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[PATCH] md: add write-intent-bitmap support to raid5
[linux-2.6/verdex.git] / fs / 9p / conv.c
blob1554731bd65350b2c7476992f096026a53d93b81
1 /*
2 * linux/fs/9p/conv.c
3 *
4 * 9P protocol conversion 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 "conv.h"
37
38 /*
39 * Buffer to help with string parsing
40 */
41 struct cbuf {
42 unsigned char *sp;
43 unsigned char *p;
44 unsigned char *ep;
45 };
46
47 static inline void buf_init(struct cbuf *buf, void *data, int datalen)
48 {
49 buf->sp = buf->p = data;
50 buf->ep = data + datalen;
51 }
52
53 static inline int buf_check_overflow(struct cbuf *buf)
54 {
55 return buf->p > buf->ep;
56 }
57
58 static inline void buf_check_size(struct cbuf *buf, int len)
59 {
60 if (buf->p+len > buf->ep) {
61 if (buf->p < buf->ep) {
62 eprintk(KERN_ERR, "buffer overflow\n");
63 buf->p = buf->ep + 1;
64 }
65 }
66 }
67
68 static inline void *buf_alloc(struct cbuf *buf, int len)
69 {
70 void *ret = NULL;
71
72 buf_check_size(buf, len);
73 ret = buf->p;
74 buf->p += len;
75
76 return ret;
77 }
78
79 static inline void buf_put_int8(struct cbuf *buf, u8 val)
80 {
81 buf_check_size(buf, 1);
82
83 buf->p[0] = val;
84 buf->p++;
85 }
86
87 static inline void buf_put_int16(struct cbuf *buf, u16 val)
88 {
89 buf_check_size(buf, 2);
90
91 *(__le16 *) buf->p = cpu_to_le16(val);
92 buf->p += 2;
93 }
94
95 static inline void buf_put_int32(struct cbuf *buf, u32 val)
96 {
97 buf_check_size(buf, 4);
98
99 *(__le32 *)buf->p = cpu_to_le32(val);
100 buf->p += 4;
101 }
102
103 static inline void buf_put_int64(struct cbuf *buf, u64 val)
104 {
105 buf_check_size(buf, 8);
106
107 *(__le64 *)buf->p = cpu_to_le64(val);
108 buf->p += 8;
109 }
110
111 static inline void buf_put_stringn(struct cbuf *buf, const char *s, u16 slen)
112 {
113 buf_check_size(buf, slen + 2);
114
115 buf_put_int16(buf, slen);
116 memcpy(buf->p, s, slen);
117 buf->p += slen;
118 }
119
120 static inline void buf_put_string(struct cbuf *buf, const char *s)
121 {
122 buf_put_stringn(buf, s, strlen(s));
123 }
124
125 static inline void buf_put_data(struct cbuf *buf, void *data, u32 datalen)
126 {
127 buf_check_size(buf, datalen);
128
129 memcpy(buf->p, data, datalen);
130 buf->p += datalen;
131 }
132
133 static inline u8 buf_get_int8(struct cbuf *buf)
134 {
135 u8 ret = 0;
136
137 buf_check_size(buf, 1);
138 ret = buf->p[0];
139
140 buf->p++;
141
142 return ret;
143 }
144
145 static inline u16 buf_get_int16(struct cbuf *buf)
146 {
147 u16 ret = 0;
148
149 buf_check_size(buf, 2);
150 ret = le16_to_cpu(*(__le16 *)buf->p);
151
152 buf->p += 2;
153
154 return ret;
155 }
156
157 static inline u32 buf_get_int32(struct cbuf *buf)
158 {
159 u32 ret = 0;
160
161 buf_check_size(buf, 4);
162 ret = le32_to_cpu(*(__le32 *)buf->p);
163
164 buf->p += 4;
165
166 return ret;
167 }
168
169 static inline u64 buf_get_int64(struct cbuf *buf)
170 {
171 u64 ret = 0;
172
173 buf_check_size(buf, 8);
174 ret = le64_to_cpu(*(__le64 *)buf->p);
175
176 buf->p += 8;
177
178 return ret;
179 }
180
181 static inline int
182 buf_get_string(struct cbuf *buf, char *data, unsigned int datalen)
183 {
184
185 u16 len = buf_get_int16(buf);
186 buf_check_size(buf, len);
187 if (len + 1 > datalen)
188 return 0;
189
190 memcpy(data, buf->p, len);
191 data[len] = 0;
192 buf->p += len;
193
194 return len + 1;
195 }
196
197 static inline char *buf_get_stringb(struct cbuf *buf, struct cbuf *sbuf)
198 {
199 char *ret = NULL;
200 int n = buf_get_string(buf, sbuf->p, sbuf->ep - sbuf->p);
201
202 if (n > 0) {
203 ret = sbuf->p;
204 sbuf->p += n;
205 }
206
207 return ret;
208 }
209
210 static inline int buf_get_data(struct cbuf *buf, void *data, int datalen)
211 {
212 buf_check_size(buf, datalen);
213
214 memcpy(data, buf->p, datalen);
215 buf->p += datalen;
216
217 return datalen;
218 }
219
220 static inline void *buf_get_datab(struct cbuf *buf, struct cbuf *dbuf,
221 int datalen)
222 {
223 char *ret = NULL;
224 int n = 0;
225
226 buf_check_size(dbuf, datalen);
227
228 n = buf_get_data(buf, dbuf->p, datalen);
229
230 if (n > 0) {
231 ret = dbuf->p;
232 dbuf->p += n;
233 }
234
235 return ret;
236 }
237
238 /**
239 * v9fs_size_stat - calculate the size of a variable length stat struct
240 * @v9ses: session information
241 * @stat: metadata (stat) structure
242 *
243 */
244
245 static int v9fs_size_stat(struct v9fs_session_info *v9ses,
246 struct v9fs_stat *stat)
247 {
248 int size = 0;
249
250 if (stat == NULL) {
251 eprintk(KERN_ERR, "v9fs_size_stat: got a NULL stat pointer\n");
252 return 0;
253 }
254
255 size = /* 2 + *//* size[2] */
256 2 + /* type[2] */
257 4 + /* dev[4] */
258 1 + /* qid.type[1] */
259 4 + /* qid.vers[4] */
260 8 + /* qid.path[8] */
261 4 + /* mode[4] */
262 4 + /* atime[4] */
263 4 + /* mtime[4] */
264 8 + /* length[8] */
265 8; /* minimum sum of string lengths */
266
267 if (stat->name)
268 size += strlen(stat->name);
269 if (stat->uid)
270 size += strlen(stat->uid);
271 if (stat->gid)
272 size += strlen(stat->gid);
273 if (stat->muid)
274 size += strlen(stat->muid);
275
276 if (v9ses->extended) {
277 size += 4 + /* n_uid[4] */
278 4 + /* n_gid[4] */
279 4 + /* n_muid[4] */
280 2; /* string length of extension[4] */
281 if (stat->extension)
282 size += strlen(stat->extension);
283 }
284
285 return size;
286 }
287
288 /**
289 * serialize_stat - safely format a stat structure for transmission
290 * @v9ses: session info
291 * @stat: metadata (stat) structure
292 * @bufp: buffer to serialize structure into
293 *
294 */
295
296 static int
297 serialize_stat(struct v9fs_session_info *v9ses, struct v9fs_stat *stat,
298 struct cbuf *bufp)
299 {
300 buf_put_int16(bufp, stat->size);
301 buf_put_int16(bufp, stat->type);
302 buf_put_int32(bufp, stat->dev);
303 buf_put_int8(bufp, stat->qid.type);
304 buf_put_int32(bufp, stat->qid.version);
305 buf_put_int64(bufp, stat->qid.path);
306 buf_put_int32(bufp, stat->mode);
307 buf_put_int32(bufp, stat->atime);
308 buf_put_int32(bufp, stat->mtime);
309 buf_put_int64(bufp, stat->length);
310
311 buf_put_string(bufp, stat->name);
312 buf_put_string(bufp, stat->uid);
313 buf_put_string(bufp, stat->gid);
314 buf_put_string(bufp, stat->muid);
315
316 if (v9ses->extended) {
317 buf_put_string(bufp, stat->extension);
318 buf_put_int32(bufp, stat->n_uid);
319 buf_put_int32(bufp, stat->n_gid);
320 buf_put_int32(bufp, stat->n_muid);
321 }
322
323 if (buf_check_overflow(bufp))
324 return 0;
325
326 return stat->size;
327 }
328
329 /**
330 * deserialize_stat - safely decode a recieved metadata (stat) structure
331 * @v9ses: session info
332 * @bufp: buffer to deserialize
333 * @stat: metadata (stat) structure
334 * @dbufp: buffer to deserialize variable strings into
335 *
336 */
337
338 static inline int
339 deserialize_stat(struct v9fs_session_info *v9ses, struct cbuf *bufp,
340 struct v9fs_stat *stat, struct cbuf *dbufp)
341 {
342
343 stat->size = buf_get_int16(bufp);
344 stat->type = buf_get_int16(bufp);
345 stat->dev = buf_get_int32(bufp);
346 stat->qid.type = buf_get_int8(bufp);
347 stat->qid.version = buf_get_int32(bufp);
348 stat->qid.path = buf_get_int64(bufp);
349 stat->mode = buf_get_int32(bufp);
350 stat->atime = buf_get_int32(bufp);
351 stat->mtime = buf_get_int32(bufp);
352 stat->length = buf_get_int64(bufp);
353 stat->name = buf_get_stringb(bufp, dbufp);
354 stat->uid = buf_get_stringb(bufp, dbufp);
355 stat->gid = buf_get_stringb(bufp, dbufp);
356 stat->muid = buf_get_stringb(bufp, dbufp);
357
358 if (v9ses->extended) {
359 stat->extension = buf_get_stringb(bufp, dbufp);
360 stat->n_uid = buf_get_int32(bufp);
361 stat->n_gid = buf_get_int32(bufp);
362 stat->n_muid = buf_get_int32(bufp);
363 }
364
365 if (buf_check_overflow(bufp) || buf_check_overflow(dbufp))
366 return 0;
367
368 return stat->size + 2;
369 }
370
371 /**
372 * deserialize_statb - wrapper for decoding a received metadata structure
373 * @v9ses: session info
374 * @bufp: buffer to deserialize
375 * @dbufp: buffer to deserialize variable strings into
376 *
377 */
378
379 static inline struct v9fs_stat *deserialize_statb(struct v9fs_session_info
380 *v9ses, struct cbuf *bufp,
381 struct cbuf *dbufp)
382 {
383 struct v9fs_stat *ret = buf_alloc(dbufp, sizeof(struct v9fs_stat));
384
385 if (ret) {
386 int n = deserialize_stat(v9ses, bufp, ret, dbufp);
387 if (n <= 0)
388 return NULL;
389 }
390
391 return ret;
392 }
393
394 /**
395 * v9fs_deserialize_stat - decode a received metadata structure
396 * @v9ses: session info
397 * @buf: buffer to deserialize
398 * @buflen: length of received buffer
399 * @stat: metadata structure to decode into
400 * @statlen: length of destination metadata structure
401 *
402 */
403
404 int
405 v9fs_deserialize_stat(struct v9fs_session_info *v9ses, void *buf,
406 u32 buflen, struct v9fs_stat *stat, u32 statlen)
407 {
408 struct cbuf buffer;
409 struct cbuf *bufp = &buffer;
410 struct cbuf dbuffer;
411 struct cbuf *dbufp = &dbuffer;
412
413 buf_init(bufp, buf, buflen);
414 buf_init(dbufp, (char *)stat + sizeof(struct v9fs_stat),
415 statlen - sizeof(struct v9fs_stat));
416
417 return deserialize_stat(v9ses, bufp, stat, dbufp);
418 }
419
420 static inline int
421 v9fs_size_fcall(struct v9fs_session_info *v9ses, struct v9fs_fcall *fcall)
422 {
423 int size = 4 + 1 + 2; /* size[4] msg[1] tag[2] */
424 int i = 0;
425
426 switch (fcall->id) {
427 default:
428 eprintk(KERN_ERR, "bad msg type %d\n", fcall->id);
429 return 0;
430 case TVERSION: /* msize[4] version[s] */
431 size += 4 + 2 + strlen(fcall->params.tversion.version);
432 break;
433 case TAUTH: /* afid[4] uname[s] aname[s] */
434 size += 4 + 2 + strlen(fcall->params.tauth.uname) +
435 2 + strlen(fcall->params.tauth.aname);
436 break;
437 case TFLUSH: /* oldtag[2] */
438 size += 2;
439 break;
440 case TATTACH: /* fid[4] afid[4] uname[s] aname[s] */
441 size += 4 + 4 + 2 + strlen(fcall->params.tattach.uname) +
442 2 + strlen(fcall->params.tattach.aname);
443 break;
444 case TWALK: /* fid[4] newfid[4] nwname[2] nwname*(wname[s]) */
445 size += 4 + 4 + 2;
446 /* now compute total for the array of names */
447 for (i = 0; i < fcall->params.twalk.nwname; i++)
448 size += 2 + strlen(fcall->params.twalk.wnames[i]);
449 break;
450 case TOPEN: /* fid[4] mode[1] */
451 size += 4 + 1;
452 break;
453 case TCREATE: /* fid[4] name[s] perm[4] mode[1] */
454 size += 4 + 2 + strlen(fcall->params.tcreate.name) + 4 + 1;
455 break;
456 case TREAD: /* fid[4] offset[8] count[4] */
457 size += 4 + 8 + 4;
458 break;
459 case TWRITE: /* fid[4] offset[8] count[4] data[count] */
460 size += 4 + 8 + 4 + fcall->params.twrite.count;
461 break;
462 case TCLUNK: /* fid[4] */
463 size += 4;
464 break;
465 case TREMOVE: /* fid[4] */
466 size += 4;
467 break;
468 case TSTAT: /* fid[4] */
469 size += 4;
470 break;
471 case TWSTAT: /* fid[4] stat[n] */
472 fcall->params.twstat.stat->size =
473 v9fs_size_stat(v9ses, fcall->params.twstat.stat);
474 size += 4 + 2 + 2 + fcall->params.twstat.stat->size;
475 }
476 return size;
477 }
478
479 /*
480 * v9fs_serialize_fcall - marshall fcall struct into a packet
481 * @v9ses: session information
482 * @fcall: structure to convert
483 * @data: buffer to serialize fcall into
484 * @datalen: length of buffer to serialize fcall into
485 *
486 */
487
488 int
489 v9fs_serialize_fcall(struct v9fs_session_info *v9ses, struct v9fs_fcall *fcall,
490 void *data, u32 datalen)
491 {
492 int i = 0;
493 struct v9fs_stat *stat = NULL;
494 struct cbuf buffer;
495 struct cbuf *bufp = &buffer;
496
497 buf_init(bufp, data, datalen);
498
499 if (!fcall) {
500 eprintk(KERN_ERR, "no fcall\n");
501 return -EINVAL;
502 }
503
504 fcall->size = v9fs_size_fcall(v9ses, fcall);
505
506 buf_put_int32(bufp, fcall->size);
507 buf_put_int8(bufp, fcall->id);
508 buf_put_int16(bufp, fcall->tag);
509
510 dprintk(DEBUG_CONV, "size %d id %d tag %d\n", fcall->size, fcall->id,
511 fcall->tag);
512
513 /* now encode it */
514 switch (fcall->id) {
515 default:
516 eprintk(KERN_ERR, "bad msg type: %d\n", fcall->id);
517 return -EPROTO;
518 case TVERSION:
519 buf_put_int32(bufp, fcall->params.tversion.msize);
520 buf_put_string(bufp, fcall->params.tversion.version);
521 break;
522 case TAUTH:
523 buf_put_int32(bufp, fcall->params.tauth.afid);
524 buf_put_string(bufp, fcall->params.tauth.uname);
525 buf_put_string(bufp, fcall->params.tauth.aname);
526 break;
527 case TFLUSH:
528 buf_put_int16(bufp, fcall->params.tflush.oldtag);
529 break;
530 case TATTACH:
531 buf_put_int32(bufp, fcall->params.tattach.fid);
532 buf_put_int32(bufp, fcall->params.tattach.afid);
533 buf_put_string(bufp, fcall->params.tattach.uname);
534 buf_put_string(bufp, fcall->params.tattach.aname);
535 break;
536 case TWALK:
537 buf_put_int32(bufp, fcall->params.twalk.fid);
538 buf_put_int32(bufp, fcall->params.twalk.newfid);
539 buf_put_int16(bufp, fcall->params.twalk.nwname);
540 for (i = 0; i < fcall->params.twalk.nwname; i++)
541 buf_put_string(bufp, fcall->params.twalk.wnames[i]);
542 break;
543 case TOPEN:
544 buf_put_int32(bufp, fcall->params.topen.fid);
545 buf_put_int8(bufp, fcall->params.topen.mode);
546 break;
547 case TCREATE:
548 buf_put_int32(bufp, fcall->params.tcreate.fid);
549 buf_put_string(bufp, fcall->params.tcreate.name);
550 buf_put_int32(bufp, fcall->params.tcreate.perm);
551 buf_put_int8(bufp, fcall->params.tcreate.mode);
552 break;
553 case TREAD:
554 buf_put_int32(bufp, fcall->params.tread.fid);
555 buf_put_int64(bufp, fcall->params.tread.offset);
556 buf_put_int32(bufp, fcall->params.tread.count);
557 break;
558 case TWRITE:
559 buf_put_int32(bufp, fcall->params.twrite.fid);
560 buf_put_int64(bufp, fcall->params.twrite.offset);
561 buf_put_int32(bufp, fcall->params.twrite.count);
562 buf_put_data(bufp, fcall->params.twrite.data,
563 fcall->params.twrite.count);
564 break;
565 case TCLUNK:
566 buf_put_int32(bufp, fcall->params.tclunk.fid);
567 break;
568 case TREMOVE:
569 buf_put_int32(bufp, fcall->params.tremove.fid);
570 break;
571 case TSTAT:
572 buf_put_int32(bufp, fcall->params.tstat.fid);
573 break;
574 case TWSTAT:
575 buf_put_int32(bufp, fcall->params.twstat.fid);
576 stat = fcall->params.twstat.stat;
577
578 buf_put_int16(bufp, stat->size + 2);
579 serialize_stat(v9ses, stat, bufp);
580 break;
581 }
582
583 if (buf_check_overflow(bufp))
584 return -EIO;
585
586 return fcall->size;
587 }
588
589 /**
590 * deserialize_fcall - unmarshal a response
591 * @v9ses: session information
592 * @msgsize: size of rcall message
593 * @buf: recieved buffer
594 * @buflen: length of received buffer
595 * @rcall: fcall structure to populate
596 * @rcalllen: length of fcall structure to populate
597 *
598 */
599
600 int
601 v9fs_deserialize_fcall(struct v9fs_session_info *v9ses, u32 msgsize,
602 void *buf, u32 buflen, struct v9fs_fcall *rcall,
603 int rcalllen)
604 {
605
606 struct cbuf buffer;
607 struct cbuf *bufp = &buffer;
608 struct cbuf dbuffer;
609 struct cbuf *dbufp = &dbuffer;
610 int i = 0;
611
612 buf_init(bufp, buf, buflen);
613 buf_init(dbufp, (char *)rcall + sizeof(struct v9fs_fcall),
614 rcalllen - sizeof(struct v9fs_fcall));
615
616 rcall->size = msgsize;
617 rcall->id = buf_get_int8(bufp);
618 rcall->tag = buf_get_int16(bufp);
619
620 dprintk(DEBUG_CONV, "size %d id %d tag %d\n", rcall->size, rcall->id,
621 rcall->tag);
622 switch (rcall->id) {
623 default:
624 eprintk(KERN_ERR, "unknown message type: %d\n", rcall->id);
625 return -EPROTO;
626 case RVERSION:
627 rcall->params.rversion.msize = buf_get_int32(bufp);
628 rcall->params.rversion.version = buf_get_stringb(bufp, dbufp);
629 break;
630 case RFLUSH:
631 break;
632 case RATTACH:
633 rcall->params.rattach.qid.type = buf_get_int8(bufp);
634 rcall->params.rattach.qid.version = buf_get_int32(bufp);
635 rcall->params.rattach.qid.path = buf_get_int64(bufp);
636 break;
637 case RWALK:
638 rcall->params.rwalk.nwqid = buf_get_int16(bufp);
639 rcall->params.rwalk.wqids = buf_alloc(bufp,
640 rcall->params.rwalk.nwqid * sizeof(struct v9fs_qid));
641 if (rcall->params.rwalk.wqids)
642 for (i = 0; i < rcall->params.rwalk.nwqid; i++) {
643 rcall->params.rwalk.wqids[i].type =
644 buf_get_int8(bufp);
645 rcall->params.rwalk.wqids[i].version =
646 buf_get_int16(bufp);
647 rcall->params.rwalk.wqids[i].path =
648 buf_get_int64(bufp);
649 }
650 break;
651 case ROPEN:
652 rcall->params.ropen.qid.type = buf_get_int8(bufp);
653 rcall->params.ropen.qid.version = buf_get_int32(bufp);
654 rcall->params.ropen.qid.path = buf_get_int64(bufp);
655 rcall->params.ropen.iounit = buf_get_int32(bufp);
656 break;
657 case RCREATE:
658 rcall->params.rcreate.qid.type = buf_get_int8(bufp);
659 rcall->params.rcreate.qid.version = buf_get_int32(bufp);
660 rcall->params.rcreate.qid.path = buf_get_int64(bufp);
661 rcall->params.rcreate.iounit = buf_get_int32(bufp);
662 break;
663 case RREAD:
664 rcall->params.rread.count = buf_get_int32(bufp);
665 rcall->params.rread.data = buf_get_datab(bufp, dbufp,
666 rcall->params.rread.count);
667 break;
668 case RWRITE:
669 rcall->params.rwrite.count = buf_get_int32(bufp);
670 break;
671 case RCLUNK:
672 break;
673 case RREMOVE:
674 break;
675 case RSTAT:
676 buf_get_int16(bufp);
677 rcall->params.rstat.stat =
678 deserialize_statb(v9ses, bufp, dbufp);
679 break;
680 case RWSTAT:
681 break;
682 case RERROR:
683 rcall->params.rerror.error = buf_get_stringb(bufp, dbufp);
684 if (v9ses->extended)
685 rcall->params.rerror.errno = buf_get_int16(bufp);
686 break;
687 }
688
689 if (buf_check_overflow(bufp) || buf_check_overflow(dbufp))
690 return -EIO;
691
692 return rcall->size;
693 }
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