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 | |
301 | * in the recv thread, and one ref put by p9_tag_remove in the | |
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 | */ | |
308 | refcount_set(&req->refcount.refcount, 2); | |
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) { | |
344 | p9_req_put(req); | |
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 | */ |
728356de | 361 | static int 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 | |
996d5b4d MW |
366 | p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag); |
367 | spin_lock_irqsave(&c->lock, flags); | |
368 | idr_remove(&c->reqs, tag); | |
369 | spin_unlock_irqrestore(&c->lock, flags); | |
728356de TB |
370 | return p9_req_put(r); |
371 | } | |
372 | ||
373 | static void p9_req_free(struct kref *ref) | |
374 | { | |
375 | struct p9_req_t *r = container_of(ref, struct p9_req_t, refcount); | |
6e195b0f | 376 | |
523adb6c DM |
377 | p9_fcall_fini(&r->tc); |
378 | p9_fcall_fini(&r->rc); | |
996d5b4d | 379 | kmem_cache_free(p9_req_cache, r); |
fea511a6 EVH |
380 | } |
381 | ||
728356de TB |
382 | int p9_req_put(struct p9_req_t *r) |
383 | { | |
384 | return kref_put(&r->refcount, p9_req_free); | |
385 | } | |
386 | EXPORT_SYMBOL(p9_req_put); | |
387 | ||
fea511a6 EVH |
388 | /** |
389 | * p9_tag_cleanup - cleans up tags structure and reclaims resources | |
0e15597e | 390 | * @c: v9fs client struct |
fea511a6 EVH |
391 | * |
392 | * This frees resources associated with the tags structure | |
393 | * | |
394 | */ | |
395 | static void p9_tag_cleanup(struct p9_client *c) | |
396 | { | |
996d5b4d MW |
397 | struct p9_req_t *req; |
398 | int id; | |
fea511a6 | 399 | |
996d5b4d MW |
400 | rcu_read_lock(); |
401 | idr_for_each_entry(&c->reqs, req, id) { | |
402 | pr_info("Tag %d still in use\n", id); | |
728356de TB |
403 | if (p9_tag_remove(c, req) == 0) |
404 | pr_warn("Packet with tag %d has still references", | |
405 | req->tc.tag); | |
fea511a6 | 406 | } |
996d5b4d | 407 | rcu_read_unlock(); |
673d62cd EVH |
408 | } |
409 | ||
91b8534f EVH |
410 | /** |
411 | * p9_client_cb - call back from transport to client | |
760b3d61 AL |
412 | * @c: client state |
413 | * @req: request received | |
414 | * @status: request status, one of REQ_STATUS_* | |
91b8534f EVH |
415 | * |
416 | */ | |
2b6e72ed | 417 | void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) |
91b8534f | 418 | { |
523adb6c | 419 | p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag); |
2b6e72ed | 420 | |
6e195b0f | 421 | /* This barrier is needed to make sure any change made to req before |
2d58f63f | 422 | * the status change is visible to another thread |
2b6e72ed DM |
423 | */ |
424 | smp_wmb(); | |
425 | req->status = status; | |
426 | ||
2557d0c5 | 427 | wake_up(&req->wq); |
523adb6c | 428 | p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag); |
728356de | 429 | p9_req_put(req); |
91b8534f EVH |
430 | } |
431 | EXPORT_SYMBOL(p9_client_cb); | |
432 | ||
51a87c55 EVH |
433 | /** |
434 | * p9_parse_header - parse header arguments out of a packet | |
435 | * @pdu: packet to parse | |
436 | * @size: size of packet | |
437 | * @type: type of request | |
438 | * @tag: tag of packet | |
439 | * @rewind: set if we need to rewind offset afterwards | |
440 | */ | |
441 | ||
442 | int | |
6e195b0f DM |
443 | p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, |
444 | int16_t *tag, int rewind) | |
51a87c55 | 445 | { |
6e195b0f DM |
446 | s8 r_type; |
447 | s16 r_tag; | |
448 | s32 r_size; | |
51a87c55 EVH |
449 | int offset = pdu->offset; |
450 | int err; | |
451 | ||
452 | pdu->offset = 0; | |
51a87c55 EVH |
453 | |
454 | err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); | |
455 | if (err) | |
456 | goto rewind_and_exit; | |
457 | ||
51a87c55 EVH |
458 | if (type) |
459 | *type = r_type; | |
460 | if (tag) | |
461 | *tag = r_tag; | |
462 | if (size) | |
463 | *size = r_size; | |
464 | ||
f984579a TB |
465 | if (pdu->size != r_size || r_size < 7) { |
466 | err = -EINVAL; | |
467 | goto rewind_and_exit; | |
468 | } | |
469 | ||
470 | pdu->id = r_type; | |
471 | pdu->tag = r_tag; | |
472 | ||
473 | p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", | |
474 | pdu->size, pdu->id, pdu->tag); | |
51a87c55 EVH |
475 | |
476 | rewind_and_exit: | |
477 | if (rewind) | |
478 | pdu->offset = offset; | |
479 | return err; | |
480 | } | |
481 | EXPORT_SYMBOL(p9_parse_header); | |
482 | ||
483 | /** | |
484 | * p9_check_errors - check 9p packet for error return and process it | |
485 | * @c: current client instance | |
486 | * @req: request to parse and check for error conditions | |
487 | * | |
488 | * returns error code if one is discovered, otherwise returns 0 | |
489 | * | |
490 | * this will have to be more complicated if we have multiple | |
491 | * error packet types | |
492 | */ | |
493 | ||
494 | static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) | |
495 | { | |
6e195b0f | 496 | s8 type; |
51a87c55 | 497 | int err; |
ca41bb3e | 498 | int ecode; |
51a87c55 | 499 | |
523adb6c DM |
500 | err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); |
501 | if (req->rc.size >= c->msize) { | |
f984579a TB |
502 | p9_debug(P9_DEBUG_ERROR, |
503 | "requested packet size too big: %d\n", | |
523adb6c | 504 | req->rc.size); |
f984579a TB |
505 | return -EIO; |
506 | } | |
6e195b0f | 507 | /* dump the response from server |
348b5901 AK |
508 | * This should be after check errors which poplulate pdu_fcall. |
509 | */ | |
523adb6c | 510 | trace_9p_protocol_dump(c, &req->rc); |
51a87c55 | 511 | if (err) { |
5d385153 | 512 | p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); |
51a87c55 EVH |
513 | return err; |
514 | } | |
ca41bb3e VJJ |
515 | if (type != P9_RERROR && type != P9_RLERROR) |
516 | return 0; | |
4f7ebe80 | 517 | |
ca41bb3e VJJ |
518 | if (!p9_is_proto_dotl(c)) { |
519 | char *ename; | |
6e195b0f | 520 | |
523adb6c | 521 | err = p9pdu_readf(&req->rc, c->proto_version, "s?d", |
abfa034e | 522 | &ename, &ecode); |
ca41bb3e VJJ |
523 | if (err) |
524 | goto out_err; | |
4f7ebe80 | 525 | |
287980e4 | 526 | if (p9_is_proto_dotu(c) && ecode < 512) |
ca41bb3e | 527 | err = -ecode; |
4f7ebe80 | 528 | |
287980e4 | 529 | if (!err) { |
ca41bb3e | 530 | err = p9_errstr2errno(ename, strlen(ename)); |
4f7ebe80 | 531 | |
5d385153 JP |
532 | p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", |
533 | -ecode, ename); | |
4f7ebe80 | 534 | } |
abfa034e | 535 | kfree(ename); |
ca41bb3e | 536 | } else { |
523adb6c | 537 | err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); |
27eb4c31 DM |
538 | if (err) |
539 | goto out_err; | |
ca41bb3e VJJ |
540 | err = -ecode; |
541 | ||
5d385153 | 542 | p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); |
ca41bb3e | 543 | } |
51a87c55 | 544 | |
51a87c55 | 545 | return err; |
4f7ebe80 AB |
546 | |
547 | out_err: | |
5d385153 | 548 | p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); |
4f7ebe80 AB |
549 | |
550 | return err; | |
51a87c55 EVH |
551 | } |
552 | ||
abfa034e AK |
553 | /** |
554 | * p9_check_zc_errors - check 9p packet for error return and process it | |
555 | * @c: current client instance | |
556 | * @req: request to parse and check for error conditions | |
760b3d61 | 557 | * @uidata: external buffer containing error |
abfa034e AK |
558 | * @in_hdrlen: Size of response protocol buffer. |
559 | * | |
560 | * returns error code if one is discovered, otherwise returns 0 | |
561 | * | |
562 | * this will have to be more complicated if we have multiple | |
563 | * error packet types | |
564 | */ | |
565 | ||
566 | static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req, | |
4f3b35c1 | 567 | struct iov_iter *uidata, int in_hdrlen) |
abfa034e AK |
568 | { |
569 | int err; | |
570 | int ecode; | |
6e195b0f | 571 | s8 type; |
abfa034e AK |
572 | char *ename = NULL; |
573 | ||
523adb6c | 574 | err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); |
6e195b0f | 575 | /* dump the response from server |
348b5901 AK |
576 | * This should be after parse_header which poplulate pdu_fcall. |
577 | */ | |
523adb6c | 578 | trace_9p_protocol_dump(c, &req->rc); |
abfa034e | 579 | if (err) { |
5d385153 | 580 | p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); |
abfa034e AK |
581 | return err; |
582 | } | |
583 | ||
584 | if (type != P9_RERROR && type != P9_RLERROR) | |
585 | return 0; | |
586 | ||
587 | if (!p9_is_proto_dotl(c)) { | |
588 | /* Error is reported in string format */ | |
42fe6484 AK |
589 | int len; |
590 | /* 7 = header size for RERROR; */ | |
591 | int inline_len = in_hdrlen - 7; | |
abfa034e | 592 | |
523adb6c | 593 | len = req->rc.size - req->rc.offset; |
42fe6484 AK |
594 | if (len > (P9_ZC_HDR_SZ - 7)) { |
595 | err = -EFAULT; | |
abfa034e AK |
596 | goto out_err; |
597 | } | |
abfa034e | 598 | |
523adb6c | 599 | ename = &req->rc.sdata[req->rc.offset]; |
42fe6484 AK |
600 | if (len > inline_len) { |
601 | /* We have error in external buffer */ | |
1c512a7c | 602 | if (!copy_from_iter_full(ename + inline_len, |
6e195b0f | 603 | len - inline_len, uidata)) { |
4f3b35c1 AV |
604 | err = -EFAULT; |
605 | goto out_err; | |
abfa034e AK |
606 | } |
607 | } | |
42fe6484 | 608 | ename = NULL; |
523adb6c | 609 | err = p9pdu_readf(&req->rc, c->proto_version, "s?d", |
42fe6484 AK |
610 | &ename, &ecode); |
611 | if (err) | |
612 | goto out_err; | |
613 | ||
287980e4 | 614 | if (p9_is_proto_dotu(c) && ecode < 512) |
abfa034e | 615 | err = -ecode; |
42fe6484 | 616 | |
287980e4 | 617 | if (!err) { |
abfa034e AK |
618 | err = p9_errstr2errno(ename, strlen(ename)); |
619 | ||
5d385153 JP |
620 | p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", |
621 | -ecode, ename); | |
abfa034e AK |
622 | } |
623 | kfree(ename); | |
624 | } else { | |
523adb6c | 625 | err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); |
abfa034e AK |
626 | err = -ecode; |
627 | ||
5d385153 | 628 | p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); |
abfa034e AK |
629 | } |
630 | return err; | |
631 | ||
abfa034e | 632 | out_err: |
5d385153 | 633 | p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); |
abfa034e AK |
634 | return err; |
635 | } | |
636 | ||
aca00763 RL |
637 | static struct p9_req_t * |
638 | p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); | |
639 | ||
51a87c55 EVH |
640 | /** |
641 | * p9_client_flush - flush (cancel) a request | |
0e15597e AK |
642 | * @c: client state |
643 | * @oldreq: request to cancel | |
51a87c55 | 644 | * |
aca00763 | 645 | * This sents a flush for a particular request and links |
51a87c55 EVH |
646 | * the flush request to the original request. The current |
647 | * code only supports a single flush request although the protocol | |
648 | * allows for multiple flush requests to be sent for a single request. | |
649 | * | |
650 | */ | |
651 | ||
652 | static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) | |
653 | { | |
654 | struct p9_req_t *req; | |
6e195b0f | 655 | s16 oldtag; |
51a87c55 EVH |
656 | int err; |
657 | ||
523adb6c | 658 | err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1); |
51a87c55 EVH |
659 | if (err) |
660 | return err; | |
661 | ||
5d385153 | 662 | p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); |
51a87c55 EVH |
663 | |
664 | req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); | |
665 | if (IS_ERR(req)) | |
666 | return PTR_ERR(req); | |
667 | ||
6e195b0f | 668 | /* if we haven't received a response for oldreq, |
60ff779c | 669 | * remove it from the list |
1cff3306 | 670 | */ |
728356de | 671 | if (oldreq->status == REQ_STATUS_SENT) { |
afd8d654 SD |
672 | if (c->trans_mod->cancelled) |
673 | c->trans_mod->cancelled(c, oldreq); | |
728356de | 674 | } |
1bab88b2 | 675 | |
43cbcbee | 676 | p9_tag_remove(c, req); |
51a87c55 EVH |
677 | return 0; |
678 | } | |
679 | ||
abfa034e AK |
680 | static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, |
681 | int8_t type, int req_size, | |
682 | const char *fmt, va_list ap) | |
91b8534f | 683 | { |
996d5b4d | 684 | int err; |
91b8534f | 685 | struct p9_req_t *req; |
91b8534f | 686 | |
5d385153 | 687 | p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); |
91b8534f | 688 | |
6d96d3ab AK |
689 | /* we allow for any status other than disconnected */ |
690 | if (c->status == Disconnected) | |
691 | return ERR_PTR(-EIO); | |
692 | ||
693 | /* if status is begin_disconnected we allow only clunk request */ | |
6e195b0f | 694 | if (c->status == BeginDisconnect && type != P9_TCLUNK) |
51a87c55 | 695 | return ERR_PTR(-EIO); |
91b8534f | 696 | |
996d5b4d | 697 | req = p9_tag_alloc(c, type, req_size); |
51a87c55 EVH |
698 | if (IS_ERR(req)) |
699 | return req; | |
91b8534f | 700 | |
51a87c55 | 701 | /* marshall the data */ |
523adb6c DM |
702 | p9pdu_prepare(&req->tc, req->tc.tag, type); |
703 | err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap); | |
7b3bb3fe AK |
704 | if (err) |
705 | goto reterr; | |
523adb6c DM |
706 | p9pdu_finalize(c, &req->tc); |
707 | trace_9p_client_req(c, type, req->tc.tag); | |
abfa034e AK |
708 | return req; |
709 | reterr: | |
43cbcbee | 710 | p9_tag_remove(c, req); |
728356de TB |
711 | /* We have to put also the 2nd reference as it won't be used */ |
712 | p9_req_put(req); | |
abfa034e AK |
713 | return ERR_PTR(err); |
714 | } | |
715 | ||
716 | /** | |
717 | * p9_client_rpc - issue a request and wait for a response | |
718 | * @c: client session | |
719 | * @type: type of request | |
720 | * @fmt: protocol format string (see protocol.c) | |
721 | * | |
43cbcbee | 722 | * Returns request structure (which client must free using p9_tag_remove) |
abfa034e AK |
723 | */ |
724 | ||
725 | static struct p9_req_t * | |
726 | p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) | |
727 | { | |
728 | va_list ap; | |
729 | int sigpending, err; | |
730 | unsigned long flags; | |
731 | struct p9_req_t *req; | |
732 | ||
733 | va_start(ap, fmt); | |
734 | req = p9_client_prepare_req(c, type, c->msize, fmt, ap); | |
735 | va_end(ap); | |
736 | if (IS_ERR(req)) | |
737 | return req; | |
738 | ||
739 | if (signal_pending(current)) { | |
740 | sigpending = 1; | |
741 | clear_thread_flag(TIF_SIGPENDING); | |
6e195b0f | 742 | } else { |
abfa034e | 743 | sigpending = 0; |
6e195b0f | 744 | } |
91b8534f EVH |
745 | |
746 | err = c->trans_mod->request(c, req); | |
747 | if (err < 0) { | |
728356de TB |
748 | /* write won't happen */ |
749 | p9_req_put(req); | |
3cd79678 | 750 | if (err != -ERESTARTSYS && err != -EFAULT) |
52f44e0d | 751 | c->status = Disconnected; |
a8522243 | 752 | goto recalc_sigpending; |
91b8534f | 753 | } |
a314f274 | 754 | again: |
abfa034e | 755 | /* Wait for the response */ |
2557d0c5 | 756 | err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD); |
91b8534f | 757 | |
6e195b0f | 758 | /* Make sure our req is coherent with regard to updates in other |
2b6e72ed DM |
759 | * threads - echoes to wmb() in the callback |
760 | */ | |
761 | smp_rmb(); | |
762 | ||
6e195b0f DM |
763 | if (err == -ERESTARTSYS && c->status == Connected && |
764 | type == P9_TFLUSH) { | |
a314f274 JG |
765 | sigpending = 1; |
766 | clear_thread_flag(TIF_SIGPENDING); | |
767 | goto again; | |
768 | } | |
769 | ||
91b8534f | 770 | if (req->status == REQ_STATUS_ERROR) { |
5d385153 | 771 | p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); |
91b8534f | 772 | err = req->t_err; |
91b8534f | 773 | } |
6e195b0f | 774 | if (err == -ERESTARTSYS && c->status == Connected) { |
5d385153 | 775 | p9_debug(P9_DEBUG_MUX, "flushing\n"); |
91b8534f | 776 | sigpending = 1; |
91b8534f EVH |
777 | clear_thread_flag(TIF_SIGPENDING); |
778 | ||
1bab88b2 LI |
779 | if (c->trans_mod->cancel(c, req)) |
780 | p9_client_flush(c, req); | |
781 | ||
782 | /* if we received the response anyway, don't signal error */ | |
783 | if (req->status == REQ_STATUS_RCVD) | |
784 | err = 0; | |
91b8534f | 785 | } |
a8522243 | 786 | recalc_sigpending: |
91b8534f EVH |
787 | if (sigpending) { |
788 | spin_lock_irqsave(¤t->sighand->siglock, flags); | |
789 | recalc_sigpending(); | |
790 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); | |
791 | } | |
91b8534f EVH |
792 | if (err < 0) |
793 | goto reterr; | |
794 | ||
51a87c55 | 795 | err = p9_check_errors(c, req); |
523adb6c | 796 | trace_9p_client_res(c, type, req->rc.tag, err); |
348b5901 | 797 | if (!err) |
51a87c55 | 798 | return req; |
abfa034e | 799 | reterr: |
43cbcbee | 800 | p9_tag_remove(c, req); |
43def35c | 801 | return ERR_PTR(safe_errno(err)); |
abfa034e AK |
802 | } |
803 | ||
804 | /** | |
805 | * p9_client_zc_rpc - issue a request and wait for a response | |
806 | * @c: client session | |
807 | * @type: type of request | |
4f3b35c1 AV |
808 | * @uidata: destination for zero copy read |
809 | * @uodata: source for zero copy write | |
abfa034e AK |
810 | * @inlen: read buffer size |
811 | * @olen: write buffer size | |
15e522a7 | 812 | * @in_hdrlen: reader header size, This is the size of response protocol data |
abfa034e AK |
813 | * @fmt: protocol format string (see protocol.c) |
814 | * | |
43cbcbee | 815 | * Returns request structure (which client must free using p9_tag_remove) |
abfa034e AK |
816 | */ |
817 | static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, | |
4f3b35c1 AV |
818 | struct iov_iter *uidata, |
819 | struct iov_iter *uodata, | |
abfa034e | 820 | int inlen, int olen, int in_hdrlen, |
4f3b35c1 | 821 | const char *fmt, ...) |
abfa034e AK |
822 | { |
823 | va_list ap; | |
824 | int sigpending, err; | |
825 | unsigned long flags; | |
826 | struct p9_req_t *req; | |
827 | ||
828 | va_start(ap, fmt); | |
6e195b0f | 829 | /* We allocate a inline protocol data of only 4k bytes. |
abfa034e AK |
830 | * The actual content is passed in zero-copy fashion. |
831 | */ | |
832 | req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap); | |
833 | va_end(ap); | |
834 | if (IS_ERR(req)) | |
835 | return req; | |
836 | ||
837 | if (signal_pending(current)) { | |
838 | sigpending = 1; | |
839 | clear_thread_flag(TIF_SIGPENDING); | |
6e195b0f | 840 | } else { |
abfa034e | 841 | sigpending = 0; |
6e195b0f | 842 | } |
abfa034e | 843 | |
abfa034e | 844 | err = c->trans_mod->zc_request(c, req, uidata, uodata, |
4f3b35c1 | 845 | inlen, olen, in_hdrlen); |
abfa034e AK |
846 | if (err < 0) { |
847 | if (err == -EIO) | |
848 | c->status = Disconnected; | |
a84b69cb | 849 | if (err != -ERESTARTSYS) |
a8522243 | 850 | goto recalc_sigpending; |
abfa034e AK |
851 | } |
852 | if (req->status == REQ_STATUS_ERROR) { | |
5d385153 | 853 | p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); |
abfa034e AK |
854 | err = req->t_err; |
855 | } | |
6e195b0f | 856 | if (err == -ERESTARTSYS && c->status == Connected) { |
5d385153 | 857 | p9_debug(P9_DEBUG_MUX, "flushing\n"); |
abfa034e AK |
858 | sigpending = 1; |
859 | clear_thread_flag(TIF_SIGPENDING); | |
91b8534f | 860 | |
abfa034e AK |
861 | if (c->trans_mod->cancel(c, req)) |
862 | p9_client_flush(c, req); | |
863 | ||
864 | /* if we received the response anyway, don't signal error */ | |
865 | if (req->status == REQ_STATUS_RCVD) | |
866 | err = 0; | |
867 | } | |
a8522243 | 868 | recalc_sigpending: |
abfa034e AK |
869 | if (sigpending) { |
870 | spin_lock_irqsave(¤t->sighand->siglock, flags); | |
871 | recalc_sigpending(); | |
872 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); | |
873 | } | |
874 | if (err < 0) | |
875 | goto reterr; | |
876 | ||
4f3b35c1 | 877 | err = p9_check_zc_errors(c, req, uidata, in_hdrlen); |
523adb6c | 878 | trace_9p_client_res(c, type, req->rc.tag, err); |
348b5901 | 879 | if (!err) |
abfa034e | 880 | return req; |
91b8534f | 881 | reterr: |
43cbcbee | 882 | p9_tag_remove(c, req); |
43def35c | 883 | return ERR_PTR(safe_errno(err)); |
91b8534f EVH |
884 | } |
885 | ||
5503ac56 EVH |
886 | static struct p9_fid *p9_fid_create(struct p9_client *clnt) |
887 | { | |
9f3e9bbe | 888 | int ret; |
5503ac56 EVH |
889 | struct p9_fid *fid; |
890 | ||
5d385153 | 891 | p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); |
6e195b0f | 892 | fid = kmalloc(sizeof(*fid), GFP_KERNEL); |
5503ac56 | 893 | if (!fid) |
b5303be2 | 894 | return NULL; |
5503ac56 | 895 | |
6e195b0f | 896 | memset(&fid->qid, 0, sizeof(fid->qid)); |
5503ac56 | 897 | fid->mode = -1; |
f8b9d53a | 898 | fid->uid = current_fsuid(); |
5503ac56 | 899 | fid->clnt = clnt; |
3e2796a9 | 900 | fid->rdir = NULL; |
f28cdf04 | 901 | fid->fid = 0; |
ff5e72eb | 902 | refcount_set(&fid->count, 1); |
5503ac56 | 903 | |
f28cdf04 MW |
904 | idr_preload(GFP_KERNEL); |
905 | spin_lock_irq(&clnt->lock); | |
906 | ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1, | |
907 | GFP_NOWAIT); | |
908 | spin_unlock_irq(&clnt->lock); | |
909 | idr_preload_end(); | |
f28cdf04 MW |
910 | if (!ret) |
911 | return fid; | |
5503ac56 | 912 | |
5503ac56 | 913 | kfree(fid); |
b5303be2 | 914 | return NULL; |
5503ac56 EVH |
915 | } |
916 | ||
917 | static void p9_fid_destroy(struct p9_fid *fid) | |
918 | { | |
919 | struct p9_client *clnt; | |
cac23d65 | 920 | unsigned long flags; |
5503ac56 | 921 | |
5d385153 | 922 | p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); |
5503ac56 | 923 | clnt = fid->clnt; |
cac23d65 | 924 | spin_lock_irqsave(&clnt->lock, flags); |
f28cdf04 | 925 | idr_remove(&clnt->fids, fid->fid); |
cac23d65 | 926 | spin_unlock_irqrestore(&clnt->lock, flags); |
3e2796a9 | 927 | kfree(fid->rdir); |
5503ac56 EVH |
928 | kfree(fid); |
929 | } | |
8a0dc95f | 930 | |
32a875ad | 931 | static int p9_client_version(struct p9_client *c) |
bd238fb4 | 932 | { |
6936bf60 | 933 | int err = 0; |
51a87c55 | 934 | struct p9_req_t *req; |
7913690d | 935 | char *version = NULL; |
51a87c55 | 936 | int msize; |
bd238fb4 | 937 | |
5d385153 JP |
938 | p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", |
939 | c->msize, c->proto_version); | |
c5a7697d SK |
940 | |
941 | switch (c->proto_version) { | |
45bc21ed | 942 | case p9_proto_2000L: |
c5a7697d | 943 | req = p9_client_rpc(c, P9_TVERSION, "ds", |
6e195b0f | 944 | c->msize, "9P2000.L"); |
c5a7697d SK |
945 | break; |
946 | case p9_proto_2000u: | |
947 | req = p9_client_rpc(c, P9_TVERSION, "ds", | |
6e195b0f | 948 | c->msize, "9P2000.u"); |
c5a7697d SK |
949 | break; |
950 | case p9_proto_legacy: | |
951 | req = p9_client_rpc(c, P9_TVERSION, "ds", | |
6e195b0f | 952 | c->msize, "9P2000"); |
c5a7697d SK |
953 | break; |
954 | default: | |
955 | return -EINVAL; | |
c5a7697d SK |
956 | } |
957 | ||
51a87c55 EVH |
958 | if (IS_ERR(req)) |
959 | return PTR_ERR(req); | |
6936bf60 | 960 | |
523adb6c | 961 | err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version); |
51a87c55 | 962 | if (err) { |
5d385153 | 963 | p9_debug(P9_DEBUG_9P, "version error %d\n", err); |
523adb6c | 964 | trace_9p_protocol_dump(c, &req->rc); |
6936bf60 | 965 | goto error; |
51a87c55 | 966 | } |
6936bf60 | 967 | |
5d385153 | 968 | p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); |
6e195b0f | 969 | if (!strncmp(version, "9P2000.L", 8)) { |
45bc21ed | 970 | c->proto_version = p9_proto_2000L; |
6e195b0f | 971 | } else if (!strncmp(version, "9P2000.u", 8)) { |
342fee1d | 972 | c->proto_version = p9_proto_2000u; |
6e195b0f | 973 | } else if (!strncmp(version, "9P2000", 6)) { |
342fee1d | 974 | c->proto_version = p9_proto_legacy; |
6e195b0f | 975 | } else { |
574d356b DM |
976 | p9_debug(P9_DEBUG_ERROR, |
977 | "server returned an unknown version: %s\n", version); | |
6936bf60 EVH |
978 | err = -EREMOTEIO; |
979 | goto error; | |
980 | } | |
981 | ||
574d356b DM |
982 | if (msize < 4096) { |
983 | p9_debug(P9_DEBUG_ERROR, | |
984 | "server returned a msize < 4096: %d\n", msize); | |
985 | err = -EREMOTEIO; | |
986 | goto error; | |
987 | } | |
51a87c55 EVH |
988 | if (msize < c->msize) |
989 | c->msize = msize; | |
6936bf60 EVH |
990 | |
991 | error: | |
51a87c55 | 992 | kfree(version); |
43cbcbee | 993 | p9_tag_remove(c, req); |
6936bf60 EVH |
994 | |
995 | return err; | |
996 | } | |
6936bf60 EVH |
997 | |
998 | struct p9_client *p9_client_create(const char *dev_name, char *options) | |
999 | { | |
1000 | int err; | |
1001 | struct p9_client *clnt; | |
50192abe | 1002 | char *client_id; |
6936bf60 EVH |
1003 | |
1004 | err = 0; | |
6e195b0f | 1005 | clnt = kmalloc(sizeof(*clnt), GFP_KERNEL); |
bd238fb4 LI |
1006 | if (!clnt) |
1007 | return ERR_PTR(-ENOMEM); | |
1008 | ||
72029fe8 | 1009 | clnt->trans_mod = NULL; |
bb8ffdfc | 1010 | clnt->trans = NULL; |
91a76be3 | 1011 | clnt->fcall_cache = NULL; |
50192abe WD |
1012 | |
1013 | client_id = utsname()->nodename; | |
1014 | memcpy(clnt->name, client_id, strlen(client_id) + 1); | |
1015 | ||
bd238fb4 | 1016 | spin_lock_init(&clnt->lock); |
f28cdf04 | 1017 | idr_init(&clnt->fids); |
996d5b4d | 1018 | idr_init(&clnt->reqs); |
fea511a6 | 1019 | |
bb8ffdfc EVH |
1020 | err = parse_opts(options, clnt); |
1021 | if (err < 0) | |
996d5b4d | 1022 | goto free_client; |
bb8ffdfc | 1023 | |
a17d1720 AK |
1024 | if (!clnt->trans_mod) |
1025 | clnt->trans_mod = v9fs_get_default_trans(); | |
1026 | ||
6e195b0f | 1027 | if (!clnt->trans_mod) { |
8a0dc95f | 1028 | err = -EPROTONOSUPPORT; |
5d385153 JP |
1029 | p9_debug(P9_DEBUG_ERROR, |
1030 | "No transport defined or default transport\n"); | |
996d5b4d | 1031 | goto free_client; |
8781ff94 EVH |
1032 | } |
1033 | ||
5d385153 JP |
1034 | p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", |
1035 | clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); | |
8a0dc95f | 1036 | |
8b81ef58 EVH |
1037 | err = clnt->trans_mod->create(clnt, dev_name, options); |
1038 | if (err) | |
f28cdf04 | 1039 | goto put_trans; |
bd238fb4 | 1040 | |
c9ffb05c VJJ |
1041 | if (clnt->msize > clnt->trans_mod->maxsize) |
1042 | clnt->msize = clnt->trans_mod->maxsize; | |
8a0dc95f | 1043 | |
574d356b DM |
1044 | if (clnt->msize < 4096) { |
1045 | p9_debug(P9_DEBUG_ERROR, | |
1046 | "Please specify a msize of at least 4k\n"); | |
1047 | err = -EINVAL; | |
bb06c388 | 1048 | goto close_trans; |
574d356b DM |
1049 | } |
1050 | ||
6936bf60 | 1051 | err = p9_client_version(clnt); |
bd238fb4 | 1052 | if (err) |
8781ff94 | 1053 | goto close_trans; |
bd238fb4 | 1054 | |
91a76be3 DM |
1055 | /* P9_HDRSZ + 4 is the smallest packet header we can have that is |
1056 | * followed by data accessed from userspace by read | |
1057 | */ | |
1058 | clnt->fcall_cache = | |
1059 | kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize, | |
1060 | 0, 0, P9_HDRSZ + 4, | |
1061 | clnt->msize - (P9_HDRSZ + 4), | |
1062 | NULL); | |
1063 | ||
bd238fb4 LI |
1064 | return clnt; |
1065 | ||
8781ff94 EVH |
1066 | close_trans: |
1067 | clnt->trans_mod->close(clnt); | |
8781ff94 EVH |
1068 | put_trans: |
1069 | v9fs_put_trans(clnt->trans_mod); | |
1070 | free_client: | |
1071 | kfree(clnt); | |
bd238fb4 LI |
1072 | return ERR_PTR(err); |
1073 | } | |
1074 | EXPORT_SYMBOL(p9_client_create); | |
1075 | ||
1076 | void p9_client_destroy(struct p9_client *clnt) | |
1077 | { | |
f28cdf04 MW |
1078 | struct p9_fid *fid; |
1079 | int id; | |
bd238fb4 | 1080 | |
5d385153 | 1081 | p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); |
bd238fb4 | 1082 | |
8b81ef58 EVH |
1083 | if (clnt->trans_mod) |
1084 | clnt->trans_mod->close(clnt); | |
bd238fb4 | 1085 | |
72029fe8 TH |
1086 | v9fs_put_trans(clnt->trans_mod); |
1087 | ||
f28cdf04 | 1088 | idr_for_each_entry(&clnt->fids, fid, id) { |
5d385153 | 1089 | pr_info("Found fid %d not clunked\n", fid->fid); |
bd238fb4 | 1090 | p9_fid_destroy(fid); |
6d96d3ab | 1091 | } |
bd238fb4 | 1092 | |
fea511a6 EVH |
1093 | p9_tag_cleanup(clnt); |
1094 | ||
91a76be3 | 1095 | kmem_cache_destroy(clnt->fcall_cache); |
bd238fb4 LI |
1096 | kfree(clnt); |
1097 | } | |
1098 | EXPORT_SYMBOL(p9_client_destroy); | |
1099 | ||
1100 | void p9_client_disconnect(struct p9_client *clnt) | |
1101 | { | |
5d385153 | 1102 | p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); |
8b81ef58 | 1103 | clnt->status = Disconnected; |
bd238fb4 LI |
1104 | } |
1105 | EXPORT_SYMBOL(p9_client_disconnect); | |
1106 | ||
6d96d3ab AK |
1107 | void p9_client_begin_disconnect(struct p9_client *clnt) |
1108 | { | |
5d385153 | 1109 | p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); |
6d96d3ab AK |
1110 | clnt->status = BeginDisconnect; |
1111 | } | |
1112 | EXPORT_SYMBOL(p9_client_begin_disconnect); | |
1113 | ||
bd238fb4 | 1114 | struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, |
6e195b0f DM |
1115 | const char *uname, kuid_t n_uname, |
1116 | const char *aname) | |
bd238fb4 | 1117 | { |
348b5901 | 1118 | int err = 0; |
51a87c55 | 1119 | struct p9_req_t *req; |
bd238fb4 | 1120 | struct p9_fid *fid; |
51a87c55 | 1121 | struct p9_qid qid; |
bd238fb4 | 1122 | |
5d385153 JP |
1123 | p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", |
1124 | afid ? afid->fid : -1, uname, aname); | |
bd238fb4 | 1125 | fid = p9_fid_create(clnt); |
b5303be2 MW |
1126 | if (!fid) { |
1127 | err = -ENOMEM; | |
bd238fb4 LI |
1128 | goto error; |
1129 | } | |
21c9f5cc | 1130 | fid->uid = n_uname; |
bd238fb4 | 1131 | |
f791f7c5 | 1132 | req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, |
6e195b0f | 1133 | afid ? afid->fid : P9_NOFID, uname, aname, n_uname); |
51a87c55 EVH |
1134 | if (IS_ERR(req)) { |
1135 | err = PTR_ERR(req); | |
bd238fb4 LI |
1136 | goto error; |
1137 | } | |
1138 | ||
523adb6c | 1139 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid); |
51a87c55 | 1140 | if (err) { |
523adb6c | 1141 | trace_9p_protocol_dump(clnt, &req->rc); |
43cbcbee | 1142 | p9_tag_remove(clnt, req); |
bd238fb4 | 1143 | goto error; |
51a87c55 | 1144 | } |
bd238fb4 | 1145 | |
5d385153 | 1146 | p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", |
6e195b0f | 1147 | qid.type, qid.path, qid.version); |
51a87c55 EVH |
1148 | |
1149 | memmove(&fid->qid, &qid, sizeof(struct p9_qid)); | |
1150 | ||
43cbcbee | 1151 | p9_tag_remove(clnt, req); |
bd238fb4 LI |
1152 | return fid; |
1153 | ||
1154 | error: | |
bd238fb4 LI |
1155 | if (fid) |
1156 | p9_fid_destroy(fid); | |
1157 | return ERR_PTR(err); | |
1158 | } | |
1159 | EXPORT_SYMBOL(p9_client_attach); | |
1160 | ||
b76225e2 | 1161 | struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, |
6e195b0f | 1162 | const unsigned char * const *wnames, int clone) |
bd238fb4 LI |
1163 | { |
1164 | int err; | |
bd238fb4 LI |
1165 | struct p9_client *clnt; |
1166 | struct p9_fid *fid; | |
51a87c55 EVH |
1167 | struct p9_qid *wqids; |
1168 | struct p9_req_t *req; | |
6e195b0f | 1169 | u16 nwqids, count; |
bd238fb4 | 1170 | |
bd238fb4 | 1171 | err = 0; |
62b2be59 | 1172 | wqids = NULL; |
bd238fb4 LI |
1173 | clnt = oldfid->clnt; |
1174 | if (clone) { | |
1175 | fid = p9_fid_create(clnt); | |
b5303be2 MW |
1176 | if (!fid) { |
1177 | err = -ENOMEM; | |
bd238fb4 LI |
1178 | goto error; |
1179 | } | |
1180 | ||
1181 | fid->uid = oldfid->uid; | |
6e195b0f | 1182 | } else { |
bd238fb4 | 1183 | fid = oldfid; |
6e195b0f | 1184 | } |
51a87c55 | 1185 | |
5d385153 JP |
1186 | p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", |
1187 | oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); | |
51a87c55 | 1188 | req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, |
6e195b0f | 1189 | nwname, wnames); |
51a87c55 EVH |
1190 | if (IS_ERR(req)) { |
1191 | err = PTR_ERR(req); | |
bd238fb4 LI |
1192 | goto error; |
1193 | } | |
1194 | ||
523adb6c | 1195 | err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids); |
e7f4b8f1 | 1196 | if (err) { |
523adb6c | 1197 | trace_9p_protocol_dump(clnt, &req->rc); |
43cbcbee | 1198 | p9_tag_remove(clnt, req); |
51a87c55 | 1199 | goto clunk_fid; |
e7f4b8f1 | 1200 | } |
43cbcbee | 1201 | p9_tag_remove(clnt, req); |
bd238fb4 | 1202 | |
5d385153 | 1203 | p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); |
51a87c55 EVH |
1204 | |
1205 | if (nwqids != nwname) { | |
bd238fb4 LI |
1206 | err = -ENOENT; |
1207 | goto clunk_fid; | |
1208 | } | |
1209 | ||
51a87c55 | 1210 | for (count = 0; count < nwqids; count++) |
5d385153 | 1211 | p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", |
6e195b0f DM |
1212 | count, wqids[count].type, |
1213 | wqids[count].path, | |
1214 | wqids[count].version); | |
51a87c55 | 1215 | |
bd238fb4 | 1216 | if (nwname) |
51a87c55 | 1217 | memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); |
bd238fb4 | 1218 | else |
154372e6 | 1219 | memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid)); |
bd238fb4 | 1220 | |
62b2be59 | 1221 | kfree(wqids); |
bd238fb4 LI |
1222 | return fid; |
1223 | ||
1224 | clunk_fid: | |
62b2be59 | 1225 | kfree(wqids); |
51a87c55 EVH |
1226 | p9_client_clunk(fid); |
1227 | fid = NULL; | |
bd238fb4 LI |
1228 | |
1229 | error: | |
6e195b0f | 1230 | if (fid && fid != oldfid) |
bd238fb4 LI |
1231 | p9_fid_destroy(fid); |
1232 | ||
1233 | return ERR_PTR(err); | |
1234 | } | |
1235 | EXPORT_SYMBOL(p9_client_walk); | |
1236 | ||
1237 | int p9_client_open(struct p9_fid *fid, int mode) | |
1238 | { | |
1239 | int err; | |
bd238fb4 | 1240 | struct p9_client *clnt; |
51a87c55 EVH |
1241 | struct p9_req_t *req; |
1242 | struct p9_qid qid; | |
1243 | int iounit; | |
bd238fb4 | 1244 | |
bd238fb4 | 1245 | clnt = fid->clnt; |
5d385153 | 1246 | p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", |
6e195b0f | 1247 | p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); |
ef56547e | 1248 | err = 0; |
bd238fb4 LI |
1249 | |
1250 | if (fid->mode != -1) | |
1251 | return -EINVAL; | |
1252 | ||
ef56547e MK |
1253 | if (p9_is_proto_dotl(clnt)) |
1254 | req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); | |
1255 | else | |
1256 | req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); | |
51a87c55 EVH |
1257 | if (IS_ERR(req)) { |
1258 | err = PTR_ERR(req); | |
1259 | goto error; | |
bd238fb4 LI |
1260 | } |
1261 | ||
523adb6c | 1262 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); |
e7f4b8f1 | 1263 | if (err) { |
523adb6c | 1264 | trace_9p_protocol_dump(clnt, &req->rc); |
e7f4b8f1 EVH |
1265 | goto free_and_error; |
1266 | } | |
51a87c55 | 1267 | |
5d385153 | 1268 | p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", |
6e195b0f DM |
1269 | p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, |
1270 | qid.path, qid.version, iounit); | |
bd238fb4 | 1271 | |
154372e6 | 1272 | memmove(&fid->qid, &qid, sizeof(struct p9_qid)); |
bd238fb4 | 1273 | fid->mode = mode; |
51a87c55 | 1274 | fid->iounit = iounit; |
bd238fb4 | 1275 | |
e7f4b8f1 | 1276 | free_and_error: |
43cbcbee | 1277 | p9_tag_remove(clnt, req); |
51a87c55 | 1278 | error: |
bd238fb4 LI |
1279 | return err; |
1280 | } | |
1281 | EXPORT_SYMBOL(p9_client_open); | |
1282 | ||
6e195b0f DM |
1283 | int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, |
1284 | u32 mode, kgid_t gid, struct p9_qid *qid) | |
5643135a VJJ |
1285 | { |
1286 | int err = 0; | |
1287 | struct p9_client *clnt; | |
1288 | struct p9_req_t *req; | |
1289 | int iounit; | |
1290 | ||
5d385153 | 1291 | p9_debug(P9_DEBUG_9P, |
6e195b0f DM |
1292 | ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", |
1293 | ofid->fid, name, flags, mode, | |
1294 | from_kgid(&init_user_ns, gid)); | |
5643135a VJJ |
1295 | clnt = ofid->clnt; |
1296 | ||
1297 | if (ofid->mode != -1) | |
1298 | return -EINVAL; | |
1299 | ||
f791f7c5 | 1300 | req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, |
6e195b0f | 1301 | mode, gid); |
5643135a VJJ |
1302 | if (IS_ERR(req)) { |
1303 | err = PTR_ERR(req); | |
1304 | goto error; | |
1305 | } | |
1306 | ||
523adb6c | 1307 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit); |
5643135a | 1308 | if (err) { |
523adb6c | 1309 | trace_9p_protocol_dump(clnt, &req->rc); |
5643135a VJJ |
1310 | goto free_and_error; |
1311 | } | |
1312 | ||
5d385153 | 1313 | p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", |
6e195b0f | 1314 | qid->type, qid->path, qid->version, iounit); |
5643135a | 1315 | |
154372e6 | 1316 | memmove(&ofid->qid, qid, sizeof(struct p9_qid)); |
5643135a VJJ |
1317 | ofid->mode = mode; |
1318 | ofid->iounit = iounit; | |
1319 | ||
1320 | free_and_error: | |
43cbcbee | 1321 | p9_tag_remove(clnt, req); |
5643135a VJJ |
1322 | error: |
1323 | return err; | |
1324 | } | |
1325 | EXPORT_SYMBOL(p9_client_create_dotl); | |
1326 | ||
7880b43b | 1327 | int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, |
bd238fb4 LI |
1328 | char *extension) |
1329 | { | |
1330 | int err; | |
bd238fb4 | 1331 | struct p9_client *clnt; |
51a87c55 EVH |
1332 | struct p9_req_t *req; |
1333 | struct p9_qid qid; | |
1334 | int iounit; | |
bd238fb4 | 1335 | |
5d385153 | 1336 | p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", |
6e195b0f | 1337 | fid->fid, name, perm, mode); |
bd238fb4 | 1338 | err = 0; |
bd238fb4 LI |
1339 | clnt = fid->clnt; |
1340 | ||
1341 | if (fid->mode != -1) | |
1342 | return -EINVAL; | |
1343 | ||
51a87c55 | 1344 | req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, |
6e195b0f | 1345 | mode, extension); |
51a87c55 EVH |
1346 | if (IS_ERR(req)) { |
1347 | err = PTR_ERR(req); | |
1348 | goto error; | |
bd238fb4 LI |
1349 | } |
1350 | ||
523adb6c | 1351 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); |
e7f4b8f1 | 1352 | if (err) { |
523adb6c | 1353 | trace_9p_protocol_dump(clnt, &req->rc); |
e7f4b8f1 EVH |
1354 | goto free_and_error; |
1355 | } | |
51a87c55 | 1356 | |
5d385153 | 1357 | p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", |
6e195b0f | 1358 | qid.type, qid.path, qid.version, iounit); |
bd238fb4 | 1359 | |
154372e6 | 1360 | memmove(&fid->qid, &qid, sizeof(struct p9_qid)); |
bd238fb4 | 1361 | fid->mode = mode; |
51a87c55 | 1362 | fid->iounit = iounit; |
bd238fb4 | 1363 | |
e7f4b8f1 | 1364 | free_and_error: |
43cbcbee | 1365 | p9_tag_remove(clnt, req); |
51a87c55 | 1366 | error: |
bd238fb4 LI |
1367 | return err; |
1368 | } | |
1369 | EXPORT_SYMBOL(p9_client_fcreate); | |
1370 | ||
7880b43b | 1371 | int p9_client_symlink(struct p9_fid *dfid, const char *name, |
6e195b0f | 1372 | const char *symtgt, kgid_t gid, struct p9_qid *qid) |
50cc42ff VJJ |
1373 | { |
1374 | int err = 0; | |
1375 | struct p9_client *clnt; | |
1376 | struct p9_req_t *req; | |
1377 | ||
5d385153 | 1378 | p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", |
6e195b0f | 1379 | dfid->fid, name, symtgt); |
50cc42ff VJJ |
1380 | clnt = dfid->clnt; |
1381 | ||
f791f7c5 | 1382 | req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, |
6e195b0f | 1383 | gid); |
50cc42ff VJJ |
1384 | if (IS_ERR(req)) { |
1385 | err = PTR_ERR(req); | |
1386 | goto error; | |
1387 | } | |
1388 | ||
523adb6c | 1389 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); |
50cc42ff | 1390 | if (err) { |
523adb6c | 1391 | trace_9p_protocol_dump(clnt, &req->rc); |
50cc42ff VJJ |
1392 | goto free_and_error; |
1393 | } | |
1394 | ||
5d385153 | 1395 | p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", |
6e195b0f | 1396 | qid->type, qid->path, qid->version); |
50cc42ff VJJ |
1397 | |
1398 | free_and_error: | |
43cbcbee | 1399 | p9_tag_remove(clnt, req); |
50cc42ff VJJ |
1400 | error: |
1401 | return err; | |
1402 | } | |
1403 | EXPORT_SYMBOL(p9_client_symlink); | |
1404 | ||
7880b43b | 1405 | int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) |
652df9a7 VJJ |
1406 | { |
1407 | struct p9_client *clnt; | |
1408 | struct p9_req_t *req; | |
1409 | ||
5d385153 | 1410 | p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", |
6e195b0f | 1411 | dfid->fid, oldfid->fid, newname); |
652df9a7 VJJ |
1412 | clnt = dfid->clnt; |
1413 | req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, | |
6e195b0f | 1414 | newname); |
652df9a7 VJJ |
1415 | if (IS_ERR(req)) |
1416 | return PTR_ERR(req); | |
1417 | ||
5d385153 | 1418 | p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); |
43cbcbee | 1419 | p9_tag_remove(clnt, req); |
652df9a7 VJJ |
1420 | return 0; |
1421 | } | |
1422 | EXPORT_SYMBOL(p9_client_link); | |
1423 | ||
b165d601 | 1424 | int p9_client_fsync(struct p9_fid *fid, int datasync) |
920e65dc VJJ |
1425 | { |
1426 | int err; | |
1427 | struct p9_client *clnt; | |
1428 | struct p9_req_t *req; | |
1429 | ||
5d385153 | 1430 | p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", |
6e195b0f | 1431 | fid->fid, datasync); |
920e65dc VJJ |
1432 | err = 0; |
1433 | clnt = fid->clnt; | |
1434 | ||
b165d601 | 1435 | req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); |
920e65dc VJJ |
1436 | if (IS_ERR(req)) { |
1437 | err = PTR_ERR(req); | |
1438 | goto error; | |
1439 | } | |
1440 | ||
5d385153 | 1441 | p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); |
920e65dc | 1442 | |
43cbcbee | 1443 | p9_tag_remove(clnt, req); |
920e65dc VJJ |
1444 | |
1445 | error: | |
1446 | return err; | |
1447 | } | |
1448 | EXPORT_SYMBOL(p9_client_fsync); | |
1449 | ||
bd238fb4 LI |
1450 | int p9_client_clunk(struct p9_fid *fid) |
1451 | { | |
1452 | int err; | |
bd238fb4 | 1453 | struct p9_client *clnt; |
51a87c55 | 1454 | struct p9_req_t *req; |
208f3c28 | 1455 | int retries = 0; |
bd238fb4 | 1456 | |
6636b6dc JW |
1457 | if (!fid || IS_ERR(fid)) { |
1458 | pr_warn("%s (%d): Trying to clunk with invalid fid\n", | |
5d385153 | 1459 | __func__, task_pid_nr(current)); |
8e44a080 | 1460 | dump_stack(); |
1461 | return 0; | |
1462 | } | |
ff5e72eb | 1463 | if (!refcount_dec_and_test(&fid->count)) |
6636b6dc | 1464 | return 0; |
8e44a080 | 1465 | |
208f3c28 | 1466 | again: |
6e195b0f DM |
1467 | p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", |
1468 | fid->fid, retries); | |
bd238fb4 | 1469 | err = 0; |
bd238fb4 LI |
1470 | clnt = fid->clnt; |
1471 | ||
51a87c55 EVH |
1472 | req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); |
1473 | if (IS_ERR(req)) { | |
1474 | err = PTR_ERR(req); | |
1475 | goto error; | |
bd238fb4 LI |
1476 | } |
1477 | ||
5d385153 | 1478 | p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); |
bd238fb4 | 1479 | |
43cbcbee | 1480 | p9_tag_remove(clnt, req); |
51a87c55 | 1481 | error: |
6e195b0f | 1482 | /* Fid is not valid even after a failed clunk |
208f3c28 JG |
1483 | * If interrupted, retry once then give up and |
1484 | * leak fid until umount. | |
5034990e | 1485 | */ |
208f3c28 JG |
1486 | if (err == -ERESTARTSYS) { |
1487 | if (retries++ == 0) | |
1488 | goto again; | |
6e195b0f | 1489 | } else { |
208f3c28 | 1490 | p9_fid_destroy(fid); |
6e195b0f | 1491 | } |
bd238fb4 LI |
1492 | return err; |
1493 | } | |
1494 | EXPORT_SYMBOL(p9_client_clunk); | |
1495 | ||
1496 | int p9_client_remove(struct p9_fid *fid) | |
1497 | { | |
1498 | int err; | |
bd238fb4 | 1499 | struct p9_client *clnt; |
51a87c55 | 1500 | struct p9_req_t *req; |
bd238fb4 | 1501 | |
5d385153 | 1502 | p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); |
bd238fb4 | 1503 | err = 0; |
bd238fb4 LI |
1504 | clnt = fid->clnt; |
1505 | ||
51a87c55 EVH |
1506 | req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); |
1507 | if (IS_ERR(req)) { | |
1508 | err = PTR_ERR(req); | |
1509 | goto error; | |
bd238fb4 LI |
1510 | } |
1511 | ||
5d385153 | 1512 | p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); |
bd238fb4 | 1513 | |
43cbcbee | 1514 | p9_tag_remove(clnt, req); |
51a87c55 | 1515 | error: |
208f3c28 JG |
1516 | if (err == -ERESTARTSYS) |
1517 | p9_client_clunk(fid); | |
1518 | else | |
1519 | p9_fid_destroy(fid); | |
bd238fb4 LI |
1520 | return err; |
1521 | } | |
1522 | EXPORT_SYMBOL(p9_client_remove); | |
1523 | ||
48e370ff AK |
1524 | int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) |
1525 | { | |
1526 | int err = 0; | |
1527 | struct p9_req_t *req; | |
1528 | struct p9_client *clnt; | |
1529 | ||
5d385153 | 1530 | p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", |
6e195b0f | 1531 | dfid->fid, name, flags); |
48e370ff AK |
1532 | |
1533 | clnt = dfid->clnt; | |
1534 | req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); | |
1535 | if (IS_ERR(req)) { | |
1536 | err = PTR_ERR(req); | |
1537 | goto error; | |
1538 | } | |
5d385153 | 1539 | p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); |
48e370ff | 1540 | |
43cbcbee | 1541 | p9_tag_remove(clnt, req); |
48e370ff AK |
1542 | error: |
1543 | return err; | |
1544 | } | |
1545 | EXPORT_SYMBOL(p9_client_unlinkat); | |
1546 | ||
0fc9655e | 1547 | int |
e1200fe6 | 1548 | p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) |
bd238fb4 | 1549 | { |
e1200fe6 | 1550 | int total = 0; |
999b8b88 | 1551 | *err = 0; |
bd238fb4 | 1552 | |
388f6966 SA |
1553 | while (iov_iter_count(to)) { |
1554 | int count; | |
1555 | ||
1556 | count = p9_client_read_once(fid, offset, to, err); | |
1557 | if (!count || *err) | |
1558 | break; | |
1559 | offset += count; | |
1560 | total += count; | |
1561 | } | |
1562 | return total; | |
1563 | } | |
1564 | EXPORT_SYMBOL(p9_client_read); | |
1565 | ||
1566 | int | |
1567 | p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to, | |
1568 | int *err) | |
1569 | { | |
1570 | struct p9_client *clnt = fid->clnt; | |
1571 | struct p9_req_t *req; | |
1572 | int count = iov_iter_count(to); | |
1573 | int rsize, non_zc = 0; | |
1574 | char *dataptr; | |
1575 | ||
1576 | *err = 0; | |
6e195b0f DM |
1577 | p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %zu\n", |
1578 | fid->fid, offset, iov_iter_count(to)); | |
e1200fe6 | 1579 | |
388f6966 SA |
1580 | rsize = fid->iounit; |
1581 | if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) | |
1582 | rsize = clnt->msize - P9_IOHDRSZ; | |
c69f297d | 1583 | |
388f6966 SA |
1584 | if (count < rsize) |
1585 | rsize = count; | |
e1200fe6 | 1586 | |
388f6966 SA |
1587 | /* Don't bother zerocopy for small IO (< 1024) */ |
1588 | if (clnt->trans_mod->zc_request && rsize > 1024) { | |
1589 | /* response header len is 11 | |
1590 | * PDU Header(7) + IO Size (4) | |
1591 | */ | |
1592 | req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, | |
1593 | 0, 11, "dqd", fid->fid, | |
1594 | offset, rsize); | |
1595 | } else { | |
1596 | non_zc = 1; | |
1597 | req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, | |
1598 | rsize); | |
1599 | } | |
1600 | if (IS_ERR(req)) { | |
1601 | *err = PTR_ERR(req); | |
1602 | return 0; | |
1603 | } | |
e1200fe6 | 1604 | |
388f6966 SA |
1605 | *err = p9pdu_readf(&req->rc, clnt->proto_version, |
1606 | "D", &count, &dataptr); | |
1607 | if (*err) { | |
1608 | trace_9p_protocol_dump(clnt, &req->rc); | |
1609 | p9_tag_remove(clnt, req); | |
1610 | return 0; | |
1611 | } | |
1612 | if (rsize < count) { | |
1613 | pr_err("bogus RREAD count (%d > %d)\n", count, rsize); | |
1614 | count = rsize; | |
1615 | } | |
bd238fb4 | 1616 | |
388f6966 | 1617 | p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); |
bd238fb4 | 1618 | |
388f6966 SA |
1619 | if (non_zc) { |
1620 | int n = copy_to_iter(dataptr, count, to); | |
bd238fb4 | 1621 | |
388f6966 SA |
1622 | if (n != count) { |
1623 | *err = -EFAULT; | |
1624 | p9_tag_remove(clnt, req); | |
1625 | return n; | |
e1200fe6 | 1626 | } |
388f6966 SA |
1627 | } else { |
1628 | iov_iter_advance(to, count); | |
51a87c55 | 1629 | } |
388f6966 SA |
1630 | p9_tag_remove(clnt, req); |
1631 | return count; | |
bd238fb4 | 1632 | } |
388f6966 | 1633 | EXPORT_SYMBOL(p9_client_read_once); |
bd238fb4 LI |
1634 | |
1635 | int | |
070b3656 | 1636 | p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) |
bd238fb4 | 1637 | { |
070b3656 | 1638 | struct p9_client *clnt = fid->clnt; |
51a87c55 | 1639 | struct p9_req_t *req; |
070b3656 | 1640 | int total = 0; |
999b8b88 | 1641 | *err = 0; |
070b3656 AV |
1642 | |
1643 | p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n", | |
6e195b0f | 1644 | fid->fid, offset, iov_iter_count(from)); |
070b3656 AV |
1645 | |
1646 | while (iov_iter_count(from)) { | |
1647 | int count = iov_iter_count(from); | |
1648 | int rsize = fid->iounit; | |
6e195b0f DM |
1649 | |
1650 | if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) | |
070b3656 AV |
1651 | rsize = clnt->msize - P9_IOHDRSZ; |
1652 | ||
1653 | if (count < rsize) | |
1654 | rsize = count; | |
1655 | ||
1656 | /* Don't bother zerocopy for small IO (< 1024) */ | |
1657 | if (clnt->trans_mod->zc_request && rsize > 1024) { | |
1658 | req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, | |
1659 | rsize, P9_ZC_HDR_SZ, "dqd", | |
1660 | fid->fid, offset, rsize); | |
1661 | } else { | |
1662 | req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, | |
6e195b0f | 1663 | offset, rsize, from); |
070b3656 AV |
1664 | } |
1665 | if (IS_ERR(req)) { | |
1666 | *err = PTR_ERR(req); | |
1667 | break; | |
1668 | } | |
bd238fb4 | 1669 | |
523adb6c | 1670 | *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &count); |
070b3656 | 1671 | if (*err) { |
523adb6c | 1672 | trace_9p_protocol_dump(clnt, &req->rc); |
43cbcbee | 1673 | p9_tag_remove(clnt, req); |
67e808fb | 1674 | break; |
070b3656 | 1675 | } |
0f1db7de AV |
1676 | if (rsize < count) { |
1677 | pr_err("bogus RWRITE count (%d > %d)\n", count, rsize); | |
1678 | count = rsize; | |
1679 | } | |
1fc52481 | 1680 | |
070b3656 | 1681 | p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); |
0fc9655e | 1682 | |
43cbcbee | 1683 | p9_tag_remove(clnt, req); |
070b3656 AV |
1684 | iov_iter_advance(from, count); |
1685 | total += count; | |
1686 | offset += count; | |
e7f4b8f1 | 1687 | } |
070b3656 | 1688 | return total; |
bd238fb4 | 1689 | } |
0fc9655e | 1690 | EXPORT_SYMBOL(p9_client_write); |
bd238fb4 | 1691 | |
51a87c55 | 1692 | struct p9_wstat *p9_client_stat(struct p9_fid *fid) |
5503ac56 | 1693 | { |
51a87c55 EVH |
1694 | int err; |
1695 | struct p9_client *clnt; | |
6e195b0f | 1696 | struct p9_wstat *ret; |
51a87c55 EVH |
1697 | struct p9_req_t *req; |
1698 | u16 ignored; | |
5503ac56 | 1699 | |
5d385153 | 1700 | p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); |
5503ac56 | 1701 | |
6e195b0f | 1702 | ret = kmalloc(sizeof(*ret), GFP_KERNEL); |
5503ac56 EVH |
1703 | if (!ret) |
1704 | return ERR_PTR(-ENOMEM); | |
1705 | ||
bd238fb4 | 1706 | err = 0; |
bd238fb4 LI |
1707 | clnt = fid->clnt; |
1708 | ||
51a87c55 EVH |
1709 | req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); |
1710 | if (IS_ERR(req)) { | |
1711 | err = PTR_ERR(req); | |
bd238fb4 LI |
1712 | goto error; |
1713 | } | |
1714 | ||
523adb6c | 1715 | err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret); |
e7f4b8f1 | 1716 | if (err) { |
523adb6c | 1717 | trace_9p_protocol_dump(clnt, &req->rc); |
43cbcbee | 1718 | p9_tag_remove(clnt, req); |
eedfe1c4 | 1719 | goto error; |
e7f4b8f1 | 1720 | } |
bd238fb4 | 1721 | |
5d385153 | 1722 | p9_debug(P9_DEBUG_9P, |
6e195b0f DM |
1723 | "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" |
1724 | "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" | |
1725 | "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" | |
1726 | "<<< uid=%d gid=%d n_muid=%d\n", | |
1727 | ret->size, ret->type, ret->dev, ret->qid.type, ret->qid.path, | |
1728 | ret->qid.version, ret->mode, | |
1729 | ret->atime, ret->mtime, ret->length, | |
1730 | ret->name, ret->uid, ret->gid, ret->muid, ret->extension, | |
1731 | from_kuid(&init_user_ns, ret->n_uid), | |
1732 | from_kgid(&init_user_ns, ret->n_gid), | |
1733 | from_kuid(&init_user_ns, ret->n_muid)); | |
bd238fb4 | 1734 | |
43cbcbee | 1735 | p9_tag_remove(clnt, req); |
742b11a7 LI |
1736 | return ret; |
1737 | ||
bd238fb4 | 1738 | error: |
742b11a7 LI |
1739 | kfree(ret); |
1740 | return ERR_PTR(err); | |
bd238fb4 LI |
1741 | } |
1742 | EXPORT_SYMBOL(p9_client_stat); | |
1743 | ||
f0853122 | 1744 | struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, |
6e195b0f | 1745 | u64 request_mask) |
f0853122 SK |
1746 | { |
1747 | int err; | |
1748 | struct p9_client *clnt; | |
6e195b0f | 1749 | struct p9_stat_dotl *ret; |
f0853122 SK |
1750 | struct p9_req_t *req; |
1751 | ||
5d385153 | 1752 | p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", |
6e195b0f | 1753 | fid->fid, request_mask); |
f0853122 | 1754 | |
6e195b0f | 1755 | ret = kmalloc(sizeof(*ret), GFP_KERNEL); |
f0853122 SK |
1756 | if (!ret) |
1757 | return ERR_PTR(-ENOMEM); | |
1758 | ||
1759 | err = 0; | |
1760 | clnt = fid->clnt; | |
1761 | ||
1762 | req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); | |
1763 | if (IS_ERR(req)) { | |
1764 | err = PTR_ERR(req); | |
1765 | goto error; | |
1766 | } | |
1767 | ||
523adb6c | 1768 | err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret); |
f0853122 | 1769 | if (err) { |
523adb6c | 1770 | trace_9p_protocol_dump(clnt, &req->rc); |
43cbcbee | 1771 | p9_tag_remove(clnt, req); |
f0853122 SK |
1772 | goto error; |
1773 | } | |
1774 | ||
6e195b0f DM |
1775 | p9_debug(P9_DEBUG_9P, "<<< RGETATTR st_result_mask=%lld\n" |
1776 | "<<< qid=%x.%llx.%x\n" | |
1777 | "<<< st_mode=%8.8x st_nlink=%llu\n" | |
1778 | "<<< st_uid=%d st_gid=%d\n" | |
1779 | "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" | |
1780 | "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" | |
1781 | "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" | |
1782 | "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" | |
1783 | "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" | |
1784 | "<<< st_gen=%lld st_data_version=%lld\n", | |
1785 | ret->st_result_mask, | |
1786 | ret->qid.type, ret->qid.path, ret->qid.version, | |
1787 | ret->st_mode, ret->st_nlink, | |
1788 | from_kuid(&init_user_ns, ret->st_uid), | |
1789 | from_kgid(&init_user_ns, ret->st_gid), | |
1790 | ret->st_rdev, ret->st_size, ret->st_blksize, ret->st_blocks, | |
1791 | ret->st_atime_sec, ret->st_atime_nsec, | |
1792 | ret->st_mtime_sec, ret->st_mtime_nsec, | |
1793 | ret->st_ctime_sec, ret->st_ctime_nsec, | |
1794 | ret->st_btime_sec, ret->st_btime_nsec, | |
1795 | ret->st_gen, ret->st_data_version); | |
f0853122 | 1796 | |
43cbcbee | 1797 | p9_tag_remove(clnt, req); |
f0853122 SK |
1798 | return ret; |
1799 | ||
1800 | error: | |
1801 | kfree(ret); | |
1802 | return ERR_PTR(err); | |
1803 | } | |
1804 | EXPORT_SYMBOL(p9_client_getattr_dotl); | |
1805 | ||
342fee1d | 1806 | static int p9_client_statsize(struct p9_wstat *wst, int proto_version) |
453ed90d LI |
1807 | { |
1808 | int ret; | |
1809 | ||
9d6939da | 1810 | /* NOTE: size shouldn't include its own length */ |
453ed90d LI |
1811 | /* size[2] type[2] dev[4] qid[13] */ |
1812 | /* mode[4] atime[4] mtime[4] length[8]*/ | |
1813 | /* name[s] uid[s] gid[s] muid[s] */ | |
6e195b0f | 1814 | ret = 2 + 4 + 13 + 4 + 4 + 4 + 8 + 2 + 2 + 2 + 2; |
453ed90d LI |
1815 | |
1816 | if (wst->name) | |
1817 | ret += strlen(wst->name); | |
1818 | if (wst->uid) | |
1819 | ret += strlen(wst->uid); | |
1820 | if (wst->gid) | |
1821 | ret += strlen(wst->gid); | |
1822 | if (wst->muid) | |
1823 | ret += strlen(wst->muid); | |
1824 | ||
6e195b0f DM |
1825 | if (proto_version == p9_proto_2000u || |
1826 | proto_version == p9_proto_2000L) { | |
1827 | /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ | |
1828 | ret += 2 + 4 + 4 + 4; | |
453ed90d LI |
1829 | if (wst->extension) |
1830 | ret += strlen(wst->extension); | |
1831 | } | |
1832 | ||
1833 | return ret; | |
1834 | } | |
1835 | ||
bd238fb4 LI |
1836 | int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) |
1837 | { | |
1838 | int err; | |
51a87c55 | 1839 | struct p9_req_t *req; |
bd238fb4 LI |
1840 | struct p9_client *clnt; |
1841 | ||
453ed90d LI |
1842 | err = 0; |
1843 | clnt = fid->clnt; | |
342fee1d | 1844 | wst->size = p9_client_statsize(wst, clnt->proto_version); |
6e195b0f DM |
1845 | p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", |
1846 | fid->fid); | |
5d385153 | 1847 | p9_debug(P9_DEBUG_9P, |
6e195b0f DM |
1848 | " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" |
1849 | " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" | |
1850 | " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" | |
1851 | " uid=%d gid=%d n_muid=%d\n", | |
1852 | wst->size, wst->type, wst->dev, wst->qid.type, | |
1853 | wst->qid.path, wst->qid.version, | |
1854 | wst->mode, wst->atime, wst->mtime, wst->length, | |
1855 | wst->name, wst->uid, wst->gid, wst->muid, wst->extension, | |
1856 | from_kuid(&init_user_ns, wst->n_uid), | |
1857 | from_kgid(&init_user_ns, wst->n_gid), | |
1858 | from_kuid(&init_user_ns, wst->n_muid)); | |
1859 | ||
1860 | req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", | |
1861 | fid->fid, wst->size + 2, wst); | |
51a87c55 EVH |
1862 | if (IS_ERR(req)) { |
1863 | err = PTR_ERR(req); | |
1864 | goto error; | |
bd238fb4 LI |
1865 | } |
1866 | ||
5d385153 | 1867 | p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); |
bd238fb4 | 1868 | |
43cbcbee | 1869 | p9_tag_remove(clnt, req); |
51a87c55 | 1870 | error: |
bd238fb4 LI |
1871 | return err; |
1872 | } | |
1873 | EXPORT_SYMBOL(p9_client_wstat); | |
bda8e775 | 1874 | |
87d7845a SK |
1875 | int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) |
1876 | { | |
1877 | int err; | |
1878 | struct p9_req_t *req; | |
1879 | struct p9_client *clnt; | |
1880 | ||
1881 | err = 0; | |
1882 | clnt = fid->clnt; | |
5d385153 | 1883 | p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); |
6e195b0f DM |
1884 | p9_debug(P9_DEBUG_9P, " valid=%x mode=%x uid=%d gid=%d size=%lld\n", |
1885 | p9attr->valid, p9attr->mode, | |
1886 | from_kuid(&init_user_ns, p9attr->uid), | |
1887 | from_kgid(&init_user_ns, p9attr->gid), | |
1888 | p9attr->size); | |
1889 | p9_debug(P9_DEBUG_9P, " atime_sec=%lld atime_nsec=%lld\n", | |
1890 | p9attr->atime_sec, p9attr->atime_nsec); | |
1891 | p9_debug(P9_DEBUG_9P, " mtime_sec=%lld mtime_nsec=%lld\n", | |
1892 | p9attr->mtime_sec, p9attr->mtime_nsec); | |
87d7845a SK |
1893 | |
1894 | req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); | |
1895 | ||
1896 | if (IS_ERR(req)) { | |
1897 | err = PTR_ERR(req); | |
1898 | goto error; | |
1899 | } | |
5d385153 | 1900 | p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); |
43cbcbee | 1901 | p9_tag_remove(clnt, req); |
87d7845a SK |
1902 | error: |
1903 | return err; | |
1904 | } | |
1905 | EXPORT_SYMBOL(p9_client_setattr); | |
1906 | ||
bda8e775 SK |
1907 | int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) |
1908 | { | |
1909 | int err; | |
1910 | struct p9_req_t *req; | |
1911 | struct p9_client *clnt; | |
1912 | ||
1913 | err = 0; | |
1914 | clnt = fid->clnt; | |
1915 | ||
5d385153 | 1916 | p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); |
bda8e775 SK |
1917 | |
1918 | req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); | |
1919 | if (IS_ERR(req)) { | |
1920 | err = PTR_ERR(req); | |
1921 | goto error; | |
1922 | } | |
1923 | ||
523adb6c DM |
1924 | err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, |
1925 | &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, | |
1926 | &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); | |
bda8e775 | 1927 | if (err) { |
523adb6c | 1928 | trace_9p_protocol_dump(clnt, &req->rc); |
43cbcbee | 1929 | p9_tag_remove(clnt, req); |
bda8e775 SK |
1930 | goto error; |
1931 | } | |
1932 | ||
6e195b0f DM |
1933 | p9_debug(P9_DEBUG_9P, |
1934 | "<<< RSTATFS fid %d type 0x%x bsize %u blocks %llu bfree %llu bavail %llu files %llu ffree %llu fsid %llu namelen %u\n", | |
1935 | fid->fid, sb->type, sb->bsize, sb->blocks, sb->bfree, | |
1936 | sb->bavail, sb->files, sb->ffree, sb->fsid, sb->namelen); | |
bda8e775 | 1937 | |
43cbcbee | 1938 | p9_tag_remove(clnt, req); |
bda8e775 SK |
1939 | error: |
1940 | return err; | |
1941 | } | |
1942 | EXPORT_SYMBOL(p9_client_statfs); | |
4681dbda | 1943 | |
9e8fb38e AK |
1944 | int p9_client_rename(struct p9_fid *fid, |
1945 | struct p9_fid *newdirfid, const char *name) | |
4681dbda SK |
1946 | { |
1947 | int err; | |
1948 | struct p9_req_t *req; | |
1949 | struct p9_client *clnt; | |
1950 | ||
1951 | err = 0; | |
1952 | clnt = fid->clnt; | |
1953 | ||
5d385153 | 1954 | p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", |
6e195b0f | 1955 | fid->fid, newdirfid->fid, name); |
4681dbda SK |
1956 | |
1957 | req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, | |
6e195b0f | 1958 | newdirfid->fid, name); |
4681dbda SK |
1959 | if (IS_ERR(req)) { |
1960 | err = PTR_ERR(req); | |
1961 | goto error; | |
1962 | } | |
1963 | ||
5d385153 | 1964 | p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); |
4681dbda | 1965 | |
43cbcbee | 1966 | p9_tag_remove(clnt, req); |
4681dbda SK |
1967 | error: |
1968 | return err; | |
1969 | } | |
1970 | EXPORT_SYMBOL(p9_client_rename); | |
1971 | ||
9e8fb38e AK |
1972 | int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, |
1973 | struct p9_fid *newdirfid, const char *new_name) | |
1974 | { | |
1975 | int err; | |
1976 | struct p9_req_t *req; | |
1977 | struct p9_client *clnt; | |
1978 | ||
1979 | err = 0; | |
1980 | clnt = olddirfid->clnt; | |
1981 | ||
6e195b0f DM |
1982 | p9_debug(P9_DEBUG_9P, |
1983 | ">>> TRENAMEAT olddirfid %d old name %s newdirfid %d new name %s\n", | |
1984 | olddirfid->fid, old_name, newdirfid->fid, new_name); | |
9e8fb38e AK |
1985 | |
1986 | req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, | |
1987 | old_name, newdirfid->fid, new_name); | |
1988 | if (IS_ERR(req)) { | |
1989 | err = PTR_ERR(req); | |
1990 | goto error; | |
1991 | } | |
1992 | ||
5d385153 | 1993 | p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", |
6e195b0f | 1994 | newdirfid->fid, new_name); |
9e8fb38e | 1995 | |
43cbcbee | 1996 | p9_tag_remove(clnt, req); |
9e8fb38e AK |
1997 | error: |
1998 | return err; | |
1999 | } | |
2000 | EXPORT_SYMBOL(p9_client_renameat); | |
2001 | ||
6e195b0f | 2002 | /* An xattrwalk without @attr_name gives the fid for the lisxattr namespace |
0ef63f34 AK |
2003 | */ |
2004 | struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, | |
6e195b0f | 2005 | const char *attr_name, u64 *attr_size) |
0ef63f34 AK |
2006 | { |
2007 | int err; | |
2008 | struct p9_req_t *req; | |
2009 | struct p9_client *clnt; | |
2010 | struct p9_fid *attr_fid; | |
2011 | ||
2012 | err = 0; | |
2013 | clnt = file_fid->clnt; | |
2014 | attr_fid = p9_fid_create(clnt); | |
b5303be2 MW |
2015 | if (!attr_fid) { |
2016 | err = -ENOMEM; | |
0ef63f34 AK |
2017 | goto error; |
2018 | } | |
5d385153 | 2019 | p9_debug(P9_DEBUG_9P, |
6e195b0f DM |
2020 | ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", |
2021 | file_fid->fid, attr_fid->fid, attr_name); | |
0ef63f34 AK |
2022 | |
2023 | req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", | |
6e195b0f | 2024 | file_fid->fid, attr_fid->fid, attr_name); |
0ef63f34 AK |
2025 | if (IS_ERR(req)) { |
2026 | err = PTR_ERR(req); | |
2027 | goto error; | |
2028 | } | |
523adb6c | 2029 | err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size); |
0ef63f34 | 2030 | if (err) { |
523adb6c | 2031 | trace_9p_protocol_dump(clnt, &req->rc); |
43cbcbee | 2032 | p9_tag_remove(clnt, req); |
0ef63f34 AK |
2033 | goto clunk_fid; |
2034 | } | |
43cbcbee | 2035 | p9_tag_remove(clnt, req); |
5d385153 | 2036 | p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", |
6e195b0f | 2037 | attr_fid->fid, *attr_size); |
0ef63f34 AK |
2038 | return attr_fid; |
2039 | clunk_fid: | |
2040 | p9_client_clunk(attr_fid); | |
2041 | attr_fid = NULL; | |
2042 | error: | |
6e195b0f | 2043 | if (attr_fid && attr_fid != file_fid) |
0ef63f34 AK |
2044 | p9_fid_destroy(attr_fid); |
2045 | ||
2046 | return ERR_PTR(err); | |
2047 | } | |
2048 | EXPORT_SYMBOL_GPL(p9_client_xattrwalk); | |
2049 | ||
eda25e46 | 2050 | int p9_client_xattrcreate(struct p9_fid *fid, const char *name, |
6e195b0f | 2051 | u64 attr_size, int flags) |
eda25e46 AK |
2052 | { |
2053 | int err; | |
2054 | struct p9_req_t *req; | |
2055 | struct p9_client *clnt; | |
2056 | ||
5d385153 | 2057 | p9_debug(P9_DEBUG_9P, |
6e195b0f DM |
2058 | ">>> TXATTRCREATE fid %d name %s size %llu flag %d\n", |
2059 | fid->fid, name, attr_size, flags); | |
eda25e46 AK |
2060 | err = 0; |
2061 | clnt = fid->clnt; | |
2062 | req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", | |
6e195b0f | 2063 | fid->fid, name, attr_size, flags); |
eda25e46 AK |
2064 | if (IS_ERR(req)) { |
2065 | err = PTR_ERR(req); | |
2066 | goto error; | |
2067 | } | |
5d385153 | 2068 | p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); |
43cbcbee | 2069 | p9_tag_remove(clnt, req); |
eda25e46 AK |
2070 | error: |
2071 | return err; | |
2072 | } | |
2073 | EXPORT_SYMBOL_GPL(p9_client_xattrcreate); | |
2074 | ||
7751bdb3 SK |
2075 | int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) |
2076 | { | |
abfa034e | 2077 | int err, rsize, non_zc = 0; |
7751bdb3 SK |
2078 | struct p9_client *clnt; |
2079 | struct p9_req_t *req; | |
2080 | char *dataptr; | |
4f3b35c1 AV |
2081 | struct kvec kv = {.iov_base = data, .iov_len = count}; |
2082 | struct iov_iter to; | |
2083 | ||
aa563d7b | 2084 | iov_iter_kvec(&to, READ, &kv, 1, count); |
7751bdb3 | 2085 | |
5d385153 | 2086 | p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", |
6e195b0f | 2087 | fid->fid, offset, count); |
7751bdb3 SK |
2088 | |
2089 | err = 0; | |
2090 | clnt = fid->clnt; | |
7751bdb3 SK |
2091 | |
2092 | rsize = fid->iounit; | |
6e195b0f | 2093 | if (!rsize || rsize > clnt->msize - P9_READDIRHDRSZ) |
7751bdb3 SK |
2094 | rsize = clnt->msize - P9_READDIRHDRSZ; |
2095 | ||
2096 | if (count < rsize) | |
2097 | rsize = count; | |
2098 | ||
abfa034e AK |
2099 | /* Don't bother zerocopy for small IO (< 1024) */ |
2100 | if (clnt->trans_mod->zc_request && rsize > 1024) { | |
6e195b0f | 2101 | /* response header len is 11 |
abfa034e AK |
2102 | * PDU Header(7) + IO Size (4) |
2103 | */ | |
4f3b35c1 AV |
2104 | req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, |
2105 | 11, "dqd", fid->fid, offset, rsize); | |
2c66523f | 2106 | } else { |
abfa034e | 2107 | non_zc = 1; |
2c66523f | 2108 | req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, |
abfa034e | 2109 | offset, rsize); |
2c66523f | 2110 | } |
7751bdb3 SK |
2111 | if (IS_ERR(req)) { |
2112 | err = PTR_ERR(req); | |
2113 | goto error; | |
2114 | } | |
2115 | ||
523adb6c | 2116 | err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr); |
7751bdb3 | 2117 | if (err) { |
523adb6c | 2118 | trace_9p_protocol_dump(clnt, &req->rc); |
7751bdb3 SK |
2119 | goto free_and_error; |
2120 | } | |
71d6ad08 AV |
2121 | if (rsize < count) { |
2122 | pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); | |
2123 | count = rsize; | |
2124 | } | |
7751bdb3 | 2125 | |
5d385153 | 2126 | p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); |
7751bdb3 | 2127 | |
abfa034e | 2128 | if (non_zc) |
7751bdb3 SK |
2129 | memmove(data, dataptr, count); |
2130 | ||
43cbcbee | 2131 | p9_tag_remove(clnt, req); |
7751bdb3 SK |
2132 | return count; |
2133 | ||
2134 | free_and_error: | |
43cbcbee | 2135 | p9_tag_remove(clnt, req); |
7751bdb3 SK |
2136 | error: |
2137 | return err; | |
2138 | } | |
2139 | EXPORT_SYMBOL(p9_client_readdir); | |
4b43516a | 2140 | |
7880b43b | 2141 | int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, |
6e195b0f | 2142 | dev_t rdev, kgid_t gid, struct p9_qid *qid) |
4b43516a MK |
2143 | { |
2144 | int err; | |
2145 | struct p9_client *clnt; | |
2146 | struct p9_req_t *req; | |
2147 | ||
2148 | err = 0; | |
2149 | clnt = fid->clnt; | |
6e195b0f DM |
2150 | p9_debug(P9_DEBUG_9P, |
2151 | ">>> TMKNOD fid %d name %s mode %d major %d minor %d\n", | |
2152 | fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); | |
f791f7c5 | 2153 | req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, |
6e195b0f | 2154 | MAJOR(rdev), MINOR(rdev), gid); |
4b43516a MK |
2155 | if (IS_ERR(req)) |
2156 | return PTR_ERR(req); | |
2157 | ||
523adb6c | 2158 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); |
4b43516a | 2159 | if (err) { |
523adb6c | 2160 | trace_9p_protocol_dump(clnt, &req->rc); |
4b43516a MK |
2161 | goto error; |
2162 | } | |
6e195b0f DM |
2163 | p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", |
2164 | qid->type, qid->path, qid->version); | |
4b43516a MK |
2165 | |
2166 | error: | |
43cbcbee | 2167 | p9_tag_remove(clnt, req); |
4b43516a | 2168 | return err; |
4b43516a MK |
2169 | } |
2170 | EXPORT_SYMBOL(p9_client_mknod_dotl); | |
01a622bd | 2171 | |
7880b43b | 2172 | int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, |
6e195b0f | 2173 | kgid_t gid, struct p9_qid *qid) |
01a622bd MK |
2174 | { |
2175 | int err; | |
2176 | struct p9_client *clnt; | |
2177 | struct p9_req_t *req; | |
2178 | ||
2179 | err = 0; | |
2180 | clnt = fid->clnt; | |
5d385153 | 2181 | p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", |
f791f7c5 | 2182 | fid->fid, name, mode, from_kgid(&init_user_ns, gid)); |
6e195b0f DM |
2183 | req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", |
2184 | fid->fid, name, mode, gid); | |
01a622bd MK |
2185 | if (IS_ERR(req)) |
2186 | return PTR_ERR(req); | |
2187 | ||
523adb6c | 2188 | err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); |
01a622bd | 2189 | if (err) { |
523adb6c | 2190 | trace_9p_protocol_dump(clnt, &req->rc); |
01a622bd MK |
2191 | goto error; |
2192 | } | |
5d385153 | 2193 | p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, |
6e195b0f | 2194 | qid->path, qid->version); |
01a622bd MK |
2195 | |
2196 | error: | |
43cbcbee | 2197 | p9_tag_remove(clnt, req); |
01a622bd | 2198 | return err; |
01a622bd MK |
2199 | } |
2200 | EXPORT_SYMBOL(p9_client_mkdir_dotl); | |
a099027c MK |
2201 | |
2202 | int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) | |
2203 | { | |
2204 | int err; | |
2205 | struct p9_client *clnt; | |
2206 | struct p9_req_t *req; | |
2207 | ||
2208 | err = 0; | |
2209 | clnt = fid->clnt; | |
6e195b0f DM |
2210 | p9_debug(P9_DEBUG_9P, |
2211 | ">>> TLOCK fid %d type %i flags %d start %lld length %lld proc_id %d client_id %s\n", | |
2212 | fid->fid, flock->type, flock->flags, flock->start, | |
2213 | flock->length, flock->proc_id, flock->client_id); | |
a099027c MK |
2214 | |
2215 | req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, | |
6e195b0f DM |
2216 | flock->flags, flock->start, flock->length, |
2217 | flock->proc_id, flock->client_id); | |
a099027c MK |
2218 | |
2219 | if (IS_ERR(req)) | |
2220 | return PTR_ERR(req); | |
2221 | ||
523adb6c | 2222 | err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status); |
a099027c | 2223 | if (err) { |
523adb6c | 2224 | trace_9p_protocol_dump(clnt, &req->rc); |
a099027c MK |
2225 | goto error; |
2226 | } | |
5d385153 | 2227 | p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); |
a099027c | 2228 | error: |
43cbcbee | 2229 | p9_tag_remove(clnt, req); |
a099027c | 2230 | return err; |
a099027c MK |
2231 | } |
2232 | EXPORT_SYMBOL(p9_client_lock_dotl); | |
1d769cd1 MK |
2233 | |
2234 | int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) | |
2235 | { | |
2236 | int err; | |
2237 | struct p9_client *clnt; | |
2238 | struct p9_req_t *req; | |
2239 | ||
2240 | err = 0; | |
2241 | clnt = fid->clnt; | |
6e195b0f DM |
2242 | p9_debug(P9_DEBUG_9P, |
2243 | ">>> TGETLOCK fid %d, type %i start %lld length %lld proc_id %d client_id %s\n", | |
2244 | fid->fid, glock->type, glock->start, glock->length, | |
2245 | glock->proc_id, glock->client_id); | |
1d769cd1 | 2246 | |
6e195b0f DM |
2247 | req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, |
2248 | glock->type, glock->start, glock->length, | |
2249 | glock->proc_id, glock->client_id); | |
1d769cd1 MK |
2250 | |
2251 | if (IS_ERR(req)) | |
2252 | return PTR_ERR(req); | |
2253 | ||
523adb6c DM |
2254 | err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type, |
2255 | &glock->start, &glock->length, &glock->proc_id, | |
2256 | &glock->client_id); | |
1d769cd1 | 2257 | if (err) { |
523adb6c | 2258 | trace_9p_protocol_dump(clnt, &req->rc); |
1d769cd1 MK |
2259 | goto error; |
2260 | } | |
6e195b0f DM |
2261 | p9_debug(P9_DEBUG_9P, |
2262 | "<<< RGETLOCK type %i start %lld length %lld proc_id %d client_id %s\n", | |
2263 | glock->type, glock->start, glock->length, | |
2264 | glock->proc_id, glock->client_id); | |
1d769cd1 | 2265 | error: |
43cbcbee | 2266 | p9_tag_remove(clnt, req); |
1d769cd1 MK |
2267 | return err; |
2268 | } | |
2269 | EXPORT_SYMBOL(p9_client_getlock_dotl); | |
329176cc MK |
2270 | |
2271 | int p9_client_readlink(struct p9_fid *fid, char **target) | |
2272 | { | |
2273 | int err; | |
2274 | struct p9_client *clnt; | |
2275 | struct p9_req_t *req; | |
2276 | ||
2277 | err = 0; | |
2278 | clnt = fid->clnt; | |
5d385153 | 2279 | p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); |
329176cc MK |
2280 | |
2281 | req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); | |
2282 | if (IS_ERR(req)) | |
2283 | return PTR_ERR(req); | |
2284 | ||
523adb6c | 2285 | err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target); |
329176cc | 2286 | if (err) { |
523adb6c | 2287 | trace_9p_protocol_dump(clnt, &req->rc); |
329176cc MK |
2288 | goto error; |
2289 | } | |
5d385153 | 2290 | p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); |
329176cc | 2291 | error: |
43cbcbee | 2292 | p9_tag_remove(clnt, req); |
329176cc MK |
2293 | return err; |
2294 | } | |
2295 | EXPORT_SYMBOL(p9_client_readlink); | |
996d5b4d MW |
2296 | |
2297 | int __init p9_client_init(void) | |
2298 | { | |
728356de | 2299 | p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); |
996d5b4d MW |
2300 | return p9_req_cache ? 0 : -ENOMEM; |
2301 | } | |
2302 | ||
2303 | void __exit p9_client_exit(void) | |
2304 | { | |
2305 | kmem_cache_destroy(p9_req_cache); | |
2306 | } |