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;
201 v9fs_put_trans(clnt->trans_mod);
202 clnt->trans_mod = v9fs_get_trans_by_name(s);
203 if (clnt->trans_mod == NULL) {
204 pr_info("Could not find request transport: %s\n",
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 r = get_protocol_version(s);
225 clnt->proto_version = r;
235 v9fs_put_trans(clnt->trans_mod);
240 static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc,
243 if (likely(c->fcall_cache) && alloc_msize == c->msize) {
244 fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS);
245 fc->cache = c->fcall_cache;
247 fc->sdata = kmalloc(alloc_msize, GFP_NOFS);
252 fc->capacity = alloc_msize;
256 void p9_fcall_fini(struct p9_fcall *fc)
258 /* sdata can be NULL for interrupted requests in trans_rdma,
259 * and kmem_cache_free does not do NULL-check for us
261 if (unlikely(!fc->sdata))
265 kmem_cache_free(fc->cache, fc->sdata);
269 EXPORT_SYMBOL(p9_fcall_fini);
271 static struct kmem_cache *p9_req_cache;
274 * p9_req_alloc - Allocate a new request.
275 * @c: Client session.
276 * @type: Transaction type.
277 * @max_size: Maximum packet size for this request.
279 * Context: Process context.
280 * Return: Pointer to new request.
282 static struct p9_req_t *
283 p9_tag_alloc(struct p9_client *c, int8_t type, unsigned int max_size)
285 struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS);
286 int alloc_msize = min(c->msize, max_size);
290 return ERR_PTR(-ENOMEM);
292 if (p9_fcall_init(c, &req->tc, alloc_msize))
294 if (p9_fcall_init(c, &req->rc, alloc_msize))
297 p9pdu_reset(&req->tc);
298 p9pdu_reset(&req->rc);
300 req->status = REQ_STATUS_ALLOC;
301 init_waitqueue_head(&req->wq);
302 INIT_LIST_HEAD(&req->req_list);
304 idr_preload(GFP_NOFS);
305 spin_lock_irq(&c->lock);
306 if (type == P9_TVERSION)
307 tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1,
310 tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT);
312 spin_unlock_irq(&c->lock);
317 /* Init ref to two because in the general case there is one ref
318 * that is put asynchronously by a writer thread, one ref
319 * temporarily given by p9_tag_lookup and put by p9_client_cb
320 * in the recv thread, and one ref put by p9_tag_remove in the
321 * main thread. The only exception is virtio that does not use
322 * p9_tag_lookup but does not have a writer thread either
323 * (the write happens synchronously in the request/zc_request
324 * callback), so p9_client_cb eats the second ref there
325 * as the pointer is duplicated directly by virtqueue_add_sgs()
327 refcount_set(&req->refcount.refcount, 2);
332 p9_fcall_fini(&req->tc);
333 p9_fcall_fini(&req->rc);
335 kmem_cache_free(p9_req_cache, req);
336 return ERR_PTR(-ENOMEM);
340 * p9_tag_lookup - Look up a request by tag.
341 * @c: Client session.
342 * @tag: Transaction ID.
344 * Context: Any context.
345 * Return: A request, or %NULL if there is no request with that tag.
347 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
349 struct p9_req_t *req;
353 req = idr_find(&c->reqs, tag);
355 /* We have to be careful with the req found under rcu_read_lock
356 * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the
357 * ref again without corrupting other data, then check again
358 * that the tag matches once we have the ref
360 if (!p9_req_try_get(req))
362 if (req->tc.tag != tag) {
371 EXPORT_SYMBOL(p9_tag_lookup);
374 * p9_tag_remove - Remove a tag.
375 * @c: Client session.
376 * @r: Request of reference.
378 * Context: Any context.
380 static int p9_tag_remove(struct p9_client *c, struct p9_req_t *r)
385 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
386 spin_lock_irqsave(&c->lock, flags);
387 idr_remove(&c->reqs, tag);
388 spin_unlock_irqrestore(&c->lock, flags);
389 return p9_req_put(r);
392 static void p9_req_free(struct kref *ref)
394 struct p9_req_t *r = container_of(ref, struct p9_req_t, refcount);
395 p9_fcall_fini(&r->tc);
396 p9_fcall_fini(&r->rc);
397 kmem_cache_free(p9_req_cache, r);
400 int p9_req_put(struct p9_req_t *r)
402 return kref_put(&r->refcount, p9_req_free);
404 EXPORT_SYMBOL(p9_req_put);
407 * p9_tag_cleanup - cleans up tags structure and reclaims resources
408 * @c: v9fs client struct
410 * This frees resources associated with the tags structure
413 static void p9_tag_cleanup(struct p9_client *c)
415 struct p9_req_t *req;
419 idr_for_each_entry(&c->reqs, req, id) {
420 pr_info("Tag %d still in use\n", id);
421 if (p9_tag_remove(c, req) == 0)
422 pr_warn("Packet with tag %d has still references",
429 * p9_client_cb - call back from transport to client
431 * req: request received
434 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
436 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag);
439 * This barrier is needed to make sure any change made to req before
440 * the status change is visible to another thread
443 req->status = status;
446 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag);
449 EXPORT_SYMBOL(p9_client_cb);
452 * p9_parse_header - parse header arguments out of a packet
453 * @pdu: packet to parse
454 * @size: size of packet
455 * @type: type of request
456 * @tag: tag of packet
457 * @rewind: set if we need to rewind offset afterwards
461 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
467 int offset = pdu->offset;
472 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
474 goto rewind_and_exit;
483 if (pdu->size != r_size || r_size < 7) {
485 goto rewind_and_exit;
491 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
492 pdu->size, pdu->id, pdu->tag);
496 pdu->offset = offset;
499 EXPORT_SYMBOL(p9_parse_header);
502 * p9_check_errors - check 9p packet for error return and process it
503 * @c: current client instance
504 * @req: request to parse and check for error conditions
506 * returns error code if one is discovered, otherwise returns 0
508 * this will have to be more complicated if we have multiple
512 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
518 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0);
519 if (req->rc.size >= c->msize) {
520 p9_debug(P9_DEBUG_ERROR,
521 "requested packet size too big: %d\n",
526 * dump the response from server
527 * This should be after check errors which poplulate pdu_fcall.
529 trace_9p_protocol_dump(c, &req->rc);
531 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
534 if (type != P9_RERROR && type != P9_RLERROR)
537 if (!p9_is_proto_dotl(c)) {
539 err = p9pdu_readf(&req->rc, c->proto_version, "s?d",
544 if (p9_is_proto_dotu(c) && ecode < 512)
548 err = p9_errstr2errno(ename, strlen(ename));
550 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
555 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode);
560 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
566 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
572 * p9_check_zc_errors - check 9p packet for error return and process it
573 * @c: current client instance
574 * @req: request to parse and check for error conditions
575 * @in_hdrlen: Size of response protocol buffer.
577 * returns error code if one is discovered, otherwise returns 0
579 * this will have to be more complicated if we have multiple
583 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
584 struct iov_iter *uidata, int in_hdrlen)
591 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0);
593 * dump the response from server
594 * This should be after parse_header which poplulate pdu_fcall.
596 trace_9p_protocol_dump(c, &req->rc);
598 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
602 if (type != P9_RERROR && type != P9_RLERROR)
605 if (!p9_is_proto_dotl(c)) {
606 /* Error is reported in string format */
608 /* 7 = header size for RERROR; */
609 int inline_len = in_hdrlen - 7;
611 len = req->rc.size - req->rc.offset;
612 if (len > (P9_ZC_HDR_SZ - 7)) {
617 ename = &req->rc.sdata[req->rc.offset];
618 if (len > inline_len) {
619 /* We have error in external buffer */
620 if (!copy_from_iter_full(ename + inline_len,
621 len - inline_len, uidata)) {
627 err = p9pdu_readf(&req->rc, c->proto_version, "s?d",
632 if (p9_is_proto_dotu(c) && ecode < 512)
636 err = p9_errstr2errno(ename, strlen(ename));
638 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
643 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode);
646 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
651 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
655 static struct p9_req_t *
656 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
659 * p9_client_flush - flush (cancel) a request
661 * @oldreq: request to cancel
663 * This sents a flush for a particular request and links
664 * the flush request to the original request. The current
665 * code only supports a single flush request although the protocol
666 * allows for multiple flush requests to be sent for a single request.
670 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
672 struct p9_req_t *req;
676 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1);
680 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
682 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
687 * if we haven't received a response for oldreq,
688 * remove it from the list
690 if (oldreq->status == REQ_STATUS_SENT) {
691 if (c->trans_mod->cancelled)
692 c->trans_mod->cancelled(c, oldreq);
695 p9_tag_remove(c, req);
699 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
700 int8_t type, int req_size,
701 const char *fmt, va_list ap)
704 struct p9_req_t *req;
706 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
708 /* we allow for any status other than disconnected */
709 if (c->status == Disconnected)
710 return ERR_PTR(-EIO);
712 /* if status is begin_disconnected we allow only clunk request */
713 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
714 return ERR_PTR(-EIO);
716 req = p9_tag_alloc(c, type, req_size);
720 /* marshall the data */
721 p9pdu_prepare(&req->tc, req->tc.tag, type);
722 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap);
725 p9pdu_finalize(c, &req->tc);
726 trace_9p_client_req(c, type, req->tc.tag);
729 p9_tag_remove(c, req);
730 /* We have to put also the 2nd reference as it won't be used */
736 * p9_client_rpc - issue a request and wait for a response
738 * @type: type of request
739 * @fmt: protocol format string (see protocol.c)
741 * Returns request structure (which client must free using p9_tag_remove)
744 static struct p9_req_t *
745 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
750 struct p9_req_t *req;
753 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
758 if (signal_pending(current)) {
760 clear_thread_flag(TIF_SIGPENDING);
764 err = c->trans_mod->request(c, req);
766 /* write won't happen */
768 if (err != -ERESTARTSYS && err != -EFAULT)
769 c->status = Disconnected;
770 goto recalc_sigpending;
773 /* Wait for the response */
774 err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD);
777 * Make sure our req is coherent with regard to updates in other
778 * threads - echoes to wmb() in the callback
782 if ((err == -ERESTARTSYS) && (c->status == Connected)
783 && (type == P9_TFLUSH)) {
785 clear_thread_flag(TIF_SIGPENDING);
789 if (req->status == REQ_STATUS_ERROR) {
790 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
793 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
794 p9_debug(P9_DEBUG_MUX, "flushing\n");
796 clear_thread_flag(TIF_SIGPENDING);
798 if (c->trans_mod->cancel(c, req))
799 p9_client_flush(c, req);
801 /* if we received the response anyway, don't signal error */
802 if (req->status == REQ_STATUS_RCVD)
807 spin_lock_irqsave(¤t->sighand->siglock, flags);
809 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
814 err = p9_check_errors(c, req);
815 trace_9p_client_res(c, type, req->rc.tag, err);
819 p9_tag_remove(c, req);
820 return ERR_PTR(safe_errno(err));
824 * p9_client_zc_rpc - issue a request and wait for a response
826 * @type: type of request
827 * @uidata: destination for zero copy read
828 * @uodata: source for zero copy write
829 * @inlen: read buffer size
830 * @olen: write buffer size
831 * @hdrlen: reader header size, This is the size of response protocol data
832 * @fmt: protocol format string (see protocol.c)
834 * Returns request structure (which client must free using p9_tag_remove)
836 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
837 struct iov_iter *uidata,
838 struct iov_iter *uodata,
839 int inlen, int olen, int in_hdrlen,
840 const char *fmt, ...)
845 struct p9_req_t *req;
849 * We allocate a inline protocol data of only 4k bytes.
850 * The actual content is passed in zero-copy fashion.
852 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
857 if (signal_pending(current)) {
859 clear_thread_flag(TIF_SIGPENDING);
863 err = c->trans_mod->zc_request(c, req, uidata, uodata,
864 inlen, olen, in_hdrlen);
867 c->status = Disconnected;
868 if (err != -ERESTARTSYS)
869 goto recalc_sigpending;
871 if (req->status == REQ_STATUS_ERROR) {
872 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
875 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
876 p9_debug(P9_DEBUG_MUX, "flushing\n");
878 clear_thread_flag(TIF_SIGPENDING);
880 if (c->trans_mod->cancel(c, req))
881 p9_client_flush(c, req);
883 /* if we received the response anyway, don't signal error */
884 if (req->status == REQ_STATUS_RCVD)
889 spin_lock_irqsave(¤t->sighand->siglock, flags);
891 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
896 err = p9_check_zc_errors(c, req, uidata, in_hdrlen);
897 trace_9p_client_res(c, type, req->rc.tag, err);
901 p9_tag_remove(c, req);
902 return ERR_PTR(safe_errno(err));
905 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
910 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
911 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
915 memset(&fid->qid, 0, sizeof(struct p9_qid));
917 fid->uid = current_fsuid();
922 idr_preload(GFP_KERNEL);
923 spin_lock_irq(&clnt->lock);
924 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1,
926 spin_unlock_irq(&clnt->lock);
936 static void p9_fid_destroy(struct p9_fid *fid)
938 struct p9_client *clnt;
941 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
943 spin_lock_irqsave(&clnt->lock, flags);
944 idr_remove(&clnt->fids, fid->fid);
945 spin_unlock_irqrestore(&clnt->lock, flags);
950 static int p9_client_version(struct p9_client *c)
953 struct p9_req_t *req;
954 char *version = NULL;
957 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
958 c->msize, c->proto_version);
960 switch (c->proto_version) {
962 req = p9_client_rpc(c, P9_TVERSION, "ds",
963 c->msize, "9P2000.L");
966 req = p9_client_rpc(c, P9_TVERSION, "ds",
967 c->msize, "9P2000.u");
969 case p9_proto_legacy:
970 req = p9_client_rpc(c, P9_TVERSION, "ds",
980 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version);
982 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
983 trace_9p_protocol_dump(c, &req->rc);
987 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
988 if (!strncmp(version, "9P2000.L", 8))
989 c->proto_version = p9_proto_2000L;
990 else if (!strncmp(version, "9P2000.u", 8))
991 c->proto_version = p9_proto_2000u;
992 else if (!strncmp(version, "9P2000", 6))
993 c->proto_version = p9_proto_legacy;
995 p9_debug(P9_DEBUG_ERROR,
996 "server returned an unknown version: %s\n", version);
1002 p9_debug(P9_DEBUG_ERROR,
1003 "server returned a msize < 4096: %d\n", msize);
1007 if (msize < c->msize)
1012 p9_tag_remove(c, req);
1017 struct p9_client *p9_client_create(const char *dev_name, char *options)
1020 struct p9_client *clnt;
1024 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
1026 return ERR_PTR(-ENOMEM);
1028 clnt->trans_mod = NULL;
1030 clnt->fcall_cache = NULL;
1032 client_id = utsname()->nodename;
1033 memcpy(clnt->name, client_id, strlen(client_id) + 1);
1035 spin_lock_init(&clnt->lock);
1036 idr_init(&clnt->fids);
1037 idr_init(&clnt->reqs);
1039 err = parse_opts(options, clnt);
1043 if (!clnt->trans_mod)
1044 clnt->trans_mod = v9fs_get_default_trans();
1046 if (clnt->trans_mod == NULL) {
1047 err = -EPROTONOSUPPORT;
1048 p9_debug(P9_DEBUG_ERROR,
1049 "No transport defined or default transport\n");
1053 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1054 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1056 err = clnt->trans_mod->create(clnt, dev_name, options);
1060 if (clnt->msize > clnt->trans_mod->maxsize)
1061 clnt->msize = clnt->trans_mod->maxsize;
1063 if (clnt->msize < 4096) {
1064 p9_debug(P9_DEBUG_ERROR,
1065 "Please specify a msize of at least 4k\n");
1070 err = p9_client_version(clnt);
1074 /* P9_HDRSZ + 4 is the smallest packet header we can have that is
1075 * followed by data accessed from userspace by read
1078 kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize,
1080 clnt->msize - (P9_HDRSZ + 4),
1086 clnt->trans_mod->close(clnt);
1088 v9fs_put_trans(clnt->trans_mod);
1091 return ERR_PTR(err);
1093 EXPORT_SYMBOL(p9_client_create);
1095 void p9_client_destroy(struct p9_client *clnt)
1100 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1102 if (clnt->trans_mod)
1103 clnt->trans_mod->close(clnt);
1105 v9fs_put_trans(clnt->trans_mod);
1107 idr_for_each_entry(&clnt->fids, fid, id) {
1108 pr_info("Found fid %d not clunked\n", fid->fid);
1109 p9_fid_destroy(fid);
1112 p9_tag_cleanup(clnt);
1114 kmem_cache_destroy(clnt->fcall_cache);
1117 EXPORT_SYMBOL(p9_client_destroy);
1119 void p9_client_disconnect(struct p9_client *clnt)
1121 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1122 clnt->status = Disconnected;
1124 EXPORT_SYMBOL(p9_client_disconnect);
1126 void p9_client_begin_disconnect(struct p9_client *clnt)
1128 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1129 clnt->status = BeginDisconnect;
1131 EXPORT_SYMBOL(p9_client_begin_disconnect);
1133 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1134 const char *uname, kuid_t n_uname, const char *aname)
1137 struct p9_req_t *req;
1142 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1143 afid ? afid->fid : -1, uname, aname);
1144 fid = p9_fid_create(clnt);
1151 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1152 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1158 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid);
1160 trace_9p_protocol_dump(clnt, &req->rc);
1161 p9_tag_remove(clnt, req);
1165 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1166 qid.type, (unsigned long long)qid.path, qid.version);
1168 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1170 p9_tag_remove(clnt, req);
1175 p9_fid_destroy(fid);
1176 return ERR_PTR(err);
1178 EXPORT_SYMBOL(p9_client_attach);
1180 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1181 const unsigned char * const *wnames, int clone)
1184 struct p9_client *clnt;
1186 struct p9_qid *wqids;
1187 struct p9_req_t *req;
1188 uint16_t nwqids, count;
1192 clnt = oldfid->clnt;
1194 fid = p9_fid_create(clnt);
1200 fid->uid = oldfid->uid;
1205 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1206 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1208 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1215 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1217 trace_9p_protocol_dump(clnt, &req->rc);
1218 p9_tag_remove(clnt, req);
1221 p9_tag_remove(clnt, req);
1223 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1225 if (nwqids != nwname) {
1230 for (count = 0; count < nwqids; count++)
1231 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1232 count, wqids[count].type,
1233 (unsigned long long)wqids[count].path,
1234 wqids[count].version);
1237 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1239 fid->qid = oldfid->qid;
1246 p9_client_clunk(fid);
1250 if (fid && (fid != oldfid))
1251 p9_fid_destroy(fid);
1253 return ERR_PTR(err);
1255 EXPORT_SYMBOL(p9_client_walk);
1257 int p9_client_open(struct p9_fid *fid, int mode)
1260 struct p9_client *clnt;
1261 struct p9_req_t *req;
1266 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1267 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1270 if (fid->mode != -1)
1273 if (p9_is_proto_dotl(clnt))
1274 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1276 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1282 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1284 trace_9p_protocol_dump(clnt, &req->rc);
1285 goto free_and_error;
1288 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1289 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1290 (unsigned long long)qid.path, qid.version, iounit);
1293 fid->iounit = iounit;
1296 p9_tag_remove(clnt, req);
1300 EXPORT_SYMBOL(p9_client_open);
1302 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode,
1303 kgid_t gid, struct p9_qid *qid)
1306 struct p9_client *clnt;
1307 struct p9_req_t *req;
1310 p9_debug(P9_DEBUG_9P,
1311 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1312 ofid->fid, name, flags, mode,
1313 from_kgid(&init_user_ns, gid));
1316 if (ofid->mode != -1)
1319 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1326 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit);
1328 trace_9p_protocol_dump(clnt, &req->rc);
1329 goto free_and_error;
1332 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1334 (unsigned long long)qid->path,
1335 qid->version, iounit);
1338 ofid->iounit = iounit;
1341 p9_tag_remove(clnt, req);
1345 EXPORT_SYMBOL(p9_client_create_dotl);
1347 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode,
1351 struct p9_client *clnt;
1352 struct p9_req_t *req;
1356 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1357 fid->fid, name, perm, mode);
1361 if (fid->mode != -1)
1364 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1371 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1373 trace_9p_protocol_dump(clnt, &req->rc);
1374 goto free_and_error;
1377 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1379 (unsigned long long)qid.path,
1380 qid.version, iounit);
1383 fid->iounit = iounit;
1386 p9_tag_remove(clnt, req);
1390 EXPORT_SYMBOL(p9_client_fcreate);
1392 int p9_client_symlink(struct p9_fid *dfid, const char *name,
1393 const char *symtgt, kgid_t gid, struct p9_qid *qid)
1396 struct p9_client *clnt;
1397 struct p9_req_t *req;
1399 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1400 dfid->fid, name, symtgt);
1403 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1410 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
1412 trace_9p_protocol_dump(clnt, &req->rc);
1413 goto free_and_error;
1416 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1417 qid->type, (unsigned long long)qid->path, qid->version);
1420 p9_tag_remove(clnt, req);
1424 EXPORT_SYMBOL(p9_client_symlink);
1426 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname)
1428 struct p9_client *clnt;
1429 struct p9_req_t *req;
1431 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1432 dfid->fid, oldfid->fid, newname);
1434 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1437 return PTR_ERR(req);
1439 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1440 p9_tag_remove(clnt, req);
1443 EXPORT_SYMBOL(p9_client_link);
1445 int p9_client_fsync(struct p9_fid *fid, int datasync)
1448 struct p9_client *clnt;
1449 struct p9_req_t *req;
1451 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1452 fid->fid, datasync);
1456 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1462 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1464 p9_tag_remove(clnt, req);
1469 EXPORT_SYMBOL(p9_client_fsync);
1471 int p9_client_clunk(struct p9_fid *fid)
1474 struct p9_client *clnt;
1475 struct p9_req_t *req;
1479 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1480 __func__, task_pid_nr(current));
1486 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1491 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1497 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1499 p9_tag_remove(clnt, req);
1502 * Fid is not valid even after a failed clunk
1503 * If interrupted, retry once then give up and
1504 * leak fid until umount.
1506 if (err == -ERESTARTSYS) {
1510 p9_fid_destroy(fid);
1513 EXPORT_SYMBOL(p9_client_clunk);
1515 int p9_client_remove(struct p9_fid *fid)
1518 struct p9_client *clnt;
1519 struct p9_req_t *req;
1521 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1525 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1531 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1533 p9_tag_remove(clnt, req);
1535 if (err == -ERESTARTSYS)
1536 p9_client_clunk(fid);
1538 p9_fid_destroy(fid);
1541 EXPORT_SYMBOL(p9_client_remove);
1543 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1546 struct p9_req_t *req;
1547 struct p9_client *clnt;
1549 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1550 dfid->fid, name, flags);
1553 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1558 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1560 p9_tag_remove(clnt, req);
1564 EXPORT_SYMBOL(p9_client_unlinkat);
1567 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
1569 struct p9_client *clnt = fid->clnt;
1570 struct p9_req_t *req;
1574 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1575 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to));
1577 while (iov_iter_count(to)) {
1578 int count = iov_iter_count(to);
1579 int rsize, non_zc = 0;
1582 rsize = fid->iounit;
1583 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1584 rsize = clnt->msize - P9_IOHDRSZ;
1589 /* Don't bother zerocopy for small IO (< 1024) */
1590 if (clnt->trans_mod->zc_request && rsize > 1024) {
1592 * response header len is 11
1593 * PDU Header(7) + IO Size (4)
1595 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize,
1596 0, 11, "dqd", fid->fid,
1600 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1604 *err = PTR_ERR(req);
1608 *err = p9pdu_readf(&req->rc, clnt->proto_version,
1609 "D", &count, &dataptr);
1611 trace_9p_protocol_dump(clnt, &req->rc);
1612 p9_tag_remove(clnt, req);
1615 if (rsize < count) {
1616 pr_err("bogus RREAD count (%d > %d)\n", count, rsize);
1620 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1622 p9_tag_remove(clnt, req);
1627 int n = copy_to_iter(dataptr, count, to);
1632 p9_tag_remove(clnt, req);
1636 iov_iter_advance(to, count);
1640 p9_tag_remove(clnt, req);
1644 EXPORT_SYMBOL(p9_client_read);
1647 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
1649 struct p9_client *clnt = fid->clnt;
1650 struct p9_req_t *req;
1654 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n",
1655 fid->fid, (unsigned long long) offset,
1656 iov_iter_count(from));
1658 while (iov_iter_count(from)) {
1659 int count = iov_iter_count(from);
1660 int rsize = fid->iounit;
1661 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1662 rsize = clnt->msize - P9_IOHDRSZ;
1667 /* Don't bother zerocopy for small IO (< 1024) */
1668 if (clnt->trans_mod->zc_request && rsize > 1024) {
1669 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
1670 rsize, P9_ZC_HDR_SZ, "dqd",
1671 fid->fid, offset, rsize);
1673 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
1674 offset, rsize, from);
1677 *err = PTR_ERR(req);
1681 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &count);
1683 trace_9p_protocol_dump(clnt, &req->rc);
1684 p9_tag_remove(clnt, req);
1687 if (rsize < count) {
1688 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize);
1692 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1694 p9_tag_remove(clnt, req);
1695 iov_iter_advance(from, count);
1701 EXPORT_SYMBOL(p9_client_write);
1703 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1706 struct p9_client *clnt;
1707 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1708 struct p9_req_t *req;
1711 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1714 return ERR_PTR(-ENOMEM);
1719 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1725 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret);
1727 trace_9p_protocol_dump(clnt, &req->rc);
1728 p9_tag_remove(clnt, req);
1732 p9_debug(P9_DEBUG_9P,
1733 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1734 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1735 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1736 "<<< uid=%d gid=%d n_muid=%d\n",
1737 ret->size, ret->type, ret->dev, ret->qid.type,
1738 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1739 ret->atime, ret->mtime, (unsigned long long)ret->length,
1740 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1741 from_kuid(&init_user_ns, ret->n_uid),
1742 from_kgid(&init_user_ns, ret->n_gid),
1743 from_kuid(&init_user_ns, ret->n_muid));
1745 p9_tag_remove(clnt, req);
1750 return ERR_PTR(err);
1752 EXPORT_SYMBOL(p9_client_stat);
1754 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1758 struct p9_client *clnt;
1759 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1761 struct p9_req_t *req;
1763 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1764 fid->fid, request_mask);
1767 return ERR_PTR(-ENOMEM);
1772 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1778 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret);
1780 trace_9p_protocol_dump(clnt, &req->rc);
1781 p9_tag_remove(clnt, req);
1785 p9_debug(P9_DEBUG_9P,
1786 "<<< RGETATTR st_result_mask=%lld\n"
1787 "<<< qid=%x.%llx.%x\n"
1788 "<<< st_mode=%8.8x st_nlink=%llu\n"
1789 "<<< st_uid=%d st_gid=%d\n"
1790 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1791 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1792 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1793 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1794 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1795 "<<< st_gen=%lld st_data_version=%lld\n",
1796 ret->st_result_mask, ret->qid.type, ret->qid.path,
1797 ret->qid.version, ret->st_mode, ret->st_nlink,
1798 from_kuid(&init_user_ns, ret->st_uid),
1799 from_kgid(&init_user_ns, ret->st_gid),
1800 ret->st_rdev, ret->st_size, ret->st_blksize,
1801 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1802 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1803 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1804 ret->st_gen, ret->st_data_version);
1806 p9_tag_remove(clnt, req);
1811 return ERR_PTR(err);
1813 EXPORT_SYMBOL(p9_client_getattr_dotl);
1815 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1819 /* NOTE: size shouldn't include its own length */
1820 /* size[2] type[2] dev[4] qid[13] */
1821 /* mode[4] atime[4] mtime[4] length[8]*/
1822 /* name[s] uid[s] gid[s] muid[s] */
1823 ret = 2+4+13+4+4+4+8+2+2+2+2;
1826 ret += strlen(wst->name);
1828 ret += strlen(wst->uid);
1830 ret += strlen(wst->gid);
1832 ret += strlen(wst->muid);
1834 if ((proto_version == p9_proto_2000u) ||
1835 (proto_version == p9_proto_2000L)) {
1836 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1838 ret += strlen(wst->extension);
1844 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1847 struct p9_req_t *req;
1848 struct p9_client *clnt;
1852 wst->size = p9_client_statsize(wst, clnt->proto_version);
1853 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1854 p9_debug(P9_DEBUG_9P,
1855 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1856 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1857 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1858 " uid=%d gid=%d n_muid=%d\n",
1859 wst->size, wst->type, wst->dev, wst->qid.type,
1860 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1861 wst->atime, wst->mtime, (unsigned long long)wst->length,
1862 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1863 from_kuid(&init_user_ns, wst->n_uid),
1864 from_kgid(&init_user_ns, wst->n_gid),
1865 from_kuid(&init_user_ns, wst->n_muid));
1867 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1873 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1875 p9_tag_remove(clnt, req);
1879 EXPORT_SYMBOL(p9_client_wstat);
1881 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1884 struct p9_req_t *req;
1885 struct p9_client *clnt;
1889 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1890 p9_debug(P9_DEBUG_9P,
1891 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1892 " atime_sec=%lld atime_nsec=%lld\n"
1893 " mtime_sec=%lld mtime_nsec=%lld\n",
1894 p9attr->valid, p9attr->mode,
1895 from_kuid(&init_user_ns, p9attr->uid),
1896 from_kgid(&init_user_ns, p9attr->gid),
1897 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1898 p9attr->mtime_sec, p9attr->mtime_nsec);
1900 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1906 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1907 p9_tag_remove(clnt, req);
1911 EXPORT_SYMBOL(p9_client_setattr);
1913 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1916 struct p9_req_t *req;
1917 struct p9_client *clnt;
1922 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1924 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1930 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1931 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1932 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1934 trace_9p_protocol_dump(clnt, &req->rc);
1935 p9_tag_remove(clnt, req);
1939 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1940 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1941 "fsid %llu namelen %ld\n",
1942 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1943 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1944 sb->fsid, (long int)sb->namelen);
1946 p9_tag_remove(clnt, req);
1950 EXPORT_SYMBOL(p9_client_statfs);
1952 int p9_client_rename(struct p9_fid *fid,
1953 struct p9_fid *newdirfid, const char *name)
1956 struct p9_req_t *req;
1957 struct p9_client *clnt;
1962 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1963 fid->fid, newdirfid->fid, name);
1965 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1966 newdirfid->fid, name);
1972 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1974 p9_tag_remove(clnt, req);
1978 EXPORT_SYMBOL(p9_client_rename);
1980 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1981 struct p9_fid *newdirfid, const char *new_name)
1984 struct p9_req_t *req;
1985 struct p9_client *clnt;
1988 clnt = olddirfid->clnt;
1990 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1991 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1992 newdirfid->fid, new_name);
1994 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1995 old_name, newdirfid->fid, new_name);
2001 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
2002 newdirfid->fid, new_name);
2004 p9_tag_remove(clnt, req);
2008 EXPORT_SYMBOL(p9_client_renameat);
2011 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
2013 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
2014 const char *attr_name, u64 *attr_size)
2017 struct p9_req_t *req;
2018 struct p9_client *clnt;
2019 struct p9_fid *attr_fid;
2022 clnt = file_fid->clnt;
2023 attr_fid = p9_fid_create(clnt);
2028 p9_debug(P9_DEBUG_9P,
2029 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2030 file_fid->fid, attr_fid->fid, attr_name);
2032 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2033 file_fid->fid, attr_fid->fid, attr_name);
2038 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size);
2040 trace_9p_protocol_dump(clnt, &req->rc);
2041 p9_tag_remove(clnt, req);
2044 p9_tag_remove(clnt, req);
2045 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2046 attr_fid->fid, *attr_size);
2049 p9_client_clunk(attr_fid);
2052 if (attr_fid && (attr_fid != file_fid))
2053 p9_fid_destroy(attr_fid);
2055 return ERR_PTR(err);
2057 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2059 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2060 u64 attr_size, int flags)
2063 struct p9_req_t *req;
2064 struct p9_client *clnt;
2066 p9_debug(P9_DEBUG_9P,
2067 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2068 fid->fid, name, (long long)attr_size, flags);
2071 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2072 fid->fid, name, attr_size, flags);
2077 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2078 p9_tag_remove(clnt, req);
2082 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2084 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2086 int err, rsize, non_zc = 0;
2087 struct p9_client *clnt;
2088 struct p9_req_t *req;
2090 struct kvec kv = {.iov_base = data, .iov_len = count};
2093 iov_iter_kvec(&to, READ | ITER_KVEC, &kv, 1, count);
2095 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2096 fid->fid, (unsigned long long) offset, count);
2101 rsize = fid->iounit;
2102 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2103 rsize = clnt->msize - P9_READDIRHDRSZ;
2108 /* Don't bother zerocopy for small IO (< 1024) */
2109 if (clnt->trans_mod->zc_request && rsize > 1024) {
2111 * response header len is 11
2112 * PDU Header(7) + IO Size (4)
2114 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0,
2115 11, "dqd", fid->fid, offset, rsize);
2118 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2126 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr);
2128 trace_9p_protocol_dump(clnt, &req->rc);
2129 goto free_and_error;
2131 if (rsize < count) {
2132 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize);
2136 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2139 memmove(data, dataptr, count);
2141 p9_tag_remove(clnt, req);
2145 p9_tag_remove(clnt, req);
2149 EXPORT_SYMBOL(p9_client_readdir);
2151 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode,
2152 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2155 struct p9_client *clnt;
2156 struct p9_req_t *req;
2160 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2161 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2162 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2163 MAJOR(rdev), MINOR(rdev), gid);
2165 return PTR_ERR(req);
2167 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
2169 trace_9p_protocol_dump(clnt, &req->rc);
2172 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2173 (unsigned long long)qid->path, qid->version);
2176 p9_tag_remove(clnt, req);
2180 EXPORT_SYMBOL(p9_client_mknod_dotl);
2182 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode,
2183 kgid_t gid, struct p9_qid *qid)
2186 struct p9_client *clnt;
2187 struct p9_req_t *req;
2191 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2192 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2193 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
2196 return PTR_ERR(req);
2198 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
2200 trace_9p_protocol_dump(clnt, &req->rc);
2203 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2204 (unsigned long long)qid->path, qid->version);
2207 p9_tag_remove(clnt, req);
2211 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2213 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2216 struct p9_client *clnt;
2217 struct p9_req_t *req;
2221 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2222 "start %lld length %lld proc_id %d client_id %s\n",
2223 fid->fid, flock->type, flock->flags, flock->start,
2224 flock->length, flock->proc_id, flock->client_id);
2226 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2227 flock->flags, flock->start, flock->length,
2228 flock->proc_id, flock->client_id);
2231 return PTR_ERR(req);
2233 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status);
2235 trace_9p_protocol_dump(clnt, &req->rc);
2238 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2240 p9_tag_remove(clnt, req);
2244 EXPORT_SYMBOL(p9_client_lock_dotl);
2246 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2249 struct p9_client *clnt;
2250 struct p9_req_t *req;
2254 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2255 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2256 glock->start, glock->length, glock->proc_id, glock->client_id);
2258 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2259 glock->start, glock->length, glock->proc_id, glock->client_id);
2262 return PTR_ERR(req);
2264 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type,
2265 &glock->start, &glock->length, &glock->proc_id,
2268 trace_9p_protocol_dump(clnt, &req->rc);
2271 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2272 "proc_id %d client_id %s\n", glock->type, glock->start,
2273 glock->length, glock->proc_id, glock->client_id);
2275 p9_tag_remove(clnt, req);
2278 EXPORT_SYMBOL(p9_client_getlock_dotl);
2280 int p9_client_readlink(struct p9_fid *fid, char **target)
2283 struct p9_client *clnt;
2284 struct p9_req_t *req;
2288 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2290 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2292 return PTR_ERR(req);
2294 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target);
2296 trace_9p_protocol_dump(clnt, &req->rc);
2299 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2301 p9_tag_remove(clnt, req);
2304 EXPORT_SYMBOL(p9_client_readlink);
2306 int __init p9_client_init(void)
2308 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU);
2309 return p9_req_cache ? 0 : -ENOMEM;
2312 void __exit p9_client_exit(void)
2314 kmem_cache_destroy(p9_req_cache);