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/slab.h>
13 #include <linux/sunrpc/bc_xprt.h>
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 + \
24 #define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
26 #if defined(CONFIG_NFS_V4_1)
27 #define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
28 #define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
29 #define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
31 #define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
32 #define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
33 #endif /* CONFIG_NFS_V4_1 */
35 #define NFSDBG_FACILITY NFSDBG_CALLBACK
37 /* Internal error code */
38 #define NFS4ERR_RESOURCE_HDR 11050
40 typedef __be32 (*callback_process_op_t)(void *, void *,
41 struct cb_process_state *);
42 typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *);
43 typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *);
47 callback_process_op_t process_op;
48 callback_decode_arg_t decode_args;
49 callback_encode_res_t encode_res;
53 static struct callback_op callback_ops[];
55 static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp)
57 return htonl(NFS4_OK);
60 static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
62 return xdr_argsize_check(rqstp, p);
65 static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
67 return xdr_ressize_check(rqstp, p);
70 static __be32 *read_buf(struct xdr_stream *xdr, int nbytes)
74 p = xdr_inline_decode(xdr, nbytes);
75 if (unlikely(p == NULL))
76 printk(KERN_WARNING "NFSv4 callback reply buffer overflowed!\n");
80 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str)
85 if (unlikely(p == NULL))
86 return htonl(NFS4ERR_RESOURCE);
90 p = read_buf(xdr, *len);
91 if (unlikely(p == NULL))
92 return htonl(NFS4ERR_RESOURCE);
93 *str = (const char *)p;
100 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
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);
118 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
121 unsigned int attrlen;
123 p = read_buf(xdr, 4);
124 if (unlikely(p == NULL))
125 return htonl(NFS4ERR_RESOURCE);
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++);
133 bitmap[1] = ntohl(*p);
137 static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
141 p = read_buf(xdr, 16);
142 if (unlikely(p == NULL))
143 return htonl(NFS4ERR_RESOURCE);
144 memcpy(stateid->data, p, 16);
148 static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
153 status = decode_string(xdr, &hdr->taglen, &hdr->tag);
154 if (unlikely(status != 0))
156 /* We do not like overly long tags! */
157 if (hdr->taglen > CB_OP_TAGLEN_MAXSZ - 12) {
158 printk("NFSv4 CALLBACK %s: client sent tag of length %u\n",
159 __func__, hdr->taglen);
160 return htonl(NFS4ERR_RESOURCE);
162 p = read_buf(xdr, 12);
163 if (unlikely(p == NULL))
164 return htonl(NFS4ERR_RESOURCE);
165 hdr->minorversion = ntohl(*p++);
166 /* Check minor version is zero or one. */
167 if (hdr->minorversion <= 1) {
168 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 */
170 printk(KERN_WARNING "%s: NFSv4 server callback with "
171 "illegal minor version %u!\n",
172 __func__, hdr->minorversion);
173 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
175 hdr->nops = ntohl(*p);
176 dprintk("%s: minorversion %d nops %d\n", __func__,
177 hdr->minorversion, hdr->nops);
181 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
184 p = read_buf(xdr, 4);
185 if (unlikely(p == NULL))
186 return htonl(NFS4ERR_RESOURCE_HDR);
191 static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args)
195 status = decode_fh(xdr, &args->fh);
196 if (unlikely(status != 0))
198 args->addr = svc_addr(rqstp);
199 status = decode_bitmap(xdr, args->bitmap);
201 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
205 static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args)
210 args->addr = svc_addr(rqstp);
211 status = decode_stateid(xdr, &args->stateid);
212 if (unlikely(status != 0))
214 p = read_buf(xdr, 4);
215 if (unlikely(p == NULL)) {
216 status = htonl(NFS4ERR_RESOURCE);
219 args->truncate = ntohl(*p);
220 status = decode_fh(xdr, &args->fh);
222 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
226 #if defined(CONFIG_NFS_V4_1)
228 static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
229 struct xdr_stream *xdr,
230 struct cb_layoutrecallargs *args)
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);
243 args->cbl_layout_type = ntohl(*p++);
244 /* Depite the spec's xdr, iomode really belongs in the FILE switch,
245 * as it is unusable and ignored with the other types.
247 iomode = ntohl(*p++);
248 args->cbl_layoutchanged = ntohl(*p++);
249 args->cbl_recall_type = ntohl(*p++);
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))
257 p = read_buf(xdr, 2 * sizeof(uint64_t));
258 if (unlikely(p == NULL)) {
259 status = htonl(NFS4ERR_BADXDR);
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))
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);
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);
279 dprintk("%s: ltype 0x%x iomode %d changed %d recall_type %d\n",
281 args->cbl_layout_type, iomode,
282 args->cbl_layoutchanged, args->cbl_recall_type);
284 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
289 __be32 decode_devicenotify_args(struct svc_rqst *rqstp,
290 struct xdr_stream *xdr,
291 struct cb_devicenotifyargs *args)
299 /* Num of device notifications */
300 p = read_buf(xdr, sizeof(uint32_t));
301 if (unlikely(p == NULL)) {
302 status = htonl(NFS4ERR_BADXDR);
309 args->devs = kmalloc(n * sizeof(*args->devs), GFP_KERNEL);
311 status = htonl(NFS4ERR_DELAY);
315 /* Decode each dev notification */
316 for (i = 0; i < n; i++) {
317 struct cb_devicenotifyitem *dev = &args->devs[i];
319 p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE);
320 if (unlikely(p == NULL)) {
321 status = htonl(NFS4ERR_BADXDR);
325 tmp = ntohl(*p++); /* bitmap size */
327 status = htonl(NFS4ERR_INVAL);
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);
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);
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);
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);
355 dev->cbd_immediate = ntohl(*p++);
357 dev->cbd_immediate = 0;
362 dprintk("%s: type %d layout 0x%x immediate %d\n",
363 __func__, dev->cbd_notify_type, dev->cbd_layout_type,
367 dprintk("%s: status %d ndevs %d\n",
368 __func__, ntohl(status), args->ndevs);
375 static __be32 decode_sessionid(struct xdr_stream *xdr,
376 struct nfs4_sessionid *sid)
379 int len = NFS4_MAX_SESSIONID_LEN;
381 p = read_buf(xdr, len);
382 if (unlikely(p == NULL))
383 return htonl(NFS4ERR_RESOURCE);
385 memcpy(sid->data, p, len);
389 static __be32 decode_rc_list(struct xdr_stream *xdr,
390 struct referring_call_list *rc_list)
396 status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
400 status = htonl(NFS4ERR_RESOURCE);
401 p = read_buf(xdr, sizeof(uint32_t));
402 if (unlikely(p == NULL))
405 rc_list->rcl_nrefcalls = ntohl(*p++);
406 if (rc_list->rcl_nrefcalls) {
408 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
409 if (unlikely(p == NULL))
411 rc_list->rcl_refcalls = kmalloc(rc_list->rcl_nrefcalls *
412 sizeof(*rc_list->rcl_refcalls),
414 if (unlikely(rc_list->rcl_refcalls == NULL))
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++);
427 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
428 struct xdr_stream *xdr,
429 struct cb_sequenceargs *args)
435 status = decode_sessionid(xdr, &args->csa_sessionid);
439 status = htonl(NFS4ERR_RESOURCE);
440 p = read_buf(xdr, 5 * sizeof(uint32_t));
441 if (unlikely(p == NULL))
444 args->csa_addr = svc_addr(rqstp);
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),
455 if (unlikely(args->csa_rclists == NULL))
458 for (i = 0; i < args->csa_nrclists; i++) {
459 status = decode_rc_list(xdr, &args->csa_rclists[i]);
466 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u "
467 "highestslotid %u cachethis %d nrclists %u\n",
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,
477 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
481 for (i = 0; i < args->csa_nrclists; i++)
482 kfree(args->csa_rclists[i].rcl_refcalls);
483 kfree(args->csa_rclists);
487 static __be32 decode_recallany_args(struct svc_rqst *rqstp,
488 struct xdr_stream *xdr,
489 struct cb_recallanyargs *args)
493 args->craa_addr = svc_addr(rqstp);
494 p = read_buf(xdr, 4);
495 if (unlikely(p == NULL))
496 return htonl(NFS4ERR_BADXDR);
497 args->craa_objs_to_keep = ntohl(*p++);
498 p = read_buf(xdr, 4);
499 if (unlikely(p == NULL))
500 return htonl(NFS4ERR_BADXDR);
501 args->craa_type_mask = ntohl(*p);
506 static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
507 struct xdr_stream *xdr,
508 struct cb_recallslotargs *args)
512 args->crsa_addr = svc_addr(rqstp);
513 p = read_buf(xdr, 4);
514 if (unlikely(p == NULL))
515 return htonl(NFS4ERR_BADXDR);
516 args->crsa_target_max_slots = ntohl(*p++);
520 #endif /* CONFIG_NFS_V4_1 */
522 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
526 p = xdr_reserve_space(xdr, 4 + len);
527 if (unlikely(p == NULL))
528 return htonl(NFS4ERR_RESOURCE);
529 xdr_encode_opaque(p, str, len);
533 #define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE)
534 #define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY)
535 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep)
540 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0);
541 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1);
543 p = xdr_reserve_space(xdr, 16);
544 if (unlikely(p == NULL))
545 return htonl(NFS4ERR_RESOURCE);
549 } else if (bm[0] != 0) {
550 p = xdr_reserve_space(xdr, 12);
551 if (unlikely(p == NULL))
552 return htonl(NFS4ERR_RESOURCE);
556 p = xdr_reserve_space(xdr, 8);
557 if (unlikely(p == NULL))
558 return htonl(NFS4ERR_RESOURCE);
565 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
569 if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
571 p = xdr_reserve_space(xdr, 8);
573 return htonl(NFS4ERR_RESOURCE);
574 p = xdr_encode_hyper(p, change);
578 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
582 if (!(bitmap[0] & FATTR4_WORD0_SIZE))
584 p = xdr_reserve_space(xdr, 8);
586 return htonl(NFS4ERR_RESOURCE);
587 p = xdr_encode_hyper(p, size);
591 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
595 p = xdr_reserve_space(xdr, 12);
597 return htonl(NFS4ERR_RESOURCE);
598 p = xdr_encode_hyper(p, time->tv_sec);
599 *p = htonl(time->tv_nsec);
603 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
605 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
607 return encode_attr_time(xdr,time);
610 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
612 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
614 return encode_attr_time(xdr,time);
617 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
621 hdr->status = xdr_reserve_space(xdr, 4);
622 if (unlikely(hdr->status == NULL))
623 return htonl(NFS4ERR_RESOURCE);
624 status = encode_string(xdr, hdr->taglen, hdr->tag);
625 if (unlikely(status != 0))
627 hdr->nops = xdr_reserve_space(xdr, 4);
628 if (unlikely(hdr->nops == NULL))
629 return htonl(NFS4ERR_RESOURCE);
633 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
637 p = xdr_reserve_space(xdr, 8);
638 if (unlikely(p == NULL))
639 return htonl(NFS4ERR_RESOURCE_HDR);
645 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res)
647 __be32 *savep = NULL;
648 __be32 status = res->status;
650 if (unlikely(status != 0))
652 status = encode_attr_bitmap(xdr, res->bitmap, &savep);
653 if (unlikely(status != 0))
655 status = encode_attr_change(xdr, res->bitmap, res->change_attr);
656 if (unlikely(status != 0))
658 status = encode_attr_size(xdr, res->bitmap, res->size);
659 if (unlikely(status != 0))
661 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
662 if (unlikely(status != 0))
664 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
665 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
667 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
671 #if defined(CONFIG_NFS_V4_1)
673 static __be32 encode_sessionid(struct xdr_stream *xdr,
674 const struct nfs4_sessionid *sid)
677 int len = NFS4_MAX_SESSIONID_LEN;
679 p = xdr_reserve_space(xdr, len);
680 if (unlikely(p == NULL))
681 return htonl(NFS4ERR_RESOURCE);
687 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
688 struct xdr_stream *xdr,
689 const struct cb_sequenceres *res)
692 unsigned status = res->csr_status;
694 if (unlikely(status != 0))
697 encode_sessionid(xdr, &res->csr_sessionid);
699 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
700 if (unlikely(p == NULL))
701 return htonl(NFS4ERR_RESOURCE);
703 *p++ = htonl(res->csr_sequenceid);
704 *p++ = htonl(res->csr_slotid);
705 *p++ = htonl(res->csr_highestslotid);
706 *p++ = htonl(res->csr_target_highestslotid);
708 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
713 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
715 if (op_nr == OP_CB_SEQUENCE) {
717 return htonl(NFS4ERR_SEQUENCE_POS);
720 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
727 case OP_CB_RECALL_ANY:
728 case OP_CB_RECALL_SLOT:
729 case OP_CB_LAYOUTRECALL:
730 case OP_CB_NOTIFY_DEVICEID:
731 *op = &callback_ops[op_nr];
735 case OP_CB_PUSH_DELEG:
736 case OP_CB_RECALLABLE_OBJ_AVAIL:
737 case OP_CB_WANTS_CANCELLED:
738 case OP_CB_NOTIFY_LOCK:
739 return htonl(NFS4ERR_NOTSUPP);
742 return htonl(NFS4ERR_OP_ILLEGAL);
745 return htonl(NFS_OK);
748 static void nfs4_callback_free_slot(struct nfs4_session *session)
750 struct nfs4_slot_table *tbl = &session->bc_slot_table;
752 spin_lock(&tbl->slot_tbl_lock);
754 * Let the state manager know callback processing done.
755 * A single slot, so highest used slotid is either 0 or -1
757 tbl->highest_used_slotid = -1;
758 nfs4_check_drain_bc_complete(session);
759 spin_unlock(&tbl->slot_tbl_lock);
762 static void nfs4_cb_free_slot(struct cb_process_state *cps)
764 if (cps->slotid != -1)
765 nfs4_callback_free_slot(cps->clp->cl_session);
768 #else /* CONFIG_NFS_V4_1 */
771 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
773 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
776 static void nfs4_cb_free_slot(struct cb_process_state *cps)
779 #endif /* CONFIG_NFS_V4_1 */
782 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
787 *op = &callback_ops[op_nr];
790 return htonl(NFS4ERR_OP_ILLEGAL);
793 return htonl(NFS_OK);
796 static __be32 process_op(uint32_t minorversion, int nop,
797 struct svc_rqst *rqstp,
798 struct xdr_stream *xdr_in, void *argp,
799 struct xdr_stream *xdr_out, void *resp,
800 struct cb_process_state *cps)
802 struct callback_op *op = &callback_ops[0];
808 dprintk("%s: start\n", __func__);
809 status = decode_op_hdr(xdr_in, &op_nr);
810 if (unlikely(status))
813 dprintk("%s: minorversion=%d nop=%d op_nr=%u\n",
814 __func__, minorversion, nop, op_nr);
816 status = minorversion ? preprocess_nfs41_op(nop, op_nr, &op) :
817 preprocess_nfs4_op(op_nr, &op);
818 if (status == htonl(NFS4ERR_OP_ILLEGAL))
819 op_nr = OP_CB_ILLEGAL;
823 if (cps->drc_status) {
824 status = cps->drc_status;
828 maxlen = xdr_out->end - xdr_out->p;
829 if (maxlen > 0 && maxlen < PAGE_SIZE) {
830 status = op->decode_args(rqstp, xdr_in, argp);
831 if (likely(status == 0))
832 status = op->process_op(argp, resp, cps);
834 status = htonl(NFS4ERR_RESOURCE);
837 res = encode_op_hdr(xdr_out, op_nr, status);
840 if (op->encode_res != NULL && status == 0)
841 status = op->encode_res(rqstp, xdr_out, resp);
842 dprintk("%s: done, status = %d\n", __func__, ntohl(status));
847 * Decode, process and encode a COMPOUND
849 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp)
851 struct cb_compound_hdr_arg hdr_arg = { 0 };
852 struct cb_compound_hdr_res hdr_res = { NULL };
853 struct xdr_stream xdr_in, xdr_out;
855 struct cb_process_state cps = {
860 unsigned int nops = 0;
862 dprintk("%s: start\n", __func__);
864 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
866 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
867 xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
869 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
870 if (status == __constant_htonl(NFS4ERR_RESOURCE))
871 return rpc_garbage_args;
873 if (hdr_arg.minorversion == 0) {
874 cps.clp = nfs4_find_client_ident(hdr_arg.cb_ident);
875 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp))
876 return rpc_drop_reply;
879 hdr_res.taglen = hdr_arg.taglen;
880 hdr_res.tag = hdr_arg.tag;
881 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0)
882 return rpc_system_err;
884 while (status == 0 && nops != hdr_arg.nops) {
885 status = process_op(hdr_arg.minorversion, nops, rqstp,
886 &xdr_in, argp, &xdr_out, resp, &cps);
890 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
891 * resource error in cb_compound status without returning op */
892 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
893 status = htonl(NFS4ERR_RESOURCE);
897 *hdr_res.status = status;
898 *hdr_res.nops = htonl(nops);
899 nfs4_cb_free_slot(&cps);
900 nfs_put_client(cps.clp);
901 dprintk("%s: done, status = %u\n", __func__, ntohl(status));
906 * Define NFS4 callback COMPOUND ops.
908 static struct callback_op callback_ops[] = {
910 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
913 .process_op = (callback_process_op_t)nfs4_callback_getattr,
914 .decode_args = (callback_decode_arg_t)decode_getattr_args,
915 .encode_res = (callback_encode_res_t)encode_getattr_res,
916 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
919 .process_op = (callback_process_op_t)nfs4_callback_recall,
920 .decode_args = (callback_decode_arg_t)decode_recall_args,
921 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
923 #if defined(CONFIG_NFS_V4_1)
924 [OP_CB_LAYOUTRECALL] = {
925 .process_op = (callback_process_op_t)nfs4_callback_layoutrecall,
927 (callback_decode_arg_t)decode_layoutrecall_args,
928 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
930 [OP_CB_NOTIFY_DEVICEID] = {
931 .process_op = (callback_process_op_t)nfs4_callback_devicenotify,
933 (callback_decode_arg_t)decode_devicenotify_args,
934 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
937 .process_op = (callback_process_op_t)nfs4_callback_sequence,
938 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args,
939 .encode_res = (callback_encode_res_t)encode_cb_sequence_res,
940 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
942 [OP_CB_RECALL_ANY] = {
943 .process_op = (callback_process_op_t)nfs4_callback_recallany,
944 .decode_args = (callback_decode_arg_t)decode_recallany_args,
945 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
947 [OP_CB_RECALL_SLOT] = {
948 .process_op = (callback_process_op_t)nfs4_callback_recallslot,
949 .decode_args = (callback_decode_arg_t)decode_recallslot_args,
950 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
952 #endif /* CONFIG_NFS_V4_1 */
956 * Define NFS4 callback procedures
958 static struct svc_procedure nfs4_callback_procedures1[] = {
960 .pc_func = nfs4_callback_null,
961 .pc_decode = (kxdrproc_t)nfs4_decode_void,
962 .pc_encode = (kxdrproc_t)nfs4_encode_void,
966 .pc_func = nfs4_callback_compound,
967 .pc_encode = (kxdrproc_t)nfs4_encode_void,
970 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
974 struct svc_version nfs4_callback_version1 = {
976 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
977 .vs_proc = nfs4_callback_procedures1,
978 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
983 struct svc_version nfs4_callback_version4 = {
985 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
986 .vs_proc = nfs4_callback_procedures1,
987 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,