Commit | Line | Data |
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1f327613 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
bd238fb4 | 2 | /* |
bd238fb4 LI |
3 | * 9P Client |
4 | * | |
8a0dc95f | 5 | * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com> |
bd238fb4 | 6 | * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net> |
bd238fb4 LI |
7 | */ |
8 | ||
5d385153 JP |
9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
10 | ||
bd238fb4 LI |
11 | #include <linux/module.h> |
12 | #include <linux/errno.h> | |
13 | #include <linux/fs.h> | |
8a0dc95f | 14 | #include <linux/poll.h> |
bd238fb4 LI |
15 | #include <linux/idr.h> |
16 | #include <linux/mutex.h> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
3f07c014 | 18 | #include <linux/sched/signal.h> |
bd238fb4 | 19 | #include <linux/uaccess.h> |
4f3b35c1 | 20 | #include <linux/uio.h> |
bd238fb4 | 21 | #include <net/9p/9p.h> |
fb0466c3 | 22 | #include <linux/parser.h> |
c4fac910 | 23 | #include <linux/seq_file.h> |
bd238fb4 | 24 | #include <net/9p/client.h> |
8b81ef58 | 25 | #include <net/9p/transport.h> |
51a87c55 | 26 | #include "protocol.h" |
bd238fb4 | 27 | |
348b5901 AK |
28 | #define CREATE_TRACE_POINTS |
29 | #include <trace/events/9p.h> | |
30 | ||
2a034722 EVH |
31 | /* DEFAULT MSIZE = 32 pages worth of payload + P9_HDRSZ + |
32 | * room for write (16 extra) or read (11 extra) operands. | |
33 | */ | |
34 | ||
35 | #define DEFAULT_MSIZE ((128 * 1024) + P9_IOHDRSZ) | |
9210fc0a | 36 | |
6e195b0f DM |
37 | /* Client Option Parsing (code inspired by NFS code) |
38 | * - a little lazy - parse all client options | |
39 | */ | |
8a0dc95f EVH |
40 | |
41 | enum { | |
42 | Opt_msize, | |
43 | Opt_trans, | |
44 | Opt_legacy, | |
0fb80abd | 45 | Opt_version, |
8a0dc95f EVH |
46 | Opt_err, |
47 | }; | |
48 | ||
a447c093 | 49 | static const match_table_t tokens = { |
8a0dc95f EVH |
50 | {Opt_msize, "msize=%u"}, |
51 | {Opt_legacy, "noextend"}, | |
52 | {Opt_trans, "trans=%s"}, | |
0fb80abd | 53 | {Opt_version, "version=%s"}, |
8a0dc95f EVH |
54 | {Opt_err, NULL}, |
55 | }; | |
56 | ||
342fee1d SK |
57 | inline int p9_is_proto_dotl(struct p9_client *clnt) |
58 | { | |
a02cec21 | 59 | return clnt->proto_version == p9_proto_2000L; |
342fee1d SK |
60 | } |
61 | EXPORT_SYMBOL(p9_is_proto_dotl); | |
62 | ||
63 | inline int p9_is_proto_dotu(struct p9_client *clnt) | |
64 | { | |
a02cec21 | 65 | return clnt->proto_version == p9_proto_2000u; |
342fee1d SK |
66 | } |
67 | EXPORT_SYMBOL(p9_is_proto_dotu); | |
68 | ||
c4fac910 DH |
69 | int p9_show_client_options(struct seq_file *m, struct p9_client *clnt) |
70 | { | |
9210fc0a | 71 | if (clnt->msize != DEFAULT_MSIZE) |
c4fac910 | 72 | seq_printf(m, ",msize=%u", clnt->msize); |
61b272c3 | 73 | seq_printf(m, ",trans=%s", clnt->trans_mod->name); |
c4fac910 DH |
74 | |
75 | switch (clnt->proto_version) { | |
76 | case p9_proto_legacy: | |
77 | seq_puts(m, ",noextend"); | |
78 | break; | |
79 | case p9_proto_2000u: | |
80 | seq_puts(m, ",version=9p2000.u"); | |
81 | break; | |
82 | case p9_proto_2000L: | |
83 | /* Default */ | |
84 | break; | |
85 | } | |
86 | ||
87 | if (clnt->trans_mod->show_options) | |
88 | return clnt->trans_mod->show_options(m, clnt); | |
89 | return 0; | |
90 | } | |
91 | EXPORT_SYMBOL(p9_show_client_options); | |
92 | ||
6e195b0f | 93 | /* Some error codes are taken directly from the server replies, |
43def35c SD |
94 | * make sure they are valid. |
95 | */ | |
96 | static int safe_errno(int err) | |
97 | { | |
6e195b0f | 98 | if (err > 0 || err < -MAX_ERRNO) { |
43def35c SD |
99 | p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err); |
100 | return -EPROTO; | |
101 | } | |
102 | return err; | |
103 | } | |
104 | ||
0fb80abd | 105 | /* Interpret mount option for protocol version */ |
4d63055f | 106 | static int get_protocol_version(char *s) |
0fb80abd | 107 | { |
3dc9fef6 DC |
108 | int version = -EINVAL; |
109 | ||
4d63055f | 110 | if (!strcmp(s, "9p2000")) { |
0fb80abd | 111 | version = p9_proto_legacy; |
5d385153 | 112 | p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n"); |
4d63055f | 113 | } else if (!strcmp(s, "9p2000.u")) { |
0fb80abd | 114 | version = p9_proto_2000u; |
5d385153 | 115 | p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n"); |
4d63055f | 116 | } else if (!strcmp(s, "9p2000.L")) { |
45bc21ed | 117 | version = p9_proto_2000L; |
5d385153 | 118 | p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n"); |
6e195b0f | 119 | } else { |
5d385153 | 120 | pr_info("Unknown protocol version %s\n", s); |
6e195b0f | 121 | } |
4d63055f | 122 | |
0fb80abd SK |
123 | return version; |
124 | } | |
125 | ||
8a0dc95f | 126 | /** |
03ff7371 | 127 | * parse_opts - parse mount options into client structure |
0e15597e AK |
128 | * @opts: options string passed from mount |
129 | * @clnt: existing v9fs client information | |
8a0dc95f | 130 | * |
bb8ffdfc | 131 | * Return 0 upon success, -ERRNO upon failure |
8a0dc95f EVH |
132 | */ |
133 | ||
bb8ffdfc | 134 | static int parse_opts(char *opts, struct p9_client *clnt) |
8a0dc95f | 135 | { |
d8c8a9e3 | 136 | char *options, *tmp_options; |
8a0dc95f EVH |
137 | char *p; |
138 | substring_t args[MAX_OPT_ARGS]; | |
139 | int option; | |
4d63055f | 140 | char *s; |
bb8ffdfc | 141 | int ret = 0; |
8a0dc95f | 142 | |
095e7999 | 143 | clnt->proto_version = p9_proto_2000L; |
9210fc0a | 144 | clnt->msize = DEFAULT_MSIZE; |
8a0dc95f | 145 | |
bb8ffdfc EVH |
146 | if (!opts) |
147 | return 0; | |
148 | ||
d8c8a9e3 | 149 | tmp_options = kstrdup(opts, GFP_KERNEL); |
6e195b0f | 150 | if (!tmp_options) |
bb8ffdfc | 151 | return -ENOMEM; |
d8c8a9e3 | 152 | options = tmp_options; |
8a0dc95f EVH |
153 | |
154 | while ((p = strsep(&options, ",")) != NULL) { | |
4d5077f1 | 155 | int token, r; |
6e195b0f | 156 | |
8a0dc95f EVH |
157 | if (!*p) |
158 | continue; | |
159 | token = match_token(p, tokens, args); | |
4d5077f1 AK |
160 | switch (token) { |
161 | case Opt_msize: | |
162 | r = match_int(&args[0], &option); | |
bb8ffdfc | 163 | if (r < 0) { |
5d385153 JP |
164 | p9_debug(P9_DEBUG_ERROR, |
165 | "integer field, but no integer?\n"); | |
bb8ffdfc | 166 | ret = r; |
8a0dc95f EVH |
167 | continue; |
168 | } | |
574d356b DM |
169 | if (option < 4096) { |
170 | p9_debug(P9_DEBUG_ERROR, | |
171 | "msize should be at least 4k\n"); | |
172 | ret = -EINVAL; | |
173 | continue; | |
174 | } | |
8a0dc95f EVH |
175 | clnt->msize = option; |
176 | break; | |
177 | case Opt_trans: | |
4d63055f PK |
178 | s = match_strdup(&args[0]); |
179 | if (!s) { | |
180 | ret = -ENOMEM; | |
5d385153 JP |
181 | p9_debug(P9_DEBUG_ERROR, |
182 | "problem allocating copy of trans arg\n"); | |
4d63055f | 183 | goto free_and_return; |
9421c3e6 CX |
184 | } |
185 | ||
186 | v9fs_put_trans(clnt->trans_mod); | |
4d63055f | 187 | clnt->trans_mod = v9fs_get_trans_by_name(s); |
6e195b0f | 188 | if (!clnt->trans_mod) { |
5d385153 JP |
189 | pr_info("Could not find request transport: %s\n", |
190 | s); | |
349d3bb8 | 191 | ret = -EINVAL; |
349d3bb8 | 192 | } |
4d63055f | 193 | kfree(s); |
8a0dc95f EVH |
194 | break; |
195 | case Opt_legacy: | |
342fee1d | 196 | clnt->proto_version = p9_proto_legacy; |
8a0dc95f | 197 | break; |
0fb80abd | 198 | case Opt_version: |
4d63055f PK |
199 | s = match_strdup(&args[0]); |
200 | if (!s) { | |
201 | ret = -ENOMEM; | |
5d385153 JP |
202 | p9_debug(P9_DEBUG_ERROR, |
203 | "problem allocating copy of version arg\n"); | |
0fb80abd | 204 | goto free_and_return; |
4d63055f | 205 | } |
8d856c72 CX |
206 | r = get_protocol_version(s); |
207 | if (r < 0) | |
208 | ret = r; | |
209 | else | |
210 | clnt->proto_version = r; | |
4d63055f | 211 | kfree(s); |
0fb80abd | 212 | break; |
8a0dc95f EVH |
213 | default: |
214 | continue; | |
215 | } | |
216 | } | |
72029fe8 | 217 | |
349d3bb8 | 218 | free_and_return: |
c290fba8 | 219 | if (ret) |
220 | v9fs_put_trans(clnt->trans_mod); | |
d8c8a9e3 | 221 | kfree(tmp_options); |
bb8ffdfc | 222 | return ret; |
8a0dc95f EVH |
223 | } |
224 | ||
91a76be3 DM |
225 | static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc, |
226 | int alloc_msize) | |
5387320d | 227 | { |
91a76be3 DM |
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; | |
231 | } else { | |
232 | fc->sdata = kmalloc(alloc_msize, GFP_NOFS); | |
233 | fc->cache = NULL; | |
234 | } | |
523adb6c DM |
235 | if (!fc->sdata) |
236 | return -ENOMEM; | |
5387320d | 237 | fc->capacity = alloc_msize; |
523adb6c DM |
238 | return 0; |
239 | } | |
240 | ||
241 | void p9_fcall_fini(struct p9_fcall *fc) | |
242 | { | |
91a76be3 DM |
243 | /* sdata can be NULL for interrupted requests in trans_rdma, |
244 | * and kmem_cache_free does not do NULL-check for us | |
245 | */ | |
246 | if (unlikely(!fc->sdata)) | |
247 | return; | |
248 | ||
249 | if (fc->cache) | |
250 | kmem_cache_free(fc->cache, fc->sdata); | |
251 | else | |
252 | kfree(fc->sdata); | |
5387320d | 253 | } |
523adb6c | 254 | EXPORT_SYMBOL(p9_fcall_fini); |
5387320d | 255 | |
996d5b4d MW |
256 | static struct kmem_cache *p9_req_cache; |
257 | ||
fea511a6 | 258 | /** |
03ff7371 | 259 | * p9_tag_alloc - Allocate a new request. |
996d5b4d MW |
260 | * @c: Client session. |
261 | * @type: Transaction type. | |
60ece083 CS |
262 | * @t_size: Buffer size for holding this request |
263 | * (automatic calculation by format template if 0). | |
264 | * @r_size: Buffer size for holding server's reply on this request | |
265 | * (automatic calculation by format template if 0). | |
266 | * @fmt: Format template for assembling 9p request message | |
267 | * (see p9pdu_vwritef). | |
268 | * @ap: Variable arguments to be fed to passed format template | |
269 | * (see p9pdu_vwritef). | |
fea511a6 | 270 | * |
996d5b4d MW |
271 | * Context: Process context. |
272 | * Return: Pointer to new request. | |
fea511a6 | 273 | */ |
ef6b0807 | 274 | static struct p9_req_t * |
60ece083 CS |
275 | p9_tag_alloc(struct p9_client *c, int8_t type, uint t_size, uint r_size, |
276 | const char *fmt, va_list ap) | |
fea511a6 | 277 | { |
996d5b4d | 278 | struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS); |
60ece083 CS |
279 | int alloc_tsize; |
280 | int alloc_rsize; | |
996d5b4d | 281 | int tag; |
60ece083 CS |
282 | va_list apc; |
283 | ||
284 | va_copy(apc, ap); | |
285 | alloc_tsize = min_t(size_t, c->msize, | |
286 | t_size ?: p9_msg_buf_size(c, type, fmt, apc)); | |
287 | va_end(apc); | |
288 | ||
289 | alloc_rsize = min_t(size_t, c->msize, | |
290 | r_size ?: p9_msg_buf_size(c, type + 1, fmt, ap)); | |
fea511a6 | 291 | |
996d5b4d | 292 | if (!req) |
72ea0321 | 293 | return ERR_PTR(-ENOMEM); |
fea511a6 | 294 | |
e7c62197 | 295 | if (p9_fcall_init(c, &req->tc, alloc_tsize)) |
523adb6c | 296 | goto free_req; |
e7c62197 | 297 | if (p9_fcall_init(c, &req->rc, alloc_rsize)) |
996d5b4d | 298 | goto free; |
51a87c55 | 299 | |
523adb6c DM |
300 | p9pdu_reset(&req->tc); |
301 | p9pdu_reset(&req->rc); | |
0ce772fe | 302 | req->t_err = 0; |
51a87c55 | 303 | req->status = REQ_STATUS_ALLOC; |
26273ade SS |
304 | /* refcount needs to be set to 0 before inserting into the idr |
305 | * so p9_tag_lookup does not accept a request that is not fully | |
306 | * initialized. refcount_set to 2 below will mark request ready. | |
307 | */ | |
308 | refcount_set(&req->refcount, 0); | |
996d5b4d MW |
309 | init_waitqueue_head(&req->wq); |
310 | INIT_LIST_HEAD(&req->req_list); | |
311 | ||
312 | idr_preload(GFP_NOFS); | |
313 | spin_lock_irq(&c->lock); | |
314 | if (type == P9_TVERSION) | |
315 | tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1, | |
316 | GFP_NOWAIT); | |
317 | else | |
318 | tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT); | |
523adb6c | 319 | req->tc.tag = tag; |
996d5b4d MW |
320 | spin_unlock_irq(&c->lock); |
321 | idr_preload_end(); | |
322 | if (tag < 0) | |
323 | goto free; | |
fea511a6 | 324 | |
728356de TB |
325 | /* Init ref to two because in the general case there is one ref |
326 | * that is put asynchronously by a writer thread, one ref | |
327 | * temporarily given by p9_tag_lookup and put by p9_client_cb | |
67dd8e44 | 328 | * in the recv thread, and one ref put by p9_req_put in the |
728356de TB |
329 | * main thread. The only exception is virtio that does not use |
330 | * p9_tag_lookup but does not have a writer thread either | |
331 | * (the write happens synchronously in the request/zc_request | |
332 | * callback), so p9_client_cb eats the second ref there | |
333 | * as the pointer is duplicated directly by virtqueue_add_sgs() | |
334 | */ | |
6cda1286 | 335 | refcount_set(&req->refcount, 2); |
728356de | 336 | |
ea071aa1 SD |
337 | return req; |
338 | ||
996d5b4d | 339 | free: |
523adb6c DM |
340 | p9_fcall_fini(&req->tc); |
341 | p9_fcall_fini(&req->rc); | |
342 | free_req: | |
996d5b4d | 343 | kmem_cache_free(p9_req_cache, req); |
ea071aa1 | 344 | return ERR_PTR(-ENOMEM); |
fea511a6 | 345 | } |
fea511a6 EVH |
346 | |
347 | /** | |
996d5b4d MW |
348 | * p9_tag_lookup - Look up a request by tag. |
349 | * @c: Client session. | |
350 | * @tag: Transaction ID. | |
fea511a6 | 351 | * |
996d5b4d MW |
352 | * Context: Any context. |
353 | * Return: A request, or %NULL if there is no request with that tag. | |
fea511a6 | 354 | */ |
fea511a6 EVH |
355 | struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) |
356 | { | |
996d5b4d | 357 | struct p9_req_t *req; |
fea511a6 | 358 | |
996d5b4d | 359 | rcu_read_lock(); |
728356de | 360 | again: |
996d5b4d | 361 | req = idr_find(&c->reqs, tag); |
728356de TB |
362 | if (req) { |
363 | /* We have to be careful with the req found under rcu_read_lock | |
364 | * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the | |
365 | * ref again without corrupting other data, then check again | |
366 | * that the tag matches once we have the ref | |
367 | */ | |
368 | if (!p9_req_try_get(req)) | |
369 | goto again; | |
370 | if (req->tc.tag != tag) { | |
8b11ff09 | 371 | p9_req_put(c, req); |
728356de TB |
372 | goto again; |
373 | } | |
374 | } | |
996d5b4d | 375 | rcu_read_unlock(); |
fea511a6 | 376 | |
996d5b4d | 377 | return req; |
fea511a6 EVH |
378 | } |
379 | EXPORT_SYMBOL(p9_tag_lookup); | |
380 | ||
381 | /** | |
43cbcbee | 382 | * p9_tag_remove - Remove a tag. |
996d5b4d | 383 | * @c: Client session. |
43cbcbee | 384 | * @r: Request of reference. |
fea511a6 | 385 | * |
996d5b4d | 386 | * Context: Any context. |
fea511a6 | 387 | */ |
67dd8e44 | 388 | static void p9_tag_remove(struct p9_client *c, struct p9_req_t *r) |
fea511a6 | 389 | { |
996d5b4d | 390 | unsigned long flags; |
523adb6c | 391 | u16 tag = r->tc.tag; |
fea511a6 | 392 | |
67dd8e44 | 393 | p9_debug(P9_DEBUG_MUX, "freeing clnt %p req %p tag: %d\n", c, r, tag); |
996d5b4d MW |
394 | spin_lock_irqsave(&c->lock, flags); |
395 | idr_remove(&c->reqs, tag); | |
396 | spin_unlock_irqrestore(&c->lock, flags); | |
728356de TB |
397 | } |
398 | ||
8b11ff09 | 399 | int p9_req_put(struct p9_client *c, struct p9_req_t *r) |
728356de | 400 | { |
6cda1286 | 401 | if (refcount_dec_and_test(&r->refcount)) { |
67dd8e44 | 402 | p9_tag_remove(c, r); |
6e195b0f | 403 | |
6cda1286 KO |
404 | p9_fcall_fini(&r->tc); |
405 | p9_fcall_fini(&r->rc); | |
406 | kmem_cache_free(p9_req_cache, r); | |
407 | return 1; | |
408 | } | |
409 | return 0; | |
728356de TB |
410 | } |
411 | EXPORT_SYMBOL(p9_req_put); | |
412 | ||
fea511a6 EVH |
413 | /** |
414 | * p9_tag_cleanup - cleans up tags structure and reclaims resources | |
0e15597e | 415 | * @c: v9fs client struct |
fea511a6 EVH |
416 | * |
417 | * This frees resources associated with the tags structure | |
418 | * | |
419 | */ | |
420 | static void p9_tag_cleanup(struct p9_client *c) | |
421 | { | |
996d5b4d MW |
422 | struct p9_req_t *req; |
423 | int id; | |
fea511a6 | 424 | |
996d5b4d MW |
425 | rcu_read_lock(); |
426 | idr_for_each_entry(&c->reqs, req, id) { | |
427 | pr_info("Tag %d still in use\n", id); | |
67dd8e44 | 428 | if (p9_req_put(c, req) == 0) |
728356de TB |
429 | pr_warn("Packet with tag %d has still references", |
430 | req->tc.tag); | |
fea511a6 | 431 | } |
996d5b4d | 432 | rcu_read_unlock(); |
673d62cd EVH |
433 | } |
434 | ||
91b8534f EVH |
435 | /** |
436 | * p9_client_cb - call back from transport to client | |
760b3d61 AL |
437 | * @c: client state |
438 | * @req: request received | |
439 | * @status: request status, one of REQ_STATUS_* | |
91b8534f EVH |
440 | * |
441 | */ | |
2b6e72ed | 442 | void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) |
91b8534f | 443 | { |
523adb6c | 444 | p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag); |
2b6e72ed | 445 | |
6e195b0f | 446 | /* This barrier is needed to make sure any change made to req before |
2d58f63f | 447 | * the status change is visible to another thread |
2b6e72ed DM |
448 | */ |
449 | smp_wmb(); | |
1a4f69ef | 450 | WRITE_ONCE(req->status, status); |
2b6e72ed | 451 | |
2557d0c5 | 452 | wake_up(&req->wq); |
523adb6c | 453 | p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag); |
8b11ff09 | 454 | p9_req_put(c, req); |
91b8534f EVH |
455 | } |
456 | EXPORT_SYMBOL(p9_client_cb); | |
457 | ||
51a87c55 EVH |
458 | /** |
459 | * p9_parse_header - parse header arguments out of a packet | |
460 | * @pdu: packet to parse | |
461 | * @size: size of packet | |
462 | * @type: type of request | |
463 | * @tag: tag of packet | |
464 | * @rewind: set if we need to rewind offset afterwards | |
465 | */ | |
466 | ||
467 | int | |
6e195b0f DM |
468 | p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, |
469 | int16_t *tag, int rewind) | |
51a87c55 | 470 | { |
6e195b0f DM |
471 | s8 r_type; |
472 | s16 r_tag; | |
473 | s32 r_size; | |
51a87c55 EVH |
474 | int offset = pdu->offset; |
475 | int err; | |
476 | ||
477 | pdu->offset = 0; | |
51a87c55 EVH |
478 | |
479 | err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); | |
480 | if (err) | |
481 | goto rewind_and_exit; | |
482 | ||
51a87c55 EVH |
483 | if (type) |
484 | *type = r_type; | |
485 | if (tag) | |
486 | *tag = r_tag; | |
487 | if (size) | |
488 | *size = r_size; | |
489 | ||
f984579a TB |
490 | if (pdu->size != r_size || r_size < 7) { |
491 | err = -EINVAL; | |
492 | goto rewind_and_exit; | |
493 | } | |
494 | ||
495 | pdu->id = r_type; | |
496 | pdu->tag = r_tag; | |
497 | ||
498 | p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", | |
499 | pdu->size, pdu->id, pdu->tag); | |
51a87c55 EVH |
500 | |
501 | rewind_and_exit: | |
502 | if (rewind) | |
503 | pdu->offset = offset; | |
504 | return err; | |
505 | } | |
506 | EXPORT_SYMBOL(p9_parse_header); | |
507 | ||
508 | /** | |
509 | * p9_check_errors - check 9p packet for error return and process it | |
510 | * @c: current client instance | |
511 | * @req: request to parse and check for error conditions | |
512 | * | |
513 | * returns error code if one is discovered, otherwise returns 0 | |
514 | * | |
515 | * this will have to be more complicated if we have multiple | |
516 | * error packet types | |
517 | */ | |
518 | ||
519 | static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) | |
520 | { | |
6e195b0f | 521 | s8 type; |
51a87c55 | 522 | int err; |
ca41bb3e | 523 | int ecode; |
51a87c55 | 524 | |
523adb6c | 525 | err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); |
a31b3cff CS |
526 | if (req->rc.size > req->rc.capacity && !req->rc.zc) { |
527 | pr_err("requested packet size too big: %d does not fit %zu (type=%d)\n", | |
528 | req->rc.size, req->rc.capacity, req->rc.id); | |
f984579a TB |
529 | return -EIO; |
530 | } | |
6e195b0f | 531 | /* dump the response from server |
348b5901 AK |
532 | * This should be after check errors which poplulate pdu_fcall. |
533 | */ | |
523adb6c | 534 | trace_9p_protocol_dump(c, &req->rc); |
51a87c55 | 535 | if (err) { |
5d385153 | 536 | p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); |
51a87c55 EVH |
537 | return err; |
538 | } | |
ca41bb3e VJJ |
539 | if (type != P9_RERROR && type != P9_RLERROR) |
540 | return 0; | |
4f7ebe80 | 541 | |
ca41bb3e VJJ |
542 | if (!p9_is_proto_dotl(c)) { |
543 | char *ename; | |
6e195b0f | 544 | |
523adb6c | 545 | err = p9pdu_readf(&req->rc, c->proto_version, "s?d", |
abfa034e | 546 | &ename, &ecode); |
ca41bb3e VJJ |
547 | if (err) |
548 | goto out_err; | |
4f7ebe80 | 549 | |
287980e4 | 550 | if (p9_is_proto_dotu(c) && ecode < 512) |
ca41bb3e | 551 | err = -ecode; |
4f7ebe80 | 552 | |
287980e4 | 553 | if (!err) { |
ca41bb3e | 554 | err = p9_errstr2errno(ename, strlen(ename)); |
4f7ebe80 | 555 | |
5d385153 JP |
556 | p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", |
557 | -ecode, ename); | |
4f7ebe80 | 558 | } |
abfa034e | 559 | kfree(ename); |
ca41bb3e | 560 | } else { |
523adb6c | 561 | err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); |
27eb4c31 DM |
562 | if (err) |
563 | goto out_err; | |
ca41bb3e VJJ |
564 | err = -ecode; |
565 | ||
5d385153 | 566 | p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); |
ca41bb3e | 567 | } |
51a87c55 | 568 | |
51a87c55 | 569 | return err; |
4f7ebe80 AB |
570 | |
571 | out_err: | |
5d385153 | 572 | p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); |
4f7ebe80 AB |
573 | |
574 | return err; | |
51a87c55 EVH |
575 | } |
576 | ||
aca00763 RL |
577 | static struct p9_req_t * |
578 | p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); | |
579 | ||
51a87c55 EVH |
580 | /** |
581 | * p9_client_flush - flush (cancel) a request | |
0e15597e AK |
582 | * @c: client state |
583 | * @oldreq: request to cancel | |
51a87c55 | 584 | * |
aca00763 | 585 | * This sents a flush for a particular request and links |
51a87c55 EVH |
586 | * the flush request to the original request. The current |
587 | * code only supports a single flush request although the protocol | |
588 | * allows for multiple flush requests to be sent for a single request. | |
589 | * | |
590 | */ | |
591 | ||
592 | static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) | |
593 | { | |
594 | struct p9_req_t *req; | |
6e195b0f | 595 | s16 oldtag; |
51a87c55 EVH |
596 | int err; |
597 | ||
523adb6c | 598 | err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1); |
51a87c55 EVH |
599 | if (err) |
600 | return err; | |
601 | ||
5d385153 | 602 | p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); |
51a87c55 EVH |
603 | |
604 | req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); | |
605 | if (IS_ERR(req)) | |
606 | return PTR_ERR(req); | |
607 | ||
6e195b0f | 608 | /* if we haven't received a response for oldreq, |
60ff779c | 609 | * remove it from the list |
1cff3306 | 610 | */ |
1a4f69ef | 611 | if (READ_ONCE(oldreq->status) == REQ_STATUS_SENT) { |
afd8d654 SD |
612 | if (c->trans_mod->cancelled) |
613 | c->trans_mod->cancelled(c, oldreq); | |
728356de | 614 | } |
1bab88b2 | 615 | |
67dd8e44 | 616 | p9_req_put(c, req); |
51a87c55 EVH |
617 | return 0; |
618 | } | |
619 | ||
abfa034e | 620 | static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, |
e7c62197 | 621 | int8_t type, uint t_size, uint r_size, |
abfa034e | 622 | const char *fmt, va_list ap) |
91b8534f | 623 | { |
996d5b4d | 624 | int err; |
91b8534f | 625 | struct p9_req_t *req; |
60ece083 | 626 | va_list apc; |
91b8534f | 627 | |
5d385153 | 628 | p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); |
91b8534f | 629 | |
6d96d3ab AK |
630 | /* we allow for any status other than disconnected */ |
631 | if (c->status == Disconnected) | |
632 | return ERR_PTR(-EIO); | |
633 | ||
634 | /* if status is begin_disconnected we allow only clunk request */ | |
6e195b0f | 635 | if (c->status == BeginDisconnect && type != P9_TCLUNK) |
51a87c55 | 636 | return ERR_PTR(-EIO); |
91b8534f | 637 | |
60ece083 CS |
638 | va_copy(apc, ap); |
639 | req = p9_tag_alloc(c, type, t_size, r_size, fmt, apc); | |
640 | va_end(apc); | |
51a87c55 EVH |
641 | if (IS_ERR(req)) |
642 | return req; | |
91b8534f | 643 | |
51a87c55 | 644 | /* marshall the data */ |
523adb6c DM |
645 | p9pdu_prepare(&req->tc, req->tc.tag, type); |
646 | err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap); | |
7b3bb3fe AK |
647 | if (err) |
648 | goto reterr; | |
523adb6c DM |
649 | p9pdu_finalize(c, &req->tc); |
650 | trace_9p_client_req(c, type, req->tc.tag); | |
abfa034e AK |
651 | return req; |
652 | reterr: | |
67dd8e44 | 653 | p9_req_put(c, req); |
728356de | 654 | /* We have to put also the 2nd reference as it won't be used */ |
8b11ff09 | 655 | p9_req_put(c, req); |
abfa034e AK |
656 | return ERR_PTR(err); |
657 | } | |
658 | ||
659 | /** | |
660 | * p9_client_rpc - issue a request and wait for a response | |
661 | * @c: client session | |
662 | * @type: type of request | |
663 | * @fmt: protocol format string (see protocol.c) | |
664 | * | |
67dd8e44 | 665 | * Returns request structure (which client must free using p9_req_put) |
abfa034e AK |
666 | */ |
667 | ||
668 | static struct p9_req_t * | |
669 | p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) | |
670 | { | |
671 | va_list ap; | |
672 | int sigpending, err; | |
673 | unsigned long flags; | |
674 | struct p9_req_t *req; | |
60ece083 CS |
675 | /* Passing zero for tsize/rsize to p9_client_prepare_req() tells it to |
676 | * auto determine an appropriate (small) request/response size | |
677 | * according to actual message data being sent. Currently RDMA | |
678 | * transport is excluded from this response message size optimization, | |
679 | * as it would not cope with it, due to its pooled response buffers | |
680 | * (using an optimized request size for RDMA as well though). | |
681 | */ | |
682 | const uint tsize = 0; | |
683 | const uint rsize = c->trans_mod->pooled_rbuffers ? c->msize : 0; | |
abfa034e AK |
684 | |
685 | va_start(ap, fmt); | |
60ece083 | 686 | req = p9_client_prepare_req(c, type, tsize, rsize, fmt, ap); |
abfa034e AK |
687 | va_end(ap); |
688 | if (IS_ERR(req)) | |
689 | return req; | |
690 | ||
8e4c2eee CS |
691 | req->tc.zc = false; |
692 | req->rc.zc = false; | |
693 | ||
abfa034e AK |
694 | if (signal_pending(current)) { |
695 | sigpending = 1; | |
696 | clear_thread_flag(TIF_SIGPENDING); | |
6e195b0f | 697 | } else { |
abfa034e | 698 | sigpending = 0; |
6e195b0f | 699 | } |
91b8534f EVH |
700 | |
701 | err = c->trans_mod->request(c, req); | |
702 | if (err < 0) { | |
728356de | 703 | /* write won't happen */ |
8b11ff09 | 704 | p9_req_put(c, req); |
3cd79678 | 705 | if (err != -ERESTARTSYS && err != -EFAULT) |
52f44e0d | 706 | c->status = Disconnected; |
a8522243 | 707 | goto recalc_sigpending; |
91b8534f | 708 | } |
a314f274 | 709 | again: |
abfa034e | 710 | /* Wait for the response */ |
1a4f69ef DM |
711 | err = wait_event_killable(req->wq, |
712 | READ_ONCE(req->status) >= REQ_STATUS_RCVD); | |
91b8534f | 713 | |
6e195b0f | 714 | /* Make sure our req is coherent with regard to updates in other |
2b6e72ed DM |
715 | * threads - echoes to wmb() in the callback |
716 | */ | |
717 | smp_rmb(); | |
718 | ||
6e195b0f DM |
719 | if (err == -ERESTARTSYS && c->status == Connected && |
720 | type == P9_TFLUSH) { | |
a314f274 JG |
721 | sigpending = 1; |
722 | clear_thread_flag(TIF_SIGPENDING); | |
723 | goto again; | |
724 | } | |
725 | ||
1a4f69ef | 726 | if (READ_ONCE(req->status) == REQ_STATUS_ERROR) { |
5d385153 | 727 | p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); |
91b8534f | 728 | err = req->t_err; |
91b8534f | 729 | } |
6e195b0f | 730 | if (err == -ERESTARTSYS && c->status == Connected) { |
5d385153 | 731 | p9_debug(P9_DEBUG_MUX, "flushing\n"); |
91b8534f | 732 | sigpending = 1; |
91b8534f EVH |
733 | clear_thread_flag(TIF_SIGPENDING); |
734 | ||
1bab88b2 LI |
735 | if (c->trans_mod->cancel(c, req)) |
736 | p9_client_flush(c, req); | |
737 | ||
738 | /* if we received the response anyway, don't signal error */ | |
1a4f69ef | 739 | if (READ_ONCE(req->status) == REQ_STATUS_RCVD) |
1bab88b2 | 740 | err = 0; |
91b8534f | 741 | } |
a8522243 | 742 | recalc_sigpending: |
91b8534f EVH |
743 | if (sigpending) { |
744 | spin_lock_irqsave(¤t->sighand->siglock, flags); | |
745 | recalc_sigpending(); | |
746 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); | |
747 | } | |
91b8534f EVH |
748 | if (err < 0) |
749 | goto reterr; | |
750 | ||
51a87c55 | 751 | err = p9_check_errors(c, req); |
523adb6c | 752 | trace_9p_client_res(c, type, req->rc.tag, err); |
348b5901 | 753 | if (!err) |
51a87c55 | 754 | return req; |
abfa034e | 755 | reterr: |
67dd8e44 | 756 | p9_req_put(c, req); |
43def35c | 757 | return ERR_PTR(safe_errno(err)); |
abfa034e AK |
758 | } |
759 | ||
760 | /** | |
761 | * p9_client_zc_rpc - issue a request and wait for a response | |
762 | * @c: client session | |
763 | * @type: type of request | |
4f3b35c1 AV |
764 | * @uidata: destination for zero copy read |
765 | * @uodata: source for zero copy write | |
abfa034e AK |
766 | * @inlen: read buffer size |
767 | * @olen: write buffer size | |
15e522a7 | 768 | * @in_hdrlen: reader header size, This is the size of response protocol data |
abfa034e AK |
769 | * @fmt: protocol format string (see protocol.c) |
770 | * | |
67dd8e44 | 771 | * Returns request structure (which client must free using p9_req_put) |
abfa034e AK |
772 | */ |
773 | static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, | |
4f3b35c1 AV |
774 | struct iov_iter *uidata, |
775 | struct iov_iter *uodata, | |
abfa034e | 776 | int inlen, int olen, int in_hdrlen, |
4f3b35c1 | 777 | const char *fmt, ...) |
abfa034e AK |
778 | { |
779 | va_list ap; | |
780 | int sigpending, err; | |
781 | unsigned long flags; | |
782 | struct p9_req_t *req; | |
783 | ||
784 | va_start(ap, fmt); | |
6e195b0f | 785 | /* We allocate a inline protocol data of only 4k bytes. |
abfa034e AK |
786 | * The actual content is passed in zero-copy fashion. |
787 | */ | |
e7c62197 | 788 | req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, P9_ZC_HDR_SZ, fmt, ap); |
abfa034e AK |
789 | va_end(ap); |
790 | if (IS_ERR(req)) | |
791 | return req; | |
792 | ||
8e4c2eee CS |
793 | req->tc.zc = true; |
794 | req->rc.zc = true; | |
795 | ||
abfa034e AK |
796 | if (signal_pending(current)) { |
797 | sigpending = 1; | |
798 | clear_thread_flag(TIF_SIGPENDING); | |
6e195b0f | 799 | } else { |
abfa034e | 800 | sigpending = 0; |
6e195b0f | 801 | } |
abfa034e | 802 | |
abfa034e | 803 | err = c->trans_mod->zc_request(c, req, uidata, uodata, |
4f3b35c1 | 804 | inlen, olen, in_hdrlen); |
abfa034e AK |
805 | if (err < 0) { |
806 | if (err == -EIO) | |
807 | c->status = Disconnected; | |
a84b69cb | 808 | if (err != -ERESTARTSYS) |
a8522243 | 809 | goto recalc_sigpending; |
abfa034e | 810 | } |
1a4f69ef | 811 | if (READ_ONCE(req->status) == REQ_STATUS_ERROR) { |
5d385153 | 812 | p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); |
abfa034e AK |
813 | err = req->t_err; |
814 | } | |
6e195b0f | 815 | if (err == -ERESTARTSYS && c->status == Connected) { |
5d385153 | 816 | p9_debug(P9_DEBUG_MUX, "flushing\n"); |
abfa034e AK |
817 | sigpending = 1; |
818 | clear_thread_flag(TIF_SIGPENDING); | |
91b8534f | 819 | |
abfa034e AK |
820 | if (c->trans_mod->cancel(c, req)) |
821 | p9_client_flush(c, req); | |
822 | ||
823 | /* if we received the response anyway, don't signal error */ | |
1a4f69ef | 824 | if (READ_ONCE(req->status) == REQ_STATUS_RCVD) |
abfa034e AK |
825 | err = 0; |
826 | } | |
a8522243 | 827 | recalc_sigpending: |
abfa034e AK |
828 | if (sigpending) { |
829 | spin_lock_irqsave(¤t->sighand->siglock, flags); | |
830 | recalc_sigpending(); | |
831 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); | |
832 | } | |
833 | if (err < 0) | |
834 | goto reterr; | |
835 | ||
f615625a | 836 | err = p9_check_errors(c, req); |
523adb6c | 837 | trace_9p_client_res(c, type, req->rc.tag, err); |
348b5901 | 838 | if (!err) |
abfa034e | 839 | return req; |
91b8534f | 840 | reterr: |
67dd8e44 | 841 | p9_req_put(c, req); |
43def35c | 842 | return ERR_PTR(safe_errno(err)); |
91b8534f EVH |
843 | } |
844 | ||
5503ac56 EVH |
845 | static struct p9_fid *p9_fid_create(struct p9_client *clnt) |
846 | { | |
9f3e9bbe | 847 | int ret; |
5503ac56 EVH |
848 | struct p9_fid *fid; |
849 | ||
5d385153 | 850 | p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); |
aa7aeee1 | 851 | fid = kzalloc(sizeof(*fid), GFP_KERNEL); |
5503ac56 | 852 | if (!fid) |
b5303be2 | 853 | return NULL; |
5503ac56 | 854 | |
5503ac56 | 855 | fid->mode = -1; |
f8b9d53a | 856 | fid->uid = current_fsuid(); |
5503ac56 | 857 | fid->clnt = clnt; |
ff5e72eb | 858 | refcount_set(&fid->count, 1); |
5503ac56 | 859 | |
f28cdf04 MW |
860 | idr_preload(GFP_KERNEL); |
861 | spin_lock_irq(&clnt->lock); | |
862 | ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1, | |
863 | GFP_NOWAIT); | |
864 | spin_unlock_irq(&clnt->lock); | |
865 | idr_preload_end(); | |
286c171b DM |
866 | if (!ret) { |
867 | trace_9p_fid_ref(fid, P9_FID_REF_CREATE); | |
f28cdf04 | 868 | return fid; |
286c171b | 869 | } |
5503ac56 | 870 | |
5503ac56 | 871 | kfree(fid); |
b5303be2 | 872 | return NULL; |
5503ac56 EVH |
873 | } |
874 | ||
875 | static void p9_fid_destroy(struct p9_fid *fid) | |
876 | { | |
877 | struct p9_client *clnt; | |
cac23d65 | 878 | unsigned long flags; |
5503ac56 | 879 | |
5d385153 | 880 | p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); |
286c171b | 881 | trace_9p_fid_ref(fid, P9_FID_REF_DESTROY); |
5503ac56 | 882 | clnt = fid->clnt; |
cac23d65 | 883 | spin_lock_irqsave(&clnt->lock, flags); |
f28cdf04 | 884 | idr_remove(&clnt->fids, fid->fid); |
cac23d65 | 885 | spin_unlock_irqrestore(&clnt->lock, flags); |
3e2796a9 | 886 | kfree(fid->rdir); |
5503ac56 EVH |
887 | kfree(fid); |
888 | } | |
8a0dc95f | 889 | |
286c171b DM |
890 | /* We also need to export tracepoint symbols for tracepoint_enabled() */ |
891 | EXPORT_TRACEPOINT_SYMBOL(9p_fid_ref); | |
892 | ||
893 | void do_trace_9p_fid_get(struct p9_fid *fid) | |
894 | { | |
895 | trace_9p_fid_ref(fid, P9_FID_REF_GET); | |
896 | } | |
897 | EXPORT_SYMBOL(do_trace_9p_fid_get); | |
898 | ||
899 | void do_trace_9p_fid_put(struct p9_fid *fid) | |
900 | { | |
901 | trace_9p_fid_ref(fid, P9_FID_REF_PUT); | |
902 | } | |
903 | EXPORT_SYMBOL(do_trace_9p_fid_put); | |
904 | ||
32a875ad | 905 | static int p9_client_version(struct p9_client *c) |
bd238fb4 | 906 | { |
6936bf60 | 907 | int err = 0; |
51a87c55 | 908 | struct p9_req_t *req; |
7913690d | 909 | char *version = NULL; |
51a87c55 | 910 | int msize; |
bd238fb4 | 911 | |
5d385153 JP |
912 | p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", |
913 | c->msize, c->proto_version); | |
c5a7697d SK |
914 | |
915 | switch (c->proto_version) { | |
45bc21ed | 916 | case p9_proto_2000L: |
c5a7697d | 917 | req = p9_client_rpc(c, P9_TVERSION, "ds", |
6e195b0f | 918 | c->msize, "9P2000.L"); |
c5a7697d SK |
919 | break; |
920 | case p9_proto_2000u: | |
921 | req = p9_client_rpc(c, P9_TVERSION, "ds", | |
6e195b0f | 922 | c->msize, "9P2000.u"); |
c5a7697d SK |
923 | break; |
924 | case p9_proto_legacy: | |
925 | req = p9_client_rpc(c, P9_TVERSION, "ds", | |
6e195b0f | 926 | c->msize, "9P2000"); |
c5a7697d SK |
927 | break; |
928 | default: | |
929 | return -EINVAL; | |
c5a7697d SK |
930 | } |
931 | ||
51a87c55 EVH |
932 | if (IS_ERR(req)) |
933 | return PTR_ERR(req); | |
6936bf60 | 934 | |
523adb6c | 935 | err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version); |
51a87c55 | 936 | if (err) { |
5d385153 | 937 | p9_debug(P9_DEBUG_9P, "version error %d\n", err); |
523adb6c | 938 | trace_9p_protocol_dump(c, &req->rc); |
6936bf60 | 939 | goto error; |
51a87c55 | 940 | } |
6936bf60 | 941 | |
5d385153 | 942 | p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); |
6e195b0f | 943 | if (!strncmp(version, "9P2000.L", 8)) { |
45bc21ed | 944 | c->proto_version = p9_proto_2000L; |
6e195b0f | 945 | } else if (!strncmp(version, "9P2000.u", 8)) { |
342fee1d | 946 | c->proto_version = p9_proto_2000u; |
6e195b0f | 947 | } else if (!strncmp(version, "9P2000", 6)) { |
342fee1d | 948 | c->proto_version = p9_proto_legacy; |
6e195b0f | 949 | } else { |
574d356b DM |
950 | p9_debug(P9_DEBUG_ERROR, |
951 | "server returned an unknown version: %s\n", version); | |
6936bf60 EVH |
952 | err = -EREMOTEIO; |
953 | goto error; | |
954 | } | |
955 | ||
574d356b DM |
956 | if (msize < 4096) { |
957 | p9_debug(P9_DEBUG_ERROR, | |
958 | "server returned a msize < 4096: %d\n", msize); | |
959 | err = -EREMOTEIO; | |
960 | goto error; | |
961 | } | |
51a87c55 EVH |
962 | if (msize < c->msize) |
963 | c->msize = msize; | |
6936bf60 EVH |
964 | |
965 | error: | |
51a87c55 | 966 | kfree(version); |
67dd8e44 | 967 | p9_req_put(c, req); |
6936bf60 EVH |
968 | |
969 | return err; | |
970 | } | |
6936bf60 EVH |
971 | |
972 | struct p9_client *p9_client_create(const char *dev_name, char *options) | |
973 | { | |
974 | int err; | |
975 | struct p9_client *clnt; | |
50192abe | 976 | char *client_id; |
6936bf60 EVH |
977 | |
978 | err = 0; | |
6e195b0f | 979 | clnt = kmalloc(sizeof(*clnt), GFP_KERNEL); |
bd238fb4 LI |
980 | if (!clnt) |
981 | return ERR_PTR(-ENOMEM); | |
982 | ||
72029fe8 | 983 | clnt->trans_mod = NULL; |
bb8ffdfc | 984 | clnt->trans = NULL; |
91a76be3 | 985 | clnt->fcall_cache = NULL; |
50192abe WD |
986 | |
987 | client_id = utsname()->nodename; | |
988 | memcpy(clnt->name, client_id, strlen(client_id) + 1); | |
989 | ||
bd238fb4 | 990 | spin_lock_init(&clnt->lock); |
f28cdf04 | 991 | idr_init(&clnt->fids); |
996d5b4d | 992 | idr_init(&clnt->reqs); |
fea511a6 | 993 | |
bb8ffdfc EVH |
994 | err = parse_opts(options, clnt); |
995 | if (err < 0) | |
996d5b4d | 996 | goto free_client; |
bb8ffdfc | 997 | |
a17d1720 AK |
998 | if (!clnt->trans_mod) |
999 | clnt->trans_mod = v9fs_get_default_trans(); | |
1000 | ||
6e195b0f | 1001 | if (!clnt->trans_mod) { |
8a0dc95f | 1002 | err = -EPROTONOSUPPORT; |
5d385153 JP |
1003 | p9_debug(P9_DEBUG_ERROR, |
1004 | "No transport defined or default transport\n"); | |
996d5b4d | 1005 | goto free_client; |
8781ff94 EVH |
1006 | } |
1007 | ||
5d385153 JP |
1008 | p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", |
1009 | clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); | |
8a0dc95f | 1010 | |
8b81ef58 EVH |
1011 | err = clnt->trans_mod->create(clnt, dev_name, options); |
1012 | if (err) | |
f28cdf04 | 1013 | goto put_trans; |
bd238fb4 | 1014 | |
15e2721b | 1015 | if (clnt->msize > clnt->trans_mod->maxsize) { |
c9ffb05c | 1016 | clnt->msize = clnt->trans_mod->maxsize; |
15e2721b CS |
1017 | pr_info("Limiting 'msize' to %d as this is the maximum " |
1018 | "supported by transport %s\n", | |
1019 | clnt->msize, clnt->trans_mod->name | |
1020 | ); | |
1021 | } | |
8a0dc95f | 1022 | |
574d356b DM |
1023 | if (clnt->msize < 4096) { |
1024 | p9_debug(P9_DEBUG_ERROR, | |
1025 | "Please specify a msize of at least 4k\n"); | |
1026 | err = -EINVAL; | |
bb06c388 | 1027 | goto close_trans; |
574d356b DM |
1028 | } |
1029 | ||
6936bf60 | 1030 | err = p9_client_version(clnt); |
bd238fb4 | 1031 | if (err) |
8781ff94 | 1032 | goto close_trans; |
bd238fb4 | 1033 | |
91a76be3 DM |
1034 | /* P9_HDRSZ + 4 is the smallest packet header we can have that is |
1035 | * followed by data accessed from userspace by read | |
1036 | */ | |
1037 | clnt->fcall_cache = | |
1038 | kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize, | |
1039 | 0, 0, P9_HDRSZ + 4, | |
1040 | clnt->msize - (P9_HDRSZ + 4), | |
1041 | NULL); | |
1042 | ||
bd238fb4 LI |
1043 | return clnt; |
1044 | ||
8781ff94 EVH |
1045 | close_trans: |
1046 | clnt->trans_mod->close(clnt); | |
8781ff94 EVH |
1047 | put_trans: |
1048 | v9fs_put_trans(clnt->trans_mod); | |
1049 | free_client: | |
1050 | kfree(clnt); | |
bd238fb4 LI |
1051 | return ERR_PTR(err); |
1052 | } | |
1053 | EXPORT_SYMBOL(p9_client_create); | |
1054 | ||
1055 | void p9_client_destroy(struct p9_client *clnt) | |
1056 | { | |
f28cdf04 MW |
1057 | struct p9_fid *fid; |
1058 | int id; | |
bd238fb4 | 1059 | |
5d385153 | 1060 | p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); |
bd238fb4 | 1061 | |
8b81ef58 EVH |
1062 | if (clnt->trans_mod) |
1063 | clnt->trans_mod->close(clnt); | |
bd238fb4 | 1064 | |
72029fe8 TH |
1065 | v9fs_put_trans(clnt->trans_mod); |
1066 | ||
f28cdf04 | 1067 | idr_for_each_entry(&clnt->fids, fid, id) { |
5d385153 | 1068 | pr_info("Found fid %d not clunked\n", fid->fid); |
bd238fb4 | 1069 | p9_fid_destroy(fid); |
6d96d3ab | 1070 | } |
bd238fb4 | 1071 | |
fea511a6 EVH |
1072 | p9_tag_cleanup(clnt); |
1073 | ||
91a76be3 | 1074 | kmem_cache_destroy(clnt->fcall_cache); |
bd238fb4 LI |
1075 | kfree(clnt); |
1076 | } | |
1077 | EXPORT_SYMBOL(p9_client_destroy); | |
1078 | ||
1079 | void p9_client_disconnect(struct p9_client *clnt) | |
1080 | { | |
5d385153 | 1081 | p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); |
8b81ef58 | 1082 | clnt->status = Disconnected; |
bd238fb4 LI |
1083 | } |
1084 | EXPORT_SYMBOL(p9_client_disconnect); | |
1085 | ||
6d96d3ab AK |
1086 | void p9_client_begin_disconnect(struct p9_client *clnt) |
1087 | { | |
5d385153 | 1088 | p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); |
6d96d3ab AK |
1089 | clnt->status = BeginDisconnect; |
1090 | } | |
1091 | EXPORT_SYMBOL(p9_client_begin_disconnect); | |
1092 | ||
bd238fb4 | 1093 | struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, |
6e195b0f DM |
1094 | const char *uname, kuid_t n_uname, |
1095 | const char *aname) | |
bd238fb4 | 1096 | { |
348b5901 | 1097 | int err = 0; |
51a87c55 | 1098 | struct p9_req_t *req; |
bd238fb4 | 1099 | struct p9_fid *fid; |
51a87c55 | 1100 | struct p9_qid qid; |
bd238fb4 | 1101 | |
5d385153 JP |
1102 | p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", |
1103 | afid ? afid->fid : -1, uname, aname); | |
bd238fb4 | 1104 | fid = p9_fid_create(clnt); |
b5303be2 MW |
1105 | if (!fid) { |
1106 | err = -ENOMEM; | |
bd238fb4 LI |
1107 | goto error; |
1108 | } | |
21c9f5cc | 1109 | fid->uid = n_uname; |
bd238fb4 | 1110 | |
f791f7c5 | 1111 | req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, |
6e195b0f | 1112 | afid ? afid->fid : P9_NOFID, uname, aname, n_uname); |
51a87c55 EVH |
1113 | if (IS_ERR(req)) { |
1114 | err = PTR_ERR(req); | |
bd238fb4 LI |
1115 | goto error; |
1116 | } | |
1117 | ||
523adb6c | 1118 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid); |
51a87c55 | 1119 | if (err) { |
523adb6c | 1120 | trace_9p_protocol_dump(clnt, &req->rc); |
67dd8e44 | 1121 | p9_req_put(clnt, req); |
bd238fb4 | 1122 | goto error; |
51a87c55 | 1123 | } |
bd238fb4 | 1124 | |
5d385153 | 1125 | p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", |
6e195b0f | 1126 | qid.type, qid.path, qid.version); |
51a87c55 EVH |
1127 | |
1128 | memmove(&fid->qid, &qid, sizeof(struct p9_qid)); | |
1129 | ||
67dd8e44 | 1130 | p9_req_put(clnt, req); |
bd238fb4 LI |
1131 | return fid; |
1132 | ||
1133 | error: | |
bd238fb4 LI |
1134 | if (fid) |
1135 | p9_fid_destroy(fid); | |
1136 | return ERR_PTR(err); | |
1137 | } | |
1138 | EXPORT_SYMBOL(p9_client_attach); | |
1139 | ||
b76225e2 | 1140 | struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, |
6e195b0f | 1141 | const unsigned char * const *wnames, int clone) |
bd238fb4 LI |
1142 | { |
1143 | int err; | |
bd238fb4 LI |
1144 | struct p9_client *clnt; |
1145 | struct p9_fid *fid; | |
51a87c55 EVH |
1146 | struct p9_qid *wqids; |
1147 | struct p9_req_t *req; | |
6e195b0f | 1148 | u16 nwqids, count; |
bd238fb4 | 1149 | |
bd238fb4 | 1150 | err = 0; |
62b2be59 | 1151 | wqids = NULL; |
bd238fb4 LI |
1152 | clnt = oldfid->clnt; |
1153 | if (clone) { | |
1154 | fid = p9_fid_create(clnt); | |
b5303be2 MW |
1155 | if (!fid) { |
1156 | err = -ENOMEM; | |
bd238fb4 LI |
1157 | goto error; |
1158 | } | |
1159 | ||
1160 | fid->uid = oldfid->uid; | |
6e195b0f | 1161 | } else { |
bd238fb4 | 1162 | fid = oldfid; |
6e195b0f | 1163 | } |
51a87c55 | 1164 | |
5d385153 JP |
1165 | p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", |
1166 | oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); | |
51a87c55 | 1167 | req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, |
6e195b0f | 1168 | nwname, wnames); |
51a87c55 EVH |
1169 | if (IS_ERR(req)) { |
1170 | err = PTR_ERR(req); | |
bd238fb4 LI |
1171 | goto error; |
1172 | } | |
1173 | ||
523adb6c | 1174 | err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids); |
e7f4b8f1 | 1175 | if (err) { |
523adb6c | 1176 | trace_9p_protocol_dump(clnt, &req->rc); |
67dd8e44 | 1177 | p9_req_put(clnt, req); |
51a87c55 | 1178 | goto clunk_fid; |
e7f4b8f1 | 1179 | } |
67dd8e44 | 1180 | p9_req_put(clnt, req); |
bd238fb4 | 1181 | |
5d385153 | 1182 | p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); |
51a87c55 EVH |
1183 | |
1184 | if (nwqids != nwname) { | |
bd238fb4 LI |
1185 | err = -ENOENT; |
1186 | goto clunk_fid; | |
1187 | } | |
1188 | ||
51a87c55 | 1189 | for (count = 0; count < nwqids; count++) |
5d385153 | 1190 | p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", |
6e195b0f DM |
1191 | count, wqids[count].type, |
1192 | wqids[count].path, | |
1193 | wqids[count].version); | |
51a87c55 | 1194 | |
bd238fb4 | 1195 | if (nwname) |
51a87c55 | 1196 | memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); |
bd238fb4 | 1197 | else |
154372e6 | 1198 | memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid)); |
bd238fb4 | 1199 | |
62b2be59 | 1200 | kfree(wqids); |
bd238fb4 LI |
1201 | return fid; |
1202 | ||
1203 | clunk_fid: | |
62b2be59 | 1204 | kfree(wqids); |
b48dbb99 | 1205 | p9_fid_put(fid); |
51a87c55 | 1206 | fid = NULL; |
bd238fb4 LI |
1207 | |
1208 | error: | |
6e195b0f | 1209 | if (fid && fid != oldfid) |
bd238fb4 LI |
1210 | p9_fid_destroy(fid); |
1211 | ||
1212 | return ERR_PTR(err); | |
1213 | } | |
1214 | EXPORT_SYMBOL(p9_client_walk); | |
1215 | ||
1216 | int p9_client_open(struct p9_fid *fid, int mode) | |
1217 | { | |
1218 | int err; | |
bd238fb4 | 1219 | struct p9_client *clnt; |
51a87c55 EVH |
1220 | struct p9_req_t *req; |
1221 | struct p9_qid qid; | |
1222 | int iounit; | |
bd238fb4 | 1223 | |
bd238fb4 | 1224 | clnt = fid->clnt; |
5d385153 | 1225 | p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", |
6e195b0f | 1226 | p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); |
ef56547e | 1227 | err = 0; |
bd238fb4 LI |
1228 | |
1229 | if (fid->mode != -1) | |
1230 | return -EINVAL; | |
1231 | ||
ef56547e | 1232 | if (p9_is_proto_dotl(clnt)) |
46c30cb8 | 1233 | req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode & P9L_MODE_MASK); |
ef56547e | 1234 | else |
46c30cb8 | 1235 | req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode & P9L_MODE_MASK); |
51a87c55 EVH |
1236 | if (IS_ERR(req)) { |
1237 | err = PTR_ERR(req); | |
1238 | goto error; | |
bd238fb4 LI |
1239 | } |
1240 | ||
523adb6c | 1241 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); |
e7f4b8f1 | 1242 | if (err) { |
523adb6c | 1243 | trace_9p_protocol_dump(clnt, &req->rc); |
e7f4b8f1 EVH |
1244 | goto free_and_error; |
1245 | } | |
51a87c55 | 1246 | |
5d385153 | 1247 | p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", |
6e195b0f DM |
1248 | p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, |
1249 | qid.path, qid.version, iounit); | |
bd238fb4 | 1250 | |
154372e6 | 1251 | memmove(&fid->qid, &qid, sizeof(struct p9_qid)); |
bd238fb4 | 1252 | fid->mode = mode; |
51a87c55 | 1253 | fid->iounit = iounit; |
bd238fb4 | 1254 | |
e7f4b8f1 | 1255 | free_and_error: |
67dd8e44 | 1256 | p9_req_put(clnt, req); |
51a87c55 | 1257 | error: |
bd238fb4 LI |
1258 | return err; |
1259 | } | |
1260 | EXPORT_SYMBOL(p9_client_open); | |
1261 | ||
6e195b0f DM |
1262 | int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, |
1263 | u32 mode, kgid_t gid, struct p9_qid *qid) | |
5643135a VJJ |
1264 | { |
1265 | int err = 0; | |
1266 | struct p9_client *clnt; | |
1267 | struct p9_req_t *req; | |
1268 | int iounit; | |
1269 | ||
5d385153 | 1270 | p9_debug(P9_DEBUG_9P, |
6e195b0f DM |
1271 | ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", |
1272 | ofid->fid, name, flags, mode, | |
1273 | from_kgid(&init_user_ns, gid)); | |
5643135a VJJ |
1274 | clnt = ofid->clnt; |
1275 | ||
1276 | if (ofid->mode != -1) | |
1277 | return -EINVAL; | |
1278 | ||
f791f7c5 | 1279 | req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, |
46c30cb8 | 1280 | mode & P9L_MODE_MASK, gid); |
5643135a VJJ |
1281 | if (IS_ERR(req)) { |
1282 | err = PTR_ERR(req); | |
1283 | goto error; | |
1284 | } | |
1285 | ||
523adb6c | 1286 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit); |
5643135a | 1287 | if (err) { |
523adb6c | 1288 | trace_9p_protocol_dump(clnt, &req->rc); |
5643135a VJJ |
1289 | goto free_and_error; |
1290 | } | |
1291 | ||
5d385153 | 1292 | p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", |
6e195b0f | 1293 | qid->type, qid->path, qid->version, iounit); |
5643135a | 1294 | |
154372e6 | 1295 | memmove(&ofid->qid, qid, sizeof(struct p9_qid)); |
3866584a | 1296 | ofid->mode = flags; |
5643135a VJJ |
1297 | ofid->iounit = iounit; |
1298 | ||
1299 | free_and_error: | |
67dd8e44 | 1300 | p9_req_put(clnt, req); |
5643135a VJJ |
1301 | error: |
1302 | return err; | |
1303 | } | |
1304 | EXPORT_SYMBOL(p9_client_create_dotl); | |
1305 | ||
7880b43b | 1306 | int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, |
bd238fb4 LI |
1307 | char *extension) |
1308 | { | |
1309 | int err; | |
bd238fb4 | 1310 | struct p9_client *clnt; |
51a87c55 EVH |
1311 | struct p9_req_t *req; |
1312 | struct p9_qid qid; | |
1313 | int iounit; | |
bd238fb4 | 1314 | |
5d385153 | 1315 | p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", |
6e195b0f | 1316 | fid->fid, name, perm, mode); |
bd238fb4 | 1317 | err = 0; |
bd238fb4 LI |
1318 | clnt = fid->clnt; |
1319 | ||
1320 | if (fid->mode != -1) | |
1321 | return -EINVAL; | |
1322 | ||
51a87c55 | 1323 | req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, |
46c30cb8 | 1324 | mode & P9L_MODE_MASK, extension); |
51a87c55 EVH |
1325 | if (IS_ERR(req)) { |
1326 | err = PTR_ERR(req); | |
1327 | goto error; | |
bd238fb4 LI |
1328 | } |
1329 | ||
523adb6c | 1330 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); |
e7f4b8f1 | 1331 | if (err) { |
523adb6c | 1332 | trace_9p_protocol_dump(clnt, &req->rc); |
e7f4b8f1 EVH |
1333 | goto free_and_error; |
1334 | } | |
51a87c55 | 1335 | |
5d385153 | 1336 | p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", |
6e195b0f | 1337 | qid.type, qid.path, qid.version, iounit); |
bd238fb4 | 1338 | |
154372e6 | 1339 | memmove(&fid->qid, &qid, sizeof(struct p9_qid)); |
bd238fb4 | 1340 | fid->mode = mode; |
51a87c55 | 1341 | fid->iounit = iounit; |
bd238fb4 | 1342 | |
e7f4b8f1 | 1343 | free_and_error: |
67dd8e44 | 1344 | p9_req_put(clnt, req); |
51a87c55 | 1345 | error: |
bd238fb4 LI |
1346 | return err; |
1347 | } | |
1348 | EXPORT_SYMBOL(p9_client_fcreate); | |
1349 | ||
7880b43b | 1350 | int p9_client_symlink(struct p9_fid *dfid, const char *name, |
6e195b0f | 1351 | const char *symtgt, kgid_t gid, struct p9_qid *qid) |
50cc42ff VJJ |
1352 | { |
1353 | int err = 0; | |
1354 | struct p9_client *clnt; | |
1355 | struct p9_req_t *req; | |
1356 | ||
5d385153 | 1357 | p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", |
6e195b0f | 1358 | dfid->fid, name, symtgt); |
50cc42ff VJJ |
1359 | clnt = dfid->clnt; |
1360 | ||
f791f7c5 | 1361 | req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, |
6e195b0f | 1362 | gid); |
50cc42ff VJJ |
1363 | if (IS_ERR(req)) { |
1364 | err = PTR_ERR(req); | |
1365 | goto error; | |
1366 | } | |
1367 | ||
523adb6c | 1368 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); |
50cc42ff | 1369 | if (err) { |
523adb6c | 1370 | trace_9p_protocol_dump(clnt, &req->rc); |
50cc42ff VJJ |
1371 | goto free_and_error; |
1372 | } | |
1373 | ||
5d385153 | 1374 | p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", |
6e195b0f | 1375 | qid->type, qid->path, qid->version); |
50cc42ff VJJ |
1376 | |
1377 | free_and_error: | |
67dd8e44 | 1378 | p9_req_put(clnt, req); |
50cc42ff VJJ |
1379 | error: |
1380 | return err; | |
1381 | } | |
1382 | EXPORT_SYMBOL(p9_client_symlink); | |
1383 | ||
7880b43b | 1384 | int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) |
652df9a7 VJJ |
1385 | { |
1386 | struct p9_client *clnt; | |
1387 | struct p9_req_t *req; | |
1388 | ||
5d385153 | 1389 | p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", |
6e195b0f | 1390 | dfid->fid, oldfid->fid, newname); |
652df9a7 VJJ |
1391 | clnt = dfid->clnt; |
1392 | req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, | |
6e195b0f | 1393 | newname); |
652df9a7 VJJ |
1394 | if (IS_ERR(req)) |
1395 | return PTR_ERR(req); | |
1396 | ||
5d385153 | 1397 | p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); |
67dd8e44 | 1398 | p9_req_put(clnt, req); |
652df9a7 VJJ |
1399 | return 0; |
1400 | } | |
1401 | EXPORT_SYMBOL(p9_client_link); | |
1402 | ||
b165d601 | 1403 | int p9_client_fsync(struct p9_fid *fid, int datasync) |
920e65dc VJJ |
1404 | { |
1405 | int err; | |
1406 | struct p9_client *clnt; | |
1407 | struct p9_req_t *req; | |
1408 | ||
5d385153 | 1409 | p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", |
6e195b0f | 1410 | fid->fid, datasync); |
920e65dc VJJ |
1411 | err = 0; |
1412 | clnt = fid->clnt; | |
1413 | ||
b165d601 | 1414 | req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); |
920e65dc VJJ |
1415 | if (IS_ERR(req)) { |
1416 | err = PTR_ERR(req); | |
1417 | goto error; | |
1418 | } | |
1419 | ||
5d385153 | 1420 | p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); |
920e65dc | 1421 | |
67dd8e44 | 1422 | p9_req_put(clnt, req); |
920e65dc VJJ |
1423 | |
1424 | error: | |
1425 | return err; | |
1426 | } | |
1427 | EXPORT_SYMBOL(p9_client_fsync); | |
1428 | ||
bd238fb4 LI |
1429 | int p9_client_clunk(struct p9_fid *fid) |
1430 | { | |
1431 | int err; | |
bd238fb4 | 1432 | struct p9_client *clnt; |
51a87c55 | 1433 | struct p9_req_t *req; |
208f3c28 | 1434 | int retries = 0; |
bd238fb4 | 1435 | |
208f3c28 | 1436 | again: |
6e195b0f DM |
1437 | p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", |
1438 | fid->fid, retries); | |
bd238fb4 | 1439 | err = 0; |
bd238fb4 LI |
1440 | clnt = fid->clnt; |
1441 | ||
51a87c55 EVH |
1442 | req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); |
1443 | if (IS_ERR(req)) { | |
1444 | err = PTR_ERR(req); | |
1445 | goto error; | |
bd238fb4 LI |
1446 | } |
1447 | ||
5d385153 | 1448 | p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); |
bd238fb4 | 1449 | |
67dd8e44 | 1450 | p9_req_put(clnt, req); |
51a87c55 | 1451 | error: |
6e195b0f | 1452 | /* Fid is not valid even after a failed clunk |
208f3c28 JG |
1453 | * If interrupted, retry once then give up and |
1454 | * leak fid until umount. | |
5034990e | 1455 | */ |
208f3c28 JG |
1456 | if (err == -ERESTARTSYS) { |
1457 | if (retries++ == 0) | |
1458 | goto again; | |
6e195b0f | 1459 | } else { |
208f3c28 | 1460 | p9_fid_destroy(fid); |
6e195b0f | 1461 | } |
bd238fb4 LI |
1462 | return err; |
1463 | } | |
1464 | EXPORT_SYMBOL(p9_client_clunk); | |
1465 | ||
1466 | int p9_client_remove(struct p9_fid *fid) | |
1467 | { | |
1468 | int err; | |
bd238fb4 | 1469 | struct p9_client *clnt; |
51a87c55 | 1470 | struct p9_req_t *req; |
bd238fb4 | 1471 | |
5d385153 | 1472 | p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); |
bd238fb4 | 1473 | err = 0; |
bd238fb4 LI |
1474 | clnt = fid->clnt; |
1475 | ||
51a87c55 EVH |
1476 | req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); |
1477 | if (IS_ERR(req)) { | |
1478 | err = PTR_ERR(req); | |
1479 | goto error; | |
bd238fb4 LI |
1480 | } |
1481 | ||
5d385153 | 1482 | p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); |
bd238fb4 | 1483 | |
67dd8e44 | 1484 | p9_req_put(clnt, req); |
51a87c55 | 1485 | error: |
208f3c28 | 1486 | if (err == -ERESTARTSYS) |
b48dbb99 | 1487 | p9_fid_put(fid); |
208f3c28 JG |
1488 | else |
1489 | p9_fid_destroy(fid); | |
bd238fb4 LI |
1490 | return err; |
1491 | } | |
1492 | EXPORT_SYMBOL(p9_client_remove); | |
1493 | ||
48e370ff AK |
1494 | int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) |
1495 | { | |
1496 | int err = 0; | |
1497 | struct p9_req_t *req; | |
1498 | struct p9_client *clnt; | |
1499 | ||
5d385153 | 1500 | p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", |
6e195b0f | 1501 | dfid->fid, name, flags); |
48e370ff AK |
1502 | |
1503 | clnt = dfid->clnt; | |
1504 | req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); | |
1505 | if (IS_ERR(req)) { | |
1506 | err = PTR_ERR(req); | |
1507 | goto error; | |
1508 | } | |
5d385153 | 1509 | p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); |
48e370ff | 1510 | |
67dd8e44 | 1511 | p9_req_put(clnt, req); |
48e370ff AK |
1512 | error: |
1513 | return err; | |
1514 | } | |
1515 | EXPORT_SYMBOL(p9_client_unlinkat); | |
1516 | ||
0fc9655e | 1517 | int |
e1200fe6 | 1518 | p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) |
bd238fb4 | 1519 | { |
e1200fe6 | 1520 | int total = 0; |
999b8b88 | 1521 | *err = 0; |
bd238fb4 | 1522 | |
388f6966 SA |
1523 | while (iov_iter_count(to)) { |
1524 | int count; | |
1525 | ||
1526 | count = p9_client_read_once(fid, offset, to, err); | |
1527 | if (!count || *err) | |
1528 | break; | |
1529 | offset += count; | |
1530 | total += count; | |
1531 | } | |
1532 | return total; | |
1533 | } | |
1534 | EXPORT_SYMBOL(p9_client_read); | |
1535 | ||
1536 | int | |
1537 | p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to, | |
1538 | int *err) | |
1539 | { | |
1540 | struct p9_client *clnt = fid->clnt; | |
1541 | struct p9_req_t *req; | |
1542 | int count = iov_iter_count(to); | |
7f024647 | 1543 | int rsize, received, non_zc = 0; |
388f6966 SA |
1544 | char *dataptr; |
1545 | ||
1546 | *err = 0; | |
6e195b0f DM |
1547 | p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %zu\n", |
1548 | fid->fid, offset, iov_iter_count(to)); | |
e1200fe6 | 1549 | |
388f6966 SA |
1550 | rsize = fid->iounit; |
1551 | if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) | |
1552 | rsize = clnt->msize - P9_IOHDRSZ; | |
c69f297d | 1553 | |
388f6966 SA |
1554 | if (count < rsize) |
1555 | rsize = count; | |
e1200fe6 | 1556 | |
388f6966 SA |
1557 | /* Don't bother zerocopy for small IO (< 1024) */ |
1558 | if (clnt->trans_mod->zc_request && rsize > 1024) { | |
1559 | /* response header len is 11 | |
1560 | * PDU Header(7) + IO Size (4) | |
1561 | */ | |
1562 | req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, | |
1563 | 0, 11, "dqd", fid->fid, | |
1564 | offset, rsize); | |
1565 | } else { | |
1566 | non_zc = 1; | |
1567 | req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, | |
1568 | rsize); | |
1569 | } | |
1570 | if (IS_ERR(req)) { | |
1571 | *err = PTR_ERR(req); | |
7f024647 AV |
1572 | if (!non_zc) |
1573 | iov_iter_revert(to, count - iov_iter_count(to)); | |
388f6966 SA |
1574 | return 0; |
1575 | } | |
e1200fe6 | 1576 | |
388f6966 | 1577 | *err = p9pdu_readf(&req->rc, clnt->proto_version, |
7f024647 | 1578 | "D", &received, &dataptr); |
388f6966 | 1579 | if (*err) { |
7f024647 AV |
1580 | if (!non_zc) |
1581 | iov_iter_revert(to, count - iov_iter_count(to)); | |
388f6966 | 1582 | trace_9p_protocol_dump(clnt, &req->rc); |
67dd8e44 | 1583 | p9_req_put(clnt, req); |
388f6966 SA |
1584 | return 0; |
1585 | } | |
7f024647 AV |
1586 | if (rsize < received) { |
1587 | pr_err("bogus RREAD count (%d > %d)\n", received, rsize); | |
1588 | received = rsize; | |
388f6966 | 1589 | } |
bd238fb4 | 1590 | |
388f6966 | 1591 | p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); |
bd238fb4 | 1592 | |
388f6966 | 1593 | if (non_zc) { |
7f024647 | 1594 | int n = copy_to_iter(dataptr, received, to); |
bd238fb4 | 1595 | |
7f024647 | 1596 | if (n != received) { |
388f6966 | 1597 | *err = -EFAULT; |
67dd8e44 | 1598 | p9_req_put(clnt, req); |
388f6966 | 1599 | return n; |
e1200fe6 | 1600 | } |
388f6966 | 1601 | } else { |
7f024647 | 1602 | iov_iter_revert(to, count - received - iov_iter_count(to)); |
51a87c55 | 1603 | } |
67dd8e44 | 1604 | p9_req_put(clnt, req); |
7f024647 | 1605 | return received; |
bd238fb4 | 1606 | } |
388f6966 | 1607 | EXPORT_SYMBOL(p9_client_read_once); |
bd238fb4 LI |
1608 | |
1609 | int | |
070b3656 | 1610 | p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) |
bd238fb4 | 1611 | { |
070b3656 | 1612 | struct p9_client *clnt = fid->clnt; |
51a87c55 | 1613 | struct p9_req_t *req; |
070b3656 | 1614 | int total = 0; |
999b8b88 | 1615 | *err = 0; |
070b3656 AV |
1616 | |
1617 | p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n", | |
6e195b0f | 1618 | fid->fid, offset, iov_iter_count(from)); |
070b3656 AV |
1619 | |
1620 | while (iov_iter_count(from)) { | |
1621 | int count = iov_iter_count(from); | |
1622 | int rsize = fid->iounit; | |
7f024647 | 1623 | int written; |
6e195b0f DM |
1624 | |
1625 | if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) | |
070b3656 AV |
1626 | rsize = clnt->msize - P9_IOHDRSZ; |
1627 | ||
1628 | if (count < rsize) | |
1629 | rsize = count; | |
1630 | ||
1631 | /* Don't bother zerocopy for small IO (< 1024) */ | |
1632 | if (clnt->trans_mod->zc_request && rsize > 1024) { | |
1633 | req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, | |
1634 | rsize, P9_ZC_HDR_SZ, "dqd", | |
1635 | fid->fid, offset, rsize); | |
1636 | } else { | |
1637 | req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, | |
6e195b0f | 1638 | offset, rsize, from); |
070b3656 AV |
1639 | } |
1640 | if (IS_ERR(req)) { | |
7f024647 | 1641 | iov_iter_revert(from, count - iov_iter_count(from)); |
070b3656 AV |
1642 | *err = PTR_ERR(req); |
1643 | break; | |
1644 | } | |
bd238fb4 | 1645 | |
7f024647 | 1646 | *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &written); |
070b3656 | 1647 | if (*err) { |
7f024647 | 1648 | iov_iter_revert(from, count - iov_iter_count(from)); |
523adb6c | 1649 | trace_9p_protocol_dump(clnt, &req->rc); |
67dd8e44 | 1650 | p9_req_put(clnt, req); |
67e808fb | 1651 | break; |
070b3656 | 1652 | } |
7f024647 AV |
1653 | if (rsize < written) { |
1654 | pr_err("bogus RWRITE count (%d > %d)\n", written, rsize); | |
1655 | written = rsize; | |
0f1db7de | 1656 | } |
1fc52481 | 1657 | |
070b3656 | 1658 | p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); |
0fc9655e | 1659 | |
67dd8e44 | 1660 | p9_req_put(clnt, req); |
7f024647 AV |
1661 | iov_iter_revert(from, count - written - iov_iter_count(from)); |
1662 | total += written; | |
1663 | offset += written; | |
e7f4b8f1 | 1664 | } |
070b3656 | 1665 | return total; |
bd238fb4 | 1666 | } |
0fc9655e | 1667 | EXPORT_SYMBOL(p9_client_write); |
bd238fb4 | 1668 | |
51a87c55 | 1669 | struct p9_wstat *p9_client_stat(struct p9_fid *fid) |
5503ac56 | 1670 | { |
51a87c55 EVH |
1671 | int err; |
1672 | struct p9_client *clnt; | |
6e195b0f | 1673 | struct p9_wstat *ret; |
51a87c55 EVH |
1674 | struct p9_req_t *req; |
1675 | u16 ignored; | |
5503ac56 | 1676 | |
5d385153 | 1677 | p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); |
5503ac56 | 1678 | |
6e195b0f | 1679 | ret = kmalloc(sizeof(*ret), GFP_KERNEL); |
5503ac56 EVH |
1680 | if (!ret) |
1681 | return ERR_PTR(-ENOMEM); | |
1682 | ||
bd238fb4 | 1683 | err = 0; |
bd238fb4 LI |
1684 | clnt = fid->clnt; |
1685 | ||
51a87c55 EVH |
1686 | req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); |
1687 | if (IS_ERR(req)) { | |
1688 | err = PTR_ERR(req); | |
bd238fb4 LI |
1689 | goto error; |
1690 | } | |
1691 | ||
523adb6c | 1692 | err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret); |
e7f4b8f1 | 1693 | if (err) { |
523adb6c | 1694 | trace_9p_protocol_dump(clnt, &req->rc); |
67dd8e44 | 1695 | p9_req_put(clnt, req); |
eedfe1c4 | 1696 | goto error; |
e7f4b8f1 | 1697 | } |
bd238fb4 | 1698 | |
5d385153 | 1699 | p9_debug(P9_DEBUG_9P, |
6e195b0f DM |
1700 | "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" |
1701 | "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" | |
1702 | "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" | |
1703 | "<<< uid=%d gid=%d n_muid=%d\n", | |
1704 | ret->size, ret->type, ret->dev, ret->qid.type, ret->qid.path, | |
1705 | ret->qid.version, ret->mode, | |
1706 | ret->atime, ret->mtime, ret->length, | |
1707 | ret->name, ret->uid, ret->gid, ret->muid, ret->extension, | |
1708 | from_kuid(&init_user_ns, ret->n_uid), | |
1709 | from_kgid(&init_user_ns, ret->n_gid), | |
1710 | from_kuid(&init_user_ns, ret->n_muid)); | |
bd238fb4 | 1711 | |
67dd8e44 | 1712 | p9_req_put(clnt, req); |
742b11a7 LI |
1713 | return ret; |
1714 | ||
bd238fb4 | 1715 | error: |
742b11a7 LI |
1716 | kfree(ret); |
1717 | return ERR_PTR(err); | |
bd238fb4 LI |
1718 | } |
1719 | EXPORT_SYMBOL(p9_client_stat); | |
1720 | ||
f0853122 | 1721 | struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, |
6e195b0f | 1722 | u64 request_mask) |
f0853122 SK |
1723 | { |
1724 | int err; | |
1725 | struct p9_client *clnt; | |
6e195b0f | 1726 | struct p9_stat_dotl *ret; |
f0853122 SK |
1727 | struct p9_req_t *req; |
1728 | ||
5d385153 | 1729 | p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", |
6e195b0f | 1730 | fid->fid, request_mask); |
f0853122 | 1731 | |
6e195b0f | 1732 | ret = kmalloc(sizeof(*ret), GFP_KERNEL); |
f0853122 SK |
1733 | if (!ret) |
1734 | return ERR_PTR(-ENOMEM); | |
1735 | ||
1736 | err = 0; | |
1737 | clnt = fid->clnt; | |
1738 | ||
1739 | req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); | |
1740 | if (IS_ERR(req)) { | |
1741 | err = PTR_ERR(req); | |
1742 | goto error; | |
1743 | } | |
1744 | ||
523adb6c | 1745 | err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret); |
f0853122 | 1746 | if (err) { |
523adb6c | 1747 | trace_9p_protocol_dump(clnt, &req->rc); |
67dd8e44 | 1748 | p9_req_put(clnt, req); |
f0853122 SK |
1749 | goto error; |
1750 | } | |
1751 | ||
6e195b0f DM |
1752 | p9_debug(P9_DEBUG_9P, "<<< RGETATTR st_result_mask=%lld\n" |
1753 | "<<< qid=%x.%llx.%x\n" | |
1754 | "<<< st_mode=%8.8x st_nlink=%llu\n" | |
1755 | "<<< st_uid=%d st_gid=%d\n" | |
1756 | "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" | |
1757 | "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" | |
1758 | "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" | |
1759 | "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" | |
1760 | "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" | |
1761 | "<<< st_gen=%lld st_data_version=%lld\n", | |
1762 | ret->st_result_mask, | |
1763 | ret->qid.type, ret->qid.path, ret->qid.version, | |
1764 | ret->st_mode, ret->st_nlink, | |
1765 | from_kuid(&init_user_ns, ret->st_uid), | |
1766 | from_kgid(&init_user_ns, ret->st_gid), | |
1767 | ret->st_rdev, ret->st_size, ret->st_blksize, ret->st_blocks, | |
1768 | ret->st_atime_sec, ret->st_atime_nsec, | |
1769 | ret->st_mtime_sec, ret->st_mtime_nsec, | |
1770 | ret->st_ctime_sec, ret->st_ctime_nsec, | |
1771 | ret->st_btime_sec, ret->st_btime_nsec, | |
1772 | ret->st_gen, ret->st_data_version); | |
f0853122 | 1773 | |
67dd8e44 | 1774 | p9_req_put(clnt, req); |
f0853122 SK |
1775 | return ret; |
1776 | ||
1777 | error: | |
1778 | kfree(ret); | |
1779 | return ERR_PTR(err); | |
1780 | } | |
1781 | EXPORT_SYMBOL(p9_client_getattr_dotl); | |
1782 | ||
342fee1d | 1783 | static int p9_client_statsize(struct p9_wstat *wst, int proto_version) |
453ed90d LI |
1784 | { |
1785 | int ret; | |
1786 | ||
9d6939da | 1787 | /* NOTE: size shouldn't include its own length */ |
453ed90d LI |
1788 | /* size[2] type[2] dev[4] qid[13] */ |
1789 | /* mode[4] atime[4] mtime[4] length[8]*/ | |
1790 | /* name[s] uid[s] gid[s] muid[s] */ | |
6e195b0f | 1791 | ret = 2 + 4 + 13 + 4 + 4 + 4 + 8 + 2 + 2 + 2 + 2; |
453ed90d LI |
1792 | |
1793 | if (wst->name) | |
1794 | ret += strlen(wst->name); | |
1795 | if (wst->uid) | |
1796 | ret += strlen(wst->uid); | |
1797 | if (wst->gid) | |
1798 | ret += strlen(wst->gid); | |
1799 | if (wst->muid) | |
1800 | ret += strlen(wst->muid); | |
1801 | ||
6e195b0f DM |
1802 | if (proto_version == p9_proto_2000u || |
1803 | proto_version == p9_proto_2000L) { | |
1804 | /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ | |
1805 | ret += 2 + 4 + 4 + 4; | |
453ed90d LI |
1806 | if (wst->extension) |
1807 | ret += strlen(wst->extension); | |
1808 | } | |
1809 | ||
1810 | return ret; | |
1811 | } | |
1812 | ||
bd238fb4 LI |
1813 | int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) |
1814 | { | |
1815 | int err; | |
51a87c55 | 1816 | struct p9_req_t *req; |
bd238fb4 LI |
1817 | struct p9_client *clnt; |
1818 | ||
453ed90d LI |
1819 | err = 0; |
1820 | clnt = fid->clnt; | |
342fee1d | 1821 | wst->size = p9_client_statsize(wst, clnt->proto_version); |
6e195b0f DM |
1822 | p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", |
1823 | fid->fid); | |
5d385153 | 1824 | p9_debug(P9_DEBUG_9P, |
6e195b0f DM |
1825 | " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" |
1826 | " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" | |
1827 | " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" | |
1828 | " uid=%d gid=%d n_muid=%d\n", | |
1829 | wst->size, wst->type, wst->dev, wst->qid.type, | |
1830 | wst->qid.path, wst->qid.version, | |
1831 | wst->mode, wst->atime, wst->mtime, wst->length, | |
1832 | wst->name, wst->uid, wst->gid, wst->muid, wst->extension, | |
1833 | from_kuid(&init_user_ns, wst->n_uid), | |
1834 | from_kgid(&init_user_ns, wst->n_gid), | |
1835 | from_kuid(&init_user_ns, wst->n_muid)); | |
1836 | ||
1837 | req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", | |
1838 | fid->fid, wst->size + 2, wst); | |
51a87c55 EVH |
1839 | if (IS_ERR(req)) { |
1840 | err = PTR_ERR(req); | |
1841 | goto error; | |
bd238fb4 LI |
1842 | } |
1843 | ||
5d385153 | 1844 | p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); |
bd238fb4 | 1845 | |
67dd8e44 | 1846 | p9_req_put(clnt, req); |
51a87c55 | 1847 | error: |
bd238fb4 LI |
1848 | return err; |
1849 | } | |
1850 | EXPORT_SYMBOL(p9_client_wstat); | |
bda8e775 | 1851 | |
87d7845a SK |
1852 | int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) |
1853 | { | |
1854 | int err; | |
1855 | struct p9_req_t *req; | |
1856 | struct p9_client *clnt; | |
1857 | ||
1858 | err = 0; | |
1859 | clnt = fid->clnt; | |
5d385153 | 1860 | p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); |
6e195b0f DM |
1861 | p9_debug(P9_DEBUG_9P, " valid=%x mode=%x uid=%d gid=%d size=%lld\n", |
1862 | p9attr->valid, p9attr->mode, | |
1863 | from_kuid(&init_user_ns, p9attr->uid), | |
1864 | from_kgid(&init_user_ns, p9attr->gid), | |
1865 | p9attr->size); | |
1866 | p9_debug(P9_DEBUG_9P, " atime_sec=%lld atime_nsec=%lld\n", | |
1867 | p9attr->atime_sec, p9attr->atime_nsec); | |
1868 | p9_debug(P9_DEBUG_9P, " mtime_sec=%lld mtime_nsec=%lld\n", | |
1869 | p9attr->mtime_sec, p9attr->mtime_nsec); | |
87d7845a SK |
1870 | |
1871 | req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); | |
1872 | ||
1873 | if (IS_ERR(req)) { | |
1874 | err = PTR_ERR(req); | |
1875 | goto error; | |
1876 | } | |
5d385153 | 1877 | p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); |
67dd8e44 | 1878 | p9_req_put(clnt, req); |
87d7845a SK |
1879 | error: |
1880 | return err; | |
1881 | } | |
1882 | EXPORT_SYMBOL(p9_client_setattr); | |
1883 | ||
bda8e775 SK |
1884 | int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) |
1885 | { | |
1886 | int err; | |
1887 | struct p9_req_t *req; | |
1888 | struct p9_client *clnt; | |
1889 | ||
1890 | err = 0; | |
1891 | clnt = fid->clnt; | |
1892 | ||
5d385153 | 1893 | p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); |
bda8e775 SK |
1894 | |
1895 | req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); | |
1896 | if (IS_ERR(req)) { | |
1897 | err = PTR_ERR(req); | |
1898 | goto error; | |
1899 | } | |
1900 | ||
523adb6c DM |
1901 | err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, |
1902 | &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, | |
1903 | &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); | |
bda8e775 | 1904 | if (err) { |
523adb6c | 1905 | trace_9p_protocol_dump(clnt, &req->rc); |
67dd8e44 | 1906 | p9_req_put(clnt, req); |
bda8e775 SK |
1907 | goto error; |
1908 | } | |
1909 | ||
6e195b0f DM |
1910 | p9_debug(P9_DEBUG_9P, |
1911 | "<<< RSTATFS fid %d type 0x%x bsize %u blocks %llu bfree %llu bavail %llu files %llu ffree %llu fsid %llu namelen %u\n", | |
1912 | fid->fid, sb->type, sb->bsize, sb->blocks, sb->bfree, | |
1913 | sb->bavail, sb->files, sb->ffree, sb->fsid, sb->namelen); | |
bda8e775 | 1914 | |
67dd8e44 | 1915 | p9_req_put(clnt, req); |
bda8e775 SK |
1916 | error: |
1917 | return err; | |
1918 | } | |
1919 | EXPORT_SYMBOL(p9_client_statfs); | |
4681dbda | 1920 | |
9e8fb38e AK |
1921 | int p9_client_rename(struct p9_fid *fid, |
1922 | struct p9_fid *newdirfid, const char *name) | |
4681dbda SK |
1923 | { |
1924 | int err; | |
1925 | struct p9_req_t *req; | |
1926 | struct p9_client *clnt; | |
1927 | ||
1928 | err = 0; | |
1929 | clnt = fid->clnt; | |
1930 | ||
5d385153 | 1931 | p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", |
6e195b0f | 1932 | fid->fid, newdirfid->fid, name); |
4681dbda SK |
1933 | |
1934 | req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, | |
6e195b0f | 1935 | newdirfid->fid, name); |
4681dbda SK |
1936 | if (IS_ERR(req)) { |
1937 | err = PTR_ERR(req); | |
1938 | goto error; | |
1939 | } | |
1940 | ||
5d385153 | 1941 | p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); |
4681dbda | 1942 | |
67dd8e44 | 1943 | p9_req_put(clnt, req); |
4681dbda SK |
1944 | error: |
1945 | return err; | |
1946 | } | |
1947 | EXPORT_SYMBOL(p9_client_rename); | |
1948 | ||
9e8fb38e AK |
1949 | int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, |
1950 | struct p9_fid *newdirfid, const char *new_name) | |
1951 | { | |
1952 | int err; | |
1953 | struct p9_req_t *req; | |
1954 | struct p9_client *clnt; | |
1955 | ||
1956 | err = 0; | |
1957 | clnt = olddirfid->clnt; | |
1958 | ||
6e195b0f DM |
1959 | p9_debug(P9_DEBUG_9P, |
1960 | ">>> TRENAMEAT olddirfid %d old name %s newdirfid %d new name %s\n", | |
1961 | olddirfid->fid, old_name, newdirfid->fid, new_name); | |
9e8fb38e AK |
1962 | |
1963 | req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, | |
1964 | old_name, newdirfid->fid, new_name); | |
1965 | if (IS_ERR(req)) { | |
1966 | err = PTR_ERR(req); | |
1967 | goto error; | |
1968 | } | |
1969 | ||
5d385153 | 1970 | p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", |
6e195b0f | 1971 | newdirfid->fid, new_name); |
9e8fb38e | 1972 | |
67dd8e44 | 1973 | p9_req_put(clnt, req); |
9e8fb38e AK |
1974 | error: |
1975 | return err; | |
1976 | } | |
1977 | EXPORT_SYMBOL(p9_client_renameat); | |
1978 | ||
6e195b0f | 1979 | /* An xattrwalk without @attr_name gives the fid for the lisxattr namespace |
0ef63f34 AK |
1980 | */ |
1981 | struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, | |
6e195b0f | 1982 | const char *attr_name, u64 *attr_size) |
0ef63f34 AK |
1983 | { |
1984 | int err; | |
1985 | struct p9_req_t *req; | |
1986 | struct p9_client *clnt; | |
1987 | struct p9_fid *attr_fid; | |
1988 | ||
1989 | err = 0; | |
1990 | clnt = file_fid->clnt; | |
1991 | attr_fid = p9_fid_create(clnt); | |
b5303be2 MW |
1992 | if (!attr_fid) { |
1993 | err = -ENOMEM; | |
0ef63f34 AK |
1994 | goto error; |
1995 | } | |
5d385153 | 1996 | p9_debug(P9_DEBUG_9P, |
6e195b0f DM |
1997 | ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", |
1998 | file_fid->fid, attr_fid->fid, attr_name); | |
0ef63f34 AK |
1999 | |
2000 | req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", | |
6e195b0f | 2001 | file_fid->fid, attr_fid->fid, attr_name); |
0ef63f34 AK |
2002 | if (IS_ERR(req)) { |
2003 | err = PTR_ERR(req); | |
2004 | goto error; | |
2005 | } | |
523adb6c | 2006 | err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size); |
0ef63f34 | 2007 | if (err) { |
523adb6c | 2008 | trace_9p_protocol_dump(clnt, &req->rc); |
67dd8e44 | 2009 | p9_req_put(clnt, req); |
0ef63f34 AK |
2010 | goto clunk_fid; |
2011 | } | |
67dd8e44 | 2012 | p9_req_put(clnt, req); |
5d385153 | 2013 | p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", |
6e195b0f | 2014 | attr_fid->fid, *attr_size); |
0ef63f34 AK |
2015 | return attr_fid; |
2016 | clunk_fid: | |
b48dbb99 | 2017 | p9_fid_put(attr_fid); |
0ef63f34 AK |
2018 | attr_fid = NULL; |
2019 | error: | |
6e195b0f | 2020 | if (attr_fid && attr_fid != file_fid) |
0ef63f34 AK |
2021 | p9_fid_destroy(attr_fid); |
2022 | ||
2023 | return ERR_PTR(err); | |
2024 | } | |
2025 | EXPORT_SYMBOL_GPL(p9_client_xattrwalk); | |
2026 | ||
eda25e46 | 2027 | int p9_client_xattrcreate(struct p9_fid *fid, const char *name, |
6e195b0f | 2028 | u64 attr_size, int flags) |
eda25e46 AK |
2029 | { |
2030 | int err; | |
2031 | struct p9_req_t *req; | |
2032 | struct p9_client *clnt; | |
2033 | ||
5d385153 | 2034 | p9_debug(P9_DEBUG_9P, |
6e195b0f DM |
2035 | ">>> TXATTRCREATE fid %d name %s size %llu flag %d\n", |
2036 | fid->fid, name, attr_size, flags); | |
eda25e46 AK |
2037 | err = 0; |
2038 | clnt = fid->clnt; | |
2039 | req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", | |
6e195b0f | 2040 | fid->fid, name, attr_size, flags); |
eda25e46 AK |
2041 | if (IS_ERR(req)) { |
2042 | err = PTR_ERR(req); | |
2043 | goto error; | |
2044 | } | |
5d385153 | 2045 | p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); |
67dd8e44 | 2046 | p9_req_put(clnt, req); |
eda25e46 AK |
2047 | error: |
2048 | return err; | |
2049 | } | |
2050 | EXPORT_SYMBOL_GPL(p9_client_xattrcreate); | |
2051 | ||
7751bdb3 SK |
2052 | int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) |
2053 | { | |
abfa034e | 2054 | int err, rsize, non_zc = 0; |
7751bdb3 SK |
2055 | struct p9_client *clnt; |
2056 | struct p9_req_t *req; | |
2057 | char *dataptr; | |
4f3b35c1 AV |
2058 | struct kvec kv = {.iov_base = data, .iov_len = count}; |
2059 | struct iov_iter to; | |
2060 | ||
de4eda9d | 2061 | iov_iter_kvec(&to, ITER_DEST, &kv, 1, count); |
7751bdb3 | 2062 | |
5d385153 | 2063 | p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", |
6e195b0f | 2064 | fid->fid, offset, count); |
7751bdb3 SK |
2065 | |
2066 | err = 0; | |
2067 | clnt = fid->clnt; | |
7751bdb3 SK |
2068 | |
2069 | rsize = fid->iounit; | |
6e195b0f | 2070 | if (!rsize || rsize > clnt->msize - P9_READDIRHDRSZ) |
7751bdb3 SK |
2071 | rsize = clnt->msize - P9_READDIRHDRSZ; |
2072 | ||
2073 | if (count < rsize) | |
2074 | rsize = count; | |
2075 | ||
abfa034e AK |
2076 | /* Don't bother zerocopy for small IO (< 1024) */ |
2077 | if (clnt->trans_mod->zc_request && rsize > 1024) { | |
6e195b0f | 2078 | /* response header len is 11 |
abfa034e AK |
2079 | * PDU Header(7) + IO Size (4) |
2080 | */ | |
4f3b35c1 AV |
2081 | req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, |
2082 | 11, "dqd", fid->fid, offset, rsize); | |
2c66523f | 2083 | } else { |
abfa034e | 2084 | non_zc = 1; |
2c66523f | 2085 | req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, |
abfa034e | 2086 | offset, rsize); |
2c66523f | 2087 | } |
7751bdb3 SK |
2088 | if (IS_ERR(req)) { |
2089 | err = PTR_ERR(req); | |
2090 | goto error; | |
2091 | } | |
2092 | ||
523adb6c | 2093 | err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr); |
7751bdb3 | 2094 | if (err) { |
523adb6c | 2095 | trace_9p_protocol_dump(clnt, &req->rc); |
7751bdb3 SK |
2096 | goto free_and_error; |
2097 | } | |
71d6ad08 AV |
2098 | if (rsize < count) { |
2099 | pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); | |
2100 | count = rsize; | |
2101 | } | |
7751bdb3 | 2102 | |
5d385153 | 2103 | p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); |
7751bdb3 | 2104 | |
abfa034e | 2105 | if (non_zc) |
7751bdb3 SK |
2106 | memmove(data, dataptr, count); |
2107 | ||
67dd8e44 | 2108 | p9_req_put(clnt, req); |
7751bdb3 SK |
2109 | return count; |
2110 | ||
2111 | free_and_error: | |
67dd8e44 | 2112 | p9_req_put(clnt, req); |
7751bdb3 SK |
2113 | error: |
2114 | return err; | |
2115 | } | |
2116 | EXPORT_SYMBOL(p9_client_readdir); | |
4b43516a | 2117 | |
7880b43b | 2118 | int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, |
6e195b0f | 2119 | dev_t rdev, kgid_t gid, struct p9_qid *qid) |
4b43516a MK |
2120 | { |
2121 | int err; | |
2122 | struct p9_client *clnt; | |
2123 | struct p9_req_t *req; | |
2124 | ||
2125 | err = 0; | |
2126 | clnt = fid->clnt; | |
6e195b0f DM |
2127 | p9_debug(P9_DEBUG_9P, |
2128 | ">>> TMKNOD fid %d name %s mode %d major %d minor %d\n", | |
2129 | fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); | |
f791f7c5 | 2130 | req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, |
6e195b0f | 2131 | MAJOR(rdev), MINOR(rdev), gid); |
4b43516a MK |
2132 | if (IS_ERR(req)) |
2133 | return PTR_ERR(req); | |
2134 | ||
523adb6c | 2135 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); |
4b43516a | 2136 | if (err) { |
523adb6c | 2137 | trace_9p_protocol_dump(clnt, &req->rc); |
4b43516a MK |
2138 | goto error; |
2139 | } | |
6e195b0f DM |
2140 | p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", |
2141 | qid->type, qid->path, qid->version); | |
4b43516a MK |
2142 | |
2143 | error: | |
67dd8e44 | 2144 | p9_req_put(clnt, req); |
4b43516a | 2145 | return err; |
4b43516a MK |
2146 | } |
2147 | EXPORT_SYMBOL(p9_client_mknod_dotl); | |
01a622bd | 2148 | |
7880b43b | 2149 | int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, |
6e195b0f | 2150 | kgid_t gid, struct p9_qid *qid) |
01a622bd MK |
2151 | { |
2152 | int err; | |
2153 | struct p9_client *clnt; | |
2154 | struct p9_req_t *req; | |
2155 | ||
2156 | err = 0; | |
2157 | clnt = fid->clnt; | |
5d385153 | 2158 | p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", |
f791f7c5 | 2159 | fid->fid, name, mode, from_kgid(&init_user_ns, gid)); |
6e195b0f DM |
2160 | req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", |
2161 | fid->fid, name, mode, gid); | |
01a622bd MK |
2162 | if (IS_ERR(req)) |
2163 | return PTR_ERR(req); | |
2164 | ||
523adb6c | 2165 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); |
01a622bd | 2166 | if (err) { |
523adb6c | 2167 | trace_9p_protocol_dump(clnt, &req->rc); |
01a622bd MK |
2168 | goto error; |
2169 | } | |
5d385153 | 2170 | p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, |
6e195b0f | 2171 | qid->path, qid->version); |
01a622bd MK |
2172 | |
2173 | error: | |
67dd8e44 | 2174 | p9_req_put(clnt, req); |
01a622bd | 2175 | return err; |
01a622bd MK |
2176 | } |
2177 | EXPORT_SYMBOL(p9_client_mkdir_dotl); | |
a099027c MK |
2178 | |
2179 | int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) | |
2180 | { | |
2181 | int err; | |
2182 | struct p9_client *clnt; | |
2183 | struct p9_req_t *req; | |
2184 | ||
2185 | err = 0; | |
2186 | clnt = fid->clnt; | |
6e195b0f DM |
2187 | p9_debug(P9_DEBUG_9P, |
2188 | ">>> TLOCK fid %d type %i flags %d start %lld length %lld proc_id %d client_id %s\n", | |
2189 | fid->fid, flock->type, flock->flags, flock->start, | |
2190 | flock->length, flock->proc_id, flock->client_id); | |
a099027c MK |
2191 | |
2192 | req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, | |
6e195b0f DM |
2193 | flock->flags, flock->start, flock->length, |
2194 | flock->proc_id, flock->client_id); | |
a099027c MK |
2195 | |
2196 | if (IS_ERR(req)) | |
2197 | return PTR_ERR(req); | |
2198 | ||
523adb6c | 2199 | err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status); |
a099027c | 2200 | if (err) { |
523adb6c | 2201 | trace_9p_protocol_dump(clnt, &req->rc); |
a099027c MK |
2202 | goto error; |
2203 | } | |
5d385153 | 2204 | p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); |
a099027c | 2205 | error: |
67dd8e44 | 2206 | p9_req_put(clnt, req); |
a099027c | 2207 | return err; |
a099027c MK |
2208 | } |
2209 | EXPORT_SYMBOL(p9_client_lock_dotl); | |
1d769cd1 MK |
2210 | |
2211 | int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) | |
2212 | { | |
2213 | int err; | |
2214 | struct p9_client *clnt; | |
2215 | struct p9_req_t *req; | |
2216 | ||
2217 | err = 0; | |
2218 | clnt = fid->clnt; | |
6e195b0f DM |
2219 | p9_debug(P9_DEBUG_9P, |
2220 | ">>> TGETLOCK fid %d, type %i start %lld length %lld proc_id %d client_id %s\n", | |
2221 | fid->fid, glock->type, glock->start, glock->length, | |
2222 | glock->proc_id, glock->client_id); | |
1d769cd1 | 2223 | |
6e195b0f DM |
2224 | req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, |
2225 | glock->type, glock->start, glock->length, | |
2226 | glock->proc_id, glock->client_id); | |
1d769cd1 MK |
2227 | |
2228 | if (IS_ERR(req)) | |
2229 | return PTR_ERR(req); | |
2230 | ||
523adb6c DM |
2231 | err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type, |
2232 | &glock->start, &glock->length, &glock->proc_id, | |
2233 | &glock->client_id); | |
1d769cd1 | 2234 | if (err) { |
523adb6c | 2235 | trace_9p_protocol_dump(clnt, &req->rc); |
1d769cd1 MK |
2236 | goto error; |
2237 | } | |
6e195b0f DM |
2238 | p9_debug(P9_DEBUG_9P, |
2239 | "<<< RGETLOCK type %i start %lld length %lld proc_id %d client_id %s\n", | |
2240 | glock->type, glock->start, glock->length, | |
2241 | glock->proc_id, glock->client_id); | |
1d769cd1 | 2242 | error: |
67dd8e44 | 2243 | p9_req_put(clnt, req); |
1d769cd1 MK |
2244 | return err; |
2245 | } | |
2246 | EXPORT_SYMBOL(p9_client_getlock_dotl); | |
329176cc MK |
2247 | |
2248 | int p9_client_readlink(struct p9_fid *fid, char **target) | |
2249 | { | |
2250 | int err; | |
2251 | struct p9_client *clnt; | |
2252 | struct p9_req_t *req; | |
2253 | ||
2254 | err = 0; | |
2255 | clnt = fid->clnt; | |
5d385153 | 2256 | p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); |
329176cc MK |
2257 | |
2258 | req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); | |
2259 | if (IS_ERR(req)) | |
2260 | return PTR_ERR(req); | |
2261 | ||
523adb6c | 2262 | err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target); |
329176cc | 2263 | if (err) { |
523adb6c | 2264 | trace_9p_protocol_dump(clnt, &req->rc); |
329176cc MK |
2265 | goto error; |
2266 | } | |
5d385153 | 2267 | p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); |
329176cc | 2268 | error: |
67dd8e44 | 2269 | p9_req_put(clnt, req); |
329176cc MK |
2270 | return err; |
2271 | } | |
2272 | EXPORT_SYMBOL(p9_client_readlink); | |
996d5b4d MW |
2273 | |
2274 | int __init p9_client_init(void) | |
2275 | { | |
728356de | 2276 | p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); |
996d5b4d MW |
2277 | return p9_req_cache ? 0 : -ENOMEM; |
2278 | } | |
2279 | ||
2280 | void __exit p9_client_exit(void) | |
2281 | { | |
2282 | kmem_cache_destroy(p9_req_cache); | |
2283 | } |