Commit | Line | Data |
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bd238fb4 LI |
1 | /* |
2 | * net/9p/clnt.c | |
3 | * | |
4 | * 9P Client | |
5 | * | |
8a0dc95f | 6 | * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com> |
bd238fb4 LI |
7 | * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net> |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 | |
11 | * as published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to: | |
20 | * Free Software Foundation | |
21 | * 51 Franklin Street, Fifth Floor | |
22 | * Boston, MA 02111-1301 USA | |
23 | * | |
24 | */ | |
25 | ||
5d385153 JP |
26 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
27 | ||
bd238fb4 LI |
28 | #include <linux/module.h> |
29 | #include <linux/errno.h> | |
30 | #include <linux/fs.h> | |
8a0dc95f | 31 | #include <linux/poll.h> |
bd238fb4 LI |
32 | #include <linux/idr.h> |
33 | #include <linux/mutex.h> | |
5a0e3ad6 | 34 | #include <linux/slab.h> |
3f07c014 | 35 | #include <linux/sched/signal.h> |
bd238fb4 | 36 | #include <linux/uaccess.h> |
4f3b35c1 | 37 | #include <linux/uio.h> |
bd238fb4 | 38 | #include <net/9p/9p.h> |
fb0466c3 | 39 | #include <linux/parser.h> |
c4fac910 | 40 | #include <linux/seq_file.h> |
bd238fb4 | 41 | #include <net/9p/client.h> |
8b81ef58 | 42 | #include <net/9p/transport.h> |
51a87c55 | 43 | #include "protocol.h" |
bd238fb4 | 44 | |
348b5901 AK |
45 | #define CREATE_TRACE_POINTS |
46 | #include <trace/events/9p.h> | |
47 | ||
8a0dc95f EVH |
48 | /* |
49 | * Client Option Parsing (code inspired by NFS code) | |
50 | * - a little lazy - parse all client options | |
51 | */ | |
52 | ||
53 | enum { | |
54 | Opt_msize, | |
55 | Opt_trans, | |
56 | Opt_legacy, | |
0fb80abd | 57 | Opt_version, |
8a0dc95f EVH |
58 | Opt_err, |
59 | }; | |
60 | ||
a447c093 | 61 | static const match_table_t tokens = { |
8a0dc95f EVH |
62 | {Opt_msize, "msize=%u"}, |
63 | {Opt_legacy, "noextend"}, | |
64 | {Opt_trans, "trans=%s"}, | |
0fb80abd | 65 | {Opt_version, "version=%s"}, |
8a0dc95f EVH |
66 | {Opt_err, NULL}, |
67 | }; | |
68 | ||
342fee1d SK |
69 | inline int p9_is_proto_dotl(struct p9_client *clnt) |
70 | { | |
a02cec21 | 71 | return clnt->proto_version == p9_proto_2000L; |
342fee1d SK |
72 | } |
73 | EXPORT_SYMBOL(p9_is_proto_dotl); | |
74 | ||
75 | inline int p9_is_proto_dotu(struct p9_client *clnt) | |
76 | { | |
a02cec21 | 77 | return clnt->proto_version == p9_proto_2000u; |
342fee1d SK |
78 | } |
79 | EXPORT_SYMBOL(p9_is_proto_dotu); | |
80 | ||
c4fac910 DH |
81 | int p9_show_client_options(struct seq_file *m, struct p9_client *clnt) |
82 | { | |
83 | if (clnt->msize != 8192) | |
84 | seq_printf(m, ",msize=%u", clnt->msize); | |
61b272c3 | 85 | seq_printf(m, ",trans=%s", clnt->trans_mod->name); |
c4fac910 DH |
86 | |
87 | switch (clnt->proto_version) { | |
88 | case p9_proto_legacy: | |
89 | seq_puts(m, ",noextend"); | |
90 | break; | |
91 | case p9_proto_2000u: | |
92 | seq_puts(m, ",version=9p2000.u"); | |
93 | break; | |
94 | case p9_proto_2000L: | |
95 | /* Default */ | |
96 | break; | |
97 | } | |
98 | ||
99 | if (clnt->trans_mod->show_options) | |
100 | return clnt->trans_mod->show_options(m, clnt); | |
101 | return 0; | |
102 | } | |
103 | EXPORT_SYMBOL(p9_show_client_options); | |
104 | ||
43def35c SD |
105 | /* |
106 | * Some error codes are taken directly from the server replies, | |
107 | * make sure they are valid. | |
108 | */ | |
109 | static int safe_errno(int err) | |
110 | { | |
111 | if ((err > 0) || (err < -MAX_ERRNO)) { | |
112 | p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err); | |
113 | return -EPROTO; | |
114 | } | |
115 | return err; | |
116 | } | |
117 | ||
118 | ||
0fb80abd | 119 | /* Interpret mount option for protocol version */ |
4d63055f | 120 | static int get_protocol_version(char *s) |
0fb80abd | 121 | { |
3dc9fef6 DC |
122 | int version = -EINVAL; |
123 | ||
4d63055f | 124 | if (!strcmp(s, "9p2000")) { |
0fb80abd | 125 | version = p9_proto_legacy; |
5d385153 | 126 | p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n"); |
4d63055f | 127 | } else if (!strcmp(s, "9p2000.u")) { |
0fb80abd | 128 | version = p9_proto_2000u; |
5d385153 | 129 | p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n"); |
4d63055f | 130 | } else if (!strcmp(s, "9p2000.L")) { |
45bc21ed | 131 | version = p9_proto_2000L; |
5d385153 | 132 | p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n"); |
4d63055f | 133 | } else |
5d385153 | 134 | pr_info("Unknown protocol version %s\n", s); |
4d63055f | 135 | |
0fb80abd SK |
136 | return version; |
137 | } | |
138 | ||
8a0dc95f | 139 | /** |
0e15597e AK |
140 | * parse_options - parse mount options into client structure |
141 | * @opts: options string passed from mount | |
142 | * @clnt: existing v9fs client information | |
8a0dc95f | 143 | * |
bb8ffdfc | 144 | * Return 0 upon success, -ERRNO upon failure |
8a0dc95f EVH |
145 | */ |
146 | ||
bb8ffdfc | 147 | static int parse_opts(char *opts, struct p9_client *clnt) |
8a0dc95f | 148 | { |
d8c8a9e3 | 149 | char *options, *tmp_options; |
8a0dc95f EVH |
150 | char *p; |
151 | substring_t args[MAX_OPT_ARGS]; | |
152 | int option; | |
4d63055f | 153 | char *s; |
bb8ffdfc | 154 | int ret = 0; |
8a0dc95f | 155 | |
095e7999 | 156 | clnt->proto_version = p9_proto_2000L; |
8a0dc95f EVH |
157 | clnt->msize = 8192; |
158 | ||
bb8ffdfc EVH |
159 | if (!opts) |
160 | return 0; | |
161 | ||
d8c8a9e3 EVH |
162 | tmp_options = kstrdup(opts, GFP_KERNEL); |
163 | if (!tmp_options) { | |
5d385153 JP |
164 | p9_debug(P9_DEBUG_ERROR, |
165 | "failed to allocate copy of option string\n"); | |
bb8ffdfc EVH |
166 | return -ENOMEM; |
167 | } | |
d8c8a9e3 | 168 | options = tmp_options; |
8a0dc95f EVH |
169 | |
170 | while ((p = strsep(&options, ",")) != NULL) { | |
4d5077f1 | 171 | int token, r; |
8a0dc95f EVH |
172 | if (!*p) |
173 | continue; | |
174 | token = match_token(p, tokens, args); | |
4d5077f1 AK |
175 | switch (token) { |
176 | case Opt_msize: | |
177 | r = match_int(&args[0], &option); | |
bb8ffdfc | 178 | if (r < 0) { |
5d385153 JP |
179 | p9_debug(P9_DEBUG_ERROR, |
180 | "integer field, but no integer?\n"); | |
bb8ffdfc | 181 | ret = r; |
8a0dc95f EVH |
182 | continue; |
183 | } | |
8a0dc95f EVH |
184 | clnt->msize = option; |
185 | break; | |
186 | case Opt_trans: | |
4d63055f PK |
187 | s = match_strdup(&args[0]); |
188 | if (!s) { | |
189 | ret = -ENOMEM; | |
5d385153 JP |
190 | p9_debug(P9_DEBUG_ERROR, |
191 | "problem allocating copy of trans arg\n"); | |
4d63055f | 192 | goto free_and_return; |
9421c3e6 CX |
193 | } |
194 | ||
195 | v9fs_put_trans(clnt->trans_mod); | |
4d63055f PK |
196 | clnt->trans_mod = v9fs_get_trans_by_name(s); |
197 | if (clnt->trans_mod == NULL) { | |
5d385153 JP |
198 | pr_info("Could not find request transport: %s\n", |
199 | s); | |
349d3bb8 | 200 | ret = -EINVAL; |
349d3bb8 | 201 | } |
4d63055f | 202 | kfree(s); |
8a0dc95f EVH |
203 | break; |
204 | case Opt_legacy: | |
342fee1d | 205 | clnt->proto_version = p9_proto_legacy; |
8a0dc95f | 206 | break; |
0fb80abd | 207 | case Opt_version: |
4d63055f PK |
208 | s = match_strdup(&args[0]); |
209 | if (!s) { | |
210 | ret = -ENOMEM; | |
5d385153 JP |
211 | p9_debug(P9_DEBUG_ERROR, |
212 | "problem allocating copy of version arg\n"); | |
0fb80abd | 213 | goto free_and_return; |
4d63055f | 214 | } |
8d856c72 CX |
215 | r = get_protocol_version(s); |
216 | if (r < 0) | |
217 | ret = r; | |
218 | else | |
219 | clnt->proto_version = r; | |
4d63055f | 220 | kfree(s); |
0fb80abd | 221 | break; |
8a0dc95f EVH |
222 | default: |
223 | continue; | |
224 | } | |
225 | } | |
72029fe8 | 226 | |
349d3bb8 | 227 | free_and_return: |
c290fba8 | 228 | if (ret) |
229 | v9fs_put_trans(clnt->trans_mod); | |
d8c8a9e3 | 230 | kfree(tmp_options); |
bb8ffdfc | 231 | return ret; |
8a0dc95f EVH |
232 | } |
233 | ||
91a76be3 DM |
234 | static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc, |
235 | int alloc_msize) | |
5387320d | 236 | { |
91a76be3 DM |
237 | if (likely(c->fcall_cache) && alloc_msize == c->msize) { |
238 | fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS); | |
239 | fc->cache = c->fcall_cache; | |
240 | } else { | |
241 | fc->sdata = kmalloc(alloc_msize, GFP_NOFS); | |
242 | fc->cache = NULL; | |
243 | } | |
523adb6c DM |
244 | if (!fc->sdata) |
245 | return -ENOMEM; | |
5387320d | 246 | fc->capacity = alloc_msize; |
523adb6c DM |
247 | return 0; |
248 | } | |
249 | ||
250 | void p9_fcall_fini(struct p9_fcall *fc) | |
251 | { | |
91a76be3 DM |
252 | /* sdata can be NULL for interrupted requests in trans_rdma, |
253 | * and kmem_cache_free does not do NULL-check for us | |
254 | */ | |
255 | if (unlikely(!fc->sdata)) | |
256 | return; | |
257 | ||
258 | if (fc->cache) | |
259 | kmem_cache_free(fc->cache, fc->sdata); | |
260 | else | |
261 | kfree(fc->sdata); | |
5387320d | 262 | } |
523adb6c | 263 | EXPORT_SYMBOL(p9_fcall_fini); |
5387320d | 264 | |
996d5b4d MW |
265 | static struct kmem_cache *p9_req_cache; |
266 | ||
fea511a6 | 267 | /** |
996d5b4d MW |
268 | * p9_req_alloc - Allocate a new request. |
269 | * @c: Client session. | |
270 | * @type: Transaction type. | |
271 | * @max_size: Maximum packet size for this request. | |
fea511a6 | 272 | * |
996d5b4d MW |
273 | * Context: Process context. |
274 | * Return: Pointer to new request. | |
fea511a6 | 275 | */ |
ef6b0807 | 276 | static struct p9_req_t * |
996d5b4d | 277 | p9_tag_alloc(struct p9_client *c, int8_t type, unsigned int max_size) |
fea511a6 | 278 | { |
996d5b4d | 279 | struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS); |
abfa034e | 280 | int alloc_msize = min(c->msize, max_size); |
996d5b4d | 281 | int tag; |
fea511a6 | 282 | |
996d5b4d | 283 | if (!req) |
72ea0321 | 284 | return ERR_PTR(-ENOMEM); |
fea511a6 | 285 | |
91a76be3 | 286 | if (p9_fcall_init(c, &req->tc, alloc_msize)) |
523adb6c | 287 | goto free_req; |
91a76be3 | 288 | if (p9_fcall_init(c, &req->rc, alloc_msize)) |
996d5b4d | 289 | goto free; |
51a87c55 | 290 | |
523adb6c DM |
291 | p9pdu_reset(&req->tc); |
292 | p9pdu_reset(&req->rc); | |
51a87c55 | 293 | req->status = REQ_STATUS_ALLOC; |
996d5b4d MW |
294 | init_waitqueue_head(&req->wq); |
295 | INIT_LIST_HEAD(&req->req_list); | |
296 | ||
297 | idr_preload(GFP_NOFS); | |
298 | spin_lock_irq(&c->lock); | |
299 | if (type == P9_TVERSION) | |
300 | tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1, | |
301 | GFP_NOWAIT); | |
302 | else | |
303 | tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT); | |
523adb6c | 304 | req->tc.tag = tag; |
996d5b4d MW |
305 | spin_unlock_irq(&c->lock); |
306 | idr_preload_end(); | |
307 | if (tag < 0) | |
308 | goto free; | |
fea511a6 | 309 | |
728356de TB |
310 | /* Init ref to two because in the general case there is one ref |
311 | * that is put asynchronously by a writer thread, one ref | |
312 | * temporarily given by p9_tag_lookup and put by p9_client_cb | |
313 | * in the recv thread, and one ref put by p9_tag_remove in the | |
314 | * main thread. The only exception is virtio that does not use | |
315 | * p9_tag_lookup but does not have a writer thread either | |
316 | * (the write happens synchronously in the request/zc_request | |
317 | * callback), so p9_client_cb eats the second ref there | |
318 | * as the pointer is duplicated directly by virtqueue_add_sgs() | |
319 | */ | |
320 | refcount_set(&req->refcount.refcount, 2); | |
321 | ||
ea071aa1 SD |
322 | return req; |
323 | ||
996d5b4d | 324 | free: |
523adb6c DM |
325 | p9_fcall_fini(&req->tc); |
326 | p9_fcall_fini(&req->rc); | |
327 | free_req: | |
996d5b4d | 328 | kmem_cache_free(p9_req_cache, req); |
ea071aa1 | 329 | return ERR_PTR(-ENOMEM); |
fea511a6 | 330 | } |
fea511a6 EVH |
331 | |
332 | /** | |
996d5b4d MW |
333 | * p9_tag_lookup - Look up a request by tag. |
334 | * @c: Client session. | |
335 | * @tag: Transaction ID. | |
fea511a6 | 336 | * |
996d5b4d MW |
337 | * Context: Any context. |
338 | * Return: A request, or %NULL if there is no request with that tag. | |
fea511a6 | 339 | */ |
fea511a6 EVH |
340 | struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) |
341 | { | |
996d5b4d | 342 | struct p9_req_t *req; |
fea511a6 | 343 | |
996d5b4d | 344 | rcu_read_lock(); |
728356de | 345 | again: |
996d5b4d | 346 | req = idr_find(&c->reqs, tag); |
728356de TB |
347 | if (req) { |
348 | /* We have to be careful with the req found under rcu_read_lock | |
349 | * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the | |
350 | * ref again without corrupting other data, then check again | |
351 | * that the tag matches once we have the ref | |
352 | */ | |
353 | if (!p9_req_try_get(req)) | |
354 | goto again; | |
355 | if (req->tc.tag != tag) { | |
356 | p9_req_put(req); | |
357 | goto again; | |
358 | } | |
359 | } | |
996d5b4d | 360 | rcu_read_unlock(); |
fea511a6 | 361 | |
996d5b4d | 362 | return req; |
fea511a6 EVH |
363 | } |
364 | EXPORT_SYMBOL(p9_tag_lookup); | |
365 | ||
366 | /** | |
43cbcbee | 367 | * p9_tag_remove - Remove a tag. |
996d5b4d | 368 | * @c: Client session. |
43cbcbee | 369 | * @r: Request of reference. |
fea511a6 | 370 | * |
996d5b4d | 371 | * Context: Any context. |
fea511a6 | 372 | */ |
728356de | 373 | static int p9_tag_remove(struct p9_client *c, struct p9_req_t *r) |
fea511a6 | 374 | { |
996d5b4d | 375 | unsigned long flags; |
523adb6c | 376 | u16 tag = r->tc.tag; |
fea511a6 | 377 | |
996d5b4d MW |
378 | p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag); |
379 | spin_lock_irqsave(&c->lock, flags); | |
380 | idr_remove(&c->reqs, tag); | |
381 | spin_unlock_irqrestore(&c->lock, flags); | |
728356de TB |
382 | return p9_req_put(r); |
383 | } | |
384 | ||
385 | static void p9_req_free(struct kref *ref) | |
386 | { | |
387 | struct p9_req_t *r = container_of(ref, struct p9_req_t, refcount); | |
523adb6c DM |
388 | p9_fcall_fini(&r->tc); |
389 | p9_fcall_fini(&r->rc); | |
996d5b4d | 390 | kmem_cache_free(p9_req_cache, r); |
fea511a6 EVH |
391 | } |
392 | ||
728356de TB |
393 | int p9_req_put(struct p9_req_t *r) |
394 | { | |
395 | return kref_put(&r->refcount, p9_req_free); | |
396 | } | |
397 | EXPORT_SYMBOL(p9_req_put); | |
398 | ||
fea511a6 EVH |
399 | /** |
400 | * p9_tag_cleanup - cleans up tags structure and reclaims resources | |
0e15597e | 401 | * @c: v9fs client struct |
fea511a6 EVH |
402 | * |
403 | * This frees resources associated with the tags structure | |
404 | * | |
405 | */ | |
406 | static void p9_tag_cleanup(struct p9_client *c) | |
407 | { | |
996d5b4d MW |
408 | struct p9_req_t *req; |
409 | int id; | |
fea511a6 | 410 | |
996d5b4d MW |
411 | rcu_read_lock(); |
412 | idr_for_each_entry(&c->reqs, req, id) { | |
413 | pr_info("Tag %d still in use\n", id); | |
728356de TB |
414 | if (p9_tag_remove(c, req) == 0) |
415 | pr_warn("Packet with tag %d has still references", | |
416 | req->tc.tag); | |
fea511a6 | 417 | } |
996d5b4d | 418 | rcu_read_unlock(); |
673d62cd EVH |
419 | } |
420 | ||
91b8534f EVH |
421 | /** |
422 | * p9_client_cb - call back from transport to client | |
423 | * c: client state | |
424 | * req: request received | |
425 | * | |
426 | */ | |
2b6e72ed | 427 | void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) |
91b8534f | 428 | { |
523adb6c | 429 | p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag); |
2b6e72ed DM |
430 | |
431 | /* | |
432 | * This barrier is needed to make sure any change made to req before | |
2d58f63f | 433 | * the status change is visible to another thread |
2b6e72ed DM |
434 | */ |
435 | smp_wmb(); | |
436 | req->status = status; | |
437 | ||
2557d0c5 | 438 | wake_up(&req->wq); |
523adb6c | 439 | p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag); |
728356de | 440 | p9_req_put(req); |
91b8534f EVH |
441 | } |
442 | EXPORT_SYMBOL(p9_client_cb); | |
443 | ||
51a87c55 EVH |
444 | /** |
445 | * p9_parse_header - parse header arguments out of a packet | |
446 | * @pdu: packet to parse | |
447 | * @size: size of packet | |
448 | * @type: type of request | |
449 | * @tag: tag of packet | |
450 | * @rewind: set if we need to rewind offset afterwards | |
451 | */ | |
452 | ||
453 | int | |
454 | p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag, | |
455 | int rewind) | |
456 | { | |
457 | int8_t r_type; | |
458 | int16_t r_tag; | |
459 | int32_t r_size; | |
460 | int offset = pdu->offset; | |
461 | int err; | |
462 | ||
463 | pdu->offset = 0; | |
51a87c55 EVH |
464 | |
465 | err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); | |
466 | if (err) | |
467 | goto rewind_and_exit; | |
468 | ||
51a87c55 EVH |
469 | if (type) |
470 | *type = r_type; | |
471 | if (tag) | |
472 | *tag = r_tag; | |
473 | if (size) | |
474 | *size = r_size; | |
475 | ||
f984579a TB |
476 | if (pdu->size != r_size || r_size < 7) { |
477 | err = -EINVAL; | |
478 | goto rewind_and_exit; | |
479 | } | |
480 | ||
481 | pdu->id = r_type; | |
482 | pdu->tag = r_tag; | |
483 | ||
484 | p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", | |
485 | pdu->size, pdu->id, pdu->tag); | |
51a87c55 EVH |
486 | |
487 | rewind_and_exit: | |
488 | if (rewind) | |
489 | pdu->offset = offset; | |
490 | return err; | |
491 | } | |
492 | EXPORT_SYMBOL(p9_parse_header); | |
493 | ||
494 | /** | |
495 | * p9_check_errors - check 9p packet for error return and process it | |
496 | * @c: current client instance | |
497 | * @req: request to parse and check for error conditions | |
498 | * | |
499 | * returns error code if one is discovered, otherwise returns 0 | |
500 | * | |
501 | * this will have to be more complicated if we have multiple | |
502 | * error packet types | |
503 | */ | |
504 | ||
505 | static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) | |
506 | { | |
507 | int8_t type; | |
508 | int err; | |
ca41bb3e | 509 | int ecode; |
51a87c55 | 510 | |
523adb6c DM |
511 | err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); |
512 | if (req->rc.size >= c->msize) { | |
f984579a TB |
513 | p9_debug(P9_DEBUG_ERROR, |
514 | "requested packet size too big: %d\n", | |
523adb6c | 515 | req->rc.size); |
f984579a TB |
516 | return -EIO; |
517 | } | |
348b5901 AK |
518 | /* |
519 | * dump the response from server | |
520 | * This should be after check errors which poplulate pdu_fcall. | |
521 | */ | |
523adb6c | 522 | trace_9p_protocol_dump(c, &req->rc); |
51a87c55 | 523 | if (err) { |
5d385153 | 524 | p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); |
51a87c55 EVH |
525 | return err; |
526 | } | |
ca41bb3e VJJ |
527 | if (type != P9_RERROR && type != P9_RLERROR) |
528 | return 0; | |
4f7ebe80 | 529 | |
ca41bb3e VJJ |
530 | if (!p9_is_proto_dotl(c)) { |
531 | char *ename; | |
523adb6c | 532 | err = p9pdu_readf(&req->rc, c->proto_version, "s?d", |
abfa034e | 533 | &ename, &ecode); |
ca41bb3e VJJ |
534 | if (err) |
535 | goto out_err; | |
4f7ebe80 | 536 | |
287980e4 | 537 | if (p9_is_proto_dotu(c) && ecode < 512) |
ca41bb3e | 538 | err = -ecode; |
4f7ebe80 | 539 | |
287980e4 | 540 | if (!err) { |
ca41bb3e | 541 | err = p9_errstr2errno(ename, strlen(ename)); |
4f7ebe80 | 542 | |
5d385153 JP |
543 | p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", |
544 | -ecode, ename); | |
4f7ebe80 | 545 | } |
abfa034e | 546 | kfree(ename); |
ca41bb3e | 547 | } else { |
523adb6c | 548 | err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); |
ca41bb3e VJJ |
549 | err = -ecode; |
550 | ||
5d385153 | 551 | p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); |
ca41bb3e | 552 | } |
51a87c55 | 553 | |
51a87c55 | 554 | return err; |
4f7ebe80 AB |
555 | |
556 | out_err: | |
5d385153 | 557 | p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); |
4f7ebe80 AB |
558 | |
559 | return err; | |
51a87c55 EVH |
560 | } |
561 | ||
abfa034e AK |
562 | /** |
563 | * p9_check_zc_errors - check 9p packet for error return and process it | |
564 | * @c: current client instance | |
565 | * @req: request to parse and check for error conditions | |
566 | * @in_hdrlen: Size of response protocol buffer. | |
567 | * | |
568 | * returns error code if one is discovered, otherwise returns 0 | |
569 | * | |
570 | * this will have to be more complicated if we have multiple | |
571 | * error packet types | |
572 | */ | |
573 | ||
574 | static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req, | |
4f3b35c1 | 575 | struct iov_iter *uidata, int in_hdrlen) |
abfa034e AK |
576 | { |
577 | int err; | |
578 | int ecode; | |
579 | int8_t type; | |
580 | char *ename = NULL; | |
581 | ||
523adb6c | 582 | err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); |
348b5901 AK |
583 | /* |
584 | * dump the response from server | |
585 | * This should be after parse_header which poplulate pdu_fcall. | |
586 | */ | |
523adb6c | 587 | trace_9p_protocol_dump(c, &req->rc); |
abfa034e | 588 | if (err) { |
5d385153 | 589 | p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); |
abfa034e AK |
590 | return err; |
591 | } | |
592 | ||
593 | if (type != P9_RERROR && type != P9_RLERROR) | |
594 | return 0; | |
595 | ||
596 | if (!p9_is_proto_dotl(c)) { | |
597 | /* Error is reported in string format */ | |
42fe6484 AK |
598 | int len; |
599 | /* 7 = header size for RERROR; */ | |
600 | int inline_len = in_hdrlen - 7; | |
abfa034e | 601 | |
523adb6c | 602 | len = req->rc.size - req->rc.offset; |
42fe6484 AK |
603 | if (len > (P9_ZC_HDR_SZ - 7)) { |
604 | err = -EFAULT; | |
abfa034e AK |
605 | goto out_err; |
606 | } | |
abfa034e | 607 | |
523adb6c | 608 | ename = &req->rc.sdata[req->rc.offset]; |
42fe6484 AK |
609 | if (len > inline_len) { |
610 | /* We have error in external buffer */ | |
1c512a7c AV |
611 | if (!copy_from_iter_full(ename + inline_len, |
612 | len - inline_len, uidata)) { | |
4f3b35c1 AV |
613 | err = -EFAULT; |
614 | goto out_err; | |
abfa034e AK |
615 | } |
616 | } | |
42fe6484 | 617 | ename = NULL; |
523adb6c | 618 | err = p9pdu_readf(&req->rc, c->proto_version, "s?d", |
42fe6484 AK |
619 | &ename, &ecode); |
620 | if (err) | |
621 | goto out_err; | |
622 | ||
287980e4 | 623 | if (p9_is_proto_dotu(c) && ecode < 512) |
abfa034e | 624 | err = -ecode; |
42fe6484 | 625 | |
287980e4 | 626 | if (!err) { |
abfa034e AK |
627 | err = p9_errstr2errno(ename, strlen(ename)); |
628 | ||
5d385153 JP |
629 | p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", |
630 | -ecode, ename); | |
abfa034e AK |
631 | } |
632 | kfree(ename); | |
633 | } else { | |
523adb6c | 634 | err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); |
abfa034e AK |
635 | err = -ecode; |
636 | ||
5d385153 | 637 | p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); |
abfa034e AK |
638 | } |
639 | return err; | |
640 | ||
abfa034e | 641 | out_err: |
5d385153 | 642 | p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); |
abfa034e AK |
643 | return err; |
644 | } | |
645 | ||
aca00763 RL |
646 | static struct p9_req_t * |
647 | p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); | |
648 | ||
51a87c55 EVH |
649 | /** |
650 | * p9_client_flush - flush (cancel) a request | |
0e15597e AK |
651 | * @c: client state |
652 | * @oldreq: request to cancel | |
51a87c55 | 653 | * |
aca00763 | 654 | * This sents a flush for a particular request and links |
51a87c55 EVH |
655 | * the flush request to the original request. The current |
656 | * code only supports a single flush request although the protocol | |
657 | * allows for multiple flush requests to be sent for a single request. | |
658 | * | |
659 | */ | |
660 | ||
661 | static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) | |
662 | { | |
663 | struct p9_req_t *req; | |
664 | int16_t oldtag; | |
665 | int err; | |
666 | ||
523adb6c | 667 | err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1); |
51a87c55 EVH |
668 | if (err) |
669 | return err; | |
670 | ||
5d385153 | 671 | p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); |
51a87c55 EVH |
672 | |
673 | req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); | |
674 | if (IS_ERR(req)) | |
675 | return PTR_ERR(req); | |
676 | ||
1cff3306 SD |
677 | /* |
678 | * if we haven't received a response for oldreq, | |
60ff779c | 679 | * remove it from the list |
1cff3306 | 680 | */ |
728356de | 681 | if (oldreq->status == REQ_STATUS_SENT) { |
afd8d654 SD |
682 | if (c->trans_mod->cancelled) |
683 | c->trans_mod->cancelled(c, oldreq); | |
728356de | 684 | } |
1bab88b2 | 685 | |
43cbcbee | 686 | p9_tag_remove(c, req); |
51a87c55 EVH |
687 | return 0; |
688 | } | |
689 | ||
abfa034e AK |
690 | static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, |
691 | int8_t type, int req_size, | |
692 | const char *fmt, va_list ap) | |
91b8534f | 693 | { |
996d5b4d | 694 | int err; |
91b8534f | 695 | struct p9_req_t *req; |
91b8534f | 696 | |
5d385153 | 697 | p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); |
91b8534f | 698 | |
6d96d3ab AK |
699 | /* we allow for any status other than disconnected */ |
700 | if (c->status == Disconnected) | |
701 | return ERR_PTR(-EIO); | |
702 | ||
703 | /* if status is begin_disconnected we allow only clunk request */ | |
704 | if ((c->status == BeginDisconnect) && (type != P9_TCLUNK)) | |
51a87c55 | 705 | return ERR_PTR(-EIO); |
91b8534f | 706 | |
996d5b4d | 707 | req = p9_tag_alloc(c, type, req_size); |
51a87c55 EVH |
708 | if (IS_ERR(req)) |
709 | return req; | |
91b8534f | 710 | |
51a87c55 | 711 | /* marshall the data */ |
523adb6c DM |
712 | p9pdu_prepare(&req->tc, req->tc.tag, type); |
713 | err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap); | |
7b3bb3fe AK |
714 | if (err) |
715 | goto reterr; | |
523adb6c DM |
716 | p9pdu_finalize(c, &req->tc); |
717 | trace_9p_client_req(c, type, req->tc.tag); | |
abfa034e AK |
718 | return req; |
719 | reterr: | |
43cbcbee | 720 | p9_tag_remove(c, req); |
728356de TB |
721 | /* We have to put also the 2nd reference as it won't be used */ |
722 | p9_req_put(req); | |
abfa034e AK |
723 | return ERR_PTR(err); |
724 | } | |
725 | ||
726 | /** | |
727 | * p9_client_rpc - issue a request and wait for a response | |
728 | * @c: client session | |
729 | * @type: type of request | |
730 | * @fmt: protocol format string (see protocol.c) | |
731 | * | |
43cbcbee | 732 | * Returns request structure (which client must free using p9_tag_remove) |
abfa034e AK |
733 | */ |
734 | ||
735 | static struct p9_req_t * | |
736 | p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) | |
737 | { | |
738 | va_list ap; | |
739 | int sigpending, err; | |
740 | unsigned long flags; | |
741 | struct p9_req_t *req; | |
742 | ||
743 | va_start(ap, fmt); | |
744 | req = p9_client_prepare_req(c, type, c->msize, fmt, ap); | |
745 | va_end(ap); | |
746 | if (IS_ERR(req)) | |
747 | return req; | |
748 | ||
749 | if (signal_pending(current)) { | |
750 | sigpending = 1; | |
751 | clear_thread_flag(TIF_SIGPENDING); | |
752 | } else | |
753 | sigpending = 0; | |
91b8534f EVH |
754 | |
755 | err = c->trans_mod->request(c, req); | |
756 | if (err < 0) { | |
728356de TB |
757 | /* write won't happen */ |
758 | p9_req_put(req); | |
3cd79678 | 759 | if (err != -ERESTARTSYS && err != -EFAULT) |
52f44e0d | 760 | c->status = Disconnected; |
a8522243 | 761 | goto recalc_sigpending; |
91b8534f | 762 | } |
a314f274 | 763 | again: |
abfa034e | 764 | /* Wait for the response */ |
2557d0c5 | 765 | err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD); |
91b8534f | 766 | |
2b6e72ed DM |
767 | /* |
768 | * Make sure our req is coherent with regard to updates in other | |
769 | * threads - echoes to wmb() in the callback | |
770 | */ | |
771 | smp_rmb(); | |
772 | ||
a314f274 JG |
773 | if ((err == -ERESTARTSYS) && (c->status == Connected) |
774 | && (type == P9_TFLUSH)) { | |
775 | sigpending = 1; | |
776 | clear_thread_flag(TIF_SIGPENDING); | |
777 | goto again; | |
778 | } | |
779 | ||
91b8534f | 780 | if (req->status == REQ_STATUS_ERROR) { |
5d385153 | 781 | p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); |
91b8534f | 782 | err = req->t_err; |
91b8534f | 783 | } |
1bab88b2 | 784 | if ((err == -ERESTARTSYS) && (c->status == Connected)) { |
5d385153 | 785 | p9_debug(P9_DEBUG_MUX, "flushing\n"); |
91b8534f | 786 | sigpending = 1; |
91b8534f EVH |
787 | clear_thread_flag(TIF_SIGPENDING); |
788 | ||
1bab88b2 LI |
789 | if (c->trans_mod->cancel(c, req)) |
790 | p9_client_flush(c, req); | |
791 | ||
792 | /* if we received the response anyway, don't signal error */ | |
793 | if (req->status == REQ_STATUS_RCVD) | |
794 | err = 0; | |
91b8534f | 795 | } |
a8522243 | 796 | recalc_sigpending: |
91b8534f EVH |
797 | if (sigpending) { |
798 | spin_lock_irqsave(¤t->sighand->siglock, flags); | |
799 | recalc_sigpending(); | |
800 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); | |
801 | } | |
91b8534f EVH |
802 | if (err < 0) |
803 | goto reterr; | |
804 | ||
51a87c55 | 805 | err = p9_check_errors(c, req); |
523adb6c | 806 | trace_9p_client_res(c, type, req->rc.tag, err); |
348b5901 | 807 | if (!err) |
51a87c55 | 808 | return req; |
abfa034e | 809 | reterr: |
43cbcbee | 810 | p9_tag_remove(c, req); |
43def35c | 811 | return ERR_PTR(safe_errno(err)); |
abfa034e AK |
812 | } |
813 | ||
814 | /** | |
815 | * p9_client_zc_rpc - issue a request and wait for a response | |
816 | * @c: client session | |
817 | * @type: type of request | |
4f3b35c1 AV |
818 | * @uidata: destination for zero copy read |
819 | * @uodata: source for zero copy write | |
abfa034e AK |
820 | * @inlen: read buffer size |
821 | * @olen: write buffer size | |
822 | * @hdrlen: reader header size, This is the size of response protocol data | |
823 | * @fmt: protocol format string (see protocol.c) | |
824 | * | |
43cbcbee | 825 | * Returns request structure (which client must free using p9_tag_remove) |
abfa034e AK |
826 | */ |
827 | static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, | |
4f3b35c1 AV |
828 | struct iov_iter *uidata, |
829 | struct iov_iter *uodata, | |
abfa034e | 830 | int inlen, int olen, int in_hdrlen, |
4f3b35c1 | 831 | const char *fmt, ...) |
abfa034e AK |
832 | { |
833 | va_list ap; | |
834 | int sigpending, err; | |
835 | unsigned long flags; | |
836 | struct p9_req_t *req; | |
837 | ||
838 | va_start(ap, fmt); | |
839 | /* | |
840 | * We allocate a inline protocol data of only 4k bytes. | |
841 | * The actual content is passed in zero-copy fashion. | |
842 | */ | |
843 | req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap); | |
844 | va_end(ap); | |
845 | if (IS_ERR(req)) | |
846 | return req; | |
847 | ||
848 | if (signal_pending(current)) { | |
849 | sigpending = 1; | |
850 | clear_thread_flag(TIF_SIGPENDING); | |
851 | } else | |
852 | sigpending = 0; | |
853 | ||
abfa034e | 854 | err = c->trans_mod->zc_request(c, req, uidata, uodata, |
4f3b35c1 | 855 | inlen, olen, in_hdrlen); |
abfa034e AK |
856 | if (err < 0) { |
857 | if (err == -EIO) | |
858 | c->status = Disconnected; | |
a84b69cb | 859 | if (err != -ERESTARTSYS) |
a8522243 | 860 | goto recalc_sigpending; |
abfa034e AK |
861 | } |
862 | if (req->status == REQ_STATUS_ERROR) { | |
5d385153 | 863 | p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); |
abfa034e AK |
864 | err = req->t_err; |
865 | } | |
866 | if ((err == -ERESTARTSYS) && (c->status == Connected)) { | |
5d385153 | 867 | p9_debug(P9_DEBUG_MUX, "flushing\n"); |
abfa034e AK |
868 | sigpending = 1; |
869 | clear_thread_flag(TIF_SIGPENDING); | |
91b8534f | 870 | |
abfa034e AK |
871 | if (c->trans_mod->cancel(c, req)) |
872 | p9_client_flush(c, req); | |
873 | ||
874 | /* if we received the response anyway, don't signal error */ | |
875 | if (req->status == REQ_STATUS_RCVD) | |
876 | err = 0; | |
877 | } | |
a8522243 | 878 | recalc_sigpending: |
abfa034e AK |
879 | if (sigpending) { |
880 | spin_lock_irqsave(¤t->sighand->siglock, flags); | |
881 | recalc_sigpending(); | |
882 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); | |
883 | } | |
884 | if (err < 0) | |
885 | goto reterr; | |
886 | ||
4f3b35c1 | 887 | err = p9_check_zc_errors(c, req, uidata, in_hdrlen); |
523adb6c | 888 | trace_9p_client_res(c, type, req->rc.tag, err); |
348b5901 | 889 | if (!err) |
abfa034e | 890 | return req; |
91b8534f | 891 | reterr: |
43cbcbee | 892 | p9_tag_remove(c, req); |
43def35c | 893 | return ERR_PTR(safe_errno(err)); |
91b8534f EVH |
894 | } |
895 | ||
5503ac56 EVH |
896 | static struct p9_fid *p9_fid_create(struct p9_client *clnt) |
897 | { | |
9f3e9bbe | 898 | int ret; |
5503ac56 EVH |
899 | struct p9_fid *fid; |
900 | ||
5d385153 | 901 | p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); |
5503ac56 EVH |
902 | fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); |
903 | if (!fid) | |
b5303be2 | 904 | return NULL; |
5503ac56 | 905 | |
5503ac56 EVH |
906 | memset(&fid->qid, 0, sizeof(struct p9_qid)); |
907 | fid->mode = -1; | |
f8b9d53a | 908 | fid->uid = current_fsuid(); |
5503ac56 | 909 | fid->clnt = clnt; |
3e2796a9 | 910 | fid->rdir = NULL; |
f28cdf04 | 911 | fid->fid = 0; |
5503ac56 | 912 | |
f28cdf04 MW |
913 | idr_preload(GFP_KERNEL); |
914 | spin_lock_irq(&clnt->lock); | |
915 | ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1, | |
916 | GFP_NOWAIT); | |
917 | spin_unlock_irq(&clnt->lock); | |
918 | idr_preload_end(); | |
919 | ||
920 | if (!ret) | |
921 | return fid; | |
5503ac56 | 922 | |
5503ac56 | 923 | kfree(fid); |
b5303be2 | 924 | return NULL; |
5503ac56 EVH |
925 | } |
926 | ||
927 | static void p9_fid_destroy(struct p9_fid *fid) | |
928 | { | |
929 | struct p9_client *clnt; | |
cac23d65 | 930 | unsigned long flags; |
5503ac56 | 931 | |
5d385153 | 932 | p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); |
5503ac56 | 933 | clnt = fid->clnt; |
cac23d65 | 934 | spin_lock_irqsave(&clnt->lock, flags); |
f28cdf04 | 935 | idr_remove(&clnt->fids, fid->fid); |
cac23d65 | 936 | spin_unlock_irqrestore(&clnt->lock, flags); |
3e2796a9 | 937 | kfree(fid->rdir); |
5503ac56 EVH |
938 | kfree(fid); |
939 | } | |
8a0dc95f | 940 | |
32a875ad | 941 | static int p9_client_version(struct p9_client *c) |
bd238fb4 | 942 | { |
6936bf60 | 943 | int err = 0; |
51a87c55 | 944 | struct p9_req_t *req; |
7913690d | 945 | char *version = NULL; |
51a87c55 | 946 | int msize; |
bd238fb4 | 947 | |
5d385153 JP |
948 | p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", |
949 | c->msize, c->proto_version); | |
c5a7697d SK |
950 | |
951 | switch (c->proto_version) { | |
45bc21ed | 952 | case p9_proto_2000L: |
c5a7697d | 953 | req = p9_client_rpc(c, P9_TVERSION, "ds", |
45bc21ed | 954 | c->msize, "9P2000.L"); |
c5a7697d SK |
955 | break; |
956 | case p9_proto_2000u: | |
957 | req = p9_client_rpc(c, P9_TVERSION, "ds", | |
958 | c->msize, "9P2000.u"); | |
959 | break; | |
960 | case p9_proto_legacy: | |
961 | req = p9_client_rpc(c, P9_TVERSION, "ds", | |
962 | c->msize, "9P2000"); | |
963 | break; | |
964 | default: | |
965 | return -EINVAL; | |
c5a7697d SK |
966 | } |
967 | ||
51a87c55 EVH |
968 | if (IS_ERR(req)) |
969 | return PTR_ERR(req); | |
6936bf60 | 970 | |
523adb6c | 971 | err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version); |
51a87c55 | 972 | if (err) { |
5d385153 | 973 | p9_debug(P9_DEBUG_9P, "version error %d\n", err); |
523adb6c | 974 | trace_9p_protocol_dump(c, &req->rc); |
6936bf60 | 975 | goto error; |
51a87c55 | 976 | } |
6936bf60 | 977 | |
5d385153 | 978 | p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); |
45bc21ed SK |
979 | if (!strncmp(version, "9P2000.L", 8)) |
980 | c->proto_version = p9_proto_2000L; | |
c5a7697d | 981 | else if (!strncmp(version, "9P2000.u", 8)) |
342fee1d SK |
982 | c->proto_version = p9_proto_2000u; |
983 | else if (!strncmp(version, "9P2000", 6)) | |
984 | c->proto_version = p9_proto_legacy; | |
6936bf60 EVH |
985 | else { |
986 | err = -EREMOTEIO; | |
987 | goto error; | |
988 | } | |
989 | ||
51a87c55 EVH |
990 | if (msize < c->msize) |
991 | c->msize = msize; | |
6936bf60 EVH |
992 | |
993 | error: | |
51a87c55 | 994 | kfree(version); |
43cbcbee | 995 | p9_tag_remove(c, req); |
6936bf60 EVH |
996 | |
997 | return err; | |
998 | } | |
6936bf60 EVH |
999 | |
1000 | struct p9_client *p9_client_create(const char *dev_name, char *options) | |
1001 | { | |
1002 | int err; | |
1003 | struct p9_client *clnt; | |
50192abe | 1004 | char *client_id; |
6936bf60 EVH |
1005 | |
1006 | err = 0; | |
bd238fb4 LI |
1007 | clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); |
1008 | if (!clnt) | |
1009 | return ERR_PTR(-ENOMEM); | |
1010 | ||
72029fe8 | 1011 | clnt->trans_mod = NULL; |
bb8ffdfc | 1012 | clnt->trans = NULL; |
91a76be3 | 1013 | clnt->fcall_cache = NULL; |
50192abe WD |
1014 | |
1015 | client_id = utsname()->nodename; | |
1016 | memcpy(clnt->name, client_id, strlen(client_id) + 1); | |
1017 | ||
bd238fb4 | 1018 | spin_lock_init(&clnt->lock); |
f28cdf04 | 1019 | idr_init(&clnt->fids); |
996d5b4d | 1020 | idr_init(&clnt->reqs); |
fea511a6 | 1021 | |
bb8ffdfc EVH |
1022 | err = parse_opts(options, clnt); |
1023 | if (err < 0) | |
996d5b4d | 1024 | goto free_client; |
bb8ffdfc | 1025 | |
a17d1720 AK |
1026 | if (!clnt->trans_mod) |
1027 | clnt->trans_mod = v9fs_get_default_trans(); | |
1028 | ||
8a0dc95f EVH |
1029 | if (clnt->trans_mod == NULL) { |
1030 | err = -EPROTONOSUPPORT; | |
5d385153 JP |
1031 | p9_debug(P9_DEBUG_ERROR, |
1032 | "No transport defined or default transport\n"); | |
996d5b4d | 1033 | goto free_client; |
8781ff94 EVH |
1034 | } |
1035 | ||
5d385153 JP |
1036 | p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", |
1037 | clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); | |
8a0dc95f | 1038 | |
8b81ef58 EVH |
1039 | err = clnt->trans_mod->create(clnt, dev_name, options); |
1040 | if (err) | |
f28cdf04 | 1041 | goto put_trans; |
bd238fb4 | 1042 | |
c9ffb05c VJJ |
1043 | if (clnt->msize > clnt->trans_mod->maxsize) |
1044 | clnt->msize = clnt->trans_mod->maxsize; | |
8a0dc95f | 1045 | |
6936bf60 | 1046 | err = p9_client_version(clnt); |
bd238fb4 | 1047 | if (err) |
8781ff94 | 1048 | goto close_trans; |
bd238fb4 | 1049 | |
91a76be3 DM |
1050 | /* P9_HDRSZ + 4 is the smallest packet header we can have that is |
1051 | * followed by data accessed from userspace by read | |
1052 | */ | |
1053 | clnt->fcall_cache = | |
1054 | kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize, | |
1055 | 0, 0, P9_HDRSZ + 4, | |
1056 | clnt->msize - (P9_HDRSZ + 4), | |
1057 | NULL); | |
1058 | ||
bd238fb4 LI |
1059 | return clnt; |
1060 | ||
8781ff94 EVH |
1061 | close_trans: |
1062 | clnt->trans_mod->close(clnt); | |
8781ff94 EVH |
1063 | put_trans: |
1064 | v9fs_put_trans(clnt->trans_mod); | |
1065 | free_client: | |
1066 | kfree(clnt); | |
bd238fb4 LI |
1067 | return ERR_PTR(err); |
1068 | } | |
1069 | EXPORT_SYMBOL(p9_client_create); | |
1070 | ||
1071 | void p9_client_destroy(struct p9_client *clnt) | |
1072 | { | |
f28cdf04 MW |
1073 | struct p9_fid *fid; |
1074 | int id; | |
bd238fb4 | 1075 | |
5d385153 | 1076 | p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); |
bd238fb4 | 1077 | |
8b81ef58 EVH |
1078 | if (clnt->trans_mod) |
1079 | clnt->trans_mod->close(clnt); | |
bd238fb4 | 1080 | |
72029fe8 TH |
1081 | v9fs_put_trans(clnt->trans_mod); |
1082 | ||
f28cdf04 | 1083 | idr_for_each_entry(&clnt->fids, fid, id) { |
5d385153 | 1084 | pr_info("Found fid %d not clunked\n", fid->fid); |
bd238fb4 | 1085 | p9_fid_destroy(fid); |
6d96d3ab | 1086 | } |
bd238fb4 | 1087 | |
fea511a6 EVH |
1088 | p9_tag_cleanup(clnt); |
1089 | ||
91a76be3 | 1090 | kmem_cache_destroy(clnt->fcall_cache); |
bd238fb4 LI |
1091 | kfree(clnt); |
1092 | } | |
1093 | EXPORT_SYMBOL(p9_client_destroy); | |
1094 | ||
1095 | void p9_client_disconnect(struct p9_client *clnt) | |
1096 | { | |
5d385153 | 1097 | p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); |
8b81ef58 | 1098 | clnt->status = Disconnected; |
bd238fb4 LI |
1099 | } |
1100 | EXPORT_SYMBOL(p9_client_disconnect); | |
1101 | ||
6d96d3ab AK |
1102 | void p9_client_begin_disconnect(struct p9_client *clnt) |
1103 | { | |
5d385153 | 1104 | p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); |
6d96d3ab AK |
1105 | clnt->status = BeginDisconnect; |
1106 | } | |
1107 | EXPORT_SYMBOL(p9_client_begin_disconnect); | |
1108 | ||
bd238fb4 | 1109 | struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, |
7880b43b | 1110 | const char *uname, kuid_t n_uname, const char *aname) |
bd238fb4 | 1111 | { |
348b5901 | 1112 | int err = 0; |
51a87c55 | 1113 | struct p9_req_t *req; |
bd238fb4 | 1114 | struct p9_fid *fid; |
51a87c55 | 1115 | struct p9_qid qid; |
bd238fb4 | 1116 | |
bd238fb4 | 1117 | |
5d385153 JP |
1118 | p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", |
1119 | afid ? afid->fid : -1, uname, aname); | |
bd238fb4 | 1120 | fid = p9_fid_create(clnt); |
b5303be2 MW |
1121 | if (!fid) { |
1122 | err = -ENOMEM; | |
bd238fb4 LI |
1123 | goto error; |
1124 | } | |
21c9f5cc | 1125 | fid->uid = n_uname; |
bd238fb4 | 1126 | |
f791f7c5 | 1127 | req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, |
51a87c55 EVH |
1128 | afid ? afid->fid : P9_NOFID, uname, aname, n_uname); |
1129 | if (IS_ERR(req)) { | |
1130 | err = PTR_ERR(req); | |
bd238fb4 LI |
1131 | goto error; |
1132 | } | |
1133 | ||
523adb6c | 1134 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid); |
51a87c55 | 1135 | if (err) { |
523adb6c | 1136 | trace_9p_protocol_dump(clnt, &req->rc); |
43cbcbee | 1137 | p9_tag_remove(clnt, req); |
bd238fb4 | 1138 | goto error; |
51a87c55 | 1139 | } |
bd238fb4 | 1140 | |
5d385153 JP |
1141 | p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", |
1142 | qid.type, (unsigned long long)qid.path, qid.version); | |
51a87c55 EVH |
1143 | |
1144 | memmove(&fid->qid, &qid, sizeof(struct p9_qid)); | |
1145 | ||
43cbcbee | 1146 | p9_tag_remove(clnt, req); |
bd238fb4 LI |
1147 | return fid; |
1148 | ||
1149 | error: | |
bd238fb4 LI |
1150 | if (fid) |
1151 | p9_fid_destroy(fid); | |
1152 | return ERR_PTR(err); | |
1153 | } | |
1154 | EXPORT_SYMBOL(p9_client_attach); | |
1155 | ||
b76225e2 | 1156 | struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, |
7880b43b | 1157 | const unsigned char * const *wnames, int clone) |
bd238fb4 LI |
1158 | { |
1159 | int err; | |
bd238fb4 LI |
1160 | struct p9_client *clnt; |
1161 | struct p9_fid *fid; | |
51a87c55 EVH |
1162 | struct p9_qid *wqids; |
1163 | struct p9_req_t *req; | |
b76225e2 | 1164 | uint16_t nwqids, count; |
bd238fb4 | 1165 | |
bd238fb4 | 1166 | err = 0; |
62b2be59 | 1167 | wqids = NULL; |
bd238fb4 LI |
1168 | clnt = oldfid->clnt; |
1169 | if (clone) { | |
1170 | fid = p9_fid_create(clnt); | |
b5303be2 MW |
1171 | if (!fid) { |
1172 | err = -ENOMEM; | |
bd238fb4 LI |
1173 | goto error; |
1174 | } | |
1175 | ||
1176 | fid->uid = oldfid->uid; | |
1177 | } else | |
1178 | fid = oldfid; | |
1179 | ||
51a87c55 | 1180 | |
5d385153 JP |
1181 | p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", |
1182 | oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); | |
51a87c55 EVH |
1183 | |
1184 | req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, | |
1185 | nwname, wnames); | |
1186 | if (IS_ERR(req)) { | |
1187 | err = PTR_ERR(req); | |
bd238fb4 LI |
1188 | goto error; |
1189 | } | |
1190 | ||
523adb6c | 1191 | err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids); |
e7f4b8f1 | 1192 | if (err) { |
523adb6c | 1193 | trace_9p_protocol_dump(clnt, &req->rc); |
43cbcbee | 1194 | p9_tag_remove(clnt, req); |
51a87c55 | 1195 | goto clunk_fid; |
e7f4b8f1 | 1196 | } |
43cbcbee | 1197 | p9_tag_remove(clnt, req); |
bd238fb4 | 1198 | |
5d385153 | 1199 | p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); |
51a87c55 EVH |
1200 | |
1201 | if (nwqids != nwname) { | |
bd238fb4 LI |
1202 | err = -ENOENT; |
1203 | goto clunk_fid; | |
1204 | } | |
1205 | ||
51a87c55 | 1206 | for (count = 0; count < nwqids; count++) |
5d385153 | 1207 | p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", |
b0d5fdef RD |
1208 | count, wqids[count].type, |
1209 | (unsigned long long)wqids[count].path, | |
51a87c55 EVH |
1210 | wqids[count].version); |
1211 | ||
bd238fb4 | 1212 | if (nwname) |
51a87c55 | 1213 | memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); |
bd238fb4 LI |
1214 | else |
1215 | fid->qid = oldfid->qid; | |
1216 | ||
62b2be59 | 1217 | kfree(wqids); |
bd238fb4 LI |
1218 | return fid; |
1219 | ||
1220 | clunk_fid: | |
62b2be59 | 1221 | kfree(wqids); |
51a87c55 EVH |
1222 | p9_client_clunk(fid); |
1223 | fid = NULL; | |
bd238fb4 LI |
1224 | |
1225 | error: | |
bd238fb4 LI |
1226 | if (fid && (fid != oldfid)) |
1227 | p9_fid_destroy(fid); | |
1228 | ||
1229 | return ERR_PTR(err); | |
1230 | } | |
1231 | EXPORT_SYMBOL(p9_client_walk); | |
1232 | ||
1233 | int p9_client_open(struct p9_fid *fid, int mode) | |
1234 | { | |
1235 | int err; | |
bd238fb4 | 1236 | struct p9_client *clnt; |
51a87c55 EVH |
1237 | struct p9_req_t *req; |
1238 | struct p9_qid qid; | |
1239 | int iounit; | |
bd238fb4 | 1240 | |
bd238fb4 | 1241 | clnt = fid->clnt; |
5d385153 | 1242 | p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", |
ef56547e MK |
1243 | p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); |
1244 | err = 0; | |
bd238fb4 LI |
1245 | |
1246 | if (fid->mode != -1) | |
1247 | return -EINVAL; | |
1248 | ||
ef56547e MK |
1249 | if (p9_is_proto_dotl(clnt)) |
1250 | req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); | |
1251 | else | |
1252 | req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); | |
51a87c55 EVH |
1253 | if (IS_ERR(req)) { |
1254 | err = PTR_ERR(req); | |
1255 | goto error; | |
bd238fb4 LI |
1256 | } |
1257 | ||
523adb6c | 1258 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); |
e7f4b8f1 | 1259 | if (err) { |
523adb6c | 1260 | trace_9p_protocol_dump(clnt, &req->rc); |
e7f4b8f1 EVH |
1261 | goto free_and_error; |
1262 | } | |
51a87c55 | 1263 | |
5d385153 | 1264 | p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", |
ef56547e MK |
1265 | p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, |
1266 | (unsigned long long)qid.path, qid.version, iounit); | |
bd238fb4 LI |
1267 | |
1268 | fid->mode = mode; | |
51a87c55 | 1269 | fid->iounit = iounit; |
bd238fb4 | 1270 | |
e7f4b8f1 | 1271 | free_and_error: |
43cbcbee | 1272 | p9_tag_remove(clnt, req); |
51a87c55 | 1273 | error: |
bd238fb4 LI |
1274 | return err; |
1275 | } | |
1276 | EXPORT_SYMBOL(p9_client_open); | |
1277 | ||
7880b43b | 1278 | int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode, |
f791f7c5 | 1279 | kgid_t gid, struct p9_qid *qid) |
5643135a VJJ |
1280 | { |
1281 | int err = 0; | |
1282 | struct p9_client *clnt; | |
1283 | struct p9_req_t *req; | |
1284 | int iounit; | |
1285 | ||
5d385153 | 1286 | p9_debug(P9_DEBUG_9P, |
5643135a | 1287 | ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", |
f791f7c5 EB |
1288 | ofid->fid, name, flags, mode, |
1289 | from_kgid(&init_user_ns, gid)); | |
5643135a VJJ |
1290 | clnt = ofid->clnt; |
1291 | ||
1292 | if (ofid->mode != -1) | |
1293 | return -EINVAL; | |
1294 | ||
f791f7c5 | 1295 | req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, |
5643135a VJJ |
1296 | mode, gid); |
1297 | if (IS_ERR(req)) { | |
1298 | err = PTR_ERR(req); | |
1299 | goto error; | |
1300 | } | |
1301 | ||
523adb6c | 1302 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit); |
5643135a | 1303 | if (err) { |
523adb6c | 1304 | trace_9p_protocol_dump(clnt, &req->rc); |
5643135a VJJ |
1305 | goto free_and_error; |
1306 | } | |
1307 | ||
5d385153 | 1308 | p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", |
5643135a VJJ |
1309 | qid->type, |
1310 | (unsigned long long)qid->path, | |
1311 | qid->version, iounit); | |
1312 | ||
1313 | ofid->mode = mode; | |
1314 | ofid->iounit = iounit; | |
1315 | ||
1316 | free_and_error: | |
43cbcbee | 1317 | p9_tag_remove(clnt, req); |
5643135a VJJ |
1318 | error: |
1319 | return err; | |
1320 | } | |
1321 | EXPORT_SYMBOL(p9_client_create_dotl); | |
1322 | ||
7880b43b | 1323 | int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, |
bd238fb4 LI |
1324 | char *extension) |
1325 | { | |
1326 | int err; | |
bd238fb4 | 1327 | struct p9_client *clnt; |
51a87c55 EVH |
1328 | struct p9_req_t *req; |
1329 | struct p9_qid qid; | |
1330 | int iounit; | |
bd238fb4 | 1331 | |
5d385153 | 1332 | p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", |
51a87c55 | 1333 | fid->fid, name, perm, mode); |
bd238fb4 | 1334 | err = 0; |
bd238fb4 LI |
1335 | clnt = fid->clnt; |
1336 | ||
1337 | if (fid->mode != -1) | |
1338 | return -EINVAL; | |
1339 | ||
51a87c55 EVH |
1340 | req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, |
1341 | mode, extension); | |
1342 | if (IS_ERR(req)) { | |
1343 | err = PTR_ERR(req); | |
1344 | goto error; | |
bd238fb4 LI |
1345 | } |
1346 | ||
523adb6c | 1347 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); |
e7f4b8f1 | 1348 | if (err) { |
523adb6c | 1349 | trace_9p_protocol_dump(clnt, &req->rc); |
e7f4b8f1 EVH |
1350 | goto free_and_error; |
1351 | } | |
51a87c55 | 1352 | |
5d385153 | 1353 | p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", |
b0d5fdef RD |
1354 | qid.type, |
1355 | (unsigned long long)qid.path, | |
1356 | qid.version, iounit); | |
bd238fb4 LI |
1357 | |
1358 | fid->mode = mode; | |
51a87c55 | 1359 | fid->iounit = iounit; |
bd238fb4 | 1360 | |
e7f4b8f1 | 1361 | free_and_error: |
43cbcbee | 1362 | p9_tag_remove(clnt, req); |
51a87c55 | 1363 | error: |
bd238fb4 LI |
1364 | return err; |
1365 | } | |
1366 | EXPORT_SYMBOL(p9_client_fcreate); | |
1367 | ||
7880b43b AV |
1368 | int p9_client_symlink(struct p9_fid *dfid, const char *name, |
1369 | const char *symtgt, kgid_t gid, struct p9_qid *qid) | |
50cc42ff VJJ |
1370 | { |
1371 | int err = 0; | |
1372 | struct p9_client *clnt; | |
1373 | struct p9_req_t *req; | |
1374 | ||
5d385153 | 1375 | p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", |
50cc42ff VJJ |
1376 | dfid->fid, name, symtgt); |
1377 | clnt = dfid->clnt; | |
1378 | ||
f791f7c5 | 1379 | req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, |
50cc42ff VJJ |
1380 | gid); |
1381 | if (IS_ERR(req)) { | |
1382 | err = PTR_ERR(req); | |
1383 | goto error; | |
1384 | } | |
1385 | ||
523adb6c | 1386 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); |
50cc42ff | 1387 | if (err) { |
523adb6c | 1388 | trace_9p_protocol_dump(clnt, &req->rc); |
50cc42ff VJJ |
1389 | goto free_and_error; |
1390 | } | |
1391 | ||
5d385153 | 1392 | p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", |
50cc42ff VJJ |
1393 | qid->type, (unsigned long long)qid->path, qid->version); |
1394 | ||
1395 | free_and_error: | |
43cbcbee | 1396 | p9_tag_remove(clnt, req); |
50cc42ff VJJ |
1397 | error: |
1398 | return err; | |
1399 | } | |
1400 | EXPORT_SYMBOL(p9_client_symlink); | |
1401 | ||
7880b43b | 1402 | int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) |
652df9a7 VJJ |
1403 | { |
1404 | struct p9_client *clnt; | |
1405 | struct p9_req_t *req; | |
1406 | ||
5d385153 | 1407 | p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", |
652df9a7 VJJ |
1408 | dfid->fid, oldfid->fid, newname); |
1409 | clnt = dfid->clnt; | |
1410 | req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, | |
1411 | newname); | |
1412 | if (IS_ERR(req)) | |
1413 | return PTR_ERR(req); | |
1414 | ||
5d385153 | 1415 | p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); |
43cbcbee | 1416 | p9_tag_remove(clnt, req); |
652df9a7 VJJ |
1417 | return 0; |
1418 | } | |
1419 | EXPORT_SYMBOL(p9_client_link); | |
1420 | ||
b165d601 | 1421 | int p9_client_fsync(struct p9_fid *fid, int datasync) |
920e65dc VJJ |
1422 | { |
1423 | int err; | |
1424 | struct p9_client *clnt; | |
1425 | struct p9_req_t *req; | |
1426 | ||
5d385153 | 1427 | p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", |
b165d601 | 1428 | fid->fid, datasync); |
920e65dc VJJ |
1429 | err = 0; |
1430 | clnt = fid->clnt; | |
1431 | ||
b165d601 | 1432 | req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); |
920e65dc VJJ |
1433 | if (IS_ERR(req)) { |
1434 | err = PTR_ERR(req); | |
1435 | goto error; | |
1436 | } | |
1437 | ||
5d385153 | 1438 | p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); |
920e65dc | 1439 | |
43cbcbee | 1440 | p9_tag_remove(clnt, req); |
920e65dc VJJ |
1441 | |
1442 | error: | |
1443 | return err; | |
1444 | } | |
1445 | EXPORT_SYMBOL(p9_client_fsync); | |
1446 | ||
bd238fb4 LI |
1447 | int p9_client_clunk(struct p9_fid *fid) |
1448 | { | |
1449 | int err; | |
bd238fb4 | 1450 | struct p9_client *clnt; |
51a87c55 | 1451 | struct p9_req_t *req; |
208f3c28 | 1452 | int retries = 0; |
bd238fb4 | 1453 | |
8e44a080 | 1454 | if (!fid) { |
5d385153 JP |
1455 | pr_warn("%s (%d): Trying to clunk with NULL fid\n", |
1456 | __func__, task_pid_nr(current)); | |
8e44a080 | 1457 | dump_stack(); |
1458 | return 0; | |
1459 | } | |
1460 | ||
208f3c28 JG |
1461 | again: |
1462 | p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid, | |
1463 | retries); | |
bd238fb4 | 1464 | err = 0; |
bd238fb4 LI |
1465 | clnt = fid->clnt; |
1466 | ||
51a87c55 EVH |
1467 | req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); |
1468 | if (IS_ERR(req)) { | |
1469 | err = PTR_ERR(req); | |
1470 | goto error; | |
bd238fb4 LI |
1471 | } |
1472 | ||
5d385153 | 1473 | p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); |
bd238fb4 | 1474 | |
43cbcbee | 1475 | p9_tag_remove(clnt, req); |
51a87c55 | 1476 | error: |
5034990e AK |
1477 | /* |
1478 | * Fid is not valid even after a failed clunk | |
208f3c28 JG |
1479 | * If interrupted, retry once then give up and |
1480 | * leak fid until umount. | |
5034990e | 1481 | */ |
208f3c28 JG |
1482 | if (err == -ERESTARTSYS) { |
1483 | if (retries++ == 0) | |
1484 | goto again; | |
1485 | } else | |
1486 | p9_fid_destroy(fid); | |
bd238fb4 LI |
1487 | return err; |
1488 | } | |
1489 | EXPORT_SYMBOL(p9_client_clunk); | |
1490 | ||
1491 | int p9_client_remove(struct p9_fid *fid) | |
1492 | { | |
1493 | int err; | |
bd238fb4 | 1494 | struct p9_client *clnt; |
51a87c55 | 1495 | struct p9_req_t *req; |
bd238fb4 | 1496 | |
5d385153 | 1497 | p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); |
bd238fb4 | 1498 | err = 0; |
bd238fb4 LI |
1499 | clnt = fid->clnt; |
1500 | ||
51a87c55 EVH |
1501 | req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); |
1502 | if (IS_ERR(req)) { | |
1503 | err = PTR_ERR(req); | |
1504 | goto error; | |
bd238fb4 LI |
1505 | } |
1506 | ||
5d385153 | 1507 | p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); |
bd238fb4 | 1508 | |
43cbcbee | 1509 | p9_tag_remove(clnt, req); |
51a87c55 | 1510 | error: |
208f3c28 JG |
1511 | if (err == -ERESTARTSYS) |
1512 | p9_client_clunk(fid); | |
1513 | else | |
1514 | p9_fid_destroy(fid); | |
bd238fb4 LI |
1515 | return err; |
1516 | } | |
1517 | EXPORT_SYMBOL(p9_client_remove); | |
1518 | ||
48e370ff AK |
1519 | int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) |
1520 | { | |
1521 | int err = 0; | |
1522 | struct p9_req_t *req; | |
1523 | struct p9_client *clnt; | |
1524 | ||
5d385153 | 1525 | p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", |
48e370ff AK |
1526 | dfid->fid, name, flags); |
1527 | ||
1528 | clnt = dfid->clnt; | |
1529 | req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); | |
1530 | if (IS_ERR(req)) { | |
1531 | err = PTR_ERR(req); | |
1532 | goto error; | |
1533 | } | |
5d385153 | 1534 | p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); |
48e370ff | 1535 | |
43cbcbee | 1536 | p9_tag_remove(clnt, req); |
48e370ff AK |
1537 | error: |
1538 | return err; | |
1539 | } | |
1540 | EXPORT_SYMBOL(p9_client_unlinkat); | |
1541 | ||
0fc9655e | 1542 | int |
e1200fe6 | 1543 | p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) |
bd238fb4 | 1544 | { |
e1200fe6 | 1545 | struct p9_client *clnt = fid->clnt; |
abfa034e | 1546 | struct p9_req_t *req; |
e1200fe6 | 1547 | int total = 0; |
999b8b88 | 1548 | *err = 0; |
bd238fb4 | 1549 | |
5d385153 | 1550 | p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", |
e1200fe6 AV |
1551 | fid->fid, (unsigned long long) offset, (int)iov_iter_count(to)); |
1552 | ||
1553 | while (iov_iter_count(to)) { | |
1554 | int count = iov_iter_count(to); | |
1555 | int rsize, non_zc = 0; | |
1556 | char *dataptr; | |
c69f297d | 1557 | |
e1200fe6 AV |
1558 | rsize = fid->iounit; |
1559 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) | |
1560 | rsize = clnt->msize - P9_IOHDRSZ; | |
1561 | ||
1562 | if (count < rsize) | |
1563 | rsize = count; | |
1564 | ||
1565 | /* Don't bother zerocopy for small IO (< 1024) */ | |
1566 | if (clnt->trans_mod->zc_request && rsize > 1024) { | |
1567 | /* | |
1568 | * response header len is 11 | |
1569 | * PDU Header(7) + IO Size (4) | |
1570 | */ | |
1571 | req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, | |
1572 | 0, 11, "dqd", fid->fid, | |
1573 | offset, rsize); | |
1574 | } else { | |
1575 | non_zc = 1; | |
1576 | req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, | |
1577 | rsize); | |
1578 | } | |
1579 | if (IS_ERR(req)) { | |
1580 | *err = PTR_ERR(req); | |
1581 | break; | |
1582 | } | |
bd238fb4 | 1583 | |
523adb6c | 1584 | *err = p9pdu_readf(&req->rc, clnt->proto_version, |
e1200fe6 AV |
1585 | "D", &count, &dataptr); |
1586 | if (*err) { | |
523adb6c | 1587 | trace_9p_protocol_dump(clnt, &req->rc); |
43cbcbee | 1588 | p9_tag_remove(clnt, req); |
e1200fe6 AV |
1589 | break; |
1590 | } | |
0f1db7de AV |
1591 | if (rsize < count) { |
1592 | pr_err("bogus RREAD count (%d > %d)\n", count, rsize); | |
1593 | count = rsize; | |
1594 | } | |
bd238fb4 | 1595 | |
e1200fe6 AV |
1596 | p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); |
1597 | if (!count) { | |
43cbcbee | 1598 | p9_tag_remove(clnt, req); |
e1200fe6 AV |
1599 | break; |
1600 | } | |
bd238fb4 | 1601 | |
e1200fe6 AV |
1602 | if (non_zc) { |
1603 | int n = copy_to_iter(dataptr, count, to); | |
1604 | total += n; | |
1605 | offset += n; | |
1606 | if (n != count) { | |
1607 | *err = -EFAULT; | |
43cbcbee | 1608 | p9_tag_remove(clnt, req); |
e1200fe6 AV |
1609 | break; |
1610 | } | |
1611 | } else { | |
1612 | iov_iter_advance(to, count); | |
1613 | total += count; | |
1614 | offset += count; | |
1615 | } | |
43cbcbee | 1616 | p9_tag_remove(clnt, req); |
51a87c55 | 1617 | } |
e1200fe6 | 1618 | return total; |
bd238fb4 | 1619 | } |
0fc9655e | 1620 | EXPORT_SYMBOL(p9_client_read); |
bd238fb4 LI |
1621 | |
1622 | int | |
070b3656 | 1623 | p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) |
bd238fb4 | 1624 | { |
070b3656 | 1625 | struct p9_client *clnt = fid->clnt; |
51a87c55 | 1626 | struct p9_req_t *req; |
070b3656 | 1627 | int total = 0; |
999b8b88 | 1628 | *err = 0; |
070b3656 AV |
1629 | |
1630 | p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n", | |
1631 | fid->fid, (unsigned long long) offset, | |
1632 | iov_iter_count(from)); | |
1633 | ||
1634 | while (iov_iter_count(from)) { | |
1635 | int count = iov_iter_count(from); | |
1636 | int rsize = fid->iounit; | |
1637 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) | |
1638 | rsize = clnt->msize - P9_IOHDRSZ; | |
1639 | ||
1640 | if (count < rsize) | |
1641 | rsize = count; | |
1642 | ||
1643 | /* Don't bother zerocopy for small IO (< 1024) */ | |
1644 | if (clnt->trans_mod->zc_request && rsize > 1024) { | |
1645 | req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, | |
1646 | rsize, P9_ZC_HDR_SZ, "dqd", | |
1647 | fid->fid, offset, rsize); | |
1648 | } else { | |
1649 | req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, | |
1650 | offset, rsize, from); | |
1651 | } | |
1652 | if (IS_ERR(req)) { | |
1653 | *err = PTR_ERR(req); | |
1654 | break; | |
1655 | } | |
bd238fb4 | 1656 | |
523adb6c | 1657 | *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &count); |
070b3656 | 1658 | if (*err) { |
523adb6c | 1659 | trace_9p_protocol_dump(clnt, &req->rc); |
43cbcbee | 1660 | p9_tag_remove(clnt, req); |
67e808fb | 1661 | break; |
070b3656 | 1662 | } |
0f1db7de AV |
1663 | if (rsize < count) { |
1664 | pr_err("bogus RWRITE count (%d > %d)\n", count, rsize); | |
1665 | count = rsize; | |
1666 | } | |
1fc52481 | 1667 | |
070b3656 | 1668 | p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); |
0fc9655e | 1669 | |
43cbcbee | 1670 | p9_tag_remove(clnt, req); |
070b3656 AV |
1671 | iov_iter_advance(from, count); |
1672 | total += count; | |
1673 | offset += count; | |
e7f4b8f1 | 1674 | } |
070b3656 | 1675 | return total; |
bd238fb4 | 1676 | } |
0fc9655e | 1677 | EXPORT_SYMBOL(p9_client_write); |
bd238fb4 | 1678 | |
51a87c55 | 1679 | struct p9_wstat *p9_client_stat(struct p9_fid *fid) |
5503ac56 | 1680 | { |
51a87c55 EVH |
1681 | int err; |
1682 | struct p9_client *clnt; | |
1683 | struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); | |
1684 | struct p9_req_t *req; | |
1685 | u16 ignored; | |
5503ac56 | 1686 | |
5d385153 | 1687 | p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); |
5503ac56 | 1688 | |
5503ac56 EVH |
1689 | if (!ret) |
1690 | return ERR_PTR(-ENOMEM); | |
1691 | ||
bd238fb4 | 1692 | err = 0; |
bd238fb4 LI |
1693 | clnt = fid->clnt; |
1694 | ||
51a87c55 EVH |
1695 | req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); |
1696 | if (IS_ERR(req)) { | |
1697 | err = PTR_ERR(req); | |
bd238fb4 LI |
1698 | goto error; |
1699 | } | |
1700 | ||
523adb6c | 1701 | err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret); |
e7f4b8f1 | 1702 | if (err) { |
523adb6c | 1703 | trace_9p_protocol_dump(clnt, &req->rc); |
43cbcbee | 1704 | p9_tag_remove(clnt, req); |
eedfe1c4 | 1705 | goto error; |
e7f4b8f1 | 1706 | } |
bd238fb4 | 1707 | |
5d385153 | 1708 | p9_debug(P9_DEBUG_9P, |
e7f4b8f1 EVH |
1709 | "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" |
1710 | "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" | |
1711 | "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" | |
1712 | "<<< uid=%d gid=%d n_muid=%d\n", | |
51a87c55 | 1713 | ret->size, ret->type, ret->dev, ret->qid.type, |
b0d5fdef RD |
1714 | (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, |
1715 | ret->atime, ret->mtime, (unsigned long long)ret->length, | |
1716 | ret->name, ret->uid, ret->gid, ret->muid, ret->extension, | |
447c5094 EB |
1717 | from_kuid(&init_user_ns, ret->n_uid), |
1718 | from_kgid(&init_user_ns, ret->n_gid), | |
1719 | from_kuid(&init_user_ns, ret->n_muid)); | |
bd238fb4 | 1720 | |
43cbcbee | 1721 | p9_tag_remove(clnt, req); |
742b11a7 LI |
1722 | return ret; |
1723 | ||
bd238fb4 | 1724 | error: |
742b11a7 LI |
1725 | kfree(ret); |
1726 | return ERR_PTR(err); | |
bd238fb4 LI |
1727 | } |
1728 | EXPORT_SYMBOL(p9_client_stat); | |
1729 | ||
f0853122 SK |
1730 | struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, |
1731 | u64 request_mask) | |
1732 | { | |
1733 | int err; | |
1734 | struct p9_client *clnt; | |
1735 | struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl), | |
1736 | GFP_KERNEL); | |
1737 | struct p9_req_t *req; | |
1738 | ||
5d385153 | 1739 | p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", |
f0853122 SK |
1740 | fid->fid, request_mask); |
1741 | ||
1742 | if (!ret) | |
1743 | return ERR_PTR(-ENOMEM); | |
1744 | ||
1745 | err = 0; | |
1746 | clnt = fid->clnt; | |
1747 | ||
1748 | req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); | |
1749 | if (IS_ERR(req)) { | |
1750 | err = PTR_ERR(req); | |
1751 | goto error; | |
1752 | } | |
1753 | ||
523adb6c | 1754 | err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret); |
f0853122 | 1755 | if (err) { |
523adb6c | 1756 | trace_9p_protocol_dump(clnt, &req->rc); |
43cbcbee | 1757 | p9_tag_remove(clnt, req); |
f0853122 SK |
1758 | goto error; |
1759 | } | |
1760 | ||
5d385153 | 1761 | p9_debug(P9_DEBUG_9P, |
f0853122 SK |
1762 | "<<< RGETATTR st_result_mask=%lld\n" |
1763 | "<<< qid=%x.%llx.%x\n" | |
1764 | "<<< st_mode=%8.8x st_nlink=%llu\n" | |
1765 | "<<< st_uid=%d st_gid=%d\n" | |
1766 | "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" | |
1767 | "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" | |
1768 | "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" | |
1769 | "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" | |
1770 | "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" | |
64ad31f3 | 1771 | "<<< st_gen=%lld st_data_version=%lld\n", |
f0853122 | 1772 | ret->st_result_mask, ret->qid.type, ret->qid.path, |
447c5094 EB |
1773 | ret->qid.version, ret->st_mode, ret->st_nlink, |
1774 | from_kuid(&init_user_ns, ret->st_uid), | |
1775 | from_kgid(&init_user_ns, ret->st_gid), | |
1776 | ret->st_rdev, ret->st_size, ret->st_blksize, | |
f0853122 SK |
1777 | ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec, |
1778 | ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec, | |
1779 | ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec, | |
1780 | ret->st_gen, ret->st_data_version); | |
1781 | ||
43cbcbee | 1782 | p9_tag_remove(clnt, req); |
f0853122 SK |
1783 | return ret; |
1784 | ||
1785 | error: | |
1786 | kfree(ret); | |
1787 | return ERR_PTR(err); | |
1788 | } | |
1789 | EXPORT_SYMBOL(p9_client_getattr_dotl); | |
1790 | ||
342fee1d | 1791 | static int p9_client_statsize(struct p9_wstat *wst, int proto_version) |
453ed90d LI |
1792 | { |
1793 | int ret; | |
1794 | ||
9d6939da | 1795 | /* NOTE: size shouldn't include its own length */ |
453ed90d LI |
1796 | /* size[2] type[2] dev[4] qid[13] */ |
1797 | /* mode[4] atime[4] mtime[4] length[8]*/ | |
1798 | /* name[s] uid[s] gid[s] muid[s] */ | |
9d6939da | 1799 | ret = 2+4+13+4+4+4+8+2+2+2+2; |
453ed90d LI |
1800 | |
1801 | if (wst->name) | |
1802 | ret += strlen(wst->name); | |
1803 | if (wst->uid) | |
1804 | ret += strlen(wst->uid); | |
1805 | if (wst->gid) | |
1806 | ret += strlen(wst->gid); | |
1807 | if (wst->muid) | |
1808 | ret += strlen(wst->muid); | |
1809 | ||
c56e4acf SK |
1810 | if ((proto_version == p9_proto_2000u) || |
1811 | (proto_version == p9_proto_2000L)) { | |
453ed90d LI |
1812 | ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ |
1813 | if (wst->extension) | |
1814 | ret += strlen(wst->extension); | |
1815 | } | |
1816 | ||
1817 | return ret; | |
1818 | } | |
1819 | ||
bd238fb4 LI |
1820 | int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) |
1821 | { | |
1822 | int err; | |
51a87c55 | 1823 | struct p9_req_t *req; |
bd238fb4 LI |
1824 | struct p9_client *clnt; |
1825 | ||
453ed90d LI |
1826 | err = 0; |
1827 | clnt = fid->clnt; | |
342fee1d | 1828 | wst->size = p9_client_statsize(wst, clnt->proto_version); |
5d385153 JP |
1829 | p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); |
1830 | p9_debug(P9_DEBUG_9P, | |
e7f4b8f1 EVH |
1831 | " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" |
1832 | " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" | |
1833 | " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" | |
1834 | " uid=%d gid=%d n_muid=%d\n", | |
1835 | wst->size, wst->type, wst->dev, wst->qid.type, | |
b0d5fdef RD |
1836 | (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, |
1837 | wst->atime, wst->mtime, (unsigned long long)wst->length, | |
1838 | wst->name, wst->uid, wst->gid, wst->muid, wst->extension, | |
447c5094 EB |
1839 | from_kuid(&init_user_ns, wst->n_uid), |
1840 | from_kgid(&init_user_ns, wst->n_gid), | |
1841 | from_kuid(&init_user_ns, wst->n_muid)); | |
bd238fb4 | 1842 | |
9d6939da | 1843 | req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); |
51a87c55 EVH |
1844 | if (IS_ERR(req)) { |
1845 | err = PTR_ERR(req); | |
1846 | goto error; | |
bd238fb4 LI |
1847 | } |
1848 | ||
5d385153 | 1849 | p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); |
bd238fb4 | 1850 | |
43cbcbee | 1851 | p9_tag_remove(clnt, req); |
51a87c55 | 1852 | error: |
bd238fb4 LI |
1853 | return err; |
1854 | } | |
1855 | EXPORT_SYMBOL(p9_client_wstat); | |
bda8e775 | 1856 | |
87d7845a SK |
1857 | int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) |
1858 | { | |
1859 | int err; | |
1860 | struct p9_req_t *req; | |
1861 | struct p9_client *clnt; | |
1862 | ||
1863 | err = 0; | |
1864 | clnt = fid->clnt; | |
5d385153 JP |
1865 | p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); |
1866 | p9_debug(P9_DEBUG_9P, | |
87d7845a SK |
1867 | " valid=%x mode=%x uid=%d gid=%d size=%lld\n" |
1868 | " atime_sec=%lld atime_nsec=%lld\n" | |
1869 | " mtime_sec=%lld mtime_nsec=%lld\n", | |
447c5094 EB |
1870 | p9attr->valid, p9attr->mode, |
1871 | from_kuid(&init_user_ns, p9attr->uid), | |
1872 | from_kgid(&init_user_ns, p9attr->gid), | |
87d7845a SK |
1873 | p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, |
1874 | p9attr->mtime_sec, p9attr->mtime_nsec); | |
1875 | ||
1876 | req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); | |
1877 | ||
1878 | if (IS_ERR(req)) { | |
1879 | err = PTR_ERR(req); | |
1880 | goto error; | |
1881 | } | |
5d385153 | 1882 | p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); |
43cbcbee | 1883 | p9_tag_remove(clnt, req); |
87d7845a SK |
1884 | error: |
1885 | return err; | |
1886 | } | |
1887 | EXPORT_SYMBOL(p9_client_setattr); | |
1888 | ||
bda8e775 SK |
1889 | int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) |
1890 | { | |
1891 | int err; | |
1892 | struct p9_req_t *req; | |
1893 | struct p9_client *clnt; | |
1894 | ||
1895 | err = 0; | |
1896 | clnt = fid->clnt; | |
1897 | ||
5d385153 | 1898 | p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); |
bda8e775 SK |
1899 | |
1900 | req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); | |
1901 | if (IS_ERR(req)) { | |
1902 | err = PTR_ERR(req); | |
1903 | goto error; | |
1904 | } | |
1905 | ||
523adb6c DM |
1906 | err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, |
1907 | &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, | |
1908 | &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); | |
bda8e775 | 1909 | if (err) { |
523adb6c | 1910 | trace_9p_protocol_dump(clnt, &req->rc); |
43cbcbee | 1911 | p9_tag_remove(clnt, req); |
bda8e775 SK |
1912 | goto error; |
1913 | } | |
1914 | ||
5d385153 | 1915 | p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld " |
bda8e775 SK |
1916 | "blocks %llu bfree %llu bavail %llu files %llu ffree %llu " |
1917 | "fsid %llu namelen %ld\n", | |
1918 | fid->fid, (long unsigned int)sb->type, (long int)sb->bsize, | |
1919 | sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree, | |
1920 | sb->fsid, (long int)sb->namelen); | |
1921 | ||
43cbcbee | 1922 | p9_tag_remove(clnt, req); |
bda8e775 SK |
1923 | error: |
1924 | return err; | |
1925 | } | |
1926 | EXPORT_SYMBOL(p9_client_statfs); | |
4681dbda | 1927 | |
9e8fb38e AK |
1928 | int p9_client_rename(struct p9_fid *fid, |
1929 | struct p9_fid *newdirfid, const char *name) | |
4681dbda SK |
1930 | { |
1931 | int err; | |
1932 | struct p9_req_t *req; | |
1933 | struct p9_client *clnt; | |
1934 | ||
1935 | err = 0; | |
1936 | clnt = fid->clnt; | |
1937 | ||
5d385153 | 1938 | p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", |
4681dbda SK |
1939 | fid->fid, newdirfid->fid, name); |
1940 | ||
1941 | req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, | |
1942 | newdirfid->fid, name); | |
1943 | if (IS_ERR(req)) { | |
1944 | err = PTR_ERR(req); | |
1945 | goto error; | |
1946 | } | |
1947 | ||
5d385153 | 1948 | p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); |
4681dbda | 1949 | |
43cbcbee | 1950 | p9_tag_remove(clnt, req); |
4681dbda SK |
1951 | error: |
1952 | return err; | |
1953 | } | |
1954 | EXPORT_SYMBOL(p9_client_rename); | |
1955 | ||
9e8fb38e AK |
1956 | int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, |
1957 | struct p9_fid *newdirfid, const char *new_name) | |
1958 | { | |
1959 | int err; | |
1960 | struct p9_req_t *req; | |
1961 | struct p9_client *clnt; | |
1962 | ||
1963 | err = 0; | |
1964 | clnt = olddirfid->clnt; | |
1965 | ||
5d385153 | 1966 | p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s" |
9e8fb38e AK |
1967 | " newdirfid %d new name %s\n", olddirfid->fid, old_name, |
1968 | newdirfid->fid, new_name); | |
1969 | ||
1970 | req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, | |
1971 | old_name, newdirfid->fid, new_name); | |
1972 | if (IS_ERR(req)) { | |
1973 | err = PTR_ERR(req); | |
1974 | goto error; | |
1975 | } | |
1976 | ||
5d385153 | 1977 | p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", |
9e8fb38e AK |
1978 | newdirfid->fid, new_name); |
1979 | ||
43cbcbee | 1980 | p9_tag_remove(clnt, req); |
9e8fb38e AK |
1981 | error: |
1982 | return err; | |
1983 | } | |
1984 | EXPORT_SYMBOL(p9_client_renameat); | |
1985 | ||
0ef63f34 AK |
1986 | /* |
1987 | * An xattrwalk without @attr_name gives the fid for the lisxattr namespace | |
1988 | */ | |
1989 | struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, | |
1990 | const char *attr_name, u64 *attr_size) | |
1991 | { | |
1992 | int err; | |
1993 | struct p9_req_t *req; | |
1994 | struct p9_client *clnt; | |
1995 | struct p9_fid *attr_fid; | |
1996 | ||
1997 | err = 0; | |
1998 | clnt = file_fid->clnt; | |
1999 | attr_fid = p9_fid_create(clnt); | |
b5303be2 MW |
2000 | if (!attr_fid) { |
2001 | err = -ENOMEM; | |
0ef63f34 AK |
2002 | goto error; |
2003 | } | |
5d385153 | 2004 | p9_debug(P9_DEBUG_9P, |
0ef63f34 AK |
2005 | ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", |
2006 | file_fid->fid, attr_fid->fid, attr_name); | |
2007 | ||
2008 | req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", | |
2009 | file_fid->fid, attr_fid->fid, attr_name); | |
2010 | if (IS_ERR(req)) { | |
2011 | err = PTR_ERR(req); | |
2012 | goto error; | |
2013 | } | |
523adb6c | 2014 | err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size); |
0ef63f34 | 2015 | if (err) { |
523adb6c | 2016 | trace_9p_protocol_dump(clnt, &req->rc); |
43cbcbee | 2017 | p9_tag_remove(clnt, req); |
0ef63f34 AK |
2018 | goto clunk_fid; |
2019 | } | |
43cbcbee | 2020 | p9_tag_remove(clnt, req); |
5d385153 | 2021 | p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", |
0ef63f34 AK |
2022 | attr_fid->fid, *attr_size); |
2023 | return attr_fid; | |
2024 | clunk_fid: | |
2025 | p9_client_clunk(attr_fid); | |
2026 | attr_fid = NULL; | |
2027 | error: | |
2028 | if (attr_fid && (attr_fid != file_fid)) | |
2029 | p9_fid_destroy(attr_fid); | |
2030 | ||
2031 | return ERR_PTR(err); | |
2032 | } | |
2033 | EXPORT_SYMBOL_GPL(p9_client_xattrwalk); | |
2034 | ||
eda25e46 AK |
2035 | int p9_client_xattrcreate(struct p9_fid *fid, const char *name, |
2036 | u64 attr_size, int flags) | |
2037 | { | |
2038 | int err; | |
2039 | struct p9_req_t *req; | |
2040 | struct p9_client *clnt; | |
2041 | ||
5d385153 | 2042 | p9_debug(P9_DEBUG_9P, |
eda25e46 AK |
2043 | ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n", |
2044 | fid->fid, name, (long long)attr_size, flags); | |
2045 | err = 0; | |
2046 | clnt = fid->clnt; | |
2047 | req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", | |
2048 | fid->fid, name, attr_size, flags); | |
2049 | if (IS_ERR(req)) { | |
2050 | err = PTR_ERR(req); | |
2051 | goto error; | |
2052 | } | |
5d385153 | 2053 | p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); |
43cbcbee | 2054 | p9_tag_remove(clnt, req); |
eda25e46 AK |
2055 | error: |
2056 | return err; | |
2057 | } | |
2058 | EXPORT_SYMBOL_GPL(p9_client_xattrcreate); | |
2059 | ||
7751bdb3 SK |
2060 | int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) |
2061 | { | |
abfa034e | 2062 | int err, rsize, non_zc = 0; |
7751bdb3 SK |
2063 | struct p9_client *clnt; |
2064 | struct p9_req_t *req; | |
2065 | char *dataptr; | |
4f3b35c1 AV |
2066 | struct kvec kv = {.iov_base = data, .iov_len = count}; |
2067 | struct iov_iter to; | |
2068 | ||
aa563d7b | 2069 | iov_iter_kvec(&to, READ, &kv, 1, count); |
7751bdb3 | 2070 | |
5d385153 | 2071 | p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", |
95c96174 | 2072 | fid->fid, (unsigned long long) offset, count); |
7751bdb3 SK |
2073 | |
2074 | err = 0; | |
2075 | clnt = fid->clnt; | |
7751bdb3 SK |
2076 | |
2077 | rsize = fid->iounit; | |
2078 | if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ) | |
2079 | rsize = clnt->msize - P9_READDIRHDRSZ; | |
2080 | ||
2081 | if (count < rsize) | |
2082 | rsize = count; | |
2083 | ||
abfa034e AK |
2084 | /* Don't bother zerocopy for small IO (< 1024) */ |
2085 | if (clnt->trans_mod->zc_request && rsize > 1024) { | |
2086 | /* | |
2087 | * response header len is 11 | |
2088 | * PDU Header(7) + IO Size (4) | |
2089 | */ | |
4f3b35c1 AV |
2090 | req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, |
2091 | 11, "dqd", fid->fid, offset, rsize); | |
2c66523f | 2092 | } else { |
abfa034e | 2093 | non_zc = 1; |
2c66523f | 2094 | req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, |
abfa034e | 2095 | offset, rsize); |
2c66523f | 2096 | } |
7751bdb3 SK |
2097 | if (IS_ERR(req)) { |
2098 | err = PTR_ERR(req); | |
2099 | goto error; | |
2100 | } | |
2101 | ||
523adb6c | 2102 | err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr); |
7751bdb3 | 2103 | if (err) { |
523adb6c | 2104 | trace_9p_protocol_dump(clnt, &req->rc); |
7751bdb3 SK |
2105 | goto free_and_error; |
2106 | } | |
71d6ad08 AV |
2107 | if (rsize < count) { |
2108 | pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); | |
2109 | count = rsize; | |
2110 | } | |
7751bdb3 | 2111 | |
5d385153 | 2112 | p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); |
7751bdb3 | 2113 | |
abfa034e | 2114 | if (non_zc) |
7751bdb3 SK |
2115 | memmove(data, dataptr, count); |
2116 | ||
43cbcbee | 2117 | p9_tag_remove(clnt, req); |
7751bdb3 SK |
2118 | return count; |
2119 | ||
2120 | free_and_error: | |
43cbcbee | 2121 | p9_tag_remove(clnt, req); |
7751bdb3 SK |
2122 | error: |
2123 | return err; | |
2124 | } | |
2125 | EXPORT_SYMBOL(p9_client_readdir); | |
4b43516a | 2126 | |
7880b43b | 2127 | int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, |
f791f7c5 | 2128 | dev_t rdev, kgid_t gid, struct p9_qid *qid) |
4b43516a MK |
2129 | { |
2130 | int err; | |
2131 | struct p9_client *clnt; | |
2132 | struct p9_req_t *req; | |
2133 | ||
2134 | err = 0; | |
2135 | clnt = fid->clnt; | |
5d385153 | 2136 | p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d " |
4b43516a | 2137 | "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); |
f791f7c5 | 2138 | req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, |
4b43516a MK |
2139 | MAJOR(rdev), MINOR(rdev), gid); |
2140 | if (IS_ERR(req)) | |
2141 | return PTR_ERR(req); | |
2142 | ||
523adb6c | 2143 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); |
4b43516a | 2144 | if (err) { |
523adb6c | 2145 | trace_9p_protocol_dump(clnt, &req->rc); |
4b43516a MK |
2146 | goto error; |
2147 | } | |
5d385153 | 2148 | p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type, |
4b43516a MK |
2149 | (unsigned long long)qid->path, qid->version); |
2150 | ||
2151 | error: | |
43cbcbee | 2152 | p9_tag_remove(clnt, req); |
4b43516a MK |
2153 | return err; |
2154 | ||
2155 | } | |
2156 | EXPORT_SYMBOL(p9_client_mknod_dotl); | |
01a622bd | 2157 | |
7880b43b | 2158 | int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, |
f791f7c5 | 2159 | kgid_t gid, struct p9_qid *qid) |
01a622bd MK |
2160 | { |
2161 | int err; | |
2162 | struct p9_client *clnt; | |
2163 | struct p9_req_t *req; | |
2164 | ||
2165 | err = 0; | |
2166 | clnt = fid->clnt; | |
5d385153 | 2167 | p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", |
f791f7c5 EB |
2168 | fid->fid, name, mode, from_kgid(&init_user_ns, gid)); |
2169 | req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode, | |
01a622bd MK |
2170 | gid); |
2171 | if (IS_ERR(req)) | |
2172 | return PTR_ERR(req); | |
2173 | ||
523adb6c | 2174 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); |
01a622bd | 2175 | if (err) { |
523adb6c | 2176 | trace_9p_protocol_dump(clnt, &req->rc); |
01a622bd MK |
2177 | goto error; |
2178 | } | |
5d385153 | 2179 | p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, |
01a622bd MK |
2180 | (unsigned long long)qid->path, qid->version); |
2181 | ||
2182 | error: | |
43cbcbee | 2183 | p9_tag_remove(clnt, req); |
01a622bd MK |
2184 | return err; |
2185 | ||
2186 | } | |
2187 | EXPORT_SYMBOL(p9_client_mkdir_dotl); | |
a099027c MK |
2188 | |
2189 | int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) | |
2190 | { | |
2191 | int err; | |
2192 | struct p9_client *clnt; | |
2193 | struct p9_req_t *req; | |
2194 | ||
2195 | err = 0; | |
2196 | clnt = fid->clnt; | |
5d385153 | 2197 | p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d " |
a099027c MK |
2198 | "start %lld length %lld proc_id %d client_id %s\n", |
2199 | fid->fid, flock->type, flock->flags, flock->start, | |
2200 | flock->length, flock->proc_id, flock->client_id); | |
2201 | ||
2202 | req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, | |
2203 | flock->flags, flock->start, flock->length, | |
2204 | flock->proc_id, flock->client_id); | |
2205 | ||
2206 | if (IS_ERR(req)) | |
2207 | return PTR_ERR(req); | |
2208 | ||
523adb6c | 2209 | err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status); |
a099027c | 2210 | if (err) { |
523adb6c | 2211 | trace_9p_protocol_dump(clnt, &req->rc); |
a099027c MK |
2212 | goto error; |
2213 | } | |
5d385153 | 2214 | p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); |
a099027c | 2215 | error: |
43cbcbee | 2216 | p9_tag_remove(clnt, req); |
a099027c MK |
2217 | return err; |
2218 | ||
2219 | } | |
2220 | EXPORT_SYMBOL(p9_client_lock_dotl); | |
1d769cd1 MK |
2221 | |
2222 | int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) | |
2223 | { | |
2224 | int err; | |
2225 | struct p9_client *clnt; | |
2226 | struct p9_req_t *req; | |
2227 | ||
2228 | err = 0; | |
2229 | clnt = fid->clnt; | |
5d385153 | 2230 | p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld " |
1d769cd1 MK |
2231 | "length %lld proc_id %d client_id %s\n", fid->fid, glock->type, |
2232 | glock->start, glock->length, glock->proc_id, glock->client_id); | |
2233 | ||
2234 | req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type, | |
2235 | glock->start, glock->length, glock->proc_id, glock->client_id); | |
2236 | ||
2237 | if (IS_ERR(req)) | |
2238 | return PTR_ERR(req); | |
2239 | ||
523adb6c DM |
2240 | err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type, |
2241 | &glock->start, &glock->length, &glock->proc_id, | |
2242 | &glock->client_id); | |
1d769cd1 | 2243 | if (err) { |
523adb6c | 2244 | trace_9p_protocol_dump(clnt, &req->rc); |
1d769cd1 MK |
2245 | goto error; |
2246 | } | |
5d385153 | 2247 | p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld " |
1d769cd1 MK |
2248 | "proc_id %d client_id %s\n", glock->type, glock->start, |
2249 | glock->length, glock->proc_id, glock->client_id); | |
2250 | error: | |
43cbcbee | 2251 | p9_tag_remove(clnt, req); |
1d769cd1 MK |
2252 | return err; |
2253 | } | |
2254 | EXPORT_SYMBOL(p9_client_getlock_dotl); | |
329176cc MK |
2255 | |
2256 | int p9_client_readlink(struct p9_fid *fid, char **target) | |
2257 | { | |
2258 | int err; | |
2259 | struct p9_client *clnt; | |
2260 | struct p9_req_t *req; | |
2261 | ||
2262 | err = 0; | |
2263 | clnt = fid->clnt; | |
5d385153 | 2264 | p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); |
329176cc MK |
2265 | |
2266 | req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); | |
2267 | if (IS_ERR(req)) | |
2268 | return PTR_ERR(req); | |
2269 | ||
523adb6c | 2270 | err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target); |
329176cc | 2271 | if (err) { |
523adb6c | 2272 | trace_9p_protocol_dump(clnt, &req->rc); |
329176cc MK |
2273 | goto error; |
2274 | } | |
5d385153 | 2275 | p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); |
329176cc | 2276 | error: |
43cbcbee | 2277 | p9_tag_remove(clnt, req); |
329176cc MK |
2278 | return err; |
2279 | } | |
2280 | EXPORT_SYMBOL(p9_client_readlink); | |
996d5b4d MW |
2281 | |
2282 | int __init p9_client_init(void) | |
2283 | { | |
728356de | 2284 | p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); |
996d5b4d MW |
2285 | return p9_req_cache ? 0 : -ENOMEM; |
2286 | } | |
2287 | ||
2288 | void __exit p9_client_exit(void) | |
2289 | { | |
2290 | kmem_cache_destroy(p9_req_cache); | |
2291 | } |