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btrfs: add comments to barriers before waitqueue_active
[linux-2.6/btrfs-unstable.git] / fs / nfs / callback_xdr.c
blob6b1697a01dde35e1384d72a4a7cd2e02d1afbf84
1 /*
2 * linux/fs/nfs/callback_xdr.c
3 *
4 * Copyright (C) 2004 Trond Myklebust
5 *
6 * NFSv4 callback encode/decode procedures
7 */
8 #include <linux/kernel.h>
9 #include <linux/sunrpc/svc.h>
10 #include <linux/nfs4.h>
11 #include <linux/nfs_fs.h>
12 #include <linux/ratelimit.h>
13 #include <linux/printk.h>
14 #include <linux/slab.h>
15 #include <linux/sunrpc/bc_xprt.h>
16 #include "nfs4_fs.h"
17 #include "callback.h"
18 #include "internal.h"
19 #include "nfs4session.h"
20
21 #define CB_OP_TAGLEN_MAXSZ (512)
22 #define CB_OP_HDR_RES_MAXSZ (2 + CB_OP_TAGLEN_MAXSZ)
23 #define CB_OP_GETATTR_BITMAP_MAXSZ (4)
24 #define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
25 CB_OP_GETATTR_BITMAP_MAXSZ + \
26 2 + 2 + 3 + 3)
27 #define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
28
29 #if defined(CONFIG_NFS_V4_1)
30 #define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
31 #define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
32 #define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
33 4 + 1 + 3)
34 #define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
35 #define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
36 #endif /* CONFIG_NFS_V4_1 */
37
38 #define NFSDBG_FACILITY NFSDBG_CALLBACK
39
40 /* Internal error code */
41 #define NFS4ERR_RESOURCE_HDR 11050
42
43 typedef __be32 (*callback_process_op_t)(void *, void *,
44 struct cb_process_state *);
45 typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *);
46 typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *);
47
48
49 struct callback_op {
50 callback_process_op_t process_op;
51 callback_decode_arg_t decode_args;
52 callback_encode_res_t encode_res;
53 long res_maxsize;
54 };
55
56 static struct callback_op callback_ops[];
57
58 static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp)
59 {
60 return htonl(NFS4_OK);
61 }
62
63 static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
64 {
65 return xdr_argsize_check(rqstp, p);
66 }
67
68 static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
69 {
70 return xdr_ressize_check(rqstp, p);
71 }
72
73 static __be32 *read_buf(struct xdr_stream *xdr, int nbytes)
74 {
75 __be32 *p;
76
77 p = xdr_inline_decode(xdr, nbytes);
78 if (unlikely(p == NULL))
79 printk(KERN_WARNING "NFS: NFSv4 callback reply buffer overflowed!\n");
80 return p;
81 }
82
83 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str)
84 {
85 __be32 *p;
86
87 p = read_buf(xdr, 4);
88 if (unlikely(p == NULL))
89 return htonl(NFS4ERR_RESOURCE);
90 *len = ntohl(*p);
91
92 if (*len != 0) {
93 p = read_buf(xdr, *len);
94 if (unlikely(p == NULL))
95 return htonl(NFS4ERR_RESOURCE);
96 *str = (const char *)p;
97 } else
98 *str = NULL;
99
100 return 0;
101 }
102
103 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
104 {
105 __be32 *p;
106
107 p = read_buf(xdr, 4);
108 if (unlikely(p == NULL))
109 return htonl(NFS4ERR_RESOURCE);
110 fh->size = ntohl(*p);
111 if (fh->size > NFS4_FHSIZE)
112 return htonl(NFS4ERR_BADHANDLE);
113 p = read_buf(xdr, fh->size);
114 if (unlikely(p == NULL))
115 return htonl(NFS4ERR_RESOURCE);
116 memcpy(&fh->data[0], p, fh->size);
117 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
118 return 0;
119 }
120
121 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
122 {
123 __be32 *p;
124 unsigned int attrlen;
125
126 p = read_buf(xdr, 4);
127 if (unlikely(p == NULL))
128 return htonl(NFS4ERR_RESOURCE);
129 attrlen = ntohl(*p);
130 p = read_buf(xdr, attrlen << 2);
131 if (unlikely(p == NULL))
132 return htonl(NFS4ERR_RESOURCE);
133 if (likely(attrlen > 0))
134 bitmap[0] = ntohl(*p++);
135 if (attrlen > 1)
136 bitmap[1] = ntohl(*p);
137 return 0;
138 }
139
140 static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
141 {
142 __be32 *p;
143
144 p = read_buf(xdr, NFS4_STATEID_SIZE);
145 if (unlikely(p == NULL))
146 return htonl(NFS4ERR_RESOURCE);
147 memcpy(stateid, p, NFS4_STATEID_SIZE);
148 return 0;
149 }
150
151 static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
152 {
153 __be32 *p;
154 __be32 status;
155
156 status = decode_string(xdr, &hdr->taglen, &hdr->tag);
157 if (unlikely(status != 0))
158 return status;
159 /* We do not like overly long tags! */
160 if (hdr->taglen > CB_OP_TAGLEN_MAXSZ - 12) {
161 printk("NFS: NFSv4 CALLBACK %s: client sent tag of length %u\n",
162 __func__, hdr->taglen);
163 return htonl(NFS4ERR_RESOURCE);
164 }
165 p = read_buf(xdr, 12);
166 if (unlikely(p == NULL))
167 return htonl(NFS4ERR_RESOURCE);
168 hdr->minorversion = ntohl(*p++);
169 /* Check for minor version support */
170 if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) {
171 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */
172 } else {
173 pr_warn_ratelimited("NFS: %s: NFSv4 server callback with "
174 "illegal minor version %u!\n",
175 __func__, hdr->minorversion);
176 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
177 }
178 hdr->nops = ntohl(*p);
179 dprintk("%s: minorversion %d nops %d\n", __func__,
180 hdr->minorversion, hdr->nops);
181 return 0;
182 }
183
184 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
185 {
186 __be32 *p;
187 p = read_buf(xdr, 4);
188 if (unlikely(p == NULL))
189 return htonl(NFS4ERR_RESOURCE_HDR);
190 *op = ntohl(*p);
191 return 0;
192 }
193
194 static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args)
195 {
196 __be32 status;
197
198 status = decode_fh(xdr, &args->fh);
199 if (unlikely(status != 0))
200 goto out;
201 args->addr = svc_addr(rqstp);
202 status = decode_bitmap(xdr, args->bitmap);
203 out:
204 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
205 return status;
206 }
207
208 static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args)
209 {
210 __be32 *p;
211 __be32 status;
212
213 args->addr = svc_addr(rqstp);
214 status = decode_stateid(xdr, &args->stateid);
215 if (unlikely(status != 0))
216 goto out;
217 p = read_buf(xdr, 4);
218 if (unlikely(p == NULL)) {
219 status = htonl(NFS4ERR_RESOURCE);
220 goto out;
221 }
222 args->truncate = ntohl(*p);
223 status = decode_fh(xdr, &args->fh);
224 out:
225 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
226 return status;
227 }
228
229 #if defined(CONFIG_NFS_V4_1)
230
231 static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
232 struct xdr_stream *xdr,
233 struct cb_layoutrecallargs *args)
234 {
235 __be32 *p;
236 __be32 status = 0;
237 uint32_t iomode;
238
239 args->cbl_addr = svc_addr(rqstp);
240 p = read_buf(xdr, 4 * sizeof(uint32_t));
241 if (unlikely(p == NULL)) {
242 status = htonl(NFS4ERR_BADXDR);
243 goto out;
244 }
245
246 args->cbl_layout_type = ntohl(*p++);
247 /* Depite the spec's xdr, iomode really belongs in the FILE switch,
248 * as it is unusable and ignored with the other types.
249 */
250 iomode = ntohl(*p++);
251 args->cbl_layoutchanged = ntohl(*p++);
252 args->cbl_recall_type = ntohl(*p++);
253
254 if (args->cbl_recall_type == RETURN_FILE) {
255 args->cbl_range.iomode = iomode;
256 status = decode_fh(xdr, &args->cbl_fh);
257 if (unlikely(status != 0))
258 goto out;
259
260 p = read_buf(xdr, 2 * sizeof(uint64_t));
261 if (unlikely(p == NULL)) {
262 status = htonl(NFS4ERR_BADXDR);
263 goto out;
264 }
265 p = xdr_decode_hyper(p, &args->cbl_range.offset);
266 p = xdr_decode_hyper(p, &args->cbl_range.length);
267 status = decode_stateid(xdr, &args->cbl_stateid);
268 if (unlikely(status != 0))
269 goto out;
270 } else if (args->cbl_recall_type == RETURN_FSID) {
271 p = read_buf(xdr, 2 * sizeof(uint64_t));
272 if (unlikely(p == NULL)) {
273 status = htonl(NFS4ERR_BADXDR);
274 goto out;
275 }
276 p = xdr_decode_hyper(p, &args->cbl_fsid.major);
277 p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
278 } else if (args->cbl_recall_type != RETURN_ALL) {
279 status = htonl(NFS4ERR_BADXDR);
280 goto out;
281 }
282 dprintk("%s: ltype 0x%x iomode %d changed %d recall_type %d\n",
283 __func__,
284 args->cbl_layout_type, iomode,
285 args->cbl_layoutchanged, args->cbl_recall_type);
286 out:
287 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
288 return status;
289 }
290
291 static
292 __be32 decode_devicenotify_args(struct svc_rqst *rqstp,
293 struct xdr_stream *xdr,
294 struct cb_devicenotifyargs *args)
295 {
296 __be32 *p;
297 __be32 status = 0;
298 u32 tmp;
299 int n, i;
300 args->ndevs = 0;
301
302 /* Num of device notifications */
303 p = read_buf(xdr, sizeof(uint32_t));
304 if (unlikely(p == NULL)) {
305 status = htonl(NFS4ERR_BADXDR);
306 goto out;
307 }
308 n = ntohl(*p++);
309 if (n <= 0)
310 goto out;
311 if (n > ULONG_MAX / sizeof(*args->devs)) {
312 status = htonl(NFS4ERR_BADXDR);
313 goto out;
314 }
315
316 args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL);
317 if (!args->devs) {
318 status = htonl(NFS4ERR_DELAY);
319 goto out;
320 }
321
322 /* Decode each dev notification */
323 for (i = 0; i < n; i++) {
324 struct cb_devicenotifyitem *dev = &args->devs[i];
325
326 p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE);
327 if (unlikely(p == NULL)) {
328 status = htonl(NFS4ERR_BADXDR);
329 goto err;
330 }
331
332 tmp = ntohl(*p++); /* bitmap size */
333 if (tmp != 1) {
334 status = htonl(NFS4ERR_INVAL);
335 goto err;
336 }
337 dev->cbd_notify_type = ntohl(*p++);
338 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE &&
339 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) {
340 status = htonl(NFS4ERR_INVAL);
341 goto err;
342 }
343
344 tmp = ntohl(*p++); /* opaque size */
345 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) &&
346 (tmp != NFS4_DEVICEID4_SIZE + 8)) ||
347 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) &&
348 (tmp != NFS4_DEVICEID4_SIZE + 4))) {
349 status = htonl(NFS4ERR_INVAL);
350 goto err;
351 }
352 dev->cbd_layout_type = ntohl(*p++);
353 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE);
354 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
355
356 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
357 p = read_buf(xdr, sizeof(uint32_t));
358 if (unlikely(p == NULL)) {
359 status = htonl(NFS4ERR_BADXDR);
360 goto err;
361 }
362 dev->cbd_immediate = ntohl(*p++);
363 } else {
364 dev->cbd_immediate = 0;
365 }
366
367 args->ndevs++;
368
369 dprintk("%s: type %d layout 0x%x immediate %d\n",
370 __func__, dev->cbd_notify_type, dev->cbd_layout_type,
371 dev->cbd_immediate);
372 }
373 out:
374 dprintk("%s: status %d ndevs %d\n",
375 __func__, ntohl(status), args->ndevs);
376 return status;
377 err:
378 kfree(args->devs);
379 goto out;
380 }
381
382 static __be32 decode_sessionid(struct xdr_stream *xdr,
383 struct nfs4_sessionid *sid)
384 {
385 __be32 *p;
386 int len = NFS4_MAX_SESSIONID_LEN;
387
388 p = read_buf(xdr, len);
389 if (unlikely(p == NULL))
390 return htonl(NFS4ERR_RESOURCE);
391
392 memcpy(sid->data, p, len);
393 return 0;
394 }
395
396 static __be32 decode_rc_list(struct xdr_stream *xdr,
397 struct referring_call_list *rc_list)
398 {
399 __be32 *p;
400 int i;
401 __be32 status;
402
403 status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
404 if (status)
405 goto out;
406
407 status = htonl(NFS4ERR_RESOURCE);
408 p = read_buf(xdr, sizeof(uint32_t));
409 if (unlikely(p == NULL))
410 goto out;
411
412 rc_list->rcl_nrefcalls = ntohl(*p++);
413 if (rc_list->rcl_nrefcalls) {
414 p = read_buf(xdr,
415 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
416 if (unlikely(p == NULL))
417 goto out;
418 rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls,
419 sizeof(*rc_list->rcl_refcalls),
420 GFP_KERNEL);
421 if (unlikely(rc_list->rcl_refcalls == NULL))
422 goto out;
423 for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
424 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
425 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
426 }
427 }
428 status = 0;
429
430 out:
431 return status;
432 }
433
434 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
435 struct xdr_stream *xdr,
436 struct cb_sequenceargs *args)
437 {
438 __be32 *p;
439 int i;
440 __be32 status;
441
442 status = decode_sessionid(xdr, &args->csa_sessionid);
443 if (status)
444 goto out;
445
446 status = htonl(NFS4ERR_RESOURCE);
447 p = read_buf(xdr, 5 * sizeof(uint32_t));
448 if (unlikely(p == NULL))
449 goto out;
450
451 args->csa_addr = svc_addr(rqstp);
452 args->csa_sequenceid = ntohl(*p++);
453 args->csa_slotid = ntohl(*p++);
454 args->csa_highestslotid = ntohl(*p++);
455 args->csa_cachethis = ntohl(*p++);
456 args->csa_nrclists = ntohl(*p++);
457 args->csa_rclists = NULL;
458 if (args->csa_nrclists) {
459 args->csa_rclists = kmalloc_array(args->csa_nrclists,
460 sizeof(*args->csa_rclists),
461 GFP_KERNEL);
462 if (unlikely(args->csa_rclists == NULL))
463 goto out;
464
465 for (i = 0; i < args->csa_nrclists; i++) {
466 status = decode_rc_list(xdr, &args->csa_rclists[i]);
467 if (status) {
468 args->csa_nrclists = i;
469 goto out_free;
470 }
471 }
472 }
473 status = 0;
474
475 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u "
476 "highestslotid %u cachethis %d nrclists %u\n",
477 __func__,
478 ((u32 *)&args->csa_sessionid)[0],
479 ((u32 *)&args->csa_sessionid)[1],
480 ((u32 *)&args->csa_sessionid)[2],
481 ((u32 *)&args->csa_sessionid)[3],
482 args->csa_sequenceid, args->csa_slotid,
483 args->csa_highestslotid, args->csa_cachethis,
484 args->csa_nrclists);
485 out:
486 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
487 return status;
488
489 out_free:
490 for (i = 0; i < args->csa_nrclists; i++)
491 kfree(args->csa_rclists[i].rcl_refcalls);
492 kfree(args->csa_rclists);
493 goto out;
494 }
495
496 static __be32 decode_recallany_args(struct svc_rqst *rqstp,
497 struct xdr_stream *xdr,
498 struct cb_recallanyargs *args)
499 {
500 uint32_t bitmap[2];
501 __be32 *p, status;
502
503 args->craa_addr = svc_addr(rqstp);
504 p = read_buf(xdr, 4);
505 if (unlikely(p == NULL))
506 return htonl(NFS4ERR_BADXDR);
507 args->craa_objs_to_keep = ntohl(*p++);
508 status = decode_bitmap(xdr, bitmap);
509 if (unlikely(status))
510 return status;
511 args->craa_type_mask = bitmap[0];
512
513 return 0;
514 }
515
516 static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
517 struct xdr_stream *xdr,
518 struct cb_recallslotargs *args)
519 {
520 __be32 *p;
521
522 args->crsa_addr = svc_addr(rqstp);
523 p = read_buf(xdr, 4);
524 if (unlikely(p == NULL))
525 return htonl(NFS4ERR_BADXDR);
526 args->crsa_target_highest_slotid = ntohl(*p++);
527 return 0;
528 }
529
530 #endif /* CONFIG_NFS_V4_1 */
531
532 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
533 {
534 __be32 *p;
535
536 p = xdr_reserve_space(xdr, 4 + len);
537 if (unlikely(p == NULL))
538 return htonl(NFS4ERR_RESOURCE);
539 xdr_encode_opaque(p, str, len);
540 return 0;
541 }
542
543 #define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE)
544 #define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY)
545 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep)
546 {
547 __be32 bm[2];
548 __be32 *p;
549
550 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0);
551 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1);
552 if (bm[1] != 0) {
553 p = xdr_reserve_space(xdr, 16);
554 if (unlikely(p == NULL))
555 return htonl(NFS4ERR_RESOURCE);
556 *p++ = htonl(2);
557 *p++ = bm[0];
558 *p++ = bm[1];
559 } else if (bm[0] != 0) {
560 p = xdr_reserve_space(xdr, 12);
561 if (unlikely(p == NULL))
562 return htonl(NFS4ERR_RESOURCE);
563 *p++ = htonl(1);
564 *p++ = bm[0];
565 } else {
566 p = xdr_reserve_space(xdr, 8);
567 if (unlikely(p == NULL))
568 return htonl(NFS4ERR_RESOURCE);
569 *p++ = htonl(0);
570 }
571 *savep = p;
572 return 0;
573 }
574
575 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
576 {
577 __be32 *p;
578
579 if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
580 return 0;
581 p = xdr_reserve_space(xdr, 8);
582 if (unlikely(!p))
583 return htonl(NFS4ERR_RESOURCE);
584 p = xdr_encode_hyper(p, change);
585 return 0;
586 }
587
588 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
589 {
590 __be32 *p;
591
592 if (!(bitmap[0] & FATTR4_WORD0_SIZE))
593 return 0;
594 p = xdr_reserve_space(xdr, 8);
595 if (unlikely(!p))
596 return htonl(NFS4ERR_RESOURCE);
597 p = xdr_encode_hyper(p, size);
598 return 0;
599 }
600
601 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
602 {
603 __be32 *p;
604
605 p = xdr_reserve_space(xdr, 12);
606 if (unlikely(!p))
607 return htonl(NFS4ERR_RESOURCE);
608 p = xdr_encode_hyper(p, time->tv_sec);
609 *p = htonl(time->tv_nsec);
610 return 0;
611 }
612
613 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
614 {
615 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
616 return 0;
617 return encode_attr_time(xdr,time);
618 }
619
620 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
621 {
622 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
623 return 0;
624 return encode_attr_time(xdr,time);
625 }
626
627 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
628 {
629 __be32 status;
630
631 hdr->status = xdr_reserve_space(xdr, 4);
632 if (unlikely(hdr->status == NULL))
633 return htonl(NFS4ERR_RESOURCE);
634 status = encode_string(xdr, hdr->taglen, hdr->tag);
635 if (unlikely(status != 0))
636 return status;
637 hdr->nops = xdr_reserve_space(xdr, 4);
638 if (unlikely(hdr->nops == NULL))
639 return htonl(NFS4ERR_RESOURCE);
640 return 0;
641 }
642
643 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
644 {
645 __be32 *p;
646
647 p = xdr_reserve_space(xdr, 8);
648 if (unlikely(p == NULL))
649 return htonl(NFS4ERR_RESOURCE_HDR);
650 *p++ = htonl(op);
651 *p = res;
652 return 0;
653 }
654
655 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res)
656 {
657 __be32 *savep = NULL;
658 __be32 status = res->status;
659
660 if (unlikely(status != 0))
661 goto out;
662 status = encode_attr_bitmap(xdr, res->bitmap, &savep);
663 if (unlikely(status != 0))
664 goto out;
665 status = encode_attr_change(xdr, res->bitmap, res->change_attr);
666 if (unlikely(status != 0))
667 goto out;
668 status = encode_attr_size(xdr, res->bitmap, res->size);
669 if (unlikely(status != 0))
670 goto out;
671 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
672 if (unlikely(status != 0))
673 goto out;
674 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
675 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
676 out:
677 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
678 return status;
679 }
680
681 #if defined(CONFIG_NFS_V4_1)
682
683 static __be32 encode_sessionid(struct xdr_stream *xdr,
684 const struct nfs4_sessionid *sid)
685 {
686 __be32 *p;
687 int len = NFS4_MAX_SESSIONID_LEN;
688
689 p = xdr_reserve_space(xdr, len);
690 if (unlikely(p == NULL))
691 return htonl(NFS4ERR_RESOURCE);
692
693 memcpy(p, sid, len);
694 return 0;
695 }
696
697 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
698 struct xdr_stream *xdr,
699 const struct cb_sequenceres *res)
700 {
701 __be32 *p;
702 __be32 status = res->csr_status;
703
704 if (unlikely(status != 0))
705 goto out;
706
707 encode_sessionid(xdr, &res->csr_sessionid);
708
709 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
710 if (unlikely(p == NULL))
711 return htonl(NFS4ERR_RESOURCE);
712
713 *p++ = htonl(res->csr_sequenceid);
714 *p++ = htonl(res->csr_slotid);
715 *p++ = htonl(res->csr_highestslotid);
716 *p++ = htonl(res->csr_target_highestslotid);
717 out:
718 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
719 return status;
720 }
721
722 static __be32
723 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
724 {
725 if (op_nr == OP_CB_SEQUENCE) {
726 if (nop != 0)
727 return htonl(NFS4ERR_SEQUENCE_POS);
728 } else {
729 if (nop == 0)
730 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
731 }
732
733 switch (op_nr) {
734 case OP_CB_GETATTR:
735 case OP_CB_RECALL:
736 case OP_CB_SEQUENCE:
737 case OP_CB_RECALL_ANY:
738 case OP_CB_RECALL_SLOT:
739 case OP_CB_LAYOUTRECALL:
740 case OP_CB_NOTIFY_DEVICEID:
741 *op = &callback_ops[op_nr];
742 break;
743
744 case OP_CB_NOTIFY:
745 case OP_CB_PUSH_DELEG:
746 case OP_CB_RECALLABLE_OBJ_AVAIL:
747 case OP_CB_WANTS_CANCELLED:
748 case OP_CB_NOTIFY_LOCK:
749 return htonl(NFS4ERR_NOTSUPP);
750
751 default:
752 return htonl(NFS4ERR_OP_ILLEGAL);
753 }
754
755 return htonl(NFS_OK);
756 }
757
758 static void nfs4_callback_free_slot(struct nfs4_session *session)
759 {
760 struct nfs4_slot_table *tbl = &session->bc_slot_table;
761
762 spin_lock(&tbl->slot_tbl_lock);
763 /*
764 * Let the state manager know callback processing done.
765 * A single slot, so highest used slotid is either 0 or -1
766 */
767 tbl->highest_used_slotid = NFS4_NO_SLOT;
768 nfs4_slot_tbl_drain_complete(tbl);
769 spin_unlock(&tbl->slot_tbl_lock);
770 }
771
772 static void nfs4_cb_free_slot(struct cb_process_state *cps)
773 {
774 if (cps->slotid != NFS4_NO_SLOT)
775 nfs4_callback_free_slot(cps->clp->cl_session);
776 }
777
778 #else /* CONFIG_NFS_V4_1 */
779
780 static __be32
781 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
782 {
783 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
784 }
785
786 static void nfs4_cb_free_slot(struct cb_process_state *cps)
787 {
788 }
789 #endif /* CONFIG_NFS_V4_1 */
790
791 #ifdef CONFIG_NFS_V4_2
792 static __be32
793 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
794 {
795 __be32 status = preprocess_nfs41_op(nop, op_nr, op);
796 if (status != htonl(NFS4ERR_OP_ILLEGAL))
797 return status;
798
799 if (op_nr == OP_CB_OFFLOAD)
800 return htonl(NFS4ERR_NOTSUPP);
801 return htonl(NFS4ERR_OP_ILLEGAL);
802 }
803 #else /* CONFIG_NFS_V4_2 */
804 static __be32
805 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
806 {
807 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
808 }
809 #endif /* CONFIG_NFS_V4_2 */
810
811 static __be32
812 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
813 {
814 switch (op_nr) {
815 case OP_CB_GETATTR:
816 case OP_CB_RECALL:
817 *op = &callback_ops[op_nr];
818 break;
819 default:
820 return htonl(NFS4ERR_OP_ILLEGAL);
821 }
822
823 return htonl(NFS_OK);
824 }
825
826 static __be32 process_op(int nop, struct svc_rqst *rqstp,
827 struct xdr_stream *xdr_in, void *argp,
828 struct xdr_stream *xdr_out, void *resp,
829 struct cb_process_state *cps)
830 {
831 struct callback_op *op = &callback_ops[0];
832 unsigned int op_nr;
833 __be32 status;
834 long maxlen;
835 __be32 res;
836
837 dprintk("%s: start\n", __func__);
838 status = decode_op_hdr(xdr_in, &op_nr);
839 if (unlikely(status))
840 return status;
841
842 dprintk("%s: minorversion=%d nop=%d op_nr=%u\n",
843 __func__, cps->minorversion, nop, op_nr);
844
845 switch (cps->minorversion) {
846 case 0:
847 status = preprocess_nfs4_op(op_nr, &op);
848 break;
849 case 1:
850 status = preprocess_nfs41_op(nop, op_nr, &op);
851 break;
852 case 2:
853 status = preprocess_nfs42_op(nop, op_nr, &op);
854 break;
855 default:
856 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH);
857 }
858
859 if (status == htonl(NFS4ERR_OP_ILLEGAL))
860 op_nr = OP_CB_ILLEGAL;
861 if (status)
862 goto encode_hdr;
863
864 if (cps->drc_status) {
865 status = cps->drc_status;
866 goto encode_hdr;
867 }
868
869 maxlen = xdr_out->end - xdr_out->p;
870 if (maxlen > 0 && maxlen < PAGE_SIZE) {
871 status = op->decode_args(rqstp, xdr_in, argp);
872 if (likely(status == 0))
873 status = op->process_op(argp, resp, cps);
874 } else
875 status = htonl(NFS4ERR_RESOURCE);
876
877 encode_hdr:
878 res = encode_op_hdr(xdr_out, op_nr, status);
879 if (unlikely(res))
880 return res;
881 if (op->encode_res != NULL && status == 0)
882 status = op->encode_res(rqstp, xdr_out, resp);
883 dprintk("%s: done, status = %d\n", __func__, ntohl(status));
884 return status;
885 }
886
887 /*
888 * Decode, process and encode a COMPOUND
889 */
890 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp)
891 {
892 struct cb_compound_hdr_arg hdr_arg = { 0 };
893 struct cb_compound_hdr_res hdr_res = { NULL };
894 struct xdr_stream xdr_in, xdr_out;
895 __be32 *p, status;
896 struct cb_process_state cps = {
897 .drc_status = 0,
898 .clp = NULL,
899 .slotid = NFS4_NO_SLOT,
900 .net = SVC_NET(rqstp),
901 };
902 unsigned int nops = 0;
903
904 dprintk("%s: start\n", __func__);
905
906 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
907
908 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
909 xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
910
911 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
912 if (status == htonl(NFS4ERR_RESOURCE))
913 return rpc_garbage_args;
914
915 if (hdr_arg.minorversion == 0) {
916 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident);
917 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp))
918 return rpc_drop_reply;
919 }
920
921 cps.minorversion = hdr_arg.minorversion;
922 hdr_res.taglen = hdr_arg.taglen;
923 hdr_res.tag = hdr_arg.tag;
924 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0)
925 return rpc_system_err;
926
927 while (status == 0 && nops != hdr_arg.nops) {
928 status = process_op(nops, rqstp, &xdr_in,
929 argp, &xdr_out, resp, &cps);
930 nops++;
931 }
932
933 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
934 * resource error in cb_compound status without returning op */
935 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
936 status = htonl(NFS4ERR_RESOURCE);
937 nops--;
938 }
939
940 *hdr_res.status = status;
941 *hdr_res.nops = htonl(nops);
942 nfs4_cb_free_slot(&cps);
943 nfs_put_client(cps.clp);
944 dprintk("%s: done, status = %u\n", __func__, ntohl(status));
945 return rpc_success;
946 }
947
948 /*
949 * Define NFS4 callback COMPOUND ops.
950 */
951 static struct callback_op callback_ops[] = {
952 [0] = {
953 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
954 },
955 [OP_CB_GETATTR] = {
956 .process_op = (callback_process_op_t)nfs4_callback_getattr,
957 .decode_args = (callback_decode_arg_t)decode_getattr_args,
958 .encode_res = (callback_encode_res_t)encode_getattr_res,
959 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
960 },
961 [OP_CB_RECALL] = {
962 .process_op = (callback_process_op_t)nfs4_callback_recall,
963 .decode_args = (callback_decode_arg_t)decode_recall_args,
964 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
965 },
966 #if defined(CONFIG_NFS_V4_1)
967 [OP_CB_LAYOUTRECALL] = {
968 .process_op = (callback_process_op_t)nfs4_callback_layoutrecall,
969 .decode_args =
970 (callback_decode_arg_t)decode_layoutrecall_args,
971 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
972 },
973 [OP_CB_NOTIFY_DEVICEID] = {
974 .process_op = (callback_process_op_t)nfs4_callback_devicenotify,
975 .decode_args =
976 (callback_decode_arg_t)decode_devicenotify_args,
977 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
978 },
979 [OP_CB_SEQUENCE] = {
980 .process_op = (callback_process_op_t)nfs4_callback_sequence,
981 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args,
982 .encode_res = (callback_encode_res_t)encode_cb_sequence_res,
983 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
984 },
985 [OP_CB_RECALL_ANY] = {
986 .process_op = (callback_process_op_t)nfs4_callback_recallany,
987 .decode_args = (callback_decode_arg_t)decode_recallany_args,
988 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
989 },
990 [OP_CB_RECALL_SLOT] = {
991 .process_op = (callback_process_op_t)nfs4_callback_recallslot,
992 .decode_args = (callback_decode_arg_t)decode_recallslot_args,
993 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
994 },
995 #endif /* CONFIG_NFS_V4_1 */
996 };
997
998 /*
999 * Define NFS4 callback procedures
1000 */
1001 static struct svc_procedure nfs4_callback_procedures1[] = {
1002 [CB_NULL] = {
1003 .pc_func = nfs4_callback_null,
1004 .pc_decode = (kxdrproc_t)nfs4_decode_void,
1005 .pc_encode = (kxdrproc_t)nfs4_encode_void,
1006 .pc_xdrressize = 1,
1007 },
1008 [CB_COMPOUND] = {
1009 .pc_func = nfs4_callback_compound,
1010 .pc_encode = (kxdrproc_t)nfs4_encode_void,
1011 .pc_argsize = 256,
1012 .pc_ressize = 256,
1013 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
1014 }
1015 };
1016
1017 struct svc_version nfs4_callback_version1 = {
1018 .vs_vers = 1,
1019 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1020 .vs_proc = nfs4_callback_procedures1,
1021 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1022 .vs_dispatch = NULL,
1023 .vs_hidden = 1,
1024 };
1025
1026 struct svc_version nfs4_callback_version4 = {
1027 .vs_vers = 4,
1028 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1029 .vs_proc = nfs4_callback_procedures1,
1030 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1031 .vs_dispatch = NULL,
1032 .vs_hidden = 1,
1033 };
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