1 // SPDX-License-Identifier: GPL-2.0-only
5 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
6 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11 #include <linux/module.h>
12 #include <linux/errno.h>
14 #include <linux/poll.h>
15 #include <linux/idr.h>
16 #include <linux/mutex.h>
17 #include <linux/slab.h>
18 #include <linux/sched/signal.h>
19 #include <linux/uaccess.h>
20 #include <linux/uio.h>
21 #include <net/9p/9p.h>
22 #include <linux/parser.h>
23 #include <linux/seq_file.h>
24 #include <net/9p/client.h>
25 #include <net/9p/transport.h>
28 #define CREATE_TRACE_POINTS
29 #include <trace/events/9p.h>
31 #define DEFAULT_MSIZE (128 * 1024)
33 /* Client Option Parsing (code inspired by NFS code)
34 * - a little lazy - parse all client options
45 static const match_table_t tokens = {
46 {Opt_msize, "msize=%u"},
47 {Opt_legacy, "noextend"},
48 {Opt_trans, "trans=%s"},
49 {Opt_version, "version=%s"},
53 inline int p9_is_proto_dotl(struct p9_client *clnt)
55 return clnt->proto_version == p9_proto_2000L;
57 EXPORT_SYMBOL(p9_is_proto_dotl);
59 inline int p9_is_proto_dotu(struct p9_client *clnt)
61 return clnt->proto_version == p9_proto_2000u;
63 EXPORT_SYMBOL(p9_is_proto_dotu);
65 int p9_show_client_options(struct seq_file *m, struct p9_client *clnt)
67 if (clnt->msize != DEFAULT_MSIZE)
68 seq_printf(m, ",msize=%u", clnt->msize);
69 seq_printf(m, ",trans=%s", clnt->trans_mod->name);
71 switch (clnt->proto_version) {
73 seq_puts(m, ",noextend");
76 seq_puts(m, ",version=9p2000.u");
83 if (clnt->trans_mod->show_options)
84 return clnt->trans_mod->show_options(m, clnt);
87 EXPORT_SYMBOL(p9_show_client_options);
89 /* Some error codes are taken directly from the server replies,
90 * make sure they are valid.
92 static int safe_errno(int err)
94 if (err > 0 || err < -MAX_ERRNO) {
95 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err);
101 /* Interpret mount option for protocol version */
102 static int get_protocol_version(char *s)
104 int version = -EINVAL;
106 if (!strcmp(s, "9p2000")) {
107 version = p9_proto_legacy;
108 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n");
109 } else if (!strcmp(s, "9p2000.u")) {
110 version = p9_proto_2000u;
111 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
112 } else if (!strcmp(s, "9p2000.L")) {
113 version = p9_proto_2000L;
114 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
116 pr_info("Unknown protocol version %s\n", s);
123 * parse_opts - parse mount options into client structure
124 * @opts: options string passed from mount
125 * @clnt: existing v9fs client information
127 * Return 0 upon success, -ERRNO upon failure
130 static int parse_opts(char *opts, struct p9_client *clnt)
132 char *options, *tmp_options;
134 substring_t args[MAX_OPT_ARGS];
139 clnt->proto_version = p9_proto_2000L;
140 clnt->msize = DEFAULT_MSIZE;
145 tmp_options = kstrdup(opts, GFP_KERNEL);
148 options = tmp_options;
150 while ((p = strsep(&options, ",")) != NULL) {
155 token = match_token(p, tokens, args);
158 r = match_int(&args[0], &option);
160 p9_debug(P9_DEBUG_ERROR,
161 "integer field, but no integer?\n");
166 p9_debug(P9_DEBUG_ERROR,
167 "msize should be at least 4k\n");
171 clnt->msize = option;
174 s = match_strdup(&args[0]);
177 p9_debug(P9_DEBUG_ERROR,
178 "problem allocating copy of trans arg\n");
179 goto free_and_return;
182 v9fs_put_trans(clnt->trans_mod);
183 clnt->trans_mod = v9fs_get_trans_by_name(s);
184 if (!clnt->trans_mod) {
185 pr_info("Could not find request transport: %s\n",
192 clnt->proto_version = p9_proto_legacy;
195 s = match_strdup(&args[0]);
198 p9_debug(P9_DEBUG_ERROR,
199 "problem allocating copy of version arg\n");
200 goto free_and_return;
202 r = get_protocol_version(s);
206 clnt->proto_version = r;
216 v9fs_put_trans(clnt->trans_mod);
221 static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc,
224 if (likely(c->fcall_cache) && alloc_msize == c->msize) {
225 fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS);
226 fc->cache = c->fcall_cache;
228 fc->sdata = kmalloc(alloc_msize, GFP_NOFS);
233 fc->capacity = alloc_msize;
237 void p9_fcall_fini(struct p9_fcall *fc)
239 /* sdata can be NULL for interrupted requests in trans_rdma,
240 * and kmem_cache_free does not do NULL-check for us
242 if (unlikely(!fc->sdata))
246 kmem_cache_free(fc->cache, fc->sdata);
250 EXPORT_SYMBOL(p9_fcall_fini);
252 static struct kmem_cache *p9_req_cache;
255 * p9_tag_alloc - Allocate a new request.
256 * @c: Client session.
257 * @type: Transaction type.
258 * @max_size: Maximum packet size for this request.
260 * Context: Process context.
261 * Return: Pointer to new request.
263 static struct p9_req_t *
264 p9_tag_alloc(struct p9_client *c, int8_t type, unsigned int max_size)
266 struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS);
267 int alloc_msize = min(c->msize, max_size);
271 return ERR_PTR(-ENOMEM);
273 if (p9_fcall_init(c, &req->tc, alloc_msize))
275 if (p9_fcall_init(c, &req->rc, alloc_msize))
278 p9pdu_reset(&req->tc);
279 p9pdu_reset(&req->rc);
281 req->status = REQ_STATUS_ALLOC;
282 init_waitqueue_head(&req->wq);
283 INIT_LIST_HEAD(&req->req_list);
285 idr_preload(GFP_NOFS);
286 spin_lock_irq(&c->lock);
287 if (type == P9_TVERSION)
288 tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1,
291 tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT);
293 spin_unlock_irq(&c->lock);
298 /* Init ref to two because in the general case there is one ref
299 * that is put asynchronously by a writer thread, one ref
300 * temporarily given by p9_tag_lookup and put by p9_client_cb
301 * in the recv thread, and one ref put by p9_req_put in the
302 * main thread. The only exception is virtio that does not use
303 * p9_tag_lookup but does not have a writer thread either
304 * (the write happens synchronously in the request/zc_request
305 * callback), so p9_client_cb eats the second ref there
306 * as the pointer is duplicated directly by virtqueue_add_sgs()
308 refcount_set(&req->refcount, 2);
313 p9_fcall_fini(&req->tc);
314 p9_fcall_fini(&req->rc);
316 kmem_cache_free(p9_req_cache, req);
317 return ERR_PTR(-ENOMEM);
321 * p9_tag_lookup - Look up a request by tag.
322 * @c: Client session.
323 * @tag: Transaction ID.
325 * Context: Any context.
326 * Return: A request, or %NULL if there is no request with that tag.
328 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
330 struct p9_req_t *req;
334 req = idr_find(&c->reqs, tag);
336 /* We have to be careful with the req found under rcu_read_lock
337 * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the
338 * ref again without corrupting other data, then check again
339 * that the tag matches once we have the ref
341 if (!p9_req_try_get(req))
343 if (req->tc.tag != tag) {
352 EXPORT_SYMBOL(p9_tag_lookup);
355 * p9_tag_remove - Remove a tag.
356 * @c: Client session.
357 * @r: Request of reference.
359 * Context: Any context.
361 static void p9_tag_remove(struct p9_client *c, struct p9_req_t *r)
366 p9_debug(P9_DEBUG_MUX, "freeing clnt %p req %p tag: %d\n", c, r, tag);
367 spin_lock_irqsave(&c->lock, flags);
368 idr_remove(&c->reqs, tag);
369 spin_unlock_irqrestore(&c->lock, flags);
372 int p9_req_put(struct p9_client *c, struct p9_req_t *r)
374 if (refcount_dec_and_test(&r->refcount)) {
377 p9_fcall_fini(&r->tc);
378 p9_fcall_fini(&r->rc);
379 kmem_cache_free(p9_req_cache, r);
384 EXPORT_SYMBOL(p9_req_put);
387 * p9_tag_cleanup - cleans up tags structure and reclaims resources
388 * @c: v9fs client struct
390 * This frees resources associated with the tags structure
393 static void p9_tag_cleanup(struct p9_client *c)
395 struct p9_req_t *req;
399 idr_for_each_entry(&c->reqs, req, id) {
400 pr_info("Tag %d still in use\n", id);
401 if (p9_req_put(c, req) == 0)
402 pr_warn("Packet with tag %d has still references",
409 * p9_client_cb - call back from transport to client
411 * @req: request received
412 * @status: request status, one of REQ_STATUS_*
415 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
417 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag);
419 /* This barrier is needed to make sure any change made to req before
420 * the status change is visible to another thread
423 req->status = status;
426 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag);
429 EXPORT_SYMBOL(p9_client_cb);
432 * p9_parse_header - parse header arguments out of a packet
433 * @pdu: packet to parse
434 * @size: size of packet
435 * @type: type of request
436 * @tag: tag of packet
437 * @rewind: set if we need to rewind offset afterwards
441 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type,
442 int16_t *tag, int rewind)
447 int offset = pdu->offset;
452 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
454 goto rewind_and_exit;
463 if (pdu->size != r_size || r_size < 7) {
465 goto rewind_and_exit;
471 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
472 pdu->size, pdu->id, pdu->tag);
476 pdu->offset = offset;
479 EXPORT_SYMBOL(p9_parse_header);
482 * p9_check_errors - check 9p packet for error return and process it
483 * @c: current client instance
484 * @req: request to parse and check for error conditions
486 * returns error code if one is discovered, otherwise returns 0
488 * this will have to be more complicated if we have multiple
492 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
498 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0);
499 if (req->rc.size >= c->msize) {
500 p9_debug(P9_DEBUG_ERROR,
501 "requested packet size too big: %d\n",
505 /* dump the response from server
506 * This should be after check errors which poplulate pdu_fcall.
508 trace_9p_protocol_dump(c, &req->rc);
510 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
513 if (type != P9_RERROR && type != P9_RLERROR)
516 if (!p9_is_proto_dotl(c)) {
519 err = p9pdu_readf(&req->rc, c->proto_version, "s?d",
524 if (p9_is_proto_dotu(c) && ecode < 512)
528 err = p9_errstr2errno(ename, strlen(ename));
530 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
535 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode);
540 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
546 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
551 static struct p9_req_t *
552 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
555 * p9_client_flush - flush (cancel) a request
557 * @oldreq: request to cancel
559 * This sents a flush for a particular request and links
560 * the flush request to the original request. The current
561 * code only supports a single flush request although the protocol
562 * allows for multiple flush requests to be sent for a single request.
566 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
568 struct p9_req_t *req;
572 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1);
576 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
578 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
582 /* if we haven't received a response for oldreq,
583 * remove it from the list
585 if (oldreq->status == REQ_STATUS_SENT) {
586 if (c->trans_mod->cancelled)
587 c->trans_mod->cancelled(c, oldreq);
594 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
595 int8_t type, int req_size,
596 const char *fmt, va_list ap)
599 struct p9_req_t *req;
601 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
603 /* we allow for any status other than disconnected */
604 if (c->status == Disconnected)
605 return ERR_PTR(-EIO);
607 /* if status is begin_disconnected we allow only clunk request */
608 if (c->status == BeginDisconnect && type != P9_TCLUNK)
609 return ERR_PTR(-EIO);
611 req = p9_tag_alloc(c, type, req_size);
615 /* marshall the data */
616 p9pdu_prepare(&req->tc, req->tc.tag, type);
617 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap);
620 p9pdu_finalize(c, &req->tc);
621 trace_9p_client_req(c, type, req->tc.tag);
625 /* We have to put also the 2nd reference as it won't be used */
631 * p9_client_rpc - issue a request and wait for a response
633 * @type: type of request
634 * @fmt: protocol format string (see protocol.c)
636 * Returns request structure (which client must free using p9_req_put)
639 static struct p9_req_t *
640 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
645 struct p9_req_t *req;
648 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
653 if (signal_pending(current)) {
655 clear_thread_flag(TIF_SIGPENDING);
660 err = c->trans_mod->request(c, req);
662 /* write won't happen */
664 if (err != -ERESTARTSYS && err != -EFAULT)
665 c->status = Disconnected;
666 goto recalc_sigpending;
669 /* Wait for the response */
670 err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD);
672 /* Make sure our req is coherent with regard to updates in other
673 * threads - echoes to wmb() in the callback
677 if (err == -ERESTARTSYS && c->status == Connected &&
680 clear_thread_flag(TIF_SIGPENDING);
684 if (req->status == REQ_STATUS_ERROR) {
685 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
688 if (err == -ERESTARTSYS && c->status == Connected) {
689 p9_debug(P9_DEBUG_MUX, "flushing\n");
691 clear_thread_flag(TIF_SIGPENDING);
693 if (c->trans_mod->cancel(c, req))
694 p9_client_flush(c, req);
696 /* if we received the response anyway, don't signal error */
697 if (req->status == REQ_STATUS_RCVD)
702 spin_lock_irqsave(¤t->sighand->siglock, flags);
704 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
709 err = p9_check_errors(c, req);
710 trace_9p_client_res(c, type, req->rc.tag, err);
715 return ERR_PTR(safe_errno(err));
719 * p9_client_zc_rpc - issue a request and wait for a response
721 * @type: type of request
722 * @uidata: destination for zero copy read
723 * @uodata: source for zero copy write
724 * @inlen: read buffer size
725 * @olen: write buffer size
726 * @in_hdrlen: reader header size, This is the size of response protocol data
727 * @fmt: protocol format string (see protocol.c)
729 * Returns request structure (which client must free using p9_req_put)
731 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
732 struct iov_iter *uidata,
733 struct iov_iter *uodata,
734 int inlen, int olen, int in_hdrlen,
735 const char *fmt, ...)
740 struct p9_req_t *req;
743 /* We allocate a inline protocol data of only 4k bytes.
744 * The actual content is passed in zero-copy fashion.
746 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
751 if (signal_pending(current)) {
753 clear_thread_flag(TIF_SIGPENDING);
758 err = c->trans_mod->zc_request(c, req, uidata, uodata,
759 inlen, olen, in_hdrlen);
762 c->status = Disconnected;
763 if (err != -ERESTARTSYS)
764 goto recalc_sigpending;
766 if (req->status == REQ_STATUS_ERROR) {
767 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
770 if (err == -ERESTARTSYS && c->status == Connected) {
771 p9_debug(P9_DEBUG_MUX, "flushing\n");
773 clear_thread_flag(TIF_SIGPENDING);
775 if (c->trans_mod->cancel(c, req))
776 p9_client_flush(c, req);
778 /* if we received the response anyway, don't signal error */
779 if (req->status == REQ_STATUS_RCVD)
784 spin_lock_irqsave(¤t->sighand->siglock, flags);
786 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
791 err = p9_check_errors(c, req);
792 trace_9p_client_res(c, type, req->rc.tag, err);
797 return ERR_PTR(safe_errno(err));
800 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
805 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
806 fid = kzalloc(sizeof(*fid), GFP_KERNEL);
811 fid->uid = current_fsuid();
813 refcount_set(&fid->count, 1);
815 idr_preload(GFP_KERNEL);
816 spin_lock_irq(&clnt->lock);
817 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1,
819 spin_unlock_irq(&clnt->lock);
822 trace_9p_fid_ref(fid, P9_FID_REF_CREATE);
830 static void p9_fid_destroy(struct p9_fid *fid)
832 struct p9_client *clnt;
835 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
836 trace_9p_fid_ref(fid, P9_FID_REF_DESTROY);
838 spin_lock_irqsave(&clnt->lock, flags);
839 idr_remove(&clnt->fids, fid->fid);
840 spin_unlock_irqrestore(&clnt->lock, flags);
845 /* We also need to export tracepoint symbols for tracepoint_enabled() */
846 EXPORT_TRACEPOINT_SYMBOL(9p_fid_ref);
848 void do_trace_9p_fid_get(struct p9_fid *fid)
850 trace_9p_fid_ref(fid, P9_FID_REF_GET);
852 EXPORT_SYMBOL(do_trace_9p_fid_get);
854 void do_trace_9p_fid_put(struct p9_fid *fid)
856 trace_9p_fid_ref(fid, P9_FID_REF_PUT);
858 EXPORT_SYMBOL(do_trace_9p_fid_put);
860 static int p9_client_version(struct p9_client *c)
863 struct p9_req_t *req;
864 char *version = NULL;
867 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
868 c->msize, c->proto_version);
870 switch (c->proto_version) {
872 req = p9_client_rpc(c, P9_TVERSION, "ds",
873 c->msize, "9P2000.L");
876 req = p9_client_rpc(c, P9_TVERSION, "ds",
877 c->msize, "9P2000.u");
879 case p9_proto_legacy:
880 req = p9_client_rpc(c, P9_TVERSION, "ds",
890 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version);
892 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
893 trace_9p_protocol_dump(c, &req->rc);
897 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
898 if (!strncmp(version, "9P2000.L", 8)) {
899 c->proto_version = p9_proto_2000L;
900 } else if (!strncmp(version, "9P2000.u", 8)) {
901 c->proto_version = p9_proto_2000u;
902 } else if (!strncmp(version, "9P2000", 6)) {
903 c->proto_version = p9_proto_legacy;
905 p9_debug(P9_DEBUG_ERROR,
906 "server returned an unknown version: %s\n", version);
912 p9_debug(P9_DEBUG_ERROR,
913 "server returned a msize < 4096: %d\n", msize);
917 if (msize < c->msize)
927 struct p9_client *p9_client_create(const char *dev_name, char *options)
930 struct p9_client *clnt;
934 clnt = kmalloc(sizeof(*clnt), GFP_KERNEL);
936 return ERR_PTR(-ENOMEM);
938 clnt->trans_mod = NULL;
940 clnt->fcall_cache = NULL;
942 client_id = utsname()->nodename;
943 memcpy(clnt->name, client_id, strlen(client_id) + 1);
945 spin_lock_init(&clnt->lock);
946 idr_init(&clnt->fids);
947 idr_init(&clnt->reqs);
949 err = parse_opts(options, clnt);
953 if (!clnt->trans_mod)
954 clnt->trans_mod = v9fs_get_default_trans();
956 if (!clnt->trans_mod) {
957 err = -EPROTONOSUPPORT;
958 p9_debug(P9_DEBUG_ERROR,
959 "No transport defined or default transport\n");
963 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
964 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
966 err = clnt->trans_mod->create(clnt, dev_name, options);
970 if (clnt->msize > clnt->trans_mod->maxsize) {
971 clnt->msize = clnt->trans_mod->maxsize;
972 pr_info("Limiting 'msize' to %d as this is the maximum "
973 "supported by transport %s\n",
974 clnt->msize, clnt->trans_mod->name
978 if (clnt->msize < 4096) {
979 p9_debug(P9_DEBUG_ERROR,
980 "Please specify a msize of at least 4k\n");
985 err = p9_client_version(clnt);
989 /* P9_HDRSZ + 4 is the smallest packet header we can have that is
990 * followed by data accessed from userspace by read
993 kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize,
995 clnt->msize - (P9_HDRSZ + 4),
1001 clnt->trans_mod->close(clnt);
1003 v9fs_put_trans(clnt->trans_mod);
1006 return ERR_PTR(err);
1008 EXPORT_SYMBOL(p9_client_create);
1010 void p9_client_destroy(struct p9_client *clnt)
1015 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1017 if (clnt->trans_mod)
1018 clnt->trans_mod->close(clnt);
1020 v9fs_put_trans(clnt->trans_mod);
1022 idr_for_each_entry(&clnt->fids, fid, id) {
1023 pr_info("Found fid %d not clunked\n", fid->fid);
1024 p9_fid_destroy(fid);
1027 p9_tag_cleanup(clnt);
1029 kmem_cache_destroy(clnt->fcall_cache);
1032 EXPORT_SYMBOL(p9_client_destroy);
1034 void p9_client_disconnect(struct p9_client *clnt)
1036 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1037 clnt->status = Disconnected;
1039 EXPORT_SYMBOL(p9_client_disconnect);
1041 void p9_client_begin_disconnect(struct p9_client *clnt)
1043 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1044 clnt->status = BeginDisconnect;
1046 EXPORT_SYMBOL(p9_client_begin_disconnect);
1048 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1049 const char *uname, kuid_t n_uname,
1053 struct p9_req_t *req;
1057 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1058 afid ? afid->fid : -1, uname, aname);
1059 fid = p9_fid_create(clnt);
1066 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1067 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1073 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid);
1075 trace_9p_protocol_dump(clnt, &req->rc);
1076 p9_req_put(clnt, req);
1080 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1081 qid.type, qid.path, qid.version);
1083 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1085 p9_req_put(clnt, req);
1090 p9_fid_destroy(fid);
1091 return ERR_PTR(err);
1093 EXPORT_SYMBOL(p9_client_attach);
1095 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1096 const unsigned char * const *wnames, int clone)
1099 struct p9_client *clnt;
1101 struct p9_qid *wqids;
1102 struct p9_req_t *req;
1107 clnt = oldfid->clnt;
1109 fid = p9_fid_create(clnt);
1115 fid->uid = oldfid->uid;
1120 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1121 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1122 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1129 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1131 trace_9p_protocol_dump(clnt, &req->rc);
1132 p9_req_put(clnt, req);
1135 p9_req_put(clnt, req);
1137 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1139 if (nwqids != nwname) {
1144 for (count = 0; count < nwqids; count++)
1145 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1146 count, wqids[count].type,
1148 wqids[count].version);
1151 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1153 memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid));
1164 if (fid && fid != oldfid)
1165 p9_fid_destroy(fid);
1167 return ERR_PTR(err);
1169 EXPORT_SYMBOL(p9_client_walk);
1171 int p9_client_open(struct p9_fid *fid, int mode)
1174 struct p9_client *clnt;
1175 struct p9_req_t *req;
1180 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1181 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1184 if (fid->mode != -1)
1187 if (p9_is_proto_dotl(clnt))
1188 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1190 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1196 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1198 trace_9p_protocol_dump(clnt, &req->rc);
1199 goto free_and_error;
1202 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1203 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1204 qid.path, qid.version, iounit);
1206 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1208 fid->iounit = iounit;
1211 p9_req_put(clnt, req);
1215 EXPORT_SYMBOL(p9_client_open);
1217 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags,
1218 u32 mode, kgid_t gid, struct p9_qid *qid)
1221 struct p9_client *clnt;
1222 struct p9_req_t *req;
1225 p9_debug(P9_DEBUG_9P,
1226 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1227 ofid->fid, name, flags, mode,
1228 from_kgid(&init_user_ns, gid));
1231 if (ofid->mode != -1)
1234 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1241 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit);
1243 trace_9p_protocol_dump(clnt, &req->rc);
1244 goto free_and_error;
1247 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1248 qid->type, qid->path, qid->version, iounit);
1250 memmove(&ofid->qid, qid, sizeof(struct p9_qid));
1252 ofid->iounit = iounit;
1255 p9_req_put(clnt, req);
1259 EXPORT_SYMBOL(p9_client_create_dotl);
1261 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode,
1265 struct p9_client *clnt;
1266 struct p9_req_t *req;
1270 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1271 fid->fid, name, perm, mode);
1275 if (fid->mode != -1)
1278 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1285 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1287 trace_9p_protocol_dump(clnt, &req->rc);
1288 goto free_and_error;
1291 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1292 qid.type, qid.path, qid.version, iounit);
1294 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1296 fid->iounit = iounit;
1299 p9_req_put(clnt, req);
1303 EXPORT_SYMBOL(p9_client_fcreate);
1305 int p9_client_symlink(struct p9_fid *dfid, const char *name,
1306 const char *symtgt, kgid_t gid, struct p9_qid *qid)
1309 struct p9_client *clnt;
1310 struct p9_req_t *req;
1312 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1313 dfid->fid, name, symtgt);
1316 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1323 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
1325 trace_9p_protocol_dump(clnt, &req->rc);
1326 goto free_and_error;
1329 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1330 qid->type, qid->path, qid->version);
1333 p9_req_put(clnt, req);
1337 EXPORT_SYMBOL(p9_client_symlink);
1339 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname)
1341 struct p9_client *clnt;
1342 struct p9_req_t *req;
1344 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1345 dfid->fid, oldfid->fid, newname);
1347 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1350 return PTR_ERR(req);
1352 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1353 p9_req_put(clnt, req);
1356 EXPORT_SYMBOL(p9_client_link);
1358 int p9_client_fsync(struct p9_fid *fid, int datasync)
1361 struct p9_client *clnt;
1362 struct p9_req_t *req;
1364 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1365 fid->fid, datasync);
1369 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1375 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1377 p9_req_put(clnt, req);
1382 EXPORT_SYMBOL(p9_client_fsync);
1384 int p9_client_clunk(struct p9_fid *fid)
1387 struct p9_client *clnt;
1388 struct p9_req_t *req;
1392 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n",
1397 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1403 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1405 p9_req_put(clnt, req);
1407 /* Fid is not valid even after a failed clunk
1408 * If interrupted, retry once then give up and
1409 * leak fid until umount.
1411 if (err == -ERESTARTSYS) {
1415 p9_fid_destroy(fid);
1419 EXPORT_SYMBOL(p9_client_clunk);
1421 int p9_client_remove(struct p9_fid *fid)
1424 struct p9_client *clnt;
1425 struct p9_req_t *req;
1427 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1431 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1437 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1439 p9_req_put(clnt, req);
1441 if (err == -ERESTARTSYS)
1444 p9_fid_destroy(fid);
1447 EXPORT_SYMBOL(p9_client_remove);
1449 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1452 struct p9_req_t *req;
1453 struct p9_client *clnt;
1455 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1456 dfid->fid, name, flags);
1459 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1464 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1466 p9_req_put(clnt, req);
1470 EXPORT_SYMBOL(p9_client_unlinkat);
1473 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
1478 while (iov_iter_count(to)) {
1481 count = p9_client_read_once(fid, offset, to, err);
1489 EXPORT_SYMBOL(p9_client_read);
1492 p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to,
1495 struct p9_client *clnt = fid->clnt;
1496 struct p9_req_t *req;
1497 int count = iov_iter_count(to);
1498 int rsize, received, non_zc = 0;
1502 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %zu\n",
1503 fid->fid, offset, iov_iter_count(to));
1505 rsize = fid->iounit;
1506 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ)
1507 rsize = clnt->msize - P9_IOHDRSZ;
1512 /* Don't bother zerocopy for small IO (< 1024) */
1513 if (clnt->trans_mod->zc_request && rsize > 1024) {
1514 /* response header len is 11
1515 * PDU Header(7) + IO Size (4)
1517 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize,
1518 0, 11, "dqd", fid->fid,
1522 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1526 *err = PTR_ERR(req);
1528 iov_iter_revert(to, count - iov_iter_count(to));
1532 *err = p9pdu_readf(&req->rc, clnt->proto_version,
1533 "D", &received, &dataptr);
1536 iov_iter_revert(to, count - iov_iter_count(to));
1537 trace_9p_protocol_dump(clnt, &req->rc);
1538 p9_req_put(clnt, req);
1541 if (rsize < received) {
1542 pr_err("bogus RREAD count (%d > %d)\n", received, rsize);
1546 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1549 int n = copy_to_iter(dataptr, received, to);
1551 if (n != received) {
1553 p9_req_put(clnt, req);
1557 iov_iter_revert(to, count - received - iov_iter_count(to));
1559 p9_req_put(clnt, req);
1562 EXPORT_SYMBOL(p9_client_read_once);
1565 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
1567 struct p9_client *clnt = fid->clnt;
1568 struct p9_req_t *req;
1572 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n",
1573 fid->fid, offset, iov_iter_count(from));
1575 while (iov_iter_count(from)) {
1576 int count = iov_iter_count(from);
1577 int rsize = fid->iounit;
1580 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ)
1581 rsize = clnt->msize - P9_IOHDRSZ;
1586 /* Don't bother zerocopy for small IO (< 1024) */
1587 if (clnt->trans_mod->zc_request && rsize > 1024) {
1588 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
1589 rsize, P9_ZC_HDR_SZ, "dqd",
1590 fid->fid, offset, rsize);
1592 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
1593 offset, rsize, from);
1596 iov_iter_revert(from, count - iov_iter_count(from));
1597 *err = PTR_ERR(req);
1601 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &written);
1603 iov_iter_revert(from, count - iov_iter_count(from));
1604 trace_9p_protocol_dump(clnt, &req->rc);
1605 p9_req_put(clnt, req);
1608 if (rsize < written) {
1609 pr_err("bogus RWRITE count (%d > %d)\n", written, rsize);
1613 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1615 p9_req_put(clnt, req);
1616 iov_iter_revert(from, count - written - iov_iter_count(from));
1622 EXPORT_SYMBOL(p9_client_write);
1624 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1627 struct p9_client *clnt;
1628 struct p9_wstat *ret;
1629 struct p9_req_t *req;
1632 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1634 ret = kmalloc(sizeof(*ret), GFP_KERNEL);
1636 return ERR_PTR(-ENOMEM);
1641 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1647 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret);
1649 trace_9p_protocol_dump(clnt, &req->rc);
1650 p9_req_put(clnt, req);
1654 p9_debug(P9_DEBUG_9P,
1655 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1656 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1657 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1658 "<<< uid=%d gid=%d n_muid=%d\n",
1659 ret->size, ret->type, ret->dev, ret->qid.type, ret->qid.path,
1660 ret->qid.version, ret->mode,
1661 ret->atime, ret->mtime, ret->length,
1662 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1663 from_kuid(&init_user_ns, ret->n_uid),
1664 from_kgid(&init_user_ns, ret->n_gid),
1665 from_kuid(&init_user_ns, ret->n_muid));
1667 p9_req_put(clnt, req);
1672 return ERR_PTR(err);
1674 EXPORT_SYMBOL(p9_client_stat);
1676 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1680 struct p9_client *clnt;
1681 struct p9_stat_dotl *ret;
1682 struct p9_req_t *req;
1684 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1685 fid->fid, request_mask);
1687 ret = kmalloc(sizeof(*ret), GFP_KERNEL);
1689 return ERR_PTR(-ENOMEM);
1694 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1700 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret);
1702 trace_9p_protocol_dump(clnt, &req->rc);
1703 p9_req_put(clnt, req);
1707 p9_debug(P9_DEBUG_9P, "<<< RGETATTR st_result_mask=%lld\n"
1708 "<<< qid=%x.%llx.%x\n"
1709 "<<< st_mode=%8.8x st_nlink=%llu\n"
1710 "<<< st_uid=%d st_gid=%d\n"
1711 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1712 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1713 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1714 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1715 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1716 "<<< st_gen=%lld st_data_version=%lld\n",
1717 ret->st_result_mask,
1718 ret->qid.type, ret->qid.path, ret->qid.version,
1719 ret->st_mode, ret->st_nlink,
1720 from_kuid(&init_user_ns, ret->st_uid),
1721 from_kgid(&init_user_ns, ret->st_gid),
1722 ret->st_rdev, ret->st_size, ret->st_blksize, ret->st_blocks,
1723 ret->st_atime_sec, ret->st_atime_nsec,
1724 ret->st_mtime_sec, ret->st_mtime_nsec,
1725 ret->st_ctime_sec, ret->st_ctime_nsec,
1726 ret->st_btime_sec, ret->st_btime_nsec,
1727 ret->st_gen, ret->st_data_version);
1729 p9_req_put(clnt, req);
1734 return ERR_PTR(err);
1736 EXPORT_SYMBOL(p9_client_getattr_dotl);
1738 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1742 /* NOTE: size shouldn't include its own length */
1743 /* size[2] type[2] dev[4] qid[13] */
1744 /* mode[4] atime[4] mtime[4] length[8]*/
1745 /* name[s] uid[s] gid[s] muid[s] */
1746 ret = 2 + 4 + 13 + 4 + 4 + 4 + 8 + 2 + 2 + 2 + 2;
1749 ret += strlen(wst->name);
1751 ret += strlen(wst->uid);
1753 ret += strlen(wst->gid);
1755 ret += strlen(wst->muid);
1757 if (proto_version == p9_proto_2000u ||
1758 proto_version == p9_proto_2000L) {
1759 /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1760 ret += 2 + 4 + 4 + 4;
1762 ret += strlen(wst->extension);
1768 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1771 struct p9_req_t *req;
1772 struct p9_client *clnt;
1776 wst->size = p9_client_statsize(wst, clnt->proto_version);
1777 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n",
1779 p9_debug(P9_DEBUG_9P,
1780 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1781 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1782 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1783 " uid=%d gid=%d n_muid=%d\n",
1784 wst->size, wst->type, wst->dev, wst->qid.type,
1785 wst->qid.path, wst->qid.version,
1786 wst->mode, wst->atime, wst->mtime, wst->length,
1787 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1788 from_kuid(&init_user_ns, wst->n_uid),
1789 from_kgid(&init_user_ns, wst->n_gid),
1790 from_kuid(&init_user_ns, wst->n_muid));
1792 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS",
1793 fid->fid, wst->size + 2, wst);
1799 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1801 p9_req_put(clnt, req);
1805 EXPORT_SYMBOL(p9_client_wstat);
1807 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1810 struct p9_req_t *req;
1811 struct p9_client *clnt;
1815 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1816 p9_debug(P9_DEBUG_9P, " valid=%x mode=%x uid=%d gid=%d size=%lld\n",
1817 p9attr->valid, p9attr->mode,
1818 from_kuid(&init_user_ns, p9attr->uid),
1819 from_kgid(&init_user_ns, p9attr->gid),
1821 p9_debug(P9_DEBUG_9P, " atime_sec=%lld atime_nsec=%lld\n",
1822 p9attr->atime_sec, p9attr->atime_nsec);
1823 p9_debug(P9_DEBUG_9P, " mtime_sec=%lld mtime_nsec=%lld\n",
1824 p9attr->mtime_sec, p9attr->mtime_nsec);
1826 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1832 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1833 p9_req_put(clnt, req);
1837 EXPORT_SYMBOL(p9_client_setattr);
1839 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1842 struct p9_req_t *req;
1843 struct p9_client *clnt;
1848 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1850 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1856 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1857 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1858 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1860 trace_9p_protocol_dump(clnt, &req->rc);
1861 p9_req_put(clnt, req);
1865 p9_debug(P9_DEBUG_9P,
1866 "<<< RSTATFS fid %d type 0x%x bsize %u blocks %llu bfree %llu bavail %llu files %llu ffree %llu fsid %llu namelen %u\n",
1867 fid->fid, sb->type, sb->bsize, sb->blocks, sb->bfree,
1868 sb->bavail, sb->files, sb->ffree, sb->fsid, sb->namelen);
1870 p9_req_put(clnt, req);
1874 EXPORT_SYMBOL(p9_client_statfs);
1876 int p9_client_rename(struct p9_fid *fid,
1877 struct p9_fid *newdirfid, const char *name)
1880 struct p9_req_t *req;
1881 struct p9_client *clnt;
1886 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1887 fid->fid, newdirfid->fid, name);
1889 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1890 newdirfid->fid, name);
1896 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1898 p9_req_put(clnt, req);
1902 EXPORT_SYMBOL(p9_client_rename);
1904 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1905 struct p9_fid *newdirfid, const char *new_name)
1908 struct p9_req_t *req;
1909 struct p9_client *clnt;
1912 clnt = olddirfid->clnt;
1914 p9_debug(P9_DEBUG_9P,
1915 ">>> TRENAMEAT olddirfid %d old name %s newdirfid %d new name %s\n",
1916 olddirfid->fid, old_name, newdirfid->fid, new_name);
1918 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1919 old_name, newdirfid->fid, new_name);
1925 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1926 newdirfid->fid, new_name);
1928 p9_req_put(clnt, req);
1932 EXPORT_SYMBOL(p9_client_renameat);
1934 /* An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1936 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1937 const char *attr_name, u64 *attr_size)
1940 struct p9_req_t *req;
1941 struct p9_client *clnt;
1942 struct p9_fid *attr_fid;
1945 clnt = file_fid->clnt;
1946 attr_fid = p9_fid_create(clnt);
1951 p9_debug(P9_DEBUG_9P,
1952 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
1953 file_fid->fid, attr_fid->fid, attr_name);
1955 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
1956 file_fid->fid, attr_fid->fid, attr_name);
1961 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size);
1963 trace_9p_protocol_dump(clnt, &req->rc);
1964 p9_req_put(clnt, req);
1967 p9_req_put(clnt, req);
1968 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
1969 attr_fid->fid, *attr_size);
1972 p9_fid_put(attr_fid);
1975 if (attr_fid && attr_fid != file_fid)
1976 p9_fid_destroy(attr_fid);
1978 return ERR_PTR(err);
1980 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
1982 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
1983 u64 attr_size, int flags)
1986 struct p9_req_t *req;
1987 struct p9_client *clnt;
1989 p9_debug(P9_DEBUG_9P,
1990 ">>> TXATTRCREATE fid %d name %s size %llu flag %d\n",
1991 fid->fid, name, attr_size, flags);
1994 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
1995 fid->fid, name, attr_size, flags);
2000 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2001 p9_req_put(clnt, req);
2005 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2007 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2009 int err, rsize, non_zc = 0;
2010 struct p9_client *clnt;
2011 struct p9_req_t *req;
2013 struct kvec kv = {.iov_base = data, .iov_len = count};
2016 iov_iter_kvec(&to, READ, &kv, 1, count);
2018 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2019 fid->fid, offset, count);
2024 rsize = fid->iounit;
2025 if (!rsize || rsize > clnt->msize - P9_READDIRHDRSZ)
2026 rsize = clnt->msize - P9_READDIRHDRSZ;
2031 /* Don't bother zerocopy for small IO (< 1024) */
2032 if (clnt->trans_mod->zc_request && rsize > 1024) {
2033 /* response header len is 11
2034 * PDU Header(7) + IO Size (4)
2036 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0,
2037 11, "dqd", fid->fid, offset, rsize);
2040 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2048 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr);
2050 trace_9p_protocol_dump(clnt, &req->rc);
2051 goto free_and_error;
2053 if (rsize < count) {
2054 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize);
2058 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2061 memmove(data, dataptr, count);
2063 p9_req_put(clnt, req);
2067 p9_req_put(clnt, req);
2071 EXPORT_SYMBOL(p9_client_readdir);
2073 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode,
2074 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2077 struct p9_client *clnt;
2078 struct p9_req_t *req;
2082 p9_debug(P9_DEBUG_9P,
2083 ">>> TMKNOD fid %d name %s mode %d major %d minor %d\n",
2084 fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2085 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", 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",
2096 qid->type, qid->path, qid->version);
2099 p9_req_put(clnt, req);
2102 EXPORT_SYMBOL(p9_client_mknod_dotl);
2104 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode,
2105 kgid_t gid, struct p9_qid *qid)
2108 struct p9_client *clnt;
2109 struct p9_req_t *req;
2113 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2114 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2115 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg",
2116 fid->fid, name, mode, gid);
2118 return PTR_ERR(req);
2120 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
2122 trace_9p_protocol_dump(clnt, &req->rc);
2125 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2126 qid->path, qid->version);
2129 p9_req_put(clnt, req);
2132 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2134 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2137 struct p9_client *clnt;
2138 struct p9_req_t *req;
2142 p9_debug(P9_DEBUG_9P,
2143 ">>> TLOCK fid %d type %i flags %d start %lld length %lld proc_id %d client_id %s\n",
2144 fid->fid, flock->type, flock->flags, flock->start,
2145 flock->length, flock->proc_id, flock->client_id);
2147 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2148 flock->flags, flock->start, flock->length,
2149 flock->proc_id, flock->client_id);
2152 return PTR_ERR(req);
2154 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status);
2156 trace_9p_protocol_dump(clnt, &req->rc);
2159 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2161 p9_req_put(clnt, req);
2164 EXPORT_SYMBOL(p9_client_lock_dotl);
2166 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2169 struct p9_client *clnt;
2170 struct p9_req_t *req;
2174 p9_debug(P9_DEBUG_9P,
2175 ">>> TGETLOCK fid %d, type %i start %lld length %lld proc_id %d client_id %s\n",
2176 fid->fid, glock->type, glock->start, glock->length,
2177 glock->proc_id, glock->client_id);
2179 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid,
2180 glock->type, glock->start, glock->length,
2181 glock->proc_id, glock->client_id);
2184 return PTR_ERR(req);
2186 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type,
2187 &glock->start, &glock->length, &glock->proc_id,
2190 trace_9p_protocol_dump(clnt, &req->rc);
2193 p9_debug(P9_DEBUG_9P,
2194 "<<< RGETLOCK type %i start %lld length %lld proc_id %d client_id %s\n",
2195 glock->type, glock->start, glock->length,
2196 glock->proc_id, glock->client_id);
2198 p9_req_put(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_req_put(clnt, req);
2227 EXPORT_SYMBOL(p9_client_readlink);
2229 int __init p9_client_init(void)
2231 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU);
2232 return p9_req_cache ? 0 : -ENOMEM;
2235 void __exit p9_client_exit(void)
2237 kmem_cache_destroy(p9_req_cache);