blob: dd0ef34b58450409b0ca959dca6f8e90c00568d7 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/nfs/callback_xdr.c
3 *
4 * Copyright (C) 2004 Trond Myklebust
5 *
6 * NFSv4 callback encode/decode procedures
7 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07008#include <linux/kernel.h>
9#include <linux/sunrpc/svc.h>
10#include <linux/nfs4.h>
11#include <linux/nfs_fs.h>
Trond Myklebust4ce79712005-06-22 17:16:21 +000012#include "nfs4_fs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include "callback.h"
14
15#define CB_OP_TAGLEN_MAXSZ (512)
16#define CB_OP_HDR_RES_MAXSZ (2 + CB_OP_TAGLEN_MAXSZ)
17#define CB_OP_GETATTR_BITMAP_MAXSZ (4)
18#define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
19 CB_OP_GETATTR_BITMAP_MAXSZ + \
20 2 + 2 + 3 + 3)
21#define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
22
23#define NFSDBG_FACILITY NFSDBG_CALLBACK
24
Al Viroe6f684f2006-10-19 23:28:50 -070025typedef __be32 (*callback_process_op_t)(void *, void *);
26typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *);
27typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
29
30struct callback_op {
31 callback_process_op_t process_op;
32 callback_decode_arg_t decode_args;
33 callback_encode_res_t encode_res;
34 long res_maxsize;
35};
36
37static struct callback_op callback_ops[];
38
Al Viro7111c662006-10-19 23:28:45 -070039static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp)
Linus Torvalds1da177e2005-04-16 15:20:36 -070040{
41 return htonl(NFS4_OK);
42}
43
Al Viro5704fde2006-10-19 23:28:51 -070044static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
Linus Torvalds1da177e2005-04-16 15:20:36 -070045{
46 return xdr_argsize_check(rqstp, p);
47}
48
Al Viro5704fde2006-10-19 23:28:51 -070049static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
Linus Torvalds1da177e2005-04-16 15:20:36 -070050{
51 return xdr_ressize_check(rqstp, p);
52}
53
Al Viro5704fde2006-10-19 23:28:51 -070054static __be32 *read_buf(struct xdr_stream *xdr, int nbytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -070055{
Al Viro5704fde2006-10-19 23:28:51 -070056 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
58 p = xdr_inline_decode(xdr, nbytes);
59 if (unlikely(p == NULL))
60 printk(KERN_WARNING "NFSv4 callback reply buffer overflowed!\n");
61 return p;
62}
63
Al Viroe6f684f2006-10-19 23:28:50 -070064static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str)
Linus Torvalds1da177e2005-04-16 15:20:36 -070065{
Al Viro5704fde2006-10-19 23:28:51 -070066 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -070067
68 p = read_buf(xdr, 4);
69 if (unlikely(p == NULL))
70 return htonl(NFS4ERR_RESOURCE);
71 *len = ntohl(*p);
72
73 if (*len != 0) {
74 p = read_buf(xdr, *len);
75 if (unlikely(p == NULL))
76 return htonl(NFS4ERR_RESOURCE);
77 *str = (const char *)p;
78 } else
79 *str = NULL;
80
81 return 0;
82}
83
Al Viroe6f684f2006-10-19 23:28:50 -070084static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
Linus Torvalds1da177e2005-04-16 15:20:36 -070085{
Al Viro5704fde2006-10-19 23:28:51 -070086 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
88 p = read_buf(xdr, 4);
89 if (unlikely(p == NULL))
90 return htonl(NFS4ERR_RESOURCE);
91 fh->size = ntohl(*p);
92 if (fh->size > NFS4_FHSIZE)
93 return htonl(NFS4ERR_BADHANDLE);
94 p = read_buf(xdr, fh->size);
95 if (unlikely(p == NULL))
96 return htonl(NFS4ERR_RESOURCE);
97 memcpy(&fh->data[0], p, fh->size);
98 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
99 return 0;
100}
101
Al Viroe6f684f2006-10-19 23:28:50 -0700102static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103{
Al Viro5704fde2006-10-19 23:28:51 -0700104 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 unsigned int attrlen;
106
107 p = read_buf(xdr, 4);
108 if (unlikely(p == NULL))
109 return htonl(NFS4ERR_RESOURCE);
110 attrlen = ntohl(*p);
111 p = read_buf(xdr, attrlen << 2);
112 if (unlikely(p == NULL))
113 return htonl(NFS4ERR_RESOURCE);
114 if (likely(attrlen > 0))
115 bitmap[0] = ntohl(*p++);
116 if (attrlen > 1)
117 bitmap[1] = ntohl(*p);
118 return 0;
119}
120
Al Viroe6f684f2006-10-19 23:28:50 -0700121static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122{
Al Viro5704fde2006-10-19 23:28:51 -0700123 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124
125 p = read_buf(xdr, 16);
126 if (unlikely(p == NULL))
127 return htonl(NFS4ERR_RESOURCE);
128 memcpy(stateid->data, p, 16);
129 return 0;
130}
131
Al Viroe6f684f2006-10-19 23:28:50 -0700132static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133{
Al Viro5704fde2006-10-19 23:28:51 -0700134 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 unsigned int minor_version;
Al Viroe6f684f2006-10-19 23:28:50 -0700136 __be32 status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
138 status = decode_string(xdr, &hdr->taglen, &hdr->tag);
139 if (unlikely(status != 0))
140 return status;
141 /* We do not like overly long tags! */
Chuck Lever5cce4282007-10-26 13:33:01 -0400142 if (hdr->taglen > CB_OP_TAGLEN_MAXSZ - 12) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 printk("NFSv4 CALLBACK %s: client sent tag of length %u\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -0700144 __func__, hdr->taglen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 return htonl(NFS4ERR_RESOURCE);
146 }
147 p = read_buf(xdr, 12);
148 if (unlikely(p == NULL))
149 return htonl(NFS4ERR_RESOURCE);
150 minor_version = ntohl(*p++);
151 /* Check minor version is zero. */
152 if (minor_version != 0) {
153 printk(KERN_WARNING "%s: NFSv4 server callback with illegal minor version %u!\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -0700154 __func__, minor_version);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
156 }
157 hdr->callback_ident = ntohl(*p++);
158 hdr->nops = ntohl(*p);
159 return 0;
160}
161
Al Viroe6f684f2006-10-19 23:28:50 -0700162static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163{
Al Viro5704fde2006-10-19 23:28:51 -0700164 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 p = read_buf(xdr, 4);
166 if (unlikely(p == NULL))
167 return htonl(NFS4ERR_RESOURCE);
168 *op = ntohl(*p);
169 return 0;
170}
171
Al Viroe6f684f2006-10-19 23:28:50 -0700172static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173{
Al Viroe6f684f2006-10-19 23:28:50 -0700174 __be32 status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
176 status = decode_fh(xdr, &args->fh);
177 if (unlikely(status != 0))
178 goto out;
Chuck Lever671beed2007-12-10 14:58:22 -0500179 args->addr = svc_addr(rqstp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 status = decode_bitmap(xdr, args->bitmap);
181out:
Harvey Harrison3110ff82008-05-02 13:42:44 -0700182 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 return status;
184}
185
Al Viroe6f684f2006-10-19 23:28:50 -0700186static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187{
Al Viro5704fde2006-10-19 23:28:51 -0700188 __be32 *p;
Al Viroe6f684f2006-10-19 23:28:50 -0700189 __be32 status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190
Chuck Leverc1d35862007-12-10 14:58:29 -0500191 args->addr = svc_addr(rqstp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 status = decode_stateid(xdr, &args->stateid);
193 if (unlikely(status != 0))
194 goto out;
195 p = read_buf(xdr, 4);
196 if (unlikely(p == NULL)) {
197 status = htonl(NFS4ERR_RESOURCE);
198 goto out;
199 }
200 args->truncate = ntohl(*p);
201 status = decode_fh(xdr, &args->fh);
202out:
Harvey Harrison3110ff82008-05-02 13:42:44 -0700203 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
Alexey Dobriyan3873bc52006-05-27 03:31:12 +0400204 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205}
206
Al Viroe6f684f2006-10-19 23:28:50 -0700207static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208{
Al Viro5704fde2006-10-19 23:28:51 -0700209 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210
211 p = xdr_reserve_space(xdr, 4 + len);
212 if (unlikely(p == NULL))
213 return htonl(NFS4ERR_RESOURCE);
214 xdr_encode_opaque(p, str, len);
215 return 0;
216}
217
218#define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE)
219#define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY)
Al Viro5704fde2006-10-19 23:28:51 -0700220static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221{
Al Viro5704fde2006-10-19 23:28:51 -0700222 __be32 bm[2];
223 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
225 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0);
226 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1);
227 if (bm[1] != 0) {
228 p = xdr_reserve_space(xdr, 16);
229 if (unlikely(p == NULL))
230 return htonl(NFS4ERR_RESOURCE);
231 *p++ = htonl(2);
232 *p++ = bm[0];
233 *p++ = bm[1];
234 } else if (bm[0] != 0) {
235 p = xdr_reserve_space(xdr, 12);
236 if (unlikely(p == NULL))
237 return htonl(NFS4ERR_RESOURCE);
238 *p++ = htonl(1);
239 *p++ = bm[0];
240 } else {
241 p = xdr_reserve_space(xdr, 8);
242 if (unlikely(p == NULL))
243 return htonl(NFS4ERR_RESOURCE);
244 *p++ = htonl(0);
245 }
246 *savep = p;
247 return 0;
248}
249
Al Viroe6f684f2006-10-19 23:28:50 -0700250static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251{
Al Viro5704fde2006-10-19 23:28:51 -0700252 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
254 if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
255 return 0;
256 p = xdr_reserve_space(xdr, 8);
Harvey Harrison90dc7d22008-02-20 13:03:05 -0800257 if (unlikely(!p))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 return htonl(NFS4ERR_RESOURCE);
259 p = xdr_encode_hyper(p, change);
260 return 0;
261}
262
Al Viroe6f684f2006-10-19 23:28:50 -0700263static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264{
Al Viro5704fde2006-10-19 23:28:51 -0700265 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
267 if (!(bitmap[0] & FATTR4_WORD0_SIZE))
268 return 0;
269 p = xdr_reserve_space(xdr, 8);
Harvey Harrison90dc7d22008-02-20 13:03:05 -0800270 if (unlikely(!p))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 return htonl(NFS4ERR_RESOURCE);
272 p = xdr_encode_hyper(p, size);
273 return 0;
274}
275
Al Viroe6f684f2006-10-19 23:28:50 -0700276static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277{
Al Viro5704fde2006-10-19 23:28:51 -0700278 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279
280 p = xdr_reserve_space(xdr, 12);
Harvey Harrison90dc7d22008-02-20 13:03:05 -0800281 if (unlikely(!p))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 return htonl(NFS4ERR_RESOURCE);
283 p = xdr_encode_hyper(p, time->tv_sec);
284 *p = htonl(time->tv_nsec);
285 return 0;
286}
287
Al Viroe6f684f2006-10-19 23:28:50 -0700288static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289{
290 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
291 return 0;
292 return encode_attr_time(xdr,time);
293}
294
Al Viroe6f684f2006-10-19 23:28:50 -0700295static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296{
297 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
298 return 0;
299 return encode_attr_time(xdr,time);
300}
301
Al Viroe6f684f2006-10-19 23:28:50 -0700302static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303{
Al Viroe6f684f2006-10-19 23:28:50 -0700304 __be32 status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305
306 hdr->status = xdr_reserve_space(xdr, 4);
307 if (unlikely(hdr->status == NULL))
308 return htonl(NFS4ERR_RESOURCE);
309 status = encode_string(xdr, hdr->taglen, hdr->tag);
310 if (unlikely(status != 0))
311 return status;
312 hdr->nops = xdr_reserve_space(xdr, 4);
313 if (unlikely(hdr->nops == NULL))
314 return htonl(NFS4ERR_RESOURCE);
315 return 0;
316}
317
Al Viroe6f684f2006-10-19 23:28:50 -0700318static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319{
Al Viro5704fde2006-10-19 23:28:51 -0700320 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321
322 p = xdr_reserve_space(xdr, 8);
323 if (unlikely(p == NULL))
324 return htonl(NFS4ERR_RESOURCE);
325 *p++ = htonl(op);
326 *p = res;
327 return 0;
328}
329
Al Viroe6f684f2006-10-19 23:28:50 -0700330static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331{
Al Viro5704fde2006-10-19 23:28:51 -0700332 __be32 *savep = NULL;
Al Viroe6f684f2006-10-19 23:28:50 -0700333 __be32 status = res->status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334
335 if (unlikely(status != 0))
336 goto out;
337 status = encode_attr_bitmap(xdr, res->bitmap, &savep);
338 if (unlikely(status != 0))
339 goto out;
340 status = encode_attr_change(xdr, res->bitmap, res->change_attr);
341 if (unlikely(status != 0))
342 goto out;
343 status = encode_attr_size(xdr, res->bitmap, res->size);
344 if (unlikely(status != 0))
345 goto out;
346 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
347 if (unlikely(status != 0))
348 goto out;
349 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
350 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
351out:
Harvey Harrison3110ff82008-05-02 13:42:44 -0700352 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 return status;
354}
355
Al Viroe6f684f2006-10-19 23:28:50 -0700356static __be32 process_op(struct svc_rqst *rqstp,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 struct xdr_stream *xdr_in, void *argp,
358 struct xdr_stream *xdr_out, void *resp)
359{
Trond Myklebusta162a6b2006-03-20 13:44:10 -0500360 struct callback_op *op = &callback_ops[0];
361 unsigned int op_nr = OP_CB_ILLEGAL;
Al Viroe6f684f2006-10-19 23:28:50 -0700362 __be32 status = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 long maxlen;
Al Viroe6f684f2006-10-19 23:28:50 -0700364 __be32 res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
Harvey Harrison3110ff82008-05-02 13:42:44 -0700366 dprintk("%s: start\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 status = decode_op_hdr(xdr_in, &op_nr);
Trond Myklebusta162a6b2006-03-20 13:44:10 -0500368 if (likely(status == 0)) {
369 switch (op_nr) {
370 case OP_CB_GETATTR:
371 case OP_CB_RECALL:
372 op = &callback_ops[op_nr];
373 break;
374 default:
375 op_nr = OP_CB_ILLEGAL;
376 op = &callback_ops[0];
377 status = htonl(NFS4ERR_OP_ILLEGAL);
378 }
379 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380
381 maxlen = xdr_out->end - xdr_out->p;
382 if (maxlen > 0 && maxlen < PAGE_SIZE) {
383 if (likely(status == 0 && op->decode_args != NULL))
384 status = op->decode_args(rqstp, xdr_in, argp);
385 if (likely(status == 0 && op->process_op != NULL))
386 status = op->process_op(argp, resp);
387 } else
388 status = htonl(NFS4ERR_RESOURCE);
389
390 res = encode_op_hdr(xdr_out, op_nr, status);
391 if (status == 0)
392 status = res;
393 if (op->encode_res != NULL && status == 0)
394 status = op->encode_res(rqstp, xdr_out, resp);
Harvey Harrison3110ff82008-05-02 13:42:44 -0700395 dprintk("%s: done, status = %d\n", __func__, ntohl(status));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 return status;
397}
398
399/*
400 * Decode, process and encode a COMPOUND
401 */
Al Viro7111c662006-10-19 23:28:45 -0700402static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403{
Trond Myklebust3a6258e2008-05-06 13:32:40 -0400404 struct cb_compound_hdr_arg hdr_arg = { 0 };
405 struct cb_compound_hdr_res hdr_res = { NULL };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 struct xdr_stream xdr_in, xdr_out;
Al Viro5704fde2006-10-19 23:28:51 -0700407 __be32 *p;
Al Viroe6f684f2006-10-19 23:28:50 -0700408 __be32 status;
Trond Myklebust3a6258e2008-05-06 13:32:40 -0400409 unsigned int nops = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410
Harvey Harrison3110ff82008-05-02 13:42:44 -0700411 dprintk("%s: start\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412
413 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
414
Al Viro5704fde2006-10-19 23:28:51 -0700415 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
417
Trond Myklebust3a6258e2008-05-06 13:32:40 -0400418 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
419 if (status == __constant_htonl(NFS4ERR_RESOURCE))
420 return rpc_garbage_args;
421
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 hdr_res.taglen = hdr_arg.taglen;
423 hdr_res.tag = hdr_arg.tag;
Trond Myklebust3a6258e2008-05-06 13:32:40 -0400424 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0)
425 return rpc_system_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426
Trond Myklebust3a6258e2008-05-06 13:32:40 -0400427 while (status == 0 && nops != hdr_arg.nops) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 status = process_op(rqstp, &xdr_in, argp, &xdr_out, resp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 nops++;
430 }
Trond Myklebust3a6258e2008-05-06 13:32:40 -0400431
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 *hdr_res.status = status;
433 *hdr_res.nops = htonl(nops);
Harvey Harrison3110ff82008-05-02 13:42:44 -0700434 dprintk("%s: done, status = %u\n", __func__, ntohl(status));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 return rpc_success;
436}
437
438/*
439 * Define NFS4 callback COMPOUND ops.
440 */
441static struct callback_op callback_ops[] = {
442 [0] = {
443 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
444 },
445 [OP_CB_GETATTR] = {
446 .process_op = (callback_process_op_t)nfs4_callback_getattr,
447 .decode_args = (callback_decode_arg_t)decode_getattr_args,
448 .encode_res = (callback_encode_res_t)encode_getattr_res,
449 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
450 },
451 [OP_CB_RECALL] = {
452 .process_op = (callback_process_op_t)nfs4_callback_recall,
453 .decode_args = (callback_decode_arg_t)decode_recall_args,
454 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
455 }
456};
457
458/*
459 * Define NFS4 callback procedures
460 */
461static struct svc_procedure nfs4_callback_procedures1[] = {
462 [CB_NULL] = {
463 .pc_func = nfs4_callback_null,
464 .pc_decode = (kxdrproc_t)nfs4_decode_void,
465 .pc_encode = (kxdrproc_t)nfs4_encode_void,
466 .pc_xdrressize = 1,
467 },
468 [CB_COMPOUND] = {
469 .pc_func = nfs4_callback_compound,
470 .pc_encode = (kxdrproc_t)nfs4_encode_void,
471 .pc_argsize = 256,
472 .pc_ressize = 256,
473 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
474 }
475};
476
477struct svc_version nfs4_callback_version1 = {
478 .vs_vers = 1,
479 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
480 .vs_proc = nfs4_callback_procedures1,
481 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
482 .vs_dispatch = NULL,
483};
484