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
417 * @status: request status, one of REQ_STATUS_*
420 void p9_client_cb(struct p9_client
*c
, struct p9_req_t
*req
, int status
)
422 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
, int16_t *tag
,
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",
512 * dump the response from server
513 * This should be after check errors which poplulate pdu_fcall.
515 trace_9p_protocol_dump(c
, &req
->rc
);
517 p9_debug(P9_DEBUG_ERROR
, "couldn't parse header %d\n", err
);
520 if (type
!= P9_RERROR
&& type
!= P9_RLERROR
)
523 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
);
544 p9_debug(P9_DEBUG_9P
, "<<< RLERROR (%d)\n", -ecode
);
550 p9_debug(P9_DEBUG_ERROR
, "couldn't parse error%d\n", err
);
556 * p9_check_zc_errors - check 9p packet for error return and process it
557 * @c: current client instance
558 * @req: request to parse and check for error conditions
559 * @uidata: external buffer containing error
560 * @in_hdrlen: Size of response protocol buffer.
562 * returns error code if one is discovered, otherwise returns 0
564 * this will have to be more complicated if we have multiple
568 static int p9_check_zc_errors(struct p9_client
*c
, struct p9_req_t
*req
,
569 struct iov_iter
*uidata
, int in_hdrlen
)
576 err
= p9_parse_header(&req
->rc
, NULL
, &type
, NULL
, 0);
578 * dump the response from server
579 * This should be after parse_header which poplulate pdu_fcall.
581 trace_9p_protocol_dump(c
, &req
->rc
);
583 p9_debug(P9_DEBUG_ERROR
, "couldn't parse header %d\n", err
);
587 if (type
!= P9_RERROR
&& type
!= P9_RLERROR
)
590 if (!p9_is_proto_dotl(c
)) {
591 /* Error is reported in string format */
593 /* 7 = header size for RERROR; */
594 int inline_len
= in_hdrlen
- 7;
596 len
= req
->rc
.size
- req
->rc
.offset
;
597 if (len
> (P9_ZC_HDR_SZ
- 7)) {
602 ename
= &req
->rc
.sdata
[req
->rc
.offset
];
603 if (len
> inline_len
) {
604 /* We have error in external buffer */
605 if (!copy_from_iter_full(ename
+ inline_len
,
606 len
- inline_len
, uidata
)) {
612 err
= p9pdu_readf(&req
->rc
, c
->proto_version
, "s?d",
617 if (p9_is_proto_dotu(c
) && ecode
< 512)
621 err
= p9_errstr2errno(ename
, strlen(ename
));
623 p9_debug(P9_DEBUG_9P
, "<<< RERROR (%d) %s\n",
628 err
= p9pdu_readf(&req
->rc
, c
->proto_version
, "d", &ecode
);
631 p9_debug(P9_DEBUG_9P
, "<<< RLERROR (%d)\n", -ecode
);
636 p9_debug(P9_DEBUG_ERROR
, "couldn't parse error%d\n", err
);
640 static struct p9_req_t
*
641 p9_client_rpc(struct p9_client
*c
, int8_t type
, const char *fmt
, ...);
644 * p9_client_flush - flush (cancel) a request
646 * @oldreq: request to cancel
648 * This sents a flush for a particular request and links
649 * the flush request to the original request. The current
650 * code only supports a single flush request although the protocol
651 * allows for multiple flush requests to be sent for a single request.
655 static int p9_client_flush(struct p9_client
*c
, struct p9_req_t
*oldreq
)
657 struct p9_req_t
*req
;
661 err
= p9_parse_header(&oldreq
->tc
, NULL
, NULL
, &oldtag
, 1);
665 p9_debug(P9_DEBUG_9P
, ">>> TFLUSH tag %d\n", oldtag
);
667 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
);
749 err
= c
->trans_mod
->request(c
, req
);
751 /* write won't happen */
753 if (err
!= -ERESTARTSYS
&& err
!= -EFAULT
)
754 c
->status
= Disconnected
;
755 goto recalc_sigpending
;
758 /* Wait for the response */
759 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
)
768 && (type
== P9_TFLUSH
)) {
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
;
834 * We allocate a inline protocol data of only 4k bytes.
835 * The actual content is passed in zero-copy fashion.
837 req
= p9_client_prepare_req(c
, type
, P9_ZC_HDR_SZ
, fmt
, ap
);
842 if (signal_pending(current
)) {
844 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
= kmalloc(sizeof(struct p9_fid
), GFP_KERNEL
);
900 memset(&fid
->qid
, 0, sizeof(struct p9_qid
));
902 fid
->uid
= current_fsuid();
906 refcount_set(&fid
->count
, 1);
908 idr_preload(GFP_KERNEL
);
909 spin_lock_irq(&clnt
->lock
);
910 ret
= idr_alloc_u32(&clnt
->fids
, fid
, &fid
->fid
, P9_NOFID
- 1,
912 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
);
1192 req
= p9_client_rpc(clnt
, P9_TWALK
, "ddT", oldfid
->fid
, fid
->fid
,
1199 err
= p9pdu_readf(&req
->rc
, clnt
->proto_version
, "R", &nwqids
, &wqids
);
1201 trace_9p_protocol_dump(clnt
, &req
->rc
);
1202 p9_tag_remove(clnt
, req
);
1205 p9_tag_remove(clnt
, req
);
1207 p9_debug(P9_DEBUG_9P
, "<<< RWALK nwqid %d:\n", nwqids
);
1209 if (nwqids
!= nwname
) {
1214 for (count
= 0; count
< nwqids
; count
++)
1215 p9_debug(P9_DEBUG_9P
, "<<< [%d] %x.%llx.%x\n",
1216 count
, wqids
[count
].type
,
1217 (unsigned long long)wqids
[count
].path
,
1218 wqids
[count
].version
);
1221 memmove(&fid
->qid
, &wqids
[nwqids
- 1], sizeof(struct p9_qid
));
1223 memmove(&fid
->qid
, &oldfid
->qid
, sizeof(struct p9_qid
));
1230 p9_client_clunk(fid
);
1234 if (fid
&& (fid
!= oldfid
))
1235 p9_fid_destroy(fid
);
1237 return ERR_PTR(err
);
1239 EXPORT_SYMBOL(p9_client_walk
);
1241 int p9_client_open(struct p9_fid
*fid
, int mode
)
1244 struct p9_client
*clnt
;
1245 struct p9_req_t
*req
;
1250 p9_debug(P9_DEBUG_9P
, ">>> %s fid %d mode %d\n",
1251 p9_is_proto_dotl(clnt
) ? "TLOPEN" : "TOPEN", fid
->fid
, mode
);
1254 if (fid
->mode
!= -1)
1257 if (p9_is_proto_dotl(clnt
))
1258 req
= p9_client_rpc(clnt
, P9_TLOPEN
, "dd", fid
->fid
, mode
);
1260 req
= p9_client_rpc(clnt
, P9_TOPEN
, "db", fid
->fid
, mode
);
1266 err
= p9pdu_readf(&req
->rc
, clnt
->proto_version
, "Qd", &qid
, &iounit
);
1268 trace_9p_protocol_dump(clnt
, &req
->rc
);
1269 goto free_and_error
;
1272 p9_debug(P9_DEBUG_9P
, "<<< %s qid %x.%llx.%x iounit %x\n",
1273 p9_is_proto_dotl(clnt
) ? "RLOPEN" : "ROPEN", qid
.type
,
1274 (unsigned long long)qid
.path
, qid
.version
, iounit
);
1276 memmove(&fid
->qid
, &qid
, sizeof(struct p9_qid
));
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
);
1322 memmove(&ofid
->qid
, qid
, sizeof(struct p9_qid
));
1324 ofid
->iounit
= iounit
;
1327 p9_tag_remove(clnt
, req
);
1331 EXPORT_SYMBOL(p9_client_create_dotl
);
1333 int p9_client_fcreate(struct p9_fid
*fid
, const char *name
, u32 perm
, int mode
,
1337 struct p9_client
*clnt
;
1338 struct p9_req_t
*req
;
1342 p9_debug(P9_DEBUG_9P
, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1343 fid
->fid
, name
, perm
, mode
);
1347 if (fid
->mode
!= -1)
1350 req
= p9_client_rpc(clnt
, P9_TCREATE
, "dsdb?s", fid
->fid
, name
, perm
,
1357 err
= p9pdu_readf(&req
->rc
, clnt
->proto_version
, "Qd", &qid
, &iounit
);
1359 trace_9p_protocol_dump(clnt
, &req
->rc
);
1360 goto free_and_error
;
1363 p9_debug(P9_DEBUG_9P
, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1365 (unsigned long long)qid
.path
,
1366 qid
.version
, iounit
);
1368 memmove(&fid
->qid
, &qid
, sizeof(struct p9_qid
));
1370 fid
->iounit
= iounit
;
1373 p9_tag_remove(clnt
, req
);
1377 EXPORT_SYMBOL(p9_client_fcreate
);
1379 int p9_client_symlink(struct p9_fid
*dfid
, const char *name
,
1380 const char *symtgt
, kgid_t gid
, struct p9_qid
*qid
)
1383 struct p9_client
*clnt
;
1384 struct p9_req_t
*req
;
1386 p9_debug(P9_DEBUG_9P
, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1387 dfid
->fid
, name
, symtgt
);
1390 req
= p9_client_rpc(clnt
, P9_TSYMLINK
, "dssg", dfid
->fid
, name
, symtgt
,
1397 err
= p9pdu_readf(&req
->rc
, clnt
->proto_version
, "Q", qid
);
1399 trace_9p_protocol_dump(clnt
, &req
->rc
);
1400 goto free_and_error
;
1403 p9_debug(P9_DEBUG_9P
, "<<< RSYMLINK qid %x.%llx.%x\n",
1404 qid
->type
, (unsigned long long)qid
->path
, qid
->version
);
1407 p9_tag_remove(clnt
, req
);
1411 EXPORT_SYMBOL(p9_client_symlink
);
1413 int p9_client_link(struct p9_fid
*dfid
, struct p9_fid
*oldfid
, const char *newname
)
1415 struct p9_client
*clnt
;
1416 struct p9_req_t
*req
;
1418 p9_debug(P9_DEBUG_9P
, ">>> TLINK dfid %d oldfid %d newname %s\n",
1419 dfid
->fid
, oldfid
->fid
, newname
);
1421 req
= p9_client_rpc(clnt
, P9_TLINK
, "dds", dfid
->fid
, oldfid
->fid
,
1424 return PTR_ERR(req
);
1426 p9_debug(P9_DEBUG_9P
, "<<< RLINK\n");
1427 p9_tag_remove(clnt
, req
);
1430 EXPORT_SYMBOL(p9_client_link
);
1432 int p9_client_fsync(struct p9_fid
*fid
, int datasync
)
1435 struct p9_client
*clnt
;
1436 struct p9_req_t
*req
;
1438 p9_debug(P9_DEBUG_9P
, ">>> TFSYNC fid %d datasync:%d\n",
1439 fid
->fid
, datasync
);
1443 req
= p9_client_rpc(clnt
, P9_TFSYNC
, "dd", fid
->fid
, datasync
);
1449 p9_debug(P9_DEBUG_9P
, "<<< RFSYNC fid %d\n", fid
->fid
);
1451 p9_tag_remove(clnt
, req
);
1456 EXPORT_SYMBOL(p9_client_fsync
);
1458 int p9_client_clunk(struct p9_fid
*fid
)
1461 struct p9_client
*clnt
;
1462 struct p9_req_t
*req
;
1465 if (!fid
|| IS_ERR(fid
)) {
1466 pr_warn("%s (%d): Trying to clunk with invalid fid\n",
1467 __func__
, task_pid_nr(current
));
1471 if (!refcount_dec_and_test(&fid
->count
))
1475 p9_debug(P9_DEBUG_9P
, ">>> TCLUNK fid %d (try %d)\n", fid
->fid
,
1480 req
= p9_client_rpc(clnt
, P9_TCLUNK
, "d", fid
->fid
);
1486 p9_debug(P9_DEBUG_9P
, "<<< RCLUNK fid %d\n", fid
->fid
);
1488 p9_tag_remove(clnt
, req
);
1491 * Fid is not valid even after a failed clunk
1492 * If interrupted, retry once then give up and
1493 * leak fid until umount.
1495 if (err
== -ERESTARTSYS
) {
1499 p9_fid_destroy(fid
);
1502 EXPORT_SYMBOL(p9_client_clunk
);
1504 int p9_client_remove(struct p9_fid
*fid
)
1507 struct p9_client
*clnt
;
1508 struct p9_req_t
*req
;
1510 p9_debug(P9_DEBUG_9P
, ">>> TREMOVE fid %d\n", fid
->fid
);
1514 req
= p9_client_rpc(clnt
, P9_TREMOVE
, "d", fid
->fid
);
1520 p9_debug(P9_DEBUG_9P
, "<<< RREMOVE fid %d\n", fid
->fid
);
1522 p9_tag_remove(clnt
, req
);
1524 if (err
== -ERESTARTSYS
)
1525 p9_client_clunk(fid
);
1527 p9_fid_destroy(fid
);
1530 EXPORT_SYMBOL(p9_client_remove
);
1532 int p9_client_unlinkat(struct p9_fid
*dfid
, const char *name
, int flags
)
1535 struct p9_req_t
*req
;
1536 struct p9_client
*clnt
;
1538 p9_debug(P9_DEBUG_9P
, ">>> TUNLINKAT fid %d %s %d\n",
1539 dfid
->fid
, name
, flags
);
1542 req
= p9_client_rpc(clnt
, P9_TUNLINKAT
, "dsd", dfid
->fid
, name
, flags
);
1547 p9_debug(P9_DEBUG_9P
, "<<< RUNLINKAT fid %d %s\n", dfid
->fid
, name
);
1549 p9_tag_remove(clnt
, req
);
1553 EXPORT_SYMBOL(p9_client_unlinkat
);
1556 p9_client_read(struct p9_fid
*fid
, u64 offset
, struct iov_iter
*to
, int *err
)
1561 while (iov_iter_count(to
)) {
1564 count
= p9_client_read_once(fid
, offset
, to
, err
);
1572 EXPORT_SYMBOL(p9_client_read
);
1575 p9_client_read_once(struct p9_fid
*fid
, u64 offset
, struct iov_iter
*to
,
1578 struct p9_client
*clnt
= fid
->clnt
;
1579 struct p9_req_t
*req
;
1580 int count
= iov_iter_count(to
);
1581 int rsize
, non_zc
= 0;
1585 p9_debug(P9_DEBUG_9P
, ">>> TREAD fid %d offset %llu %d\n",
1586 fid
->fid
, (unsigned long long) offset
, (int)iov_iter_count(to
));
1588 rsize
= fid
->iounit
;
1589 if (!rsize
|| rsize
> clnt
->msize
- P9_IOHDRSZ
)
1590 rsize
= clnt
->msize
- P9_IOHDRSZ
;
1595 /* Don't bother zerocopy for small IO (< 1024) */
1596 if (clnt
->trans_mod
->zc_request
&& rsize
> 1024) {
1597 /* response header len is 11
1598 * PDU Header(7) + IO Size (4)
1600 req
= p9_client_zc_rpc(clnt
, P9_TREAD
, to
, NULL
, rsize
,
1601 0, 11, "dqd", fid
->fid
,
1605 req
= p9_client_rpc(clnt
, P9_TREAD
, "dqd", fid
->fid
, offset
,
1609 *err
= PTR_ERR(req
);
1613 *err
= p9pdu_readf(&req
->rc
, clnt
->proto_version
,
1614 "D", &count
, &dataptr
);
1616 trace_9p_protocol_dump(clnt
, &req
->rc
);
1617 p9_tag_remove(clnt
, req
);
1620 if (rsize
< count
) {
1621 pr_err("bogus RREAD count (%d > %d)\n", count
, rsize
);
1625 p9_debug(P9_DEBUG_9P
, "<<< RREAD count %d\n", count
);
1627 p9_tag_remove(clnt
, req
);
1632 int n
= copy_to_iter(dataptr
, count
, to
);
1636 p9_tag_remove(clnt
, req
);
1640 iov_iter_advance(to
, count
);
1642 p9_tag_remove(clnt
, req
);
1645 EXPORT_SYMBOL(p9_client_read_once
);
1648 p9_client_write(struct p9_fid
*fid
, u64 offset
, struct iov_iter
*from
, int *err
)
1650 struct p9_client
*clnt
= fid
->clnt
;
1651 struct p9_req_t
*req
;
1655 p9_debug(P9_DEBUG_9P
, ">>> TWRITE fid %d offset %llu count %zd\n",
1656 fid
->fid
, (unsigned long long) offset
,
1657 iov_iter_count(from
));
1659 while (iov_iter_count(from
)) {
1660 int count
= iov_iter_count(from
);
1661 int rsize
= fid
->iounit
;
1662 if (!rsize
|| rsize
> clnt
->msize
-P9_IOHDRSZ
)
1663 rsize
= clnt
->msize
- P9_IOHDRSZ
;
1668 /* Don't bother zerocopy for small IO (< 1024) */
1669 if (clnt
->trans_mod
->zc_request
&& rsize
> 1024) {
1670 req
= p9_client_zc_rpc(clnt
, P9_TWRITE
, NULL
, from
, 0,
1671 rsize
, P9_ZC_HDR_SZ
, "dqd",
1672 fid
->fid
, offset
, rsize
);
1674 req
= p9_client_rpc(clnt
, P9_TWRITE
, "dqV", fid
->fid
,
1675 offset
, rsize
, from
);
1678 *err
= PTR_ERR(req
);
1682 *err
= p9pdu_readf(&req
->rc
, clnt
->proto_version
, "d", &count
);
1684 trace_9p_protocol_dump(clnt
, &req
->rc
);
1685 p9_tag_remove(clnt
, req
);
1688 if (rsize
< count
) {
1689 pr_err("bogus RWRITE count (%d > %d)\n", count
, rsize
);
1693 p9_debug(P9_DEBUG_9P
, "<<< RWRITE count %d\n", count
);
1695 p9_tag_remove(clnt
, req
);
1696 iov_iter_advance(from
, count
);
1702 EXPORT_SYMBOL(p9_client_write
);
1704 struct p9_wstat
*p9_client_stat(struct p9_fid
*fid
)
1707 struct p9_client
*clnt
;
1708 struct p9_wstat
*ret
= kmalloc(sizeof(struct p9_wstat
), GFP_KERNEL
);
1709 struct p9_req_t
*req
;
1712 p9_debug(P9_DEBUG_9P
, ">>> TSTAT fid %d\n", fid
->fid
);
1715 return ERR_PTR(-ENOMEM
);
1720 req
= p9_client_rpc(clnt
, P9_TSTAT
, "d", fid
->fid
);
1726 err
= p9pdu_readf(&req
->rc
, clnt
->proto_version
, "wS", &ignored
, ret
);
1728 trace_9p_protocol_dump(clnt
, &req
->rc
);
1729 p9_tag_remove(clnt
, req
);
1733 p9_debug(P9_DEBUG_9P
,
1734 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1735 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1736 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1737 "<<< uid=%d gid=%d n_muid=%d\n",
1738 ret
->size
, ret
->type
, ret
->dev
, ret
->qid
.type
,
1739 (unsigned long long)ret
->qid
.path
, ret
->qid
.version
, ret
->mode
,
1740 ret
->atime
, ret
->mtime
, (unsigned long long)ret
->length
,
1741 ret
->name
, ret
->uid
, ret
->gid
, ret
->muid
, ret
->extension
,
1742 from_kuid(&init_user_ns
, ret
->n_uid
),
1743 from_kgid(&init_user_ns
, ret
->n_gid
),
1744 from_kuid(&init_user_ns
, ret
->n_muid
));
1746 p9_tag_remove(clnt
, req
);
1751 return ERR_PTR(err
);
1753 EXPORT_SYMBOL(p9_client_stat
);
1755 struct p9_stat_dotl
*p9_client_getattr_dotl(struct p9_fid
*fid
,
1759 struct p9_client
*clnt
;
1760 struct p9_stat_dotl
*ret
= kmalloc(sizeof(struct p9_stat_dotl
),
1762 struct p9_req_t
*req
;
1764 p9_debug(P9_DEBUG_9P
, ">>> TGETATTR fid %d, request_mask %lld\n",
1765 fid
->fid
, request_mask
);
1768 return ERR_PTR(-ENOMEM
);
1773 req
= p9_client_rpc(clnt
, P9_TGETATTR
, "dq", fid
->fid
, request_mask
);
1779 err
= p9pdu_readf(&req
->rc
, clnt
->proto_version
, "A", ret
);
1781 trace_9p_protocol_dump(clnt
, &req
->rc
);
1782 p9_tag_remove(clnt
, req
);
1786 p9_debug(P9_DEBUG_9P
,
1787 "<<< RGETATTR st_result_mask=%lld\n"
1788 "<<< qid=%x.%llx.%x\n"
1789 "<<< st_mode=%8.8x st_nlink=%llu\n"
1790 "<<< st_uid=%d st_gid=%d\n"
1791 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1792 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1793 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1794 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1795 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1796 "<<< st_gen=%lld st_data_version=%lld\n",
1797 ret
->st_result_mask
, ret
->qid
.type
, ret
->qid
.path
,
1798 ret
->qid
.version
, ret
->st_mode
, ret
->st_nlink
,
1799 from_kuid(&init_user_ns
, ret
->st_uid
),
1800 from_kgid(&init_user_ns
, ret
->st_gid
),
1801 ret
->st_rdev
, ret
->st_size
, ret
->st_blksize
,
1802 ret
->st_blocks
, ret
->st_atime_sec
, ret
->st_atime_nsec
,
1803 ret
->st_mtime_sec
, ret
->st_mtime_nsec
, ret
->st_ctime_sec
,
1804 ret
->st_ctime_nsec
, ret
->st_btime_sec
, ret
->st_btime_nsec
,
1805 ret
->st_gen
, ret
->st_data_version
);
1807 p9_tag_remove(clnt
, req
);
1812 return ERR_PTR(err
);
1814 EXPORT_SYMBOL(p9_client_getattr_dotl
);
1816 static int p9_client_statsize(struct p9_wstat
*wst
, int proto_version
)
1820 /* NOTE: size shouldn't include its own length */
1821 /* size[2] type[2] dev[4] qid[13] */
1822 /* mode[4] atime[4] mtime[4] length[8]*/
1823 /* name[s] uid[s] gid[s] muid[s] */
1824 ret
= 2+4+13+4+4+4+8+2+2+2+2;
1827 ret
+= strlen(wst
->name
);
1829 ret
+= strlen(wst
->uid
);
1831 ret
+= strlen(wst
->gid
);
1833 ret
+= strlen(wst
->muid
);
1835 if ((proto_version
== p9_proto_2000u
) ||
1836 (proto_version
== p9_proto_2000L
)) {
1837 ret
+= 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1839 ret
+= strlen(wst
->extension
);
1845 int p9_client_wstat(struct p9_fid
*fid
, struct p9_wstat
*wst
)
1848 struct p9_req_t
*req
;
1849 struct p9_client
*clnt
;
1853 wst
->size
= p9_client_statsize(wst
, clnt
->proto_version
);
1854 p9_debug(P9_DEBUG_9P
, ">>> TWSTAT fid %d\n", fid
->fid
);
1855 p9_debug(P9_DEBUG_9P
,
1856 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1857 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1858 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1859 " uid=%d gid=%d n_muid=%d\n",
1860 wst
->size
, wst
->type
, wst
->dev
, wst
->qid
.type
,
1861 (unsigned long long)wst
->qid
.path
, wst
->qid
.version
, wst
->mode
,
1862 wst
->atime
, wst
->mtime
, (unsigned long long)wst
->length
,
1863 wst
->name
, wst
->uid
, wst
->gid
, wst
->muid
, wst
->extension
,
1864 from_kuid(&init_user_ns
, wst
->n_uid
),
1865 from_kgid(&init_user_ns
, wst
->n_gid
),
1866 from_kuid(&init_user_ns
, wst
->n_muid
));
1868 req
= p9_client_rpc(clnt
, P9_TWSTAT
, "dwS", fid
->fid
, wst
->size
+2, wst
);
1874 p9_debug(P9_DEBUG_9P
, "<<< RWSTAT fid %d\n", fid
->fid
);
1876 p9_tag_remove(clnt
, req
);
1880 EXPORT_SYMBOL(p9_client_wstat
);
1882 int p9_client_setattr(struct p9_fid
*fid
, struct p9_iattr_dotl
*p9attr
)
1885 struct p9_req_t
*req
;
1886 struct p9_client
*clnt
;
1890 p9_debug(P9_DEBUG_9P
, ">>> TSETATTR fid %d\n", fid
->fid
);
1891 p9_debug(P9_DEBUG_9P
,
1892 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1893 " atime_sec=%lld atime_nsec=%lld\n"
1894 " mtime_sec=%lld mtime_nsec=%lld\n",
1895 p9attr
->valid
, p9attr
->mode
,
1896 from_kuid(&init_user_ns
, p9attr
->uid
),
1897 from_kgid(&init_user_ns
, p9attr
->gid
),
1898 p9attr
->size
, p9attr
->atime_sec
, p9attr
->atime_nsec
,
1899 p9attr
->mtime_sec
, p9attr
->mtime_nsec
);
1901 req
= p9_client_rpc(clnt
, P9_TSETATTR
, "dI", fid
->fid
, p9attr
);
1907 p9_debug(P9_DEBUG_9P
, "<<< RSETATTR fid %d\n", fid
->fid
);
1908 p9_tag_remove(clnt
, req
);
1912 EXPORT_SYMBOL(p9_client_setattr
);
1914 int p9_client_statfs(struct p9_fid
*fid
, struct p9_rstatfs
*sb
)
1917 struct p9_req_t
*req
;
1918 struct p9_client
*clnt
;
1923 p9_debug(P9_DEBUG_9P
, ">>> TSTATFS fid %d\n", fid
->fid
);
1925 req
= p9_client_rpc(clnt
, P9_TSTATFS
, "d", fid
->fid
);
1931 err
= p9pdu_readf(&req
->rc
, clnt
->proto_version
, "ddqqqqqqd", &sb
->type
,
1932 &sb
->bsize
, &sb
->blocks
, &sb
->bfree
, &sb
->bavail
,
1933 &sb
->files
, &sb
->ffree
, &sb
->fsid
, &sb
->namelen
);
1935 trace_9p_protocol_dump(clnt
, &req
->rc
);
1936 p9_tag_remove(clnt
, req
);
1940 p9_debug(P9_DEBUG_9P
, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1941 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1942 "fsid %llu namelen %ld\n",
1943 fid
->fid
, (long unsigned int)sb
->type
, (long int)sb
->bsize
,
1944 sb
->blocks
, sb
->bfree
, sb
->bavail
, sb
->files
, sb
->ffree
,
1945 sb
->fsid
, (long int)sb
->namelen
);
1947 p9_tag_remove(clnt
, req
);
1951 EXPORT_SYMBOL(p9_client_statfs
);
1953 int p9_client_rename(struct p9_fid
*fid
,
1954 struct p9_fid
*newdirfid
, const char *name
)
1957 struct p9_req_t
*req
;
1958 struct p9_client
*clnt
;
1963 p9_debug(P9_DEBUG_9P
, ">>> TRENAME fid %d newdirfid %d name %s\n",
1964 fid
->fid
, newdirfid
->fid
, name
);
1966 req
= p9_client_rpc(clnt
, P9_TRENAME
, "dds", fid
->fid
,
1967 newdirfid
->fid
, name
);
1973 p9_debug(P9_DEBUG_9P
, "<<< RRENAME fid %d\n", fid
->fid
);
1975 p9_tag_remove(clnt
, req
);
1979 EXPORT_SYMBOL(p9_client_rename
);
1981 int p9_client_renameat(struct p9_fid
*olddirfid
, const char *old_name
,
1982 struct p9_fid
*newdirfid
, const char *new_name
)
1985 struct p9_req_t
*req
;
1986 struct p9_client
*clnt
;
1989 clnt
= olddirfid
->clnt
;
1991 p9_debug(P9_DEBUG_9P
, ">>> TRENAMEAT olddirfid %d old name %s"
1992 " newdirfid %d new name %s\n", olddirfid
->fid
, old_name
,
1993 newdirfid
->fid
, new_name
);
1995 req
= p9_client_rpc(clnt
, P9_TRENAMEAT
, "dsds", olddirfid
->fid
,
1996 old_name
, newdirfid
->fid
, new_name
);
2002 p9_debug(P9_DEBUG_9P
, "<<< RRENAMEAT newdirfid %d new name %s\n",
2003 newdirfid
->fid
, new_name
);
2005 p9_tag_remove(clnt
, req
);
2009 EXPORT_SYMBOL(p9_client_renameat
);
2012 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
2014 struct p9_fid
*p9_client_xattrwalk(struct p9_fid
*file_fid
,
2015 const char *attr_name
, u64
*attr_size
)
2018 struct p9_req_t
*req
;
2019 struct p9_client
*clnt
;
2020 struct p9_fid
*attr_fid
;
2023 clnt
= file_fid
->clnt
;
2024 attr_fid
= p9_fid_create(clnt
);
2029 p9_debug(P9_DEBUG_9P
,
2030 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2031 file_fid
->fid
, attr_fid
->fid
, attr_name
);
2033 req
= p9_client_rpc(clnt
, P9_TXATTRWALK
, "dds",
2034 file_fid
->fid
, attr_fid
->fid
, attr_name
);
2039 err
= p9pdu_readf(&req
->rc
, clnt
->proto_version
, "q", attr_size
);
2041 trace_9p_protocol_dump(clnt
, &req
->rc
);
2042 p9_tag_remove(clnt
, req
);
2045 p9_tag_remove(clnt
, req
);
2046 p9_debug(P9_DEBUG_9P
, "<<< RXATTRWALK fid %d size %llu\n",
2047 attr_fid
->fid
, *attr_size
);
2050 p9_client_clunk(attr_fid
);
2053 if (attr_fid
&& (attr_fid
!= file_fid
))
2054 p9_fid_destroy(attr_fid
);
2056 return ERR_PTR(err
);
2058 EXPORT_SYMBOL_GPL(p9_client_xattrwalk
);
2060 int p9_client_xattrcreate(struct p9_fid
*fid
, const char *name
,
2061 u64 attr_size
, int flags
)
2064 struct p9_req_t
*req
;
2065 struct p9_client
*clnt
;
2067 p9_debug(P9_DEBUG_9P
,
2068 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2069 fid
->fid
, name
, (long long)attr_size
, flags
);
2072 req
= p9_client_rpc(clnt
, P9_TXATTRCREATE
, "dsqd",
2073 fid
->fid
, name
, attr_size
, flags
);
2078 p9_debug(P9_DEBUG_9P
, "<<< RXATTRCREATE fid %d\n", fid
->fid
);
2079 p9_tag_remove(clnt
, req
);
2083 EXPORT_SYMBOL_GPL(p9_client_xattrcreate
);
2085 int p9_client_readdir(struct p9_fid
*fid
, char *data
, u32 count
, u64 offset
)
2087 int err
, rsize
, non_zc
= 0;
2088 struct p9_client
*clnt
;
2089 struct p9_req_t
*req
;
2091 struct kvec kv
= {.iov_base
= data
, .iov_len
= count
};
2094 iov_iter_kvec(&to
, READ
, &kv
, 1, count
);
2096 p9_debug(P9_DEBUG_9P
, ">>> TREADDIR fid %d offset %llu count %d\n",
2097 fid
->fid
, (unsigned long long) offset
, count
);
2102 rsize
= fid
->iounit
;
2103 if (!rsize
|| rsize
> clnt
->msize
-P9_READDIRHDRSZ
)
2104 rsize
= clnt
->msize
- P9_READDIRHDRSZ
;
2109 /* Don't bother zerocopy for small IO (< 1024) */
2110 if (clnt
->trans_mod
->zc_request
&& rsize
> 1024) {
2112 * response header len is 11
2113 * PDU Header(7) + IO Size (4)
2115 req
= p9_client_zc_rpc(clnt
, P9_TREADDIR
, &to
, NULL
, rsize
, 0,
2116 11, "dqd", fid
->fid
, offset
, rsize
);
2119 req
= p9_client_rpc(clnt
, P9_TREADDIR
, "dqd", fid
->fid
,
2127 err
= p9pdu_readf(&req
->rc
, clnt
->proto_version
, "D", &count
, &dataptr
);
2129 trace_9p_protocol_dump(clnt
, &req
->rc
);
2130 goto free_and_error
;
2132 if (rsize
< count
) {
2133 pr_err("bogus RREADDIR count (%d > %d)\n", count
, rsize
);
2137 p9_debug(P9_DEBUG_9P
, "<<< RREADDIR count %d\n", count
);
2140 memmove(data
, dataptr
, count
);
2142 p9_tag_remove(clnt
, req
);
2146 p9_tag_remove(clnt
, req
);
2150 EXPORT_SYMBOL(p9_client_readdir
);
2152 int p9_client_mknod_dotl(struct p9_fid
*fid
, const char *name
, int mode
,
2153 dev_t rdev
, kgid_t gid
, struct p9_qid
*qid
)
2156 struct p9_client
*clnt
;
2157 struct p9_req_t
*req
;
2161 p9_debug(P9_DEBUG_9P
, ">>> TMKNOD fid %d name %s mode %d major %d "
2162 "minor %d\n", fid
->fid
, name
, mode
, MAJOR(rdev
), MINOR(rdev
));
2163 req
= p9_client_rpc(clnt
, P9_TMKNOD
, "dsdddg", fid
->fid
, name
, mode
,
2164 MAJOR(rdev
), MINOR(rdev
), gid
);
2166 return PTR_ERR(req
);
2168 err
= p9pdu_readf(&req
->rc
, clnt
->proto_version
, "Q", qid
);
2170 trace_9p_protocol_dump(clnt
, &req
->rc
);
2173 p9_debug(P9_DEBUG_9P
, "<<< RMKNOD qid %x.%llx.%x\n", qid
->type
,
2174 (unsigned long long)qid
->path
, qid
->version
);
2177 p9_tag_remove(clnt
, req
);
2181 EXPORT_SYMBOL(p9_client_mknod_dotl
);
2183 int p9_client_mkdir_dotl(struct p9_fid
*fid
, const char *name
, int mode
,
2184 kgid_t gid
, struct p9_qid
*qid
)
2187 struct p9_client
*clnt
;
2188 struct p9_req_t
*req
;
2192 p9_debug(P9_DEBUG_9P
, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2193 fid
->fid
, name
, mode
, from_kgid(&init_user_ns
, gid
));
2194 req
= p9_client_rpc(clnt
, P9_TMKDIR
, "dsdg", fid
->fid
, name
, mode
,
2197 return PTR_ERR(req
);
2199 err
= p9pdu_readf(&req
->rc
, clnt
->proto_version
, "Q", qid
);
2201 trace_9p_protocol_dump(clnt
, &req
->rc
);
2204 p9_debug(P9_DEBUG_9P
, "<<< RMKDIR qid %x.%llx.%x\n", qid
->type
,
2205 (unsigned long long)qid
->path
, qid
->version
);
2208 p9_tag_remove(clnt
, req
);
2212 EXPORT_SYMBOL(p9_client_mkdir_dotl
);
2214 int p9_client_lock_dotl(struct p9_fid
*fid
, struct p9_flock
*flock
, u8
*status
)
2217 struct p9_client
*clnt
;
2218 struct p9_req_t
*req
;
2222 p9_debug(P9_DEBUG_9P
, ">>> TLOCK fid %d type %i flags %d "
2223 "start %lld length %lld proc_id %d client_id %s\n",
2224 fid
->fid
, flock
->type
, flock
->flags
, flock
->start
,
2225 flock
->length
, flock
->proc_id
, flock
->client_id
);
2227 req
= p9_client_rpc(clnt
, P9_TLOCK
, "dbdqqds", fid
->fid
, flock
->type
,
2228 flock
->flags
, flock
->start
, flock
->length
,
2229 flock
->proc_id
, flock
->client_id
);
2232 return PTR_ERR(req
);
2234 err
= p9pdu_readf(&req
->rc
, clnt
->proto_version
, "b", status
);
2236 trace_9p_protocol_dump(clnt
, &req
->rc
);
2239 p9_debug(P9_DEBUG_9P
, "<<< RLOCK status %i\n", *status
);
2241 p9_tag_remove(clnt
, req
);
2245 EXPORT_SYMBOL(p9_client_lock_dotl
);
2247 int p9_client_getlock_dotl(struct p9_fid
*fid
, struct p9_getlock
*glock
)
2250 struct p9_client
*clnt
;
2251 struct p9_req_t
*req
;
2255 p9_debug(P9_DEBUG_9P
, ">>> TGETLOCK fid %d, type %i start %lld "
2256 "length %lld proc_id %d client_id %s\n", fid
->fid
, glock
->type
,
2257 glock
->start
, glock
->length
, glock
->proc_id
, glock
->client_id
);
2259 req
= p9_client_rpc(clnt
, P9_TGETLOCK
, "dbqqds", fid
->fid
, glock
->type
,
2260 glock
->start
, glock
->length
, glock
->proc_id
, glock
->client_id
);
2263 return PTR_ERR(req
);
2265 err
= p9pdu_readf(&req
->rc
, clnt
->proto_version
, "bqqds", &glock
->type
,
2266 &glock
->start
, &glock
->length
, &glock
->proc_id
,
2269 trace_9p_protocol_dump(clnt
, &req
->rc
);
2272 p9_debug(P9_DEBUG_9P
, "<<< RGETLOCK type %i start %lld length %lld "
2273 "proc_id %d client_id %s\n", glock
->type
, glock
->start
,
2274 glock
->length
, glock
->proc_id
, glock
->client_id
);
2276 p9_tag_remove(clnt
, req
);
2279 EXPORT_SYMBOL(p9_client_getlock_dotl
);
2281 int p9_client_readlink(struct p9_fid
*fid
, char **target
)
2284 struct p9_client
*clnt
;
2285 struct p9_req_t
*req
;
2289 p9_debug(P9_DEBUG_9P
, ">>> TREADLINK fid %d\n", fid
->fid
);
2291 req
= p9_client_rpc(clnt
, P9_TREADLINK
, "d", fid
->fid
);
2293 return PTR_ERR(req
);
2295 err
= p9pdu_readf(&req
->rc
, clnt
->proto_version
, "s", target
);
2297 trace_9p_protocol_dump(clnt
, &req
->rc
);
2300 p9_debug(P9_DEBUG_9P
, "<<< RREADLINK target %s\n", *target
);
2302 p9_tag_remove(clnt
, req
);
2305 EXPORT_SYMBOL(p9_client_readlink
);
2307 int __init
p9_client_init(void)
2309 p9_req_cache
= KMEM_CACHE(p9_req_t
, SLAB_TYPESAFE_BY_RCU
);
2310 return p9_req_cache
? 0 : -ENOMEM
;
2313 void __exit
p9_client_exit(void)
2315 kmem_cache_destroy(p9_req_cache
);