summaryrefslogtreecommitdiffstats
path: root/fs/9p/9p.c
blob: e847f504a47c7e807f0fe97ad191b9164eb54320 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
/*
 *  linux/fs/9p/9p.c
 *
 *  This file contains functions 9P2000 functions
 *
 *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
 *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to:
 *  Free Software Foundation
 *  51 Franklin Street, Fifth Floor
 *  Boston, MA  02111-1301  USA
 *
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/idr.h>

#include "debug.h"
#include "v9fs.h"
#include "9p.h"
#include "mux.h"

/**
 * v9fs_t_version - negotiate protocol parameters with sever
 * @v9ses: 9P2000 session information
 * @msize: requested max size packet
 * @version: requested version.extension string
 * @fcall: pointer to response fcall pointer
 *
 */

int
v9fs_t_version(struct v9fs_session_info *v9ses, u32 msize,
	       char *version, struct v9fs_fcall **fcall)
{
	struct v9fs_fcall msg;

	dprintk(DEBUG_9P, "msize: %d version: %s\n", msize, version);
	msg.id = TVERSION;
	msg.params.tversion.msize = msize;
	msg.params.tversion.version = version;

	return v9fs_mux_rpc(v9ses, &msg, fcall);
}

/**
 * v9fs_t_attach - mount the server
 * @v9ses: 9P2000 session information
 * @uname: user name doing the attach
 * @aname: remote name being attached to
 * @fid: mount fid to attatch to root node
 * @afid: authentication fid (in this case result key)
 * @fcall: pointer to response fcall pointer
 *
 */

int
v9fs_t_attach(struct v9fs_session_info *v9ses, char *uname, char *aname,
	      u32 fid, u32 afid, struct v9fs_fcall **fcall)
{
	struct v9fs_fcall msg;

	dprintk(DEBUG_9P, "uname '%s' aname '%s' fid %d afid %d\n", uname,
		aname, fid, afid);
	msg.id = TATTACH;
	msg.params.tattach.fid = fid;
	msg.params.tattach.afid = afid;
	msg.params.tattach.uname = uname;
	msg.params.tattach.aname = aname;

	return v9fs_mux_rpc(v9ses, &msg, fcall);
}

/**
 * v9fs_t_clunk - release a fid (finish a transaction)
 * @v9ses: 9P2000 session information
 * @fid: fid to release
 * @fcall: pointer to response fcall pointer
 *
 */

int
v9fs_t_clunk(struct v9fs_session_info *v9ses, u32 fid,
	     struct v9fs_fcall **fcall)
{
	struct v9fs_fcall msg;

	dprintk(DEBUG_9P, "fid %d\n", fid);
	msg.id = TCLUNK;
	msg.params.tclunk.fid = fid;

	return v9fs_mux_rpc(v9ses, &msg, fcall);
}

/**
 * v9fs_v9fs_t_flush - flush a pending transaction
 * @v9ses: 9P2000 session information
 * @tag: tid to release
 *
 */

int v9fs_t_flush(struct v9fs_session_info *v9ses, u16 tag)
{
	struct v9fs_fcall msg;

	dprintk(DEBUG_9P, "oldtag %d\n", tag);
	msg.id = TFLUSH;
	msg.params.tflush.oldtag = tag;
	return v9fs_mux_rpc(v9ses, &msg, NULL);
}

/**
 * v9fs_t_stat - read a file's meta-data
 * @v9ses: 9P2000 session information
 * @fid: fid pointing to file or directory to get info about
 * @fcall: pointer to response fcall
 *
 */

int
v9fs_t_stat(struct v9fs_session_info *v9ses, u32 fid, struct v9fs_fcall **fcall)
{
	struct v9fs_fcall msg;

	dprintk(DEBUG_9P, "fid %d\n", fid);
	if (fcall)
		*fcall = NULL;

	msg.id = TSTAT;
	msg.params.tstat.fid = fid;
	return v9fs_mux_rpc(v9ses, &msg, fcall);
}

/**
 * v9fs_t_wstat - write a file's meta-data
 * @v9ses: 9P2000 session information
 * @fid: fid pointing to file or directory to write info about
 * @stat: metadata
 * @fcall: pointer to response fcall
 *
 */

int
v9fs_t_wstat(struct v9fs_session_info *v9ses, u32 fid,
	     struct v9fs_stat *stat, struct v9fs_fcall **fcall)
{
	struct v9fs_fcall msg;

	dprintk(DEBUG_9P, "fid %d length %d\n", fid, (int)stat->length);
	msg.id = TWSTAT;
	msg.params.twstat.fid = fid;
	msg.params.twstat.stat = stat;

	return v9fs_mux_rpc(v9ses, &msg, fcall);
}

/**
 * v9fs_t_walk - walk a fid to a new file or directory
 * @v9ses: 9P2000 session information
 * @fid: fid to walk
 * @newfid: new fid (for clone operations)
 * @name: path to walk fid to
 * @fcall: pointer to response fcall
 *
 */

/* TODO: support multiple walk */

int
v9fs_t_walk(struct v9fs_session_info *v9ses, u32 fid, u32 newfid,
	    char *name, struct v9fs_fcall **fcall)
{
	struct v9fs_fcall msg;

	dprintk(DEBUG_9P, "fid %d newfid %d wname '%s'\n", fid, newfid, name);
	msg.id = TWALK;
	msg.params.twalk.fid = fid;
	msg.params.twalk.newfid = newfid;

	if (name) {
		msg.params.twalk.nwname = 1;
		msg.params.twalk.wnames = &name;
	} else {
		msg.params.twalk.nwname = 0;
	}

	return v9fs_mux_rpc(v9ses, &msg, fcall);
}

/**
 * v9fs_t_open - open a file
 *
 * @v9ses - 9P2000 session information
 * @fid - fid to open
 * @mode - mode to open file (R, RW, etc)
 * @fcall - pointer to response fcall
 *
 */

int
v9fs_t_open(struct v9fs_session_info *v9ses, u32 fid, u8 mode,
	    struct v9fs_fcall **fcall)
{
	struct v9fs_fcall msg;
	long errorno = -1;

	dprintk(DEBUG_9P, "fid %d mode %d\n", fid, mode);
	msg.id = TOPEN;
	msg.params.topen.fid = fid;
	msg.params.topen.mode = mode;

	errorno = v9fs_mux_rpc(v9ses, &msg, fcall);

	return errorno;
}

/**
 * v9fs_t_remove - remove a file or directory
 * @v9ses: 9P2000 session information
 * @fid: fid to remove
 * @fcall: pointer to response fcall
 *
 */

int
v9fs_t_remove(struct v9fs_session_info *v9ses, u32 fid,
	      struct v9fs_fcall **fcall)
{
	struct v9fs_fcall msg;

	dprintk(DEBUG_9P, "fid %d\n", fid);
	msg.id = TREMOVE;
	msg.params.tremove.fid = fid;
	return v9fs_mux_rpc(v9ses, &msg, fcall);
}

/**
 * v9fs_t_create - create a file or directory
 * @v9ses: 9P2000 session information
 * @fid: fid to create
 * @name: name of the file or directory to create
 * @perm: permissions to create with
 * @mode: mode to open file (R, RW, etc)
 * @fcall: pointer to response fcall
 *
 */

int
v9fs_t_create(struct v9fs_session_info *v9ses, u32 fid, char *name,
	      u32 perm, u8 mode, struct v9fs_fcall **fcall)
{
	struct v9fs_fcall msg;

	dprintk(DEBUG_9P, "fid %d name '%s' perm %x mode %d\n",
		fid, name, perm, mode);

	msg.id = TCREATE;
	msg.params.tcreate.fid = fid;
	msg.params.tcreate.name = name;
	msg.params.tcreate.perm = perm;
	msg.params.tcreate.mode = mode;

	return v9fs_mux_rpc(v9ses, &msg, fcall);
}

/**
 * v9fs_t_read - read data
 * @v9ses: 9P2000 session information
 * @fid: fid to read from
 * @offset: offset to start read at
 * @count: how many bytes to read
 * @fcall: pointer to response fcall (with data)
 *
 */

int
v9fs_t_read(struct v9fs_session_info *v9ses, u32 fid, u64 offset,
	    u32 count, struct v9fs_fcall **fcall)
{
	struct v9fs_fcall msg;
	struct v9fs_fcall *rc = NULL;
	long errorno = -1;

	dprintk(DEBUG_9P, "fid %d offset 0x%lx count 0x%x\n", fid,
		(long unsigned int)offset, count);
	msg.id = TREAD;
	msg.params.tread.fid = fid;
	msg.params.tread.offset = offset;
	msg.params.tread.count = count;
	errorno = v9fs_mux_rpc(v9ses, &msg, &rc);

	if (!errorno) {
		errorno = rc->params.rread.count;
		dump_data(rc->params.rread.data, rc->params.rread.count);
	}

	if (fcall)
		*fcall = rc;
	else
		kfree(rc);

	return errorno;
}

/**
 * v9fs_t_write - write data
 * @v9ses: 9P2000 session information
 * @fid: fid to write to
 * @offset: offset to start write at
 * @count: how many bytes to write
 * @fcall: pointer to response fcall
 *
 */

int
v9fs_t_write(struct v9fs_session_info *v9ses, u32 fid,
	     u64 offset, u32 count, void *data, struct v9fs_fcall **fcall)
{
	struct v9fs_fcall msg;
	struct v9fs_fcall *rc = NULL;
	long errorno = -1;

	dprintk(DEBUG_9P, "fid %d offset 0x%llx count 0x%x\n", fid,
		(unsigned long long)offset, count);
	dump_data(data, count);

	msg.id = TWRITE;
	msg.params.twrite.fid = fid;
	msg.params.twrite.offset = offset;
	msg.params.twrite.count = count;
	msg.params.twrite.data = data;

	errorno = v9fs_mux_rpc(v9ses, &msg, &rc);

	if (!errorno)
		errorno = rc->params.rwrite.count;

	if (fcall)
		*fcall = rc;
	else
		kfree(rc);

	return errorno;
}
OpenPOWER on IntegriCloud