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1 | /* |
2 | * linux/fs/9p/9p.c | |
3 | * | |
4 | * This file contains functions 9P2000 functions | |
5 | * | |
6 | * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> | |
7 | * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
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 | ||
27 | #include <linux/config.h> | |
28 | #include <linux/module.h> | |
29 | #include <linux/errno.h> | |
30 | #include <linux/fs.h> | |
31 | #include <linux/idr.h> | |
32 | ||
33 | #include "debug.h" | |
34 | #include "v9fs.h" | |
35 | #include "9p.h" | |
36 | #include "mux.h" | |
37 | ||
38 | /** | |
39 | * v9fs_t_version - negotiate protocol parameters with sever | |
40 | * @v9ses: 9P2000 session information | |
41 | * @msize: requested max size packet | |
42 | * @version: requested version.extension string | |
43 | * @fcall: pointer to response fcall pointer | |
44 | * | |
45 | */ | |
46 | ||
47 | int | |
48 | v9fs_t_version(struct v9fs_session_info *v9ses, u32 msize, | |
49 | char *version, struct v9fs_fcall **fcall) | |
50 | { | |
51 | struct v9fs_fcall msg; | |
52 | ||
53 | dprintk(DEBUG_9P, "msize: %d version: %s\n", msize, version); | |
54 | msg.id = TVERSION; | |
55 | msg.params.tversion.msize = msize; | |
56 | msg.params.tversion.version = version; | |
57 | ||
58 | return v9fs_mux_rpc(v9ses, &msg, fcall); | |
59 | } | |
60 | ||
61 | /** | |
62 | * v9fs_t_attach - mount the server | |
63 | * @v9ses: 9P2000 session information | |
64 | * @uname: user name doing the attach | |
65 | * @aname: remote name being attached to | |
66 | * @fid: mount fid to attatch to root node | |
67 | * @afid: authentication fid (in this case result key) | |
68 | * @fcall: pointer to response fcall pointer | |
69 | * | |
70 | */ | |
71 | ||
72 | int | |
73 | v9fs_t_attach(struct v9fs_session_info *v9ses, char *uname, char *aname, | |
74 | u32 fid, u32 afid, struct v9fs_fcall **fcall) | |
75 | { | |
76 | struct v9fs_fcall msg; | |
77 | ||
78 | dprintk(DEBUG_9P, "uname '%s' aname '%s' fid %d afid %d\n", uname, | |
79 | aname, fid, afid); | |
80 | msg.id = TATTACH; | |
81 | msg.params.tattach.fid = fid; | |
82 | msg.params.tattach.afid = afid; | |
83 | msg.params.tattach.uname = uname; | |
84 | msg.params.tattach.aname = aname; | |
85 | ||
86 | return v9fs_mux_rpc(v9ses, &msg, fcall); | |
87 | } | |
88 | ||
89 | /** | |
90 | * v9fs_t_clunk - release a fid (finish a transaction) | |
91 | * @v9ses: 9P2000 session information | |
92 | * @fid: fid to release | |
93 | * @fcall: pointer to response fcall pointer | |
94 | * | |
95 | */ | |
96 | ||
97 | int | |
98 | v9fs_t_clunk(struct v9fs_session_info *v9ses, u32 fid, | |
99 | struct v9fs_fcall **fcall) | |
100 | { | |
101 | struct v9fs_fcall msg; | |
102 | ||
103 | dprintk(DEBUG_9P, "fid %d\n", fid); | |
104 | msg.id = TCLUNK; | |
105 | msg.params.tclunk.fid = fid; | |
106 | ||
107 | return v9fs_mux_rpc(v9ses, &msg, fcall); | |
108 | } | |
109 | ||
110 | /** | |
111 | * v9fs_v9fs_t_flush - flush a pending transaction | |
112 | * @v9ses: 9P2000 session information | |
113 | * @tag: tid to release | |
114 | * | |
115 | */ | |
116 | ||
117 | int v9fs_t_flush(struct v9fs_session_info *v9ses, u16 tag) | |
118 | { | |
119 | struct v9fs_fcall msg; | |
120 | ||
121 | dprintk(DEBUG_9P, "oldtag %d\n", tag); | |
122 | msg.id = TFLUSH; | |
123 | msg.params.tflush.oldtag = tag; | |
124 | return v9fs_mux_rpc(v9ses, &msg, NULL); | |
125 | } | |
126 | ||
127 | /** | |
128 | * v9fs_t_stat - read a file's meta-data | |
129 | * @v9ses: 9P2000 session information | |
130 | * @fid: fid pointing to file or directory to get info about | |
131 | * @fcall: pointer to response fcall | |
132 | * | |
133 | */ | |
134 | ||
135 | int | |
136 | v9fs_t_stat(struct v9fs_session_info *v9ses, u32 fid, struct v9fs_fcall **fcall) | |
137 | { | |
138 | struct v9fs_fcall msg; | |
139 | ||
140 | dprintk(DEBUG_9P, "fid %d\n", fid); | |
141 | if (fcall) | |
142 | *fcall = NULL; | |
143 | ||
144 | msg.id = TSTAT; | |
145 | msg.params.tstat.fid = fid; | |
146 | return v9fs_mux_rpc(v9ses, &msg, fcall); | |
147 | } | |
148 | ||
149 | /** | |
150 | * v9fs_t_wstat - write a file's meta-data | |
151 | * @v9ses: 9P2000 session information | |
152 | * @fid: fid pointing to file or directory to write info about | |
153 | * @stat: metadata | |
154 | * @fcall: pointer to response fcall | |
155 | * | |
156 | */ | |
157 | ||
158 | int | |
159 | v9fs_t_wstat(struct v9fs_session_info *v9ses, u32 fid, | |
160 | struct v9fs_stat *stat, struct v9fs_fcall **fcall) | |
161 | { | |
162 | struct v9fs_fcall msg; | |
163 | ||
164 | dprintk(DEBUG_9P, "fid %d length %d\n", fid, (int)stat->length); | |
165 | msg.id = TWSTAT; | |
166 | msg.params.twstat.fid = fid; | |
167 | msg.params.twstat.stat = stat; | |
168 | ||
169 | return v9fs_mux_rpc(v9ses, &msg, fcall); | |
170 | } | |
171 | ||
172 | /** | |
173 | * v9fs_t_walk - walk a fid to a new file or directory | |
174 | * @v9ses: 9P2000 session information | |
175 | * @fid: fid to walk | |
176 | * @newfid: new fid (for clone operations) | |
177 | * @name: path to walk fid to | |
178 | * @fcall: pointer to response fcall | |
179 | * | |
180 | */ | |
181 | ||
182 | /* TODO: support multiple walk */ | |
183 | ||
184 | int | |
185 | v9fs_t_walk(struct v9fs_session_info *v9ses, u32 fid, u32 newfid, | |
186 | char *name, struct v9fs_fcall **fcall) | |
187 | { | |
188 | struct v9fs_fcall msg; | |
189 | ||
190 | dprintk(DEBUG_9P, "fid %d newfid %d wname '%s'\n", fid, newfid, name); | |
191 | msg.id = TWALK; | |
192 | msg.params.twalk.fid = fid; | |
193 | msg.params.twalk.newfid = newfid; | |
194 | ||
195 | if (name) { | |
196 | msg.params.twalk.nwname = 1; | |
197 | msg.params.twalk.wnames = &name; | |
198 | } else { | |
199 | msg.params.twalk.nwname = 0; | |
200 | } | |
201 | ||
202 | return v9fs_mux_rpc(v9ses, &msg, fcall); | |
203 | } | |
204 | ||
205 | /** | |
206 | * v9fs_t_open - open a file | |
207 | * | |
208 | * @v9ses - 9P2000 session information | |
209 | * @fid - fid to open | |
210 | * @mode - mode to open file (R, RW, etc) | |
211 | * @fcall - pointer to response fcall | |
212 | * | |
213 | */ | |
214 | ||
215 | int | |
216 | v9fs_t_open(struct v9fs_session_info *v9ses, u32 fid, u8 mode, | |
217 | struct v9fs_fcall **fcall) | |
218 | { | |
219 | struct v9fs_fcall msg; | |
220 | long errorno = -1; | |
221 | ||
222 | dprintk(DEBUG_9P, "fid %d mode %d\n", fid, mode); | |
223 | msg.id = TOPEN; | |
224 | msg.params.topen.fid = fid; | |
225 | msg.params.topen.mode = mode; | |
226 | ||
227 | errorno = v9fs_mux_rpc(v9ses, &msg, fcall); | |
228 | ||
229 | return errorno; | |
230 | } | |
231 | ||
232 | /** | |
233 | * v9fs_t_remove - remove a file or directory | |
234 | * @v9ses: 9P2000 session information | |
235 | * @fid: fid to remove | |
236 | * @fcall: pointer to response fcall | |
237 | * | |
238 | */ | |
239 | ||
240 | int | |
241 | v9fs_t_remove(struct v9fs_session_info *v9ses, u32 fid, | |
242 | struct v9fs_fcall **fcall) | |
243 | { | |
244 | struct v9fs_fcall msg; | |
245 | ||
246 | dprintk(DEBUG_9P, "fid %d\n", fid); | |
247 | msg.id = TREMOVE; | |
248 | msg.params.tremove.fid = fid; | |
249 | return v9fs_mux_rpc(v9ses, &msg, fcall); | |
250 | } | |
251 | ||
252 | /** | |
253 | * v9fs_t_create - create a file or directory | |
254 | * @v9ses: 9P2000 session information | |
255 | * @fid: fid to create | |
256 | * @name: name of the file or directory to create | |
257 | * @perm: permissions to create with | |
258 | * @mode: mode to open file (R, RW, etc) | |
259 | * @fcall: pointer to response fcall | |
260 | * | |
261 | */ | |
262 | ||
263 | int | |
264 | v9fs_t_create(struct v9fs_session_info *v9ses, u32 fid, char *name, | |
265 | u32 perm, u8 mode, struct v9fs_fcall **fcall) | |
266 | { | |
267 | struct v9fs_fcall msg; | |
268 | ||
269 | dprintk(DEBUG_9P, "fid %d name '%s' perm %x mode %d\n", | |
270 | fid, name, perm, mode); | |
271 | ||
272 | msg.id = TCREATE; | |
273 | msg.params.tcreate.fid = fid; | |
274 | msg.params.tcreate.name = name; | |
275 | msg.params.tcreate.perm = perm; | |
276 | msg.params.tcreate.mode = mode; | |
277 | ||
278 | return v9fs_mux_rpc(v9ses, &msg, fcall); | |
279 | } | |
280 | ||
281 | /** | |
282 | * v9fs_t_read - read data | |
283 | * @v9ses: 9P2000 session information | |
284 | * @fid: fid to read from | |
285 | * @offset: offset to start read at | |
286 | * @count: how many bytes to read | |
287 | * @fcall: pointer to response fcall (with data) | |
288 | * | |
289 | */ | |
290 | ||
291 | int | |
292 | v9fs_t_read(struct v9fs_session_info *v9ses, u32 fid, u64 offset, | |
293 | u32 count, struct v9fs_fcall **fcall) | |
294 | { | |
295 | struct v9fs_fcall msg; | |
296 | struct v9fs_fcall *rc = NULL; | |
297 | long errorno = -1; | |
298 | ||
299 | dprintk(DEBUG_9P, "fid %d offset 0x%lx count 0x%x\n", fid, | |
300 | (long unsigned int)offset, count); | |
301 | msg.id = TREAD; | |
302 | msg.params.tread.fid = fid; | |
303 | msg.params.tread.offset = offset; | |
304 | msg.params.tread.count = count; | |
305 | errorno = v9fs_mux_rpc(v9ses, &msg, &rc); | |
306 | ||
307 | if (!errorno) { | |
308 | errorno = rc->params.rread.count; | |
309 | dump_data(rc->params.rread.data, rc->params.rread.count); | |
310 | } | |
311 | ||
312 | if (fcall) | |
313 | *fcall = rc; | |
314 | else | |
315 | kfree(rc); | |
316 | ||
317 | return errorno; | |
318 | } | |
319 | ||
320 | /** | |
321 | * v9fs_t_write - write data | |
322 | * @v9ses: 9P2000 session information | |
323 | * @fid: fid to write to | |
324 | * @offset: offset to start write at | |
325 | * @count: how many bytes to write | |
326 | * @fcall: pointer to response fcall | |
327 | * | |
328 | */ | |
329 | ||
330 | int | |
331 | v9fs_t_write(struct v9fs_session_info *v9ses, u32 fid, | |
332 | u64 offset, u32 count, void *data, struct v9fs_fcall **fcall) | |
333 | { | |
334 | struct v9fs_fcall msg; | |
335 | struct v9fs_fcall *rc = NULL; | |
336 | long errorno = -1; | |
337 | ||
338 | dprintk(DEBUG_9P, "fid %d offset 0x%llx count 0x%x\n", fid, | |
339 | (unsigned long long)offset, count); | |
340 | dump_data(data, count); | |
341 | ||
342 | msg.id = TWRITE; | |
343 | msg.params.twrite.fid = fid; | |
344 | msg.params.twrite.offset = offset; | |
345 | msg.params.twrite.count = count; | |
346 | msg.params.twrite.data = data; | |
347 | ||
348 | errorno = v9fs_mux_rpc(v9ses, &msg, &rc); | |
349 | ||
350 | if (!errorno) | |
351 | errorno = rc->params.rwrite.count; | |
352 | ||
353 | if (fcall) | |
354 | *fcall = rc; | |
355 | else | |
356 | kfree(rc); | |
357 | ||
358 | return errorno; | |
359 | } |