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1f327613 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
bd238fb4 LI |
2 | /* |
3 | * net/9p/clnt.c | |
4 | * | |
5 | * 9P Client | |
6 | * | |
8a0dc95f | 7 | * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com> |
bd238fb4 | 8 | * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net> |
bd238fb4 LI |
9 | */ |
10 | ||
5d385153 JP |
11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
12 | ||
bd238fb4 LI |
13 | #include <linux/module.h> |
14 | #include <linux/errno.h> | |
15 | #include <linux/fs.h> | |
8a0dc95f | 16 | #include <linux/poll.h> |
bd238fb4 LI |
17 | #include <linux/idr.h> |
18 | #include <linux/mutex.h> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
3f07c014 | 20 | #include <linux/sched/signal.h> |
bd238fb4 | 21 | #include <linux/uaccess.h> |
4f3b35c1 | 22 | #include <linux/uio.h> |
bd238fb4 | 23 | #include <net/9p/9p.h> |
fb0466c3 | 24 | #include <linux/parser.h> |
c4fac910 | 25 | #include <linux/seq_file.h> |
bd238fb4 | 26 | #include <net/9p/client.h> |
8b81ef58 | 27 | #include <net/9p/transport.h> |
51a87c55 | 28 | #include "protocol.h" |
bd238fb4 | 29 | |
348b5901 AK |
30 | #define CREATE_TRACE_POINTS |
31 | #include <trace/events/9p.h> | |
32 | ||
9c4d94dc | 33 | #define DEFAULT_MSIZE (128 * 1024) |
9210fc0a | 34 | |
8a0dc95f EVH |
35 | /* |
36 | * Client Option Parsing (code inspired by NFS code) | |
37 | * - a little lazy - parse all client options | |
38 | */ | |
39 | ||
40 | enum { | |
41 | Opt_msize, | |
42 | Opt_trans, | |
43 | Opt_legacy, | |
0fb80abd | 44 | Opt_version, |
8a0dc95f EVH |
45 | Opt_err, |
46 | }; | |
47 | ||
a447c093 | 48 | static const match_table_t tokens = { |
8a0dc95f EVH |
49 | {Opt_msize, "msize=%u"}, |
50 | {Opt_legacy, "noextend"}, | |
51 | {Opt_trans, "trans=%s"}, | |
0fb80abd | 52 | {Opt_version, "version=%s"}, |
8a0dc95f EVH |
53 | {Opt_err, NULL}, |
54 | }; | |
55 | ||
342fee1d SK |
56 | inline int p9_is_proto_dotl(struct p9_client *clnt) |
57 | { | |
a02cec21 | 58 | return clnt->proto_version == p9_proto_2000L; |
342fee1d SK |
59 | } |
60 | EXPORT_SYMBOL(p9_is_proto_dotl); | |
61 | ||
62 | inline int p9_is_proto_dotu(struct p9_client *clnt) | |
63 | { | |
a02cec21 | 64 | return clnt->proto_version == p9_proto_2000u; |
342fee1d SK |
65 | } |
66 | EXPORT_SYMBOL(p9_is_proto_dotu); | |
67 | ||
c4fac910 DH |
68 | int p9_show_client_options(struct seq_file *m, struct p9_client *clnt) |
69 | { | |
9210fc0a | 70 | if (clnt->msize != DEFAULT_MSIZE) |
c4fac910 | 71 | seq_printf(m, ",msize=%u", clnt->msize); |
61b272c3 | 72 | seq_printf(m, ",trans=%s", clnt->trans_mod->name); |
c4fac910 DH |
73 | |
74 | switch (clnt->proto_version) { | |
75 | case p9_proto_legacy: | |
76 | seq_puts(m, ",noextend"); | |
77 | break; | |
78 | case p9_proto_2000u: | |
79 | seq_puts(m, ",version=9p2000.u"); | |
80 | break; | |
81 | case p9_proto_2000L: | |
82 | /* Default */ | |
83 | break; | |
84 | } | |
85 | ||
86 | if (clnt->trans_mod->show_options) | |
87 | return clnt->trans_mod->show_options(m, clnt); | |
88 | return 0; | |
89 | } | |
90 | EXPORT_SYMBOL(p9_show_client_options); | |
91 | ||
43def35c SD |
92 | /* |
93 | * Some error codes are taken directly from the server replies, | |
94 | * make sure they are valid. | |
95 | */ | |
96 | static int safe_errno(int err) | |
97 | { | |
98 | if ((err > 0) || (err < -MAX_ERRNO)) { | |
99 | p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err); | |
100 | return -EPROTO; | |
101 | } | |
102 | return err; | |
103 | } | |
104 | ||
105 | ||
0fb80abd | 106 | /* Interpret mount option for protocol version */ |
4d63055f | 107 | static int get_protocol_version(char *s) |
0fb80abd | 108 | { |
3dc9fef6 DC |
109 | int version = -EINVAL; |
110 | ||
4d63055f | 111 | if (!strcmp(s, "9p2000")) { |
0fb80abd | 112 | version = p9_proto_legacy; |
5d385153 | 113 | p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n"); |
4d63055f | 114 | } else if (!strcmp(s, "9p2000.u")) { |
0fb80abd | 115 | version = p9_proto_2000u; |
5d385153 | 116 | p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n"); |
4d63055f | 117 | } else if (!strcmp(s, "9p2000.L")) { |
45bc21ed | 118 | version = p9_proto_2000L; |
5d385153 | 119 | p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n"); |
4d63055f | 120 | } else |
5d385153 | 121 | pr_info("Unknown protocol version %s\n", s); |
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 EVH |
149 | tmp_options = kstrdup(opts, GFP_KERNEL); |
150 | if (!tmp_options) { | |
5d385153 JP |
151 | p9_debug(P9_DEBUG_ERROR, |
152 | "failed to allocate copy of option string\n"); | |
bb8ffdfc EVH |
153 | return -ENOMEM; |
154 | } | |
d8c8a9e3 | 155 | options = tmp_options; |
8a0dc95f EVH |
156 | |
157 | while ((p = strsep(&options, ",")) != NULL) { | |
4d5077f1 | 158 | int token, r; |
8a0dc95f EVH |
159 | if (!*p) |
160 | continue; | |
161 | token = match_token(p, tokens, args); | |
4d5077f1 AK |
162 | switch (token) { |
163 | case Opt_msize: | |
164 | r = match_int(&args[0], &option); | |
bb8ffdfc | 165 | if (r < 0) { |
5d385153 JP |
166 | p9_debug(P9_DEBUG_ERROR, |
167 | "integer field, but no integer?\n"); | |
bb8ffdfc | 168 | ret = r; |
8a0dc95f EVH |
169 | continue; |
170 | } | |
574d356b DM |
171 | if (option < 4096) { |
172 | p9_debug(P9_DEBUG_ERROR, | |
173 | "msize should be at least 4k\n"); | |
174 | ret = -EINVAL; | |
175 | continue; | |
176 | } | |
8a0dc95f EVH |
177 | clnt->msize = option; |
178 | break; | |
179 | case Opt_trans: | |
4d63055f PK |
180 | s = match_strdup(&args[0]); |
181 | if (!s) { | |
182 | ret = -ENOMEM; | |
5d385153 JP |
183 | p9_debug(P9_DEBUG_ERROR, |
184 | "problem allocating copy of trans arg\n"); | |
4d63055f | 185 | goto free_and_return; |
9421c3e6 CX |
186 | } |
187 | ||
188 | v9fs_put_trans(clnt->trans_mod); | |
4d63055f PK |
189 | clnt->trans_mod = v9fs_get_trans_by_name(s); |
190 | if (clnt->trans_mod == NULL) { | |
5d385153 JP |
191 | pr_info("Could not find request transport: %s\n", |
192 | s); | |
349d3bb8 | 193 | ret = -EINVAL; |
349d3bb8 | 194 | } |
4d63055f | 195 | kfree(s); |
8a0dc95f EVH |
196 | break; |
197 | case Opt_legacy: | |
342fee1d | 198 | clnt->proto_version = p9_proto_legacy; |
8a0dc95f | 199 | break; |
0fb80abd | 200 | case Opt_version: |
4d63055f PK |
201 | s = match_strdup(&args[0]); |
202 | if (!s) { | |
203 | ret = -ENOMEM; | |
5d385153 JP |
204 | p9_debug(P9_DEBUG_ERROR, |
205 | "problem allocating copy of version arg\n"); | |
0fb80abd | 206 | goto free_and_return; |
4d63055f | 207 | } |
8d856c72 CX |
208 | r = get_protocol_version(s); |
209 | if (r < 0) | |
210 | ret = r; | |
211 | else | |
212 | clnt->proto_version = r; | |
4d63055f | 213 | kfree(s); |
0fb80abd | 214 | break; |
8a0dc95f EVH |
215 | default: |
216 | continue; | |
217 | } | |
218 | } | |
72029fe8 | 219 | |
349d3bb8 | 220 | free_and_return: |
c290fba8 | 221 | if (ret) |
222 | v9fs_put_trans(clnt->trans_mod); | |
d8c8a9e3 | 223 | kfree(tmp_options); |
bb8ffdfc | 224 | return ret; |
8a0dc95f EVH |
225 | } |
226 | ||
91a76be3 DM |
227 | static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc, |
228 | int alloc_msize) | |
5387320d | 229 | { |
91a76be3 DM |
230 | if (likely(c->fcall_cache) && alloc_msize == c->msize) { |
231 | fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS); | |
232 | fc->cache = c->fcall_cache; | |
233 | } else { | |
234 | fc->sdata = kmalloc(alloc_msize, GFP_NOFS); | |
235 | fc->cache = NULL; | |
236 | } | |
523adb6c DM |
237 | if (!fc->sdata) |
238 | return -ENOMEM; | |
5387320d | 239 | fc->capacity = alloc_msize; |
523adb6c DM |
240 | return 0; |
241 | } | |
242 | ||
243 | void p9_fcall_fini(struct p9_fcall *fc) | |
244 | { | |
91a76be3 DM |
245 | /* sdata can be NULL for interrupted requests in trans_rdma, |
246 | * and kmem_cache_free does not do NULL-check for us | |
247 | */ | |
248 | if (unlikely(!fc->sdata)) | |
249 | return; | |
250 | ||
251 | if (fc->cache) | |
252 | kmem_cache_free(fc->cache, fc->sdata); | |
253 | else | |
254 | kfree(fc->sdata); | |
5387320d | 255 | } |
523adb6c | 256 | EXPORT_SYMBOL(p9_fcall_fini); |
5387320d | 257 | |
996d5b4d MW |
258 | static struct kmem_cache *p9_req_cache; |
259 | ||
fea511a6 | 260 | /** |
03ff7371 | 261 | * p9_tag_alloc - Allocate a new request. |
996d5b4d MW |
262 | * @c: Client session. |
263 | * @type: Transaction type. | |
264 | * @max_size: Maximum packet size for this request. | |
fea511a6 | 265 | * |
996d5b4d MW |
266 | * Context: Process context. |
267 | * Return: Pointer to new request. | |
fea511a6 | 268 | */ |
ef6b0807 | 269 | static struct p9_req_t * |
996d5b4d | 270 | p9_tag_alloc(struct p9_client *c, int8_t type, unsigned int max_size) |
fea511a6 | 271 | { |
996d5b4d | 272 | struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS); |
abfa034e | 273 | int alloc_msize = min(c->msize, max_size); |
996d5b4d | 274 | int tag; |
fea511a6 | 275 | |
996d5b4d | 276 | if (!req) |
72ea0321 | 277 | return ERR_PTR(-ENOMEM); |
fea511a6 | 278 | |
91a76be3 | 279 | if (p9_fcall_init(c, &req->tc, alloc_msize)) |
523adb6c | 280 | goto free_req; |
91a76be3 | 281 | if (p9_fcall_init(c, &req->rc, alloc_msize)) |
996d5b4d | 282 | goto free; |
51a87c55 | 283 | |
523adb6c DM |
284 | p9pdu_reset(&req->tc); |
285 | p9pdu_reset(&req->rc); | |
0ce772fe | 286 | req->t_err = 0; |
51a87c55 | 287 | req->status = REQ_STATUS_ALLOC; |
996d5b4d MW |
288 | init_waitqueue_head(&req->wq); |
289 | INIT_LIST_HEAD(&req->req_list); | |
290 | ||
291 | idr_preload(GFP_NOFS); | |
292 | spin_lock_irq(&c->lock); | |
293 | if (type == P9_TVERSION) | |
294 | tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1, | |
295 | GFP_NOWAIT); | |
296 | else | |
297 | tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT); | |
523adb6c | 298 | req->tc.tag = tag; |
996d5b4d MW |
299 | spin_unlock_irq(&c->lock); |
300 | idr_preload_end(); | |
301 | if (tag < 0) | |
302 | goto free; | |
fea511a6 | 303 | |
728356de TB |
304 | /* Init ref to two because in the general case there is one ref |
305 | * that is put asynchronously by a writer thread, one ref | |
306 | * temporarily given by p9_tag_lookup and put by p9_client_cb | |
307 | * in the recv thread, and one ref put by p9_tag_remove in the | |
308 | * main thread. The only exception is virtio that does not use | |
309 | * p9_tag_lookup but does not have a writer thread either | |
310 | * (the write happens synchronously in the request/zc_request | |
311 | * callback), so p9_client_cb eats the second ref there | |
312 | * as the pointer is duplicated directly by virtqueue_add_sgs() | |
313 | */ | |
314 | refcount_set(&req->refcount.refcount, 2); | |
315 | ||
ea071aa1 SD |
316 | return req; |
317 | ||
996d5b4d | 318 | free: |
523adb6c DM |
319 | p9_fcall_fini(&req->tc); |
320 | p9_fcall_fini(&req->rc); | |
321 | free_req: | |
996d5b4d | 322 | kmem_cache_free(p9_req_cache, req); |
ea071aa1 | 323 | return ERR_PTR(-ENOMEM); |
fea511a6 | 324 | } |
fea511a6 EVH |
325 | |
326 | /** | |
996d5b4d MW |
327 | * p9_tag_lookup - Look up a request by tag. |
328 | * @c: Client session. | |
329 | * @tag: Transaction ID. | |
fea511a6 | 330 | * |
996d5b4d MW |
331 | * Context: Any context. |
332 | * Return: A request, or %NULL if there is no request with that tag. | |
fea511a6 | 333 | */ |
fea511a6 EVH |
334 | struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) |
335 | { | |
996d5b4d | 336 | struct p9_req_t *req; |
fea511a6 | 337 | |
996d5b4d | 338 | rcu_read_lock(); |
728356de | 339 | again: |
996d5b4d | 340 | req = idr_find(&c->reqs, tag); |
728356de TB |
341 | if (req) { |
342 | /* We have to be careful with the req found under rcu_read_lock | |
343 | * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the | |
344 | * ref again without corrupting other data, then check again | |
345 | * that the tag matches once we have the ref | |
346 | */ | |
347 | if (!p9_req_try_get(req)) | |
348 | goto again; | |
349 | if (req->tc.tag != tag) { | |
350 | p9_req_put(req); | |
351 | goto again; | |
352 | } | |
353 | } | |
996d5b4d | 354 | rcu_read_unlock(); |
fea511a6 | 355 | |
996d5b4d | 356 | return req; |
fea511a6 EVH |
357 | } |
358 | EXPORT_SYMBOL(p9_tag_lookup); | |
359 | ||
360 | /** | |
43cbcbee | 361 | * p9_tag_remove - Remove a tag. |
996d5b4d | 362 | * @c: Client session. |
43cbcbee | 363 | * @r: Request of reference. |
fea511a6 | 364 | * |
996d5b4d | 365 | * Context: Any context. |
fea511a6 | 366 | */ |
728356de | 367 | static int p9_tag_remove(struct p9_client *c, struct p9_req_t *r) |
fea511a6 | 368 | { |
996d5b4d | 369 | unsigned long flags; |
523adb6c | 370 | u16 tag = r->tc.tag; |
fea511a6 | 371 | |
996d5b4d MW |
372 | p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag); |
373 | spin_lock_irqsave(&c->lock, flags); | |
374 | idr_remove(&c->reqs, tag); | |
375 | spin_unlock_irqrestore(&c->lock, flags); | |
728356de TB |
376 | return p9_req_put(r); |
377 | } | |
378 | ||
379 | static void p9_req_free(struct kref *ref) | |
380 | { | |
381 | struct p9_req_t *r = container_of(ref, struct p9_req_t, refcount); | |
523adb6c DM |
382 | p9_fcall_fini(&r->tc); |
383 | p9_fcall_fini(&r->rc); | |
996d5b4d | 384 | kmem_cache_free(p9_req_cache, r); |
fea511a6 EVH |
385 | } |
386 | ||
728356de TB |
387 | int p9_req_put(struct p9_req_t *r) |
388 | { | |
389 | return kref_put(&r->refcount, p9_req_free); | |
390 | } | |
391 | EXPORT_SYMBOL(p9_req_put); | |
392 | ||
fea511a6 EVH |
393 | /** |
394 | * p9_tag_cleanup - cleans up tags structure and reclaims resources | |
0e15597e | 395 | * @c: v9fs client struct |
fea511a6 EVH |
396 | * |
397 | * This frees resources associated with the tags structure | |
398 | * | |
399 | */ | |
400 | static void p9_tag_cleanup(struct p9_client *c) | |
401 | { | |
996d5b4d MW |
402 | struct p9_req_t *req; |
403 | int id; | |
fea511a6 | 404 | |
996d5b4d MW |
405 | rcu_read_lock(); |
406 | idr_for_each_entry(&c->reqs, req, id) { | |
407 | pr_info("Tag %d still in use\n", id); | |
728356de TB |
408 | if (p9_tag_remove(c, req) == 0) |
409 | pr_warn("Packet with tag %d has still references", | |
410 | req->tc.tag); | |
fea511a6 | 411 | } |
996d5b4d | 412 | rcu_read_unlock(); |
673d62cd EVH |
413 | } |
414 | ||
91b8534f EVH |
415 | /** |
416 | * p9_client_cb - call back from transport to client | |
760b3d61 AL |
417 | * @c: client state |
418 | * @req: request received | |
419 | * @status: request status, one of REQ_STATUS_* | |
91b8534f EVH |
420 | * |
421 | */ | |
2b6e72ed | 422 | void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) |
91b8534f | 423 | { |
523adb6c | 424 | p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag); |
2b6e72ed DM |
425 | |
426 | /* | |
427 | * This barrier is needed to make sure any change made to req before | |
2d58f63f | 428 | * the status change is visible to another thread |
2b6e72ed DM |
429 | */ |
430 | smp_wmb(); | |
431 | req->status = status; | |
432 | ||
2557d0c5 | 433 | wake_up(&req->wq); |
523adb6c | 434 | p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag); |
728356de | 435 | p9_req_put(req); |
91b8534f EVH |
436 | } |
437 | EXPORT_SYMBOL(p9_client_cb); | |
438 | ||
51a87c55 EVH |
439 | /** |
440 | * p9_parse_header - parse header arguments out of a packet | |
441 | * @pdu: packet to parse | |
442 | * @size: size of packet | |
443 | * @type: type of request | |
444 | * @tag: tag of packet | |
445 | * @rewind: set if we need to rewind offset afterwards | |
446 | */ | |
447 | ||
448 | int | |
449 | p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag, | |
450 | int rewind) | |
451 | { | |
452 | int8_t r_type; | |
453 | int16_t r_tag; | |
454 | int32_t r_size; | |
455 | int offset = pdu->offset; | |
456 | int err; | |
457 | ||
458 | pdu->offset = 0; | |
51a87c55 EVH |
459 | |
460 | err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); | |
461 | if (err) | |
462 | goto rewind_and_exit; | |
463 | ||
51a87c55 EVH |
464 | if (type) |
465 | *type = r_type; | |
466 | if (tag) | |
467 | *tag = r_tag; | |
468 | if (size) | |
469 | *size = r_size; | |
470 | ||
f984579a TB |
471 | if (pdu->size != r_size || r_size < 7) { |
472 | err = -EINVAL; | |
473 | goto rewind_and_exit; | |
474 | } | |
475 | ||
476 | pdu->id = r_type; | |
477 | pdu->tag = r_tag; | |
478 | ||
479 | p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", | |
480 | pdu->size, pdu->id, pdu->tag); | |
51a87c55 EVH |
481 | |
482 | rewind_and_exit: | |
483 | if (rewind) | |
484 | pdu->offset = offset; | |
485 | return err; | |
486 | } | |
487 | EXPORT_SYMBOL(p9_parse_header); | |
488 | ||
489 | /** | |
490 | * p9_check_errors - check 9p packet for error return and process it | |
491 | * @c: current client instance | |
492 | * @req: request to parse and check for error conditions | |
493 | * | |
494 | * returns error code if one is discovered, otherwise returns 0 | |
495 | * | |
496 | * this will have to be more complicated if we have multiple | |
497 | * error packet types | |
498 | */ | |
499 | ||
500 | static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) | |
501 | { | |
502 | int8_t type; | |
503 | int err; | |
ca41bb3e | 504 | int ecode; |
51a87c55 | 505 | |
523adb6c DM |
506 | err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); |
507 | if (req->rc.size >= c->msize) { | |
f984579a TB |
508 | p9_debug(P9_DEBUG_ERROR, |
509 | "requested packet size too big: %d\n", | |
523adb6c | 510 | req->rc.size); |
f984579a TB |
511 | return -EIO; |
512 | } | |
348b5901 AK |
513 | /* |
514 | * dump the response from server | |
515 | * This should be after check errors which poplulate pdu_fcall. | |
516 | */ | |
523adb6c | 517 | trace_9p_protocol_dump(c, &req->rc); |
51a87c55 | 518 | if (err) { |
5d385153 | 519 | p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); |
51a87c55 EVH |
520 | return err; |
521 | } | |
ca41bb3e VJJ |
522 | if (type != P9_RERROR && type != P9_RLERROR) |
523 | return 0; | |
4f7ebe80 | 524 | |
ca41bb3e VJJ |
525 | if (!p9_is_proto_dotl(c)) { |
526 | char *ename; | |
523adb6c | 527 | err = p9pdu_readf(&req->rc, c->proto_version, "s?d", |
abfa034e | 528 | &ename, &ecode); |
ca41bb3e VJJ |
529 | if (err) |
530 | goto out_err; | |
4f7ebe80 | 531 | |
287980e4 | 532 | if (p9_is_proto_dotu(c) && ecode < 512) |
ca41bb3e | 533 | err = -ecode; |
4f7ebe80 | 534 | |
287980e4 | 535 | if (!err) { |
ca41bb3e | 536 | err = p9_errstr2errno(ename, strlen(ename)); |
4f7ebe80 | 537 | |
5d385153 JP |
538 | p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", |
539 | -ecode, ename); | |
4f7ebe80 | 540 | } |
abfa034e | 541 | kfree(ename); |
ca41bb3e | 542 | } else { |
523adb6c | 543 | err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); |
ca41bb3e VJJ |
544 | err = -ecode; |
545 | ||
5d385153 | 546 | p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); |
ca41bb3e | 547 | } |
51a87c55 | 548 | |
51a87c55 | 549 | return err; |
4f7ebe80 AB |
550 | |
551 | out_err: | |
5d385153 | 552 | p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); |
4f7ebe80 AB |
553 | |
554 | return err; | |
51a87c55 EVH |
555 | } |
556 | ||
abfa034e AK |
557 | /** |
558 | * p9_check_zc_errors - check 9p packet for error return and process it | |
559 | * @c: current client instance | |
560 | * @req: request to parse and check for error conditions | |
760b3d61 | 561 | * @uidata: external buffer containing error |
abfa034e AK |
562 | * @in_hdrlen: Size of response protocol buffer. |
563 | * | |
564 | * returns error code if one is discovered, otherwise returns 0 | |
565 | * | |
566 | * this will have to be more complicated if we have multiple | |
567 | * error packet types | |
568 | */ | |
569 | ||
570 | static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req, | |
4f3b35c1 | 571 | struct iov_iter *uidata, int in_hdrlen) |
abfa034e AK |
572 | { |
573 | int err; | |
574 | int ecode; | |
575 | int8_t type; | |
576 | char *ename = NULL; | |
577 | ||
523adb6c | 578 | err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); |
348b5901 AK |
579 | /* |
580 | * dump the response from server | |
581 | * This should be after parse_header which poplulate pdu_fcall. | |
582 | */ | |
523adb6c | 583 | trace_9p_protocol_dump(c, &req->rc); |
abfa034e | 584 | if (err) { |
5d385153 | 585 | p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); |
abfa034e AK |
586 | return err; |
587 | } | |
588 | ||
589 | if (type != P9_RERROR && type != P9_RLERROR) | |
590 | return 0; | |
591 | ||
592 | if (!p9_is_proto_dotl(c)) { | |
593 | /* Error is reported in string format */ | |
42fe6484 AK |
594 | int len; |
595 | /* 7 = header size for RERROR; */ | |
596 | int inline_len = in_hdrlen - 7; | |
abfa034e | 597 | |
523adb6c | 598 | len = req->rc.size - req->rc.offset; |
42fe6484 AK |
599 | if (len > (P9_ZC_HDR_SZ - 7)) { |
600 | err = -EFAULT; | |
abfa034e AK |
601 | goto out_err; |
602 | } | |
abfa034e | 603 | |
523adb6c | 604 | ename = &req->rc.sdata[req->rc.offset]; |
42fe6484 AK |
605 | if (len > inline_len) { |
606 | /* We have error in external buffer */ | |
1c512a7c AV |
607 | if (!copy_from_iter_full(ename + inline_len, |
608 | len - inline_len, uidata)) { | |
4f3b35c1 AV |
609 | err = -EFAULT; |
610 | goto out_err; | |
abfa034e AK |
611 | } |
612 | } | |
42fe6484 | 613 | ename = NULL; |
523adb6c | 614 | err = p9pdu_readf(&req->rc, c->proto_version, "s?d", |
42fe6484 AK |
615 | &ename, &ecode); |
616 | if (err) | |
617 | goto out_err; | |
618 | ||
287980e4 | 619 | if (p9_is_proto_dotu(c) && ecode < 512) |
abfa034e | 620 | err = -ecode; |
42fe6484 | 621 | |
287980e4 | 622 | if (!err) { |
abfa034e AK |
623 | err = p9_errstr2errno(ename, strlen(ename)); |
624 | ||
5d385153 JP |
625 | p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", |
626 | -ecode, ename); | |
abfa034e AK |
627 | } |
628 | kfree(ename); | |
629 | } else { | |
523adb6c | 630 | err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); |
abfa034e AK |
631 | err = -ecode; |
632 | ||
5d385153 | 633 | p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); |
abfa034e AK |
634 | } |
635 | return err; | |
636 | ||
abfa034e | 637 | out_err: |
5d385153 | 638 | p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); |
abfa034e AK |
639 | return err; |
640 | } | |
641 | ||
aca00763 RL |
642 | static struct p9_req_t * |
643 | p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); | |
644 | ||
51a87c55 EVH |
645 | /** |
646 | * p9_client_flush - flush (cancel) a request | |
0e15597e AK |
647 | * @c: client state |
648 | * @oldreq: request to cancel | |
51a87c55 | 649 | * |
aca00763 | 650 | * This sents a flush for a particular request and links |
51a87c55 EVH |
651 | * the flush request to the original request. The current |
652 | * code only supports a single flush request although the protocol | |
653 | * allows for multiple flush requests to be sent for a single request. | |
654 | * | |
655 | */ | |
656 | ||
657 | static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) | |
658 | { | |
659 | struct p9_req_t *req; | |
660 | int16_t oldtag; | |
661 | int err; | |
662 | ||
523adb6c | 663 | err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1); |
51a87c55 EVH |
664 | if (err) |
665 | return err; | |
666 | ||
5d385153 | 667 | p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); |
51a87c55 EVH |
668 | |
669 | req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); | |
670 | if (IS_ERR(req)) | |
671 | return PTR_ERR(req); | |
672 | ||
1cff3306 SD |
673 | /* |
674 | * if we haven't received a response for oldreq, | |
60ff779c | 675 | * remove it from the list |
1cff3306 | 676 | */ |
728356de | 677 | if (oldreq->status == REQ_STATUS_SENT) { |
afd8d654 SD |
678 | if (c->trans_mod->cancelled) |
679 | c->trans_mod->cancelled(c, oldreq); | |
728356de | 680 | } |
1bab88b2 | 681 | |
43cbcbee | 682 | p9_tag_remove(c, req); |
51a87c55 EVH |
683 | return 0; |
684 | } | |
685 | ||
abfa034e AK |
686 | static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, |
687 | int8_t type, int req_size, | |
688 | const char *fmt, va_list ap) | |
91b8534f | 689 | { |
996d5b4d | 690 | int err; |
91b8534f | 691 | struct p9_req_t *req; |
91b8534f | 692 | |
5d385153 | 693 | p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); |
91b8534f | 694 | |
6d96d3ab AK |
695 | /* we allow for any status other than disconnected */ |
696 | if (c->status == Disconnected) | |
697 | return ERR_PTR(-EIO); | |
698 | ||
699 | /* if status is begin_disconnected we allow only clunk request */ | |
700 | if ((c->status == BeginDisconnect) && (type != P9_TCLUNK)) | |
51a87c55 | 701 | return ERR_PTR(-EIO); |
91b8534f | 702 | |
996d5b4d | 703 | req = p9_tag_alloc(c, type, req_size); |
51a87c55 EVH |
704 | if (IS_ERR(req)) |
705 | return req; | |
91b8534f | 706 | |
51a87c55 | 707 | /* marshall the data */ |
523adb6c DM |
708 | p9pdu_prepare(&req->tc, req->tc.tag, type); |
709 | err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap); | |
7b3bb3fe AK |
710 | if (err) |
711 | goto reterr; | |
523adb6c DM |
712 | p9pdu_finalize(c, &req->tc); |
713 | trace_9p_client_req(c, type, req->tc.tag); | |
abfa034e AK |
714 | return req; |
715 | reterr: | |
43cbcbee | 716 | p9_tag_remove(c, req); |
728356de TB |
717 | /* We have to put also the 2nd reference as it won't be used */ |
718 | p9_req_put(req); | |
abfa034e AK |
719 | return ERR_PTR(err); |
720 | } | |
721 | ||
722 | /** | |
723 | * p9_client_rpc - issue a request and wait for a response | |
724 | * @c: client session | |
725 | * @type: type of request | |
726 | * @fmt: protocol format string (see protocol.c) | |
727 | * | |
43cbcbee | 728 | * Returns request structure (which client must free using p9_tag_remove) |
abfa034e AK |
729 | */ |
730 | ||
731 | static struct p9_req_t * | |
732 | p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) | |
733 | { | |
734 | va_list ap; | |
735 | int sigpending, err; | |
736 | unsigned long flags; | |
737 | struct p9_req_t *req; | |
738 | ||
739 | va_start(ap, fmt); | |
740 | req = p9_client_prepare_req(c, type, c->msize, fmt, ap); | |
741 | va_end(ap); | |
742 | if (IS_ERR(req)) | |
743 | return req; | |
744 | ||
745 | if (signal_pending(current)) { | |
746 | sigpending = 1; | |
747 | clear_thread_flag(TIF_SIGPENDING); | |
748 | } else | |
749 | sigpending = 0; | |
91b8534f EVH |
750 | |
751 | err = c->trans_mod->request(c, req); | |
752 | if (err < 0) { | |
728356de TB |
753 | /* write won't happen */ |
754 | p9_req_put(req); | |
3cd79678 | 755 | if (err != -ERESTARTSYS && err != -EFAULT) |
52f44e0d | 756 | c->status = Disconnected; |
a8522243 | 757 | goto recalc_sigpending; |
91b8534f | 758 | } |
a314f274 | 759 | again: |
abfa034e | 760 | /* Wait for the response */ |
2557d0c5 | 761 | err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD); |
91b8534f | 762 | |
2b6e72ed DM |
763 | /* |
764 | * Make sure our req is coherent with regard to updates in other | |
765 | * threads - echoes to wmb() in the callback | |
766 | */ | |
767 | smp_rmb(); | |
768 | ||
a314f274 JG |
769 | if ((err == -ERESTARTSYS) && (c->status == Connected) |
770 | && (type == P9_TFLUSH)) { | |
771 | sigpending = 1; | |
772 | clear_thread_flag(TIF_SIGPENDING); | |
773 | goto again; | |
774 | } | |
775 | ||
91b8534f | 776 | if (req->status == REQ_STATUS_ERROR) { |
5d385153 | 777 | p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); |
91b8534f | 778 | err = req->t_err; |
91b8534f | 779 | } |
1bab88b2 | 780 | if ((err == -ERESTARTSYS) && (c->status == Connected)) { |
5d385153 | 781 | p9_debug(P9_DEBUG_MUX, "flushing\n"); |
91b8534f | 782 | sigpending = 1; |
91b8534f EVH |
783 | clear_thread_flag(TIF_SIGPENDING); |
784 | ||
1bab88b2 LI |
785 | if (c->trans_mod->cancel(c, req)) |
786 | p9_client_flush(c, req); | |
787 | ||
788 | /* if we received the response anyway, don't signal error */ | |
789 | if (req->status == REQ_STATUS_RCVD) | |
790 | err = 0; | |
91b8534f | 791 | } |
a8522243 | 792 | recalc_sigpending: |
91b8534f EVH |
793 | if (sigpending) { |
794 | spin_lock_irqsave(¤t->sighand->siglock, flags); | |
795 | recalc_sigpending(); | |
796 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); | |
797 | } | |
91b8534f EVH |
798 | if (err < 0) |
799 | goto reterr; | |
800 | ||
51a87c55 | 801 | err = p9_check_errors(c, req); |
523adb6c | 802 | trace_9p_client_res(c, type, req->rc.tag, err); |
348b5901 | 803 | if (!err) |
51a87c55 | 804 | return req; |
abfa034e | 805 | reterr: |
43cbcbee | 806 | p9_tag_remove(c, req); |
43def35c | 807 | return ERR_PTR(safe_errno(err)); |
abfa034e AK |
808 | } |
809 | ||
810 | /** | |
811 | * p9_client_zc_rpc - issue a request and wait for a response | |
812 | * @c: client session | |
813 | * @type: type of request | |
4f3b35c1 AV |
814 | * @uidata: destination for zero copy read |
815 | * @uodata: source for zero copy write | |
abfa034e AK |
816 | * @inlen: read buffer size |
817 | * @olen: write buffer size | |
15e522a7 | 818 | * @in_hdrlen: reader header size, This is the size of response protocol data |
abfa034e AK |
819 | * @fmt: protocol format string (see protocol.c) |
820 | * | |
43cbcbee | 821 | * Returns request structure (which client must free using p9_tag_remove) |
abfa034e AK |
822 | */ |
823 | static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, | |
4f3b35c1 AV |
824 | struct iov_iter *uidata, |
825 | struct iov_iter *uodata, | |
abfa034e | 826 | int inlen, int olen, int in_hdrlen, |
4f3b35c1 | 827 | const char *fmt, ...) |
abfa034e AK |
828 | { |
829 | va_list ap; | |
830 | int sigpending, err; | |
831 | unsigned long flags; | |
832 | struct p9_req_t *req; | |
833 | ||
834 | va_start(ap, fmt); | |
835 | /* | |
836 | * We allocate a inline protocol data of only 4k bytes. | |
837 | * The actual content is passed in zero-copy fashion. | |
838 | */ | |
839 | req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap); | |
840 | va_end(ap); | |
841 | if (IS_ERR(req)) | |
842 | return req; | |
843 | ||
844 | if (signal_pending(current)) { | |
845 | sigpending = 1; | |
846 | clear_thread_flag(TIF_SIGPENDING); | |
847 | } else | |
848 | sigpending = 0; | |
849 | ||
abfa034e | 850 | err = c->trans_mod->zc_request(c, req, uidata, uodata, |
4f3b35c1 | 851 | inlen, olen, in_hdrlen); |
abfa034e AK |
852 | if (err < 0) { |
853 | if (err == -EIO) | |
854 | c->status = Disconnected; | |
a84b69cb | 855 | if (err != -ERESTARTSYS) |
a8522243 | 856 | goto recalc_sigpending; |
abfa034e AK |
857 | } |
858 | if (req->status == REQ_STATUS_ERROR) { | |
5d385153 | 859 | p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); |
abfa034e AK |
860 | err = req->t_err; |
861 | } | |
862 | if ((err == -ERESTARTSYS) && (c->status == Connected)) { | |
5d385153 | 863 | p9_debug(P9_DEBUG_MUX, "flushing\n"); |
abfa034e AK |
864 | sigpending = 1; |
865 | clear_thread_flag(TIF_SIGPENDING); | |
91b8534f | 866 | |
abfa034e AK |
867 | if (c->trans_mod->cancel(c, req)) |
868 | p9_client_flush(c, req); | |
869 | ||
870 | /* if we received the response anyway, don't signal error */ | |
871 | if (req->status == REQ_STATUS_RCVD) | |
872 | err = 0; | |
873 | } | |
a8522243 | 874 | recalc_sigpending: |
abfa034e AK |
875 | if (sigpending) { |
876 | spin_lock_irqsave(¤t->sighand->siglock, flags); | |
877 | recalc_sigpending(); | |
878 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); | |
879 | } | |
880 | if (err < 0) | |
881 | goto reterr; | |
882 | ||
4f3b35c1 | 883 | err = p9_check_zc_errors(c, req, uidata, in_hdrlen); |
523adb6c | 884 | trace_9p_client_res(c, type, req->rc.tag, err); |
348b5901 | 885 | if (!err) |
abfa034e | 886 | return req; |
91b8534f | 887 | reterr: |
43cbcbee | 888 | p9_tag_remove(c, req); |
43def35c | 889 | return ERR_PTR(safe_errno(err)); |
91b8534f EVH |
890 | } |
891 | ||
5503ac56 EVH |
892 | static struct p9_fid *p9_fid_create(struct p9_client *clnt) |
893 | { | |
9f3e9bbe | 894 | int ret; |
5503ac56 EVH |
895 | struct p9_fid *fid; |
896 | ||
5d385153 | 897 | p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); |
5503ac56 EVH |
898 | fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); |
899 | if (!fid) | |
b5303be2 | 900 | return NULL; |
5503ac56 | 901 | |
5503ac56 EVH |
902 | memset(&fid->qid, 0, sizeof(struct p9_qid)); |
903 | fid->mode = -1; | |
f8b9d53a | 904 | fid->uid = current_fsuid(); |
5503ac56 | 905 | fid->clnt = clnt; |
3e2796a9 | 906 | fid->rdir = NULL; |
f28cdf04 | 907 | fid->fid = 0; |
ff5e72eb | 908 | refcount_set(&fid->count, 1); |
5503ac56 | 909 | |
f28cdf04 MW |
910 | idr_preload(GFP_KERNEL); |
911 | spin_lock_irq(&clnt->lock); | |
912 | ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1, | |
913 | GFP_NOWAIT); | |
914 | spin_unlock_irq(&clnt->lock); | |
915 | idr_preload_end(); | |
f28cdf04 MW |
916 | if (!ret) |
917 | return fid; | |
5503ac56 | 918 | |
5503ac56 | 919 | kfree(fid); |
b5303be2 | 920 | return NULL; |
5503ac56 EVH |
921 | } |
922 | ||
923 | static void p9_fid_destroy(struct p9_fid *fid) | |
924 | { | |
925 | struct p9_client *clnt; | |
cac23d65 | 926 | unsigned long flags; |
5503ac56 | 927 | |
5d385153 | 928 | p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); |
5503ac56 | 929 | clnt = fid->clnt; |
cac23d65 | 930 | spin_lock_irqsave(&clnt->lock, flags); |
f28cdf04 | 931 | idr_remove(&clnt->fids, fid->fid); |
cac23d65 | 932 | spin_unlock_irqrestore(&clnt->lock, flags); |
3e2796a9 | 933 | kfree(fid->rdir); |
5503ac56 EVH |
934 | kfree(fid); |
935 | } | |
8a0dc95f | 936 | |
32a875ad | 937 | static int p9_client_version(struct p9_client *c) |
bd238fb4 | 938 | { |
6936bf60 | 939 | int err = 0; |
51a87c55 | 940 | struct p9_req_t *req; |
7913690d | 941 | char *version = NULL; |
51a87c55 | 942 | int msize; |
bd238fb4 | 943 | |
5d385153 JP |
944 | p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", |
945 | c->msize, c->proto_version); | |
c5a7697d SK |
946 | |
947 | switch (c->proto_version) { | |
45bc21ed | 948 | case p9_proto_2000L: |
c5a7697d | 949 | req = p9_client_rpc(c, P9_TVERSION, "ds", |
45bc21ed | 950 | c->msize, "9P2000.L"); |
c5a7697d SK |
951 | break; |
952 | case p9_proto_2000u: | |
953 | req = p9_client_rpc(c, P9_TVERSION, "ds", | |
954 | c->msize, "9P2000.u"); | |
955 | break; | |
956 | case p9_proto_legacy: | |
957 | req = p9_client_rpc(c, P9_TVERSION, "ds", | |
958 | c->msize, "9P2000"); | |
959 | break; | |
960 | default: | |
961 | return -EINVAL; | |
c5a7697d SK |
962 | } |
963 | ||
51a87c55 EVH |
964 | if (IS_ERR(req)) |
965 | return PTR_ERR(req); | |
6936bf60 | 966 | |
523adb6c | 967 | err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version); |
51a87c55 | 968 | if (err) { |
5d385153 | 969 | p9_debug(P9_DEBUG_9P, "version error %d\n", err); |
523adb6c | 970 | trace_9p_protocol_dump(c, &req->rc); |
6936bf60 | 971 | goto error; |
51a87c55 | 972 | } |
6936bf60 | 973 | |
5d385153 | 974 | p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); |
45bc21ed SK |
975 | if (!strncmp(version, "9P2000.L", 8)) |
976 | c->proto_version = p9_proto_2000L; | |
c5a7697d | 977 | else if (!strncmp(version, "9P2000.u", 8)) |
342fee1d SK |
978 | c->proto_version = p9_proto_2000u; |
979 | else if (!strncmp(version, "9P2000", 6)) | |
980 | c->proto_version = p9_proto_legacy; | |
6936bf60 | 981 | else { |
574d356b DM |
982 | p9_debug(P9_DEBUG_ERROR, |
983 | "server returned an unknown version: %s\n", version); | |
6936bf60 EVH |
984 | err = -EREMOTEIO; |
985 | goto error; | |
986 | } | |
987 | ||
574d356b DM |
988 | if (msize < 4096) { |
989 | p9_debug(P9_DEBUG_ERROR, | |
990 | "server returned a msize < 4096: %d\n", msize); | |
991 | err = -EREMOTEIO; | |
992 | goto error; | |
993 | } | |
51a87c55 EVH |
994 | if (msize < c->msize) |
995 | c->msize = msize; | |
6936bf60 EVH |
996 | |
997 | error: | |
51a87c55 | 998 | kfree(version); |
43cbcbee | 999 | p9_tag_remove(c, req); |
6936bf60 EVH |
1000 | |
1001 | return err; | |
1002 | } | |
6936bf60 EVH |
1003 | |
1004 | struct p9_client *p9_client_create(const char *dev_name, char *options) | |
1005 | { | |
1006 | int err; | |
1007 | struct p9_client *clnt; | |
50192abe | 1008 | char *client_id; |
6936bf60 EVH |
1009 | |
1010 | err = 0; | |
bd238fb4 LI |
1011 | clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); |
1012 | if (!clnt) | |
1013 | return ERR_PTR(-ENOMEM); | |
1014 | ||
72029fe8 | 1015 | clnt->trans_mod = NULL; |
bb8ffdfc | 1016 | clnt->trans = NULL; |
91a76be3 | 1017 | clnt->fcall_cache = NULL; |
50192abe WD |
1018 | |
1019 | client_id = utsname()->nodename; | |
1020 | memcpy(clnt->name, client_id, strlen(client_id) + 1); | |
1021 | ||
bd238fb4 | 1022 | spin_lock_init(&clnt->lock); |
f28cdf04 | 1023 | idr_init(&clnt->fids); |
996d5b4d | 1024 | idr_init(&clnt->reqs); |
fea511a6 | 1025 | |
bb8ffdfc EVH |
1026 | err = parse_opts(options, clnt); |
1027 | if (err < 0) | |
996d5b4d | 1028 | goto free_client; |
bb8ffdfc | 1029 | |
a17d1720 AK |
1030 | if (!clnt->trans_mod) |
1031 | clnt->trans_mod = v9fs_get_default_trans(); | |
1032 | ||
8a0dc95f EVH |
1033 | if (clnt->trans_mod == NULL) { |
1034 | err = -EPROTONOSUPPORT; | |
5d385153 JP |
1035 | p9_debug(P9_DEBUG_ERROR, |
1036 | "No transport defined or default transport\n"); | |
996d5b4d | 1037 | goto free_client; |
8781ff94 EVH |
1038 | } |
1039 | ||
5d385153 JP |
1040 | p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", |
1041 | clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); | |
8a0dc95f | 1042 | |
8b81ef58 EVH |
1043 | err = clnt->trans_mod->create(clnt, dev_name, options); |
1044 | if (err) | |
f28cdf04 | 1045 | goto put_trans; |
bd238fb4 | 1046 | |
c9ffb05c VJJ |
1047 | if (clnt->msize > clnt->trans_mod->maxsize) |
1048 | clnt->msize = clnt->trans_mod->maxsize; | |
8a0dc95f | 1049 | |
574d356b DM |
1050 | if (clnt->msize < 4096) { |
1051 | p9_debug(P9_DEBUG_ERROR, | |
1052 | "Please specify a msize of at least 4k\n"); | |
1053 | err = -EINVAL; | |
bb06c388 | 1054 | goto close_trans; |
574d356b DM |
1055 | } |
1056 | ||
6936bf60 | 1057 | err = p9_client_version(clnt); |
bd238fb4 | 1058 | if (err) |
8781ff94 | 1059 | goto close_trans; |
bd238fb4 | 1060 | |
91a76be3 DM |
1061 | /* P9_HDRSZ + 4 is the smallest packet header we can have that is |
1062 | * followed by data accessed from userspace by read | |
1063 | */ | |
1064 | clnt->fcall_cache = | |
1065 | kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize, | |
1066 | 0, 0, P9_HDRSZ + 4, | |
1067 | clnt->msize - (P9_HDRSZ + 4), | |
1068 | NULL); | |
1069 | ||
bd238fb4 LI |
1070 | return clnt; |
1071 | ||
8781ff94 EVH |
1072 | close_trans: |
1073 | clnt->trans_mod->close(clnt); | |
8781ff94 EVH |
1074 | put_trans: |
1075 | v9fs_put_trans(clnt->trans_mod); | |
1076 | free_client: | |
1077 | kfree(clnt); | |
bd238fb4 LI |
1078 | return ERR_PTR(err); |
1079 | } | |
1080 | EXPORT_SYMBOL(p9_client_create); | |
1081 | ||
1082 | void p9_client_destroy(struct p9_client *clnt) | |
1083 | { | |
f28cdf04 MW |
1084 | struct p9_fid *fid; |
1085 | int id; | |
bd238fb4 | 1086 | |
5d385153 | 1087 | p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); |
bd238fb4 | 1088 | |
8b81ef58 EVH |
1089 | if (clnt->trans_mod) |
1090 | clnt->trans_mod->close(clnt); | |
bd238fb4 | 1091 | |
72029fe8 TH |
1092 | v9fs_put_trans(clnt->trans_mod); |
1093 | ||
f28cdf04 | 1094 | idr_for_each_entry(&clnt->fids, fid, id) { |
5d385153 | 1095 | pr_info("Found fid %d not clunked\n", fid->fid); |
bd238fb4 | 1096 | p9_fid_destroy(fid); |
6d96d3ab | 1097 | } |
bd238fb4 | 1098 | |
fea511a6 EVH |
1099 | p9_tag_cleanup(clnt); |
1100 | ||
91a76be3 | 1101 | kmem_cache_destroy(clnt->fcall_cache); |
bd238fb4 LI |
1102 | kfree(clnt); |
1103 | } | |
1104 | EXPORT_SYMBOL(p9_client_destroy); | |
1105 | ||
1106 | void p9_client_disconnect(struct p9_client *clnt) | |
1107 | { | |
5d385153 | 1108 | p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); |
8b81ef58 | 1109 | clnt->status = Disconnected; |
bd238fb4 LI |
1110 | } |
1111 | EXPORT_SYMBOL(p9_client_disconnect); | |
1112 | ||
6d96d3ab AK |
1113 | void p9_client_begin_disconnect(struct p9_client *clnt) |
1114 | { | |
5d385153 | 1115 | p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); |
6d96d3ab AK |
1116 | clnt->status = BeginDisconnect; |
1117 | } | |
1118 | EXPORT_SYMBOL(p9_client_begin_disconnect); | |
1119 | ||
bd238fb4 | 1120 | struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, |
7880b43b | 1121 | const char *uname, kuid_t n_uname, const char *aname) |
bd238fb4 | 1122 | { |
348b5901 | 1123 | int err = 0; |
51a87c55 | 1124 | struct p9_req_t *req; |
bd238fb4 | 1125 | struct p9_fid *fid; |
51a87c55 | 1126 | struct p9_qid qid; |
bd238fb4 | 1127 | |
bd238fb4 | 1128 | |
5d385153 JP |
1129 | p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", |
1130 | afid ? afid->fid : -1, uname, aname); | |
bd238fb4 | 1131 | fid = p9_fid_create(clnt); |
b5303be2 MW |
1132 | if (!fid) { |
1133 | err = -ENOMEM; | |
bd238fb4 LI |
1134 | goto error; |
1135 | } | |
21c9f5cc | 1136 | fid->uid = n_uname; |
bd238fb4 | 1137 | |
f791f7c5 | 1138 | req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, |
51a87c55 EVH |
1139 | afid ? afid->fid : P9_NOFID, uname, aname, n_uname); |
1140 | if (IS_ERR(req)) { | |
1141 | err = PTR_ERR(req); | |
bd238fb4 LI |
1142 | goto error; |
1143 | } | |
1144 | ||
523adb6c | 1145 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid); |
51a87c55 | 1146 | if (err) { |
523adb6c | 1147 | trace_9p_protocol_dump(clnt, &req->rc); |
43cbcbee | 1148 | p9_tag_remove(clnt, req); |
bd238fb4 | 1149 | goto error; |
51a87c55 | 1150 | } |
bd238fb4 | 1151 | |
5d385153 JP |
1152 | p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", |
1153 | qid.type, (unsigned long long)qid.path, qid.version); | |
51a87c55 EVH |
1154 | |
1155 | memmove(&fid->qid, &qid, sizeof(struct p9_qid)); | |
1156 | ||
43cbcbee | 1157 | p9_tag_remove(clnt, req); |
bd238fb4 LI |
1158 | return fid; |
1159 | ||
1160 | error: | |
bd238fb4 LI |
1161 | if (fid) |
1162 | p9_fid_destroy(fid); | |
1163 | return ERR_PTR(err); | |
1164 | } | |
1165 | EXPORT_SYMBOL(p9_client_attach); | |
1166 | ||
b76225e2 | 1167 | struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, |
7880b43b | 1168 | const unsigned char * const *wnames, int clone) |
bd238fb4 LI |
1169 | { |
1170 | int err; | |
bd238fb4 LI |
1171 | struct p9_client *clnt; |
1172 | struct p9_fid *fid; | |
51a87c55 EVH |
1173 | struct p9_qid *wqids; |
1174 | struct p9_req_t *req; | |
b76225e2 | 1175 | uint16_t nwqids, count; |
bd238fb4 | 1176 | |
bd238fb4 | 1177 | err = 0; |
62b2be59 | 1178 | wqids = NULL; |
bd238fb4 LI |
1179 | clnt = oldfid->clnt; |
1180 | if (clone) { | |
1181 | fid = p9_fid_create(clnt); | |
b5303be2 MW |
1182 | if (!fid) { |
1183 | err = -ENOMEM; | |
bd238fb4 LI |
1184 | goto error; |
1185 | } | |
1186 | ||
1187 | fid->uid = oldfid->uid; | |
1188 | } else | |
1189 | fid = oldfid; | |
1190 | ||
51a87c55 | 1191 | |
5d385153 JP |
1192 | p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", |
1193 | oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); | |
51a87c55 EVH |
1194 | req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, |
1195 | nwname, wnames); | |
1196 | if (IS_ERR(req)) { | |
1197 | err = PTR_ERR(req); | |
bd238fb4 LI |
1198 | goto error; |
1199 | } | |
1200 | ||
523adb6c | 1201 | err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids); |
e7f4b8f1 | 1202 | if (err) { |
523adb6c | 1203 | trace_9p_protocol_dump(clnt, &req->rc); |
43cbcbee | 1204 | p9_tag_remove(clnt, req); |
51a87c55 | 1205 | goto clunk_fid; |
e7f4b8f1 | 1206 | } |
43cbcbee | 1207 | p9_tag_remove(clnt, req); |
bd238fb4 | 1208 | |
5d385153 | 1209 | p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); |
51a87c55 EVH |
1210 | |
1211 | if (nwqids != nwname) { | |
bd238fb4 LI |
1212 | err = -ENOENT; |
1213 | goto clunk_fid; | |
1214 | } | |
1215 | ||
51a87c55 | 1216 | for (count = 0; count < nwqids; count++) |
5d385153 | 1217 | p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", |
b0d5fdef RD |
1218 | count, wqids[count].type, |
1219 | (unsigned long long)wqids[count].path, | |
51a87c55 EVH |
1220 | wqids[count].version); |
1221 | ||
bd238fb4 | 1222 | if (nwname) |
51a87c55 | 1223 | memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); |
bd238fb4 | 1224 | else |
154372e6 | 1225 | memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid)); |
bd238fb4 | 1226 | |
62b2be59 | 1227 | kfree(wqids); |
bd238fb4 LI |
1228 | return fid; |
1229 | ||
1230 | clunk_fid: | |
62b2be59 | 1231 | kfree(wqids); |
51a87c55 EVH |
1232 | p9_client_clunk(fid); |
1233 | fid = NULL; | |
bd238fb4 LI |
1234 | |
1235 | error: | |
bd238fb4 LI |
1236 | if (fid && (fid != oldfid)) |
1237 | p9_fid_destroy(fid); | |
1238 | ||
1239 | return ERR_PTR(err); | |
1240 | } | |
1241 | EXPORT_SYMBOL(p9_client_walk); | |
1242 | ||
1243 | int p9_client_open(struct p9_fid *fid, int mode) | |
1244 | { | |
1245 | int err; | |
bd238fb4 | 1246 | struct p9_client *clnt; |
51a87c55 EVH |
1247 | struct p9_req_t *req; |
1248 | struct p9_qid qid; | |
1249 | int iounit; | |
bd238fb4 | 1250 | |
bd238fb4 | 1251 | clnt = fid->clnt; |
5d385153 | 1252 | p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", |
ef56547e MK |
1253 | p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); |
1254 | err = 0; | |
bd238fb4 LI |
1255 | |
1256 | if (fid->mode != -1) | |
1257 | return -EINVAL; | |
1258 | ||
ef56547e MK |
1259 | if (p9_is_proto_dotl(clnt)) |
1260 | req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); | |
1261 | else | |
1262 | req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); | |
51a87c55 EVH |
1263 | if (IS_ERR(req)) { |
1264 | err = PTR_ERR(req); | |
1265 | goto error; | |
bd238fb4 LI |
1266 | } |
1267 | ||
523adb6c | 1268 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); |
e7f4b8f1 | 1269 | if (err) { |
523adb6c | 1270 | trace_9p_protocol_dump(clnt, &req->rc); |
e7f4b8f1 EVH |
1271 | goto free_and_error; |
1272 | } | |
51a87c55 | 1273 | |
5d385153 | 1274 | p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", |
ef56547e MK |
1275 | p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, |
1276 | (unsigned long long)qid.path, qid.version, iounit); | |
bd238fb4 | 1277 | |
154372e6 | 1278 | memmove(&fid->qid, &qid, sizeof(struct p9_qid)); |
bd238fb4 | 1279 | fid->mode = mode; |
51a87c55 | 1280 | fid->iounit = iounit; |
bd238fb4 | 1281 | |
e7f4b8f1 | 1282 | free_and_error: |
43cbcbee | 1283 | p9_tag_remove(clnt, req); |
51a87c55 | 1284 | error: |
bd238fb4 LI |
1285 | return err; |
1286 | } | |
1287 | EXPORT_SYMBOL(p9_client_open); | |
1288 | ||
7880b43b | 1289 | int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode, |
f791f7c5 | 1290 | kgid_t gid, struct p9_qid *qid) |
5643135a VJJ |
1291 | { |
1292 | int err = 0; | |
1293 | struct p9_client *clnt; | |
1294 | struct p9_req_t *req; | |
1295 | int iounit; | |
1296 | ||
5d385153 | 1297 | p9_debug(P9_DEBUG_9P, |
5643135a | 1298 | ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", |
f791f7c5 EB |
1299 | ofid->fid, name, flags, mode, |
1300 | from_kgid(&init_user_ns, gid)); | |
5643135a VJJ |
1301 | clnt = ofid->clnt; |
1302 | ||
1303 | if (ofid->mode != -1) | |
1304 | return -EINVAL; | |
1305 | ||
f791f7c5 | 1306 | req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, |
5643135a VJJ |
1307 | mode, gid); |
1308 | if (IS_ERR(req)) { | |
1309 | err = PTR_ERR(req); | |
1310 | goto error; | |
1311 | } | |
1312 | ||
523adb6c | 1313 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit); |
5643135a | 1314 | if (err) { |
523adb6c | 1315 | trace_9p_protocol_dump(clnt, &req->rc); |
5643135a VJJ |
1316 | goto free_and_error; |
1317 | } | |
1318 | ||
5d385153 | 1319 | p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", |
5643135a VJJ |
1320 | qid->type, |
1321 | (unsigned long long)qid->path, | |
1322 | qid->version, iounit); | |
1323 | ||
154372e6 | 1324 | memmove(&ofid->qid, qid, sizeof(struct p9_qid)); |
5643135a VJJ |
1325 | ofid->mode = mode; |
1326 | ofid->iounit = iounit; | |
1327 | ||
1328 | free_and_error: | |
43cbcbee | 1329 | p9_tag_remove(clnt, req); |
5643135a VJJ |
1330 | error: |
1331 | return err; | |
1332 | } | |
1333 | EXPORT_SYMBOL(p9_client_create_dotl); | |
1334 | ||
7880b43b | 1335 | int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, |
bd238fb4 LI |
1336 | char *extension) |
1337 | { | |
1338 | int err; | |
bd238fb4 | 1339 | struct p9_client *clnt; |
51a87c55 EVH |
1340 | struct p9_req_t *req; |
1341 | struct p9_qid qid; | |
1342 | int iounit; | |
bd238fb4 | 1343 | |
5d385153 | 1344 | p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", |
51a87c55 | 1345 | fid->fid, name, perm, mode); |
bd238fb4 | 1346 | err = 0; |
bd238fb4 LI |
1347 | clnt = fid->clnt; |
1348 | ||
1349 | if (fid->mode != -1) | |
1350 | return -EINVAL; | |
1351 | ||
51a87c55 EVH |
1352 | req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, |
1353 | mode, extension); | |
1354 | if (IS_ERR(req)) { | |
1355 | err = PTR_ERR(req); | |
1356 | goto error; | |
bd238fb4 LI |
1357 | } |
1358 | ||
523adb6c | 1359 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); |
e7f4b8f1 | 1360 | if (err) { |
523adb6c | 1361 | trace_9p_protocol_dump(clnt, &req->rc); |
e7f4b8f1 EVH |
1362 | goto free_and_error; |
1363 | } | |
51a87c55 | 1364 | |
5d385153 | 1365 | p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", |
b0d5fdef RD |
1366 | qid.type, |
1367 | (unsigned long long)qid.path, | |
1368 | qid.version, iounit); | |
bd238fb4 | 1369 | |
154372e6 | 1370 | memmove(&fid->qid, &qid, sizeof(struct p9_qid)); |
bd238fb4 | 1371 | fid->mode = mode; |
51a87c55 | 1372 | fid->iounit = iounit; |
bd238fb4 | 1373 | |
e7f4b8f1 | 1374 | free_and_error: |
43cbcbee | 1375 | p9_tag_remove(clnt, req); |
51a87c55 | 1376 | error: |
bd238fb4 LI |
1377 | return err; |
1378 | } | |
1379 | EXPORT_SYMBOL(p9_client_fcreate); | |
1380 | ||
7880b43b AV |
1381 | int p9_client_symlink(struct p9_fid *dfid, const char *name, |
1382 | const char *symtgt, kgid_t gid, struct p9_qid *qid) | |
50cc42ff VJJ |
1383 | { |
1384 | int err = 0; | |
1385 | struct p9_client *clnt; | |
1386 | struct p9_req_t *req; | |
1387 | ||
5d385153 | 1388 | p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", |
50cc42ff VJJ |
1389 | dfid->fid, name, symtgt); |
1390 | clnt = dfid->clnt; | |
1391 | ||
f791f7c5 | 1392 | req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, |
50cc42ff VJJ |
1393 | gid); |
1394 | if (IS_ERR(req)) { | |
1395 | err = PTR_ERR(req); | |
1396 | goto error; | |
1397 | } | |
1398 | ||
523adb6c | 1399 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); |
50cc42ff | 1400 | if (err) { |
523adb6c | 1401 | trace_9p_protocol_dump(clnt, &req->rc); |
50cc42ff VJJ |
1402 | goto free_and_error; |
1403 | } | |
1404 | ||
5d385153 | 1405 | p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", |
50cc42ff VJJ |
1406 | qid->type, (unsigned long long)qid->path, qid->version); |
1407 | ||
1408 | free_and_error: | |
43cbcbee | 1409 | p9_tag_remove(clnt, req); |
50cc42ff VJJ |
1410 | error: |
1411 | return err; | |
1412 | } | |
1413 | EXPORT_SYMBOL(p9_client_symlink); | |
1414 | ||
7880b43b | 1415 | int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) |
652df9a7 VJJ |
1416 | { |
1417 | struct p9_client *clnt; | |
1418 | struct p9_req_t *req; | |
1419 | ||
5d385153 | 1420 | p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", |
652df9a7 VJJ |
1421 | dfid->fid, oldfid->fid, newname); |
1422 | clnt = dfid->clnt; | |
1423 | req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, | |
1424 | newname); | |
1425 | if (IS_ERR(req)) | |
1426 | return PTR_ERR(req); | |
1427 | ||
5d385153 | 1428 | p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); |
43cbcbee | 1429 | p9_tag_remove(clnt, req); |
652df9a7 VJJ |
1430 | return 0; |
1431 | } | |
1432 | EXPORT_SYMBOL(p9_client_link); | |
1433 | ||
b165d601 | 1434 | int p9_client_fsync(struct p9_fid *fid, int datasync) |
920e65dc VJJ |
1435 | { |
1436 | int err; | |
1437 | struct p9_client *clnt; | |
1438 | struct p9_req_t *req; | |
1439 | ||
5d385153 | 1440 | p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", |
b165d601 | 1441 | fid->fid, datasync); |
920e65dc VJJ |
1442 | err = 0; |
1443 | clnt = fid->clnt; | |
1444 | ||
b165d601 | 1445 | req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); |
920e65dc VJJ |
1446 | if (IS_ERR(req)) { |
1447 | err = PTR_ERR(req); | |
1448 | goto error; | |
1449 | } | |
1450 | ||
5d385153 | 1451 | p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); |
920e65dc | 1452 | |
43cbcbee | 1453 | p9_tag_remove(clnt, req); |
920e65dc VJJ |
1454 | |
1455 | error: | |
1456 | return err; | |
1457 | } | |
1458 | EXPORT_SYMBOL(p9_client_fsync); | |
1459 | ||
bd238fb4 LI |
1460 | int p9_client_clunk(struct p9_fid *fid) |
1461 | { | |
1462 | int err; | |
bd238fb4 | 1463 | struct p9_client *clnt; |
51a87c55 | 1464 | struct p9_req_t *req; |
208f3c28 | 1465 | int retries = 0; |
bd238fb4 | 1466 | |
6636b6dc JW |
1467 | if (!fid || IS_ERR(fid)) { |
1468 | pr_warn("%s (%d): Trying to clunk with invalid fid\n", | |
5d385153 | 1469 | __func__, task_pid_nr(current)); |
8e44a080 | 1470 | dump_stack(); |
1471 | return 0; | |
1472 | } | |
ff5e72eb | 1473 | if (!refcount_dec_and_test(&fid->count)) |
6636b6dc | 1474 | return 0; |
8e44a080 | 1475 | |
208f3c28 JG |
1476 | again: |
1477 | p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid, | |
1478 | retries); | |
bd238fb4 | 1479 | err = 0; |
bd238fb4 LI |
1480 | clnt = fid->clnt; |
1481 | ||
51a87c55 EVH |
1482 | req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); |
1483 | if (IS_ERR(req)) { | |
1484 | err = PTR_ERR(req); | |
1485 | goto error; | |
bd238fb4 LI |
1486 | } |
1487 | ||
5d385153 | 1488 | p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); |
bd238fb4 | 1489 | |
43cbcbee | 1490 | p9_tag_remove(clnt, req); |
51a87c55 | 1491 | error: |
5034990e AK |
1492 | /* |
1493 | * Fid is not valid even after a failed clunk | |
208f3c28 JG |
1494 | * If interrupted, retry once then give up and |
1495 | * leak fid until umount. | |
5034990e | 1496 | */ |
208f3c28 JG |
1497 | if (err == -ERESTARTSYS) { |
1498 | if (retries++ == 0) | |
1499 | goto again; | |
1500 | } else | |
1501 | p9_fid_destroy(fid); | |
bd238fb4 LI |
1502 | return err; |
1503 | } | |
1504 | EXPORT_SYMBOL(p9_client_clunk); | |
1505 | ||
1506 | int p9_client_remove(struct p9_fid *fid) | |
1507 | { | |
1508 | int err; | |
bd238fb4 | 1509 | struct p9_client *clnt; |
51a87c55 | 1510 | struct p9_req_t *req; |
bd238fb4 | 1511 | |
5d385153 | 1512 | p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); |
bd238fb4 | 1513 | err = 0; |
bd238fb4 LI |
1514 | clnt = fid->clnt; |
1515 | ||
51a87c55 EVH |
1516 | req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); |
1517 | if (IS_ERR(req)) { | |
1518 | err = PTR_ERR(req); | |
1519 | goto error; | |
bd238fb4 LI |
1520 | } |
1521 | ||
5d385153 | 1522 | p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); |
bd238fb4 | 1523 | |
43cbcbee | 1524 | p9_tag_remove(clnt, req); |
51a87c55 | 1525 | error: |
208f3c28 JG |
1526 | if (err == -ERESTARTSYS) |
1527 | p9_client_clunk(fid); | |
1528 | else | |
1529 | p9_fid_destroy(fid); | |
bd238fb4 LI |
1530 | return err; |
1531 | } | |
1532 | EXPORT_SYMBOL(p9_client_remove); | |
1533 | ||
48e370ff AK |
1534 | int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) |
1535 | { | |
1536 | int err = 0; | |
1537 | struct p9_req_t *req; | |
1538 | struct p9_client *clnt; | |
1539 | ||
5d385153 | 1540 | p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", |
48e370ff AK |
1541 | dfid->fid, name, flags); |
1542 | ||
1543 | clnt = dfid->clnt; | |
1544 | req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); | |
1545 | if (IS_ERR(req)) { | |
1546 | err = PTR_ERR(req); | |
1547 | goto error; | |
1548 | } | |
5d385153 | 1549 | p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); |
48e370ff | 1550 | |
43cbcbee | 1551 | p9_tag_remove(clnt, req); |
48e370ff AK |
1552 | error: |
1553 | return err; | |
1554 | } | |
1555 | EXPORT_SYMBOL(p9_client_unlinkat); | |
1556 | ||
0fc9655e | 1557 | int |
e1200fe6 | 1558 | p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) |
bd238fb4 | 1559 | { |
e1200fe6 | 1560 | int total = 0; |
999b8b88 | 1561 | *err = 0; |
bd238fb4 | 1562 | |
388f6966 SA |
1563 | while (iov_iter_count(to)) { |
1564 | int count; | |
1565 | ||
1566 | count = p9_client_read_once(fid, offset, to, err); | |
1567 | if (!count || *err) | |
1568 | break; | |
1569 | offset += count; | |
1570 | total += count; | |
1571 | } | |
1572 | return total; | |
1573 | } | |
1574 | EXPORT_SYMBOL(p9_client_read); | |
1575 | ||
1576 | int | |
1577 | p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to, | |
1578 | int *err) | |
1579 | { | |
1580 | struct p9_client *clnt = fid->clnt; | |
1581 | struct p9_req_t *req; | |
1582 | int count = iov_iter_count(to); | |
1583 | int rsize, non_zc = 0; | |
1584 | char *dataptr; | |
1585 | ||
1586 | *err = 0; | |
5d385153 | 1587 | p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", |
e1200fe6 AV |
1588 | fid->fid, (unsigned long long) offset, (int)iov_iter_count(to)); |
1589 | ||
388f6966 SA |
1590 | rsize = fid->iounit; |
1591 | if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) | |
1592 | rsize = clnt->msize - P9_IOHDRSZ; | |
c69f297d | 1593 | |
388f6966 SA |
1594 | if (count < rsize) |
1595 | rsize = count; | |
e1200fe6 | 1596 | |
388f6966 SA |
1597 | /* Don't bother zerocopy for small IO (< 1024) */ |
1598 | if (clnt->trans_mod->zc_request && rsize > 1024) { | |
1599 | /* response header len is 11 | |
1600 | * PDU Header(7) + IO Size (4) | |
1601 | */ | |
1602 | req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, | |
1603 | 0, 11, "dqd", fid->fid, | |
1604 | offset, rsize); | |
1605 | } else { | |
1606 | non_zc = 1; | |
1607 | req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, | |
1608 | rsize); | |
1609 | } | |
1610 | if (IS_ERR(req)) { | |
1611 | *err = PTR_ERR(req); | |
1612 | return 0; | |
1613 | } | |
e1200fe6 | 1614 | |
388f6966 SA |
1615 | *err = p9pdu_readf(&req->rc, clnt->proto_version, |
1616 | "D", &count, &dataptr); | |
1617 | if (*err) { | |
1618 | trace_9p_protocol_dump(clnt, &req->rc); | |
1619 | p9_tag_remove(clnt, req); | |
1620 | return 0; | |
1621 | } | |
1622 | if (rsize < count) { | |
1623 | pr_err("bogus RREAD count (%d > %d)\n", count, rsize); | |
1624 | count = rsize; | |
1625 | } | |
bd238fb4 | 1626 | |
388f6966 | 1627 | p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); |
bd238fb4 | 1628 | |
388f6966 SA |
1629 | if (non_zc) { |
1630 | int n = copy_to_iter(dataptr, count, to); | |
bd238fb4 | 1631 | |
388f6966 SA |
1632 | if (n != count) { |
1633 | *err = -EFAULT; | |
1634 | p9_tag_remove(clnt, req); | |
1635 | return n; | |
e1200fe6 | 1636 | } |
388f6966 SA |
1637 | } else { |
1638 | iov_iter_advance(to, count); | |
51a87c55 | 1639 | } |
388f6966 SA |
1640 | p9_tag_remove(clnt, req); |
1641 | return count; | |
bd238fb4 | 1642 | } |
388f6966 | 1643 | EXPORT_SYMBOL(p9_client_read_once); |
bd238fb4 LI |
1644 | |
1645 | int | |
070b3656 | 1646 | p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) |
bd238fb4 | 1647 | { |
070b3656 | 1648 | struct p9_client *clnt = fid->clnt; |
51a87c55 | 1649 | struct p9_req_t *req; |
070b3656 | 1650 | int total = 0; |
999b8b88 | 1651 | *err = 0; |
070b3656 AV |
1652 | |
1653 | p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n", | |
1654 | fid->fid, (unsigned long long) offset, | |
1655 | iov_iter_count(from)); | |
1656 | ||
1657 | while (iov_iter_count(from)) { | |
1658 | int count = iov_iter_count(from); | |
1659 | int rsize = fid->iounit; | |
1660 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) | |
1661 | rsize = clnt->msize - P9_IOHDRSZ; | |
1662 | ||
1663 | if (count < rsize) | |
1664 | rsize = count; | |
1665 | ||
1666 | /* Don't bother zerocopy for small IO (< 1024) */ | |
1667 | if (clnt->trans_mod->zc_request && rsize > 1024) { | |
1668 | req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, | |
1669 | rsize, P9_ZC_HDR_SZ, "dqd", | |
1670 | fid->fid, offset, rsize); | |
1671 | } else { | |
1672 | req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, | |
1673 | offset, rsize, from); | |
1674 | } | |
1675 | if (IS_ERR(req)) { | |
1676 | *err = PTR_ERR(req); | |
1677 | break; | |
1678 | } | |
bd238fb4 | 1679 | |
523adb6c | 1680 | *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &count); |
070b3656 | 1681 | if (*err) { |
523adb6c | 1682 | trace_9p_protocol_dump(clnt, &req->rc); |
43cbcbee | 1683 | p9_tag_remove(clnt, req); |
67e808fb | 1684 | break; |
070b3656 | 1685 | } |
0f1db7de AV |
1686 | if (rsize < count) { |
1687 | pr_err("bogus RWRITE count (%d > %d)\n", count, rsize); | |
1688 | count = rsize; | |
1689 | } | |
1fc52481 | 1690 | |
070b3656 | 1691 | p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); |
0fc9655e | 1692 | |
43cbcbee | 1693 | p9_tag_remove(clnt, req); |
070b3656 AV |
1694 | iov_iter_advance(from, count); |
1695 | total += count; | |
1696 | offset += count; | |
e7f4b8f1 | 1697 | } |
070b3656 | 1698 | return total; |
bd238fb4 | 1699 | } |
0fc9655e | 1700 | EXPORT_SYMBOL(p9_client_write); |
bd238fb4 | 1701 | |
51a87c55 | 1702 | struct p9_wstat *p9_client_stat(struct p9_fid *fid) |
5503ac56 | 1703 | { |
51a87c55 EVH |
1704 | int err; |
1705 | struct p9_client *clnt; | |
1706 | struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); | |
1707 | struct p9_req_t *req; | |
1708 | u16 ignored; | |
5503ac56 | 1709 | |
5d385153 | 1710 | p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); |
5503ac56 | 1711 | |
5503ac56 EVH |
1712 | if (!ret) |
1713 | return ERR_PTR(-ENOMEM); | |
1714 | ||
bd238fb4 | 1715 | err = 0; |
bd238fb4 LI |
1716 | clnt = fid->clnt; |
1717 | ||
51a87c55 EVH |
1718 | req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); |
1719 | if (IS_ERR(req)) { | |
1720 | err = PTR_ERR(req); | |
bd238fb4 LI |
1721 | goto error; |
1722 | } | |
1723 | ||
523adb6c | 1724 | err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret); |
e7f4b8f1 | 1725 | if (err) { |
523adb6c | 1726 | trace_9p_protocol_dump(clnt, &req->rc); |
43cbcbee | 1727 | p9_tag_remove(clnt, req); |
eedfe1c4 | 1728 | goto error; |
e7f4b8f1 | 1729 | } |
bd238fb4 | 1730 | |
5d385153 | 1731 | p9_debug(P9_DEBUG_9P, |
e7f4b8f1 EVH |
1732 | "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" |
1733 | "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" | |
1734 | "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" | |
1735 | "<<< uid=%d gid=%d n_muid=%d\n", | |
51a87c55 | 1736 | ret->size, ret->type, ret->dev, ret->qid.type, |
b0d5fdef RD |
1737 | (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, |
1738 | ret->atime, ret->mtime, (unsigned long long)ret->length, | |
1739 | ret->name, ret->uid, ret->gid, ret->muid, ret->extension, | |
447c5094 EB |
1740 | from_kuid(&init_user_ns, ret->n_uid), |
1741 | from_kgid(&init_user_ns, ret->n_gid), | |
1742 | from_kuid(&init_user_ns, ret->n_muid)); | |
bd238fb4 | 1743 | |
43cbcbee | 1744 | p9_tag_remove(clnt, req); |
742b11a7 LI |
1745 | return ret; |
1746 | ||
bd238fb4 | 1747 | error: |
742b11a7 LI |
1748 | kfree(ret); |
1749 | return ERR_PTR(err); | |
bd238fb4 LI |
1750 | } |
1751 | EXPORT_SYMBOL(p9_client_stat); | |
1752 | ||
f0853122 SK |
1753 | struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, |
1754 | u64 request_mask) | |
1755 | { | |
1756 | int err; | |
1757 | struct p9_client *clnt; | |
1758 | struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl), | |
1759 | GFP_KERNEL); | |
1760 | struct p9_req_t *req; | |
1761 | ||
5d385153 | 1762 | p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", |
f0853122 SK |
1763 | fid->fid, request_mask); |
1764 | ||
1765 | if (!ret) | |
1766 | return ERR_PTR(-ENOMEM); | |
1767 | ||
1768 | err = 0; | |
1769 | clnt = fid->clnt; | |
1770 | ||
1771 | req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); | |
1772 | if (IS_ERR(req)) { | |
1773 | err = PTR_ERR(req); | |
1774 | goto error; | |
1775 | } | |
1776 | ||
523adb6c | 1777 | err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret); |
f0853122 | 1778 | if (err) { |
523adb6c | 1779 | trace_9p_protocol_dump(clnt, &req->rc); |
43cbcbee | 1780 | p9_tag_remove(clnt, req); |
f0853122 SK |
1781 | goto error; |
1782 | } | |
1783 | ||
5d385153 | 1784 | p9_debug(P9_DEBUG_9P, |
f0853122 SK |
1785 | "<<< RGETATTR st_result_mask=%lld\n" |
1786 | "<<< qid=%x.%llx.%x\n" | |
1787 | "<<< st_mode=%8.8x st_nlink=%llu\n" | |
1788 | "<<< st_uid=%d st_gid=%d\n" | |
1789 | "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" | |
1790 | "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" | |
1791 | "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" | |
1792 | "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" | |
1793 | "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" | |
64ad31f3 | 1794 | "<<< st_gen=%lld st_data_version=%lld\n", |
f0853122 | 1795 | ret->st_result_mask, ret->qid.type, ret->qid.path, |
447c5094 EB |
1796 | ret->qid.version, ret->st_mode, ret->st_nlink, |
1797 | from_kuid(&init_user_ns, ret->st_uid), | |
1798 | from_kgid(&init_user_ns, ret->st_gid), | |
1799 | ret->st_rdev, ret->st_size, ret->st_blksize, | |
f0853122 SK |
1800 | ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec, |
1801 | ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec, | |
1802 | ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec, | |
1803 | ret->st_gen, ret->st_data_version); | |
1804 | ||
43cbcbee | 1805 | p9_tag_remove(clnt, req); |
f0853122 SK |
1806 | return ret; |
1807 | ||
1808 | error: | |
1809 | kfree(ret); | |
1810 | return ERR_PTR(err); | |
1811 | } | |
1812 | EXPORT_SYMBOL(p9_client_getattr_dotl); | |
1813 | ||
342fee1d | 1814 | static int p9_client_statsize(struct p9_wstat *wst, int proto_version) |
453ed90d LI |
1815 | { |
1816 | int ret; | |
1817 | ||
9d6939da | 1818 | /* NOTE: size shouldn't include its own length */ |
453ed90d LI |
1819 | /* size[2] type[2] dev[4] qid[13] */ |
1820 | /* mode[4] atime[4] mtime[4] length[8]*/ | |
1821 | /* name[s] uid[s] gid[s] muid[s] */ | |
9d6939da | 1822 | ret = 2+4+13+4+4+4+8+2+2+2+2; |
453ed90d LI |
1823 | |
1824 | if (wst->name) | |
1825 | ret += strlen(wst->name); | |
1826 | if (wst->uid) | |
1827 | ret += strlen(wst->uid); | |
1828 | if (wst->gid) | |
1829 | ret += strlen(wst->gid); | |
1830 | if (wst->muid) | |
1831 | ret += strlen(wst->muid); | |
1832 | ||
c56e4acf SK |
1833 | if ((proto_version == p9_proto_2000u) || |
1834 | (proto_version == p9_proto_2000L)) { | |
453ed90d LI |
1835 | ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ |
1836 | if (wst->extension) | |
1837 | ret += strlen(wst->extension); | |
1838 | } | |
1839 | ||
1840 | return ret; | |
1841 | } | |
1842 | ||
bd238fb4 LI |
1843 | int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) |
1844 | { | |
1845 | int err; | |
51a87c55 | 1846 | struct p9_req_t *req; |
bd238fb4 LI |
1847 | struct p9_client *clnt; |
1848 | ||
453ed90d LI |
1849 | err = 0; |
1850 | clnt = fid->clnt; | |
342fee1d | 1851 | wst->size = p9_client_statsize(wst, clnt->proto_version); |
5d385153 JP |
1852 | p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); |
1853 | p9_debug(P9_DEBUG_9P, | |
e7f4b8f1 EVH |
1854 | " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" |
1855 | " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" | |
1856 | " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" | |
1857 | " uid=%d gid=%d n_muid=%d\n", | |
1858 | wst->size, wst->type, wst->dev, wst->qid.type, | |
b0d5fdef RD |
1859 | (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, |
1860 | wst->atime, wst->mtime, (unsigned long long)wst->length, | |
1861 | wst->name, wst->uid, wst->gid, wst->muid, wst->extension, | |
447c5094 EB |
1862 | from_kuid(&init_user_ns, wst->n_uid), |
1863 | from_kgid(&init_user_ns, wst->n_gid), | |
1864 | from_kuid(&init_user_ns, wst->n_muid)); | |
bd238fb4 | 1865 | |
9d6939da | 1866 | req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); |
51a87c55 EVH |
1867 | if (IS_ERR(req)) { |
1868 | err = PTR_ERR(req); | |
1869 | goto error; | |
bd238fb4 LI |
1870 | } |
1871 | ||
5d385153 | 1872 | p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); |
bd238fb4 | 1873 | |
43cbcbee | 1874 | p9_tag_remove(clnt, req); |
51a87c55 | 1875 | error: |
bd238fb4 LI |
1876 | return err; |
1877 | } | |
1878 | EXPORT_SYMBOL(p9_client_wstat); | |
bda8e775 | 1879 | |
87d7845a SK |
1880 | int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) |
1881 | { | |
1882 | int err; | |
1883 | struct p9_req_t *req; | |
1884 | struct p9_client *clnt; | |
1885 | ||
1886 | err = 0; | |
1887 | clnt = fid->clnt; | |
5d385153 JP |
1888 | p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); |
1889 | p9_debug(P9_DEBUG_9P, | |
87d7845a SK |
1890 | " valid=%x mode=%x uid=%d gid=%d size=%lld\n" |
1891 | " atime_sec=%lld atime_nsec=%lld\n" | |
1892 | " mtime_sec=%lld mtime_nsec=%lld\n", | |
447c5094 EB |
1893 | p9attr->valid, p9attr->mode, |
1894 | from_kuid(&init_user_ns, p9attr->uid), | |
1895 | from_kgid(&init_user_ns, p9attr->gid), | |
87d7845a SK |
1896 | p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, |
1897 | p9attr->mtime_sec, p9attr->mtime_nsec); | |
1898 | ||
1899 | req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); | |
1900 | ||
1901 | if (IS_ERR(req)) { | |
1902 | err = PTR_ERR(req); | |
1903 | goto error; | |
1904 | } | |
5d385153 | 1905 | p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); |
43cbcbee | 1906 | p9_tag_remove(clnt, req); |
87d7845a SK |
1907 | error: |
1908 | return err; | |
1909 | } | |
1910 | EXPORT_SYMBOL(p9_client_setattr); | |
1911 | ||
bda8e775 SK |
1912 | int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) |
1913 | { | |
1914 | int err; | |
1915 | struct p9_req_t *req; | |
1916 | struct p9_client *clnt; | |
1917 | ||
1918 | err = 0; | |
1919 | clnt = fid->clnt; | |
1920 | ||
5d385153 | 1921 | p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); |
bda8e775 SK |
1922 | |
1923 | req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); | |
1924 | if (IS_ERR(req)) { | |
1925 | err = PTR_ERR(req); | |
1926 | goto error; | |
1927 | } | |
1928 | ||
523adb6c DM |
1929 | err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, |
1930 | &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, | |
1931 | &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); | |
bda8e775 | 1932 | if (err) { |
523adb6c | 1933 | trace_9p_protocol_dump(clnt, &req->rc); |
43cbcbee | 1934 | p9_tag_remove(clnt, req); |
bda8e775 SK |
1935 | goto error; |
1936 | } | |
1937 | ||
5d385153 | 1938 | p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld " |
bda8e775 SK |
1939 | "blocks %llu bfree %llu bavail %llu files %llu ffree %llu " |
1940 | "fsid %llu namelen %ld\n", | |
1941 | fid->fid, (long unsigned int)sb->type, (long int)sb->bsize, | |
1942 | sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree, | |
1943 | sb->fsid, (long int)sb->namelen); | |
1944 | ||
43cbcbee | 1945 | p9_tag_remove(clnt, req); |
bda8e775 SK |
1946 | error: |
1947 | return err; | |
1948 | } | |
1949 | EXPORT_SYMBOL(p9_client_statfs); | |
4681dbda | 1950 | |
9e8fb38e AK |
1951 | int p9_client_rename(struct p9_fid *fid, |
1952 | struct p9_fid *newdirfid, const char *name) | |
4681dbda SK |
1953 | { |
1954 | int err; | |
1955 | struct p9_req_t *req; | |
1956 | struct p9_client *clnt; | |
1957 | ||
1958 | err = 0; | |
1959 | clnt = fid->clnt; | |
1960 | ||
5d385153 | 1961 | p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", |
4681dbda SK |
1962 | fid->fid, newdirfid->fid, name); |
1963 | ||
1964 | req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, | |
1965 | newdirfid->fid, name); | |
1966 | if (IS_ERR(req)) { | |
1967 | err = PTR_ERR(req); | |
1968 | goto error; | |
1969 | } | |
1970 | ||
5d385153 | 1971 | p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); |
4681dbda | 1972 | |
43cbcbee | 1973 | p9_tag_remove(clnt, req); |
4681dbda SK |
1974 | error: |
1975 | return err; | |
1976 | } | |
1977 | EXPORT_SYMBOL(p9_client_rename); | |
1978 | ||
9e8fb38e AK |
1979 | int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, |
1980 | struct p9_fid *newdirfid, const char *new_name) | |
1981 | { | |
1982 | int err; | |
1983 | struct p9_req_t *req; | |
1984 | struct p9_client *clnt; | |
1985 | ||
1986 | err = 0; | |
1987 | clnt = olddirfid->clnt; | |
1988 | ||
5d385153 | 1989 | p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s" |
9e8fb38e AK |
1990 | " newdirfid %d new name %s\n", olddirfid->fid, old_name, |
1991 | newdirfid->fid, new_name); | |
1992 | ||
1993 | req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, | |
1994 | old_name, newdirfid->fid, new_name); | |
1995 | if (IS_ERR(req)) { | |
1996 | err = PTR_ERR(req); | |
1997 | goto error; | |
1998 | } | |
1999 | ||
5d385153 | 2000 | p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", |
9e8fb38e AK |
2001 | newdirfid->fid, new_name); |
2002 | ||
43cbcbee | 2003 | p9_tag_remove(clnt, req); |
9e8fb38e AK |
2004 | error: |
2005 | return err; | |
2006 | } | |
2007 | EXPORT_SYMBOL(p9_client_renameat); | |
2008 | ||
0ef63f34 AK |
2009 | /* |
2010 | * An xattrwalk without @attr_name gives the fid for the lisxattr namespace | |
2011 | */ | |
2012 | struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, | |
2013 | const char *attr_name, u64 *attr_size) | |
2014 | { | |
2015 | int err; | |
2016 | struct p9_req_t *req; | |
2017 | struct p9_client *clnt; | |
2018 | struct p9_fid *attr_fid; | |
2019 | ||
2020 | err = 0; | |
2021 | clnt = file_fid->clnt; | |
2022 | attr_fid = p9_fid_create(clnt); | |
b5303be2 MW |
2023 | if (!attr_fid) { |
2024 | err = -ENOMEM; | |
0ef63f34 AK |
2025 | goto error; |
2026 | } | |
5d385153 | 2027 | p9_debug(P9_DEBUG_9P, |
0ef63f34 AK |
2028 | ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", |
2029 | file_fid->fid, attr_fid->fid, attr_name); | |
2030 | ||
2031 | req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", | |
2032 | file_fid->fid, attr_fid->fid, attr_name); | |
2033 | if (IS_ERR(req)) { | |
2034 | err = PTR_ERR(req); | |
2035 | goto error; | |
2036 | } | |
523adb6c | 2037 | err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size); |
0ef63f34 | 2038 | if (err) { |
523adb6c | 2039 | trace_9p_protocol_dump(clnt, &req->rc); |
43cbcbee | 2040 | p9_tag_remove(clnt, req); |
0ef63f34 AK |
2041 | goto clunk_fid; |
2042 | } | |
43cbcbee | 2043 | p9_tag_remove(clnt, req); |
5d385153 | 2044 | p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", |
0ef63f34 AK |
2045 | attr_fid->fid, *attr_size); |
2046 | return attr_fid; | |
2047 | clunk_fid: | |
2048 | p9_client_clunk(attr_fid); | |
2049 | attr_fid = NULL; | |
2050 | error: | |
2051 | if (attr_fid && (attr_fid != file_fid)) | |
2052 | p9_fid_destroy(attr_fid); | |
2053 | ||
2054 | return ERR_PTR(err); | |
2055 | } | |
2056 | EXPORT_SYMBOL_GPL(p9_client_xattrwalk); | |
2057 | ||
eda25e46 AK |
2058 | int p9_client_xattrcreate(struct p9_fid *fid, const char *name, |
2059 | u64 attr_size, int flags) | |
2060 | { | |
2061 | int err; | |
2062 | struct p9_req_t *req; | |
2063 | struct p9_client *clnt; | |
2064 | ||
5d385153 | 2065 | p9_debug(P9_DEBUG_9P, |
eda25e46 AK |
2066 | ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n", |
2067 | fid->fid, name, (long long)attr_size, flags); | |
2068 | err = 0; | |
2069 | clnt = fid->clnt; | |
2070 | req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", | |
2071 | fid->fid, name, attr_size, flags); | |
2072 | if (IS_ERR(req)) { | |
2073 | err = PTR_ERR(req); | |
2074 | goto error; | |
2075 | } | |
5d385153 | 2076 | p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); |
43cbcbee | 2077 | p9_tag_remove(clnt, req); |
eda25e46 AK |
2078 | error: |
2079 | return err; | |
2080 | } | |
2081 | EXPORT_SYMBOL_GPL(p9_client_xattrcreate); | |
2082 | ||
7751bdb3 SK |
2083 | int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) |
2084 | { | |
abfa034e | 2085 | int err, rsize, non_zc = 0; |
7751bdb3 SK |
2086 | struct p9_client *clnt; |
2087 | struct p9_req_t *req; | |
2088 | char *dataptr; | |
4f3b35c1 AV |
2089 | struct kvec kv = {.iov_base = data, .iov_len = count}; |
2090 | struct iov_iter to; | |
2091 | ||
aa563d7b | 2092 | iov_iter_kvec(&to, READ, &kv, 1, count); |
7751bdb3 | 2093 | |
5d385153 | 2094 | p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", |
95c96174 | 2095 | fid->fid, (unsigned long long) offset, count); |
7751bdb3 SK |
2096 | |
2097 | err = 0; | |
2098 | clnt = fid->clnt; | |
7751bdb3 SK |
2099 | |
2100 | rsize = fid->iounit; | |
2101 | if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ) | |
2102 | rsize = clnt->msize - P9_READDIRHDRSZ; | |
2103 | ||
2104 | if (count < rsize) | |
2105 | rsize = count; | |
2106 | ||
abfa034e AK |
2107 | /* Don't bother zerocopy for small IO (< 1024) */ |
2108 | if (clnt->trans_mod->zc_request && rsize > 1024) { | |
2109 | /* | |
2110 | * response header len is 11 | |
2111 | * PDU Header(7) + IO Size (4) | |
2112 | */ | |
4f3b35c1 AV |
2113 | req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, |
2114 | 11, "dqd", fid->fid, offset, rsize); | |
2c66523f | 2115 | } else { |
abfa034e | 2116 | non_zc = 1; |
2c66523f | 2117 | req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, |
abfa034e | 2118 | offset, rsize); |
2c66523f | 2119 | } |
7751bdb3 SK |
2120 | if (IS_ERR(req)) { |
2121 | err = PTR_ERR(req); | |
2122 | goto error; | |
2123 | } | |
2124 | ||
523adb6c | 2125 | err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr); |
7751bdb3 | 2126 | if (err) { |
523adb6c | 2127 | trace_9p_protocol_dump(clnt, &req->rc); |
7751bdb3 SK |
2128 | goto free_and_error; |
2129 | } | |
71d6ad08 AV |
2130 | if (rsize < count) { |
2131 | pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); | |
2132 | count = rsize; | |
2133 | } | |
7751bdb3 | 2134 | |
5d385153 | 2135 | p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); |
7751bdb3 | 2136 | |
abfa034e | 2137 | if (non_zc) |
7751bdb3 SK |
2138 | memmove(data, dataptr, count); |
2139 | ||
43cbcbee | 2140 | p9_tag_remove(clnt, req); |
7751bdb3 SK |
2141 | return count; |
2142 | ||
2143 | free_and_error: | |
43cbcbee | 2144 | p9_tag_remove(clnt, req); |
7751bdb3 SK |
2145 | error: |
2146 | return err; | |
2147 | } | |
2148 | EXPORT_SYMBOL(p9_client_readdir); | |
4b43516a | 2149 | |
7880b43b | 2150 | int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, |
f791f7c5 | 2151 | dev_t rdev, kgid_t gid, struct p9_qid *qid) |
4b43516a MK |
2152 | { |
2153 | int err; | |
2154 | struct p9_client *clnt; | |
2155 | struct p9_req_t *req; | |
2156 | ||
2157 | err = 0; | |
2158 | clnt = fid->clnt; | |
5d385153 | 2159 | p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d " |
4b43516a | 2160 | "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); |
f791f7c5 | 2161 | req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, |
4b43516a MK |
2162 | MAJOR(rdev), MINOR(rdev), gid); |
2163 | if (IS_ERR(req)) | |
2164 | return PTR_ERR(req); | |
2165 | ||
523adb6c | 2166 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); |
4b43516a | 2167 | if (err) { |
523adb6c | 2168 | trace_9p_protocol_dump(clnt, &req->rc); |
4b43516a MK |
2169 | goto error; |
2170 | } | |
5d385153 | 2171 | p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type, |
4b43516a MK |
2172 | (unsigned long long)qid->path, qid->version); |
2173 | ||
2174 | error: | |
43cbcbee | 2175 | p9_tag_remove(clnt, req); |
4b43516a MK |
2176 | return err; |
2177 | ||
2178 | } | |
2179 | EXPORT_SYMBOL(p9_client_mknod_dotl); | |
01a622bd | 2180 | |
7880b43b | 2181 | int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, |
f791f7c5 | 2182 | kgid_t gid, struct p9_qid *qid) |
01a622bd MK |
2183 | { |
2184 | int err; | |
2185 | struct p9_client *clnt; | |
2186 | struct p9_req_t *req; | |
2187 | ||
2188 | err = 0; | |
2189 | clnt = fid->clnt; | |
5d385153 | 2190 | p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", |
f791f7c5 EB |
2191 | fid->fid, name, mode, from_kgid(&init_user_ns, gid)); |
2192 | req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode, | |
01a622bd MK |
2193 | gid); |
2194 | if (IS_ERR(req)) | |
2195 | return PTR_ERR(req); | |
2196 | ||
523adb6c | 2197 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); |
01a622bd | 2198 | if (err) { |
523adb6c | 2199 | trace_9p_protocol_dump(clnt, &req->rc); |
01a622bd MK |
2200 | goto error; |
2201 | } | |
5d385153 | 2202 | p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, |
01a622bd MK |
2203 | (unsigned long long)qid->path, qid->version); |
2204 | ||
2205 | error: | |
43cbcbee | 2206 | p9_tag_remove(clnt, req); |
01a622bd MK |
2207 | return err; |
2208 | ||
2209 | } | |
2210 | EXPORT_SYMBOL(p9_client_mkdir_dotl); | |
a099027c MK |
2211 | |
2212 | int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) | |
2213 | { | |
2214 | int err; | |
2215 | struct p9_client *clnt; | |
2216 | struct p9_req_t *req; | |
2217 | ||
2218 | err = 0; | |
2219 | clnt = fid->clnt; | |
5d385153 | 2220 | p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d " |
a099027c MK |
2221 | "start %lld length %lld proc_id %d client_id %s\n", |
2222 | fid->fid, flock->type, flock->flags, flock->start, | |
2223 | flock->length, flock->proc_id, flock->client_id); | |
2224 | ||
2225 | req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, | |
2226 | flock->flags, flock->start, flock->length, | |
2227 | flock->proc_id, flock->client_id); | |
2228 | ||
2229 | if (IS_ERR(req)) | |
2230 | return PTR_ERR(req); | |
2231 | ||
523adb6c | 2232 | err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status); |
a099027c | 2233 | if (err) { |
523adb6c | 2234 | trace_9p_protocol_dump(clnt, &req->rc); |
a099027c MK |
2235 | goto error; |
2236 | } | |
5d385153 | 2237 | p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); |
a099027c | 2238 | error: |
43cbcbee | 2239 | p9_tag_remove(clnt, req); |
a099027c MK |
2240 | return err; |
2241 | ||
2242 | } | |
2243 | EXPORT_SYMBOL(p9_client_lock_dotl); | |
1d769cd1 MK |
2244 | |
2245 | int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) | |
2246 | { | |
2247 | int err; | |
2248 | struct p9_client *clnt; | |
2249 | struct p9_req_t *req; | |
2250 | ||
2251 | err = 0; | |
2252 | clnt = fid->clnt; | |
5d385153 | 2253 | p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld " |
1d769cd1 MK |
2254 | "length %lld proc_id %d client_id %s\n", fid->fid, glock->type, |
2255 | glock->start, glock->length, glock->proc_id, glock->client_id); | |
2256 | ||
2257 | req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type, | |
2258 | glock->start, glock->length, glock->proc_id, glock->client_id); | |
2259 | ||
2260 | if (IS_ERR(req)) | |
2261 | return PTR_ERR(req); | |
2262 | ||
523adb6c DM |
2263 | err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type, |
2264 | &glock->start, &glock->length, &glock->proc_id, | |
2265 | &glock->client_id); | |
1d769cd1 | 2266 | if (err) { |
523adb6c | 2267 | trace_9p_protocol_dump(clnt, &req->rc); |
1d769cd1 MK |
2268 | goto error; |
2269 | } | |
5d385153 | 2270 | p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld " |
1d769cd1 MK |
2271 | "proc_id %d client_id %s\n", glock->type, glock->start, |
2272 | glock->length, glock->proc_id, glock->client_id); | |
2273 | error: | |
43cbcbee | 2274 | p9_tag_remove(clnt, req); |
1d769cd1 MK |
2275 | return err; |
2276 | } | |
2277 | EXPORT_SYMBOL(p9_client_getlock_dotl); | |
329176cc MK |
2278 | |
2279 | int p9_client_readlink(struct p9_fid *fid, char **target) | |
2280 | { | |
2281 | int err; | |
2282 | struct p9_client *clnt; | |
2283 | struct p9_req_t *req; | |
2284 | ||
2285 | err = 0; | |
2286 | clnt = fid->clnt; | |
5d385153 | 2287 | p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); |
329176cc MK |
2288 | |
2289 | req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); | |
2290 | if (IS_ERR(req)) | |
2291 | return PTR_ERR(req); | |
2292 | ||
523adb6c | 2293 | err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target); |
329176cc | 2294 | if (err) { |
523adb6c | 2295 | trace_9p_protocol_dump(clnt, &req->rc); |
329176cc MK |
2296 | goto error; |
2297 | } | |
5d385153 | 2298 | p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); |
329176cc | 2299 | error: |
43cbcbee | 2300 | p9_tag_remove(clnt, req); |
329176cc MK |
2301 | return err; |
2302 | } | |
2303 | EXPORT_SYMBOL(p9_client_readlink); | |
996d5b4d MW |
2304 | |
2305 | int __init p9_client_init(void) | |
2306 | { | |
728356de | 2307 | p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); |
996d5b4d MW |
2308 | return p9_req_cache ? 0 : -ENOMEM; |
2309 | } | |
2310 | ||
2311 | void __exit p9_client_exit(void) | |
2312 | { | |
2313 | kmem_cache_destroy(p9_req_cache); | |
2314 | } |