Commit | Line | Data |
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1f327613 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
bd238fb4 | 2 | /* |
bd238fb4 LI |
3 | * 9P Client |
4 | * | |
8a0dc95f | 5 | * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com> |
bd238fb4 | 6 | * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net> |
bd238fb4 LI |
7 | */ |
8 | ||
5d385153 JP |
9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
10 | ||
bd238fb4 LI |
11 | #include <linux/module.h> |
12 | #include <linux/errno.h> | |
13 | #include <linux/fs.h> | |
8a0dc95f | 14 | #include <linux/poll.h> |
bd238fb4 LI |
15 | #include <linux/idr.h> |
16 | #include <linux/mutex.h> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
3f07c014 | 18 | #include <linux/sched/signal.h> |
bd238fb4 | 19 | #include <linux/uaccess.h> |
4f3b35c1 | 20 | #include <linux/uio.h> |
bd238fb4 | 21 | #include <net/9p/9p.h> |
fb0466c3 | 22 | #include <linux/parser.h> |
c4fac910 | 23 | #include <linux/seq_file.h> |
bd238fb4 | 24 | #include <net/9p/client.h> |
8b81ef58 | 25 | #include <net/9p/transport.h> |
51a87c55 | 26 | #include "protocol.h" |
bd238fb4 | 27 | |
348b5901 AK |
28 | #define CREATE_TRACE_POINTS |
29 | #include <trace/events/9p.h> | |
30 | ||
9c4d94dc | 31 | #define DEFAULT_MSIZE (128 * 1024) |
9210fc0a | 32 | |
6e195b0f DM |
33 | /* Client Option Parsing (code inspired by NFS code) |
34 | * - a little lazy - parse all client options | |
35 | */ | |
8a0dc95f EVH |
36 | |
37 | enum { | |
38 | Opt_msize, | |
39 | Opt_trans, | |
40 | Opt_legacy, | |
0fb80abd | 41 | Opt_version, |
8a0dc95f EVH |
42 | Opt_err, |
43 | }; | |
44 | ||
a447c093 | 45 | static const match_table_t tokens = { |
8a0dc95f EVH |
46 | {Opt_msize, "msize=%u"}, |
47 | {Opt_legacy, "noextend"}, | |
48 | {Opt_trans, "trans=%s"}, | |
0fb80abd | 49 | {Opt_version, "version=%s"}, |
8a0dc95f EVH |
50 | {Opt_err, NULL}, |
51 | }; | |
52 | ||
342fee1d SK |
53 | inline int p9_is_proto_dotl(struct p9_client *clnt) |
54 | { | |
a02cec21 | 55 | return clnt->proto_version == p9_proto_2000L; |
342fee1d SK |
56 | } |
57 | EXPORT_SYMBOL(p9_is_proto_dotl); | |
58 | ||
59 | inline int p9_is_proto_dotu(struct p9_client *clnt) | |
60 | { | |
a02cec21 | 61 | return clnt->proto_version == p9_proto_2000u; |
342fee1d SK |
62 | } |
63 | EXPORT_SYMBOL(p9_is_proto_dotu); | |
64 | ||
c4fac910 DH |
65 | int p9_show_client_options(struct seq_file *m, struct p9_client *clnt) |
66 | { | |
9210fc0a | 67 | if (clnt->msize != DEFAULT_MSIZE) |
c4fac910 | 68 | seq_printf(m, ",msize=%u", clnt->msize); |
61b272c3 | 69 | seq_printf(m, ",trans=%s", clnt->trans_mod->name); |
c4fac910 DH |
70 | |
71 | switch (clnt->proto_version) { | |
72 | case p9_proto_legacy: | |
73 | seq_puts(m, ",noextend"); | |
74 | break; | |
75 | case p9_proto_2000u: | |
76 | seq_puts(m, ",version=9p2000.u"); | |
77 | break; | |
78 | case p9_proto_2000L: | |
79 | /* Default */ | |
80 | break; | |
81 | } | |
82 | ||
83 | if (clnt->trans_mod->show_options) | |
84 | return clnt->trans_mod->show_options(m, clnt); | |
85 | return 0; | |
86 | } | |
87 | EXPORT_SYMBOL(p9_show_client_options); | |
88 | ||
6e195b0f | 89 | /* Some error codes are taken directly from the server replies, |
43def35c SD |
90 | * make sure they are valid. |
91 | */ | |
92 | static int safe_errno(int err) | |
93 | { | |
6e195b0f | 94 | if (err > 0 || err < -MAX_ERRNO) { |
43def35c SD |
95 | p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err); |
96 | return -EPROTO; | |
97 | } | |
98 | return err; | |
99 | } | |
100 | ||
0fb80abd | 101 | /* Interpret mount option for protocol version */ |
4d63055f | 102 | static int get_protocol_version(char *s) |
0fb80abd | 103 | { |
3dc9fef6 DC |
104 | int version = -EINVAL; |
105 | ||
4d63055f | 106 | if (!strcmp(s, "9p2000")) { |
0fb80abd | 107 | version = p9_proto_legacy; |
5d385153 | 108 | p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n"); |
4d63055f | 109 | } else if (!strcmp(s, "9p2000.u")) { |
0fb80abd | 110 | version = p9_proto_2000u; |
5d385153 | 111 | p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n"); |
4d63055f | 112 | } else if (!strcmp(s, "9p2000.L")) { |
45bc21ed | 113 | version = p9_proto_2000L; |
5d385153 | 114 | p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n"); |
6e195b0f | 115 | } else { |
5d385153 | 116 | pr_info("Unknown protocol version %s\n", s); |
6e195b0f | 117 | } |
4d63055f | 118 | |
0fb80abd SK |
119 | return version; |
120 | } | |
121 | ||
8a0dc95f | 122 | /** |
03ff7371 | 123 | * parse_opts - parse mount options into client structure |
0e15597e AK |
124 | * @opts: options string passed from mount |
125 | * @clnt: existing v9fs client information | |
8a0dc95f | 126 | * |
bb8ffdfc | 127 | * Return 0 upon success, -ERRNO upon failure |
8a0dc95f EVH |
128 | */ |
129 | ||
bb8ffdfc | 130 | static int parse_opts(char *opts, struct p9_client *clnt) |
8a0dc95f | 131 | { |
d8c8a9e3 | 132 | char *options, *tmp_options; |
8a0dc95f EVH |
133 | char *p; |
134 | substring_t args[MAX_OPT_ARGS]; | |
135 | int option; | |
4d63055f | 136 | char *s; |
bb8ffdfc | 137 | int ret = 0; |
8a0dc95f | 138 | |
095e7999 | 139 | clnt->proto_version = p9_proto_2000L; |
9210fc0a | 140 | clnt->msize = DEFAULT_MSIZE; |
8a0dc95f | 141 | |
bb8ffdfc EVH |
142 | if (!opts) |
143 | return 0; | |
144 | ||
d8c8a9e3 | 145 | tmp_options = kstrdup(opts, GFP_KERNEL); |
6e195b0f | 146 | if (!tmp_options) |
bb8ffdfc | 147 | return -ENOMEM; |
d8c8a9e3 | 148 | options = tmp_options; |
8a0dc95f EVH |
149 | |
150 | while ((p = strsep(&options, ",")) != NULL) { | |
4d5077f1 | 151 | int token, r; |
6e195b0f | 152 | |
8a0dc95f EVH |
153 | if (!*p) |
154 | continue; | |
155 | token = match_token(p, tokens, args); | |
4d5077f1 AK |
156 | switch (token) { |
157 | case Opt_msize: | |
158 | r = match_int(&args[0], &option); | |
bb8ffdfc | 159 | if (r < 0) { |
5d385153 JP |
160 | p9_debug(P9_DEBUG_ERROR, |
161 | "integer field, but no integer?\n"); | |
bb8ffdfc | 162 | ret = r; |
8a0dc95f EVH |
163 | continue; |
164 | } | |
574d356b DM |
165 | if (option < 4096) { |
166 | p9_debug(P9_DEBUG_ERROR, | |
167 | "msize should be at least 4k\n"); | |
168 | ret = -EINVAL; | |
169 | continue; | |
170 | } | |
8a0dc95f EVH |
171 | clnt->msize = option; |
172 | break; | |
173 | case Opt_trans: | |
4d63055f PK |
174 | s = match_strdup(&args[0]); |
175 | if (!s) { | |
176 | ret = -ENOMEM; | |
5d385153 JP |
177 | p9_debug(P9_DEBUG_ERROR, |
178 | "problem allocating copy of trans arg\n"); | |
4d63055f | 179 | goto free_and_return; |
9421c3e6 CX |
180 | } |
181 | ||
182 | v9fs_put_trans(clnt->trans_mod); | |
4d63055f | 183 | clnt->trans_mod = v9fs_get_trans_by_name(s); |
6e195b0f | 184 | if (!clnt->trans_mod) { |
5d385153 JP |
185 | pr_info("Could not find request transport: %s\n", |
186 | s); | |
349d3bb8 | 187 | ret = -EINVAL; |
349d3bb8 | 188 | } |
4d63055f | 189 | kfree(s); |
8a0dc95f EVH |
190 | break; |
191 | case Opt_legacy: | |
342fee1d | 192 | clnt->proto_version = p9_proto_legacy; |
8a0dc95f | 193 | break; |
0fb80abd | 194 | case Opt_version: |
4d63055f PK |
195 | s = match_strdup(&args[0]); |
196 | if (!s) { | |
197 | ret = -ENOMEM; | |
5d385153 JP |
198 | p9_debug(P9_DEBUG_ERROR, |
199 | "problem allocating copy of version arg\n"); | |
0fb80abd | 200 | goto free_and_return; |
4d63055f | 201 | } |
8d856c72 CX |
202 | r = get_protocol_version(s); |
203 | if (r < 0) | |
204 | ret = r; | |
205 | else | |
206 | clnt->proto_version = r; | |
4d63055f | 207 | kfree(s); |
0fb80abd | 208 | break; |
8a0dc95f EVH |
209 | default: |
210 | continue; | |
211 | } | |
212 | } | |
72029fe8 | 213 | |
349d3bb8 | 214 | free_and_return: |
c290fba8 | 215 | if (ret) |
216 | v9fs_put_trans(clnt->trans_mod); | |
d8c8a9e3 | 217 | kfree(tmp_options); |
bb8ffdfc | 218 | return ret; |
8a0dc95f EVH |
219 | } |
220 | ||
91a76be3 DM |
221 | static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc, |
222 | int alloc_msize) | |
5387320d | 223 | { |
91a76be3 DM |
224 | if (likely(c->fcall_cache) && alloc_msize == c->msize) { |
225 | fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS); | |
226 | fc->cache = c->fcall_cache; | |
227 | } else { | |
228 | fc->sdata = kmalloc(alloc_msize, GFP_NOFS); | |
229 | fc->cache = NULL; | |
230 | } | |
523adb6c DM |
231 | if (!fc->sdata) |
232 | return -ENOMEM; | |
5387320d | 233 | fc->capacity = alloc_msize; |
523adb6c DM |
234 | return 0; |
235 | } | |
236 | ||
237 | void p9_fcall_fini(struct p9_fcall *fc) | |
238 | { | |
91a76be3 DM |
239 | /* sdata can be NULL for interrupted requests in trans_rdma, |
240 | * and kmem_cache_free does not do NULL-check for us | |
241 | */ | |
242 | if (unlikely(!fc->sdata)) | |
243 | return; | |
244 | ||
245 | if (fc->cache) | |
246 | kmem_cache_free(fc->cache, fc->sdata); | |
247 | else | |
248 | kfree(fc->sdata); | |
5387320d | 249 | } |
523adb6c | 250 | EXPORT_SYMBOL(p9_fcall_fini); |
5387320d | 251 | |
996d5b4d MW |
252 | static struct kmem_cache *p9_req_cache; |
253 | ||
fea511a6 | 254 | /** |
03ff7371 | 255 | * p9_tag_alloc - Allocate a new request. |
996d5b4d MW |
256 | * @c: Client session. |
257 | * @type: Transaction type. | |
258 | * @max_size: Maximum packet size for this request. | |
fea511a6 | 259 | * |
996d5b4d MW |
260 | * Context: Process context. |
261 | * Return: Pointer to new request. | |
fea511a6 | 262 | */ |
ef6b0807 | 263 | static struct p9_req_t * |
996d5b4d | 264 | p9_tag_alloc(struct p9_client *c, int8_t type, unsigned int max_size) |
fea511a6 | 265 | { |
996d5b4d | 266 | struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS); |
abfa034e | 267 | int alloc_msize = min(c->msize, max_size); |
996d5b4d | 268 | int tag; |
fea511a6 | 269 | |
996d5b4d | 270 | if (!req) |
72ea0321 | 271 | return ERR_PTR(-ENOMEM); |
fea511a6 | 272 | |
91a76be3 | 273 | if (p9_fcall_init(c, &req->tc, alloc_msize)) |
523adb6c | 274 | goto free_req; |
91a76be3 | 275 | if (p9_fcall_init(c, &req->rc, alloc_msize)) |
996d5b4d | 276 | goto free; |
51a87c55 | 277 | |
523adb6c DM |
278 | p9pdu_reset(&req->tc); |
279 | p9pdu_reset(&req->rc); | |
0ce772fe | 280 | req->t_err = 0; |
51a87c55 | 281 | req->status = REQ_STATUS_ALLOC; |
996d5b4d MW |
282 | init_waitqueue_head(&req->wq); |
283 | INIT_LIST_HEAD(&req->req_list); | |
284 | ||
285 | idr_preload(GFP_NOFS); | |
286 | spin_lock_irq(&c->lock); | |
287 | if (type == P9_TVERSION) | |
288 | tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1, | |
289 | GFP_NOWAIT); | |
290 | else | |
291 | tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT); | |
523adb6c | 292 | req->tc.tag = tag; |
996d5b4d MW |
293 | spin_unlock_irq(&c->lock); |
294 | idr_preload_end(); | |
295 | if (tag < 0) | |
296 | goto free; | |
fea511a6 | 297 | |
728356de TB |
298 | /* Init ref to two because in the general case there is one ref |
299 | * that is put asynchronously by a writer thread, one ref | |
300 | * temporarily given by p9_tag_lookup and put by p9_client_cb | |
67dd8e44 | 301 | * in the recv thread, and one ref put by p9_req_put in the |
728356de TB |
302 | * main thread. The only exception is virtio that does not use |
303 | * p9_tag_lookup but does not have a writer thread either | |
304 | * (the write happens synchronously in the request/zc_request | |
305 | * callback), so p9_client_cb eats the second ref there | |
306 | * as the pointer is duplicated directly by virtqueue_add_sgs() | |
307 | */ | |
6cda1286 | 308 | refcount_set(&req->refcount, 2); |
728356de | 309 | |
ea071aa1 SD |
310 | return req; |
311 | ||
996d5b4d | 312 | free: |
523adb6c DM |
313 | p9_fcall_fini(&req->tc); |
314 | p9_fcall_fini(&req->rc); | |
315 | free_req: | |
996d5b4d | 316 | kmem_cache_free(p9_req_cache, req); |
ea071aa1 | 317 | return ERR_PTR(-ENOMEM); |
fea511a6 | 318 | } |
fea511a6 EVH |
319 | |
320 | /** | |
996d5b4d MW |
321 | * p9_tag_lookup - Look up a request by tag. |
322 | * @c: Client session. | |
323 | * @tag: Transaction ID. | |
fea511a6 | 324 | * |
996d5b4d MW |
325 | * Context: Any context. |
326 | * Return: A request, or %NULL if there is no request with that tag. | |
fea511a6 | 327 | */ |
fea511a6 EVH |
328 | struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) |
329 | { | |
996d5b4d | 330 | struct p9_req_t *req; |
fea511a6 | 331 | |
996d5b4d | 332 | rcu_read_lock(); |
728356de | 333 | again: |
996d5b4d | 334 | req = idr_find(&c->reqs, tag); |
728356de TB |
335 | if (req) { |
336 | /* We have to be careful with the req found under rcu_read_lock | |
337 | * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the | |
338 | * ref again without corrupting other data, then check again | |
339 | * that the tag matches once we have the ref | |
340 | */ | |
341 | if (!p9_req_try_get(req)) | |
342 | goto again; | |
343 | if (req->tc.tag != tag) { | |
8b11ff09 | 344 | p9_req_put(c, req); |
728356de TB |
345 | goto again; |
346 | } | |
347 | } | |
996d5b4d | 348 | rcu_read_unlock(); |
fea511a6 | 349 | |
996d5b4d | 350 | return req; |
fea511a6 EVH |
351 | } |
352 | EXPORT_SYMBOL(p9_tag_lookup); | |
353 | ||
354 | /** | |
43cbcbee | 355 | * p9_tag_remove - Remove a tag. |
996d5b4d | 356 | * @c: Client session. |
43cbcbee | 357 | * @r: Request of reference. |
fea511a6 | 358 | * |
996d5b4d | 359 | * Context: Any context. |
fea511a6 | 360 | */ |
67dd8e44 | 361 | static void p9_tag_remove(struct p9_client *c, struct p9_req_t *r) |
fea511a6 | 362 | { |
996d5b4d | 363 | unsigned long flags; |
523adb6c | 364 | u16 tag = r->tc.tag; |
fea511a6 | 365 | |
67dd8e44 | 366 | p9_debug(P9_DEBUG_MUX, "freeing clnt %p req %p tag: %d\n", c, r, tag); |
996d5b4d MW |
367 | spin_lock_irqsave(&c->lock, flags); |
368 | idr_remove(&c->reqs, tag); | |
369 | spin_unlock_irqrestore(&c->lock, flags); | |
728356de TB |
370 | } |
371 | ||
8b11ff09 | 372 | int p9_req_put(struct p9_client *c, struct p9_req_t *r) |
728356de | 373 | { |
6cda1286 | 374 | if (refcount_dec_and_test(&r->refcount)) { |
67dd8e44 | 375 | p9_tag_remove(c, r); |
6e195b0f | 376 | |
6cda1286 KO |
377 | p9_fcall_fini(&r->tc); |
378 | p9_fcall_fini(&r->rc); | |
379 | kmem_cache_free(p9_req_cache, r); | |
380 | return 1; | |
381 | } | |
382 | return 0; | |
728356de TB |
383 | } |
384 | EXPORT_SYMBOL(p9_req_put); | |
385 | ||
fea511a6 EVH |
386 | /** |
387 | * p9_tag_cleanup - cleans up tags structure and reclaims resources | |
0e15597e | 388 | * @c: v9fs client struct |
fea511a6 EVH |
389 | * |
390 | * This frees resources associated with the tags structure | |
391 | * | |
392 | */ | |
393 | static void p9_tag_cleanup(struct p9_client *c) | |
394 | { | |
996d5b4d MW |
395 | struct p9_req_t *req; |
396 | int id; | |
fea511a6 | 397 | |
996d5b4d MW |
398 | rcu_read_lock(); |
399 | idr_for_each_entry(&c->reqs, req, id) { | |
400 | pr_info("Tag %d still in use\n", id); | |
67dd8e44 | 401 | if (p9_req_put(c, req) == 0) |
728356de TB |
402 | pr_warn("Packet with tag %d has still references", |
403 | req->tc.tag); | |
fea511a6 | 404 | } |
996d5b4d | 405 | rcu_read_unlock(); |
673d62cd EVH |
406 | } |
407 | ||
91b8534f EVH |
408 | /** |
409 | * p9_client_cb - call back from transport to client | |
760b3d61 AL |
410 | * @c: client state |
411 | * @req: request received | |
412 | * @status: request status, one of REQ_STATUS_* | |
91b8534f EVH |
413 | * |
414 | */ | |
2b6e72ed | 415 | void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) |
91b8534f | 416 | { |
523adb6c | 417 | p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag); |
2b6e72ed | 418 | |
6e195b0f | 419 | /* This barrier is needed to make sure any change made to req before |
2d58f63f | 420 | * the status change is visible to another thread |
2b6e72ed DM |
421 | */ |
422 | smp_wmb(); | |
423 | req->status = status; | |
424 | ||
2557d0c5 | 425 | wake_up(&req->wq); |
523adb6c | 426 | p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag); |
8b11ff09 | 427 | p9_req_put(c, req); |
91b8534f EVH |
428 | } |
429 | EXPORT_SYMBOL(p9_client_cb); | |
430 | ||
51a87c55 EVH |
431 | /** |
432 | * p9_parse_header - parse header arguments out of a packet | |
433 | * @pdu: packet to parse | |
434 | * @size: size of packet | |
435 | * @type: type of request | |
436 | * @tag: tag of packet | |
437 | * @rewind: set if we need to rewind offset afterwards | |
438 | */ | |
439 | ||
440 | int | |
6e195b0f DM |
441 | p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, |
442 | int16_t *tag, int rewind) | |
51a87c55 | 443 | { |
6e195b0f DM |
444 | s8 r_type; |
445 | s16 r_tag; | |
446 | s32 r_size; | |
51a87c55 EVH |
447 | int offset = pdu->offset; |
448 | int err; | |
449 | ||
450 | pdu->offset = 0; | |
51a87c55 EVH |
451 | |
452 | err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); | |
453 | if (err) | |
454 | goto rewind_and_exit; | |
455 | ||
51a87c55 EVH |
456 | if (type) |
457 | *type = r_type; | |
458 | if (tag) | |
459 | *tag = r_tag; | |
460 | if (size) | |
461 | *size = r_size; | |
462 | ||
f984579a TB |
463 | if (pdu->size != r_size || r_size < 7) { |
464 | err = -EINVAL; | |
465 | goto rewind_and_exit; | |
466 | } | |
467 | ||
468 | pdu->id = r_type; | |
469 | pdu->tag = r_tag; | |
470 | ||
471 | p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", | |
472 | pdu->size, pdu->id, pdu->tag); | |
51a87c55 EVH |
473 | |
474 | rewind_and_exit: | |
475 | if (rewind) | |
476 | pdu->offset = offset; | |
477 | return err; | |
478 | } | |
479 | EXPORT_SYMBOL(p9_parse_header); | |
480 | ||
481 | /** | |
482 | * p9_check_errors - check 9p packet for error return and process it | |
483 | * @c: current client instance | |
484 | * @req: request to parse and check for error conditions | |
485 | * | |
486 | * returns error code if one is discovered, otherwise returns 0 | |
487 | * | |
488 | * this will have to be more complicated if we have multiple | |
489 | * error packet types | |
490 | */ | |
491 | ||
492 | static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) | |
493 | { | |
6e195b0f | 494 | s8 type; |
51a87c55 | 495 | int err; |
ca41bb3e | 496 | int ecode; |
51a87c55 | 497 | |
523adb6c DM |
498 | err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); |
499 | if (req->rc.size >= c->msize) { | |
f984579a TB |
500 | p9_debug(P9_DEBUG_ERROR, |
501 | "requested packet size too big: %d\n", | |
523adb6c | 502 | req->rc.size); |
f984579a TB |
503 | return -EIO; |
504 | } | |
6e195b0f | 505 | /* dump the response from server |
348b5901 AK |
506 | * This should be after check errors which poplulate pdu_fcall. |
507 | */ | |
523adb6c | 508 | trace_9p_protocol_dump(c, &req->rc); |
51a87c55 | 509 | if (err) { |
5d385153 | 510 | p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); |
51a87c55 EVH |
511 | return err; |
512 | } | |
ca41bb3e VJJ |
513 | if (type != P9_RERROR && type != P9_RLERROR) |
514 | return 0; | |
4f7ebe80 | 515 | |
ca41bb3e VJJ |
516 | if (!p9_is_proto_dotl(c)) { |
517 | char *ename; | |
6e195b0f | 518 | |
523adb6c | 519 | err = p9pdu_readf(&req->rc, c->proto_version, "s?d", |
abfa034e | 520 | &ename, &ecode); |
ca41bb3e VJJ |
521 | if (err) |
522 | goto out_err; | |
4f7ebe80 | 523 | |
287980e4 | 524 | if (p9_is_proto_dotu(c) && ecode < 512) |
ca41bb3e | 525 | err = -ecode; |
4f7ebe80 | 526 | |
287980e4 | 527 | if (!err) { |
ca41bb3e | 528 | err = p9_errstr2errno(ename, strlen(ename)); |
4f7ebe80 | 529 | |
5d385153 JP |
530 | p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", |
531 | -ecode, ename); | |
4f7ebe80 | 532 | } |
abfa034e | 533 | kfree(ename); |
ca41bb3e | 534 | } else { |
523adb6c | 535 | err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); |
27eb4c31 DM |
536 | if (err) |
537 | goto out_err; | |
ca41bb3e VJJ |
538 | err = -ecode; |
539 | ||
5d385153 | 540 | p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); |
ca41bb3e | 541 | } |
51a87c55 | 542 | |
51a87c55 | 543 | return err; |
4f7ebe80 AB |
544 | |
545 | out_err: | |
5d385153 | 546 | p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); |
4f7ebe80 AB |
547 | |
548 | return err; | |
51a87c55 EVH |
549 | } |
550 | ||
aca00763 RL |
551 | static struct p9_req_t * |
552 | p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); | |
553 | ||
51a87c55 EVH |
554 | /** |
555 | * p9_client_flush - flush (cancel) a request | |
0e15597e AK |
556 | * @c: client state |
557 | * @oldreq: request to cancel | |
51a87c55 | 558 | * |
aca00763 | 559 | * This sents a flush for a particular request and links |
51a87c55 EVH |
560 | * the flush request to the original request. The current |
561 | * code only supports a single flush request although the protocol | |
562 | * allows for multiple flush requests to be sent for a single request. | |
563 | * | |
564 | */ | |
565 | ||
566 | static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) | |
567 | { | |
568 | struct p9_req_t *req; | |
6e195b0f | 569 | s16 oldtag; |
51a87c55 EVH |
570 | int err; |
571 | ||
523adb6c | 572 | err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1); |
51a87c55 EVH |
573 | if (err) |
574 | return err; | |
575 | ||
5d385153 | 576 | p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); |
51a87c55 EVH |
577 | |
578 | req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); | |
579 | if (IS_ERR(req)) | |
580 | return PTR_ERR(req); | |
581 | ||
6e195b0f | 582 | /* if we haven't received a response for oldreq, |
60ff779c | 583 | * remove it from the list |
1cff3306 | 584 | */ |
728356de | 585 | if (oldreq->status == REQ_STATUS_SENT) { |
afd8d654 SD |
586 | if (c->trans_mod->cancelled) |
587 | c->trans_mod->cancelled(c, oldreq); | |
728356de | 588 | } |
1bab88b2 | 589 | |
67dd8e44 | 590 | p9_req_put(c, req); |
51a87c55 EVH |
591 | return 0; |
592 | } | |
593 | ||
abfa034e AK |
594 | static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, |
595 | int8_t type, int req_size, | |
596 | const char *fmt, va_list ap) | |
91b8534f | 597 | { |
996d5b4d | 598 | int err; |
91b8534f | 599 | struct p9_req_t *req; |
91b8534f | 600 | |
5d385153 | 601 | p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); |
91b8534f | 602 | |
6d96d3ab AK |
603 | /* we allow for any status other than disconnected */ |
604 | if (c->status == Disconnected) | |
605 | return ERR_PTR(-EIO); | |
606 | ||
607 | /* if status is begin_disconnected we allow only clunk request */ | |
6e195b0f | 608 | if (c->status == BeginDisconnect && type != P9_TCLUNK) |
51a87c55 | 609 | return ERR_PTR(-EIO); |
91b8534f | 610 | |
996d5b4d | 611 | req = p9_tag_alloc(c, type, req_size); |
51a87c55 EVH |
612 | if (IS_ERR(req)) |
613 | return req; | |
91b8534f | 614 | |
51a87c55 | 615 | /* marshall the data */ |
523adb6c DM |
616 | p9pdu_prepare(&req->tc, req->tc.tag, type); |
617 | err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap); | |
7b3bb3fe AK |
618 | if (err) |
619 | goto reterr; | |
523adb6c DM |
620 | p9pdu_finalize(c, &req->tc); |
621 | trace_9p_client_req(c, type, req->tc.tag); | |
abfa034e AK |
622 | return req; |
623 | reterr: | |
67dd8e44 | 624 | p9_req_put(c, req); |
728356de | 625 | /* We have to put also the 2nd reference as it won't be used */ |
8b11ff09 | 626 | p9_req_put(c, req); |
abfa034e AK |
627 | return ERR_PTR(err); |
628 | } | |
629 | ||
630 | /** | |
631 | * p9_client_rpc - issue a request and wait for a response | |
632 | * @c: client session | |
633 | * @type: type of request | |
634 | * @fmt: protocol format string (see protocol.c) | |
635 | * | |
67dd8e44 | 636 | * Returns request structure (which client must free using p9_req_put) |
abfa034e AK |
637 | */ |
638 | ||
639 | static struct p9_req_t * | |
640 | p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) | |
641 | { | |
642 | va_list ap; | |
643 | int sigpending, err; | |
644 | unsigned long flags; | |
645 | struct p9_req_t *req; | |
646 | ||
647 | va_start(ap, fmt); | |
648 | req = p9_client_prepare_req(c, type, c->msize, fmt, ap); | |
649 | va_end(ap); | |
650 | if (IS_ERR(req)) | |
651 | return req; | |
652 | ||
653 | if (signal_pending(current)) { | |
654 | sigpending = 1; | |
655 | clear_thread_flag(TIF_SIGPENDING); | |
6e195b0f | 656 | } else { |
abfa034e | 657 | sigpending = 0; |
6e195b0f | 658 | } |
91b8534f EVH |
659 | |
660 | err = c->trans_mod->request(c, req); | |
661 | if (err < 0) { | |
728356de | 662 | /* write won't happen */ |
8b11ff09 | 663 | p9_req_put(c, req); |
3cd79678 | 664 | if (err != -ERESTARTSYS && err != -EFAULT) |
52f44e0d | 665 | c->status = Disconnected; |
a8522243 | 666 | goto recalc_sigpending; |
91b8534f | 667 | } |
a314f274 | 668 | again: |
abfa034e | 669 | /* Wait for the response */ |
2557d0c5 | 670 | err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD); |
91b8534f | 671 | |
6e195b0f | 672 | /* Make sure our req is coherent with regard to updates in other |
2b6e72ed DM |
673 | * threads - echoes to wmb() in the callback |
674 | */ | |
675 | smp_rmb(); | |
676 | ||
6e195b0f DM |
677 | if (err == -ERESTARTSYS && c->status == Connected && |
678 | type == P9_TFLUSH) { | |
a314f274 JG |
679 | sigpending = 1; |
680 | clear_thread_flag(TIF_SIGPENDING); | |
681 | goto again; | |
682 | } | |
683 | ||
91b8534f | 684 | if (req->status == REQ_STATUS_ERROR) { |
5d385153 | 685 | p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); |
91b8534f | 686 | err = req->t_err; |
91b8534f | 687 | } |
6e195b0f | 688 | if (err == -ERESTARTSYS && c->status == Connected) { |
5d385153 | 689 | p9_debug(P9_DEBUG_MUX, "flushing\n"); |
91b8534f | 690 | sigpending = 1; |
91b8534f EVH |
691 | clear_thread_flag(TIF_SIGPENDING); |
692 | ||
1bab88b2 LI |
693 | if (c->trans_mod->cancel(c, req)) |
694 | p9_client_flush(c, req); | |
695 | ||
696 | /* if we received the response anyway, don't signal error */ | |
697 | if (req->status == REQ_STATUS_RCVD) | |
698 | err = 0; | |
91b8534f | 699 | } |
a8522243 | 700 | recalc_sigpending: |
91b8534f EVH |
701 | if (sigpending) { |
702 | spin_lock_irqsave(¤t->sighand->siglock, flags); | |
703 | recalc_sigpending(); | |
704 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); | |
705 | } | |
91b8534f EVH |
706 | if (err < 0) |
707 | goto reterr; | |
708 | ||
51a87c55 | 709 | err = p9_check_errors(c, req); |
523adb6c | 710 | trace_9p_client_res(c, type, req->rc.tag, err); |
348b5901 | 711 | if (!err) |
51a87c55 | 712 | return req; |
abfa034e | 713 | reterr: |
67dd8e44 | 714 | p9_req_put(c, req); |
43def35c | 715 | return ERR_PTR(safe_errno(err)); |
abfa034e AK |
716 | } |
717 | ||
718 | /** | |
719 | * p9_client_zc_rpc - issue a request and wait for a response | |
720 | * @c: client session | |
721 | * @type: type of request | |
4f3b35c1 AV |
722 | * @uidata: destination for zero copy read |
723 | * @uodata: source for zero copy write | |
abfa034e AK |
724 | * @inlen: read buffer size |
725 | * @olen: write buffer size | |
15e522a7 | 726 | * @in_hdrlen: reader header size, This is the size of response protocol data |
abfa034e AK |
727 | * @fmt: protocol format string (see protocol.c) |
728 | * | |
67dd8e44 | 729 | * Returns request structure (which client must free using p9_req_put) |
abfa034e AK |
730 | */ |
731 | static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, | |
4f3b35c1 AV |
732 | struct iov_iter *uidata, |
733 | struct iov_iter *uodata, | |
abfa034e | 734 | int inlen, int olen, int in_hdrlen, |
4f3b35c1 | 735 | const char *fmt, ...) |
abfa034e AK |
736 | { |
737 | va_list ap; | |
738 | int sigpending, err; | |
739 | unsigned long flags; | |
740 | struct p9_req_t *req; | |
741 | ||
742 | va_start(ap, fmt); | |
6e195b0f | 743 | /* We allocate a inline protocol data of only 4k bytes. |
abfa034e AK |
744 | * The actual content is passed in zero-copy fashion. |
745 | */ | |
746 | req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap); | |
747 | va_end(ap); | |
748 | if (IS_ERR(req)) | |
749 | return req; | |
750 | ||
751 | if (signal_pending(current)) { | |
752 | sigpending = 1; | |
753 | clear_thread_flag(TIF_SIGPENDING); | |
6e195b0f | 754 | } else { |
abfa034e | 755 | sigpending = 0; |
6e195b0f | 756 | } |
abfa034e | 757 | |
abfa034e | 758 | err = c->trans_mod->zc_request(c, req, uidata, uodata, |
4f3b35c1 | 759 | inlen, olen, in_hdrlen); |
abfa034e AK |
760 | if (err < 0) { |
761 | if (err == -EIO) | |
762 | c->status = Disconnected; | |
a84b69cb | 763 | if (err != -ERESTARTSYS) |
a8522243 | 764 | goto recalc_sigpending; |
abfa034e AK |
765 | } |
766 | if (req->status == REQ_STATUS_ERROR) { | |
5d385153 | 767 | p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); |
abfa034e AK |
768 | err = req->t_err; |
769 | } | |
6e195b0f | 770 | if (err == -ERESTARTSYS && c->status == Connected) { |
5d385153 | 771 | p9_debug(P9_DEBUG_MUX, "flushing\n"); |
abfa034e AK |
772 | sigpending = 1; |
773 | clear_thread_flag(TIF_SIGPENDING); | |
91b8534f | 774 | |
abfa034e AK |
775 | if (c->trans_mod->cancel(c, req)) |
776 | p9_client_flush(c, req); | |
777 | ||
778 | /* if we received the response anyway, don't signal error */ | |
779 | if (req->status == REQ_STATUS_RCVD) | |
780 | err = 0; | |
781 | } | |
a8522243 | 782 | recalc_sigpending: |
abfa034e AK |
783 | if (sigpending) { |
784 | spin_lock_irqsave(¤t->sighand->siglock, flags); | |
785 | recalc_sigpending(); | |
786 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); | |
787 | } | |
788 | if (err < 0) | |
789 | goto reterr; | |
790 | ||
f615625a | 791 | err = p9_check_errors(c, req); |
523adb6c | 792 | trace_9p_client_res(c, type, req->rc.tag, err); |
348b5901 | 793 | if (!err) |
abfa034e | 794 | return req; |
91b8534f | 795 | reterr: |
67dd8e44 | 796 | p9_req_put(c, req); |
43def35c | 797 | return ERR_PTR(safe_errno(err)); |
91b8534f EVH |
798 | } |
799 | ||
5503ac56 EVH |
800 | static struct p9_fid *p9_fid_create(struct p9_client *clnt) |
801 | { | |
9f3e9bbe | 802 | int ret; |
5503ac56 EVH |
803 | struct p9_fid *fid; |
804 | ||
5d385153 | 805 | p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); |
aa7aeee1 | 806 | fid = kzalloc(sizeof(*fid), GFP_KERNEL); |
5503ac56 | 807 | if (!fid) |
b5303be2 | 808 | return NULL; |
5503ac56 | 809 | |
5503ac56 | 810 | fid->mode = -1; |
f8b9d53a | 811 | fid->uid = current_fsuid(); |
5503ac56 | 812 | fid->clnt = clnt; |
ff5e72eb | 813 | refcount_set(&fid->count, 1); |
5503ac56 | 814 | |
f28cdf04 MW |
815 | idr_preload(GFP_KERNEL); |
816 | spin_lock_irq(&clnt->lock); | |
817 | ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1, | |
818 | GFP_NOWAIT); | |
819 | spin_unlock_irq(&clnt->lock); | |
820 | idr_preload_end(); | |
286c171b DM |
821 | if (!ret) { |
822 | trace_9p_fid_ref(fid, P9_FID_REF_CREATE); | |
f28cdf04 | 823 | return fid; |
286c171b | 824 | } |
5503ac56 | 825 | |
5503ac56 | 826 | kfree(fid); |
b5303be2 | 827 | return NULL; |
5503ac56 EVH |
828 | } |
829 | ||
830 | static void p9_fid_destroy(struct p9_fid *fid) | |
831 | { | |
832 | struct p9_client *clnt; | |
cac23d65 | 833 | unsigned long flags; |
5503ac56 | 834 | |
5d385153 | 835 | p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); |
286c171b | 836 | trace_9p_fid_ref(fid, P9_FID_REF_DESTROY); |
5503ac56 | 837 | clnt = fid->clnt; |
cac23d65 | 838 | spin_lock_irqsave(&clnt->lock, flags); |
f28cdf04 | 839 | idr_remove(&clnt->fids, fid->fid); |
cac23d65 | 840 | spin_unlock_irqrestore(&clnt->lock, flags); |
3e2796a9 | 841 | kfree(fid->rdir); |
5503ac56 EVH |
842 | kfree(fid); |
843 | } | |
8a0dc95f | 844 | |
286c171b DM |
845 | /* We also need to export tracepoint symbols for tracepoint_enabled() */ |
846 | EXPORT_TRACEPOINT_SYMBOL(9p_fid_ref); | |
847 | ||
848 | void do_trace_9p_fid_get(struct p9_fid *fid) | |
849 | { | |
850 | trace_9p_fid_ref(fid, P9_FID_REF_GET); | |
851 | } | |
852 | EXPORT_SYMBOL(do_trace_9p_fid_get); | |
853 | ||
854 | void do_trace_9p_fid_put(struct p9_fid *fid) | |
855 | { | |
856 | trace_9p_fid_ref(fid, P9_FID_REF_PUT); | |
857 | } | |
858 | EXPORT_SYMBOL(do_trace_9p_fid_put); | |
859 | ||
32a875ad | 860 | static int p9_client_version(struct p9_client *c) |
bd238fb4 | 861 | { |
6936bf60 | 862 | int err = 0; |
51a87c55 | 863 | struct p9_req_t *req; |
7913690d | 864 | char *version = NULL; |
51a87c55 | 865 | int msize; |
bd238fb4 | 866 | |
5d385153 JP |
867 | p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", |
868 | c->msize, c->proto_version); | |
c5a7697d SK |
869 | |
870 | switch (c->proto_version) { | |
45bc21ed | 871 | case p9_proto_2000L: |
c5a7697d | 872 | req = p9_client_rpc(c, P9_TVERSION, "ds", |
6e195b0f | 873 | c->msize, "9P2000.L"); |
c5a7697d SK |
874 | break; |
875 | case p9_proto_2000u: | |
876 | req = p9_client_rpc(c, P9_TVERSION, "ds", | |
6e195b0f | 877 | c->msize, "9P2000.u"); |
c5a7697d SK |
878 | break; |
879 | case p9_proto_legacy: | |
880 | req = p9_client_rpc(c, P9_TVERSION, "ds", | |
6e195b0f | 881 | c->msize, "9P2000"); |
c5a7697d SK |
882 | break; |
883 | default: | |
884 | return -EINVAL; | |
c5a7697d SK |
885 | } |
886 | ||
51a87c55 EVH |
887 | if (IS_ERR(req)) |
888 | return PTR_ERR(req); | |
6936bf60 | 889 | |
523adb6c | 890 | err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version); |
51a87c55 | 891 | if (err) { |
5d385153 | 892 | p9_debug(P9_DEBUG_9P, "version error %d\n", err); |
523adb6c | 893 | trace_9p_protocol_dump(c, &req->rc); |
6936bf60 | 894 | goto error; |
51a87c55 | 895 | } |
6936bf60 | 896 | |
5d385153 | 897 | p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); |
6e195b0f | 898 | if (!strncmp(version, "9P2000.L", 8)) { |
45bc21ed | 899 | c->proto_version = p9_proto_2000L; |
6e195b0f | 900 | } else if (!strncmp(version, "9P2000.u", 8)) { |
342fee1d | 901 | c->proto_version = p9_proto_2000u; |
6e195b0f | 902 | } else if (!strncmp(version, "9P2000", 6)) { |
342fee1d | 903 | c->proto_version = p9_proto_legacy; |
6e195b0f | 904 | } else { |
574d356b DM |
905 | p9_debug(P9_DEBUG_ERROR, |
906 | "server returned an unknown version: %s\n", version); | |
6936bf60 EVH |
907 | err = -EREMOTEIO; |
908 | goto error; | |
909 | } | |
910 | ||
574d356b DM |
911 | if (msize < 4096) { |
912 | p9_debug(P9_DEBUG_ERROR, | |
913 | "server returned a msize < 4096: %d\n", msize); | |
914 | err = -EREMOTEIO; | |
915 | goto error; | |
916 | } | |
51a87c55 EVH |
917 | if (msize < c->msize) |
918 | c->msize = msize; | |
6936bf60 EVH |
919 | |
920 | error: | |
51a87c55 | 921 | kfree(version); |
67dd8e44 | 922 | p9_req_put(c, req); |
6936bf60 EVH |
923 | |
924 | return err; | |
925 | } | |
6936bf60 EVH |
926 | |
927 | struct p9_client *p9_client_create(const char *dev_name, char *options) | |
928 | { | |
929 | int err; | |
930 | struct p9_client *clnt; | |
50192abe | 931 | char *client_id; |
6936bf60 EVH |
932 | |
933 | err = 0; | |
6e195b0f | 934 | clnt = kmalloc(sizeof(*clnt), GFP_KERNEL); |
bd238fb4 LI |
935 | if (!clnt) |
936 | return ERR_PTR(-ENOMEM); | |
937 | ||
72029fe8 | 938 | clnt->trans_mod = NULL; |
bb8ffdfc | 939 | clnt->trans = NULL; |
91a76be3 | 940 | clnt->fcall_cache = NULL; |
50192abe WD |
941 | |
942 | client_id = utsname()->nodename; | |
943 | memcpy(clnt->name, client_id, strlen(client_id) + 1); | |
944 | ||
bd238fb4 | 945 | spin_lock_init(&clnt->lock); |
f28cdf04 | 946 | idr_init(&clnt->fids); |
996d5b4d | 947 | idr_init(&clnt->reqs); |
fea511a6 | 948 | |
bb8ffdfc EVH |
949 | err = parse_opts(options, clnt); |
950 | if (err < 0) | |
996d5b4d | 951 | goto free_client; |
bb8ffdfc | 952 | |
a17d1720 AK |
953 | if (!clnt->trans_mod) |
954 | clnt->trans_mod = v9fs_get_default_trans(); | |
955 | ||
6e195b0f | 956 | if (!clnt->trans_mod) { |
8a0dc95f | 957 | err = -EPROTONOSUPPORT; |
5d385153 JP |
958 | p9_debug(P9_DEBUG_ERROR, |
959 | "No transport defined or default transport\n"); | |
996d5b4d | 960 | goto free_client; |
8781ff94 EVH |
961 | } |
962 | ||
5d385153 JP |
963 | p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", |
964 | clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); | |
8a0dc95f | 965 | |
8b81ef58 EVH |
966 | err = clnt->trans_mod->create(clnt, dev_name, options); |
967 | if (err) | |
f28cdf04 | 968 | goto put_trans; |
bd238fb4 | 969 | |
15e2721b | 970 | if (clnt->msize > clnt->trans_mod->maxsize) { |
c9ffb05c | 971 | clnt->msize = clnt->trans_mod->maxsize; |
15e2721b CS |
972 | pr_info("Limiting 'msize' to %d as this is the maximum " |
973 | "supported by transport %s\n", | |
974 | clnt->msize, clnt->trans_mod->name | |
975 | ); | |
976 | } | |
8a0dc95f | 977 | |
574d356b DM |
978 | if (clnt->msize < 4096) { |
979 | p9_debug(P9_DEBUG_ERROR, | |
980 | "Please specify a msize of at least 4k\n"); | |
981 | err = -EINVAL; | |
bb06c388 | 982 | goto close_trans; |
574d356b DM |
983 | } |
984 | ||
6936bf60 | 985 | err = p9_client_version(clnt); |
bd238fb4 | 986 | if (err) |
8781ff94 | 987 | goto close_trans; |
bd238fb4 | 988 | |
91a76be3 DM |
989 | /* P9_HDRSZ + 4 is the smallest packet header we can have that is |
990 | * followed by data accessed from userspace by read | |
991 | */ | |
992 | clnt->fcall_cache = | |
993 | kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize, | |
994 | 0, 0, P9_HDRSZ + 4, | |
995 | clnt->msize - (P9_HDRSZ + 4), | |
996 | NULL); | |
997 | ||
bd238fb4 LI |
998 | return clnt; |
999 | ||
8781ff94 EVH |
1000 | close_trans: |
1001 | clnt->trans_mod->close(clnt); | |
8781ff94 EVH |
1002 | put_trans: |
1003 | v9fs_put_trans(clnt->trans_mod); | |
1004 | free_client: | |
1005 | kfree(clnt); | |
bd238fb4 LI |
1006 | return ERR_PTR(err); |
1007 | } | |
1008 | EXPORT_SYMBOL(p9_client_create); | |
1009 | ||
1010 | void p9_client_destroy(struct p9_client *clnt) | |
1011 | { | |
f28cdf04 MW |
1012 | struct p9_fid *fid; |
1013 | int id; | |
bd238fb4 | 1014 | |
5d385153 | 1015 | p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); |
bd238fb4 | 1016 | |
8b81ef58 EVH |
1017 | if (clnt->trans_mod) |
1018 | clnt->trans_mod->close(clnt); | |
bd238fb4 | 1019 | |
72029fe8 TH |
1020 | v9fs_put_trans(clnt->trans_mod); |
1021 | ||
f28cdf04 | 1022 | idr_for_each_entry(&clnt->fids, fid, id) { |
5d385153 | 1023 | pr_info("Found fid %d not clunked\n", fid->fid); |
bd238fb4 | 1024 | p9_fid_destroy(fid); |
6d96d3ab | 1025 | } |
bd238fb4 | 1026 | |
fea511a6 EVH |
1027 | p9_tag_cleanup(clnt); |
1028 | ||
91a76be3 | 1029 | kmem_cache_destroy(clnt->fcall_cache); |
bd238fb4 LI |
1030 | kfree(clnt); |
1031 | } | |
1032 | EXPORT_SYMBOL(p9_client_destroy); | |
1033 | ||
1034 | void p9_client_disconnect(struct p9_client *clnt) | |
1035 | { | |
5d385153 | 1036 | p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); |
8b81ef58 | 1037 | clnt->status = Disconnected; |
bd238fb4 LI |
1038 | } |
1039 | EXPORT_SYMBOL(p9_client_disconnect); | |
1040 | ||
6d96d3ab AK |
1041 | void p9_client_begin_disconnect(struct p9_client *clnt) |
1042 | { | |
5d385153 | 1043 | p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); |
6d96d3ab AK |
1044 | clnt->status = BeginDisconnect; |
1045 | } | |
1046 | EXPORT_SYMBOL(p9_client_begin_disconnect); | |
1047 | ||
bd238fb4 | 1048 | struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, |
6e195b0f DM |
1049 | const char *uname, kuid_t n_uname, |
1050 | const char *aname) | |
bd238fb4 | 1051 | { |
348b5901 | 1052 | int err = 0; |
51a87c55 | 1053 | struct p9_req_t *req; |
bd238fb4 | 1054 | struct p9_fid *fid; |
51a87c55 | 1055 | struct p9_qid qid; |
bd238fb4 | 1056 | |
5d385153 JP |
1057 | p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", |
1058 | afid ? afid->fid : -1, uname, aname); | |
bd238fb4 | 1059 | fid = p9_fid_create(clnt); |
b5303be2 MW |
1060 | if (!fid) { |
1061 | err = -ENOMEM; | |
bd238fb4 LI |
1062 | goto error; |
1063 | } | |
21c9f5cc | 1064 | fid->uid = n_uname; |
bd238fb4 | 1065 | |
f791f7c5 | 1066 | req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, |
6e195b0f | 1067 | afid ? afid->fid : P9_NOFID, uname, aname, n_uname); |
51a87c55 EVH |
1068 | if (IS_ERR(req)) { |
1069 | err = PTR_ERR(req); | |
bd238fb4 LI |
1070 | goto error; |
1071 | } | |
1072 | ||
523adb6c | 1073 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid); |
51a87c55 | 1074 | if (err) { |
523adb6c | 1075 | trace_9p_protocol_dump(clnt, &req->rc); |
67dd8e44 | 1076 | p9_req_put(clnt, req); |
bd238fb4 | 1077 | goto error; |
51a87c55 | 1078 | } |
bd238fb4 | 1079 | |
5d385153 | 1080 | p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", |
6e195b0f | 1081 | qid.type, qid.path, qid.version); |
51a87c55 EVH |
1082 | |
1083 | memmove(&fid->qid, &qid, sizeof(struct p9_qid)); | |
1084 | ||
67dd8e44 | 1085 | p9_req_put(clnt, req); |
bd238fb4 LI |
1086 | return fid; |
1087 | ||
1088 | error: | |
bd238fb4 LI |
1089 | if (fid) |
1090 | p9_fid_destroy(fid); | |
1091 | return ERR_PTR(err); | |
1092 | } | |
1093 | EXPORT_SYMBOL(p9_client_attach); | |
1094 | ||
b76225e2 | 1095 | struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, |
6e195b0f | 1096 | const unsigned char * const *wnames, int clone) |
bd238fb4 LI |
1097 | { |
1098 | int err; | |
bd238fb4 LI |
1099 | struct p9_client *clnt; |
1100 | struct p9_fid *fid; | |
51a87c55 EVH |
1101 | struct p9_qid *wqids; |
1102 | struct p9_req_t *req; | |
6e195b0f | 1103 | u16 nwqids, count; |
bd238fb4 | 1104 | |
bd238fb4 | 1105 | err = 0; |
62b2be59 | 1106 | wqids = NULL; |
bd238fb4 LI |
1107 | clnt = oldfid->clnt; |
1108 | if (clone) { | |
1109 | fid = p9_fid_create(clnt); | |
b5303be2 MW |
1110 | if (!fid) { |
1111 | err = -ENOMEM; | |
bd238fb4 LI |
1112 | goto error; |
1113 | } | |
1114 | ||
1115 | fid->uid = oldfid->uid; | |
6e195b0f | 1116 | } else { |
bd238fb4 | 1117 | fid = oldfid; |
6e195b0f | 1118 | } |
51a87c55 | 1119 | |
5d385153 JP |
1120 | p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", |
1121 | oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); | |
51a87c55 | 1122 | req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, |
6e195b0f | 1123 | nwname, wnames); |
51a87c55 EVH |
1124 | if (IS_ERR(req)) { |
1125 | err = PTR_ERR(req); | |
bd238fb4 LI |
1126 | goto error; |
1127 | } | |
1128 | ||
523adb6c | 1129 | err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids); |
e7f4b8f1 | 1130 | if (err) { |
523adb6c | 1131 | trace_9p_protocol_dump(clnt, &req->rc); |
67dd8e44 | 1132 | p9_req_put(clnt, req); |
51a87c55 | 1133 | goto clunk_fid; |
e7f4b8f1 | 1134 | } |
67dd8e44 | 1135 | p9_req_put(clnt, req); |
bd238fb4 | 1136 | |
5d385153 | 1137 | p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); |
51a87c55 EVH |
1138 | |
1139 | if (nwqids != nwname) { | |
bd238fb4 LI |
1140 | err = -ENOENT; |
1141 | goto clunk_fid; | |
1142 | } | |
1143 | ||
51a87c55 | 1144 | for (count = 0; count < nwqids; count++) |
5d385153 | 1145 | p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", |
6e195b0f DM |
1146 | count, wqids[count].type, |
1147 | wqids[count].path, | |
1148 | wqids[count].version); | |
51a87c55 | 1149 | |
bd238fb4 | 1150 | if (nwname) |
51a87c55 | 1151 | memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); |
bd238fb4 | 1152 | else |
154372e6 | 1153 | memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid)); |
bd238fb4 | 1154 | |
62b2be59 | 1155 | kfree(wqids); |
bd238fb4 LI |
1156 | return fid; |
1157 | ||
1158 | clunk_fid: | |
62b2be59 | 1159 | kfree(wqids); |
b48dbb99 | 1160 | p9_fid_put(fid); |
51a87c55 | 1161 | fid = NULL; |
bd238fb4 LI |
1162 | |
1163 | error: | |
6e195b0f | 1164 | if (fid && fid != oldfid) |
bd238fb4 LI |
1165 | p9_fid_destroy(fid); |
1166 | ||
1167 | return ERR_PTR(err); | |
1168 | } | |
1169 | EXPORT_SYMBOL(p9_client_walk); | |
1170 | ||
1171 | int p9_client_open(struct p9_fid *fid, int mode) | |
1172 | { | |
1173 | int err; | |
bd238fb4 | 1174 | struct p9_client *clnt; |
51a87c55 EVH |
1175 | struct p9_req_t *req; |
1176 | struct p9_qid qid; | |
1177 | int iounit; | |
bd238fb4 | 1178 | |
bd238fb4 | 1179 | clnt = fid->clnt; |
5d385153 | 1180 | p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", |
6e195b0f | 1181 | p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); |
ef56547e | 1182 | err = 0; |
bd238fb4 LI |
1183 | |
1184 | if (fid->mode != -1) | |
1185 | return -EINVAL; | |
1186 | ||
ef56547e MK |
1187 | if (p9_is_proto_dotl(clnt)) |
1188 | req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); | |
1189 | else | |
1190 | req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); | |
51a87c55 EVH |
1191 | if (IS_ERR(req)) { |
1192 | err = PTR_ERR(req); | |
1193 | goto error; | |
bd238fb4 LI |
1194 | } |
1195 | ||
523adb6c | 1196 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); |
e7f4b8f1 | 1197 | if (err) { |
523adb6c | 1198 | trace_9p_protocol_dump(clnt, &req->rc); |
e7f4b8f1 EVH |
1199 | goto free_and_error; |
1200 | } | |
51a87c55 | 1201 | |
5d385153 | 1202 | p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", |
6e195b0f DM |
1203 | p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, |
1204 | qid.path, qid.version, iounit); | |
bd238fb4 | 1205 | |
154372e6 | 1206 | memmove(&fid->qid, &qid, sizeof(struct p9_qid)); |
bd238fb4 | 1207 | fid->mode = mode; |
51a87c55 | 1208 | fid->iounit = iounit; |
bd238fb4 | 1209 | |
e7f4b8f1 | 1210 | free_and_error: |
67dd8e44 | 1211 | p9_req_put(clnt, req); |
51a87c55 | 1212 | error: |
bd238fb4 LI |
1213 | return err; |
1214 | } | |
1215 | EXPORT_SYMBOL(p9_client_open); | |
1216 | ||
6e195b0f DM |
1217 | int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, |
1218 | u32 mode, kgid_t gid, struct p9_qid *qid) | |
5643135a VJJ |
1219 | { |
1220 | int err = 0; | |
1221 | struct p9_client *clnt; | |
1222 | struct p9_req_t *req; | |
1223 | int iounit; | |
1224 | ||
5d385153 | 1225 | p9_debug(P9_DEBUG_9P, |
6e195b0f DM |
1226 | ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", |
1227 | ofid->fid, name, flags, mode, | |
1228 | from_kgid(&init_user_ns, gid)); | |
5643135a VJJ |
1229 | clnt = ofid->clnt; |
1230 | ||
1231 | if (ofid->mode != -1) | |
1232 | return -EINVAL; | |
1233 | ||
f791f7c5 | 1234 | req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, |
6e195b0f | 1235 | mode, gid); |
5643135a VJJ |
1236 | if (IS_ERR(req)) { |
1237 | err = PTR_ERR(req); | |
1238 | goto error; | |
1239 | } | |
1240 | ||
523adb6c | 1241 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit); |
5643135a | 1242 | if (err) { |
523adb6c | 1243 | trace_9p_protocol_dump(clnt, &req->rc); |
5643135a VJJ |
1244 | goto free_and_error; |
1245 | } | |
1246 | ||
5d385153 | 1247 | p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", |
6e195b0f | 1248 | qid->type, qid->path, qid->version, iounit); |
5643135a | 1249 | |
154372e6 | 1250 | memmove(&ofid->qid, qid, sizeof(struct p9_qid)); |
5643135a VJJ |
1251 | ofid->mode = mode; |
1252 | ofid->iounit = iounit; | |
1253 | ||
1254 | free_and_error: | |
67dd8e44 | 1255 | p9_req_put(clnt, req); |
5643135a VJJ |
1256 | error: |
1257 | return err; | |
1258 | } | |
1259 | EXPORT_SYMBOL(p9_client_create_dotl); | |
1260 | ||
7880b43b | 1261 | int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, |
bd238fb4 LI |
1262 | char *extension) |
1263 | { | |
1264 | int err; | |
bd238fb4 | 1265 | struct p9_client *clnt; |
51a87c55 EVH |
1266 | struct p9_req_t *req; |
1267 | struct p9_qid qid; | |
1268 | int iounit; | |
bd238fb4 | 1269 | |
5d385153 | 1270 | p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", |
6e195b0f | 1271 | fid->fid, name, perm, mode); |
bd238fb4 | 1272 | err = 0; |
bd238fb4 LI |
1273 | clnt = fid->clnt; |
1274 | ||
1275 | if (fid->mode != -1) | |
1276 | return -EINVAL; | |
1277 | ||
51a87c55 | 1278 | req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, |
6e195b0f | 1279 | mode, extension); |
51a87c55 EVH |
1280 | if (IS_ERR(req)) { |
1281 | err = PTR_ERR(req); | |
1282 | goto error; | |
bd238fb4 LI |
1283 | } |
1284 | ||
523adb6c | 1285 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); |
e7f4b8f1 | 1286 | if (err) { |
523adb6c | 1287 | trace_9p_protocol_dump(clnt, &req->rc); |
e7f4b8f1 EVH |
1288 | goto free_and_error; |
1289 | } | |
51a87c55 | 1290 | |
5d385153 | 1291 | p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", |
6e195b0f | 1292 | qid.type, qid.path, qid.version, iounit); |
bd238fb4 | 1293 | |
154372e6 | 1294 | memmove(&fid->qid, &qid, sizeof(struct p9_qid)); |
bd238fb4 | 1295 | fid->mode = mode; |
51a87c55 | 1296 | fid->iounit = iounit; |
bd238fb4 | 1297 | |
e7f4b8f1 | 1298 | free_and_error: |
67dd8e44 | 1299 | p9_req_put(clnt, req); |
51a87c55 | 1300 | error: |
bd238fb4 LI |
1301 | return err; |
1302 | } | |
1303 | EXPORT_SYMBOL(p9_client_fcreate); | |
1304 | ||
7880b43b | 1305 | int p9_client_symlink(struct p9_fid *dfid, const char *name, |
6e195b0f | 1306 | const char *symtgt, kgid_t gid, struct p9_qid *qid) |
50cc42ff VJJ |
1307 | { |
1308 | int err = 0; | |
1309 | struct p9_client *clnt; | |
1310 | struct p9_req_t *req; | |
1311 | ||
5d385153 | 1312 | p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", |
6e195b0f | 1313 | dfid->fid, name, symtgt); |
50cc42ff VJJ |
1314 | clnt = dfid->clnt; |
1315 | ||
f791f7c5 | 1316 | req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, |
6e195b0f | 1317 | gid); |
50cc42ff VJJ |
1318 | if (IS_ERR(req)) { |
1319 | err = PTR_ERR(req); | |
1320 | goto error; | |
1321 | } | |
1322 | ||
523adb6c | 1323 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); |
50cc42ff | 1324 | if (err) { |
523adb6c | 1325 | trace_9p_protocol_dump(clnt, &req->rc); |
50cc42ff VJJ |
1326 | goto free_and_error; |
1327 | } | |
1328 | ||
5d385153 | 1329 | p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", |
6e195b0f | 1330 | qid->type, qid->path, qid->version); |
50cc42ff VJJ |
1331 | |
1332 | free_and_error: | |
67dd8e44 | 1333 | p9_req_put(clnt, req); |
50cc42ff VJJ |
1334 | error: |
1335 | return err; | |
1336 | } | |
1337 | EXPORT_SYMBOL(p9_client_symlink); | |
1338 | ||
7880b43b | 1339 | int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) |
652df9a7 VJJ |
1340 | { |
1341 | struct p9_client *clnt; | |
1342 | struct p9_req_t *req; | |
1343 | ||
5d385153 | 1344 | p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", |
6e195b0f | 1345 | dfid->fid, oldfid->fid, newname); |
652df9a7 VJJ |
1346 | clnt = dfid->clnt; |
1347 | req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, | |
6e195b0f | 1348 | newname); |
652df9a7 VJJ |
1349 | if (IS_ERR(req)) |
1350 | return PTR_ERR(req); | |
1351 | ||
5d385153 | 1352 | p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); |
67dd8e44 | 1353 | p9_req_put(clnt, req); |
652df9a7 VJJ |
1354 | return 0; |
1355 | } | |
1356 | EXPORT_SYMBOL(p9_client_link); | |
1357 | ||
b165d601 | 1358 | int p9_client_fsync(struct p9_fid *fid, int datasync) |
920e65dc VJJ |
1359 | { |
1360 | int err; | |
1361 | struct p9_client *clnt; | |
1362 | struct p9_req_t *req; | |
1363 | ||
5d385153 | 1364 | p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", |
6e195b0f | 1365 | fid->fid, datasync); |
920e65dc VJJ |
1366 | err = 0; |
1367 | clnt = fid->clnt; | |
1368 | ||
b165d601 | 1369 | req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); |
920e65dc VJJ |
1370 | if (IS_ERR(req)) { |
1371 | err = PTR_ERR(req); | |
1372 | goto error; | |
1373 | } | |
1374 | ||
5d385153 | 1375 | p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); |
920e65dc | 1376 | |
67dd8e44 | 1377 | p9_req_put(clnt, req); |
920e65dc VJJ |
1378 | |
1379 | error: | |
1380 | return err; | |
1381 | } | |
1382 | EXPORT_SYMBOL(p9_client_fsync); | |
1383 | ||
bd238fb4 LI |
1384 | int p9_client_clunk(struct p9_fid *fid) |
1385 | { | |
1386 | int err; | |
bd238fb4 | 1387 | struct p9_client *clnt; |
51a87c55 | 1388 | struct p9_req_t *req; |
208f3c28 | 1389 | int retries = 0; |
bd238fb4 | 1390 | |
208f3c28 | 1391 | again: |
6e195b0f DM |
1392 | p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", |
1393 | fid->fid, retries); | |
bd238fb4 | 1394 | err = 0; |
bd238fb4 LI |
1395 | clnt = fid->clnt; |
1396 | ||
51a87c55 EVH |
1397 | req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); |
1398 | if (IS_ERR(req)) { | |
1399 | err = PTR_ERR(req); | |
1400 | goto error; | |
bd238fb4 LI |
1401 | } |
1402 | ||
5d385153 | 1403 | p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); |
bd238fb4 | 1404 | |
67dd8e44 | 1405 | p9_req_put(clnt, req); |
51a87c55 | 1406 | error: |
6e195b0f | 1407 | /* Fid is not valid even after a failed clunk |
208f3c28 JG |
1408 | * If interrupted, retry once then give up and |
1409 | * leak fid until umount. | |
5034990e | 1410 | */ |
208f3c28 JG |
1411 | if (err == -ERESTARTSYS) { |
1412 | if (retries++ == 0) | |
1413 | goto again; | |
6e195b0f | 1414 | } else { |
208f3c28 | 1415 | p9_fid_destroy(fid); |
6e195b0f | 1416 | } |
bd238fb4 LI |
1417 | return err; |
1418 | } | |
1419 | EXPORT_SYMBOL(p9_client_clunk); | |
1420 | ||
1421 | int p9_client_remove(struct p9_fid *fid) | |
1422 | { | |
1423 | int err; | |
bd238fb4 | 1424 | struct p9_client *clnt; |
51a87c55 | 1425 | struct p9_req_t *req; |
bd238fb4 | 1426 | |
5d385153 | 1427 | p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); |
bd238fb4 | 1428 | err = 0; |
bd238fb4 LI |
1429 | clnt = fid->clnt; |
1430 | ||
51a87c55 EVH |
1431 | req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); |
1432 | if (IS_ERR(req)) { | |
1433 | err = PTR_ERR(req); | |
1434 | goto error; | |
bd238fb4 LI |
1435 | } |
1436 | ||
5d385153 | 1437 | p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); |
bd238fb4 | 1438 | |
67dd8e44 | 1439 | p9_req_put(clnt, req); |
51a87c55 | 1440 | error: |
208f3c28 | 1441 | if (err == -ERESTARTSYS) |
b48dbb99 | 1442 | p9_fid_put(fid); |
208f3c28 JG |
1443 | else |
1444 | p9_fid_destroy(fid); | |
bd238fb4 LI |
1445 | return err; |
1446 | } | |
1447 | EXPORT_SYMBOL(p9_client_remove); | |
1448 | ||
48e370ff AK |
1449 | int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) |
1450 | { | |
1451 | int err = 0; | |
1452 | struct p9_req_t *req; | |
1453 | struct p9_client *clnt; | |
1454 | ||
5d385153 | 1455 | p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", |
6e195b0f | 1456 | dfid->fid, name, flags); |
48e370ff AK |
1457 | |
1458 | clnt = dfid->clnt; | |
1459 | req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); | |
1460 | if (IS_ERR(req)) { | |
1461 | err = PTR_ERR(req); | |
1462 | goto error; | |
1463 | } | |
5d385153 | 1464 | p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); |
48e370ff | 1465 | |
67dd8e44 | 1466 | p9_req_put(clnt, req); |
48e370ff AK |
1467 | error: |
1468 | return err; | |
1469 | } | |
1470 | EXPORT_SYMBOL(p9_client_unlinkat); | |
1471 | ||
0fc9655e | 1472 | int |
e1200fe6 | 1473 | p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) |
bd238fb4 | 1474 | { |
e1200fe6 | 1475 | int total = 0; |
999b8b88 | 1476 | *err = 0; |
bd238fb4 | 1477 | |
388f6966 SA |
1478 | while (iov_iter_count(to)) { |
1479 | int count; | |
1480 | ||
1481 | count = p9_client_read_once(fid, offset, to, err); | |
1482 | if (!count || *err) | |
1483 | break; | |
1484 | offset += count; | |
1485 | total += count; | |
1486 | } | |
1487 | return total; | |
1488 | } | |
1489 | EXPORT_SYMBOL(p9_client_read); | |
1490 | ||
1491 | int | |
1492 | p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to, | |
1493 | int *err) | |
1494 | { | |
1495 | struct p9_client *clnt = fid->clnt; | |
1496 | struct p9_req_t *req; | |
1497 | int count = iov_iter_count(to); | |
7f024647 | 1498 | int rsize, received, non_zc = 0; |
388f6966 SA |
1499 | char *dataptr; |
1500 | ||
1501 | *err = 0; | |
6e195b0f DM |
1502 | p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %zu\n", |
1503 | fid->fid, offset, iov_iter_count(to)); | |
e1200fe6 | 1504 | |
388f6966 SA |
1505 | rsize = fid->iounit; |
1506 | if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) | |
1507 | rsize = clnt->msize - P9_IOHDRSZ; | |
c69f297d | 1508 | |
388f6966 SA |
1509 | if (count < rsize) |
1510 | rsize = count; | |
e1200fe6 | 1511 | |
388f6966 SA |
1512 | /* Don't bother zerocopy for small IO (< 1024) */ |
1513 | if (clnt->trans_mod->zc_request && rsize > 1024) { | |
1514 | /* response header len is 11 | |
1515 | * PDU Header(7) + IO Size (4) | |
1516 | */ | |
1517 | req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, | |
1518 | 0, 11, "dqd", fid->fid, | |
1519 | offset, rsize); | |
1520 | } else { | |
1521 | non_zc = 1; | |
1522 | req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, | |
1523 | rsize); | |
1524 | } | |
1525 | if (IS_ERR(req)) { | |
1526 | *err = PTR_ERR(req); | |
7f024647 AV |
1527 | if (!non_zc) |
1528 | iov_iter_revert(to, count - iov_iter_count(to)); | |
388f6966 SA |
1529 | return 0; |
1530 | } | |
e1200fe6 | 1531 | |
388f6966 | 1532 | *err = p9pdu_readf(&req->rc, clnt->proto_version, |
7f024647 | 1533 | "D", &received, &dataptr); |
388f6966 | 1534 | if (*err) { |
7f024647 AV |
1535 | if (!non_zc) |
1536 | iov_iter_revert(to, count - iov_iter_count(to)); | |
388f6966 | 1537 | trace_9p_protocol_dump(clnt, &req->rc); |
67dd8e44 | 1538 | p9_req_put(clnt, req); |
388f6966 SA |
1539 | return 0; |
1540 | } | |
7f024647 AV |
1541 | if (rsize < received) { |
1542 | pr_err("bogus RREAD count (%d > %d)\n", received, rsize); | |
1543 | received = rsize; | |
388f6966 | 1544 | } |
bd238fb4 | 1545 | |
388f6966 | 1546 | p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); |
bd238fb4 | 1547 | |
388f6966 | 1548 | if (non_zc) { |
7f024647 | 1549 | int n = copy_to_iter(dataptr, received, to); |
bd238fb4 | 1550 | |
7f024647 | 1551 | if (n != received) { |
388f6966 | 1552 | *err = -EFAULT; |
67dd8e44 | 1553 | p9_req_put(clnt, req); |
388f6966 | 1554 | return n; |
e1200fe6 | 1555 | } |
388f6966 | 1556 | } else { |
7f024647 | 1557 | iov_iter_revert(to, count - received - iov_iter_count(to)); |
51a87c55 | 1558 | } |
67dd8e44 | 1559 | p9_req_put(clnt, req); |
7f024647 | 1560 | return received; |
bd238fb4 | 1561 | } |
388f6966 | 1562 | EXPORT_SYMBOL(p9_client_read_once); |
bd238fb4 LI |
1563 | |
1564 | int | |
070b3656 | 1565 | p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) |
bd238fb4 | 1566 | { |
070b3656 | 1567 | struct p9_client *clnt = fid->clnt; |
51a87c55 | 1568 | struct p9_req_t *req; |
070b3656 | 1569 | int total = 0; |
999b8b88 | 1570 | *err = 0; |
070b3656 AV |
1571 | |
1572 | p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n", | |
6e195b0f | 1573 | fid->fid, offset, iov_iter_count(from)); |
070b3656 AV |
1574 | |
1575 | while (iov_iter_count(from)) { | |
1576 | int count = iov_iter_count(from); | |
1577 | int rsize = fid->iounit; | |
7f024647 | 1578 | int written; |
6e195b0f DM |
1579 | |
1580 | if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) | |
070b3656 AV |
1581 | rsize = clnt->msize - P9_IOHDRSZ; |
1582 | ||
1583 | if (count < rsize) | |
1584 | rsize = count; | |
1585 | ||
1586 | /* Don't bother zerocopy for small IO (< 1024) */ | |
1587 | if (clnt->trans_mod->zc_request && rsize > 1024) { | |
1588 | req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, | |
1589 | rsize, P9_ZC_HDR_SZ, "dqd", | |
1590 | fid->fid, offset, rsize); | |
1591 | } else { | |
1592 | req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, | |
6e195b0f | 1593 | offset, rsize, from); |
070b3656 AV |
1594 | } |
1595 | if (IS_ERR(req)) { | |
7f024647 | 1596 | iov_iter_revert(from, count - iov_iter_count(from)); |
070b3656 AV |
1597 | *err = PTR_ERR(req); |
1598 | break; | |
1599 | } | |
bd238fb4 | 1600 | |
7f024647 | 1601 | *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &written); |
070b3656 | 1602 | if (*err) { |
7f024647 | 1603 | iov_iter_revert(from, count - iov_iter_count(from)); |
523adb6c | 1604 | trace_9p_protocol_dump(clnt, &req->rc); |
67dd8e44 | 1605 | p9_req_put(clnt, req); |
67e808fb | 1606 | break; |
070b3656 | 1607 | } |
7f024647 AV |
1608 | if (rsize < written) { |
1609 | pr_err("bogus RWRITE count (%d > %d)\n", written, rsize); | |
1610 | written = rsize; | |
0f1db7de | 1611 | } |
1fc52481 | 1612 | |
070b3656 | 1613 | p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); |
0fc9655e | 1614 | |
67dd8e44 | 1615 | p9_req_put(clnt, req); |
7f024647 AV |
1616 | iov_iter_revert(from, count - written - iov_iter_count(from)); |
1617 | total += written; | |
1618 | offset += written; | |
e7f4b8f1 | 1619 | } |
070b3656 | 1620 | return total; |
bd238fb4 | 1621 | } |
0fc9655e | 1622 | EXPORT_SYMBOL(p9_client_write); |
bd238fb4 | 1623 | |
51a87c55 | 1624 | struct p9_wstat *p9_client_stat(struct p9_fid *fid) |
5503ac56 | 1625 | { |
51a87c55 EVH |
1626 | int err; |
1627 | struct p9_client *clnt; | |
6e195b0f | 1628 | struct p9_wstat *ret; |
51a87c55 EVH |
1629 | struct p9_req_t *req; |
1630 | u16 ignored; | |
5503ac56 | 1631 | |
5d385153 | 1632 | p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); |
5503ac56 | 1633 | |
6e195b0f | 1634 | ret = kmalloc(sizeof(*ret), GFP_KERNEL); |
5503ac56 EVH |
1635 | if (!ret) |
1636 | return ERR_PTR(-ENOMEM); | |
1637 | ||
bd238fb4 | 1638 | err = 0; |
bd238fb4 LI |
1639 | clnt = fid->clnt; |
1640 | ||
51a87c55 EVH |
1641 | req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); |
1642 | if (IS_ERR(req)) { | |
1643 | err = PTR_ERR(req); | |
bd238fb4 LI |
1644 | goto error; |
1645 | } | |
1646 | ||
523adb6c | 1647 | err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret); |
e7f4b8f1 | 1648 | if (err) { |
523adb6c | 1649 | trace_9p_protocol_dump(clnt, &req->rc); |
67dd8e44 | 1650 | p9_req_put(clnt, req); |
eedfe1c4 | 1651 | goto error; |
e7f4b8f1 | 1652 | } |
bd238fb4 | 1653 | |
5d385153 | 1654 | p9_debug(P9_DEBUG_9P, |
6e195b0f DM |
1655 | "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" |
1656 | "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" | |
1657 | "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" | |
1658 | "<<< uid=%d gid=%d n_muid=%d\n", | |
1659 | ret->size, ret->type, ret->dev, ret->qid.type, ret->qid.path, | |
1660 | ret->qid.version, ret->mode, | |
1661 | ret->atime, ret->mtime, ret->length, | |
1662 | ret->name, ret->uid, ret->gid, ret->muid, ret->extension, | |
1663 | from_kuid(&init_user_ns, ret->n_uid), | |
1664 | from_kgid(&init_user_ns, ret->n_gid), | |
1665 | from_kuid(&init_user_ns, ret->n_muid)); | |
bd238fb4 | 1666 | |
67dd8e44 | 1667 | p9_req_put(clnt, req); |
742b11a7 LI |
1668 | return ret; |
1669 | ||
bd238fb4 | 1670 | error: |
742b11a7 LI |
1671 | kfree(ret); |
1672 | return ERR_PTR(err); | |
bd238fb4 LI |
1673 | } |
1674 | EXPORT_SYMBOL(p9_client_stat); | |
1675 | ||
f0853122 | 1676 | struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, |
6e195b0f | 1677 | u64 request_mask) |
f0853122 SK |
1678 | { |
1679 | int err; | |
1680 | struct p9_client *clnt; | |
6e195b0f | 1681 | struct p9_stat_dotl *ret; |
f0853122 SK |
1682 | struct p9_req_t *req; |
1683 | ||
5d385153 | 1684 | p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", |
6e195b0f | 1685 | fid->fid, request_mask); |
f0853122 | 1686 | |
6e195b0f | 1687 | ret = kmalloc(sizeof(*ret), GFP_KERNEL); |
f0853122 SK |
1688 | if (!ret) |
1689 | return ERR_PTR(-ENOMEM); | |
1690 | ||
1691 | err = 0; | |
1692 | clnt = fid->clnt; | |
1693 | ||
1694 | req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); | |
1695 | if (IS_ERR(req)) { | |
1696 | err = PTR_ERR(req); | |
1697 | goto error; | |
1698 | } | |
1699 | ||
523adb6c | 1700 | err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret); |
f0853122 | 1701 | if (err) { |
523adb6c | 1702 | trace_9p_protocol_dump(clnt, &req->rc); |
67dd8e44 | 1703 | p9_req_put(clnt, req); |
f0853122 SK |
1704 | goto error; |
1705 | } | |
1706 | ||
6e195b0f DM |
1707 | p9_debug(P9_DEBUG_9P, "<<< RGETATTR st_result_mask=%lld\n" |
1708 | "<<< qid=%x.%llx.%x\n" | |
1709 | "<<< st_mode=%8.8x st_nlink=%llu\n" | |
1710 | "<<< st_uid=%d st_gid=%d\n" | |
1711 | "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" | |
1712 | "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" | |
1713 | "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" | |
1714 | "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" | |
1715 | "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" | |
1716 | "<<< st_gen=%lld st_data_version=%lld\n", | |
1717 | ret->st_result_mask, | |
1718 | ret->qid.type, ret->qid.path, ret->qid.version, | |
1719 | ret->st_mode, ret->st_nlink, | |
1720 | from_kuid(&init_user_ns, ret->st_uid), | |
1721 | from_kgid(&init_user_ns, ret->st_gid), | |
1722 | ret->st_rdev, ret->st_size, ret->st_blksize, ret->st_blocks, | |
1723 | ret->st_atime_sec, ret->st_atime_nsec, | |
1724 | ret->st_mtime_sec, ret->st_mtime_nsec, | |
1725 | ret->st_ctime_sec, ret->st_ctime_nsec, | |
1726 | ret->st_btime_sec, ret->st_btime_nsec, | |
1727 | ret->st_gen, ret->st_data_version); | |
f0853122 | 1728 | |
67dd8e44 | 1729 | p9_req_put(clnt, req); |
f0853122 SK |
1730 | return ret; |
1731 | ||
1732 | error: | |
1733 | kfree(ret); | |
1734 | return ERR_PTR(err); | |
1735 | } | |
1736 | EXPORT_SYMBOL(p9_client_getattr_dotl); | |
1737 | ||
342fee1d | 1738 | static int p9_client_statsize(struct p9_wstat *wst, int proto_version) |
453ed90d LI |
1739 | { |
1740 | int ret; | |
1741 | ||
9d6939da | 1742 | /* NOTE: size shouldn't include its own length */ |
453ed90d LI |
1743 | /* size[2] type[2] dev[4] qid[13] */ |
1744 | /* mode[4] atime[4] mtime[4] length[8]*/ | |
1745 | /* name[s] uid[s] gid[s] muid[s] */ | |
6e195b0f | 1746 | ret = 2 + 4 + 13 + 4 + 4 + 4 + 8 + 2 + 2 + 2 + 2; |
453ed90d LI |
1747 | |
1748 | if (wst->name) | |
1749 | ret += strlen(wst->name); | |
1750 | if (wst->uid) | |
1751 | ret += strlen(wst->uid); | |
1752 | if (wst->gid) | |
1753 | ret += strlen(wst->gid); | |
1754 | if (wst->muid) | |
1755 | ret += strlen(wst->muid); | |
1756 | ||
6e195b0f DM |
1757 | if (proto_version == p9_proto_2000u || |
1758 | proto_version == p9_proto_2000L) { | |
1759 | /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ | |
1760 | ret += 2 + 4 + 4 + 4; | |
453ed90d LI |
1761 | if (wst->extension) |
1762 | ret += strlen(wst->extension); | |
1763 | } | |
1764 | ||
1765 | return ret; | |
1766 | } | |
1767 | ||
bd238fb4 LI |
1768 | int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) |
1769 | { | |
1770 | int err; | |
51a87c55 | 1771 | struct p9_req_t *req; |
bd238fb4 LI |
1772 | struct p9_client *clnt; |
1773 | ||
453ed90d LI |
1774 | err = 0; |
1775 | clnt = fid->clnt; | |
342fee1d | 1776 | wst->size = p9_client_statsize(wst, clnt->proto_version); |
6e195b0f DM |
1777 | p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", |
1778 | fid->fid); | |
5d385153 | 1779 | p9_debug(P9_DEBUG_9P, |
6e195b0f DM |
1780 | " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" |
1781 | " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" | |
1782 | " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" | |
1783 | " uid=%d gid=%d n_muid=%d\n", | |
1784 | wst->size, wst->type, wst->dev, wst->qid.type, | |
1785 | wst->qid.path, wst->qid.version, | |
1786 | wst->mode, wst->atime, wst->mtime, wst->length, | |
1787 | wst->name, wst->uid, wst->gid, wst->muid, wst->extension, | |
1788 | from_kuid(&init_user_ns, wst->n_uid), | |
1789 | from_kgid(&init_user_ns, wst->n_gid), | |
1790 | from_kuid(&init_user_ns, wst->n_muid)); | |
1791 | ||
1792 | req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", | |
1793 | fid->fid, wst->size + 2, wst); | |
51a87c55 EVH |
1794 | if (IS_ERR(req)) { |
1795 | err = PTR_ERR(req); | |
1796 | goto error; | |
bd238fb4 LI |
1797 | } |
1798 | ||
5d385153 | 1799 | p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); |
bd238fb4 | 1800 | |
67dd8e44 | 1801 | p9_req_put(clnt, req); |
51a87c55 | 1802 | error: |
bd238fb4 LI |
1803 | return err; |
1804 | } | |
1805 | EXPORT_SYMBOL(p9_client_wstat); | |
bda8e775 | 1806 | |
87d7845a SK |
1807 | int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) |
1808 | { | |
1809 | int err; | |
1810 | struct p9_req_t *req; | |
1811 | struct p9_client *clnt; | |
1812 | ||
1813 | err = 0; | |
1814 | clnt = fid->clnt; | |
5d385153 | 1815 | p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); |
6e195b0f DM |
1816 | p9_debug(P9_DEBUG_9P, " valid=%x mode=%x uid=%d gid=%d size=%lld\n", |
1817 | p9attr->valid, p9attr->mode, | |
1818 | from_kuid(&init_user_ns, p9attr->uid), | |
1819 | from_kgid(&init_user_ns, p9attr->gid), | |
1820 | p9attr->size); | |
1821 | p9_debug(P9_DEBUG_9P, " atime_sec=%lld atime_nsec=%lld\n", | |
1822 | p9attr->atime_sec, p9attr->atime_nsec); | |
1823 | p9_debug(P9_DEBUG_9P, " mtime_sec=%lld mtime_nsec=%lld\n", | |
1824 | p9attr->mtime_sec, p9attr->mtime_nsec); | |
87d7845a SK |
1825 | |
1826 | req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); | |
1827 | ||
1828 | if (IS_ERR(req)) { | |
1829 | err = PTR_ERR(req); | |
1830 | goto error; | |
1831 | } | |
5d385153 | 1832 | p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); |
67dd8e44 | 1833 | p9_req_put(clnt, req); |
87d7845a SK |
1834 | error: |
1835 | return err; | |
1836 | } | |
1837 | EXPORT_SYMBOL(p9_client_setattr); | |
1838 | ||
bda8e775 SK |
1839 | int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) |
1840 | { | |
1841 | int err; | |
1842 | struct p9_req_t *req; | |
1843 | struct p9_client *clnt; | |
1844 | ||
1845 | err = 0; | |
1846 | clnt = fid->clnt; | |
1847 | ||
5d385153 | 1848 | p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); |
bda8e775 SK |
1849 | |
1850 | req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); | |
1851 | if (IS_ERR(req)) { | |
1852 | err = PTR_ERR(req); | |
1853 | goto error; | |
1854 | } | |
1855 | ||
523adb6c DM |
1856 | err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, |
1857 | &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, | |
1858 | &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); | |
bda8e775 | 1859 | if (err) { |
523adb6c | 1860 | trace_9p_protocol_dump(clnt, &req->rc); |
67dd8e44 | 1861 | p9_req_put(clnt, req); |
bda8e775 SK |
1862 | goto error; |
1863 | } | |
1864 | ||
6e195b0f DM |
1865 | p9_debug(P9_DEBUG_9P, |
1866 | "<<< RSTATFS fid %d type 0x%x bsize %u blocks %llu bfree %llu bavail %llu files %llu ffree %llu fsid %llu namelen %u\n", | |
1867 | fid->fid, sb->type, sb->bsize, sb->blocks, sb->bfree, | |
1868 | sb->bavail, sb->files, sb->ffree, sb->fsid, sb->namelen); | |
bda8e775 | 1869 | |
67dd8e44 | 1870 | p9_req_put(clnt, req); |
bda8e775 SK |
1871 | error: |
1872 | return err; | |
1873 | } | |
1874 | EXPORT_SYMBOL(p9_client_statfs); | |
4681dbda | 1875 | |
9e8fb38e AK |
1876 | int p9_client_rename(struct p9_fid *fid, |
1877 | struct p9_fid *newdirfid, const char *name) | |
4681dbda SK |
1878 | { |
1879 | int err; | |
1880 | struct p9_req_t *req; | |
1881 | struct p9_client *clnt; | |
1882 | ||
1883 | err = 0; | |
1884 | clnt = fid->clnt; | |
1885 | ||
5d385153 | 1886 | p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", |
6e195b0f | 1887 | fid->fid, newdirfid->fid, name); |
4681dbda SK |
1888 | |
1889 | req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, | |
6e195b0f | 1890 | newdirfid->fid, name); |
4681dbda SK |
1891 | if (IS_ERR(req)) { |
1892 | err = PTR_ERR(req); | |
1893 | goto error; | |
1894 | } | |
1895 | ||
5d385153 | 1896 | p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); |
4681dbda | 1897 | |
67dd8e44 | 1898 | p9_req_put(clnt, req); |
4681dbda SK |
1899 | error: |
1900 | return err; | |
1901 | } | |
1902 | EXPORT_SYMBOL(p9_client_rename); | |
1903 | ||
9e8fb38e AK |
1904 | int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, |
1905 | struct p9_fid *newdirfid, const char *new_name) | |
1906 | { | |
1907 | int err; | |
1908 | struct p9_req_t *req; | |
1909 | struct p9_client *clnt; | |
1910 | ||
1911 | err = 0; | |
1912 | clnt = olddirfid->clnt; | |
1913 | ||
6e195b0f DM |
1914 | p9_debug(P9_DEBUG_9P, |
1915 | ">>> TRENAMEAT olddirfid %d old name %s newdirfid %d new name %s\n", | |
1916 | olddirfid->fid, old_name, newdirfid->fid, new_name); | |
9e8fb38e AK |
1917 | |
1918 | req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, | |
1919 | old_name, newdirfid->fid, new_name); | |
1920 | if (IS_ERR(req)) { | |
1921 | err = PTR_ERR(req); | |
1922 | goto error; | |
1923 | } | |
1924 | ||
5d385153 | 1925 | p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", |
6e195b0f | 1926 | newdirfid->fid, new_name); |
9e8fb38e | 1927 | |
67dd8e44 | 1928 | p9_req_put(clnt, req); |
9e8fb38e AK |
1929 | error: |
1930 | return err; | |
1931 | } | |
1932 | EXPORT_SYMBOL(p9_client_renameat); | |
1933 | ||
6e195b0f | 1934 | /* An xattrwalk without @attr_name gives the fid for the lisxattr namespace |
0ef63f34 AK |
1935 | */ |
1936 | struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, | |
6e195b0f | 1937 | const char *attr_name, u64 *attr_size) |
0ef63f34 AK |
1938 | { |
1939 | int err; | |
1940 | struct p9_req_t *req; | |
1941 | struct p9_client *clnt; | |
1942 | struct p9_fid *attr_fid; | |
1943 | ||
1944 | err = 0; | |
1945 | clnt = file_fid->clnt; | |
1946 | attr_fid = p9_fid_create(clnt); | |
b5303be2 MW |
1947 | if (!attr_fid) { |
1948 | err = -ENOMEM; | |
0ef63f34 AK |
1949 | goto error; |
1950 | } | |
5d385153 | 1951 | p9_debug(P9_DEBUG_9P, |
6e195b0f DM |
1952 | ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", |
1953 | file_fid->fid, attr_fid->fid, attr_name); | |
0ef63f34 AK |
1954 | |
1955 | req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", | |
6e195b0f | 1956 | file_fid->fid, attr_fid->fid, attr_name); |
0ef63f34 AK |
1957 | if (IS_ERR(req)) { |
1958 | err = PTR_ERR(req); | |
1959 | goto error; | |
1960 | } | |
523adb6c | 1961 | err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size); |
0ef63f34 | 1962 | if (err) { |
523adb6c | 1963 | trace_9p_protocol_dump(clnt, &req->rc); |
67dd8e44 | 1964 | p9_req_put(clnt, req); |
0ef63f34 AK |
1965 | goto clunk_fid; |
1966 | } | |
67dd8e44 | 1967 | p9_req_put(clnt, req); |
5d385153 | 1968 | p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", |
6e195b0f | 1969 | attr_fid->fid, *attr_size); |
0ef63f34 AK |
1970 | return attr_fid; |
1971 | clunk_fid: | |
b48dbb99 | 1972 | p9_fid_put(attr_fid); |
0ef63f34 AK |
1973 | attr_fid = NULL; |
1974 | error: | |
6e195b0f | 1975 | if (attr_fid && attr_fid != file_fid) |
0ef63f34 AK |
1976 | p9_fid_destroy(attr_fid); |
1977 | ||
1978 | return ERR_PTR(err); | |
1979 | } | |
1980 | EXPORT_SYMBOL_GPL(p9_client_xattrwalk); | |
1981 | ||
eda25e46 | 1982 | int p9_client_xattrcreate(struct p9_fid *fid, const char *name, |
6e195b0f | 1983 | u64 attr_size, int flags) |
eda25e46 AK |
1984 | { |
1985 | int err; | |
1986 | struct p9_req_t *req; | |
1987 | struct p9_client *clnt; | |
1988 | ||
5d385153 | 1989 | p9_debug(P9_DEBUG_9P, |
6e195b0f DM |
1990 | ">>> TXATTRCREATE fid %d name %s size %llu flag %d\n", |
1991 | fid->fid, name, attr_size, flags); | |
eda25e46 AK |
1992 | err = 0; |
1993 | clnt = fid->clnt; | |
1994 | req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", | |
6e195b0f | 1995 | fid->fid, name, attr_size, flags); |
eda25e46 AK |
1996 | if (IS_ERR(req)) { |
1997 | err = PTR_ERR(req); | |
1998 | goto error; | |
1999 | } | |
5d385153 | 2000 | p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); |
67dd8e44 | 2001 | p9_req_put(clnt, req); |
eda25e46 AK |
2002 | error: |
2003 | return err; | |
2004 | } | |
2005 | EXPORT_SYMBOL_GPL(p9_client_xattrcreate); | |
2006 | ||
7751bdb3 SK |
2007 | int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) |
2008 | { | |
abfa034e | 2009 | int err, rsize, non_zc = 0; |
7751bdb3 SK |
2010 | struct p9_client *clnt; |
2011 | struct p9_req_t *req; | |
2012 | char *dataptr; | |
4f3b35c1 AV |
2013 | struct kvec kv = {.iov_base = data, .iov_len = count}; |
2014 | struct iov_iter to; | |
2015 | ||
aa563d7b | 2016 | iov_iter_kvec(&to, READ, &kv, 1, count); |
7751bdb3 | 2017 | |
5d385153 | 2018 | p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", |
6e195b0f | 2019 | fid->fid, offset, count); |
7751bdb3 SK |
2020 | |
2021 | err = 0; | |
2022 | clnt = fid->clnt; | |
7751bdb3 SK |
2023 | |
2024 | rsize = fid->iounit; | |
6e195b0f | 2025 | if (!rsize || rsize > clnt->msize - P9_READDIRHDRSZ) |
7751bdb3 SK |
2026 | rsize = clnt->msize - P9_READDIRHDRSZ; |
2027 | ||
2028 | if (count < rsize) | |
2029 | rsize = count; | |
2030 | ||
abfa034e AK |
2031 | /* Don't bother zerocopy for small IO (< 1024) */ |
2032 | if (clnt->trans_mod->zc_request && rsize > 1024) { | |
6e195b0f | 2033 | /* response header len is 11 |
abfa034e AK |
2034 | * PDU Header(7) + IO Size (4) |
2035 | */ | |
4f3b35c1 AV |
2036 | req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, |
2037 | 11, "dqd", fid->fid, offset, rsize); | |
2c66523f | 2038 | } else { |
abfa034e | 2039 | non_zc = 1; |
2c66523f | 2040 | req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, |
abfa034e | 2041 | offset, rsize); |
2c66523f | 2042 | } |
7751bdb3 SK |
2043 | if (IS_ERR(req)) { |
2044 | err = PTR_ERR(req); | |
2045 | goto error; | |
2046 | } | |
2047 | ||
523adb6c | 2048 | err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr); |
7751bdb3 | 2049 | if (err) { |
523adb6c | 2050 | trace_9p_protocol_dump(clnt, &req->rc); |
7751bdb3 SK |
2051 | goto free_and_error; |
2052 | } | |
71d6ad08 AV |
2053 | if (rsize < count) { |
2054 | pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); | |
2055 | count = rsize; | |
2056 | } | |
7751bdb3 | 2057 | |
5d385153 | 2058 | p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); |
7751bdb3 | 2059 | |
abfa034e | 2060 | if (non_zc) |
7751bdb3 SK |
2061 | memmove(data, dataptr, count); |
2062 | ||
67dd8e44 | 2063 | p9_req_put(clnt, req); |
7751bdb3 SK |
2064 | return count; |
2065 | ||
2066 | free_and_error: | |
67dd8e44 | 2067 | p9_req_put(clnt, req); |
7751bdb3 SK |
2068 | error: |
2069 | return err; | |
2070 | } | |
2071 | EXPORT_SYMBOL(p9_client_readdir); | |
4b43516a | 2072 | |
7880b43b | 2073 | int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, |
6e195b0f | 2074 | dev_t rdev, kgid_t gid, struct p9_qid *qid) |
4b43516a MK |
2075 | { |
2076 | int err; | |
2077 | struct p9_client *clnt; | |
2078 | struct p9_req_t *req; | |
2079 | ||
2080 | err = 0; | |
2081 | clnt = fid->clnt; | |
6e195b0f DM |
2082 | p9_debug(P9_DEBUG_9P, |
2083 | ">>> TMKNOD fid %d name %s mode %d major %d minor %d\n", | |
2084 | fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); | |
f791f7c5 | 2085 | req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, |
6e195b0f | 2086 | MAJOR(rdev), MINOR(rdev), gid); |
4b43516a MK |
2087 | if (IS_ERR(req)) |
2088 | return PTR_ERR(req); | |
2089 | ||
523adb6c | 2090 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); |
4b43516a | 2091 | if (err) { |
523adb6c | 2092 | trace_9p_protocol_dump(clnt, &req->rc); |
4b43516a MK |
2093 | goto error; |
2094 | } | |
6e195b0f DM |
2095 | p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", |
2096 | qid->type, qid->path, qid->version); | |
4b43516a MK |
2097 | |
2098 | error: | |
67dd8e44 | 2099 | p9_req_put(clnt, req); |
4b43516a | 2100 | return err; |
4b43516a MK |
2101 | } |
2102 | EXPORT_SYMBOL(p9_client_mknod_dotl); | |
01a622bd | 2103 | |
7880b43b | 2104 | int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, |
6e195b0f | 2105 | kgid_t gid, struct p9_qid *qid) |
01a622bd MK |
2106 | { |
2107 | int err; | |
2108 | struct p9_client *clnt; | |
2109 | struct p9_req_t *req; | |
2110 | ||
2111 | err = 0; | |
2112 | clnt = fid->clnt; | |
5d385153 | 2113 | p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", |
f791f7c5 | 2114 | fid->fid, name, mode, from_kgid(&init_user_ns, gid)); |
6e195b0f DM |
2115 | req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", |
2116 | fid->fid, name, mode, gid); | |
01a622bd MK |
2117 | if (IS_ERR(req)) |
2118 | return PTR_ERR(req); | |
2119 | ||
523adb6c | 2120 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); |
01a622bd | 2121 | if (err) { |
523adb6c | 2122 | trace_9p_protocol_dump(clnt, &req->rc); |
01a622bd MK |
2123 | goto error; |
2124 | } | |
5d385153 | 2125 | p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, |
6e195b0f | 2126 | qid->path, qid->version); |
01a622bd MK |
2127 | |
2128 | error: | |
67dd8e44 | 2129 | p9_req_put(clnt, req); |
01a622bd | 2130 | return err; |
01a622bd MK |
2131 | } |
2132 | EXPORT_SYMBOL(p9_client_mkdir_dotl); | |
a099027c MK |
2133 | |
2134 | int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) | |
2135 | { | |
2136 | int err; | |
2137 | struct p9_client *clnt; | |
2138 | struct p9_req_t *req; | |
2139 | ||
2140 | err = 0; | |
2141 | clnt = fid->clnt; | |
6e195b0f DM |
2142 | p9_debug(P9_DEBUG_9P, |
2143 | ">>> TLOCK fid %d type %i flags %d start %lld length %lld proc_id %d client_id %s\n", | |
2144 | fid->fid, flock->type, flock->flags, flock->start, | |
2145 | flock->length, flock->proc_id, flock->client_id); | |
a099027c MK |
2146 | |
2147 | req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, | |
6e195b0f DM |
2148 | flock->flags, flock->start, flock->length, |
2149 | flock->proc_id, flock->client_id); | |
a099027c MK |
2150 | |
2151 | if (IS_ERR(req)) | |
2152 | return PTR_ERR(req); | |
2153 | ||
523adb6c | 2154 | err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status); |
a099027c | 2155 | if (err) { |
523adb6c | 2156 | trace_9p_protocol_dump(clnt, &req->rc); |
a099027c MK |
2157 | goto error; |
2158 | } | |
5d385153 | 2159 | p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); |
a099027c | 2160 | error: |
67dd8e44 | 2161 | p9_req_put(clnt, req); |
a099027c | 2162 | return err; |
a099027c MK |
2163 | } |
2164 | EXPORT_SYMBOL(p9_client_lock_dotl); | |
1d769cd1 MK |
2165 | |
2166 | int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) | |
2167 | { | |
2168 | int err; | |
2169 | struct p9_client *clnt; | |
2170 | struct p9_req_t *req; | |
2171 | ||
2172 | err = 0; | |
2173 | clnt = fid->clnt; | |
6e195b0f DM |
2174 | p9_debug(P9_DEBUG_9P, |
2175 | ">>> TGETLOCK fid %d, type %i start %lld length %lld proc_id %d client_id %s\n", | |
2176 | fid->fid, glock->type, glock->start, glock->length, | |
2177 | glock->proc_id, glock->client_id); | |
1d769cd1 | 2178 | |
6e195b0f DM |
2179 | req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, |
2180 | glock->type, glock->start, glock->length, | |
2181 | glock->proc_id, glock->client_id); | |
1d769cd1 MK |
2182 | |
2183 | if (IS_ERR(req)) | |
2184 | return PTR_ERR(req); | |
2185 | ||
523adb6c DM |
2186 | err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type, |
2187 | &glock->start, &glock->length, &glock->proc_id, | |
2188 | &glock->client_id); | |
1d769cd1 | 2189 | if (err) { |
523adb6c | 2190 | trace_9p_protocol_dump(clnt, &req->rc); |
1d769cd1 MK |
2191 | goto error; |
2192 | } | |
6e195b0f DM |
2193 | p9_debug(P9_DEBUG_9P, |
2194 | "<<< RGETLOCK type %i start %lld length %lld proc_id %d client_id %s\n", | |
2195 | glock->type, glock->start, glock->length, | |
2196 | glock->proc_id, glock->client_id); | |
1d769cd1 | 2197 | error: |
67dd8e44 | 2198 | p9_req_put(clnt, req); |
1d769cd1 MK |
2199 | return err; |
2200 | } | |
2201 | EXPORT_SYMBOL(p9_client_getlock_dotl); | |
329176cc MK |
2202 | |
2203 | int p9_client_readlink(struct p9_fid *fid, char **target) | |
2204 | { | |
2205 | int err; | |
2206 | struct p9_client *clnt; | |
2207 | struct p9_req_t *req; | |
2208 | ||
2209 | err = 0; | |
2210 | clnt = fid->clnt; | |
5d385153 | 2211 | p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); |
329176cc MK |
2212 | |
2213 | req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); | |
2214 | if (IS_ERR(req)) | |
2215 | return PTR_ERR(req); | |
2216 | ||
523adb6c | 2217 | err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target); |
329176cc | 2218 | if (err) { |
523adb6c | 2219 | trace_9p_protocol_dump(clnt, &req->rc); |
329176cc MK |
2220 | goto error; |
2221 | } | |
5d385153 | 2222 | p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); |
329176cc | 2223 | error: |
67dd8e44 | 2224 | p9_req_put(clnt, req); |
329176cc MK |
2225 | return err; |
2226 | } | |
2227 | EXPORT_SYMBOL(p9_client_readlink); | |
996d5b4d MW |
2228 | |
2229 | int __init p9_client_init(void) | |
2230 | { | |
728356de | 2231 | p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); |
996d5b4d MW |
2232 | return p9_req_cache ? 0 : -ENOMEM; |
2233 | } | |
2234 | ||
2235 | void __exit p9_client_exit(void) | |
2236 | { | |
2237 | kmem_cache_destroy(p9_req_cache); | |
2238 | } |