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Commit | Line | Data |
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b8cf945b | 1 | /* |
67543e50 | 2 | * linux/fs/9p/fcall.c |
b8cf945b | 3 | * |
531b1094 | 4 | * This file contains functions to perform synchronous 9P calls |
b8cf945b | 5 | * |
531b1094 | 6 | * Copyright (C) 2004 by Latchesar Ionkov <lucho@ionkov.net> |
b8cf945b EVH |
7 | * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> |
8 | * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
42e8c509 EVH |
11 | * it under the terms of the GNU General Public License version 2 |
12 | * as published by the Free Software Foundation. | |
b8cf945b EVH |
13 | * |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to: | |
21 | * Free Software Foundation | |
22 | * 51 Franklin Street, Fifth Floor | |
23 | * Boston, MA 02111-1301 USA | |
24 | * | |
25 | */ | |
26 | ||
b8cf945b EVH |
27 | #include <linux/module.h> |
28 | #include <linux/errno.h> | |
29 | #include <linux/fs.h> | |
914e2637 | 30 | #include <linux/sched.h> |
b8cf945b EVH |
31 | #include <linux/idr.h> |
32 | ||
33 | #include "debug.h" | |
34 | #include "v9fs.h" | |
35 | #include "9p.h" | |
531b1094 | 36 | #include "conv.h" |
b8cf945b EVH |
37 | #include "mux.h" |
38 | ||
39 | /** | |
40 | * v9fs_t_version - negotiate protocol parameters with sever | |
41 | * @v9ses: 9P2000 session information | |
42 | * @msize: requested max size packet | |
43 | * @version: requested version.extension string | |
44 | * @fcall: pointer to response fcall pointer | |
45 | * | |
46 | */ | |
47 | ||
48 | int | |
49 | v9fs_t_version(struct v9fs_session_info *v9ses, u32 msize, | |
531b1094 | 50 | char *version, struct v9fs_fcall **rcp) |
b8cf945b | 51 | { |
531b1094 LI |
52 | int ret; |
53 | struct v9fs_fcall *tc; | |
b8cf945b EVH |
54 | |
55 | dprintk(DEBUG_9P, "msize: %d version: %s\n", msize, version); | |
531b1094 | 56 | tc = v9fs_create_tversion(msize, version); |
b8cf945b | 57 | |
531b1094 LI |
58 | if (!IS_ERR(tc)) { |
59 | ret = v9fs_mux_rpc(v9ses->mux, tc, rcp); | |
60 | kfree(tc); | |
61 | } else | |
62 | ret = PTR_ERR(tc); | |
63 | ||
64 | return ret; | |
b8cf945b EVH |
65 | } |
66 | ||
67 | /** | |
68 | * v9fs_t_attach - mount the server | |
69 | * @v9ses: 9P2000 session information | |
70 | * @uname: user name doing the attach | |
71 | * @aname: remote name being attached to | |
72 | * @fid: mount fid to attatch to root node | |
73 | * @afid: authentication fid (in this case result key) | |
74 | * @fcall: pointer to response fcall pointer | |
75 | * | |
76 | */ | |
77 | ||
78 | int | |
79 | v9fs_t_attach(struct v9fs_session_info *v9ses, char *uname, char *aname, | |
531b1094 | 80 | u32 fid, u32 afid, struct v9fs_fcall **rcp) |
b8cf945b | 81 | { |
531b1094 LI |
82 | int ret; |
83 | struct v9fs_fcall* tc; | |
b8cf945b EVH |
84 | |
85 | dprintk(DEBUG_9P, "uname '%s' aname '%s' fid %d afid %d\n", uname, | |
86 | aname, fid, afid); | |
b8cf945b | 87 | |
531b1094 LI |
88 | tc = v9fs_create_tattach(fid, afid, uname, aname); |
89 | if (!IS_ERR(tc)) { | |
90 | ret = v9fs_mux_rpc(v9ses->mux, tc, rcp); | |
91 | kfree(tc); | |
92 | } else | |
93 | ret = PTR_ERR(tc); | |
94 | ||
95 | return ret; | |
3cf6429a LI |
96 | } |
97 | ||
98 | static void v9fs_t_clunk_cb(void *a, struct v9fs_fcall *tc, | |
99 | struct v9fs_fcall *rc, int err) | |
100 | { | |
343f1fe6 | 101 | int fid, id; |
3cf6429a LI |
102 | struct v9fs_session_info *v9ses; |
103 | ||
343f1fe6 | 104 | id = 0; |
3cf6429a | 105 | fid = tc->params.tclunk.fid; |
343f1fe6 LI |
106 | if (rc) |
107 | id = rc->id; | |
3cf6429a | 108 | |
343f1fe6 | 109 | kfree(tc); |
3cf6429a | 110 | kfree(rc); |
343f1fe6 LI |
111 | if (id == RCLUNK) { |
112 | v9ses = a; | |
113 | v9fs_put_idpool(fid, &v9ses->fidpool); | |
114 | } | |
b8cf945b EVH |
115 | } |
116 | ||
117 | /** | |
118 | * v9fs_t_clunk - release a fid (finish a transaction) | |
119 | * @v9ses: 9P2000 session information | |
120 | * @fid: fid to release | |
121 | * @fcall: pointer to response fcall pointer | |
122 | * | |
123 | */ | |
531b1094 | 124 | |
b8cf945b | 125 | int |
3cf6429a | 126 | v9fs_t_clunk(struct v9fs_session_info *v9ses, u32 fid) |
b8cf945b | 127 | { |
531b1094 | 128 | int ret; |
3cf6429a LI |
129 | struct v9fs_fcall *tc, *rc; |
130 | ||
b8cf945b | 131 | dprintk(DEBUG_9P, "fid %d\n", fid); |
b8cf945b | 132 | |
531b1094 LI |
133 | rc = NULL; |
134 | tc = v9fs_create_tclunk(fid); | |
135 | if (!IS_ERR(tc)) | |
136 | ret = v9fs_mux_rpc(v9ses->mux, tc, &rc); | |
137 | else | |
138 | ret = PTR_ERR(tc); | |
139 | ||
140 | if (ret) | |
141 | dprintk(DEBUG_ERROR, "failed fid %d err %d\n", fid, ret); | |
3cf6429a | 142 | |
531b1094 LI |
143 | v9fs_t_clunk_cb(v9ses, tc, rc, ret); |
144 | return ret; | |
b8cf945b EVH |
145 | } |
146 | ||
29c6e486 | 147 | #if 0 |
b8cf945b EVH |
148 | /** |
149 | * v9fs_v9fs_t_flush - flush a pending transaction | |
150 | * @v9ses: 9P2000 session information | |
4a26c242 | 151 | * @tag: tag to release |
b8cf945b EVH |
152 | * |
153 | */ | |
531b1094 | 154 | int v9fs_t_flush(struct v9fs_session_info *v9ses, u16 oldtag) |
b8cf945b | 155 | { |
531b1094 LI |
156 | int ret; |
157 | struct v9fs_fcall *tc; | |
b8cf945b | 158 | |
531b1094 LI |
159 | dprintk(DEBUG_9P, "oldtag %d\n", oldtag); |
160 | ||
531b1094 LI |
161 | tc = v9fs_create_tflush(oldtag); |
162 | if (!IS_ERR(tc)) { | |
163 | ret = v9fs_mux_rpc(v9ses->mux, tc, NULL); | |
164 | kfree(tc); | |
165 | } else | |
166 | ret = PTR_ERR(tc); | |
167 | ||
168 | return ret; | |
b8cf945b | 169 | } |
67543e50 | 170 | #endif |
b8cf945b EVH |
171 | |
172 | /** | |
173 | * v9fs_t_stat - read a file's meta-data | |
174 | * @v9ses: 9P2000 session information | |
175 | * @fid: fid pointing to file or directory to get info about | |
176 | * @fcall: pointer to response fcall | |
177 | * | |
178 | */ | |
179 | ||
180 | int | |
531b1094 | 181 | v9fs_t_stat(struct v9fs_session_info *v9ses, u32 fid, struct v9fs_fcall **rcp) |
b8cf945b | 182 | { |
531b1094 LI |
183 | int ret; |
184 | struct v9fs_fcall *tc; | |
b8cf945b EVH |
185 | |
186 | dprintk(DEBUG_9P, "fid %d\n", fid); | |
b8cf945b | 187 | |
531b1094 LI |
188 | ret = -ENOMEM; |
189 | tc = v9fs_create_tstat(fid); | |
190 | if (!IS_ERR(tc)) { | |
191 | ret = v9fs_mux_rpc(v9ses->mux, tc, rcp); | |
192 | kfree(tc); | |
193 | } else | |
194 | ret = PTR_ERR(tc); | |
195 | ||
196 | return ret; | |
b8cf945b EVH |
197 | } |
198 | ||
199 | /** | |
200 | * v9fs_t_wstat - write a file's meta-data | |
201 | * @v9ses: 9P2000 session information | |
202 | * @fid: fid pointing to file or directory to write info about | |
203 | * @stat: metadata | |
204 | * @fcall: pointer to response fcall | |
205 | * | |
206 | */ | |
207 | ||
208 | int | |
209 | v9fs_t_wstat(struct v9fs_session_info *v9ses, u32 fid, | |
531b1094 | 210 | struct v9fs_wstat *wstat, struct v9fs_fcall **rcp) |
b8cf945b | 211 | { |
531b1094 LI |
212 | int ret; |
213 | struct v9fs_fcall *tc; | |
b8cf945b | 214 | |
531b1094 LI |
215 | dprintk(DEBUG_9P, "fid %d\n", fid); |
216 | ||
531b1094 LI |
217 | tc = v9fs_create_twstat(fid, wstat, v9ses->extended); |
218 | if (!IS_ERR(tc)) { | |
219 | ret = v9fs_mux_rpc(v9ses->mux, tc, rcp); | |
220 | kfree(tc); | |
221 | } else | |
222 | ret = PTR_ERR(tc); | |
b8cf945b | 223 | |
531b1094 | 224 | return ret; |
b8cf945b EVH |
225 | } |
226 | ||
227 | /** | |
228 | * v9fs_t_walk - walk a fid to a new file or directory | |
229 | * @v9ses: 9P2000 session information | |
230 | * @fid: fid to walk | |
231 | * @newfid: new fid (for clone operations) | |
232 | * @name: path to walk fid to | |
233 | * @fcall: pointer to response fcall | |
234 | * | |
235 | */ | |
236 | ||
237 | /* TODO: support multiple walk */ | |
238 | ||
239 | int | |
240 | v9fs_t_walk(struct v9fs_session_info *v9ses, u32 fid, u32 newfid, | |
531b1094 | 241 | char *name, struct v9fs_fcall **rcp) |
b8cf945b | 242 | { |
531b1094 LI |
243 | int ret; |
244 | struct v9fs_fcall *tc; | |
245 | int nwname; | |
b8cf945b EVH |
246 | |
247 | dprintk(DEBUG_9P, "fid %d newfid %d wname '%s'\n", fid, newfid, name); | |
531b1094 LI |
248 | |
249 | if (name) | |
250 | nwname = 1; | |
251 | else | |
252 | nwname = 0; | |
253 | ||
531b1094 LI |
254 | tc = v9fs_create_twalk(fid, newfid, nwname, &name); |
255 | if (!IS_ERR(tc)) { | |
256 | ret = v9fs_mux_rpc(v9ses->mux, tc, rcp); | |
257 | kfree(tc); | |
258 | } else | |
259 | ret = PTR_ERR(tc); | |
260 | ||
261 | return ret; | |
b8cf945b EVH |
262 | } |
263 | ||
264 | /** | |
265 | * v9fs_t_open - open a file | |
266 | * | |
267 | * @v9ses - 9P2000 session information | |
268 | * @fid - fid to open | |
269 | * @mode - mode to open file (R, RW, etc) | |
270 | * @fcall - pointer to response fcall | |
271 | * | |
272 | */ | |
273 | ||
274 | int | |
275 | v9fs_t_open(struct v9fs_session_info *v9ses, u32 fid, u8 mode, | |
531b1094 | 276 | struct v9fs_fcall **rcp) |
b8cf945b | 277 | { |
531b1094 LI |
278 | int ret; |
279 | struct v9fs_fcall *tc; | |
b8cf945b EVH |
280 | |
281 | dprintk(DEBUG_9P, "fid %d mode %d\n", fid, mode); | |
b8cf945b | 282 | |
531b1094 LI |
283 | tc = v9fs_create_topen(fid, mode); |
284 | if (!IS_ERR(tc)) { | |
285 | ret = v9fs_mux_rpc(v9ses->mux, tc, rcp); | |
286 | kfree(tc); | |
287 | } else | |
288 | ret = PTR_ERR(tc); | |
b8cf945b | 289 | |
531b1094 | 290 | return ret; |
b8cf945b EVH |
291 | } |
292 | ||
293 | /** | |
294 | * v9fs_t_remove - remove a file or directory | |
295 | * @v9ses: 9P2000 session information | |
296 | * @fid: fid to remove | |
297 | * @fcall: pointer to response fcall | |
298 | * | |
299 | */ | |
300 | ||
301 | int | |
302 | v9fs_t_remove(struct v9fs_session_info *v9ses, u32 fid, | |
531b1094 | 303 | struct v9fs_fcall **rcp) |
b8cf945b | 304 | { |
531b1094 LI |
305 | int ret; |
306 | struct v9fs_fcall *tc; | |
b8cf945b EVH |
307 | |
308 | dprintk(DEBUG_9P, "fid %d\n", fid); | |
531b1094 | 309 | |
531b1094 LI |
310 | tc = v9fs_create_tremove(fid); |
311 | if (!IS_ERR(tc)) { | |
312 | ret = v9fs_mux_rpc(v9ses->mux, tc, rcp); | |
313 | kfree(tc); | |
314 | } else | |
315 | ret = PTR_ERR(tc); | |
316 | ||
317 | return ret; | |
b8cf945b EVH |
318 | } |
319 | ||
320 | /** | |
321 | * v9fs_t_create - create a file or directory | |
322 | * @v9ses: 9P2000 session information | |
323 | * @fid: fid to create | |
324 | * @name: name of the file or directory to create | |
325 | * @perm: permissions to create with | |
326 | * @mode: mode to open file (R, RW, etc) | |
327 | * @fcall: pointer to response fcall | |
328 | * | |
329 | */ | |
330 | ||
331 | int | |
16cce6d2 LI |
332 | v9fs_t_create(struct v9fs_session_info *v9ses, u32 fid, char *name, u32 perm, |
333 | u8 mode, char *extension, struct v9fs_fcall **rcp) | |
b8cf945b | 334 | { |
531b1094 LI |
335 | int ret; |
336 | struct v9fs_fcall *tc; | |
b8cf945b EVH |
337 | |
338 | dprintk(DEBUG_9P, "fid %d name '%s' perm %x mode %d\n", | |
339 | fid, name, perm, mode); | |
340 | ||
16cce6d2 LI |
341 | tc = v9fs_create_tcreate(fid, name, perm, mode, extension, |
342 | v9ses->extended); | |
343 | ||
531b1094 LI |
344 | if (!IS_ERR(tc)) { |
345 | ret = v9fs_mux_rpc(v9ses->mux, tc, rcp); | |
346 | kfree(tc); | |
347 | } else | |
348 | ret = PTR_ERR(tc); | |
b8cf945b | 349 | |
531b1094 | 350 | return ret; |
b8cf945b EVH |
351 | } |
352 | ||
353 | /** | |
354 | * v9fs_t_read - read data | |
355 | * @v9ses: 9P2000 session information | |
356 | * @fid: fid to read from | |
357 | * @offset: offset to start read at | |
358 | * @count: how many bytes to read | |
359 | * @fcall: pointer to response fcall (with data) | |
360 | * | |
361 | */ | |
362 | ||
363 | int | |
364 | v9fs_t_read(struct v9fs_session_info *v9ses, u32 fid, u64 offset, | |
531b1094 | 365 | u32 count, struct v9fs_fcall **rcp) |
b8cf945b | 366 | { |
531b1094 LI |
367 | int ret; |
368 | struct v9fs_fcall *tc, *rc; | |
b8cf945b | 369 | |
531b1094 LI |
370 | dprintk(DEBUG_9P, "fid %d offset 0x%llux count 0x%x\n", fid, |
371 | (long long unsigned) offset, count); | |
372 | ||
531b1094 LI |
373 | tc = v9fs_create_tread(fid, offset, count); |
374 | if (!IS_ERR(tc)) { | |
375 | ret = v9fs_mux_rpc(v9ses->mux, tc, &rc); | |
376 | if (!ret) | |
377 | ret = rc->params.rread.count; | |
378 | if (rcp) | |
379 | *rcp = rc; | |
380 | else | |
381 | kfree(rc); | |
382 | ||
383 | kfree(tc); | |
384 | } else | |
385 | ret = PTR_ERR(tc); | |
386 | ||
387 | return ret; | |
b8cf945b EVH |
388 | } |
389 | ||
390 | /** | |
391 | * v9fs_t_write - write data | |
392 | * @v9ses: 9P2000 session information | |
393 | * @fid: fid to write to | |
394 | * @offset: offset to start write at | |
395 | * @count: how many bytes to write | |
396 | * @fcall: pointer to response fcall | |
397 | * | |
398 | */ | |
399 | ||
400 | int | |
531b1094 LI |
401 | v9fs_t_write(struct v9fs_session_info *v9ses, u32 fid, u64 offset, u32 count, |
402 | const char __user *data, struct v9fs_fcall **rcp) | |
b8cf945b | 403 | { |
531b1094 LI |
404 | int ret; |
405 | struct v9fs_fcall *tc, *rc; | |
b8cf945b | 406 | |
531b1094 LI |
407 | dprintk(DEBUG_9P, "fid %d offset 0x%llux count 0x%x\n", fid, |
408 | (long long unsigned) offset, count); | |
b8cf945b | 409 | |
531b1094 LI |
410 | tc = v9fs_create_twrite(fid, offset, count, data); |
411 | if (!IS_ERR(tc)) { | |
412 | ret = v9fs_mux_rpc(v9ses->mux, tc, &rc); | |
b8cf945b | 413 | |
531b1094 LI |
414 | if (!ret) |
415 | ret = rc->params.rwrite.count; | |
416 | if (rcp) | |
417 | *rcp = rc; | |
418 | else | |
419 | kfree(rc); | |
b8cf945b | 420 | |
531b1094 LI |
421 | kfree(tc); |
422 | } else | |
423 | ret = PTR_ERR(tc); | |
b8cf945b | 424 | |
531b1094 | 425 | return ret; |
b8cf945b | 426 | } |
531b1094 | 427 |