1 // SPDX-License-Identifier: GPL-2.0-only
7 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
8 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13 #include <linux/module.h>
14 #include <linux/errno.h>
16 #include <linux/poll.h>
17 #include <linux/idr.h>
18 #include <linux/mutex.h>
19 #include <linux/slab.h>
20 #include <linux/sched/signal.h>
21 #include <linux/uaccess.h>
22 #include <linux/uio.h>
23 #include <net/9p/9p.h>
24 #include <linux/parser.h>
25 #include <linux/seq_file.h>
26 #include <net/9p/client.h>
27 #include <net/9p/transport.h>
30 #define CREATE_TRACE_POINTS
31 #include <trace/events/9p.h>
33 #define DEFAULT_MSIZE (128 * 1024)
35 /* Client Option Parsing (code inspired by NFS code)
36 * - a little lazy - parse all client options
47 static const match_table_t tokens = {
48 {Opt_msize, "msize=%u"},
49 {Opt_legacy, "noextend"},
50 {Opt_trans, "trans=%s"},
51 {Opt_version, "version=%s"},
55 inline int p9_is_proto_dotl(struct p9_client *clnt)
57 return clnt->proto_version == p9_proto_2000L;
59 EXPORT_SYMBOL(p9_is_proto_dotl);
61 inline int p9_is_proto_dotu(struct p9_client *clnt)
63 return clnt->proto_version == p9_proto_2000u;
65 EXPORT_SYMBOL(p9_is_proto_dotu);
67 int p9_show_client_options(struct seq_file *m, struct p9_client *clnt)
69 if (clnt->msize != DEFAULT_MSIZE)
70 seq_printf(m, ",msize=%u", clnt->msize);
71 seq_printf(m, ",trans=%s", clnt->trans_mod->name);
73 switch (clnt->proto_version) {
75 seq_puts(m, ",noextend");
78 seq_puts(m, ",version=9p2000.u");
85 if (clnt->trans_mod->show_options)
86 return clnt->trans_mod->show_options(m, clnt);
89 EXPORT_SYMBOL(p9_show_client_options);
91 /* Some error codes are taken directly from the server replies,
92 * make sure they are valid.
94 static int safe_errno(int err)
96 if (err > 0 || err < -MAX_ERRNO) {
97 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err);
103 /* Interpret mount option for protocol version */
104 static int get_protocol_version(char *s)
106 int version = -EINVAL;
108 if (!strcmp(s, "9p2000")) {
109 version = p9_proto_legacy;
110 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n");
111 } else if (!strcmp(s, "9p2000.u")) {
112 version = p9_proto_2000u;
113 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
114 } else if (!strcmp(s, "9p2000.L")) {
115 version = p9_proto_2000L;
116 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
118 pr_info("Unknown protocol version %s\n", s);
125 * parse_opts - parse mount options into client structure
126 * @opts: options string passed from mount
127 * @clnt: existing v9fs client information
129 * Return 0 upon success, -ERRNO upon failure
132 static int parse_opts(char *opts, struct p9_client *clnt)
134 char *options, *tmp_options;
136 substring_t args[MAX_OPT_ARGS];
141 clnt->proto_version = p9_proto_2000L;
142 clnt->msize = DEFAULT_MSIZE;
147 tmp_options = kstrdup(opts, GFP_KERNEL);
150 options = tmp_options;
152 while ((p = strsep(&options, ",")) != NULL) {
157 token = match_token(p, tokens, args);
160 r = match_int(&args[0], &option);
162 p9_debug(P9_DEBUG_ERROR,
163 "integer field, but no integer?\n");
168 p9_debug(P9_DEBUG_ERROR,
169 "msize should be at least 4k\n");
173 clnt->msize = option;
176 s = match_strdup(&args[0]);
179 p9_debug(P9_DEBUG_ERROR,
180 "problem allocating copy of trans arg\n");
181 goto free_and_return;
184 v9fs_put_trans(clnt->trans_mod);
185 clnt->trans_mod = v9fs_get_trans_by_name(s);
186 if (!clnt->trans_mod) {
187 pr_info("Could not find request transport: %s\n",
194 clnt->proto_version = p9_proto_legacy;
197 s = match_strdup(&args[0]);
200 p9_debug(P9_DEBUG_ERROR,
201 "problem allocating copy of version arg\n");
202 goto free_and_return;
204 r = get_protocol_version(s);
208 clnt->proto_version = r;
218 v9fs_put_trans(clnt->trans_mod);
223 static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc,
226 if (likely(c->fcall_cache) && alloc_msize == c->msize) {
227 fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS);
228 fc->cache = c->fcall_cache;
230 fc->sdata = kmalloc(alloc_msize, GFP_NOFS);
235 fc->capacity = alloc_msize;
239 void p9_fcall_fini(struct p9_fcall *fc)
241 /* sdata can be NULL for interrupted requests in trans_rdma,
242 * and kmem_cache_free does not do NULL-check for us
244 if (unlikely(!fc->sdata))
248 kmem_cache_free(fc->cache, fc->sdata);
252 EXPORT_SYMBOL(p9_fcall_fini);
254 static struct kmem_cache *p9_req_cache;
257 * p9_tag_alloc - Allocate a new request.
258 * @c: Client session.
259 * @type: Transaction type.
260 * @max_size: Maximum packet size for this request.
262 * Context: Process context.
263 * Return: Pointer to new request.
265 static struct p9_req_t *
266 p9_tag_alloc(struct p9_client *c, int8_t type, unsigned int max_size)
268 struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS);
269 int alloc_msize = min(c->msize, max_size);
273 return ERR_PTR(-ENOMEM);
275 if (p9_fcall_init(c, &req->tc, alloc_msize))
277 if (p9_fcall_init(c, &req->rc, alloc_msize))
280 p9pdu_reset(&req->tc);
281 p9pdu_reset(&req->rc);
283 req->status = REQ_STATUS_ALLOC;
284 /* refcount needs to be set to 0 before inserting into the idr
285 * so p9_tag_lookup does not accept a request that is not fully
286 * initialized. refcount_set to 2 below will mark request ready.
288 refcount_set(&req->refcount, 0);
289 init_waitqueue_head(&req->wq);
290 INIT_LIST_HEAD(&req->req_list);
292 idr_preload(GFP_NOFS);
293 spin_lock_irq(&c->lock);
294 if (type == P9_TVERSION)
295 tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1,
298 tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT);
300 spin_unlock_irq(&c->lock);
305 /* Init ref to two because in the general case there is one ref
306 * that is put asynchronously by a writer thread, one ref
307 * temporarily given by p9_tag_lookup and put by p9_client_cb
308 * in the recv thread, and one ref put by p9_tag_remove in the
309 * main thread. The only exception is virtio that does not use
310 * p9_tag_lookup but does not have a writer thread either
311 * (the write happens synchronously in the request/zc_request
312 * callback), so p9_client_cb eats the second ref there
313 * as the pointer is duplicated directly by virtqueue_add_sgs()
315 refcount_set(&req->refcount, 2);
320 p9_fcall_fini(&req->tc);
321 p9_fcall_fini(&req->rc);
323 kmem_cache_free(p9_req_cache, req);
324 return ERR_PTR(-ENOMEM);
328 * p9_tag_lookup - Look up a request by tag.
329 * @c: Client session.
330 * @tag: Transaction ID.
332 * Context: Any context.
333 * Return: A request, or %NULL if there is no request with that tag.
335 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
337 struct p9_req_t *req;
341 req = idr_find(&c->reqs, tag);
343 /* We have to be careful with the req found under rcu_read_lock
344 * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the
345 * ref again without corrupting other data, then check again
346 * that the tag matches once we have the ref
348 if (!p9_req_try_get(req))
350 if (req->tc.tag != tag) {
359 EXPORT_SYMBOL(p9_tag_lookup);
362 * p9_tag_remove - Remove a tag.
363 * @c: Client session.
364 * @r: Request of reference.
366 * Context: Any context.
368 static int p9_tag_remove(struct p9_client *c, struct p9_req_t *r)
373 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
374 spin_lock_irqsave(&c->lock, flags);
375 idr_remove(&c->reqs, tag);
376 spin_unlock_irqrestore(&c->lock, flags);
377 return p9_req_put(c, r);
380 int p9_req_put(struct p9_client *c, struct p9_req_t *r)
382 if (refcount_dec_and_test(&r->refcount)) {
383 p9_fcall_fini(&r->tc);
384 p9_fcall_fini(&r->rc);
385 kmem_cache_free(p9_req_cache, r);
390 EXPORT_SYMBOL(p9_req_put);
393 * p9_tag_cleanup - cleans up tags structure and reclaims resources
394 * @c: v9fs client struct
396 * This frees resources associated with the tags structure
399 static void p9_tag_cleanup(struct p9_client *c)
401 struct p9_req_t *req;
405 idr_for_each_entry(&c->reqs, req, id) {
406 pr_info("Tag %d still in use\n", id);
407 if (p9_tag_remove(c, req) == 0)
408 pr_warn("Packet with tag %d has still references",
415 * p9_client_cb - call back from transport to client
417 * @req: request received
418 * @status: request status, one of REQ_STATUS_*
421 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
423 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag);
425 /* This barrier is needed to make sure any change made to req before
426 * the status change is visible to another thread
429 req->status = status;
432 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag);
435 EXPORT_SYMBOL(p9_client_cb);
438 * p9_parse_header - parse header arguments out of a packet
439 * @pdu: packet to parse
440 * @size: size of packet
441 * @type: type of request
442 * @tag: tag of packet
443 * @rewind: set if we need to rewind offset afterwards
447 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type,
448 int16_t *tag, int rewind)
453 int offset = pdu->offset;
458 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
460 goto rewind_and_exit;
469 if (pdu->size != r_size || r_size < 7) {
471 goto rewind_and_exit;
477 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
478 pdu->size, pdu->id, pdu->tag);
482 pdu->offset = offset;
485 EXPORT_SYMBOL(p9_parse_header);
488 * p9_check_errors - check 9p packet for error return and process it
489 * @c: current client instance
490 * @req: request to parse and check for error conditions
492 * returns error code if one is discovered, otherwise returns 0
494 * this will have to be more complicated if we have multiple
498 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
504 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0);
505 if (req->rc.size >= c->msize) {
506 p9_debug(P9_DEBUG_ERROR,
507 "requested packet size too big: %d\n",
511 /* dump the response from server
512 * This should be after check errors which poplulate pdu_fcall.
514 trace_9p_protocol_dump(c, &req->rc);
516 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
519 if (type != P9_RERROR && type != P9_RLERROR)
522 if (!p9_is_proto_dotl(c)) {
525 err = p9pdu_readf(&req->rc, c->proto_version, "s?d",
530 if (p9_is_proto_dotu(c) && ecode < 512)
534 err = p9_errstr2errno(ename, strlen(ename));
536 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
541 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode);
546 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
552 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
558 * p9_check_zc_errors - check 9p packet for error return and process it
559 * @c: current client instance
560 * @req: request to parse and check for error conditions
561 * @uidata: external buffer containing error
562 * @in_hdrlen: Size of response protocol buffer.
564 * returns error code if one is discovered, otherwise returns 0
566 * this will have to be more complicated if we have multiple
570 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
571 struct iov_iter *uidata, int in_hdrlen)
578 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0);
579 /* dump the response from server
580 * This should be after parse_header which poplulate pdu_fcall.
582 trace_9p_protocol_dump(c, &req->rc);
584 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
588 if (type != P9_RERROR && type != P9_RLERROR)
591 if (!p9_is_proto_dotl(c)) {
592 /* Error is reported in string format */
594 /* 7 = header size for RERROR; */
595 int inline_len = in_hdrlen - 7;
597 len = req->rc.size - req->rc.offset;
598 if (len > (P9_ZC_HDR_SZ - 7)) {
603 ename = &req->rc.sdata[req->rc.offset];
604 if (len > inline_len) {
605 /* We have error in external buffer */
606 if (!copy_from_iter_full(ename + inline_len,
607 len - inline_len, uidata)) {
613 err = p9pdu_readf(&req->rc, c->proto_version, "s?d",
618 if (p9_is_proto_dotu(c) && ecode < 512)
622 err = p9_errstr2errno(ename, strlen(ename));
624 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
629 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode);
632 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
637 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
641 static struct p9_req_t *
642 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
645 * p9_client_flush - flush (cancel) a request
647 * @oldreq: request to cancel
649 * This sents a flush for a particular request and links
650 * the flush request to the original request. The current
651 * code only supports a single flush request although the protocol
652 * allows for multiple flush requests to be sent for a single request.
656 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
658 struct p9_req_t *req;
662 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1);
666 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
668 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
672 /* if we haven't received a response for oldreq,
673 * remove it from the list
675 if (oldreq->status == REQ_STATUS_SENT) {
676 if (c->trans_mod->cancelled)
677 c->trans_mod->cancelled(c, oldreq);
680 p9_tag_remove(c, req);
684 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
685 int8_t type, int req_size,
686 const char *fmt, va_list ap)
689 struct p9_req_t *req;
691 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
693 /* we allow for any status other than disconnected */
694 if (c->status == Disconnected)
695 return ERR_PTR(-EIO);
697 /* if status is begin_disconnected we allow only clunk request */
698 if (c->status == BeginDisconnect && type != P9_TCLUNK)
699 return ERR_PTR(-EIO);
701 req = p9_tag_alloc(c, type, req_size);
705 /* marshall the data */
706 p9pdu_prepare(&req->tc, req->tc.tag, type);
707 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap);
710 p9pdu_finalize(c, &req->tc);
711 trace_9p_client_req(c, type, req->tc.tag);
714 p9_tag_remove(c, req);
715 /* We have to put also the 2nd reference as it won't be used */
721 * p9_client_rpc - issue a request and wait for a response
723 * @type: type of request
724 * @fmt: protocol format string (see protocol.c)
726 * Returns request structure (which client must free using p9_tag_remove)
729 static struct p9_req_t *
730 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
735 struct p9_req_t *req;
738 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
743 if (signal_pending(current)) {
745 clear_thread_flag(TIF_SIGPENDING);
750 err = c->trans_mod->request(c, req);
752 /* write won't happen */
754 if (err != -ERESTARTSYS && err != -EFAULT)
755 c->status = Disconnected;
756 goto recalc_sigpending;
759 /* Wait for the response */
760 err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD);
762 /* Make sure our req is coherent with regard to updates in other
763 * threads - echoes to wmb() in the callback
767 if (err == -ERESTARTSYS && c->status == Connected &&
770 clear_thread_flag(TIF_SIGPENDING);
774 if (req->status == REQ_STATUS_ERROR) {
775 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
778 if (err == -ERESTARTSYS && c->status == Connected) {
779 p9_debug(P9_DEBUG_MUX, "flushing\n");
781 clear_thread_flag(TIF_SIGPENDING);
783 if (c->trans_mod->cancel(c, req))
784 p9_client_flush(c, req);
786 /* if we received the response anyway, don't signal error */
787 if (req->status == REQ_STATUS_RCVD)
792 spin_lock_irqsave(¤t->sighand->siglock, flags);
794 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
799 err = p9_check_errors(c, req);
800 trace_9p_client_res(c, type, req->rc.tag, err);
804 p9_tag_remove(c, req);
805 return ERR_PTR(safe_errno(err));
809 * p9_client_zc_rpc - issue a request and wait for a response
811 * @type: type of request
812 * @uidata: destination for zero copy read
813 * @uodata: source for zero copy write
814 * @inlen: read buffer size
815 * @olen: write buffer size
816 * @in_hdrlen: reader header size, This is the size of response protocol data
817 * @fmt: protocol format string (see protocol.c)
819 * Returns request structure (which client must free using p9_tag_remove)
821 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
822 struct iov_iter *uidata,
823 struct iov_iter *uodata,
824 int inlen, int olen, int in_hdrlen,
825 const char *fmt, ...)
830 struct p9_req_t *req;
833 /* We allocate a inline protocol data of only 4k bytes.
834 * The actual content is passed in zero-copy fashion.
836 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
841 if (signal_pending(current)) {
843 clear_thread_flag(TIF_SIGPENDING);
848 err = c->trans_mod->zc_request(c, req, uidata, uodata,
849 inlen, olen, in_hdrlen);
852 c->status = Disconnected;
853 if (err != -ERESTARTSYS)
854 goto recalc_sigpending;
856 if (req->status == REQ_STATUS_ERROR) {
857 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
860 if (err == -ERESTARTSYS && c->status == Connected) {
861 p9_debug(P9_DEBUG_MUX, "flushing\n");
863 clear_thread_flag(TIF_SIGPENDING);
865 if (c->trans_mod->cancel(c, req))
866 p9_client_flush(c, req);
868 /* if we received the response anyway, don't signal error */
869 if (req->status == REQ_STATUS_RCVD)
874 spin_lock_irqsave(¤t->sighand->siglock, flags);
876 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
881 err = p9_check_zc_errors(c, req, uidata, in_hdrlen);
882 trace_9p_client_res(c, type, req->rc.tag, err);
886 p9_tag_remove(c, req);
887 return ERR_PTR(safe_errno(err));
890 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
895 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
896 fid = kzalloc(sizeof(*fid), GFP_KERNEL);
901 fid->uid = current_fsuid();
903 refcount_set(&fid->count, 1);
905 idr_preload(GFP_KERNEL);
906 spin_lock_irq(&clnt->lock);
907 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1,
909 spin_unlock_irq(&clnt->lock);
918 static void p9_fid_destroy(struct p9_fid *fid)
920 struct p9_client *clnt;
923 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
925 spin_lock_irqsave(&clnt->lock, flags);
926 idr_remove(&clnt->fids, fid->fid);
927 spin_unlock_irqrestore(&clnt->lock, flags);
932 static int p9_client_version(struct p9_client *c)
935 struct p9_req_t *req;
936 char *version = NULL;
939 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
940 c->msize, c->proto_version);
942 switch (c->proto_version) {
944 req = p9_client_rpc(c, P9_TVERSION, "ds",
945 c->msize, "9P2000.L");
948 req = p9_client_rpc(c, P9_TVERSION, "ds",
949 c->msize, "9P2000.u");
951 case p9_proto_legacy:
952 req = p9_client_rpc(c, P9_TVERSION, "ds",
962 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version);
964 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
965 trace_9p_protocol_dump(c, &req->rc);
969 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
970 if (!strncmp(version, "9P2000.L", 8)) {
971 c->proto_version = p9_proto_2000L;
972 } else if (!strncmp(version, "9P2000.u", 8)) {
973 c->proto_version = p9_proto_2000u;
974 } else if (!strncmp(version, "9P2000", 6)) {
975 c->proto_version = p9_proto_legacy;
977 p9_debug(P9_DEBUG_ERROR,
978 "server returned an unknown version: %s\n", version);
984 p9_debug(P9_DEBUG_ERROR,
985 "server returned a msize < 4096: %d\n", msize);
989 if (msize < c->msize)
994 p9_tag_remove(c, req);
999 struct p9_client *p9_client_create(const char *dev_name, char *options)
1002 struct p9_client *clnt;
1006 clnt = kmalloc(sizeof(*clnt), GFP_KERNEL);
1008 return ERR_PTR(-ENOMEM);
1010 clnt->trans_mod = NULL;
1012 clnt->fcall_cache = NULL;
1014 client_id = utsname()->nodename;
1015 memcpy(clnt->name, client_id, strlen(client_id) + 1);
1017 spin_lock_init(&clnt->lock);
1018 idr_init(&clnt->fids);
1019 idr_init(&clnt->reqs);
1021 err = parse_opts(options, clnt);
1025 if (!clnt->trans_mod)
1026 clnt->trans_mod = v9fs_get_default_trans();
1028 if (!clnt->trans_mod) {
1029 err = -EPROTONOSUPPORT;
1030 p9_debug(P9_DEBUG_ERROR,
1031 "No transport defined or default transport\n");
1035 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1036 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1038 err = clnt->trans_mod->create(clnt, dev_name, options);
1042 if (clnt->msize > clnt->trans_mod->maxsize)
1043 clnt->msize = clnt->trans_mod->maxsize;
1045 if (clnt->msize < 4096) {
1046 p9_debug(P9_DEBUG_ERROR,
1047 "Please specify a msize of at least 4k\n");
1052 err = p9_client_version(clnt);
1056 /* P9_HDRSZ + 4 is the smallest packet header we can have that is
1057 * followed by data accessed from userspace by read
1060 kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize,
1062 clnt->msize - (P9_HDRSZ + 4),
1068 clnt->trans_mod->close(clnt);
1070 v9fs_put_trans(clnt->trans_mod);
1073 return ERR_PTR(err);
1075 EXPORT_SYMBOL(p9_client_create);
1077 void p9_client_destroy(struct p9_client *clnt)
1082 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1084 if (clnt->trans_mod)
1085 clnt->trans_mod->close(clnt);
1087 v9fs_put_trans(clnt->trans_mod);
1089 idr_for_each_entry(&clnt->fids, fid, id) {
1090 pr_info("Found fid %d not clunked\n", fid->fid);
1091 p9_fid_destroy(fid);
1094 p9_tag_cleanup(clnt);
1096 kmem_cache_destroy(clnt->fcall_cache);
1099 EXPORT_SYMBOL(p9_client_destroy);
1101 void p9_client_disconnect(struct p9_client *clnt)
1103 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1104 clnt->status = Disconnected;
1106 EXPORT_SYMBOL(p9_client_disconnect);
1108 void p9_client_begin_disconnect(struct p9_client *clnt)
1110 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1111 clnt->status = BeginDisconnect;
1113 EXPORT_SYMBOL(p9_client_begin_disconnect);
1115 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1116 const char *uname, kuid_t n_uname,
1120 struct p9_req_t *req;
1124 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1125 afid ? afid->fid : -1, uname, aname);
1126 fid = p9_fid_create(clnt);
1133 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1134 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1140 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid);
1142 trace_9p_protocol_dump(clnt, &req->rc);
1143 p9_tag_remove(clnt, req);
1147 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1148 qid.type, qid.path, qid.version);
1150 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1152 p9_tag_remove(clnt, req);
1157 p9_fid_destroy(fid);
1158 return ERR_PTR(err);
1160 EXPORT_SYMBOL(p9_client_attach);
1162 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1163 const unsigned char * const *wnames, int clone)
1166 struct p9_client *clnt;
1168 struct p9_qid *wqids;
1169 struct p9_req_t *req;
1174 clnt = oldfid->clnt;
1176 fid = p9_fid_create(clnt);
1182 fid->uid = oldfid->uid;
1187 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1188 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1189 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1196 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1198 trace_9p_protocol_dump(clnt, &req->rc);
1199 p9_tag_remove(clnt, req);
1202 p9_tag_remove(clnt, req);
1204 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1206 if (nwqids != nwname) {
1211 for (count = 0; count < nwqids; count++)
1212 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1213 count, wqids[count].type,
1215 wqids[count].version);
1218 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1220 memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid));
1227 p9_client_clunk(fid);
1231 if (fid && fid != oldfid)
1232 p9_fid_destroy(fid);
1234 return ERR_PTR(err);
1236 EXPORT_SYMBOL(p9_client_walk);
1238 int p9_client_open(struct p9_fid *fid, int mode)
1241 struct p9_client *clnt;
1242 struct p9_req_t *req;
1247 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1248 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1251 if (fid->mode != -1)
1254 if (p9_is_proto_dotl(clnt))
1255 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1257 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1263 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1265 trace_9p_protocol_dump(clnt, &req->rc);
1266 goto free_and_error;
1269 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1270 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1271 qid.path, qid.version, iounit);
1273 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1275 fid->iounit = iounit;
1278 p9_tag_remove(clnt, req);
1282 EXPORT_SYMBOL(p9_client_open);
1284 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags,
1285 u32 mode, kgid_t gid, struct p9_qid *qid)
1288 struct p9_client *clnt;
1289 struct p9_req_t *req;
1292 p9_debug(P9_DEBUG_9P,
1293 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1294 ofid->fid, name, flags, mode,
1295 from_kgid(&init_user_ns, gid));
1298 if (ofid->mode != -1)
1301 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1308 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit);
1310 trace_9p_protocol_dump(clnt, &req->rc);
1311 goto free_and_error;
1314 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1315 qid->type, qid->path, qid->version, iounit);
1317 memmove(&ofid->qid, qid, sizeof(struct p9_qid));
1319 ofid->iounit = iounit;
1322 p9_tag_remove(clnt, req);
1326 EXPORT_SYMBOL(p9_client_create_dotl);
1328 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode,
1332 struct p9_client *clnt;
1333 struct p9_req_t *req;
1337 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1338 fid->fid, name, perm, mode);
1342 if (fid->mode != -1)
1345 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1352 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1354 trace_9p_protocol_dump(clnt, &req->rc);
1355 goto free_and_error;
1358 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1359 qid.type, qid.path, qid.version, iounit);
1361 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1363 fid->iounit = iounit;
1366 p9_tag_remove(clnt, req);
1370 EXPORT_SYMBOL(p9_client_fcreate);
1372 int p9_client_symlink(struct p9_fid *dfid, const char *name,
1373 const char *symtgt, kgid_t gid, struct p9_qid *qid)
1376 struct p9_client *clnt;
1377 struct p9_req_t *req;
1379 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1380 dfid->fid, name, symtgt);
1383 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1390 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
1392 trace_9p_protocol_dump(clnt, &req->rc);
1393 goto free_and_error;
1396 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1397 qid->type, qid->path, qid->version);
1400 p9_tag_remove(clnt, req);
1404 EXPORT_SYMBOL(p9_client_symlink);
1406 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname)
1408 struct p9_client *clnt;
1409 struct p9_req_t *req;
1411 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1412 dfid->fid, oldfid->fid, newname);
1414 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1417 return PTR_ERR(req);
1419 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1420 p9_tag_remove(clnt, req);
1423 EXPORT_SYMBOL(p9_client_link);
1425 int p9_client_fsync(struct p9_fid *fid, int datasync)
1428 struct p9_client *clnt;
1429 struct p9_req_t *req;
1431 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1432 fid->fid, datasync);
1436 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1442 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1444 p9_tag_remove(clnt, req);
1449 EXPORT_SYMBOL(p9_client_fsync);
1451 int p9_client_clunk(struct p9_fid *fid)
1454 struct p9_client *clnt;
1455 struct p9_req_t *req;
1458 if (!fid || IS_ERR(fid)) {
1459 pr_warn("%s (%d): Trying to clunk with invalid fid\n",
1460 __func__, task_pid_nr(current));
1464 if (!refcount_dec_and_test(&fid->count))
1468 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n",
1473 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1479 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1481 p9_tag_remove(clnt, req);
1483 /* Fid is not valid even after a failed clunk
1484 * If interrupted, retry once then give up and
1485 * leak fid until umount.
1487 if (err == -ERESTARTSYS) {
1491 p9_fid_destroy(fid);
1495 EXPORT_SYMBOL(p9_client_clunk);
1497 int p9_client_remove(struct p9_fid *fid)
1500 struct p9_client *clnt;
1501 struct p9_req_t *req;
1503 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1507 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1513 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1515 p9_tag_remove(clnt, req);
1517 if (err == -ERESTARTSYS)
1518 p9_client_clunk(fid);
1520 p9_fid_destroy(fid);
1523 EXPORT_SYMBOL(p9_client_remove);
1525 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1528 struct p9_req_t *req;
1529 struct p9_client *clnt;
1531 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1532 dfid->fid, name, flags);
1535 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1540 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1542 p9_tag_remove(clnt, req);
1546 EXPORT_SYMBOL(p9_client_unlinkat);
1549 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
1554 while (iov_iter_count(to)) {
1557 count = p9_client_read_once(fid, offset, to, err);
1565 EXPORT_SYMBOL(p9_client_read);
1568 p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to,
1571 struct p9_client *clnt = fid->clnt;
1572 struct p9_req_t *req;
1573 int count = iov_iter_count(to);
1574 int rsize, non_zc = 0;
1578 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %zu\n",
1579 fid->fid, offset, iov_iter_count(to));
1581 rsize = fid->iounit;
1582 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ)
1583 rsize = clnt->msize - P9_IOHDRSZ;
1588 /* Don't bother zerocopy for small IO (< 1024) */
1589 if (clnt->trans_mod->zc_request && rsize > 1024) {
1590 /* response header len is 11
1591 * PDU Header(7) + IO Size (4)
1593 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize,
1594 0, 11, "dqd", fid->fid,
1598 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1602 *err = PTR_ERR(req);
1606 *err = p9pdu_readf(&req->rc, clnt->proto_version,
1607 "D", &count, &dataptr);
1609 trace_9p_protocol_dump(clnt, &req->rc);
1610 p9_tag_remove(clnt, req);
1613 if (rsize < count) {
1614 pr_err("bogus RREAD count (%d > %d)\n", count, rsize);
1618 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1621 int n = copy_to_iter(dataptr, count, to);
1625 p9_tag_remove(clnt, req);
1629 iov_iter_advance(to, count);
1631 p9_tag_remove(clnt, req);
1634 EXPORT_SYMBOL(p9_client_read_once);
1637 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
1639 struct p9_client *clnt = fid->clnt;
1640 struct p9_req_t *req;
1644 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n",
1645 fid->fid, offset, iov_iter_count(from));
1647 while (iov_iter_count(from)) {
1648 int count = iov_iter_count(from);
1649 int rsize = fid->iounit;
1651 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ)
1652 rsize = clnt->msize - P9_IOHDRSZ;
1657 /* Don't bother zerocopy for small IO (< 1024) */
1658 if (clnt->trans_mod->zc_request && rsize > 1024) {
1659 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
1660 rsize, P9_ZC_HDR_SZ, "dqd",
1661 fid->fid, offset, rsize);
1663 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
1664 offset, rsize, from);
1667 *err = PTR_ERR(req);
1671 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &count);
1673 trace_9p_protocol_dump(clnt, &req->rc);
1674 p9_tag_remove(clnt, req);
1677 if (rsize < count) {
1678 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize);
1682 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1684 p9_tag_remove(clnt, req);
1685 iov_iter_advance(from, count);
1691 EXPORT_SYMBOL(p9_client_write);
1693 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1696 struct p9_client *clnt;
1697 struct p9_wstat *ret;
1698 struct p9_req_t *req;
1701 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1703 ret = kmalloc(sizeof(*ret), GFP_KERNEL);
1705 return ERR_PTR(-ENOMEM);
1710 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1716 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret);
1718 trace_9p_protocol_dump(clnt, &req->rc);
1719 p9_tag_remove(clnt, req);
1723 p9_debug(P9_DEBUG_9P,
1724 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1725 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1726 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1727 "<<< uid=%d gid=%d n_muid=%d\n",
1728 ret->size, ret->type, ret->dev, ret->qid.type, ret->qid.path,
1729 ret->qid.version, ret->mode,
1730 ret->atime, ret->mtime, ret->length,
1731 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1732 from_kuid(&init_user_ns, ret->n_uid),
1733 from_kgid(&init_user_ns, ret->n_gid),
1734 from_kuid(&init_user_ns, ret->n_muid));
1736 p9_tag_remove(clnt, req);
1741 return ERR_PTR(err);
1743 EXPORT_SYMBOL(p9_client_stat);
1745 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1749 struct p9_client *clnt;
1750 struct p9_stat_dotl *ret;
1751 struct p9_req_t *req;
1753 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1754 fid->fid, request_mask);
1756 ret = kmalloc(sizeof(*ret), GFP_KERNEL);
1758 return ERR_PTR(-ENOMEM);
1763 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1769 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret);
1771 trace_9p_protocol_dump(clnt, &req->rc);
1772 p9_tag_remove(clnt, req);
1776 p9_debug(P9_DEBUG_9P, "<<< RGETATTR st_result_mask=%lld\n"
1777 "<<< qid=%x.%llx.%x\n"
1778 "<<< st_mode=%8.8x st_nlink=%llu\n"
1779 "<<< st_uid=%d st_gid=%d\n"
1780 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1781 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1782 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1783 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1784 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1785 "<<< st_gen=%lld st_data_version=%lld\n",
1786 ret->st_result_mask,
1787 ret->qid.type, ret->qid.path, ret->qid.version,
1788 ret->st_mode, ret->st_nlink,
1789 from_kuid(&init_user_ns, ret->st_uid),
1790 from_kgid(&init_user_ns, ret->st_gid),
1791 ret->st_rdev, ret->st_size, ret->st_blksize, ret->st_blocks,
1792 ret->st_atime_sec, ret->st_atime_nsec,
1793 ret->st_mtime_sec, ret->st_mtime_nsec,
1794 ret->st_ctime_sec, ret->st_ctime_nsec,
1795 ret->st_btime_sec, ret->st_btime_nsec,
1796 ret->st_gen, ret->st_data_version);
1798 p9_tag_remove(clnt, req);
1803 return ERR_PTR(err);
1805 EXPORT_SYMBOL(p9_client_getattr_dotl);
1807 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1811 /* NOTE: size shouldn't include its own length */
1812 /* size[2] type[2] dev[4] qid[13] */
1813 /* mode[4] atime[4] mtime[4] length[8]*/
1814 /* name[s] uid[s] gid[s] muid[s] */
1815 ret = 2 + 4 + 13 + 4 + 4 + 4 + 8 + 2 + 2 + 2 + 2;
1818 ret += strlen(wst->name);
1820 ret += strlen(wst->uid);
1822 ret += strlen(wst->gid);
1824 ret += strlen(wst->muid);
1826 if (proto_version == p9_proto_2000u ||
1827 proto_version == p9_proto_2000L) {
1828 /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1829 ret += 2 + 4 + 4 + 4;
1831 ret += strlen(wst->extension);
1837 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1840 struct p9_req_t *req;
1841 struct p9_client *clnt;
1845 wst->size = p9_client_statsize(wst, clnt->proto_version);
1846 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n",
1848 p9_debug(P9_DEBUG_9P,
1849 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1850 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1851 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1852 " uid=%d gid=%d n_muid=%d\n",
1853 wst->size, wst->type, wst->dev, wst->qid.type,
1854 wst->qid.path, wst->qid.version,
1855 wst->mode, wst->atime, wst->mtime, wst->length,
1856 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1857 from_kuid(&init_user_ns, wst->n_uid),
1858 from_kgid(&init_user_ns, wst->n_gid),
1859 from_kuid(&init_user_ns, wst->n_muid));
1861 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS",
1862 fid->fid, wst->size + 2, wst);
1868 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1870 p9_tag_remove(clnt, req);
1874 EXPORT_SYMBOL(p9_client_wstat);
1876 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1879 struct p9_req_t *req;
1880 struct p9_client *clnt;
1884 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1885 p9_debug(P9_DEBUG_9P, " valid=%x mode=%x uid=%d gid=%d size=%lld\n",
1886 p9attr->valid, p9attr->mode,
1887 from_kuid(&init_user_ns, p9attr->uid),
1888 from_kgid(&init_user_ns, p9attr->gid),
1890 p9_debug(P9_DEBUG_9P, " atime_sec=%lld atime_nsec=%lld\n",
1891 p9attr->atime_sec, p9attr->atime_nsec);
1892 p9_debug(P9_DEBUG_9P, " mtime_sec=%lld mtime_nsec=%lld\n",
1893 p9attr->mtime_sec, p9attr->mtime_nsec);
1895 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1901 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1902 p9_tag_remove(clnt, req);
1906 EXPORT_SYMBOL(p9_client_setattr);
1908 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1911 struct p9_req_t *req;
1912 struct p9_client *clnt;
1917 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1919 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1925 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1926 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1927 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1929 trace_9p_protocol_dump(clnt, &req->rc);
1930 p9_tag_remove(clnt, req);
1934 p9_debug(P9_DEBUG_9P,
1935 "<<< RSTATFS fid %d type 0x%x bsize %u blocks %llu bfree %llu bavail %llu files %llu ffree %llu fsid %llu namelen %u\n",
1936 fid->fid, sb->type, sb->bsize, sb->blocks, sb->bfree,
1937 sb->bavail, sb->files, sb->ffree, sb->fsid, sb->namelen);
1939 p9_tag_remove(clnt, req);
1943 EXPORT_SYMBOL(p9_client_statfs);
1945 int p9_client_rename(struct p9_fid *fid,
1946 struct p9_fid *newdirfid, const char *name)
1949 struct p9_req_t *req;
1950 struct p9_client *clnt;
1955 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1956 fid->fid, newdirfid->fid, name);
1958 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1959 newdirfid->fid, name);
1965 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1967 p9_tag_remove(clnt, req);
1971 EXPORT_SYMBOL(p9_client_rename);
1973 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1974 struct p9_fid *newdirfid, const char *new_name)
1977 struct p9_req_t *req;
1978 struct p9_client *clnt;
1981 clnt = olddirfid->clnt;
1983 p9_debug(P9_DEBUG_9P,
1984 ">>> TRENAMEAT olddirfid %d old name %s newdirfid %d new name %s\n",
1985 olddirfid->fid, old_name, newdirfid->fid, new_name);
1987 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1988 old_name, newdirfid->fid, new_name);
1994 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1995 newdirfid->fid, new_name);
1997 p9_tag_remove(clnt, req);
2001 EXPORT_SYMBOL(p9_client_renameat);
2003 /* An xattrwalk without @attr_name gives the fid for the lisxattr namespace
2005 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
2006 const char *attr_name, u64 *attr_size)
2009 struct p9_req_t *req;
2010 struct p9_client *clnt;
2011 struct p9_fid *attr_fid;
2014 clnt = file_fid->clnt;
2015 attr_fid = p9_fid_create(clnt);
2020 p9_debug(P9_DEBUG_9P,
2021 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2022 file_fid->fid, attr_fid->fid, attr_name);
2024 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2025 file_fid->fid, attr_fid->fid, attr_name);
2030 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size);
2032 trace_9p_protocol_dump(clnt, &req->rc);
2033 p9_tag_remove(clnt, req);
2036 p9_tag_remove(clnt, req);
2037 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2038 attr_fid->fid, *attr_size);
2041 p9_client_clunk(attr_fid);
2044 if (attr_fid && attr_fid != file_fid)
2045 p9_fid_destroy(attr_fid);
2047 return ERR_PTR(err);
2049 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2051 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2052 u64 attr_size, int flags)
2055 struct p9_req_t *req;
2056 struct p9_client *clnt;
2058 p9_debug(P9_DEBUG_9P,
2059 ">>> TXATTRCREATE fid %d name %s size %llu flag %d\n",
2060 fid->fid, name, attr_size, flags);
2063 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2064 fid->fid, name, attr_size, flags);
2069 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2070 p9_tag_remove(clnt, req);
2074 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2076 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2078 int err, rsize, non_zc = 0;
2079 struct p9_client *clnt;
2080 struct p9_req_t *req;
2082 struct kvec kv = {.iov_base = data, .iov_len = count};
2085 iov_iter_kvec(&to, READ, &kv, 1, count);
2087 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2088 fid->fid, offset, count);
2093 rsize = fid->iounit;
2094 if (!rsize || rsize > clnt->msize - P9_READDIRHDRSZ)
2095 rsize = clnt->msize - P9_READDIRHDRSZ;
2100 /* Don't bother zerocopy for small IO (< 1024) */
2101 if (clnt->trans_mod->zc_request && rsize > 1024) {
2102 /* response header len is 11
2103 * PDU Header(7) + IO Size (4)
2105 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0,
2106 11, "dqd", fid->fid, offset, rsize);
2109 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2117 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr);
2119 trace_9p_protocol_dump(clnt, &req->rc);
2120 goto free_and_error;
2122 if (rsize < count) {
2123 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize);
2127 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2130 memmove(data, dataptr, count);
2132 p9_tag_remove(clnt, req);
2136 p9_tag_remove(clnt, req);
2140 EXPORT_SYMBOL(p9_client_readdir);
2142 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode,
2143 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2146 struct p9_client *clnt;
2147 struct p9_req_t *req;
2151 p9_debug(P9_DEBUG_9P,
2152 ">>> TMKNOD fid %d name %s mode %d major %d minor %d\n",
2153 fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2154 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2155 MAJOR(rdev), MINOR(rdev), gid);
2157 return PTR_ERR(req);
2159 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
2161 trace_9p_protocol_dump(clnt, &req->rc);
2164 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n",
2165 qid->type, qid->path, qid->version);
2168 p9_tag_remove(clnt, req);
2171 EXPORT_SYMBOL(p9_client_mknod_dotl);
2173 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode,
2174 kgid_t gid, struct p9_qid *qid)
2177 struct p9_client *clnt;
2178 struct p9_req_t *req;
2182 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2183 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2184 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg",
2185 fid->fid, name, mode, gid);
2187 return PTR_ERR(req);
2189 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
2191 trace_9p_protocol_dump(clnt, &req->rc);
2194 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2195 qid->path, qid->version);
2198 p9_tag_remove(clnt, req);
2201 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2203 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2206 struct p9_client *clnt;
2207 struct p9_req_t *req;
2211 p9_debug(P9_DEBUG_9P,
2212 ">>> TLOCK fid %d type %i flags %d start %lld length %lld proc_id %d client_id %s\n",
2213 fid->fid, flock->type, flock->flags, flock->start,
2214 flock->length, flock->proc_id, flock->client_id);
2216 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2217 flock->flags, flock->start, flock->length,
2218 flock->proc_id, flock->client_id);
2221 return PTR_ERR(req);
2223 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status);
2225 trace_9p_protocol_dump(clnt, &req->rc);
2228 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2230 p9_tag_remove(clnt, req);
2233 EXPORT_SYMBOL(p9_client_lock_dotl);
2235 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2238 struct p9_client *clnt;
2239 struct p9_req_t *req;
2243 p9_debug(P9_DEBUG_9P,
2244 ">>> TGETLOCK fid %d, type %i start %lld length %lld proc_id %d client_id %s\n",
2245 fid->fid, glock->type, glock->start, glock->length,
2246 glock->proc_id, glock->client_id);
2248 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid,
2249 glock->type, glock->start, glock->length,
2250 glock->proc_id, glock->client_id);
2253 return PTR_ERR(req);
2255 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type,
2256 &glock->start, &glock->length, &glock->proc_id,
2259 trace_9p_protocol_dump(clnt, &req->rc);
2262 p9_debug(P9_DEBUG_9P,
2263 "<<< RGETLOCK type %i start %lld length %lld proc_id %d client_id %s\n",
2264 glock->type, glock->start, glock->length,
2265 glock->proc_id, glock->client_id);
2267 p9_tag_remove(clnt, req);
2270 EXPORT_SYMBOL(p9_client_getlock_dotl);
2272 int p9_client_readlink(struct p9_fid *fid, char **target)
2275 struct p9_client *clnt;
2276 struct p9_req_t *req;
2280 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2282 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2284 return PTR_ERR(req);
2286 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target);
2288 trace_9p_protocol_dump(clnt, &req->rc);
2291 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2293 p9_tag_remove(clnt, req);
2296 EXPORT_SYMBOL(p9_client_readlink);
2298 int __init p9_client_init(void)
2300 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU);
2301 return p9_req_cache ? 0 : -ENOMEM;
2304 void __exit p9_client_exit(void)
2306 kmem_cache_destroy(p9_req_cache);