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nfs41: clear NFS4CLNT_RECALL_SLOT bit on session reset
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / nfs / callback_xdr.c
CommitLineData
1da177e4
LT		 1/*
2 * linux/fs/nfs/callback_xdr.c
3 *
4 * Copyright (C) 2004 Trond Myklebust
5 *
6 * NFSv4 callback encode/decode procedures
7 */
1da177e4
LT		 8#include <linux/kernel.h>
9#include <linux/sunrpc/svc.h>
10#include <linux/nfs4.h>
11#include <linux/nfs_fs.h>
4ce79717 12#include "nfs4_fs.h"
1da177e4
LT		 13#include "callback.h"
14
15#define CB_OP_TAGLEN_MAXSZ (512)
16#define CB_OP_HDR_RES_MAXSZ (2 + CB_OP_TAGLEN_MAXSZ)
17#define CB_OP_GETATTR_BITMAP_MAXSZ (4)
18#define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
19 CB_OP_GETATTR_BITMAP_MAXSZ + \
20 2 + 2 + 3 + 3)
21#define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
22
4aece6a1
BH		 23#if defined(CONFIG_NFS_V4_1)
24#define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
25 4 + 1 + 3)
31f09607 26#define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
b9efa1b2 27#define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
4aece6a1
BH		 28#endif /* CONFIG_NFS_V4_1 */
29
1da177e4
LT		 30#define NFSDBG_FACILITY NFSDBG_CALLBACK
31
31d2b435
AA		 32/* Internal error code */
33#define NFS4ERR_RESOURCE_HDR 11050
34
e6f684f6
AV		 35typedef __be32 (*callback_process_op_t)(void *, void *);
36typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *);
37typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *);
1da177e4
LT		 38
39
40struct callback_op {
41 callback_process_op_t process_op;
42 callback_decode_arg_t decode_args;
43 callback_encode_res_t encode_res;
44 long res_maxsize;
45};
46
47static struct callback_op callback_ops[];
48
7111c66e 49static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp)
1da177e4
LT		 50{
51 return htonl(NFS4_OK);
52}
53
5704fdeb 54static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
1da177e4
LT		 55{
56 return xdr_argsize_check(rqstp, p);
57}
58
5704fdeb 59static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
1da177e4
LT		 60{
61 return xdr_ressize_check(rqstp, p);
62}
63
5704fdeb 64static __be32 *read_buf(struct xdr_stream *xdr, int nbytes)
1da177e4 65{
5704fdeb 66 __be32 *p;
1da177e4
LT		 67
68 p = xdr_inline_decode(xdr, nbytes);
69 if (unlikely(p == NULL))
70 printk(KERN_WARNING "NFSv4 callback reply buffer overflowed!\n");
71 return p;
72}
73
e6f684f6 74static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str)
1da177e4 75{
5704fdeb 76 __be32 *p;
1da177e4
LT		 77
78 p = read_buf(xdr, 4);
79 if (unlikely(p == NULL))
80 return htonl(NFS4ERR_RESOURCE);
81 *len = ntohl(*p);
82
83 if (*len != 0) {
84 p = read_buf(xdr, *len);
85 if (unlikely(p == NULL))
86 return htonl(NFS4ERR_RESOURCE);
87 *str = (const char *)p;
88 } else
89 *str = NULL;
90
91 return 0;
92}
93
e6f684f6 94static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
1da177e4 95{
5704fdeb 96 __be32 *p;
1da177e4
LT		 97
98 p = read_buf(xdr, 4);
99 if (unlikely(p == NULL))
100 return htonl(NFS4ERR_RESOURCE);
101 fh->size = ntohl(*p);
102 if (fh->size > NFS4_FHSIZE)
103 return htonl(NFS4ERR_BADHANDLE);
104 p = read_buf(xdr, fh->size);
105 if (unlikely(p == NULL))
106 return htonl(NFS4ERR_RESOURCE);
107 memcpy(&fh->data[0], p, fh->size);
108 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
109 return 0;
110}
111
e6f684f6 112static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
1da177e4 113{
5704fdeb 114 __be32 *p;
1da177e4
LT		 115 unsigned int attrlen;
116
117 p = read_buf(xdr, 4);
118 if (unlikely(p == NULL))
119 return htonl(NFS4ERR_RESOURCE);
120 attrlen = ntohl(*p);
121 p = read_buf(xdr, attrlen << 2);
122 if (unlikely(p == NULL))
123 return htonl(NFS4ERR_RESOURCE);
124 if (likely(attrlen > 0))
125 bitmap[0] = ntohl(*p++);
126 if (attrlen > 1)
127 bitmap[1] = ntohl(*p);
128 return 0;
129}
130
e6f684f6 131static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
1da177e4 132{
5704fdeb 133 __be32 *p;
1da177e4
LT		 134
135 p = read_buf(xdr, 16);
136 if (unlikely(p == NULL))
137 return htonl(NFS4ERR_RESOURCE);
138 memcpy(stateid->data, p, 16);
139 return 0;
140}
141
e6f684f6 142static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
1da177e4 143{
5704fdeb 144 __be32 *p;
e6f684f6 145 __be32 status;
1da177e4
LT		 146
147 status = decode_string(xdr, &hdr->taglen, &hdr->tag);
148 if (unlikely(status != 0))
149 return status;
150 /* We do not like overly long tags! */
5cce428d 151 if (hdr->taglen > CB_OP_TAGLEN_MAXSZ - 12) {
1da177e4 152 printk("NFSv4 CALLBACK %s: client sent tag of length %u\n",
3110ff80 153 __func__, hdr->taglen);
1da177e4
LT		 154 return htonl(NFS4ERR_RESOURCE);
155 }
156 p = read_buf(xdr, 12);
157 if (unlikely(p == NULL))
158 return htonl(NFS4ERR_RESOURCE);
b8f2ef84 159 hdr->minorversion = ntohl(*p++);
48a9e2d2
BH		 160 /* Check minor version is zero or one. */
161 if (hdr->minorversion <= 1) {
162 p++; /* skip callback_ident */
163 } else {
b8f2ef84
BH		 164 printk(KERN_WARNING "%s: NFSv4 server callback with "
165 "illegal minor version %u!\n",
166 __func__, hdr->minorversion);
1da177e4
LT		 167 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
168 }
1da177e4 169 hdr->nops = ntohl(*p);
b8f2ef84
BH		 170 dprintk("%s: minorversion %d nops %d\n", __func__,
171 hdr->minorversion, hdr->nops);
1da177e4
LT		 172 return 0;
173}
174
e6f684f6 175static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
1da177e4 176{
5704fdeb 177 __be32 *p;
1da177e4
LT		 178 p = read_buf(xdr, 4);
179 if (unlikely(p == NULL))
31d2b435 180 return htonl(NFS4ERR_RESOURCE_HDR);
1da177e4
LT		 181 *op = ntohl(*p);
182 return 0;
183}
184
e6f684f6 185static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args)
1da177e4 186{
e6f684f6 187 __be32 status;
1da177e4
LT		 188
189 status = decode_fh(xdr, &args->fh);
190 if (unlikely(status != 0))
191 goto out;
671beed7 192 args->addr = svc_addr(rqstp);
1da177e4
LT		 193 status = decode_bitmap(xdr, args->bitmap);
194out:
3110ff80 195 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
1da177e4
LT		 196 return status;
197}
198
e6f684f6 199static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args)
1da177e4 200{
5704fdeb 201 __be32 *p;
e6f684f6 202 __be32 status;
1da177e4 203
c1d35866 204 args->addr = svc_addr(rqstp);
1da177e4
LT		 205 status = decode_stateid(xdr, &args->stateid);
206 if (unlikely(status != 0))
207 goto out;
208 p = read_buf(xdr, 4);
209 if (unlikely(p == NULL)) {
210 status = htonl(NFS4ERR_RESOURCE);
211 goto out;
212 }
213 args->truncate = ntohl(*p);
214 status = decode_fh(xdr, &args->fh);
215out:
3110ff80 216 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
3873bc50 217 return status;
1da177e4
LT		 218}
219
4aece6a1
BH		 220#if defined(CONFIG_NFS_V4_1)
221
222static unsigned decode_sessionid(struct xdr_stream *xdr,
223 struct nfs4_sessionid *sid)
224{
225 uint32_t *p;
226 int len = NFS4_MAX_SESSIONID_LEN;
227
228 p = read_buf(xdr, len);
229 if (unlikely(p == NULL))
a419aef8 230 return htonl(NFS4ERR_RESOURCE);
4aece6a1
BH		 231
232 memcpy(sid->data, p, len);
233 return 0;
234}
235
236static unsigned decode_rc_list(struct xdr_stream *xdr,
237 struct referring_call_list *rc_list)
238{
239 uint32_t *p;
240 int i;
241 unsigned status;
242
243 status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
244 if (status)
245 goto out;
246
247 status = htonl(NFS4ERR_RESOURCE);
248 p = read_buf(xdr, sizeof(uint32_t));
249 if (unlikely(p == NULL))
250 goto out;
251
252 rc_list->rcl_nrefcalls = ntohl(*p++);
253 if (rc_list->rcl_nrefcalls) {
254 p = read_buf(xdr,
255 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
256 if (unlikely(p == NULL))
257 goto out;
258 rc_list->rcl_refcalls = kmalloc(rc_list->rcl_nrefcalls *
259 sizeof(*rc_list->rcl_refcalls),
260 GFP_KERNEL);
261 if (unlikely(rc_list->rcl_refcalls == NULL))
262 goto out;
263 for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
264 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
265 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
266 }
267 }
268 status = 0;
269
270out:
271 return status;
272}
273
274static unsigned decode_cb_sequence_args(struct svc_rqst *rqstp,
275 struct xdr_stream *xdr,
276 struct cb_sequenceargs *args)
277{
278 uint32_t *p;
279 int i;
280 unsigned status;
281
282 status = decode_sessionid(xdr, &args->csa_sessionid);
283 if (status)
284 goto out;
285
286 status = htonl(NFS4ERR_RESOURCE);
287 p = read_buf(xdr, 5 * sizeof(uint32_t));
288 if (unlikely(p == NULL))
289 goto out;
290
65fc64e5 291 args->csa_addr = svc_addr(rqstp);
4aece6a1
BH		 292 args->csa_sequenceid = ntohl(*p++);
293 args->csa_slotid = ntohl(*p++);
294 args->csa_highestslotid = ntohl(*p++);
295 args->csa_cachethis = ntohl(*p++);
296 args->csa_nrclists = ntohl(*p++);
297 args->csa_rclists = NULL;
298 if (args->csa_nrclists) {
299 args->csa_rclists = kmalloc(args->csa_nrclists *
300 sizeof(*args->csa_rclists),
301 GFP_KERNEL);
302 if (unlikely(args->csa_rclists == NULL))
303 goto out;
304
305 for (i = 0; i < args->csa_nrclists; i++) {
306 status = decode_rc_list(xdr, &args->csa_rclists[i]);
307 if (status)
308 goto out_free;
309 }
310 }
311 status = 0;
312
313 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u "
314 "highestslotid %u cachethis %d nrclists %u\n",
315 __func__,
316 ((u32 *)&args->csa_sessionid)[0],
317 ((u32 *)&args->csa_sessionid)[1],
318 ((u32 *)&args->csa_sessionid)[2],
319 ((u32 *)&args->csa_sessionid)[3],
320 args->csa_sequenceid, args->csa_slotid,
321 args->csa_highestslotid, args->csa_cachethis,
322 args->csa_nrclists);
323out:
324 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
325 return status;
326
327out_free:
328 for (i = 0; i < args->csa_nrclists; i++)
329 kfree(args->csa_rclists[i].rcl_refcalls);
330 kfree(args->csa_rclists);
331 goto out;
332}
333
31f09607
AB		 334static unsigned decode_recallany_args(struct svc_rqst *rqstp,
335 struct xdr_stream *xdr,
336 struct cb_recallanyargs *args)
337{
338 uint32_t *p;
339
340 args->craa_addr = svc_addr(rqstp);
341 p = read_buf(xdr, 4);
342 if (unlikely(p == NULL))
343 return htonl(NFS4ERR_BADXDR);
344 args->craa_objs_to_keep = ntohl(*p++);
345 p = read_buf(xdr, 4);
346 if (unlikely(p == NULL))
347 return htonl(NFS4ERR_BADXDR);
348 args->craa_type_mask = ntohl(*p);
349
350 return 0;
351}
352
b9efa1b2
AA		 353static unsigned decode_recallslot_args(struct svc_rqst *rqstp,
354 struct xdr_stream *xdr,
355 struct cb_recallslotargs *args)
356{
357 __be32 *p;
358
359 args->crsa_addr = svc_addr(rqstp);
360 p = read_buf(xdr, 4);
361 if (unlikely(p == NULL))
362 return htonl(NFS4ERR_BADXDR);
363 args->crsa_target_max_slots = ntohl(*p++);
364 return 0;
365}
366
4aece6a1
BH		 367#endif /* CONFIG_NFS_V4_1 */
368
e6f684f6 369static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
1da177e4 370{
5704fdeb 371 __be32 *p;
1da177e4
LT		 372
373 p = xdr_reserve_space(xdr, 4 + len);
374 if (unlikely(p == NULL))
375 return htonl(NFS4ERR_RESOURCE);
376 xdr_encode_opaque(p, str, len);
377 return 0;
378}
379
380#define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE)
381#define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY)
5704fdeb 382static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep)
1da177e4 383{
5704fdeb
AV		 384 __be32 bm[2];
385 __be32 *p;
1da177e4
LT		 386
387 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0);
388 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1);
389 if (bm[1] != 0) {
390 p = xdr_reserve_space(xdr, 16);
391 if (unlikely(p == NULL))
392 return htonl(NFS4ERR_RESOURCE);
393 *p++ = htonl(2);
394 *p++ = bm[0];
395 *p++ = bm[1];
396 } else if (bm[0] != 0) {
397 p = xdr_reserve_space(xdr, 12);
398 if (unlikely(p == NULL))
399 return htonl(NFS4ERR_RESOURCE);
400 *p++ = htonl(1);
401 *p++ = bm[0];
402 } else {
403 p = xdr_reserve_space(xdr, 8);
404 if (unlikely(p == NULL))
405 return htonl(NFS4ERR_RESOURCE);
406 *p++ = htonl(0);
407 }
408 *savep = p;
409 return 0;
410}
411
e6f684f6 412static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
1da177e4 413{
5704fdeb 414 __be32 *p;
1da177e4
LT		 415
416 if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
417 return 0;
418 p = xdr_reserve_space(xdr, 8);
90dc7d27 419 if (unlikely(!p))
1da177e4
LT		 420 return htonl(NFS4ERR_RESOURCE);
421 p = xdr_encode_hyper(p, change);
422 return 0;
423}
424
e6f684f6 425static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
1da177e4 426{
5704fdeb 427 __be32 *p;
1da177e4
LT		 428
429 if (!(bitmap[0] & FATTR4_WORD0_SIZE))
430 return 0;
431 p = xdr_reserve_space(xdr, 8);
90dc7d27 432 if (unlikely(!p))
1da177e4
LT		 433 return htonl(NFS4ERR_RESOURCE);
434 p = xdr_encode_hyper(p, size);
435 return 0;
436}
437
e6f684f6 438static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
1da177e4 439{
5704fdeb 440 __be32 *p;
1da177e4
LT		 441
442 p = xdr_reserve_space(xdr, 12);
90dc7d27 443 if (unlikely(!p))
1da177e4
LT		 444 return htonl(NFS4ERR_RESOURCE);
445 p = xdr_encode_hyper(p, time->tv_sec);
446 *p = htonl(time->tv_nsec);
447 return 0;
448}
449
e6f684f6 450static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
1da177e4
LT		 451{
452 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
453 return 0;
454 return encode_attr_time(xdr,time);
455}
456
e6f684f6 457static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
1da177e4
LT		 458{
459 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
460 return 0;
461 return encode_attr_time(xdr,time);
462}
463
e6f684f6 464static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
1da177e4 465{
e6f684f6 466 __be32 status;
1da177e4
LT		 467
468 hdr->status = xdr_reserve_space(xdr, 4);
469 if (unlikely(hdr->status == NULL))
470 return htonl(NFS4ERR_RESOURCE);
471 status = encode_string(xdr, hdr->taglen, hdr->tag);
472 if (unlikely(status != 0))
473 return status;
474 hdr->nops = xdr_reserve_space(xdr, 4);
475 if (unlikely(hdr->nops == NULL))
476 return htonl(NFS4ERR_RESOURCE);
477 return 0;
478}
479
e6f684f6 480static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
1da177e4 481{
5704fdeb 482 __be32 *p;
1da177e4
LT		 483
484 p = xdr_reserve_space(xdr, 8);
485 if (unlikely(p == NULL))
31d2b435 486 return htonl(NFS4ERR_RESOURCE_HDR);
1da177e4
LT		 487 *p++ = htonl(op);
488 *p = res;
489 return 0;
490}
491
e6f684f6 492static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res)
1da177e4 493{
5704fdeb 494 __be32 *savep = NULL;
e6f684f6 495 __be32 status = res->status;
1da177e4
LT		 496
497 if (unlikely(status != 0))
498 goto out;
499 status = encode_attr_bitmap(xdr, res->bitmap, &savep);
500 if (unlikely(status != 0))
501 goto out;
502 status = encode_attr_change(xdr, res->bitmap, res->change_attr);
503 if (unlikely(status != 0))
504 goto out;
505 status = encode_attr_size(xdr, res->bitmap, res->size);
506 if (unlikely(status != 0))
507 goto out;
508 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
509 if (unlikely(status != 0))
510 goto out;
511 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
512 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
513out:
3110ff80 514 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
1da177e4
LT		 515 return status;
516}
517
34bc47c9
BH		 518#if defined(CONFIG_NFS_V4_1)
519
4aece6a1
BH		 520static unsigned encode_sessionid(struct xdr_stream *xdr,
521 const struct nfs4_sessionid *sid)
522{
523 uint32_t *p;
524 int len = NFS4_MAX_SESSIONID_LEN;
525
526 p = xdr_reserve_space(xdr, len);
527 if (unlikely(p == NULL))
528 return htonl(NFS4ERR_RESOURCE);
529
530 memcpy(p, sid, len);
531 return 0;
532}
533
534static unsigned encode_cb_sequence_res(struct svc_rqst *rqstp,
535 struct xdr_stream *xdr,
536 const struct cb_sequenceres *res)
537{
538 uint32_t *p;
539 unsigned status = res->csr_status;
540
541 if (unlikely(status != 0))
542 goto out;
543
544 encode_sessionid(xdr, &res->csr_sessionid);
545
546 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
547 if (unlikely(p == NULL))
548 return htonl(NFS4ERR_RESOURCE);
549
550 *p++ = htonl(res->csr_sequenceid);
551 *p++ = htonl(res->csr_slotid);
552 *p++ = htonl(res->csr_highestslotid);
553 *p++ = htonl(res->csr_target_highestslotid);
554out:
555 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
556 return status;
557}
558
34bc47c9
BH		 559static __be32
560preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
561{
281fe15d
BH		 562 if (op_nr == OP_CB_SEQUENCE) {
563 if (nop != 0)
564 return htonl(NFS4ERR_SEQUENCE_POS);
565 } else {
566 if (nop == 0)
567 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
568 }
569
34bc47c9
BH		 570 switch (op_nr) {
571 case OP_CB_GETATTR:
572 case OP_CB_RECALL:
4aece6a1 573 case OP_CB_SEQUENCE:
31f09607 574 case OP_CB_RECALL_ANY:
b9efa1b2 575 case OP_CB_RECALL_SLOT:
34bc47c9
BH		 576 *op = &callback_ops[op_nr];
577 break;
578
579 case OP_CB_LAYOUTRECALL:
580 case OP_CB_NOTIFY_DEVICEID:
581 case OP_CB_NOTIFY:
582 case OP_CB_PUSH_DELEG:
34bc47c9 583 case OP_CB_RECALLABLE_OBJ_AVAIL:
34bc47c9
BH		 584 case OP_CB_WANTS_CANCELLED:
585 case OP_CB_NOTIFY_LOCK:
586 return htonl(NFS4ERR_NOTSUPP);
587
588 default:
589 return htonl(NFS4ERR_OP_ILLEGAL);
590 }
591
592 return htonl(NFS_OK);
593}
594
595#else /* CONFIG_NFS_V4_1 */
596
597static __be32
598preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
599{
600 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
601}
602
603#endif /* CONFIG_NFS_V4_1 */
604
605static __be32
606preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
607{
608 switch (op_nr) {
609 case OP_CB_GETATTR:
610 case OP_CB_RECALL:
611 *op = &callback_ops[op_nr];
612 break;
613 default:
614 return htonl(NFS4ERR_OP_ILLEGAL);
615 }
616
617 return htonl(NFS_OK);
618}
619
620static __be32 process_op(uint32_t minorversion, int nop,
621 struct svc_rqst *rqstp,
1da177e4 622 struct xdr_stream *xdr_in, void *argp,
4911096f 623 struct xdr_stream *xdr_out, void *resp, int* drc_status)
1da177e4 624{
a162a6b8 625 struct callback_op *op = &callback_ops[0];
31d2b435 626 unsigned int op_nr;
34bc47c9 627 __be32 status;
1da177e4 628 long maxlen;
e6f684f6 629 __be32 res;
1da177e4 630
3110ff80 631 dprintk("%s: start\n", __func__);
1da177e4 632 status = decode_op_hdr(xdr_in, &op_nr);
31d2b435
AA		 633 if (unlikely(status))
634 return status;
1da177e4 635
34bc47c9
BH		 636 dprintk("%s: minorversion=%d nop=%d op_nr=%u\n",
637 __func__, minorversion, nop, op_nr);
638
639 status = minorversion ? preprocess_nfs41_op(nop, op_nr, &op) :
640 preprocess_nfs4_op(op_nr, &op);
641 if (status == htonl(NFS4ERR_OP_ILLEGAL))
642 op_nr = OP_CB_ILLEGAL;
b92b3019
AA		 643 if (status)
644 goto encode_hdr;
31d2b435 645
4911096f
AA		 646 if (*drc_status) {
647 status = *drc_status;
648 goto encode_hdr;
649 }
650
1da177e4
LT		 651 maxlen = xdr_out->end - xdr_out->p;
652 if (maxlen > 0 && maxlen < PAGE_SIZE) {
e95e60da
AA		 653 status = op->decode_args(rqstp, xdr_in, argp);
654 if (likely(status == 0))
1da177e4
LT		 655 status = op->process_op(argp, resp);
656 } else
657 status = htonl(NFS4ERR_RESOURCE);
658
4911096f
AA		 659 /* Only set by OP_CB_SEQUENCE processing */
660 if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
661 *drc_status = status;
662 status = 0;
663 }
664
b92b3019 665encode_hdr:
1da177e4 666 res = encode_op_hdr(xdr_out, op_nr, status);
31d2b435
AA		 667 if (unlikely(res))
668 return res;
1da177e4
LT		 669 if (op->encode_res != NULL && status == 0)
670 status = op->encode_res(rqstp, xdr_out, resp);
3110ff80 671 dprintk("%s: done, status = %d\n", __func__, ntohl(status));
1da177e4
LT		 672 return status;
673}
674
675/*
676 * Decode, process and encode a COMPOUND
677 */
7111c66e 678static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp)
1da177e4 679{
3a6258e1
TM		 680 struct cb_compound_hdr_arg hdr_arg = { 0 };
681 struct cb_compound_hdr_res hdr_res = { NULL };
1da177e4 682 struct xdr_stream xdr_in, xdr_out;
5704fdeb 683 __be32 *p;
4911096f 684 __be32 status, drc_status = 0;
3a6258e1 685 unsigned int nops = 0;
1da177e4 686
3110ff80 687 dprintk("%s: start\n", __func__);
1da177e4
LT		 688
689 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
690
5704fdeb 691 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
1da177e4
LT		 692 xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
693
3a6258e1
TM		 694 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
695 if (status == __constant_htonl(NFS4ERR_RESOURCE))
696 return rpc_garbage_args;
697
1da177e4
LT		 698 hdr_res.taglen = hdr_arg.taglen;
699 hdr_res.tag = hdr_arg.tag;
3a6258e1
TM		 700 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0)
701 return rpc_system_err;
1da177e4 702
3a6258e1 703 while (status == 0 && nops != hdr_arg.nops) {
4911096f
AA		 704 status = process_op(hdr_arg.minorversion, nops, rqstp,
705 &xdr_in, argp, &xdr_out, resp, &drc_status);
1da177e4
LT		 706 nops++;
707 }
3a6258e1 708
31d2b435
AA		 709 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
710 * resource error in cb_compound status without returning op */
711 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
712 status = htonl(NFS4ERR_RESOURCE);
713 nops--;
714 }
715
1da177e4
LT		 716 *hdr_res.status = status;
717 *hdr_res.nops = htonl(nops);
3110ff80 718 dprintk("%s: done, status = %u\n", __func__, ntohl(status));
1da177e4
LT		 719 return rpc_success;
720}
721
722/*
723 * Define NFS4 callback COMPOUND ops.
724 */
725static struct callback_op callback_ops[] = {
726 [0] = {
727 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
728 },
729 [OP_CB_GETATTR] = {
730 .process_op = (callback_process_op_t)nfs4_callback_getattr,
731 .decode_args = (callback_decode_arg_t)decode_getattr_args,
732 .encode_res = (callback_encode_res_t)encode_getattr_res,
733 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
734 },
735 [OP_CB_RECALL] = {
736 .process_op = (callback_process_op_t)nfs4_callback_recall,
737 .decode_args = (callback_decode_arg_t)decode_recall_args,
738 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
4aece6a1
BH		 739 },
740#if defined(CONFIG_NFS_V4_1)
741 [OP_CB_SEQUENCE] = {
742 .process_op = (callback_process_op_t)nfs4_callback_sequence,
743 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args,
744 .encode_res = (callback_encode_res_t)encode_cb_sequence_res,
745 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
746 },
31f09607
AB		 747 [OP_CB_RECALL_ANY] = {
748 .process_op = (callback_process_op_t)nfs4_callback_recallany,
749 .decode_args = (callback_decode_arg_t)decode_recallany_args,
750 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
751 },
b9efa1b2
AA		 752 [OP_CB_RECALL_SLOT] = {
753 .process_op = (callback_process_op_t)nfs4_callback_recallslot,
754 .decode_args = (callback_decode_arg_t)decode_recallslot_args,
755 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
756 },
4aece6a1 757#endif /* CONFIG_NFS_V4_1 */
1da177e4
LT		 758};
759
760/*
761 * Define NFS4 callback procedures
762 */
763static struct svc_procedure nfs4_callback_procedures1[] = {
764 [CB_NULL] = {
765 .pc_func = nfs4_callback_null,
766 .pc_decode = (kxdrproc_t)nfs4_decode_void,
767 .pc_encode = (kxdrproc_t)nfs4_encode_void,
768 .pc_xdrressize = 1,
769 },
770 [CB_COMPOUND] = {
771 .pc_func = nfs4_callback_compound,
772 .pc_encode = (kxdrproc_t)nfs4_encode_void,
773 .pc_argsize = 256,
774 .pc_ressize = 256,
775 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
776 }
777};
778
779struct svc_version nfs4_callback_version1 = {
780 .vs_vers = 1,
781 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
782 .vs_proc = nfs4_callback_procedures1,
783 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
784 .vs_dispatch = NULL,
785};
786
07bccc2d
AB		 787struct svc_version nfs4_callback_version4 = {
788 .vs_vers = 4,
789 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
790 .vs_proc = nfs4_callback_procedures1,
791 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
792 .vs_dispatch = NULL,
793};
kernel source for telekom puls (alcatel/mediatek)