blob: 14d9ecb96cff0ba476549467fbc321f94ea55ff3 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * XDR support for nfsd/protocol version 3.
3 *
4 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
5 *
6 * 2003-08-09 Jamie Lokier: Use htonl() for nanoseconds, not htons()!
7 */
8
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#include <linux/namei.h>
Stanislav Kinsburskyb9c0ef82012-12-06 14:23:19 +030010#include <linux/sunrpc/svc_xprt.h>
Boaz Harrosh9a74af22009-12-03 20:30:56 +020011#include "xdr3.h"
J. Bruce Fields2e8138a2007-11-15 17:05:43 -050012#include "auth.h"
Stanislav Kinsburskyb9c0ef82012-12-06 14:23:19 +030013#include "netns.h"
Al Viro3dadecc2013-01-24 02:18:08 -050014#include "vfs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070015
16#define NFSDDBG_FACILITY NFSDDBG_XDR
17
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
19/*
20 * Mapping of S_IF* types to NFS file types
21 */
22static u32 nfs3_ftypes[] = {
23 NF3NON, NF3FIFO, NF3CHR, NF3BAD,
24 NF3DIR, NF3BAD, NF3BLK, NF3BAD,
25 NF3REG, NF3BAD, NF3LNK, NF3BAD,
26 NF3SOCK, NF3BAD, NF3LNK, NF3BAD,
27};
28
29/*
30 * XDR functions for basic NFS types
31 */
Adrian Bunk3ee6f612006-12-06 20:40:23 -080032static __be32 *
Al Viro91f07162006-10-19 23:28:57 -070033encode_time3(__be32 *p, struct timespec *time)
Linus Torvalds1da177e2005-04-16 15:20:36 -070034{
35 *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
36 return p;
37}
38
Adrian Bunk3ee6f612006-12-06 20:40:23 -080039static __be32 *
Al Viro91f07162006-10-19 23:28:57 -070040decode_time3(__be32 *p, struct timespec *time)
Linus Torvalds1da177e2005-04-16 15:20:36 -070041{
42 time->tv_sec = ntohl(*p++);
43 time->tv_nsec = ntohl(*p++);
44 return p;
45}
46
Adrian Bunk3ee6f612006-12-06 20:40:23 -080047static __be32 *
Al Viro91f07162006-10-19 23:28:57 -070048decode_fh(__be32 *p, struct svc_fh *fhp)
Linus Torvalds1da177e2005-04-16 15:20:36 -070049{
50 unsigned int size;
51 fh_init(fhp, NFS3_FHSIZE);
52 size = ntohl(*p++);
53 if (size > NFS3_FHSIZE)
54 return NULL;
55
56 memcpy(&fhp->fh_handle.fh_base, p, size);
57 fhp->fh_handle.fh_size = size;
58 return p + XDR_QUADLEN(size);
59}
60
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +000061/* Helper function for NFSv3 ACL code */
Al Viro91f07162006-10-19 23:28:57 -070062__be32 *nfs3svc_decode_fh(__be32 *p, struct svc_fh *fhp)
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +000063{
64 return decode_fh(p, fhp);
65}
66
Adrian Bunk3ee6f612006-12-06 20:40:23 -080067static __be32 *
Al Viro91f07162006-10-19 23:28:57 -070068encode_fh(__be32 *p, struct svc_fh *fhp)
Linus Torvalds1da177e2005-04-16 15:20:36 -070069{
70 unsigned int size = fhp->fh_handle.fh_size;
71 *p++ = htonl(size);
72 if (size) p[XDR_QUADLEN(size)-1]=0;
73 memcpy(p, &fhp->fh_handle.fh_base, size);
74 return p + XDR_QUADLEN(size);
75}
76
77/*
78 * Decode a file name and make sure that the path contains
79 * no slashes or null bytes.
80 */
Adrian Bunk3ee6f612006-12-06 20:40:23 -080081static __be32 *
Chuck Leveree1a95b2007-11-01 16:56:58 -040082decode_filename(__be32 *p, char **namp, unsigned int *lenp)
Linus Torvalds1da177e2005-04-16 15:20:36 -070083{
84 char *name;
Chuck Leveree1a95b2007-11-01 16:56:58 -040085 unsigned int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
87 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) {
88 for (i = 0, name = *namp; i < *lenp; i++, name++) {
89 if (*name == '\0' || *name == '/')
90 return NULL;
91 }
92 }
93
94 return p;
95}
96
Adrian Bunk3ee6f612006-12-06 20:40:23 -080097static __be32 *
Al Viro91f07162006-10-19 23:28:57 -070098decode_sattr3(__be32 *p, struct iattr *iap)
Linus Torvalds1da177e2005-04-16 15:20:36 -070099{
100 u32 tmp;
101
102 iap->ia_valid = 0;
103
104 if (*p++) {
105 iap->ia_valid |= ATTR_MODE;
106 iap->ia_mode = ntohl(*p++);
107 }
108 if (*p++) {
Eric W. Biederman458878a2013-02-02 04:16:08 -0800109 iap->ia_uid = make_kuid(&init_user_ns, ntohl(*p++));
110 if (uid_valid(iap->ia_uid))
111 iap->ia_valid |= ATTR_UID;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 }
113 if (*p++) {
Eric W. Biederman458878a2013-02-02 04:16:08 -0800114 iap->ia_gid = make_kgid(&init_user_ns, ntohl(*p++));
115 if (gid_valid(iap->ia_gid))
116 iap->ia_valid |= ATTR_GID;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 }
118 if (*p++) {
119 u64 newsize;
120
121 iap->ia_valid |= ATTR_SIZE;
122 p = xdr_decode_hyper(p, &newsize);
123 if (newsize <= NFS_OFFSET_MAX)
124 iap->ia_size = newsize;
125 else
126 iap->ia_size = NFS_OFFSET_MAX;
127 }
128 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
129 iap->ia_valid |= ATTR_ATIME;
130 } else if (tmp == 2) { /* set to client time */
131 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
132 iap->ia_atime.tv_sec = ntohl(*p++);
133 iap->ia_atime.tv_nsec = ntohl(*p++);
134 }
135 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
136 iap->ia_valid |= ATTR_MTIME;
137 } else if (tmp == 2) { /* set to client time */
138 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
139 iap->ia_mtime.tv_sec = ntohl(*p++);
140 iap->ia_mtime.tv_nsec = ntohl(*p++);
141 }
142 return p;
143}
144
NeilBrownaf6a4e22007-02-14 00:33:12 -0800145static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp)
146{
147 u64 f;
148 switch(fsid_source(fhp)) {
149 default:
150 case FSIDSOURCE_DEV:
151 p = xdr_encode_hyper(p, (u64)huge_encode_dev
152 (fhp->fh_dentry->d_inode->i_sb->s_dev));
153 break;
154 case FSIDSOURCE_FSID:
155 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
156 break;
157 case FSIDSOURCE_UUID:
158 f = ((u64*)fhp->fh_export->ex_uuid)[0];
159 f ^= ((u64*)fhp->fh_export->ex_uuid)[1];
160 p = xdr_encode_hyper(p, f);
161 break;
162 }
163 return p;
164}
165
Adrian Bunk3ee6f612006-12-06 20:40:23 -0800166static __be32 *
Al Viro91f07162006-10-19 23:28:57 -0700167encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
David Shawa334de22006-01-06 00:19:58 -0800168 struct kstat *stat)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169{
David Shawa334de22006-01-06 00:19:58 -0800170 *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
171 *p++ = htonl((u32) stat->mode);
172 *p++ = htonl((u32) stat->nlink);
Eric W. Biederman458878a2013-02-02 04:16:08 -0800173 *p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
174 *p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid));
David Shawa334de22006-01-06 00:19:58 -0800175 if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
177 } else {
David Shawa334de22006-01-06 00:19:58 -0800178 p = xdr_encode_hyper(p, (u64) stat->size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 }
David Shawa334de22006-01-06 00:19:58 -0800180 p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
181 *p++ = htonl((u32) MAJOR(stat->rdev));
182 *p++ = htonl((u32) MINOR(stat->rdev));
NeilBrownaf6a4e22007-02-14 00:33:12 -0800183 p = encode_fsid(p, fhp);
Peter Staubach40ee5dc2007-08-16 12:10:07 -0400184 p = xdr_encode_hyper(p, stat->ino);
David Shawa334de22006-01-06 00:19:58 -0800185 p = encode_time3(p, &stat->atime);
Peter Staubach40ee5dc2007-08-16 12:10:07 -0400186 p = encode_time3(p, &stat->mtime);
David Shawa334de22006-01-06 00:19:58 -0800187 p = encode_time3(p, &stat->ctime);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188
189 return p;
190}
191
Adrian Bunk3ee6f612006-12-06 20:40:23 -0800192static __be32 *
Al Viro91f07162006-10-19 23:28:57 -0700193encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 /* Attributes to follow */
196 *p++ = xdr_one;
Peter Staubach40ee5dc2007-08-16 12:10:07 -0400197 return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198}
199
200/*
201 * Encode post-operation attributes.
202 * The inode may be NULL if the call failed because of a stale file
203 * handle. In this case, no attributes are returned.
204 */
Al Viro91f07162006-10-19 23:28:57 -0700205static __be32 *
206encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207{
208 struct dentry *dentry = fhp->fh_dentry;
NeilBrown072f62e2007-05-09 02:34:57 -0700209 if (dentry && dentry->d_inode) {
Al Viro3dadecc2013-01-24 02:18:08 -0500210 __be32 err;
David Shawa334de22006-01-06 00:19:58 -0800211 struct kstat stat;
212
Al Viro3dadecc2013-01-24 02:18:08 -0500213 err = fh_getattr(fhp, &stat);
David Shawa334de22006-01-06 00:19:58 -0800214 if (!err) {
215 *p++ = xdr_one; /* attributes follow */
Peter Staubach40ee5dc2007-08-16 12:10:07 -0400216 lease_get_mtime(dentry->d_inode, &stat.mtime);
David Shawa334de22006-01-06 00:19:58 -0800217 return encode_fattr3(rqstp, p, fhp, &stat);
218 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 }
220 *p++ = xdr_zero;
221 return p;
222}
223
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +0000224/* Helper for NFSv3 ACLs */
Al Viro91f07162006-10-19 23:28:57 -0700225__be32 *
226nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +0000227{
228 return encode_post_op_attr(rqstp, p, fhp);
229}
230
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231/*
232 * Enocde weak cache consistency data
233 */
Al Viro91f07162006-10-19 23:28:57 -0700234static __be32 *
235encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236{
237 struct dentry *dentry = fhp->fh_dentry;
238
239 if (dentry && dentry->d_inode && fhp->fh_post_saved) {
240 if (fhp->fh_pre_saved) {
241 *p++ = xdr_one;
242 p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
243 p = encode_time3(p, &fhp->fh_pre_mtime);
244 p = encode_time3(p, &fhp->fh_pre_ctime);
245 } else {
246 *p++ = xdr_zero;
247 }
248 return encode_saved_post_attr(rqstp, p, fhp);
249 }
250 /* no pre- or post-attrs */
251 *p++ = xdr_zero;
252 return encode_post_op_attr(rqstp, p, fhp);
253}
254
Peter Staubach40ee5dc2007-08-16 12:10:07 -0400255/*
256 * Fill in the post_op attr for the wcc data
257 */
258void fill_post_wcc(struct svc_fh *fhp)
259{
Al Viro3dadecc2013-01-24 02:18:08 -0500260 __be32 err;
Peter Staubach40ee5dc2007-08-16 12:10:07 -0400261
262 if (fhp->fh_post_saved)
263 printk("nfsd: inode locked twice during operation.\n");
264
Al Viro3dadecc2013-01-24 02:18:08 -0500265 err = fh_getattr(fhp, &fhp->fh_post_attr);
J. Bruce Fieldsc654b8a2009-04-16 17:33:25 -0400266 fhp->fh_post_change = fhp->fh_dentry->d_inode->i_version;
Neil Brownc1ac3ff2010-12-02 11:14:30 +1100267 if (err) {
Peter Staubach40ee5dc2007-08-16 12:10:07 -0400268 fhp->fh_post_saved = 0;
Neil Brownc1ac3ff2010-12-02 11:14:30 +1100269 /* Grab the ctime anyway - set_change_info might use it */
270 fhp->fh_post_attr.ctime = fhp->fh_dentry->d_inode->i_ctime;
271 } else
Peter Staubach40ee5dc2007-08-16 12:10:07 -0400272 fhp->fh_post_saved = 1;
273}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274
275/*
276 * XDR decode functions
277 */
278int
Al Viro91f07162006-10-19 23:28:57 -0700279nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280{
281 if (!(p = decode_fh(p, &args->fh)))
282 return 0;
283 return xdr_argsize_check(rqstp, p);
284}
285
286int
Al Viro91f07162006-10-19 23:28:57 -0700287nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 struct nfsd3_sattrargs *args)
289{
NeilBrown072f62e2007-05-09 02:34:57 -0700290 if (!(p = decode_fh(p, &args->fh)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 return 0;
NeilBrown072f62e2007-05-09 02:34:57 -0700292 p = decode_sattr3(p, &args->attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293
294 if ((args->check_guard = ntohl(*p++)) != 0) {
295 struct timespec time;
296 p = decode_time3(p, &time);
297 args->guardtime = time.tv_sec;
298 }
299
300 return xdr_argsize_check(rqstp, p);
301}
302
303int
Al Viro91f07162006-10-19 23:28:57 -0700304nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 struct nfsd3_diropargs *args)
306{
307 if (!(p = decode_fh(p, &args->fh))
308 || !(p = decode_filename(p, &args->name, &args->len)))
309 return 0;
310
311 return xdr_argsize_check(rqstp, p);
312}
313
314int
Al Viro91f07162006-10-19 23:28:57 -0700315nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 struct nfsd3_accessargs *args)
317{
318 if (!(p = decode_fh(p, &args->fh)))
319 return 0;
320 args->access = ntohl(*p++);
321
322 return xdr_argsize_check(rqstp, p);
323}
324
325int
Al Viro91f07162006-10-19 23:28:57 -0700326nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 struct nfsd3_readargs *args)
328{
329 unsigned int len;
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500330 int v;
Greg Banks7adae482006-10-04 02:15:47 -0700331 u32 max_blocksize = svc_max_payload(rqstp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332
NeilBrown072f62e2007-05-09 02:34:57 -0700333 if (!(p = decode_fh(p, &args->fh)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 return 0;
NeilBrown072f62e2007-05-09 02:34:57 -0700335 p = xdr_decode_hyper(p, &args->offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336
337 len = args->count = ntohl(*p++);
338
Greg Banks7adae482006-10-04 02:15:47 -0700339 if (len > max_blocksize)
340 len = max_blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341
342 /* set up the kvec */
343 v=0;
344 while (len > 0) {
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500345 struct page *p = *(rqstp->rq_next_page++);
346
347 rqstp->rq_vec[v].iov_base = page_address(p);
NeilBrown3cc03b12006-10-04 02:15:47 -0700348 rqstp->rq_vec[v].iov_len = len < PAGE_SIZE? len : PAGE_SIZE;
349 len -= rqstp->rq_vec[v].iov_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 v++;
351 }
352 args->vlen = v;
353 return xdr_argsize_check(rqstp, p);
354}
355
356int
Al Viro91f07162006-10-19 23:28:57 -0700357nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 struct nfsd3_writeargs *args)
359{
Peter Staubachf34b9562007-05-09 02:34:48 -0700360 unsigned int len, v, hdr, dlen;
Greg Banks7adae482006-10-04 02:15:47 -0700361 u32 max_blocksize = svc_max_payload(rqstp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362
NeilBrown072f62e2007-05-09 02:34:57 -0700363 if (!(p = decode_fh(p, &args->fh)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 return 0;
NeilBrown072f62e2007-05-09 02:34:57 -0700365 p = xdr_decode_hyper(p, &args->offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366
367 args->count = ntohl(*p++);
368 args->stable = ntohl(*p++);
369 len = args->len = ntohl(*p++);
Peter Staubachf34b9562007-05-09 02:34:48 -0700370 /*
371 * The count must equal the amount of data passed.
372 */
373 if (args->count != args->len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 return 0;
375
Peter Staubachf34b9562007-05-09 02:34:48 -0700376 /*
377 * Check to make sure that we got the right number of
378 * bytes.
Peter Staubachf34b9562007-05-09 02:34:48 -0700379 */
380 hdr = (void*)p - rqstp->rq_arg.head[0].iov_base;
NeilBrown072f62e2007-05-09 02:34:57 -0700381 dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len
382 - hdr;
Peter Staubachf34b9562007-05-09 02:34:48 -0700383 /*
384 * Round the length of the data which was specified up to
385 * the next multiple of XDR units and then compare that
386 * against the length which was actually received.
NeilBrownba67a392008-01-11 17:06:52 -0500387 * Note that when RPCSEC/GSS (for example) is used, the
388 * data buffer can be padded so dlen might be larger
389 * than required. It must never be smaller.
Peter Staubachf34b9562007-05-09 02:34:48 -0700390 */
NeilBrownba67a392008-01-11 17:06:52 -0500391 if (dlen < XDR_QUADLEN(len)*4)
Peter Staubachf34b9562007-05-09 02:34:48 -0700392 return 0;
393
394 if (args->count > max_blocksize) {
395 args->count = max_blocksize;
396 len = args->len = max_blocksize;
397 }
NeilBrown3cc03b12006-10-04 02:15:47 -0700398 rqstp->rq_vec[0].iov_base = (void*)p;
399 rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
Peter Staubachf34b9562007-05-09 02:34:48 -0700400 v = 0;
NeilBrown3cc03b12006-10-04 02:15:47 -0700401 while (len > rqstp->rq_vec[v].iov_len) {
402 len -= rqstp->rq_vec[v].iov_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 v++;
NeilBrown3cc03b12006-10-04 02:15:47 -0700404 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
405 rqstp->rq_vec[v].iov_len = PAGE_SIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 }
NeilBrown3cc03b12006-10-04 02:15:47 -0700407 rqstp->rq_vec[v].iov_len = len;
Peter Staubachf34b9562007-05-09 02:34:48 -0700408 args->vlen = v + 1;
409 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410}
411
412int
Al Viro91f07162006-10-19 23:28:57 -0700413nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 struct nfsd3_createargs *args)
415{
416 if (!(p = decode_fh(p, &args->fh))
417 || !(p = decode_filename(p, &args->name, &args->len)))
418 return 0;
419
420 switch (args->createmode = ntohl(*p++)) {
421 case NFS3_CREATE_UNCHECKED:
422 case NFS3_CREATE_GUARDED:
NeilBrown072f62e2007-05-09 02:34:57 -0700423 p = decode_sattr3(p, &args->attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 break;
425 case NFS3_CREATE_EXCLUSIVE:
426 args->verf = p;
427 p += 2;
428 break;
429 default:
430 return 0;
431 }
432
433 return xdr_argsize_check(rqstp, p);
434}
435int
Al Viro91f07162006-10-19 23:28:57 -0700436nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 struct nfsd3_createargs *args)
438{
NeilBrown072f62e2007-05-09 02:34:57 -0700439 if (!(p = decode_fh(p, &args->fh)) ||
440 !(p = decode_filename(p, &args->name, &args->len)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 return 0;
NeilBrown072f62e2007-05-09 02:34:57 -0700442 p = decode_sattr3(p, &args->attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443
444 return xdr_argsize_check(rqstp, p);
445}
446
447int
Al Viro91f07162006-10-19 23:28:57 -0700448nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 struct nfsd3_symlinkargs *args)
450{
Chuck Levera628f662007-11-01 16:57:20 -0400451 unsigned int len, avail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 char *old, *new;
453 struct kvec *vec;
454
NeilBrown072f62e2007-05-09 02:34:57 -0700455 if (!(p = decode_fh(p, &args->ffh)) ||
456 !(p = decode_filename(p, &args->fname, &args->flen))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 )
458 return 0;
NeilBrown072f62e2007-05-09 02:34:57 -0700459 p = decode_sattr3(p, &args->attrs);
460
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 /* now decode the pathname, which might be larger than the first page.
462 * As we have to check for nul's anyway, we copy it into a new page
463 * This page appears in the rq_res.pages list, but as pages_len is always
464 * 0, it won't get in the way
465 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 len = ntohl(*p++);
467 if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE)
468 return 0;
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500469 args->tname = new = page_address(*(rqstp->rq_next_page++));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 args->tlen = len;
471 /* first copy and check from the first page */
472 old = (char*)p;
473 vec = &rqstp->rq_arg.head[0];
474 avail = vec->iov_len - (old - (char*)vec->iov_base);
475 while (len && avail && *old) {
476 *new++ = *old++;
477 len--;
478 avail--;
479 }
480 /* now copy next page if there is one */
481 if (len && !avail && rqstp->rq_arg.page_len) {
482 avail = rqstp->rq_arg.page_len;
Chuck Levera628f662007-11-01 16:57:20 -0400483 if (avail > PAGE_SIZE)
484 avail = PAGE_SIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 old = page_address(rqstp->rq_arg.pages[0]);
486 }
487 while (len && avail && *old) {
488 *new++ = *old++;
489 len--;
490 avail--;
491 }
492 *new = '\0';
493 if (len)
494 return 0;
495
496 return 1;
497}
498
499int
Al Viro91f07162006-10-19 23:28:57 -0700500nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 struct nfsd3_mknodargs *args)
502{
503 if (!(p = decode_fh(p, &args->fh))
504 || !(p = decode_filename(p, &args->name, &args->len)))
505 return 0;
506
507 args->ftype = ntohl(*p++);
508
509 if (args->ftype == NF3BLK || args->ftype == NF3CHR
NeilBrown072f62e2007-05-09 02:34:57 -0700510 || args->ftype == NF3SOCK || args->ftype == NF3FIFO)
511 p = decode_sattr3(p, &args->attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512
513 if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
514 args->major = ntohl(*p++);
515 args->minor = ntohl(*p++);
516 }
517
518 return xdr_argsize_check(rqstp, p);
519}
520
521int
Al Viro91f07162006-10-19 23:28:57 -0700522nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 struct nfsd3_renameargs *args)
524{
525 if (!(p = decode_fh(p, &args->ffh))
526 || !(p = decode_filename(p, &args->fname, &args->flen))
527 || !(p = decode_fh(p, &args->tfh))
528 || !(p = decode_filename(p, &args->tname, &args->tlen)))
529 return 0;
530
531 return xdr_argsize_check(rqstp, p);
532}
533
534int
Al Viro91f07162006-10-19 23:28:57 -0700535nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 struct nfsd3_readlinkargs *args)
537{
538 if (!(p = decode_fh(p, &args->fh)))
539 return 0;
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500540 args->buffer = page_address(*(rqstp->rq_next_page++));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541
542 return xdr_argsize_check(rqstp, p);
543}
544
545int
Al Viro91f07162006-10-19 23:28:57 -0700546nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 struct nfsd3_linkargs *args)
548{
549 if (!(p = decode_fh(p, &args->ffh))
550 || !(p = decode_fh(p, &args->tfh))
551 || !(p = decode_filename(p, &args->tname, &args->tlen)))
552 return 0;
553
554 return xdr_argsize_check(rqstp, p);
555}
556
557int
Al Viro91f07162006-10-19 23:28:57 -0700558nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 struct nfsd3_readdirargs *args)
560{
561 if (!(p = decode_fh(p, &args->fh)))
562 return 0;
563 p = xdr_decode_hyper(p, &args->cookie);
564 args->verf = p; p += 2;
565 args->dircount = ~0;
566 args->count = ntohl(*p++);
567
568 if (args->count > PAGE_SIZE)
569 args->count = PAGE_SIZE;
570
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500571 args->buffer = page_address(*(rqstp->rq_next_page++));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572
573 return xdr_argsize_check(rqstp, p);
574}
575
576int
Al Viro91f07162006-10-19 23:28:57 -0700577nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 struct nfsd3_readdirargs *args)
579{
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500580 int len;
Greg Banks7adae482006-10-04 02:15:47 -0700581 u32 max_blocksize = svc_max_payload(rqstp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582
583 if (!(p = decode_fh(p, &args->fh)))
584 return 0;
585 p = xdr_decode_hyper(p, &args->cookie);
586 args->verf = p; p += 2;
587 args->dircount = ntohl(*p++);
588 args->count = ntohl(*p++);
589
Greg Banks7adae482006-10-04 02:15:47 -0700590 len = (args->count > max_blocksize) ? max_blocksize :
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 args->count;
592 args->count = len;
593
594 while (len > 0) {
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500595 struct page *p = *(rqstp->rq_next_page++);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 if (!args->buffer)
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500597 args->buffer = page_address(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 len -= PAGE_SIZE;
599 }
600
601 return xdr_argsize_check(rqstp, p);
602}
603
604int
Al Viro91f07162006-10-19 23:28:57 -0700605nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 struct nfsd3_commitargs *args)
607{
608 if (!(p = decode_fh(p, &args->fh)))
609 return 0;
610 p = xdr_decode_hyper(p, &args->offset);
611 args->count = ntohl(*p++);
612
613 return xdr_argsize_check(rqstp, p);
614}
615
616/*
617 * XDR encode functions
618 */
619/*
620 * There must be an encoding function for void results so svc_process
621 * will work properly.
622 */
623int
Al Viro91f07162006-10-19 23:28:57 -0700624nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625{
626 return xdr_ressize_check(rqstp, p);
627}
628
629/* GETATTR */
630int
Al Viro91f07162006-10-19 23:28:57 -0700631nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 struct nfsd3_attrstat *resp)
633{
Peter Staubach40ee5dc2007-08-16 12:10:07 -0400634 if (resp->status == 0) {
635 lease_get_mtime(resp->fh.fh_dentry->d_inode,
636 &resp->stat.mtime);
David Shawa334de22006-01-06 00:19:58 -0800637 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
Peter Staubach40ee5dc2007-08-16 12:10:07 -0400638 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 return xdr_ressize_check(rqstp, p);
640}
641
642/* SETATTR, REMOVE, RMDIR */
643int
Al Viro91f07162006-10-19 23:28:57 -0700644nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 struct nfsd3_attrstat *resp)
646{
647 p = encode_wcc_data(rqstp, p, &resp->fh);
648 return xdr_ressize_check(rqstp, p);
649}
650
651/* LOOKUP */
652int
Al Viro91f07162006-10-19 23:28:57 -0700653nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 struct nfsd3_diropres *resp)
655{
656 if (resp->status == 0) {
657 p = encode_fh(p, &resp->fh);
658 p = encode_post_op_attr(rqstp, p, &resp->fh);
659 }
660 p = encode_post_op_attr(rqstp, p, &resp->dirfh);
661 return xdr_ressize_check(rqstp, p);
662}
663
664/* ACCESS */
665int
Al Viro91f07162006-10-19 23:28:57 -0700666nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 struct nfsd3_accessres *resp)
668{
669 p = encode_post_op_attr(rqstp, p, &resp->fh);
670 if (resp->status == 0)
671 *p++ = htonl(resp->access);
672 return xdr_ressize_check(rqstp, p);
673}
674
675/* READLINK */
676int
Al Viro91f07162006-10-19 23:28:57 -0700677nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 struct nfsd3_readlinkres *resp)
679{
680 p = encode_post_op_attr(rqstp, p, &resp->fh);
681 if (resp->status == 0) {
682 *p++ = htonl(resp->len);
683 xdr_ressize_check(rqstp, p);
684 rqstp->rq_res.page_len = resp->len;
685 if (resp->len & 3) {
686 /* need to pad the tail */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 rqstp->rq_res.tail[0].iov_base = p;
688 *p = 0;
689 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
690 }
691 return 1;
692 } else
693 return xdr_ressize_check(rqstp, p);
694}
695
696/* READ */
697int
Al Viro91f07162006-10-19 23:28:57 -0700698nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 struct nfsd3_readres *resp)
700{
701 p = encode_post_op_attr(rqstp, p, &resp->fh);
702 if (resp->status == 0) {
703 *p++ = htonl(resp->count);
704 *p++ = htonl(resp->eof);
705 *p++ = htonl(resp->count); /* xdr opaque count */
706 xdr_ressize_check(rqstp, p);
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300707 /* now update rqstp->rq_res to reflect data as well */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 rqstp->rq_res.page_len = resp->count;
709 if (resp->count & 3) {
710 /* need to pad the tail */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 rqstp->rq_res.tail[0].iov_base = p;
712 *p = 0;
713 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
714 }
715 return 1;
716 } else
717 return xdr_ressize_check(rqstp, p);
718}
719
720/* WRITE */
721int
Al Viro91f07162006-10-19 23:28:57 -0700722nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 struct nfsd3_writeres *resp)
724{
Stanislav Kinsburskyb9c0ef82012-12-06 14:23:19 +0300725 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
726
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 p = encode_wcc_data(rqstp, p, &resp->fh);
728 if (resp->status == 0) {
729 *p++ = htonl(resp->count);
730 *p++ = htonl(resp->committed);
Stanislav Kinsburskyb9c0ef82012-12-06 14:23:19 +0300731 *p++ = htonl(nn->nfssvc_boot.tv_sec);
732 *p++ = htonl(nn->nfssvc_boot.tv_usec);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 }
734 return xdr_ressize_check(rqstp, p);
735}
736
737/* CREATE, MKDIR, SYMLINK, MKNOD */
738int
Al Viro91f07162006-10-19 23:28:57 -0700739nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 struct nfsd3_diropres *resp)
741{
742 if (resp->status == 0) {
743 *p++ = xdr_one;
744 p = encode_fh(p, &resp->fh);
745 p = encode_post_op_attr(rqstp, p, &resp->fh);
746 }
747 p = encode_wcc_data(rqstp, p, &resp->dirfh);
748 return xdr_ressize_check(rqstp, p);
749}
750
751/* RENAME */
752int
Al Viro91f07162006-10-19 23:28:57 -0700753nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754 struct nfsd3_renameres *resp)
755{
756 p = encode_wcc_data(rqstp, p, &resp->ffh);
757 p = encode_wcc_data(rqstp, p, &resp->tfh);
758 return xdr_ressize_check(rqstp, p);
759}
760
761/* LINK */
762int
Al Viro91f07162006-10-19 23:28:57 -0700763nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764 struct nfsd3_linkres *resp)
765{
766 p = encode_post_op_attr(rqstp, p, &resp->fh);
767 p = encode_wcc_data(rqstp, p, &resp->tfh);
768 return xdr_ressize_check(rqstp, p);
769}
770
771/* READDIR */
772int
Al Viro91f07162006-10-19 23:28:57 -0700773nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 struct nfsd3_readdirres *resp)
775{
776 p = encode_post_op_attr(rqstp, p, &resp->fh);
777
778 if (resp->status == 0) {
779 /* stupid readdir cookie */
780 memcpy(p, resp->verf, 8); p += 2;
781 xdr_ressize_check(rqstp, p);
782 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
783 return 1; /*No room for trailer */
784 rqstp->rq_res.page_len = (resp->count) << 2;
785
786 /* add the 'tail' to the end of the 'head' page - page 0. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 rqstp->rq_res.tail[0].iov_base = p;
788 *p++ = 0; /* no more entries */
789 *p++ = htonl(resp->common.err == nfserr_eof);
790 rqstp->rq_res.tail[0].iov_len = 2<<2;
791 return 1;
792 } else
793 return xdr_ressize_check(rqstp, p);
794}
795
Adrian Bunk3ee6f612006-12-06 20:40:23 -0800796static __be32 *
Al Viro91f07162006-10-19 23:28:57 -0700797encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
Peter Staubach40ee5dc2007-08-16 12:10:07 -0400798 int namlen, u64 ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799{
800 *p++ = xdr_one; /* mark entry present */
801 p = xdr_encode_hyper(p, ino); /* file id */
802 p = xdr_encode_array(p, name, namlen);/* name length & name */
803
804 cd->offset = p; /* remember pointer */
805 p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
806
807 return p;
808}
809
Al Viroefe39652012-04-13 00:32:14 -0400810static __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
812 const char *name, int namlen)
813{
814 struct svc_export *exp;
815 struct dentry *dparent, *dchild;
Al Viroefe39652012-04-13 00:32:14 -0400816 __be32 rv = nfserr_noent;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817
818 dparent = cd->fh.fh_dentry;
819 exp = cd->fh.fh_export;
820
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 if (isdotent(name, namlen)) {
822 if (namlen == 2) {
823 dchild = dget_parent(dparent);
Al Viroefe39652012-04-13 00:32:14 -0400824 /* filesystem root - cannot return filehandle for ".." */
825 if (dchild == dparent)
826 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 } else
828 dchild = dget(dparent);
829 } else
830 dchild = lookup_one_len(name, dparent, namlen);
831 if (IS_ERR(dchild))
Al Viroefe39652012-04-13 00:32:14 -0400832 return rv;
J. Bruce Fields8177e6d2009-09-04 14:13:09 -0400833 if (d_mountpoint(dchild))
834 goto out;
J. Bruce Fields8177e6d2009-09-04 14:13:09 -0400835 if (!dchild->d_inode)
836 goto out;
Al Viroefe39652012-04-13 00:32:14 -0400837 rv = fh_compose(fhp, exp, dchild, &cd->fh);
J. Bruce Fields8177e6d2009-09-04 14:13:09 -0400838out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839 dput(dchild);
840 return rv;
841}
842
Daniel Mackc47d8322011-05-16 16:38:14 +0200843static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen)
J. Bruce Fields8177e6d2009-09-04 14:13:09 -0400844{
845 struct svc_fh fh;
Al Viroefe39652012-04-13 00:32:14 -0400846 __be32 err;
J. Bruce Fields8177e6d2009-09-04 14:13:09 -0400847
J. Bruce Fieldsaed100f2009-09-04 14:40:36 -0400848 fh_init(&fh, NFS3_FHSIZE);
J. Bruce Fields8177e6d2009-09-04 14:13:09 -0400849 err = compose_entry_fh(cd, &fh, name, namlen);
850 if (err) {
851 *p++ = 0;
852 *p++ = 0;
J. Bruce Fieldsaed100f2009-09-04 14:40:36 -0400853 goto out;
J. Bruce Fields8177e6d2009-09-04 14:13:09 -0400854 }
855 p = encode_post_op_attr(cd->rqstp, p, &fh);
856 *p++ = xdr_one; /* yes, a file handle follows */
857 p = encode_fh(p, &fh);
J. Bruce Fieldsaed100f2009-09-04 14:40:36 -0400858out:
J. Bruce Fields8177e6d2009-09-04 14:13:09 -0400859 fh_put(&fh);
860 return p;
861}
862
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863/*
864 * Encode a directory entry. This one works for both normal readdir
865 * and readdirplus.
866 * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
867 * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
868 *
869 * The readdirplus baggage is 1+21 words for post_op_attr, plus the
870 * file handle.
871 */
872
873#define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1)
874#define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
875static int
NeilBrown598b9a52007-03-26 21:32:08 -0800876encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
Peter Staubach40ee5dc2007-08-16 12:10:07 -0400877 loff_t offset, u64 ino, unsigned int d_type, int plus)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878{
879 struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
880 common);
Al Viro91f07162006-10-19 23:28:57 -0700881 __be32 *p = cd->buffer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882 caddr_t curr_page_addr = NULL;
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500883 struct page ** page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884 int slen; /* string (name) length */
885 int elen; /* estimated entry length in words */
886 int num_entry_words = 0; /* actual number of words */
887
888 if (cd->offset) {
889 u64 offset64 = offset;
890
891 if (unlikely(cd->offset1)) {
892 /* we ended up with offset on a page boundary */
893 *cd->offset = htonl(offset64 >> 32);
894 *cd->offset1 = htonl(offset64 & 0xffffffff);
895 cd->offset1 = NULL;
896 } else {
NeilBrown598b9a52007-03-26 21:32:08 -0800897 xdr_encode_hyper(cd->offset, offset64);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 }
899 }
900
901 /*
902 dprintk("encode_entry(%.*s @%ld%s)\n",
903 namlen, name, (long) offset, plus? " plus" : "");
904 */
905
906 /* truncate filename if too long */
907 if (namlen > NFS3_MAXNAMLEN)
908 namlen = NFS3_MAXNAMLEN;
909
910 slen = XDR_QUADLEN(namlen);
911 elen = slen + NFS3_ENTRY_BAGGAGE
912 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
913
914 if (cd->buflen < elen) {
915 cd->common.err = nfserr_toosmall;
916 return -EINVAL;
917 }
918
919 /* determine which page in rq_respages[] we are currently filling */
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500920 for (page = cd->rqstp->rq_respages + 1;
921 page < cd->rqstp->rq_next_page; page++) {
922 curr_page_addr = page_address(*page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923
924 if (((caddr_t)cd->buffer >= curr_page_addr) &&
925 ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE))
926 break;
927 }
928
929 if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
930 /* encode entry in current page */
931
932 p = encode_entry_baggage(cd, p, name, namlen, ino);
933
J. Bruce Fields8177e6d2009-09-04 14:13:09 -0400934 if (plus)
935 p = encode_entryplus_baggage(cd, p, name, namlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936 num_entry_words = p - cd->buffer;
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500937 } else if (*(page+1) != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 /* temporarily encode entry into next page, then move back to
939 * current and next page in rq_respages[] */
Al Viro91f07162006-10-19 23:28:57 -0700940 __be32 *p1, *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941 int len1, len2;
942
943 /* grab next page for temporary storage of entry */
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500944 p1 = tmp = page_address(*(page+1));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945
946 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
947
J. Bruce Fields8177e6d2009-09-04 14:13:09 -0400948 if (plus)
Petr Vandrovec479c2552009-11-14 10:47:07 +0100949 p1 = encode_entryplus_baggage(cd, p1, name, namlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950
951 /* determine entry word length and lengths to go in pages */
952 num_entry_words = p1 - tmp;
953 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
954 if ((num_entry_words << 2) < len1) {
955 /* the actual number of words in the entry is less
956 * than elen and can still fit in the current page
957 */
958 memmove(p, tmp, num_entry_words << 2);
959 p += num_entry_words;
960
961 /* update offset */
962 cd->offset = cd->buffer + (cd->offset - tmp);
963 } else {
964 unsigned int offset_r = (cd->offset - tmp) << 2;
965
966 /* update pointer to offset location.
967 * This is a 64bit quantity, so we need to
968 * deal with 3 cases:
969 * - entirely in first page
970 * - entirely in second page
971 * - 4 bytes in each page
972 */
973 if (offset_r + 8 <= len1) {
974 cd->offset = p + (cd->offset - tmp);
975 } else if (offset_r >= len1) {
976 cd->offset -= len1 >> 2;
977 } else {
978 /* sitting on the fence */
979 BUG_ON(offset_r != len1 - 4);
980 cd->offset = p + (cd->offset - tmp);
981 cd->offset1 = tmp;
982 }
983
984 len2 = (num_entry_words << 2) - len1;
985
986 /* move from temp page to current and next pages */
987 memmove(p, tmp, len1);
988 memmove(tmp, (caddr_t)tmp+len1, len2);
989
990 p = tmp + (len2 >> 2);
991 }
992 }
993 else {
994 cd->common.err = nfserr_toosmall;
995 return -EINVAL;
996 }
997
998 cd->buflen -= num_entry_words;
999 cd->buffer = p;
1000 cd->common.err = nfs_ok;
1001 return 0;
1002
1003}
1004
1005int
NeilBrowna0ad13e2007-01-26 00:57:10 -08001006nfs3svc_encode_entry(void *cd, const char *name,
1007 int namlen, loff_t offset, u64 ino, unsigned int d_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008{
1009 return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
1010}
1011
1012int
NeilBrowna0ad13e2007-01-26 00:57:10 -08001013nfs3svc_encode_entry_plus(void *cd, const char *name,
1014 int namlen, loff_t offset, u64 ino,
1015 unsigned int d_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016{
1017 return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1018}
1019
1020/* FSSTAT */
1021int
Al Viro91f07162006-10-19 23:28:57 -07001022nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 struct nfsd3_fsstatres *resp)
1024{
1025 struct kstatfs *s = &resp->stats;
1026 u64 bs = s->f_bsize;
1027
1028 *p++ = xdr_zero; /* no post_op_attr */
1029
1030 if (resp->status == 0) {
1031 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */
1032 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */
1033 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */
1034 p = xdr_encode_hyper(p, s->f_files); /* total inodes */
1035 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */
1036 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */
1037 *p++ = htonl(resp->invarsec); /* mean unchanged time */
1038 }
1039 return xdr_ressize_check(rqstp, p);
1040}
1041
1042/* FSINFO */
1043int
Al Viro91f07162006-10-19 23:28:57 -07001044nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045 struct nfsd3_fsinfores *resp)
1046{
1047 *p++ = xdr_zero; /* no post_op_attr */
1048
1049 if (resp->status == 0) {
1050 *p++ = htonl(resp->f_rtmax);
1051 *p++ = htonl(resp->f_rtpref);
1052 *p++ = htonl(resp->f_rtmult);
1053 *p++ = htonl(resp->f_wtmax);
1054 *p++ = htonl(resp->f_wtpref);
1055 *p++ = htonl(resp->f_wtmult);
1056 *p++ = htonl(resp->f_dtpref);
1057 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1058 *p++ = xdr_one;
1059 *p++ = xdr_zero;
1060 *p++ = htonl(resp->f_properties);
1061 }
1062
1063 return xdr_ressize_check(rqstp, p);
1064}
1065
1066/* PATHCONF */
1067int
Al Viro91f07162006-10-19 23:28:57 -07001068nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069 struct nfsd3_pathconfres *resp)
1070{
1071 *p++ = xdr_zero; /* no post_op_attr */
1072
1073 if (resp->status == 0) {
1074 *p++ = htonl(resp->p_link_max);
1075 *p++ = htonl(resp->p_name_max);
1076 *p++ = htonl(resp->p_no_trunc);
1077 *p++ = htonl(resp->p_chown_restricted);
1078 *p++ = htonl(resp->p_case_insensitive);
1079 *p++ = htonl(resp->p_case_preserving);
1080 }
1081
1082 return xdr_ressize_check(rqstp, p);
1083}
1084
1085/* COMMIT */
1086int
Al Viro91f07162006-10-19 23:28:57 -07001087nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088 struct nfsd3_commitres *resp)
1089{
Stanislav Kinsburskyb9c0ef82012-12-06 14:23:19 +03001090 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1091
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092 p = encode_wcc_data(rqstp, p, &resp->fh);
1093 /* Write verifier */
1094 if (resp->status == 0) {
Stanislav Kinsburskyb9c0ef82012-12-06 14:23:19 +03001095 *p++ = htonl(nn->nfssvc_boot.tv_sec);
1096 *p++ = htonl(nn->nfssvc_boot.tv_usec);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097 }
1098 return xdr_ressize_check(rqstp, p);
1099}
1100
1101/*
1102 * XDR release functions
1103 */
1104int
Al Viro91f07162006-10-19 23:28:57 -07001105nfs3svc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 struct nfsd3_attrstat *resp)
1107{
1108 fh_put(&resp->fh);
1109 return 1;
1110}
1111
1112int
Al Viro91f07162006-10-19 23:28:57 -07001113nfs3svc_release_fhandle2(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114 struct nfsd3_fhandle_pair *resp)
1115{
1116 fh_put(&resp->fh1);
1117 fh_put(&resp->fh2);
1118 return 1;
1119}