid, p9attr->mode,
1865 from_kuid(&init_user_ns, p9attr->uid),
1866 from_kgid(&init_user_ns, p9attr->gid),
1867 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1868 p9attr->mtime_sec, p9attr->mtime_nsec);
1870 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1876 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1877 p9_free_req(clnt, req);
1881 EXPORT_SYMBOL(p9_client_setattr);
1883 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1886 struct p9_req_t *req;
1887 struct p9_client *clnt;
1892 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1894 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1900 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1901 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1902 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1904 trace_9p_protocol_dump(clnt, req->rc);
1905 p9_free_req(clnt, req);
1909 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1910 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1911 "fsid %llu namelen %ld\n",
1912 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1913 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1914 sb->fsid, (long int)sb->namelen);
1916 p9_free_req(clnt, req);
1920 EXPORT_SYMBOL(p9_client_statfs);
1922 int p9_client_rename(struct p9_fid *fid,
1923 struct p9_fid *newdirfid, const char *name)
1926 struct p9_req_t *req;
1927 struct p9_client *clnt;
1932 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1933 fid->fid, newdirfid->fid, name);
1935 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1936 newdirfid->fid, name);
1942 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1944 p9_free_req(clnt, req);
1948 EXPORT_SYMBOL(p9_client_rename);
1950 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1951 struct p9_fid *newdirfid, const char *new_name)
1954 struct p9_req_t *req;
1955 struct p9_client *clnt;
1958 clnt = olddirfid->clnt;
1960 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1961 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1962 newdirfid->fid, new_name);
1964 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1965 old_name, newdirfid->fid, new_name);
1971 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1972 newdirfid->fid, new_name);
1974 p9_free_req(clnt, req);
1978 EXPORT_SYMBOL(p9_client_renameat);
1981 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1983 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1984 const char *attr_name, u64 *attr_size)
1987 struct p9_req_t *req;
1988 struct p9_client *clnt;
1989 struct p9_fid *attr_fid;
1992 clnt = file_fid->clnt;
1993 attr_fid = p9_fid_create(clnt);
1994 if (IS_ERR(attr_fid)) {
1995 err = PTR_ERR(attr_fid);
1999 p9_debug(P9_DEBUG_9P,
2000 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2001 file_fid->fid, attr_fid->fid, attr_name);
2003 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2004 file_fid->fid, attr_fid->fid, attr_name);
2009 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
2011 trace_9p_protocol_dump(clnt, req->rc);
2012 p9_free_req(clnt, req);
2015 p9_free_req(clnt, req);
2016 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2017 attr_fid->fid, *attr_size);
2020 p9_client_clunk(attr_fid);
2023 if (attr_fid && (attr_fid != file_fid))
2024 p9_fid_destroy(attr_fid);
2026 return ERR_PTR(err);
2028 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2030 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2031 u64 attr_size, int flags)
2034 struct p9_req_t *req;
2035 struct p9_client *clnt;
2037 p9_debug(P9_DEBUG_9P,
2038 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2039 fid->fid, name, (long long)attr_size, flags);
2042 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2043 fid->fid, name, attr_size, flags);
2048 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2049 p9_free_req(clnt, req);
2053 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2055 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2057 int err, rsize, non_zc = 0;
2058 struct p9_client *clnt;
2059 struct p9_req_t *req;
2062 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2063 fid->fid, (unsigned long long) offset, count);
2068 rsize = fid->iounit;
2069 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2070 rsize = clnt->msize - P9_READDIRHDRSZ;
2075 /* Don't bother zerocopy for small IO (< 1024) */
2076 if (clnt->trans_mod->zc_request && rsize > 1024) {
2078 * response header len is 11
2079 * PDU Header(7) + IO Size (4)
2081 req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0,
2082 11, 1, "dqd", fid->fid, offset, rsize);
2085 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2093 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2095 trace_9p_protocol_dump(clnt, req->rc);
2096 goto free_and_error;
2099 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2102 memmove(data, dataptr, count);
2104 p9_free_req(clnt, req);
2108 p9_free_req(clnt, req);
2112 EXPORT_SYMBOL(p9_client_readdir);
2114 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
2115 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2118 struct p9_client *clnt;
2119 struct p9_req_t *req;
2123 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2124 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2125 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2126 MAJOR(rdev), MINOR(rdev), gid);
2128 return PTR_ERR(req);
2130 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2132 trace_9p_protocol_dump(clnt, req->rc);
2135 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2136 (unsigned long long)qid->path, qid->version);
2139 p9_free_req(clnt, req);
2143 EXPORT_SYMBOL(p9_client_mknod_dotl);
2145 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
2146 kgid_t gid, struct p9_qid *qid)
2149 struct p9_client *clnt;
2150 struct p9_req_t *req;
2154 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2155 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2156 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
2159 return PTR_ERR(req);
2161 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2163 trace_9p_protocol_dump(clnt, req->rc);
2166 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2167 (unsigned long long)qid->path, qid->version);
2170 p9_free_req(clnt, req);
2174 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2176 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2179 struct p9_client *clnt;
2180 struct p9_req_t *req;
2184 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2185 "start %lld length %lld proc_id %d client_id %s\n",
2186 fid->fid, flock->type, flock->flags, flock->start,
2187 flock->length, flock->proc_id, flock->client_id);
2189 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2190 flock->flags, flock->start, flock->length,
2191 flock->proc_id, flock->client_id);
2194 return PTR_ERR(req);
2196 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2198 trace_9p_protocol_dump(clnt, req->rc);
2201 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2203 p9_free_req(clnt, req);
2207 EXPORT_SYMBOL(p9_client_lock_dotl);
2209 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2212 struct p9_client *clnt;
2213 struct p9_req_t *req;
2217 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2218 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2219 glock->start, glock->length, glock->proc_id, glock->client_id);
2221 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2222 glock->start, glock->length, glock->proc_id, glock->client_id);
2225 return PTR_ERR(req);
2227 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2228 &glock->start, &glock->length, &glock->proc_id,
2231 trace_9p_protocol_dump(clnt, req->rc);
2234 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2235 "proc_id %d client_id %s\n", glock->type, glock->start,
2236 glock->length, glock->proc_id, glock->client_id);
2238 p9_free_req(clnt, req);
2241 EXPORT_SYMBOL(p9_client_getlock_dotl);
2243 int p9_client_readlink(struct p9_fid *fid, char **target)
2246 struct p9_client *clnt;
2247 struct p9_req_t *req;
2251 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2253 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2255 return PTR_ERR(req);
2257 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2259 trace_9p_protocol_dump(clnt, req->rc);
2262 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2264 p9_free_req(clnt, req);
2267 EXPORT_SYMBOL(p9_client_readlink);