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>
34 * Client Option Parsing (code inspired by NFS code)
35 * - a little lazy - parse all client options
46 static const match_table_t tokens = {
47 {Opt_msize, "msize=%u"},
48 {Opt_legacy, "noextend"},
49 {Opt_trans, "trans=%s"},
50 {Opt_version, "version=%s"},
54 inline int p9_is_proto_dotl(struct p9_client *clnt)
56 return clnt->proto_version == p9_proto_2000L;
58 EXPORT_SYMBOL(p9_is_proto_dotl);
60 inline int p9_is_proto_dotu(struct p9_client *clnt)
62 return clnt->proto_version == p9_proto_2000u;
64 EXPORT_SYMBOL(p9_is_proto_dotu);
66 int p9_show_client_options(struct seq_file *m, struct p9_client *clnt)
68 if (clnt->msize != 8192)
69 seq_printf(m, ",msize=%u", clnt->msize);
70 seq_printf(m, ",trans=%s", clnt->trans_mod->name);
72 switch (clnt->proto_version) {
74 seq_puts(m, ",noextend");
77 seq_puts(m, ",version=9p2000.u");
84 if (clnt->trans_mod->show_options)
85 return clnt->trans_mod->show_options(m, clnt);
88 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);
104 /* Interpret mount option for protocol version */
105 static int get_protocol_version(char *s)
107 int version = -EINVAL;
109 if (!strcmp(s, "9p2000")) {
110 version = p9_proto_legacy;
111 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n");
112 } else if (!strcmp(s, "9p2000.u")) {
113 version = p9_proto_2000u;
114 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
115 } else if (!strcmp(s, "9p2000.L")) {
116 version = p9_proto_2000L;
117 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
119 pr_info("Unknown protocol version %s\n", s);
125 * parse_options - 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;
147 tmp_options = kstrdup(opts, GFP_KERNEL);
149 p9_debug(P9_DEBUG_ERROR,
150 "failed to allocate copy of option string\n");
153 options = tmp_options;
155 while ((p = strsep(&options, ",")) != NULL) {
159 token = match_token(p, tokens, args);
162 r = match_int(&args[0], &option);
164 p9_debug(P9_DEBUG_ERROR,
165 "integer field, but no integer?\n");
170 p9_debug(P9_DEBUG_ERROR,
171 "msize should be at least 4k\n");
175 clnt->msize = option;
178 s = match_strdup(&args[0]);
181 p9_debug(P9_DEBUG_ERROR,
182 "problem allocating copy of trans arg\n");
183 goto free_and_return;
186 v9fs_put_trans(clnt->trans_mod);
187 clnt->trans_mod = v9fs_get_trans_by_name(s);
188 if (clnt->trans_mod == NULL) {
189 pr_info("Could not find request transport: %s\n",
196 clnt->proto_version = p9_proto_legacy;
199 s = match_strdup(&args[0]);
202 p9_debug(P9_DEBUG_ERROR,
203 "problem allocating copy of version arg\n");
204 goto free_and_return;
206 r = get_protocol_version(s);
210 clnt->proto_version = r;
220 v9fs_put_trans(clnt->trans_mod);
225 static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc,
228 if (likely(c->fcall_cache) && alloc_msize == c->msize) {
229 fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS);
230 fc->cache = c->fcall_cache;
232 fc->sdata = kmalloc(alloc_msize, GFP_NOFS);
237 fc->capacity = alloc_msize;
241 void p9_fcall_fini(struct p9_fcall *fc)
243 /* sdata can be NULL for interrupted requests in trans_rdma,
244 * and kmem_cache_free does not do NULL-check for us
246 if (unlikely(!fc->sdata))
250 kmem_cache_free(fc->cache, fc->sdata);
254 EXPORT_SYMBOL(p9_fcall_fini);
256 static struct kmem_cache *p9_req_cache;
259 * p9_req_alloc - Allocate a new request.
260 * @c: Client session.
261 * @type: Transaction type.
262 * @max_size: Maximum packet size for this request.
264 * Context: Process context.
265 * Return: Pointer to new request.
267 static struct p9_req_t *
268 p9_tag_alloc(struct p9_client *c, int8_t type, unsigned int max_size)
270 struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS);
271 int alloc_msize = min(c->msize, max_size);
275 return ERR_PTR(-ENOMEM);
277 if (p9_fcall_init(c, &req->tc, alloc_msize))
279 if (p9_fcall_init(c, &req->rc, alloc_msize))
282 p9pdu_reset(&req->tc);
283 p9pdu_reset(&req->rc);
285 req->status = REQ_STATUS_ALLOC;
286 init_waitqueue_head(&req->wq);
287 INIT_LIST_HEAD(&req->req_list);
289 idr_preload(GFP_NOFS);
290 spin_lock_irq(&c->lock);
291 if (type == P9_TVERSION)
292 tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1,
295 tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT);
297 spin_unlock_irq(&c->lock);
302 /* Init ref to two because in the general case there is one ref
303 * that is put asynchronously by a writer thread, one ref
304 * temporarily given by p9_tag_lookup and put by p9_client_cb
305 * in the recv thread, and one ref put by p9_tag_remove in the
306 * main thread. The only exception is virtio that does not use
307 * p9_tag_lookup but does not have a writer thread either
308 * (the write happens synchronously in the request/zc_request
309 * callback), so p9_client_cb eats the second ref there
310 * as the pointer is duplicated directly by virtqueue_add_sgs()
312 refcount_set(&req->refcount.refcount, 2);
317 p9_fcall_fini(&req->tc);
318 p9_fcall_fini(&req->rc);
320 kmem_cache_free(p9_req_cache, req);
321 return ERR_PTR(-ENOMEM);
325 * p9_tag_lookup - Look up a request by tag.
326 * @c: Client session.
327 * @tag: Transaction ID.
329 * Context: Any context.
330 * Return: A request, or %NULL if there is no request with that tag.
332 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
334 struct p9_req_t *req;
338 req = idr_find(&c->reqs, tag);
340 /* We have to be careful with the req found under rcu_read_lock
341 * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the
342 * ref again without corrupting other data, then check again
343 * that the tag matches once we have the ref
345 if (!p9_req_try_get(req))
347 if (req->tc.tag != tag) {
356 EXPORT_SYMBOL(p9_tag_lookup);
359 * p9_tag_remove - Remove a tag.
360 * @c: Client session.
361 * @r: Request of reference.
363 * Context: Any context.
365 static int p9_tag_remove(struct p9_client *c, struct p9_req_t *r)
370 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
371 spin_lock_irqsave(&c->lock, flags);
372 idr_remove(&c->reqs, tag);
373 spin_unlock_irqrestore(&c->lock, flags);
374 return p9_req_put(r);
377 static void p9_req_free(struct kref *ref)
379 struct p9_req_t *r = container_of(ref, struct p9_req_t, refcount);
380 p9_fcall_fini(&r->tc);
381 p9_fcall_fini(&r->rc);
382 kmem_cache_free(p9_req_cache, r);
385 int p9_req_put(struct p9_req_t *r)
387 return kref_put(&r->refcount, p9_req_free);
389 EXPORT_SYMBOL(p9_req_put);
392 * p9_tag_cleanup - cleans up tags structure and reclaims resources
393 * @c: v9fs client struct
395 * This frees resources associated with the tags structure
398 static void p9_tag_cleanup(struct p9_client *c)
400 struct p9_req_t *req;
404 idr_for_each_entry(&c->reqs, req, id) {
405 pr_info("Tag %d still in use\n", id);
406 if (p9_tag_remove(c, req) == 0)
407 pr_warn("Packet with tag %d has still references",
414 * p9_client_cb - call back from transport to client
416 * req: request received
419 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
421 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag);
424 * This barrier is needed to make sure any change made to req before
425 * the status change is visible to another thread
428 req->status = status;
431 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag);
434 EXPORT_SYMBOL(p9_client_cb);
437 * p9_parse_header - parse header arguments out of a packet
438 * @pdu: packet to parse
439 * @size: size of packet
440 * @type: type of request
441 * @tag: tag of packet
442 * @rewind: set if we need to rewind offset afterwards
446 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
452 int offset = pdu->offset;
457 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
459 goto rewind_and_exit;
468 if (pdu->size != r_size || r_size < 7) {
470 goto rewind_and_exit;
476 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
477 pdu->size, pdu->id, pdu->tag);
481 pdu->offset = offset;
484 EXPORT_SYMBOL(p9_parse_header);
487 * p9_check_errors - check 9p packet for error return and process it
488 * @c: current client instance
489 * @req: request to parse and check for error conditions
491 * returns error code if one is discovered, otherwise returns 0
493 * this will have to be more complicated if we have multiple
497 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
503 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0);
504 if (req->rc.size >= c->msize) {
505 p9_debug(P9_DEBUG_ERROR,
506 "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",
532 if (p9_is_proto_dotu(c) && ecode < 512)
536 err = p9_errstr2errno(ename, strlen(ename));
538 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
543 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode);
548 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
554 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
560 * p9_check_zc_errors - check 9p packet for error return and process it
561 * @c: current client instance
562 * @req: request to parse and check for error conditions
563 * @in_hdrlen: Size of response protocol buffer.
565 * returns error code if one is discovered, otherwise returns 0
567 * this will have to be more complicated if we have multiple
571 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
572 struct iov_iter *uidata, int in_hdrlen)
579 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0);
581 * dump the response from server
582 * This should be after parse_header which poplulate pdu_fcall.
584 trace_9p_protocol_dump(c, &req->rc);
586 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
590 if (type != P9_RERROR && type != P9_RLERROR)
593 if (!p9_is_proto_dotl(c)) {
594 /* Error is reported in string format */
596 /* 7 = header size for RERROR; */
597 int inline_len = in_hdrlen - 7;
599 len = req->rc.size - req->rc.offset;
600 if (len > (P9_ZC_HDR_SZ - 7)) {
605 ename = &req->rc.sdata[req->rc.offset];
606 if (len > inline_len) {
607 /* We have error in external buffer */
608 if (!copy_from_iter_full(ename + inline_len,
609 len - inline_len, uidata)) {
615 err = p9pdu_readf(&req->rc, c->proto_version, "s?d",
620 if (p9_is_proto_dotu(c) && ecode < 512)
624 err = p9_errstr2errno(ename, strlen(ename));
626 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
631 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode);
634 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
639 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
643 static struct p9_req_t *
644 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
647 * p9_client_flush - flush (cancel) a request
649 * @oldreq: request to cancel
651 * This sents a flush for a particular request and links
652 * the flush request to the original request. The current
653 * code only supports a single flush request although the protocol
654 * allows for multiple flush requests to be sent for a single request.
658 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
660 struct p9_req_t *req;
664 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1);
668 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
670 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
675 * if we haven't received a response for oldreq,
676 * remove it from the list
678 if (oldreq->status == REQ_STATUS_SENT) {
679 if (c->trans_mod->cancelled)
680 c->trans_mod->cancelled(c, oldreq);
683 p9_tag_remove(c, req);
687 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
688 int8_t type, int req_size,
689 const char *fmt, va_list ap)
692 struct p9_req_t *req;
694 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
696 /* we allow for any status other than disconnected */
697 if (c->status == Disconnected)
698 return ERR_PTR(-EIO);
700 /* if status is begin_disconnected we allow only clunk request */
701 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
702 return ERR_PTR(-EIO);
704 req = p9_tag_alloc(c, type, req_size);
708 /* marshall the data */
709 p9pdu_prepare(&req->tc, req->tc.tag, type);
710 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap);
713 p9pdu_finalize(c, &req->tc);
714 trace_9p_client_req(c, type, req->tc.tag);
717 p9_tag_remove(c, req);
718 /* We have to put also the 2nd reference as it won't be used */
724 * p9_client_rpc - issue a request and wait for a response
726 * @type: type of request
727 * @fmt: protocol format string (see protocol.c)
729 * Returns request structure (which client must free using p9_tag_remove)
732 static struct p9_req_t *
733 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
738 struct p9_req_t *req;
741 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
746 if (signal_pending(current)) {
748 clear_thread_flag(TIF_SIGPENDING);
752 err = c->trans_mod->request(c, req);
754 /* write won't happen */
756 if (err != -ERESTARTSYS && err != -EFAULT)
757 c->status = Disconnected;
758 goto recalc_sigpending;
761 /* Wait for the response */
762 err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD);
765 * Make sure our req is coherent with regard to updates in other
766 * threads - echoes to wmb() in the callback
770 if ((err == -ERESTARTSYS) && (c->status == Connected)
771 && (type == P9_TFLUSH)) {
773 clear_thread_flag(TIF_SIGPENDING);
777 if (req->status == REQ_STATUS_ERROR) {
778 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
781 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
782 p9_debug(P9_DEBUG_MUX, "flushing\n");
784 clear_thread_flag(TIF_SIGPENDING);
786 if (c->trans_mod->cancel(c, req))
787 p9_client_flush(c, req);
789 /* if we received the response anyway, don't signal error */
790 if (req->status == REQ_STATUS_RCVD)
795 spin_lock_irqsave(¤t->sighand->siglock, flags);
797 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
802 err = p9_check_errors(c, req);
803 trace_9p_client_res(c, type, req->rc.tag, err);
807 p9_tag_remove(c, req);
808 return ERR_PTR(safe_errno(err));
812 * p9_client_zc_rpc - issue a request and wait for a response
814 * @type: type of request
815 * @uidata: destination for zero copy read
816 * @uodata: source for zero copy write
817 * @inlen: read buffer size
818 * @olen: write buffer size
819 * @in_hdrlen: reader header size, This is the size of response protocol data
820 * @fmt: protocol format string (see protocol.c)
822 * Returns request structure (which client must free using p9_tag_remove)
824 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
825 struct iov_iter *uidata,
826 struct iov_iter *uodata,
827 int inlen, int olen, int in_hdrlen,
828 const char *fmt, ...)
833 struct p9_req_t *req;
837 * We allocate a inline protocol data of only 4k bytes.
838 * The actual content is passed in zero-copy fashion.
840 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
845 if (signal_pending(current)) {
847 clear_thread_flag(TIF_SIGPENDING);
851 err = c->trans_mod->zc_request(c, req, uidata, uodata,
852 inlen, olen, in_hdrlen);
855 c->status = Disconnected;
856 if (err != -ERESTARTSYS)
857 goto recalc_sigpending;
859 if (req->status == REQ_STATUS_ERROR) {
860 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
863 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
864 p9_debug(P9_DEBUG_MUX, "flushing\n");
866 clear_thread_flag(TIF_SIGPENDING);
868 if (c->trans_mod->cancel(c, req))
869 p9_client_flush(c, req);
871 /* if we received the response anyway, don't signal error */
872 if (req->status == REQ_STATUS_RCVD)
877 spin_lock_irqsave(¤t->sighand->siglock, flags);
879 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
884 err = p9_check_zc_errors(c, req, uidata, in_hdrlen);
885 trace_9p_client_res(c, type, req->rc.tag, err);
889 p9_tag_remove(c, req);
890 return ERR_PTR(safe_errno(err));
893 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
898 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
899 fid = kzalloc(sizeof(struct p9_fid), GFP_KERNEL);
904 fid->uid = current_fsuid();
907 idr_preload(GFP_KERNEL);
908 spin_lock_irq(&clnt->lock);
909 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1,
911 spin_unlock_irq(&clnt->lock);
921 static void p9_fid_destroy(struct p9_fid *fid)
923 struct p9_client *clnt;
926 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
928 spin_lock_irqsave(&clnt->lock, flags);
929 idr_remove(&clnt->fids, fid->fid);
930 spin_unlock_irqrestore(&clnt->lock, flags);
935 static int p9_client_version(struct p9_client *c)
938 struct p9_req_t *req;
939 char *version = NULL;
942 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
943 c->msize, c->proto_version);
945 switch (c->proto_version) {
947 req = p9_client_rpc(c, P9_TVERSION, "ds",
948 c->msize, "9P2000.L");
951 req = p9_client_rpc(c, P9_TVERSION, "ds",
952 c->msize, "9P2000.u");
954 case p9_proto_legacy:
955 req = p9_client_rpc(c, P9_TVERSION, "ds",
965 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version);
967 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
968 trace_9p_protocol_dump(c, &req->rc);
972 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
973 if (!strncmp(version, "9P2000.L", 8))
974 c->proto_version = p9_proto_2000L;
975 else if (!strncmp(version, "9P2000.u", 8))
976 c->proto_version = p9_proto_2000u;
977 else if (!strncmp(version, "9P2000", 6))
978 c->proto_version = p9_proto_legacy;
980 p9_debug(P9_DEBUG_ERROR,
981 "server returned an unknown version: %s\n", version);
987 p9_debug(P9_DEBUG_ERROR,
988 "server returned a msize < 4096: %d\n", msize);
992 if (msize < c->msize)
997 p9_tag_remove(c, req);
1002 struct p9_client *p9_client_create(const char *dev_name, char *options)
1005 struct p9_client *clnt;
1009 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
1011 return ERR_PTR(-ENOMEM);
1013 clnt->trans_mod = NULL;
1015 clnt->fcall_cache = NULL;
1017 client_id = utsname()->nodename;
1018 memcpy(clnt->name, client_id, strlen(client_id) + 1);
1020 spin_lock_init(&clnt->lock);
1021 idr_init(&clnt->fids);
1022 idr_init(&clnt->reqs);
1024 err = parse_opts(options, clnt);
1028 if (!clnt->trans_mod)
1029 clnt->trans_mod = v9fs_get_default_trans();
1031 if (clnt->trans_mod == NULL) {
1032 err = -EPROTONOSUPPORT;
1033 p9_debug(P9_DEBUG_ERROR,
1034 "No transport defined or default transport\n");
1038 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1039 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1041 err = clnt->trans_mod->create(clnt, dev_name, options);
1045 if (clnt->msize > clnt->trans_mod->maxsize)
1046 clnt->msize = clnt->trans_mod->maxsize;
1048 if (clnt->msize < 4096) {
1049 p9_debug(P9_DEBUG_ERROR,
1050 "Please specify a msize of at least 4k\n");
1055 err = p9_client_version(clnt);
1059 /* P9_HDRSZ + 4 is the smallest packet header we can have that is
1060 * followed by data accessed from userspace by read
1063 kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize,
1065 clnt->msize - (P9_HDRSZ + 4),
1071 clnt->trans_mod->close(clnt);
1073 v9fs_put_trans(clnt->trans_mod);
1076 return ERR_PTR(err);
1078 EXPORT_SYMBOL(p9_client_create);
1080 void p9_client_destroy(struct p9_client *clnt)
1085 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1087 if (clnt->trans_mod)
1088 clnt->trans_mod->close(clnt);
1090 v9fs_put_trans(clnt->trans_mod);
1092 idr_for_each_entry(&clnt->fids, fid, id) {
1093 pr_info("Found fid %d not clunked\n", fid->fid);
1094 p9_fid_destroy(fid);
1097 p9_tag_cleanup(clnt);
1099 kmem_cache_destroy(clnt->fcall_cache);
1102 EXPORT_SYMBOL(p9_client_destroy);
1104 void p9_client_disconnect(struct p9_client *clnt)
1106 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1107 clnt->status = Disconnected;
1109 EXPORT_SYMBOL(p9_client_disconnect);
1111 void p9_client_begin_disconnect(struct p9_client *clnt)
1113 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1114 clnt->status = BeginDisconnect;
1116 EXPORT_SYMBOL(p9_client_begin_disconnect);
1118 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1119 const char *uname, kuid_t n_uname, const char *aname)
1122 struct p9_req_t *req;
1127 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1128 afid ? afid->fid : -1, uname, aname);
1129 fid = p9_fid_create(clnt);
1136 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1137 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1143 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid);
1145 trace_9p_protocol_dump(clnt, &req->rc);
1146 p9_tag_remove(clnt, req);
1150 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1151 qid.type, (unsigned long long)qid.path, qid.version);
1153 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1155 p9_tag_remove(clnt, req);
1160 p9_fid_destroy(fid);
1161 return ERR_PTR(err);
1163 EXPORT_SYMBOL(p9_client_attach);
1165 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1166 const unsigned char * const *wnames, int clone)
1169 struct p9_client *clnt;
1171 struct p9_qid *wqids;
1172 struct p9_req_t *req;
1173 uint16_t nwqids, count;
1177 clnt = oldfid->clnt;
1179 fid = p9_fid_create(clnt);
1185 fid->uid = oldfid->uid;
1190 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1191 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1193 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1200 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1202 trace_9p_protocol_dump(clnt, &req->rc);
1203 p9_tag_remove(clnt, req);
1206 p9_tag_remove(clnt, req);
1208 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1210 if (nwqids != nwname) {
1215 for (count = 0; count < nwqids; count++)
1216 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1217 count, wqids[count].type,
1218 (unsigned long long)wqids[count].path,
1219 wqids[count].version);
1222 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1224 fid->qid = oldfid->qid;
1231 p9_client_clunk(fid);
1235 if (fid && (fid != oldfid))
1236 p9_fid_destroy(fid);
1238 return ERR_PTR(err);
1240 EXPORT_SYMBOL(p9_client_walk);
1242 int p9_client_open(struct p9_fid *fid, int mode)
1245 struct p9_client *clnt;
1246 struct p9_req_t *req;
1251 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1252 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1255 if (fid->mode != -1)
1258 if (p9_is_proto_dotl(clnt))
1259 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1261 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1267 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1269 trace_9p_protocol_dump(clnt, &req->rc);
1270 goto free_and_error;
1273 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1274 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1275 (unsigned long long)qid.path, qid.version, iounit);
1278 fid->iounit = iounit;
1281 p9_tag_remove(clnt, req);
1285 EXPORT_SYMBOL(p9_client_open);
1287 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode,
1288 kgid_t gid, struct p9_qid *qid)
1291 struct p9_client *clnt;
1292 struct p9_req_t *req;
1295 p9_debug(P9_DEBUG_9P,
1296 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1297 ofid->fid, name, flags, mode,
1298 from_kgid(&init_user_ns, gid));
1301 if (ofid->mode != -1)
1304 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1311 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit);
1313 trace_9p_protocol_dump(clnt, &req->rc);
1314 goto free_and_error;
1317 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1319 (unsigned long long)qid->path,
1320 qid->version, iounit);
1323 ofid->iounit = iounit;
1326 p9_tag_remove(clnt, req);
1330 EXPORT_SYMBOL(p9_client_create_dotl);
1332 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode,
1336 struct p9_client *clnt;
1337 struct p9_req_t *req;
1341 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1342 fid->fid, name, perm, mode);
1346 if (fid->mode != -1)
1349 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1356 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1358 trace_9p_protocol_dump(clnt, &req->rc);
1359 goto free_and_error;
1362 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1364 (unsigned long long)qid.path,
1365 qid.version, iounit);
1368 fid->iounit = iounit;
1371 p9_tag_remove(clnt, req);
1375 EXPORT_SYMBOL(p9_client_fcreate);
1377 int p9_client_symlink(struct p9_fid *dfid, const char *name,
1378 const char *symtgt, kgid_t gid, struct p9_qid *qid)
1381 struct p9_client *clnt;
1382 struct p9_req_t *req;
1384 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1385 dfid->fid, name, symtgt);
1388 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1395 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
1397 trace_9p_protocol_dump(clnt, &req->rc);
1398 goto free_and_error;
1401 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1402 qid->type, (unsigned long long)qid->path, qid->version);
1405 p9_tag_remove(clnt, req);
1409 EXPORT_SYMBOL(p9_client_symlink);
1411 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname)
1413 struct p9_client *clnt;
1414 struct p9_req_t *req;
1416 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1417 dfid->fid, oldfid->fid, newname);
1419 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1422 return PTR_ERR(req);
1424 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1425 p9_tag_remove(clnt, req);
1428 EXPORT_SYMBOL(p9_client_link);
1430 int p9_client_fsync(struct p9_fid *fid, int datasync)
1433 struct p9_client *clnt;
1434 struct p9_req_t *req;
1436 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1437 fid->fid, datasync);
1441 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1447 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1449 p9_tag_remove(clnt, req);
1454 EXPORT_SYMBOL(p9_client_fsync);
1456 int p9_client_clunk(struct p9_fid *fid)
1459 struct p9_client *clnt;
1460 struct p9_req_t *req;
1464 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1465 __func__, task_pid_nr(current));
1471 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1476 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1482 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1484 p9_tag_remove(clnt, req);
1487 * Fid is not valid even after a failed clunk
1488 * If interrupted, retry once then give up and
1489 * leak fid until umount.
1491 if (err == -ERESTARTSYS) {
1495 p9_fid_destroy(fid);
1498 EXPORT_SYMBOL(p9_client_clunk);
1500 int p9_client_remove(struct p9_fid *fid)
1503 struct p9_client *clnt;
1504 struct p9_req_t *req;
1506 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1510 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1516 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1518 p9_tag_remove(clnt, req);
1520 if (err == -ERESTARTSYS)
1521 p9_client_clunk(fid);
1523 p9_fid_destroy(fid);
1526 EXPORT_SYMBOL(p9_client_remove);
1528 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1531 struct p9_req_t *req;
1532 struct p9_client *clnt;
1534 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1535 dfid->fid, name, flags);
1538 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1543 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1545 p9_tag_remove(clnt, req);
1549 EXPORT_SYMBOL(p9_client_unlinkat);
1552 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
1557 while (iov_iter_count(to)) {
1560 count = p9_client_read_once(fid, offset, to, err);
1568 EXPORT_SYMBOL(p9_client_read);
1571 p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to,
1574 struct p9_client *clnt = fid->clnt;
1575 struct p9_req_t *req;
1576 int count = iov_iter_count(to);
1577 int rsize, non_zc = 0;
1581 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1582 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to));
1584 rsize = fid->iounit;
1585 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ)
1586 rsize = clnt->msize - P9_IOHDRSZ;
1591 /* Don't bother zerocopy for small IO (< 1024) */
1592 if (clnt->trans_mod->zc_request && rsize > 1024) {
1593 /* response header len is 11
1594 * PDU Header(7) + IO Size (4)
1596 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize,
1597 0, 11, "dqd", fid->fid,
1601 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1605 *err = PTR_ERR(req);
1609 *err = p9pdu_readf(&req->rc, clnt->proto_version,
1610 "D", &count, &dataptr);
1612 trace_9p_protocol_dump(clnt, &req->rc);
1613 p9_tag_remove(clnt, req);
1616 if (rsize < count) {
1617 pr_err("bogus RREAD count (%d > %d)\n", count, rsize);
1621 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1624 int n = copy_to_iter(dataptr, count, to);
1628 p9_tag_remove(clnt, req);
1632 iov_iter_advance(to, count);
1634 p9_tag_remove(clnt, req);
1637 EXPORT_SYMBOL(p9_client_read_once);
1640 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
1642 struct p9_client *clnt = fid->clnt;
1643 struct p9_req_t *req;
1647 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n",
1648 fid->fid, (unsigned long long) offset,
1649 iov_iter_count(from));
1651 while (iov_iter_count(from)) {
1652 int count = iov_iter_count(from);
1653 int rsize = fid->iounit;
1654 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1655 rsize = clnt->msize - P9_IOHDRSZ;
1660 /* Don't bother zerocopy for small IO (< 1024) */
1661 if (clnt->trans_mod->zc_request && rsize > 1024) {
1662 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
1663 rsize, P9_ZC_HDR_SZ, "dqd",
1664 fid->fid, offset, rsize);
1666 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
1667 offset, rsize, from);
1670 *err = PTR_ERR(req);
1674 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &count);
1676 trace_9p_protocol_dump(clnt, &req->rc);
1677 p9_tag_remove(clnt, req);
1680 if (rsize < count) {
1681 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize);
1685 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1687 p9_tag_remove(clnt, req);
1688 iov_iter_advance(from, count);
1694 EXPORT_SYMBOL(p9_client_write);
1696 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1699 struct p9_client *clnt;
1700 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1701 struct p9_req_t *req;
1704 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1707 return ERR_PTR(-ENOMEM);
1712 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1718 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret);
1720 trace_9p_protocol_dump(clnt, &req->rc);
1721 p9_tag_remove(clnt, req);
1725 p9_debug(P9_DEBUG_9P,
1726 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1727 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1728 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1729 "<<< uid=%d gid=%d n_muid=%d\n",
1730 ret->size, ret->type, ret->dev, ret->qid.type,
1731 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1732 ret->atime, ret->mtime, (unsigned long long)ret->length,
1733 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1734 from_kuid(&init_user_ns, ret->n_uid),
1735 from_kgid(&init_user_ns, ret->n_gid),
1736 from_kuid(&init_user_ns, ret->n_muid));
1738 p9_tag_remove(clnt, req);
1743 return ERR_PTR(err);
1745 EXPORT_SYMBOL(p9_client_stat);
1747 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1751 struct p9_client *clnt;
1752 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1754 struct p9_req_t *req;
1756 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1757 fid->fid, request_mask);
1760 return ERR_PTR(-ENOMEM);
1765 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1771 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret);
1773 trace_9p_protocol_dump(clnt, &req->rc);
1774 p9_tag_remove(clnt, req);
1778 p9_debug(P9_DEBUG_9P,
1779 "<<< RGETATTR st_result_mask=%lld\n"
1780 "<<< qid=%x.%llx.%x\n"
1781 "<<< st_mode=%8.8x st_nlink=%llu\n"
1782 "<<< st_uid=%d st_gid=%d\n"
1783 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1784 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1785 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1786 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1787 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1788 "<<< st_gen=%lld st_data_version=%lld\n",
1789 ret->st_result_mask, ret->qid.type, ret->qid.path,
1790 ret->qid.version, ret->st_mode, ret->st_nlink,
1791 from_kuid(&init_user_ns, ret->st_uid),
1792 from_kgid(&init_user_ns, ret->st_gid),
1793 ret->st_rdev, ret->st_size, ret->st_blksize,
1794 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1795 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1796 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1797 ret->st_gen, ret->st_data_version);
1799 p9_tag_remove(clnt, req);
1804 return ERR_PTR(err);
1806 EXPORT_SYMBOL(p9_client_getattr_dotl);
1808 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1812 /* NOTE: size shouldn't include its own length */
1813 /* size[2] type[2] dev[4] qid[13] */
1814 /* mode[4] atime[4] mtime[4] length[8]*/
1815 /* name[s] uid[s] gid[s] muid[s] */
1816 ret = 2+4+13+4+4+4+8+2+2+2+2;
1819 ret += strlen(wst->name);
1821 ret += strlen(wst->uid);
1823 ret += strlen(wst->gid);
1825 ret += strlen(wst->muid);
1827 if ((proto_version == p9_proto_2000u) ||
1828 (proto_version == p9_proto_2000L)) {
1829 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[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", fid->fid);
1847 p9_debug(P9_DEBUG_9P,
1848 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1849 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1850 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1851 " uid=%d gid=%d n_muid=%d\n",
1852 wst->size, wst->type, wst->dev, wst->qid.type,
1853 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1854 wst->atime, wst->mtime, (unsigned long long)wst->length,
1855 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1856 from_kuid(&init_user_ns, wst->n_uid),
1857 from_kgid(&init_user_ns, wst->n_gid),
1858 from_kuid(&init_user_ns, wst->n_muid));
1860 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1866 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1868 p9_tag_remove(clnt, req);
1872 EXPORT_SYMBOL(p9_client_wstat);
1874 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1877 struct p9_req_t *req;
1878 struct p9_client *clnt;
1882 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1883 p9_debug(P9_DEBUG_9P,
1884 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1885 " atime_sec=%lld atime_nsec=%lld\n"
1886 " mtime_sec=%lld mtime_nsec=%lld\n",
1887 p9attr->valid, p9attr->mode,
1888 from_kuid(&init_user_ns, p9attr->uid),
1889 from_kgid(&init_user_ns, p9attr->gid),
1890 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1891 p9attr->mtime_sec, p9attr->mtime_nsec);
1893 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1899 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1900 p9_tag_remove(clnt, req);
1904 EXPORT_SYMBOL(p9_client_setattr);
1906 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1909 struct p9_req_t *req;
1910 struct p9_client *clnt;
1915 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1917 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1923 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1924 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1925 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1927 trace_9p_protocol_dump(clnt, &req->rc);
1928 p9_tag_remove(clnt, req);
1932 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1933 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1934 "fsid %llu namelen %ld\n",
1935 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1936 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1937 sb->fsid, (long int)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, ">>> TRENAMEAT olddirfid %d old name %s"
1984 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1985 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);
2004 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
2006 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
2007 const char *attr_name, u64 *attr_size)
2010 struct p9_req_t *req;
2011 struct p9_client *clnt;
2012 struct p9_fid *attr_fid;
2015 clnt = file_fid->clnt;
2016 attr_fid = p9_fid_create(clnt);
2021 p9_debug(P9_DEBUG_9P,
2022 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2023 file_fid->fid, attr_fid->fid, attr_name);
2025 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2026 file_fid->fid, attr_fid->fid, attr_name);
2031 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size);
2033 trace_9p_protocol_dump(clnt, &req->rc);
2034 p9_tag_remove(clnt, req);
2037 p9_tag_remove(clnt, req);
2038 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2039 attr_fid->fid, *attr_size);
2042 p9_client_clunk(attr_fid);
2045 if (attr_fid && (attr_fid != file_fid))
2046 p9_fid_destroy(attr_fid);
2048 return ERR_PTR(err);
2050 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2052 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2053 u64 attr_size, int flags)
2056 struct p9_req_t *req;
2057 struct p9_client *clnt;
2059 p9_debug(P9_DEBUG_9P,
2060 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2061 fid->fid, name, (long long)attr_size, flags);
2064 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2065 fid->fid, name, attr_size, flags);
2070 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2071 p9_tag_remove(clnt, req);
2075 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2077 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2079 int err, rsize, non_zc = 0;
2080 struct p9_client *clnt;
2081 struct p9_req_t *req;
2083 struct kvec kv = {.iov_base = data, .iov_len = count};
2086 iov_iter_kvec(&to, READ, &kv, 1, count);
2088 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2089 fid->fid, (unsigned long long) offset, count);
2094 rsize = fid->iounit;
2095 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2096 rsize = clnt->msize - P9_READDIRHDRSZ;
2101 /* Don't bother zerocopy for small IO (< 1024) */
2102 if (clnt->trans_mod->zc_request && rsize > 1024) {
2104 * response header len is 11
2105 * PDU Header(7) + IO Size (4)
2107 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0,
2108 11, "dqd", fid->fid, offset, rsize);
2111 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2119 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr);
2121 trace_9p_protocol_dump(clnt, &req->rc);
2122 goto free_and_error;
2124 if (rsize < count) {
2125 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize);
2129 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2132 memmove(data, dataptr, count);
2134 p9_tag_remove(clnt, req);
2138 p9_tag_remove(clnt, req);
2142 EXPORT_SYMBOL(p9_client_readdir);
2144 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode,
2145 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2148 struct p9_client *clnt;
2149 struct p9_req_t *req;
2153 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2154 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2155 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2156 MAJOR(rdev), MINOR(rdev), gid);
2158 return PTR_ERR(req);
2160 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
2162 trace_9p_protocol_dump(clnt, &req->rc);
2165 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2166 (unsigned long long)qid->path, qid->version);
2169 p9_tag_remove(clnt, req);
2173 EXPORT_SYMBOL(p9_client_mknod_dotl);
2175 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode,
2176 kgid_t gid, struct p9_qid *qid)
2179 struct p9_client *clnt;
2180 struct p9_req_t *req;
2184 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2185 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2186 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
2189 return PTR_ERR(req);
2191 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
2193 trace_9p_protocol_dump(clnt, &req->rc);
2196 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2197 (unsigned long long)qid->path, qid->version);
2200 p9_tag_remove(clnt, req);
2204 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2206 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2209 struct p9_client *clnt;
2210 struct p9_req_t *req;
2214 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2215 "start %lld length %lld proc_id %d client_id %s\n",
2216 fid->fid, flock->type, flock->flags, flock->start,
2217 flock->length, flock->proc_id, flock->client_id);
2219 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2220 flock->flags, flock->start, flock->length,
2221 flock->proc_id, flock->client_id);
2224 return PTR_ERR(req);
2226 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status);
2228 trace_9p_protocol_dump(clnt, &req->rc);
2231 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2233 p9_tag_remove(clnt, req);
2237 EXPORT_SYMBOL(p9_client_lock_dotl);
2239 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2242 struct p9_client *clnt;
2243 struct p9_req_t *req;
2247 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2248 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2249 glock->start, glock->length, glock->proc_id, glock->client_id);
2251 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2252 glock->start, glock->length, glock->proc_id, glock->client_id);
2255 return PTR_ERR(req);
2257 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type,
2258 &glock->start, &glock->length, &glock->proc_id,
2261 trace_9p_protocol_dump(clnt, &req->rc);
2264 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2265 "proc_id %d client_id %s\n", glock->type, glock->start,
2266 glock->length, glock->proc_id, glock->client_id);
2268 p9_tag_remove(clnt, req);
2271 EXPORT_SYMBOL(p9_client_getlock_dotl);
2273 int p9_client_readlink(struct p9_fid *fid, char **target)
2276 struct p9_client *clnt;
2277 struct p9_req_t *req;
2281 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2283 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2285 return PTR_ERR(req);
2287 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target);
2289 trace_9p_protocol_dump(clnt, &req->rc);
2292 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2294 p9_tag_remove(clnt, req);
2297 EXPORT_SYMBOL(p9_client_readlink);
2299 int __init p9_client_init(void)
2301 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU);
2302 return p9_req_cache ? 0 : -ENOMEM;
2305 void __exit p9_client_exit(void)
2307 kmem_cache_destroy(p9_req_cache);