2 * linux/fs/nfs/callback_xdr.c
4 * Copyright (C) 2004 Trond Myklebust
6 * NFSv4 callback encode/decode procedures
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>
20 #define CB_OP_TAGLEN_MAXSZ (512)
21 #define CB_OP_HDR_RES_MAXSZ (2 + CB_OP_TAGLEN_MAXSZ)
22 #define CB_OP_GETATTR_BITMAP_MAXSZ (4)
23 #define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
24 CB_OP_GETATTR_BITMAP_MAXSZ + \
26 #define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
28 #if defined(CONFIG_NFS_V4_1)
29 #define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
30 #define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
31 #define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
33 #define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
34 #define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
35 #endif /* CONFIG_NFS_V4_1 */
37 #define NFSDBG_FACILITY NFSDBG_CALLBACK
39 /* Internal error code */
40 #define NFS4ERR_RESOURCE_HDR 11050
42 typedef __be32 (*callback_process_op_t)(void *, void *,
43 struct cb_process_state *);
44 typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *);
45 typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *);
49 callback_process_op_t process_op;
50 callback_decode_arg_t decode_args;
51 callback_encode_res_t encode_res;
55 static struct callback_op callback_ops[];
57 static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp)
59 return htonl(NFS4_OK);
62 static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
64 return xdr_argsize_check(rqstp, p);
67 static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
69 return xdr_ressize_check(rqstp, p);
72 static __be32 *read_buf(struct xdr_stream *xdr, int nbytes)
76 p = xdr_inline_decode(xdr, nbytes);
77 if (unlikely(p == NULL))
78 printk(KERN_WARNING "NFSv4 callback reply buffer overflowed!\n");
82 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str)
87 if (unlikely(p == NULL))
88 return htonl(NFS4ERR_RESOURCE);
92 p = read_buf(xdr, *len);
93 if (unlikely(p == NULL))
94 return htonl(NFS4ERR_RESOURCE);
95 *str = (const char *)p;
102 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
106 p = read_buf(xdr, 4);
107 if (unlikely(p == NULL))
108 return htonl(NFS4ERR_RESOURCE);
109 fh->size = ntohl(*p);
110 if (fh->size > NFS4_FHSIZE)
111 return htonl(NFS4ERR_BADHANDLE);
112 p = read_buf(xdr, fh->size);
113 if (unlikely(p == NULL))
114 return htonl(NFS4ERR_RESOURCE);
115 memcpy(&fh->data[0], p, fh->size);
116 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
120 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
123 unsigned int attrlen;
125 p = read_buf(xdr, 4);
126 if (unlikely(p == NULL))
127 return htonl(NFS4ERR_RESOURCE);
129 p = read_buf(xdr, attrlen << 2);
130 if (unlikely(p == NULL))
131 return htonl(NFS4ERR_RESOURCE);
132 if (likely(attrlen > 0))
133 bitmap[0] = ntohl(*p++);
135 bitmap[1] = ntohl(*p);
139 static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
143 p = read_buf(xdr, 16);
144 if (unlikely(p == NULL))
145 return htonl(NFS4ERR_RESOURCE);
146 memcpy(stateid->data, p, 16);
150 static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
155 status = decode_string(xdr, &hdr->taglen, &hdr->tag);
156 if (unlikely(status != 0))
158 /* We do not like overly long tags! */
159 if (hdr->taglen > CB_OP_TAGLEN_MAXSZ - 12) {
160 printk("NFSv4 CALLBACK %s: client sent tag of length %u\n",
161 __func__, hdr->taglen);
162 return htonl(NFS4ERR_RESOURCE);
164 p = read_buf(xdr, 12);
165 if (unlikely(p == NULL))
166 return htonl(NFS4ERR_RESOURCE);
167 hdr->minorversion = ntohl(*p++);
168 /* Check minor version is zero or one. */
169 if (hdr->minorversion <= 1) {
170 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 */
172 pr_warn_ratelimited("NFS: %s: NFSv4 server callback with "
173 "illegal minor version %u!\n",
174 __func__, hdr->minorversion);
175 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
177 hdr->nops = ntohl(*p);
178 dprintk("%s: minorversion %d nops %d\n", __func__,
179 hdr->minorversion, hdr->nops);
183 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
186 p = read_buf(xdr, 4);
187 if (unlikely(p == NULL))
188 return htonl(NFS4ERR_RESOURCE_HDR);
193 static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args)
197 status = decode_fh(xdr, &args->fh);
198 if (unlikely(status != 0))
200 args->addr = svc_addr(rqstp);
201 status = decode_bitmap(xdr, args->bitmap);
203 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
207 static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args)
212 args->addr = svc_addr(rqstp);
213 status = decode_stateid(xdr, &args->stateid);
214 if (unlikely(status != 0))
216 p = read_buf(xdr, 4);
217 if (unlikely(p == NULL)) {
218 status = htonl(NFS4ERR_RESOURCE);
221 args->truncate = ntohl(*p);
222 status = decode_fh(xdr, &args->fh);
224 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
228 #if defined(CONFIG_NFS_V4_1)
230 static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
231 struct xdr_stream *xdr,
232 struct cb_layoutrecallargs *args)
238 args->cbl_addr = svc_addr(rqstp);
239 p = read_buf(xdr, 4 * sizeof(uint32_t));
240 if (unlikely(p == NULL)) {
241 status = htonl(NFS4ERR_BADXDR);
245 args->cbl_layout_type = ntohl(*p++);
246 /* Depite the spec's xdr, iomode really belongs in the FILE switch,
247 * as it is unusable and ignored with the other types.
249 iomode = ntohl(*p++);
250 args->cbl_layoutchanged = ntohl(*p++);
251 args->cbl_recall_type = ntohl(*p++);
253 if (args->cbl_recall_type == RETURN_FILE) {
254 args->cbl_range.iomode = iomode;
255 status = decode_fh(xdr, &args->cbl_fh);
256 if (unlikely(status != 0))
259 p = read_buf(xdr, 2 * sizeof(uint64_t));
260 if (unlikely(p == NULL)) {
261 status = htonl(NFS4ERR_BADXDR);
264 p = xdr_decode_hyper(p, &args->cbl_range.offset);
265 p = xdr_decode_hyper(p, &args->cbl_range.length);
266 status = decode_stateid(xdr, &args->cbl_stateid);
267 if (unlikely(status != 0))
269 } else if (args->cbl_recall_type == RETURN_FSID) {
270 p = read_buf(xdr, 2 * sizeof(uint64_t));
271 if (unlikely(p == NULL)) {
272 status = htonl(NFS4ERR_BADXDR);
275 p = xdr_decode_hyper(p, &args->cbl_fsid.major);
276 p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
277 } else if (args->cbl_recall_type != RETURN_ALL) {
278 status = htonl(NFS4ERR_BADXDR);
281 dprintk("%s: ltype 0x%x iomode %d changed %d recall_type %d\n",
283 args->cbl_layout_type, iomode,
284 args->cbl_layoutchanged, args->cbl_recall_type);
286 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
291 __be32 decode_devicenotify_args(struct svc_rqst *rqstp,
292 struct xdr_stream *xdr,
293 struct cb_devicenotifyargs *args)
301 /* Num of device notifications */
302 p = read_buf(xdr, sizeof(uint32_t));
303 if (unlikely(p == NULL)) {
304 status = htonl(NFS4ERR_BADXDR);
311 args->devs = kmalloc(n * sizeof(*args->devs), GFP_KERNEL);
313 status = htonl(NFS4ERR_DELAY);
317 /* Decode each dev notification */
318 for (i = 0; i < n; i++) {
319 struct cb_devicenotifyitem *dev = &args->devs[i];
321 p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE);
322 if (unlikely(p == NULL)) {
323 status = htonl(NFS4ERR_BADXDR);
327 tmp = ntohl(*p++); /* bitmap size */
329 status = htonl(NFS4ERR_INVAL);
332 dev->cbd_notify_type = ntohl(*p++);
333 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE &&
334 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) {
335 status = htonl(NFS4ERR_INVAL);
339 tmp = ntohl(*p++); /* opaque size */
340 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) &&
341 (tmp != NFS4_DEVICEID4_SIZE + 8)) ||
342 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) &&
343 (tmp != NFS4_DEVICEID4_SIZE + 4))) {
344 status = htonl(NFS4ERR_INVAL);
347 dev->cbd_layout_type = ntohl(*p++);
348 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE);
349 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
351 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
352 p = read_buf(xdr, sizeof(uint32_t));
353 if (unlikely(p == NULL)) {
354 status = htonl(NFS4ERR_BADXDR);
357 dev->cbd_immediate = ntohl(*p++);
359 dev->cbd_immediate = 0;
364 dprintk("%s: type %d layout 0x%x immediate %d\n",
365 __func__, dev->cbd_notify_type, dev->cbd_layout_type,
369 dprintk("%s: status %d ndevs %d\n",
370 __func__, ntohl(status), args->ndevs);
377 static __be32 decode_sessionid(struct xdr_stream *xdr,
378 struct nfs4_sessionid *sid)
381 int len = NFS4_MAX_SESSIONID_LEN;
383 p = read_buf(xdr, len);
384 if (unlikely(p == NULL))
385 return htonl(NFS4ERR_RESOURCE);
387 memcpy(sid->data, p, len);
391 static __be32 decode_rc_list(struct xdr_stream *xdr,
392 struct referring_call_list *rc_list)
398 status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
402 status = htonl(NFS4ERR_RESOURCE);
403 p = read_buf(xdr, sizeof(uint32_t));
404 if (unlikely(p == NULL))
407 rc_list->rcl_nrefcalls = ntohl(*p++);
408 if (rc_list->rcl_nrefcalls) {
410 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
411 if (unlikely(p == NULL))
413 rc_list->rcl_refcalls = kmalloc(rc_list->rcl_nrefcalls *
414 sizeof(*rc_list->rcl_refcalls),
416 if (unlikely(rc_list->rcl_refcalls == NULL))
418 for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
419 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
420 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
429 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
430 struct xdr_stream *xdr,
431 struct cb_sequenceargs *args)
437 status = decode_sessionid(xdr, &args->csa_sessionid);
441 status = htonl(NFS4ERR_RESOURCE);
442 p = read_buf(xdr, 5 * sizeof(uint32_t));
443 if (unlikely(p == NULL))
446 args->csa_addr = svc_addr(rqstp);
447 args->csa_sequenceid = ntohl(*p++);
448 args->csa_slotid = ntohl(*p++);
449 args->csa_highestslotid = ntohl(*p++);
450 args->csa_cachethis = ntohl(*p++);
451 args->csa_nrclists = ntohl(*p++);
452 args->csa_rclists = NULL;
453 if (args->csa_nrclists) {
454 args->csa_rclists = kmalloc(args->csa_nrclists *
455 sizeof(*args->csa_rclists),
457 if (unlikely(args->csa_rclists == NULL))
460 for (i = 0; i < args->csa_nrclists; i++) {
461 status = decode_rc_list(xdr, &args->csa_rclists[i]);
468 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u "
469 "highestslotid %u cachethis %d nrclists %u\n",
471 ((u32 *)&args->csa_sessionid)[0],
472 ((u32 *)&args->csa_sessionid)[1],
473 ((u32 *)&args->csa_sessionid)[2],
474 ((u32 *)&args->csa_sessionid)[3],
475 args->csa_sequenceid, args->csa_slotid,
476 args->csa_highestslotid, args->csa_cachethis,
479 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
483 for (i = 0; i < args->csa_nrclists; i++)
484 kfree(args->csa_rclists[i].rcl_refcalls);
485 kfree(args->csa_rclists);
489 static __be32 decode_recallany_args(struct svc_rqst *rqstp,
490 struct xdr_stream *xdr,
491 struct cb_recallanyargs *args)
496 args->craa_addr = svc_addr(rqstp);
497 p = read_buf(xdr, 4);
498 if (unlikely(p == NULL))
499 return htonl(NFS4ERR_BADXDR);
500 args->craa_objs_to_keep = ntohl(*p++);
501 status = decode_bitmap(xdr, bitmap);
502 if (unlikely(status))
504 args->craa_type_mask = bitmap[0];
509 static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
510 struct xdr_stream *xdr,
511 struct cb_recallslotargs *args)
515 args->crsa_addr = svc_addr(rqstp);
516 p = read_buf(xdr, 4);
517 if (unlikely(p == NULL))
518 return htonl(NFS4ERR_BADXDR);
519 args->crsa_target_max_slots = ntohl(*p++);
523 #endif /* CONFIG_NFS_V4_1 */
525 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
529 p = xdr_reserve_space(xdr, 4 + len);
530 if (unlikely(p == NULL))
531 return htonl(NFS4ERR_RESOURCE);
532 xdr_encode_opaque(p, str, len);
536 #define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE)
537 #define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY)
538 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep)
543 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0);
544 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1);
546 p = xdr_reserve_space(xdr, 16);
547 if (unlikely(p == NULL))
548 return htonl(NFS4ERR_RESOURCE);
552 } else if (bm[0] != 0) {
553 p = xdr_reserve_space(xdr, 12);
554 if (unlikely(p == NULL))
555 return htonl(NFS4ERR_RESOURCE);
559 p = xdr_reserve_space(xdr, 8);
560 if (unlikely(p == NULL))
561 return htonl(NFS4ERR_RESOURCE);
568 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
572 if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
574 p = xdr_reserve_space(xdr, 8);
576 return htonl(NFS4ERR_RESOURCE);
577 p = xdr_encode_hyper(p, change);
581 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
585 if (!(bitmap[0] & FATTR4_WORD0_SIZE))
587 p = xdr_reserve_space(xdr, 8);
589 return htonl(NFS4ERR_RESOURCE);
590 p = xdr_encode_hyper(p, size);
594 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
598 p = xdr_reserve_space(xdr, 12);
600 return htonl(NFS4ERR_RESOURCE);
601 p = xdr_encode_hyper(p, time->tv_sec);
602 *p = htonl(time->tv_nsec);
606 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
608 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
610 return encode_attr_time(xdr,time);
613 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
615 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
617 return encode_attr_time(xdr,time);
620 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
624 hdr->status = xdr_reserve_space(xdr, 4);
625 if (unlikely(hdr->status == NULL))
626 return htonl(NFS4ERR_RESOURCE);
627 status = encode_string(xdr, hdr->taglen, hdr->tag);
628 if (unlikely(status != 0))
630 hdr->nops = xdr_reserve_space(xdr, 4);
631 if (unlikely(hdr->nops == NULL))
632 return htonl(NFS4ERR_RESOURCE);
636 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
640 p = xdr_reserve_space(xdr, 8);
641 if (unlikely(p == NULL))
642 return htonl(NFS4ERR_RESOURCE_HDR);
648 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res)
650 __be32 *savep = NULL;
651 __be32 status = res->status;
653 if (unlikely(status != 0))
655 status = encode_attr_bitmap(xdr, res->bitmap, &savep);
656 if (unlikely(status != 0))
658 status = encode_attr_change(xdr, res->bitmap, res->change_attr);
659 if (unlikely(status != 0))
661 status = encode_attr_size(xdr, res->bitmap, res->size);
662 if (unlikely(status != 0))
664 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
665 if (unlikely(status != 0))
667 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
668 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
670 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
674 #if defined(CONFIG_NFS_V4_1)
676 static __be32 encode_sessionid(struct xdr_stream *xdr,
677 const struct nfs4_sessionid *sid)
680 int len = NFS4_MAX_SESSIONID_LEN;
682 p = xdr_reserve_space(xdr, len);
683 if (unlikely(p == NULL))
684 return htonl(NFS4ERR_RESOURCE);
690 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
691 struct xdr_stream *xdr,
692 const struct cb_sequenceres *res)
695 unsigned status = res->csr_status;
697 if (unlikely(status != 0))
700 encode_sessionid(xdr, &res->csr_sessionid);
702 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
703 if (unlikely(p == NULL))
704 return htonl(NFS4ERR_RESOURCE);
706 *p++ = htonl(res->csr_sequenceid);
707 *p++ = htonl(res->csr_slotid);
708 *p++ = htonl(res->csr_highestslotid);
709 *p++ = htonl(res->csr_target_highestslotid);
711 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
716 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
718 if (op_nr == OP_CB_SEQUENCE) {
720 return htonl(NFS4ERR_SEQUENCE_POS);
723 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
730 case OP_CB_RECALL_ANY:
731 case OP_CB_RECALL_SLOT:
732 case OP_CB_LAYOUTRECALL:
733 case OP_CB_NOTIFY_DEVICEID:
734 *op = &callback_ops[op_nr];
738 case OP_CB_PUSH_DELEG:
739 case OP_CB_RECALLABLE_OBJ_AVAIL:
740 case OP_CB_WANTS_CANCELLED:
741 case OP_CB_NOTIFY_LOCK:
742 return htonl(NFS4ERR_NOTSUPP);
745 return htonl(NFS4ERR_OP_ILLEGAL);
748 return htonl(NFS_OK);
751 static void nfs4_callback_free_slot(struct nfs4_session *session)
753 struct nfs4_slot_table *tbl = &session->bc_slot_table;
755 spin_lock(&tbl->slot_tbl_lock);
757 * Let the state manager know callback processing done.
758 * A single slot, so highest used slotid is either 0 or -1
760 tbl->highest_used_slotid = -1;
761 nfs4_check_drain_bc_complete(session);
762 spin_unlock(&tbl->slot_tbl_lock);
765 static void nfs4_cb_free_slot(struct cb_process_state *cps)
767 if (cps->slotid != -1)
768 nfs4_callback_free_slot(cps->clp->cl_session);
771 #else /* CONFIG_NFS_V4_1 */
774 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
776 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
779 static void nfs4_cb_free_slot(struct cb_process_state *cps)
782 #endif /* CONFIG_NFS_V4_1 */
785 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
790 *op = &callback_ops[op_nr];
793 return htonl(NFS4ERR_OP_ILLEGAL);
796 return htonl(NFS_OK);
799 static __be32 process_op(uint32_t minorversion, int nop,
800 struct svc_rqst *rqstp,
801 struct xdr_stream *xdr_in, void *argp,
802 struct xdr_stream *xdr_out, void *resp,
803 struct cb_process_state *cps)
805 struct callback_op *op = &callback_ops[0];
811 dprintk("%s: start\n", __func__);
812 status = decode_op_hdr(xdr_in, &op_nr);
813 if (unlikely(status))
816 dprintk("%s: minorversion=%d nop=%d op_nr=%u\n",
817 __func__, minorversion, nop, op_nr);
819 status = minorversion ? preprocess_nfs41_op(nop, op_nr, &op) :
820 preprocess_nfs4_op(op_nr, &op);
821 if (status == htonl(NFS4ERR_OP_ILLEGAL))
822 op_nr = OP_CB_ILLEGAL;
826 if (cps->drc_status) {
827 status = cps->drc_status;
831 maxlen = xdr_out->end - xdr_out->p;
832 if (maxlen > 0 && maxlen < PAGE_SIZE) {
833 status = op->decode_args(rqstp, xdr_in, argp);
834 if (likely(status == 0))
835 status = op->process_op(argp, resp, cps);
837 status = htonl(NFS4ERR_RESOURCE);
840 res = encode_op_hdr(xdr_out, op_nr, status);
843 if (op->encode_res != NULL && status == 0)
844 status = op->encode_res(rqstp, xdr_out, resp);
845 dprintk("%s: done, status = %d\n", __func__, ntohl(status));
850 * Decode, process and encode a COMPOUND
852 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp)
854 struct cb_compound_hdr_arg hdr_arg = { 0 };
855 struct cb_compound_hdr_res hdr_res = { NULL };
856 struct xdr_stream xdr_in, xdr_out;
858 struct cb_process_state cps = {
863 unsigned int nops = 0;
865 dprintk("%s: start\n", __func__);
867 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
869 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
870 xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
872 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
873 if (status == __constant_htonl(NFS4ERR_RESOURCE))
874 return rpc_garbage_args;
876 if (hdr_arg.minorversion == 0) {
877 cps.clp = nfs4_find_client_ident(hdr_arg.cb_ident);
878 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp))
879 return rpc_drop_reply;
882 hdr_res.taglen = hdr_arg.taglen;
883 hdr_res.tag = hdr_arg.tag;
884 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0)
885 return rpc_system_err;
887 while (status == 0 && nops != hdr_arg.nops) {
888 status = process_op(hdr_arg.minorversion, nops, rqstp,
889 &xdr_in, argp, &xdr_out, resp, &cps);
893 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
894 * resource error in cb_compound status without returning op */
895 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
896 status = htonl(NFS4ERR_RESOURCE);
900 *hdr_res.status = status;
901 *hdr_res.nops = htonl(nops);
902 nfs4_cb_free_slot(&cps);
903 nfs_put_client(cps.clp);
904 dprintk("%s: done, status = %u\n", __func__, ntohl(status));
909 * Define NFS4 callback COMPOUND ops.
911 static struct callback_op callback_ops[] = {
913 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
916 .process_op = (callback_process_op_t)nfs4_callback_getattr,
917 .decode_args = (callback_decode_arg_t)decode_getattr_args,
918 .encode_res = (callback_encode_res_t)encode_getattr_res,
919 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
922 .process_op = (callback_process_op_t)nfs4_callback_recall,
923 .decode_args = (callback_decode_arg_t)decode_recall_args,
924 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
926 #if defined(CONFIG_NFS_V4_1)
927 [OP_CB_LAYOUTRECALL] = {
928 .process_op = (callback_process_op_t)nfs4_callback_layoutrecall,
930 (callback_decode_arg_t)decode_layoutrecall_args,
931 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
933 [OP_CB_NOTIFY_DEVICEID] = {
934 .process_op = (callback_process_op_t)nfs4_callback_devicenotify,
936 (callback_decode_arg_t)decode_devicenotify_args,
937 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
940 .process_op = (callback_process_op_t)nfs4_callback_sequence,
941 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args,
942 .encode_res = (callback_encode_res_t)encode_cb_sequence_res,
943 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
945 [OP_CB_RECALL_ANY] = {
946 .process_op = (callback_process_op_t)nfs4_callback_recallany,
947 .decode_args = (callback_decode_arg_t)decode_recallany_args,
948 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
950 [OP_CB_RECALL_SLOT] = {
951 .process_op = (callback_process_op_t)nfs4_callback_recallslot,
952 .decode_args = (callback_decode_arg_t)decode_recallslot_args,
953 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
955 #endif /* CONFIG_NFS_V4_1 */
959 * Define NFS4 callback procedures
961 static struct svc_procedure nfs4_callback_procedures1[] = {
963 .pc_func = nfs4_callback_null,
964 .pc_decode = (kxdrproc_t)nfs4_decode_void,
965 .pc_encode = (kxdrproc_t)nfs4_encode_void,
969 .pc_func = nfs4_callback_compound,
970 .pc_encode = (kxdrproc_t)nfs4_encode_void,
973 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
977 struct svc_version nfs4_callback_version1 = {
979 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
980 .vs_proc = nfs4_callback_procedures1,
981 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
986 struct svc_version nfs4_callback_version4 = {
988 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
989 .vs_proc = nfs4_callback_procedures1,
990 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,