projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge branch 'osd-devel' into nfs-for-next
[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>
5a0e3ad6 12#include <linux/slab.h>
c36fca52 13#include <linux/sunrpc/bc_xprt.h>
4ce79717 14#include "nfs4_fs.h"
1da177e4 15#include "callback.h"
c36fca52 16#include "internal.h"
1da177e4
LT		 17
18#define CB_OP_TAGLEN_MAXSZ (512)
19#define CB_OP_HDR_RES_MAXSZ (2 + CB_OP_TAGLEN_MAXSZ)
20#define CB_OP_GETATTR_BITMAP_MAXSZ (4)
21#define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
22 CB_OP_GETATTR_BITMAP_MAXSZ + \
23 2 + 2 + 3 + 3)
24#define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
25
4aece6a1 26#if defined(CONFIG_NFS_V4_1)
f2a62561 27#define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
1be5683b 28#define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
4aece6a1
BH		 29#define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
30 4 + 1 + 3)
31f09607 31#define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
b9efa1b2 32#define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
4aece6a1
BH		 33#endif /* CONFIG_NFS_V4_1 */
34
1da177e4
LT		 35#define NFSDBG_FACILITY NFSDBG_CALLBACK
36
31d2b435
AA		 37/* Internal error code */
38#define NFS4ERR_RESOURCE_HDR 11050
39
c36fca52
AA		 40typedef __be32 (*callback_process_op_t)(void *, void *,
41 struct cb_process_state *);
e6f684f6
AV		 42typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *);
43typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *);
1da177e4
LT		 44
45
46struct callback_op {
47 callback_process_op_t process_op;
48 callback_decode_arg_t decode_args;
49 callback_encode_res_t encode_res;
50 long res_maxsize;
51};
52
53static struct callback_op callback_ops[];
54
7111c66e 55static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp)
1da177e4
LT		 56{
57 return htonl(NFS4_OK);
58}
59
5704fdeb 60static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
1da177e4
LT		 61{
62 return xdr_argsize_check(rqstp, p);
63}
64
5704fdeb 65static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
1da177e4
LT		 66{
67 return xdr_ressize_check(rqstp, p);
68}
69
5704fdeb 70static __be32 *read_buf(struct xdr_stream *xdr, int nbytes)
1da177e4 71{
5704fdeb 72 __be32 *p;
1da177e4
LT		 73
74 p = xdr_inline_decode(xdr, nbytes);
75 if (unlikely(p == NULL))
76 printk(KERN_WARNING "NFSv4 callback reply buffer overflowed!\n");
77 return p;
78}
79
e6f684f6 80static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str)
1da177e4 81{
5704fdeb 82 __be32 *p;
1da177e4
LT		 83
84 p = read_buf(xdr, 4);
85 if (unlikely(p == NULL))
86 return htonl(NFS4ERR_RESOURCE);
87 *len = ntohl(*p);
88
89 if (*len != 0) {
90 p = read_buf(xdr, *len);
91 if (unlikely(p == NULL))
92 return htonl(NFS4ERR_RESOURCE);
93 *str = (const char *)p;
94 } else
95 *str = NULL;
96
97 return 0;
98}
99
e6f684f6 100static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
1da177e4 101{
5704fdeb 102 __be32 *p;
1da177e4
LT		 103
104 p = read_buf(xdr, 4);
105 if (unlikely(p == NULL))
106 return htonl(NFS4ERR_RESOURCE);
107 fh->size = ntohl(*p);
108 if (fh->size > NFS4_FHSIZE)
109 return htonl(NFS4ERR_BADHANDLE);
110 p = read_buf(xdr, fh->size);
111 if (unlikely(p == NULL))
112 return htonl(NFS4ERR_RESOURCE);
113 memcpy(&fh->data[0], p, fh->size);
114 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
115 return 0;
116}
117
e6f684f6 118static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
1da177e4 119{
5704fdeb 120 __be32 *p;
1da177e4
LT		 121 unsigned int attrlen;
122
123 p = read_buf(xdr, 4);
124 if (unlikely(p == NULL))
125 return htonl(NFS4ERR_RESOURCE);
126 attrlen = ntohl(*p);
127 p = read_buf(xdr, attrlen << 2);
128 if (unlikely(p == NULL))
129 return htonl(NFS4ERR_RESOURCE);
130 if (likely(attrlen > 0))
131 bitmap[0] = ntohl(*p++);
132 if (attrlen > 1)
133 bitmap[1] = ntohl(*p);
134 return 0;
135}
136
e6f684f6 137static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
1da177e4 138{
5704fdeb 139 __be32 *p;
1da177e4
LT		 140
141 p = read_buf(xdr, 16);
142 if (unlikely(p == NULL))
143 return htonl(NFS4ERR_RESOURCE);
144 memcpy(stateid->data, p, 16);
145 return 0;
146}
147
e6f684f6 148static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
1da177e4 149{
5704fdeb 150 __be32 *p;
e6f684f6 151 __be32 status;
1da177e4
LT		 152
153 status = decode_string(xdr, &hdr->taglen, &hdr->tag);
154 if (unlikely(status != 0))
155 return status;
156 /* We do not like overly long tags! */
5cce428d 157 if (hdr->taglen > CB_OP_TAGLEN_MAXSZ - 12) {
1da177e4 158 printk("NFSv4 CALLBACK %s: client sent tag of length %u\n",
3110ff80 159 __func__, hdr->taglen);
1da177e4
LT		 160 return htonl(NFS4ERR_RESOURCE);
161 }
162 p = read_buf(xdr, 12);
163 if (unlikely(p == NULL))
164 return htonl(NFS4ERR_RESOURCE);
b8f2ef84 165 hdr->minorversion = ntohl(*p++);
48a9e2d2
BH		 166 /* Check minor version is zero or one. */
167 if (hdr->minorversion <= 1) {
c36fca52 168 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 */
48a9e2d2 169 } else {
b8f2ef84
BH		 170 printk(KERN_WARNING "%s: NFSv4 server callback with "
171 "illegal minor version %u!\n",
172 __func__, hdr->minorversion);
1da177e4
LT		 173 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
174 }
1da177e4 175 hdr->nops = ntohl(*p);
b8f2ef84
BH		 176 dprintk("%s: minorversion %d nops %d\n", __func__,
177 hdr->minorversion, hdr->nops);
1da177e4
LT		 178 return 0;
179}
180
e6f684f6 181static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
1da177e4 182{
5704fdeb 183 __be32 *p;
1da177e4
LT		 184 p = read_buf(xdr, 4);
185 if (unlikely(p == NULL))
31d2b435 186 return htonl(NFS4ERR_RESOURCE_HDR);
1da177e4
LT		 187 *op = ntohl(*p);
188 return 0;
189}
190
e6f684f6 191static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args)
1da177e4 192{
e6f684f6 193 __be32 status;
1da177e4
LT		 194
195 status = decode_fh(xdr, &args->fh);
196 if (unlikely(status != 0))
197 goto out;
671beed7 198 args->addr = svc_addr(rqstp);
1da177e4
LT		 199 status = decode_bitmap(xdr, args->bitmap);
200out:
3110ff80 201 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
1da177e4
LT		 202 return status;
203}
204
e6f684f6 205static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args)
1da177e4 206{
5704fdeb 207 __be32 *p;
e6f684f6 208 __be32 status;
1da177e4 209
c1d35866 210 args->addr = svc_addr(rqstp);
1da177e4
LT		 211 status = decode_stateid(xdr, &args->stateid);
212 if (unlikely(status != 0))
213 goto out;
214 p = read_buf(xdr, 4);
215 if (unlikely(p == NULL)) {
216 status = htonl(NFS4ERR_RESOURCE);
217 goto out;
218 }
219 args->truncate = ntohl(*p);
220 status = decode_fh(xdr, &args->fh);
221out:
3110ff80 222 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
3873bc50 223 return status;
1da177e4
LT		 224}
225
4aece6a1
BH		 226#if defined(CONFIG_NFS_V4_1)
227
f2a62561
FI		 228static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
229 struct xdr_stream *xdr,
230 struct cb_layoutrecallargs *args)
231{
232 __be32 *p;
233 __be32 status = 0;
234 uint32_t iomode;
235
236 args->cbl_addr = svc_addr(rqstp);
237 p = read_buf(xdr, 4 * sizeof(uint32_t));
238 if (unlikely(p == NULL)) {
239 status = htonl(NFS4ERR_BADXDR);
240 goto out;
241 }
242
243 args->cbl_layout_type = ntohl(*p++);
244 /* Depite the spec's xdr, iomode really belongs in the FILE switch,
25985edc 245 * as it is unusable and ignored with the other types.
f2a62561
FI		 246 */
247 iomode = ntohl(*p++);
248 args->cbl_layoutchanged = ntohl(*p++);
249 args->cbl_recall_type = ntohl(*p++);
250
251 if (args->cbl_recall_type == RETURN_FILE) {
252 args->cbl_range.iomode = iomode;
253 status = decode_fh(xdr, &args->cbl_fh);
254 if (unlikely(status != 0))
255 goto out;
256
257 p = read_buf(xdr, 2 * sizeof(uint64_t));
258 if (unlikely(p == NULL)) {
259 status = htonl(NFS4ERR_BADXDR);
260 goto out;
261 }
262 p = xdr_decode_hyper(p, &args->cbl_range.offset);
263 p = xdr_decode_hyper(p, &args->cbl_range.length);
264 status = decode_stateid(xdr, &args->cbl_stateid);
265 if (unlikely(status != 0))
266 goto out;
267 } else if (args->cbl_recall_type == RETURN_FSID) {
268 p = read_buf(xdr, 2 * sizeof(uint64_t));
269 if (unlikely(p == NULL)) {
270 status = htonl(NFS4ERR_BADXDR);
271 goto out;
272 }
273 p = xdr_decode_hyper(p, &args->cbl_fsid.major);
274 p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
275 } else if (args->cbl_recall_type != RETURN_ALL) {
276 status = htonl(NFS4ERR_BADXDR);
277 goto out;
278 }
279 dprintk("%s: ltype 0x%x iomode %d changed %d recall_type %d\n",
280 __func__,
281 args->cbl_layout_type, iomode,
282 args->cbl_layoutchanged, args->cbl_recall_type);
283out:
284 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
285 return status;
286}
287
1be5683b
ME		 288static
289__be32 decode_devicenotify_args(struct svc_rqst *rqstp,
290 struct xdr_stream *xdr,
291 struct cb_devicenotifyargs *args)
292{
293 __be32 *p;
294 __be32 status = 0;
295 u32 tmp;
296 int n, i;
297 args->ndevs = 0;
298
299 /* Num of device notifications */
300 p = read_buf(xdr, sizeof(uint32_t));
301 if (unlikely(p == NULL)) {
302 status = htonl(NFS4ERR_BADXDR);
303 goto out;
304 }
305 n = ntohl(*p++);
306 if (n <= 0)
307 goto out;
308
309 args->devs = kmalloc(n * sizeof(*args->devs), GFP_KERNEL);
310 if (!args->devs) {
311 status = htonl(NFS4ERR_DELAY);
312 goto out;
313 }
314
315 /* Decode each dev notification */
316 for (i = 0; i < n; i++) {
317 struct cb_devicenotifyitem *dev = &args->devs[i];
318
319 p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE);
320 if (unlikely(p == NULL)) {
321 status = htonl(NFS4ERR_BADXDR);
322 goto err;
323 }
324
325 tmp = ntohl(*p++); /* bitmap size */
326 if (tmp != 1) {
327 status = htonl(NFS4ERR_INVAL);
328 goto err;
329 }
330 dev->cbd_notify_type = ntohl(*p++);
331 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE &&
332 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) {
333 status = htonl(NFS4ERR_INVAL);
334 goto err;
335 }
336
337 tmp = ntohl(*p++); /* opaque size */
338 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) &&
339 (tmp != NFS4_DEVICEID4_SIZE + 8)) ||
340 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) &&
341 (tmp != NFS4_DEVICEID4_SIZE + 4))) {
342 status = htonl(NFS4ERR_INVAL);
343 goto err;
344 }
345 dev->cbd_layout_type = ntohl(*p++);
346 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE);
347 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
348
349 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
350 p = read_buf(xdr, sizeof(uint32_t));
351 if (unlikely(p == NULL)) {
352 status = htonl(NFS4ERR_BADXDR);
353 goto err;
354 }
355 dev->cbd_immediate = ntohl(*p++);
356 } else {
357 dev->cbd_immediate = 0;
358 }
359
360 args->ndevs++;
361
362 dprintk("%s: type %d layout 0x%x immediate %d\n",
363 __func__, dev->cbd_notify_type, dev->cbd_layout_type,
364 dev->cbd_immediate);
365 }
366out:
367 dprintk("%s: status %d ndevs %d\n",
368 __func__, ntohl(status), args->ndevs);
369 return status;
370err:
371 kfree(args->devs);
372 goto out;
373}
374
9733f0d9 375static __be32 decode_sessionid(struct xdr_stream *xdr,
4aece6a1
BH		 376 struct nfs4_sessionid *sid)
377{
9733f0d9 378 __be32 *p;
4aece6a1
BH		 379 int len = NFS4_MAX_SESSIONID_LEN;
380
381 p = read_buf(xdr, len);
382 if (unlikely(p == NULL))
a419aef8 383 return htonl(NFS4ERR_RESOURCE);
4aece6a1
BH		 384
385 memcpy(sid->data, p, len);
386 return 0;
387}
388
9733f0d9 389static __be32 decode_rc_list(struct xdr_stream *xdr,
4aece6a1
BH		 390 struct referring_call_list *rc_list)
391{
9733f0d9 392 __be32 *p;
4aece6a1 393 int i;
9733f0d9 394 __be32 status;
4aece6a1
BH		 395
396 status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
397 if (status)
398 goto out;
399
400 status = htonl(NFS4ERR_RESOURCE);
401 p = read_buf(xdr, sizeof(uint32_t));
402 if (unlikely(p == NULL))
403 goto out;
404
405 rc_list->rcl_nrefcalls = ntohl(*p++);
406 if (rc_list->rcl_nrefcalls) {
407 p = read_buf(xdr,
408 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
409 if (unlikely(p == NULL))
410 goto out;
411 rc_list->rcl_refcalls = kmalloc(rc_list->rcl_nrefcalls *
412 sizeof(*rc_list->rcl_refcalls),
413 GFP_KERNEL);
414 if (unlikely(rc_list->rcl_refcalls == NULL))
415 goto out;
416 for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
417 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
418 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
419 }
420 }
421 status = 0;
422
423out:
424 return status;
425}
426
9733f0d9 427static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
4aece6a1
BH		 428 struct xdr_stream *xdr,
429 struct cb_sequenceargs *args)
430{
9733f0d9 431 __be32 *p;
4aece6a1 432 int i;
9733f0d9 433 __be32 status;
4aece6a1
BH		 434
435 status = decode_sessionid(xdr, &args->csa_sessionid);
436 if (status)
437 goto out;
438
439 status = htonl(NFS4ERR_RESOURCE);
440 p = read_buf(xdr, 5 * sizeof(uint32_t));
441 if (unlikely(p == NULL))
442 goto out;
443
65fc64e5 444 args->csa_addr = svc_addr(rqstp);
4aece6a1
BH		 445 args->csa_sequenceid = ntohl(*p++);
446 args->csa_slotid = ntohl(*p++);
447 args->csa_highestslotid = ntohl(*p++);
448 args->csa_cachethis = ntohl(*p++);
449 args->csa_nrclists = ntohl(*p++);
450 args->csa_rclists = NULL;
451 if (args->csa_nrclists) {
452 args->csa_rclists = kmalloc(args->csa_nrclists *
453 sizeof(*args->csa_rclists),
454 GFP_KERNEL);
455 if (unlikely(args->csa_rclists == NULL))
456 goto out;
457
458 for (i = 0; i < args->csa_nrclists; i++) {
459 status = decode_rc_list(xdr, &args->csa_rclists[i]);
460 if (status)
461 goto out_free;
462 }
463 }
464 status = 0;
465
466 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u "
467 "highestslotid %u cachethis %d nrclists %u\n",
468 __func__,
469 ((u32 *)&args->csa_sessionid)[0],
470 ((u32 *)&args->csa_sessionid)[1],
471 ((u32 *)&args->csa_sessionid)[2],
472 ((u32 *)&args->csa_sessionid)[3],
473 args->csa_sequenceid, args->csa_slotid,
474 args->csa_highestslotid, args->csa_cachethis,
475 args->csa_nrclists);
476out:
477 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
478 return status;
479
480out_free:
481 for (i = 0; i < args->csa_nrclists; i++)
482 kfree(args->csa_rclists[i].rcl_refcalls);
483 kfree(args->csa_rclists);
484 goto out;
485}
486
9733f0d9 487static __be32 decode_recallany_args(struct svc_rqst *rqstp,
31f09607
AB		 488 struct xdr_stream *xdr,
489 struct cb_recallanyargs *args)
490{
d743c3c9
PT		 491 uint32_t bitmap[2];
492 __be32 *p, status;
31f09607
AB		 493
494 args->craa_addr = svc_addr(rqstp);
495 p = read_buf(xdr, 4);
496 if (unlikely(p == NULL))
497 return htonl(NFS4ERR_BADXDR);
498 args->craa_objs_to_keep = ntohl(*p++);
d743c3c9
PT		 499 status = decode_bitmap(xdr, bitmap);
500 if (unlikely(status))
501 return status;
502 args->craa_type_mask = bitmap[0];
31f09607
AB		 503
504 return 0;
505}
506
9733f0d9 507static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
b9efa1b2
AA		 508 struct xdr_stream *xdr,
509 struct cb_recallslotargs *args)
510{
511 __be32 *p;
512
513 args->crsa_addr = svc_addr(rqstp);
514 p = read_buf(xdr, 4);
515 if (unlikely(p == NULL))
516 return htonl(NFS4ERR_BADXDR);
517 args->crsa_target_max_slots = ntohl(*p++);
518 return 0;
519}
520
4aece6a1
BH		 521#endif /* CONFIG_NFS_V4_1 */
522
e6f684f6 523static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
1da177e4 524{
5704fdeb 525 __be32 *p;
1da177e4
LT		 526
527 p = xdr_reserve_space(xdr, 4 + len);
528 if (unlikely(p == NULL))
529 return htonl(NFS4ERR_RESOURCE);
530 xdr_encode_opaque(p, str, len);
531 return 0;
532}
533
534#define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE)
535#define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY)
5704fdeb 536static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep)
1da177e4 537{
5704fdeb
AV		 538 __be32 bm[2];
539 __be32 *p;
1da177e4
LT		 540
541 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0);
542 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1);
543 if (bm[1] != 0) {
544 p = xdr_reserve_space(xdr, 16);
545 if (unlikely(p == NULL))
546 return htonl(NFS4ERR_RESOURCE);
547 *p++ = htonl(2);
548 *p++ = bm[0];
549 *p++ = bm[1];
550 } else if (bm[0] != 0) {
551 p = xdr_reserve_space(xdr, 12);
552 if (unlikely(p == NULL))
553 return htonl(NFS4ERR_RESOURCE);
554 *p++ = htonl(1);
555 *p++ = bm[0];
556 } else {
557 p = xdr_reserve_space(xdr, 8);
558 if (unlikely(p == NULL))
559 return htonl(NFS4ERR_RESOURCE);
560 *p++ = htonl(0);
561 }
562 *savep = p;
563 return 0;
564}
565
e6f684f6 566static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
1da177e4 567{
5704fdeb 568 __be32 *p;
1da177e4
LT		 569
570 if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
571 return 0;
572 p = xdr_reserve_space(xdr, 8);
90dc7d27 573 if (unlikely(!p))
1da177e4
LT		 574 return htonl(NFS4ERR_RESOURCE);
575 p = xdr_encode_hyper(p, change);
576 return 0;
577}
578
e6f684f6 579static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
1da177e4 580{
5704fdeb 581 __be32 *p;
1da177e4
LT		 582
583 if (!(bitmap[0] & FATTR4_WORD0_SIZE))
584 return 0;
585 p = xdr_reserve_space(xdr, 8);
90dc7d27 586 if (unlikely(!p))
1da177e4
LT		 587 return htonl(NFS4ERR_RESOURCE);
588 p = xdr_encode_hyper(p, size);
589 return 0;
590}
591
e6f684f6 592static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
1da177e4 593{
5704fdeb 594 __be32 *p;
1da177e4
LT		 595
596 p = xdr_reserve_space(xdr, 12);
90dc7d27 597 if (unlikely(!p))
1da177e4
LT		 598 return htonl(NFS4ERR_RESOURCE);
599 p = xdr_encode_hyper(p, time->tv_sec);
600 *p = htonl(time->tv_nsec);
601 return 0;
602}
603
e6f684f6 604static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
1da177e4
LT		 605{
606 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
607 return 0;
608 return encode_attr_time(xdr,time);
609}
610
e6f684f6 611static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
1da177e4
LT		 612{
613 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
614 return 0;
615 return encode_attr_time(xdr,time);
616}
617
e6f684f6 618static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
1da177e4 619{
e6f684f6 620 __be32 status;
1da177e4
LT		 621
622 hdr->status = xdr_reserve_space(xdr, 4);
623 if (unlikely(hdr->status == NULL))
624 return htonl(NFS4ERR_RESOURCE);
625 status = encode_string(xdr, hdr->taglen, hdr->tag);
626 if (unlikely(status != 0))
627 return status;
628 hdr->nops = xdr_reserve_space(xdr, 4);
629 if (unlikely(hdr->nops == NULL))
630 return htonl(NFS4ERR_RESOURCE);
631 return 0;
632}
633
e6f684f6 634static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
1da177e4 635{
5704fdeb 636 __be32 *p;
1da177e4
LT		 637
638 p = xdr_reserve_space(xdr, 8);
639 if (unlikely(p == NULL))
31d2b435 640 return htonl(NFS4ERR_RESOURCE_HDR);
1da177e4
LT		 641 *p++ = htonl(op);
642 *p = res;
643 return 0;
644}
645
e6f684f6 646static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res)
1da177e4 647{
5704fdeb 648 __be32 *savep = NULL;
e6f684f6 649 __be32 status = res->status;
1da177e4
LT		 650
651 if (unlikely(status != 0))
652 goto out;
653 status = encode_attr_bitmap(xdr, res->bitmap, &savep);
654 if (unlikely(status != 0))
655 goto out;
656 status = encode_attr_change(xdr, res->bitmap, res->change_attr);
657 if (unlikely(status != 0))
658 goto out;
659 status = encode_attr_size(xdr, res->bitmap, res->size);
660 if (unlikely(status != 0))
661 goto out;
662 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
663 if (unlikely(status != 0))
664 goto out;
665 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
666 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
667out:
3110ff80 668 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
1da177e4
LT		 669 return status;
670}
671
34bc47c9
BH		 672#if defined(CONFIG_NFS_V4_1)
673
9733f0d9 674static __be32 encode_sessionid(struct xdr_stream *xdr,
4aece6a1
BH		 675 const struct nfs4_sessionid *sid)
676{
9733f0d9 677 __be32 *p;
4aece6a1
BH		 678 int len = NFS4_MAX_SESSIONID_LEN;
679
680 p = xdr_reserve_space(xdr, len);
681 if (unlikely(p == NULL))
682 return htonl(NFS4ERR_RESOURCE);
683
684 memcpy(p, sid, len);
685 return 0;
686}
687
9733f0d9 688static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
4aece6a1
BH		 689 struct xdr_stream *xdr,
690 const struct cb_sequenceres *res)
691{
9733f0d9 692 __be32 *p;
4aece6a1
BH		 693 unsigned status = res->csr_status;
694
695 if (unlikely(status != 0))
696 goto out;
697
698 encode_sessionid(xdr, &res->csr_sessionid);
699
700 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
701 if (unlikely(p == NULL))
702 return htonl(NFS4ERR_RESOURCE);
703
704 *p++ = htonl(res->csr_sequenceid);
705 *p++ = htonl(res->csr_slotid);
706 *p++ = htonl(res->csr_highestslotid);
707 *p++ = htonl(res->csr_target_highestslotid);
708out:
709 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
710 return status;
711}
712
34bc47c9
BH		 713static __be32
714preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
715{
281fe15d
BH		 716 if (op_nr == OP_CB_SEQUENCE) {
717 if (nop != 0)
718 return htonl(NFS4ERR_SEQUENCE_POS);
719 } else {
720 if (nop == 0)
721 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
722 }
723
34bc47c9
BH		 724 switch (op_nr) {
725 case OP_CB_GETATTR:
726 case OP_CB_RECALL:
4aece6a1 727 case OP_CB_SEQUENCE:
31f09607 728 case OP_CB_RECALL_ANY:
b9efa1b2 729 case OP_CB_RECALL_SLOT:
f2a62561 730 case OP_CB_LAYOUTRECALL:
1be5683b 731 case OP_CB_NOTIFY_DEVICEID:
34bc47c9
BH		 732 *op = &callback_ops[op_nr];
733 break;
734
34bc47c9
BH		 735 case OP_CB_NOTIFY:
736 case OP_CB_PUSH_DELEG:
34bc47c9 737 case OP_CB_RECALLABLE_OBJ_AVAIL:
34bc47c9
BH		 738 case OP_CB_WANTS_CANCELLED:
739 case OP_CB_NOTIFY_LOCK:
740 return htonl(NFS4ERR_NOTSUPP);
741
742 default:
743 return htonl(NFS4ERR_OP_ILLEGAL);
744 }
745
746 return htonl(NFS_OK);
747}
748
42acd021
AA		 749static void nfs4_callback_free_slot(struct nfs4_session *session)
750{
751 struct nfs4_slot_table *tbl = &session->bc_slot_table;
752
753 spin_lock(&tbl->slot_tbl_lock);
754 /*
755 * Let the state manager know callback processing done.
756 * A single slot, so highest used slotid is either 0 or -1
757 */
55a67399 758 tbl->highest_used_slotid = -1;
42acd021
AA		 759 nfs4_check_drain_bc_complete(session);
760 spin_unlock(&tbl->slot_tbl_lock);
761}
762
55a67399 763static void nfs4_cb_free_slot(struct cb_process_state *cps)
42acd021 764{
55a67399
TM		 765 if (cps->slotid != -1)
766 nfs4_callback_free_slot(cps->clp->cl_session);
42acd021
AA		 767}
768
34bc47c9
BH		 769#else /* CONFIG_NFS_V4_1 */
770
771static __be32
772preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
773{
774 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
775}
776
55a67399 777static void nfs4_cb_free_slot(struct cb_process_state *cps)
42acd021
AA		 778{
779}
34bc47c9
BH		 780#endif /* CONFIG_NFS_V4_1 */
781
782static __be32
783preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
784{
785 switch (op_nr) {
786 case OP_CB_GETATTR:
787 case OP_CB_RECALL:
788 *op = &callback_ops[op_nr];
789 break;
790 default:
791 return htonl(NFS4ERR_OP_ILLEGAL);
792 }
793
794 return htonl(NFS_OK);
795}
796
797static __be32 process_op(uint32_t minorversion, int nop,
798 struct svc_rqst *rqstp,
1da177e4 799 struct xdr_stream *xdr_in, void *argp,
c36fca52
AA		 800 struct xdr_stream *xdr_out, void *resp,
801 struct cb_process_state *cps)
1da177e4 802{
a162a6b8 803 struct callback_op *op = &callback_ops[0];
31d2b435 804 unsigned int op_nr;
34bc47c9 805 __be32 status;
1da177e4 806 long maxlen;
e6f684f6 807 __be32 res;
1da177e4 808
3110ff80 809 dprintk("%s: start\n", __func__);
1da177e4 810 status = decode_op_hdr(xdr_in, &op_nr);
31d2b435
AA		 811 if (unlikely(status))
812 return status;
1da177e4 813
34bc47c9
BH		 814 dprintk("%s: minorversion=%d nop=%d op_nr=%u\n",
815 __func__, minorversion, nop, op_nr);
816
817 status = minorversion ? preprocess_nfs41_op(nop, op_nr, &op) :
818 preprocess_nfs4_op(op_nr, &op);
819 if (status == htonl(NFS4ERR_OP_ILLEGAL))
820 op_nr = OP_CB_ILLEGAL;
b92b3019
AA		 821 if (status)
822 goto encode_hdr;
31d2b435 823
c36fca52
AA		 824 if (cps->drc_status) {
825 status = cps->drc_status;
4911096f
AA		 826 goto encode_hdr;
827 }
828
1da177e4
LT		 829 maxlen = xdr_out->end - xdr_out->p;
830 if (maxlen > 0 && maxlen < PAGE_SIZE) {
e95e60da
AA		 831 status = op->decode_args(rqstp, xdr_in, argp);
832 if (likely(status == 0))
c36fca52 833 status = op->process_op(argp, resp, cps);
1da177e4
LT		 834 } else
835 status = htonl(NFS4ERR_RESOURCE);
836
b92b3019 837encode_hdr:
1da177e4 838 res = encode_op_hdr(xdr_out, op_nr, status);
31d2b435
AA		 839 if (unlikely(res))
840 return res;
1da177e4
LT		 841 if (op->encode_res != NULL && status == 0)
842 status = op->encode_res(rqstp, xdr_out, resp);
3110ff80 843 dprintk("%s: done, status = %d\n", __func__, ntohl(status));
1da177e4
LT		 844 return status;
845}
846
847/*
848 * Decode, process and encode a COMPOUND
849 */
7111c66e 850static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp)
1da177e4 851{
3a6258e1
TM		 852 struct cb_compound_hdr_arg hdr_arg = { 0 };
853 struct cb_compound_hdr_res hdr_res = { NULL };
1da177e4 854 struct xdr_stream xdr_in, xdr_out;
c36fca52
AA		 855 __be32 *p, status;
856 struct cb_process_state cps = {
857 .drc_status = 0,
858 .clp = NULL,
55a67399 859 .slotid = -1,
c36fca52 860 };
3a6258e1 861 unsigned int nops = 0;
1da177e4 862
3110ff80 863 dprintk("%s: start\n", __func__);
1da177e4
LT		 864
865 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
866
5704fdeb 867 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
1da177e4
LT		 868 xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
869
3a6258e1
TM		 870 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
871 if (status == __constant_htonl(NFS4ERR_RESOURCE))
872 return rpc_garbage_args;
873
c36fca52
AA		 874 if (hdr_arg.minorversion == 0) {
875 cps.clp = nfs4_find_client_ident(hdr_arg.cb_ident);
778be232 876 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp))
c36fca52 877 return rpc_drop_reply;
778be232 878 }
c36fca52 879
1da177e4
LT		 880 hdr_res.taglen = hdr_arg.taglen;
881 hdr_res.tag = hdr_arg.tag;
3a6258e1
TM		 882 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0)
883 return rpc_system_err;
1da177e4 884
3a6258e1 885 while (status == 0 && nops != hdr_arg.nops) {
4911096f 886 status = process_op(hdr_arg.minorversion, nops, rqstp,
c36fca52 887 &xdr_in, argp, &xdr_out, resp, &cps);
1da177e4
LT		 888 nops++;
889 }
3a6258e1 890
31d2b435
AA		 891 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
892 * resource error in cb_compound status without returning op */
893 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
894 status = htonl(NFS4ERR_RESOURCE);
895 nops--;
896 }
897
1da177e4
LT		 898 *hdr_res.status = status;
899 *hdr_res.nops = htonl(nops);
55a67399 900 nfs4_cb_free_slot(&cps);
c36fca52 901 nfs_put_client(cps.clp);
3110ff80 902 dprintk("%s: done, status = %u\n", __func__, ntohl(status));
1da177e4
LT		 903 return rpc_success;
904}
905
906/*
907 * Define NFS4 callback COMPOUND ops.
908 */
909static struct callback_op callback_ops[] = {
910 [0] = {
911 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
912 },
913 [OP_CB_GETATTR] = {
914 .process_op = (callback_process_op_t)nfs4_callback_getattr,
915 .decode_args = (callback_decode_arg_t)decode_getattr_args,
916 .encode_res = (callback_encode_res_t)encode_getattr_res,
917 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
918 },
919 [OP_CB_RECALL] = {
920 .process_op = (callback_process_op_t)nfs4_callback_recall,
921 .decode_args = (callback_decode_arg_t)decode_recall_args,
922 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
4aece6a1
BH		 923 },
924#if defined(CONFIG_NFS_V4_1)
f2a62561
FI		 925 [OP_CB_LAYOUTRECALL] = {
926 .process_op = (callback_process_op_t)nfs4_callback_layoutrecall,
927 .decode_args =
928 (callback_decode_arg_t)decode_layoutrecall_args,
929 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
930 },
1be5683b
ME		 931 [OP_CB_NOTIFY_DEVICEID] = {
932 .process_op = (callback_process_op_t)nfs4_callback_devicenotify,
933 .decode_args =
934 (callback_decode_arg_t)decode_devicenotify_args,
935 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
936 },
4aece6a1
BH		 937 [OP_CB_SEQUENCE] = {
938 .process_op = (callback_process_op_t)nfs4_callback_sequence,
939 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args,
940 .encode_res = (callback_encode_res_t)encode_cb_sequence_res,
941 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
942 },
31f09607
AB		 943 [OP_CB_RECALL_ANY] = {
944 .process_op = (callback_process_op_t)nfs4_callback_recallany,
945 .decode_args = (callback_decode_arg_t)decode_recallany_args,
946 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
947 },
b9efa1b2
AA		 948 [OP_CB_RECALL_SLOT] = {
949 .process_op = (callback_process_op_t)nfs4_callback_recallslot,
950 .decode_args = (callback_decode_arg_t)decode_recallslot_args,
951 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
952 },
4aece6a1 953#endif /* CONFIG_NFS_V4_1 */
1da177e4
LT		 954};
955
956/*
957 * Define NFS4 callback procedures
958 */
959static struct svc_procedure nfs4_callback_procedures1[] = {
960 [CB_NULL] = {
961 .pc_func = nfs4_callback_null,
962 .pc_decode = (kxdrproc_t)nfs4_decode_void,
963 .pc_encode = (kxdrproc_t)nfs4_encode_void,
964 .pc_xdrressize = 1,
965 },
966 [CB_COMPOUND] = {
967 .pc_func = nfs4_callback_compound,
968 .pc_encode = (kxdrproc_t)nfs4_encode_void,
969 .pc_argsize = 256,
970 .pc_ressize = 256,
971 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
972 }
973};
974
975struct svc_version nfs4_callback_version1 = {
976 .vs_vers = 1,
977 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
978 .vs_proc = nfs4_callback_procedures1,
979 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
980 .vs_dispatch = NULL,
49697ee7 981 .vs_hidden = 1,
1da177e4
LT		 982};
983
07bccc2d
AB		 984struct svc_version nfs4_callback_version4 = {
985 .vs_vers = 4,
986 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
987 .vs_proc = nfs4_callback_procedures1,
988 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
989 .vs_dispatch = NULL,
990};
kernel source for telekom puls (alcatel/mediatek)