blob: 452334694a5d1f37cc480e5d1cf2873c4246019d [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);
Kinglong Mee3c7aa152014-06-10 18:08:19 +0800123 iap->ia_size = min_t(u64, newsize, NFS_OFFSET_MAX);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 }
125 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
126 iap->ia_valid |= ATTR_ATIME;
127 } else if (tmp == 2) { /* set to client time */
128 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
129 iap->ia_atime.tv_sec = ntohl(*p++);
130 iap->ia_atime.tv_nsec = ntohl(*p++);
131 }
132 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
133 iap->ia_valid |= ATTR_MTIME;
134 } else if (tmp == 2) { /* set to client time */
135 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
136 iap->ia_mtime.tv_sec = ntohl(*p++);
137 iap->ia_mtime.tv_nsec = ntohl(*p++);
138 }
139 return p;
140}
141
NeilBrownaf6a4e22007-02-14 00:33:12 -0800142static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp)
143{
144 u64 f;
145 switch(fsid_source(fhp)) {
146 default:
147 case FSIDSOURCE_DEV:
148 p = xdr_encode_hyper(p, (u64)huge_encode_dev
Al Virofc640052016-04-10 01:33:30 -0400149 (fhp->fh_dentry->d_sb->s_dev));
NeilBrownaf6a4e22007-02-14 00:33:12 -0800150 break;
151 case FSIDSOURCE_FSID:
152 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
153 break;
154 case FSIDSOURCE_UUID:
155 f = ((u64*)fhp->fh_export->ex_uuid)[0];
156 f ^= ((u64*)fhp->fh_export->ex_uuid)[1];
157 p = xdr_encode_hyper(p, f);
158 break;
159 }
160 return p;
161}
162
Adrian Bunk3ee6f612006-12-06 20:40:23 -0800163static __be32 *
Al Viro91f07162006-10-19 23:28:57 -0700164encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
David Shawa334de22006-01-06 00:19:58 -0800165 struct kstat *stat)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166{
David Shawa334de22006-01-06 00:19:58 -0800167 *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
Albert Fluegel6e14b462013-11-18 12:18:01 -0500168 *p++ = htonl((u32) (stat->mode & S_IALLUGO));
David Shawa334de22006-01-06 00:19:58 -0800169 *p++ = htonl((u32) stat->nlink);
Eric W. Biederman458878a2013-02-02 04:16:08 -0800170 *p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
171 *p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid));
David Shawa334de22006-01-06 00:19:58 -0800172 if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
174 } else {
David Shawa334de22006-01-06 00:19:58 -0800175 p = xdr_encode_hyper(p, (u64) stat->size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 }
David Shawa334de22006-01-06 00:19:58 -0800177 p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
178 *p++ = htonl((u32) MAJOR(stat->rdev));
179 *p++ = htonl((u32) MINOR(stat->rdev));
NeilBrownaf6a4e22007-02-14 00:33:12 -0800180 p = encode_fsid(p, fhp);
Peter Staubach40ee5dc2007-08-16 12:10:07 -0400181 p = xdr_encode_hyper(p, stat->ino);
David Shawa334de22006-01-06 00:19:58 -0800182 p = encode_time3(p, &stat->atime);
Peter Staubach40ee5dc2007-08-16 12:10:07 -0400183 p = encode_time3(p, &stat->mtime);
David Shawa334de22006-01-06 00:19:58 -0800184 p = encode_time3(p, &stat->ctime);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185
186 return p;
187}
188
Adrian Bunk3ee6f612006-12-06 20:40:23 -0800189static __be32 *
Al Viro91f07162006-10-19 23:28:57 -0700190encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 /* Attributes to follow */
193 *p++ = xdr_one;
Peter Staubach40ee5dc2007-08-16 12:10:07 -0400194 return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195}
196
197/*
198 * Encode post-operation attributes.
199 * The inode may be NULL if the call failed because of a stale file
200 * handle. In this case, no attributes are returned.
201 */
Al Viro91f07162006-10-19 23:28:57 -0700202static __be32 *
203encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204{
205 struct dentry *dentry = fhp->fh_dentry;
David Howells2b0143b2015-03-17 22:25:59 +0000206 if (dentry && d_really_is_positive(dentry)) {
Al Viro3dadecc2013-01-24 02:18:08 -0500207 __be32 err;
David Shawa334de22006-01-06 00:19:58 -0800208 struct kstat stat;
209
Al Viro3dadecc2013-01-24 02:18:08 -0500210 err = fh_getattr(fhp, &stat);
David Shawa334de22006-01-06 00:19:58 -0800211 if (!err) {
212 *p++ = xdr_one; /* attributes follow */
David Howells2b0143b2015-03-17 22:25:59 +0000213 lease_get_mtime(d_inode(dentry), &stat.mtime);
David Shawa334de22006-01-06 00:19:58 -0800214 return encode_fattr3(rqstp, p, fhp, &stat);
215 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 }
217 *p++ = xdr_zero;
218 return p;
219}
220
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +0000221/* Helper for NFSv3 ACLs */
Al Viro91f07162006-10-19 23:28:57 -0700222__be32 *
223nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +0000224{
225 return encode_post_op_attr(rqstp, p, fhp);
226}
227
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228/*
229 * Enocde weak cache consistency data
230 */
Al Viro91f07162006-10-19 23:28:57 -0700231static __be32 *
232encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233{
234 struct dentry *dentry = fhp->fh_dentry;
235
David Howells2b0143b2015-03-17 22:25:59 +0000236 if (dentry && d_really_is_positive(dentry) && fhp->fh_post_saved) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 if (fhp->fh_pre_saved) {
238 *p++ = xdr_one;
239 p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
240 p = encode_time3(p, &fhp->fh_pre_mtime);
241 p = encode_time3(p, &fhp->fh_pre_ctime);
242 } else {
243 *p++ = xdr_zero;
244 }
245 return encode_saved_post_attr(rqstp, p, fhp);
246 }
247 /* no pre- or post-attrs */
248 *p++ = xdr_zero;
249 return encode_post_op_attr(rqstp, p, fhp);
250}
251
Peter Staubach40ee5dc2007-08-16 12:10:07 -0400252/*
253 * Fill in the post_op attr for the wcc data
254 */
255void fill_post_wcc(struct svc_fh *fhp)
256{
Al Viro3dadecc2013-01-24 02:18:08 -0500257 __be32 err;
Peter Staubach40ee5dc2007-08-16 12:10:07 -0400258
259 if (fhp->fh_post_saved)
260 printk("nfsd: inode locked twice during operation.\n");
261
Al Viro3dadecc2013-01-24 02:18:08 -0500262 err = fh_getattr(fhp, &fhp->fh_post_attr);
David Howells2b0143b2015-03-17 22:25:59 +0000263 fhp->fh_post_change = d_inode(fhp->fh_dentry)->i_version;
Neil Brownc1ac3ff2010-12-02 11:14:30 +1100264 if (err) {
Jeff Laytonaaf91ec2015-09-17 08:28:39 -0400265 fhp->fh_post_saved = false;
Neil Brownc1ac3ff2010-12-02 11:14:30 +1100266 /* Grab the ctime anyway - set_change_info might use it */
David Howells2b0143b2015-03-17 22:25:59 +0000267 fhp->fh_post_attr.ctime = d_inode(fhp->fh_dentry)->i_ctime;
Neil Brownc1ac3ff2010-12-02 11:14:30 +1100268 } else
Jeff Laytonaaf91ec2015-09-17 08:28:39 -0400269 fhp->fh_post_saved = true;
Peter Staubach40ee5dc2007-08-16 12:10:07 -0400270}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
272/*
273 * XDR decode functions
274 */
275int
Al Viro91f07162006-10-19 23:28:57 -0700276nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277{
Benoit Tained40aa332014-05-22 16:32:30 +0200278 p = decode_fh(p, &args->fh);
279 if (!p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 return 0;
281 return xdr_argsize_check(rqstp, p);
282}
283
284int
Al Viro91f07162006-10-19 23:28:57 -0700285nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 struct nfsd3_sattrargs *args)
287{
Benoit Tained40aa332014-05-22 16:32:30 +0200288 p = decode_fh(p, &args->fh);
289 if (!p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 return 0;
NeilBrown072f62e2007-05-09 02:34:57 -0700291 p = decode_sattr3(p, &args->attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292
293 if ((args->check_guard = ntohl(*p++)) != 0) {
294 struct timespec time;
295 p = decode_time3(p, &time);
296 args->guardtime = time.tv_sec;
297 }
298
299 return xdr_argsize_check(rqstp, p);
300}
301
302int
Al Viro91f07162006-10-19 23:28:57 -0700303nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 struct nfsd3_diropargs *args)
305{
306 if (!(p = decode_fh(p, &args->fh))
307 || !(p = decode_filename(p, &args->name, &args->len)))
308 return 0;
309
310 return xdr_argsize_check(rqstp, p);
311}
312
313int
Al Viro91f07162006-10-19 23:28:57 -0700314nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 struct nfsd3_accessargs *args)
316{
Benoit Tained40aa332014-05-22 16:32:30 +0200317 p = decode_fh(p, &args->fh);
318 if (!p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 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
Benoit Tained40aa332014-05-22 16:32:30 +0200333 p = decode_fh(p, &args->fh);
334 if (!p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 return 0;
NeilBrown072f62e2007-05-09 02:34:57 -0700336 p = xdr_decode_hyper(p, &args->offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337
Kinglong Mee3c7aa152014-06-10 18:08:19 +0800338 args->count = ntohl(*p++);
339 len = min(args->count, max_blocksize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340
341 /* set up the kvec */
342 v=0;
343 while (len > 0) {
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500344 struct page *p = *(rqstp->rq_next_page++);
345
346 rqstp->rq_vec[v].iov_base = page_address(p);
Kinglong Mee3c7aa152014-06-10 18:08:19 +0800347 rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
NeilBrown3cc03b12006-10-04 02:15:47 -0700348 len -= rqstp->rq_vec[v].iov_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 v++;
350 }
351 args->vlen = v;
352 return xdr_argsize_check(rqstp, p);
353}
354
355int
Al Viro91f07162006-10-19 23:28:57 -0700356nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 struct nfsd3_writeargs *args)
358{
Peter Staubachf34b9562007-05-09 02:34:48 -0700359 unsigned int len, v, hdr, dlen;
Greg Banks7adae482006-10-04 02:15:47 -0700360 u32 max_blocksize = svc_max_payload(rqstp);
J. Bruce Fields8ed07972017-04-25 16:21:34 -0400361 struct kvec *head = rqstp->rq_arg.head;
362 struct kvec *tail = rqstp->rq_arg.tail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363
Benoit Tained40aa332014-05-22 16:32:30 +0200364 p = decode_fh(p, &args->fh);
365 if (!p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 return 0;
NeilBrown072f62e2007-05-09 02:34:57 -0700367 p = xdr_decode_hyper(p, &args->offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368
369 args->count = ntohl(*p++);
370 args->stable = ntohl(*p++);
371 len = args->len = ntohl(*p++);
J. Bruce Fieldsd7809b92017-04-21 15:26:30 -0400372 if ((void *)p > head->iov_base + head->iov_len)
373 return 0;
Peter Staubachf34b9562007-05-09 02:34:48 -0700374 /*
375 * The count must equal the amount of data passed.
376 */
377 if (args->count != args->len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 return 0;
379
Peter Staubachf34b9562007-05-09 02:34:48 -0700380 /*
381 * Check to make sure that we got the right number of
382 * bytes.
Peter Staubachf34b9562007-05-09 02:34:48 -0700383 */
J. Bruce Fields8ed07972017-04-25 16:21:34 -0400384 hdr = (void*)p - head->iov_base;
385 dlen = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len - hdr;
Peter Staubachf34b9562007-05-09 02:34:48 -0700386 /*
387 * Round the length of the data which was specified up to
388 * the next multiple of XDR units and then compare that
389 * against the length which was actually received.
NeilBrownba67a392008-01-11 17:06:52 -0500390 * Note that when RPCSEC/GSS (for example) is used, the
391 * data buffer can be padded so dlen might be larger
392 * than required. It must never be smaller.
Peter Staubachf34b9562007-05-09 02:34:48 -0700393 */
NeilBrownba67a392008-01-11 17:06:52 -0500394 if (dlen < XDR_QUADLEN(len)*4)
Peter Staubachf34b9562007-05-09 02:34:48 -0700395 return 0;
396
397 if (args->count > max_blocksize) {
398 args->count = max_blocksize;
399 len = args->len = max_blocksize;
400 }
NeilBrown3cc03b12006-10-04 02:15:47 -0700401 rqstp->rq_vec[0].iov_base = (void*)p;
J. Bruce Fields8ed07972017-04-25 16:21:34 -0400402 rqstp->rq_vec[0].iov_len = head->iov_len - hdr;
Peter Staubachf34b9562007-05-09 02:34:48 -0700403 v = 0;
NeilBrown3cc03b12006-10-04 02:15:47 -0700404 while (len > rqstp->rq_vec[v].iov_len) {
405 len -= rqstp->rq_vec[v].iov_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 v++;
NeilBrown3cc03b12006-10-04 02:15:47 -0700407 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
408 rqstp->rq_vec[v].iov_len = PAGE_SIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 }
NeilBrown3cc03b12006-10-04 02:15:47 -0700410 rqstp->rq_vec[v].iov_len = len;
Peter Staubachf34b9562007-05-09 02:34:48 -0700411 args->vlen = v + 1;
412 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413}
414
415int
Al Viro91f07162006-10-19 23:28:57 -0700416nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 struct nfsd3_createargs *args)
418{
419 if (!(p = decode_fh(p, &args->fh))
420 || !(p = decode_filename(p, &args->name, &args->len)))
421 return 0;
422
423 switch (args->createmode = ntohl(*p++)) {
424 case NFS3_CREATE_UNCHECKED:
425 case NFS3_CREATE_GUARDED:
NeilBrown072f62e2007-05-09 02:34:57 -0700426 p = decode_sattr3(p, &args->attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 break;
428 case NFS3_CREATE_EXCLUSIVE:
429 args->verf = p;
430 p += 2;
431 break;
432 default:
433 return 0;
434 }
435
436 return xdr_argsize_check(rqstp, p);
437}
438int
Al Viro91f07162006-10-19 23:28:57 -0700439nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 struct nfsd3_createargs *args)
441{
NeilBrown072f62e2007-05-09 02:34:57 -0700442 if (!(p = decode_fh(p, &args->fh)) ||
443 !(p = decode_filename(p, &args->name, &args->len)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 return 0;
NeilBrown072f62e2007-05-09 02:34:57 -0700445 p = decode_sattr3(p, &args->attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446
447 return xdr_argsize_check(rqstp, p);
448}
449
450int
Al Viro91f07162006-10-19 23:28:57 -0700451nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 struct nfsd3_symlinkargs *args)
453{
Chuck Levera628f662007-11-01 16:57:20 -0400454 unsigned int len, avail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 char *old, *new;
456 struct kvec *vec;
457
NeilBrown072f62e2007-05-09 02:34:57 -0700458 if (!(p = decode_fh(p, &args->ffh)) ||
459 !(p = decode_filename(p, &args->fname, &args->flen))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 )
461 return 0;
NeilBrown072f62e2007-05-09 02:34:57 -0700462 p = decode_sattr3(p, &args->attrs);
463
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 /* now decode the pathname, which might be larger than the first page.
465 * As we have to check for nul's anyway, we copy it into a new page
466 * This page appears in the rq_res.pages list, but as pages_len is always
467 * 0, it won't get in the way
468 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 len = ntohl(*p++);
470 if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE)
471 return 0;
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500472 args->tname = new = page_address(*(rqstp->rq_next_page++));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 args->tlen = len;
474 /* first copy and check from the first page */
475 old = (char*)p;
476 vec = &rqstp->rq_arg.head[0];
J. Bruce Fieldsd7809b92017-04-21 15:26:30 -0400477 if ((void *)old > vec->iov_base + vec->iov_len)
478 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 avail = vec->iov_len - (old - (char*)vec->iov_base);
480 while (len && avail && *old) {
481 *new++ = *old++;
482 len--;
483 avail--;
484 }
485 /* now copy next page if there is one */
486 if (len && !avail && rqstp->rq_arg.page_len) {
Kinglong Mee3c7aa152014-06-10 18:08:19 +0800487 avail = min_t(unsigned int, rqstp->rq_arg.page_len, PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 old = page_address(rqstp->rq_arg.pages[0]);
489 }
490 while (len && avail && *old) {
491 *new++ = *old++;
492 len--;
493 avail--;
494 }
495 *new = '\0';
496 if (len)
497 return 0;
498
499 return 1;
500}
501
502int
Al Viro91f07162006-10-19 23:28:57 -0700503nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 struct nfsd3_mknodargs *args)
505{
506 if (!(p = decode_fh(p, &args->fh))
507 || !(p = decode_filename(p, &args->name, &args->len)))
508 return 0;
509
510 args->ftype = ntohl(*p++);
511
512 if (args->ftype == NF3BLK || args->ftype == NF3CHR
NeilBrown072f62e2007-05-09 02:34:57 -0700513 || args->ftype == NF3SOCK || args->ftype == NF3FIFO)
514 p = decode_sattr3(p, &args->attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515
516 if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
517 args->major = ntohl(*p++);
518 args->minor = ntohl(*p++);
519 }
520
521 return xdr_argsize_check(rqstp, p);
522}
523
524int
Al Viro91f07162006-10-19 23:28:57 -0700525nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 struct nfsd3_renameargs *args)
527{
528 if (!(p = decode_fh(p, &args->ffh))
529 || !(p = decode_filename(p, &args->fname, &args->flen))
530 || !(p = decode_fh(p, &args->tfh))
531 || !(p = decode_filename(p, &args->tname, &args->tlen)))
532 return 0;
533
534 return xdr_argsize_check(rqstp, p);
535}
536
537int
Al Viro91f07162006-10-19 23:28:57 -0700538nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 struct nfsd3_readlinkargs *args)
540{
Benoit Tained40aa332014-05-22 16:32:30 +0200541 p = decode_fh(p, &args->fh);
542 if (!p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 return 0;
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500544 args->buffer = page_address(*(rqstp->rq_next_page++));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545
546 return xdr_argsize_check(rqstp, p);
547}
548
549int
Al Viro91f07162006-10-19 23:28:57 -0700550nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 struct nfsd3_linkargs *args)
552{
553 if (!(p = decode_fh(p, &args->ffh))
554 || !(p = decode_fh(p, &args->tfh))
555 || !(p = decode_filename(p, &args->tname, &args->tlen)))
556 return 0;
557
558 return xdr_argsize_check(rqstp, p);
559}
560
561int
Al Viro91f07162006-10-19 23:28:57 -0700562nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 struct nfsd3_readdirargs *args)
564{
Benoit Tained40aa332014-05-22 16:32:30 +0200565 p = decode_fh(p, &args->fh);
566 if (!p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 return 0;
568 p = xdr_decode_hyper(p, &args->cookie);
569 args->verf = p; p += 2;
570 args->dircount = ~0;
571 args->count = ntohl(*p++);
Kinglong Mee3c7aa152014-06-10 18:08:19 +0800572 args->count = min_t(u32, args->count, PAGE_SIZE);
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500573 args->buffer = page_address(*(rqstp->rq_next_page++));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574
575 return xdr_argsize_check(rqstp, p);
576}
577
578int
Al Viro91f07162006-10-19 23:28:57 -0700579nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 struct nfsd3_readdirargs *args)
581{
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500582 int len;
Greg Banks7adae482006-10-04 02:15:47 -0700583 u32 max_blocksize = svc_max_payload(rqstp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584
Benoit Tained40aa332014-05-22 16:32:30 +0200585 p = decode_fh(p, &args->fh);
586 if (!p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 return 0;
588 p = xdr_decode_hyper(p, &args->cookie);
589 args->verf = p; p += 2;
590 args->dircount = ntohl(*p++);
591 args->count = ntohl(*p++);
592
Kinglong Mee3c7aa152014-06-10 18:08:19 +0800593 len = args->count = min(args->count, max_blocksize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 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{
Benoit Tained40aa332014-05-22 16:32:30 +0200608 p = decode_fh(p, &args->fh);
609 if (!p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 return 0;
611 p = xdr_decode_hyper(p, &args->offset);
612 args->count = ntohl(*p++);
613
614 return xdr_argsize_check(rqstp, p);
615}
616
617/*
618 * XDR encode functions
619 */
620/*
621 * There must be an encoding function for void results so svc_process
622 * will work properly.
623 */
624int
Al Viro91f07162006-10-19 23:28:57 -0700625nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626{
627 return xdr_ressize_check(rqstp, p);
628}
629
630/* GETATTR */
631int
Al Viro91f07162006-10-19 23:28:57 -0700632nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 struct nfsd3_attrstat *resp)
634{
Peter Staubach40ee5dc2007-08-16 12:10:07 -0400635 if (resp->status == 0) {
David Howells2b0143b2015-03-17 22:25:59 +0000636 lease_get_mtime(d_inode(resp->fh.fh_dentry),
Peter Staubach40ee5dc2007-08-16 12:10:07 -0400637 &resp->stat.mtime);
David Shawa334de22006-01-06 00:19:58 -0800638 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
Peter Staubach40ee5dc2007-08-16 12:10:07 -0400639 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 return xdr_ressize_check(rqstp, p);
641}
642
643/* SETATTR, REMOVE, RMDIR */
644int
Al Viro91f07162006-10-19 23:28:57 -0700645nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 struct nfsd3_attrstat *resp)
647{
648 p = encode_wcc_data(rqstp, p, &resp->fh);
649 return xdr_ressize_check(rqstp, p);
650}
651
652/* LOOKUP */
653int
Al Viro91f07162006-10-19 23:28:57 -0700654nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 struct nfsd3_diropres *resp)
656{
657 if (resp->status == 0) {
658 p = encode_fh(p, &resp->fh);
659 p = encode_post_op_attr(rqstp, p, &resp->fh);
660 }
661 p = encode_post_op_attr(rqstp, p, &resp->dirfh);
662 return xdr_ressize_check(rqstp, p);
663}
664
665/* ACCESS */
666int
Al Viro91f07162006-10-19 23:28:57 -0700667nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 struct nfsd3_accessres *resp)
669{
670 p = encode_post_op_attr(rqstp, p, &resp->fh);
671 if (resp->status == 0)
672 *p++ = htonl(resp->access);
673 return xdr_ressize_check(rqstp, p);
674}
675
676/* READLINK */
677int
Al Viro91f07162006-10-19 23:28:57 -0700678nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679 struct nfsd3_readlinkres *resp)
680{
681 p = encode_post_op_attr(rqstp, p, &resp->fh);
682 if (resp->status == 0) {
683 *p++ = htonl(resp->len);
684 xdr_ressize_check(rqstp, p);
685 rqstp->rq_res.page_len = resp->len;
686 if (resp->len & 3) {
687 /* need to pad the tail */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 rqstp->rq_res.tail[0].iov_base = p;
689 *p = 0;
690 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
691 }
692 return 1;
693 } else
694 return xdr_ressize_check(rqstp, p);
695}
696
697/* READ */
698int
Al Viro91f07162006-10-19 23:28:57 -0700699nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 struct nfsd3_readres *resp)
701{
702 p = encode_post_op_attr(rqstp, p, &resp->fh);
703 if (resp->status == 0) {
704 *p++ = htonl(resp->count);
705 *p++ = htonl(resp->eof);
706 *p++ = htonl(resp->count); /* xdr opaque count */
707 xdr_ressize_check(rqstp, p);
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300708 /* now update rqstp->rq_res to reflect data as well */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 rqstp->rq_res.page_len = resp->count;
710 if (resp->count & 3) {
711 /* need to pad the tail */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 rqstp->rq_res.tail[0].iov_base = p;
713 *p = 0;
714 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
715 }
716 return 1;
717 } else
718 return xdr_ressize_check(rqstp, p);
719}
720
721/* WRITE */
722int
Al Viro91f07162006-10-19 23:28:57 -0700723nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 struct nfsd3_writeres *resp)
725{
Stanislav Kinsburskyb9c0ef82012-12-06 14:23:19 +0300726 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
727
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 p = encode_wcc_data(rqstp, p, &resp->fh);
729 if (resp->status == 0) {
730 *p++ = htonl(resp->count);
731 *p++ = htonl(resp->committed);
Stanislav Kinsburskyb9c0ef82012-12-06 14:23:19 +0300732 *p++ = htonl(nn->nfssvc_boot.tv_sec);
733 *p++ = htonl(nn->nfssvc_boot.tv_usec);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 }
735 return xdr_ressize_check(rqstp, p);
736}
737
738/* CREATE, MKDIR, SYMLINK, MKNOD */
739int
Al Viro91f07162006-10-19 23:28:57 -0700740nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 struct nfsd3_diropres *resp)
742{
743 if (resp->status == 0) {
744 *p++ = xdr_one;
745 p = encode_fh(p, &resp->fh);
746 p = encode_post_op_attr(rqstp, p, &resp->fh);
747 }
748 p = encode_wcc_data(rqstp, p, &resp->dirfh);
749 return xdr_ressize_check(rqstp, p);
750}
751
752/* RENAME */
753int
Al Viro91f07162006-10-19 23:28:57 -0700754nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 struct nfsd3_renameres *resp)
756{
757 p = encode_wcc_data(rqstp, p, &resp->ffh);
758 p = encode_wcc_data(rqstp, p, &resp->tfh);
759 return xdr_ressize_check(rqstp, p);
760}
761
762/* LINK */
763int
Al Viro91f07162006-10-19 23:28:57 -0700764nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 struct nfsd3_linkres *resp)
766{
767 p = encode_post_op_attr(rqstp, p, &resp->fh);
768 p = encode_wcc_data(rqstp, p, &resp->tfh);
769 return xdr_ressize_check(rqstp, p);
770}
771
772/* READDIR */
773int
Al Viro91f07162006-10-19 23:28:57 -0700774nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 struct nfsd3_readdirres *resp)
776{
777 p = encode_post_op_attr(rqstp, p, &resp->fh);
778
779 if (resp->status == 0) {
780 /* stupid readdir cookie */
781 memcpy(p, resp->verf, 8); p += 2;
782 xdr_ressize_check(rqstp, p);
783 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
784 return 1; /*No room for trailer */
785 rqstp->rq_res.page_len = (resp->count) << 2;
786
787 /* add the 'tail' to the end of the 'head' page - page 0. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788 rqstp->rq_res.tail[0].iov_base = p;
789 *p++ = 0; /* no more entries */
790 *p++ = htonl(resp->common.err == nfserr_eof);
791 rqstp->rq_res.tail[0].iov_len = 2<<2;
792 return 1;
793 } else
794 return xdr_ressize_check(rqstp, p);
795}
796
Adrian Bunk3ee6f612006-12-06 20:40:23 -0800797static __be32 *
Al Viro91f07162006-10-19 23:28:57 -0700798encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
Peter Staubach40ee5dc2007-08-16 12:10:07 -0400799 int namlen, u64 ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800{
801 *p++ = xdr_one; /* mark entry present */
802 p = xdr_encode_hyper(p, ino); /* file id */
803 p = xdr_encode_array(p, name, namlen);/* name length & name */
804
805 cd->offset = p; /* remember pointer */
806 p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
807
808 return p;
809}
810
Al Viroefe39652012-04-13 00:32:14 -0400811static __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
NeilBrown43b0e7e2015-05-03 09:16:53 +1000813 const char *name, int namlen, u64 ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814{
815 struct svc_export *exp;
816 struct dentry *dparent, *dchild;
Al Viroefe39652012-04-13 00:32:14 -0400817 __be32 rv = nfserr_noent;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818
819 dparent = cd->fh.fh_dentry;
820 exp = cd->fh.fh_export;
821
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 if (isdotent(name, namlen)) {
823 if (namlen == 2) {
824 dchild = dget_parent(dparent);
Al Viroefe39652012-04-13 00:32:14 -0400825 /* filesystem root - cannot return filehandle for ".." */
826 if (dchild == dparent)
827 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 } else
829 dchild = dget(dparent);
830 } else
NeilBrownbbddca82016-01-07 16:08:20 -0500831 dchild = lookup_one_len_unlocked(name, dparent, namlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 if (IS_ERR(dchild))
Al Viroefe39652012-04-13 00:32:14 -0400833 return rv;
J. Bruce Fields8177e6d2009-09-04 14:13:09 -0400834 if (d_mountpoint(dchild))
835 goto out;
David Howells2b0143b2015-03-17 22:25:59 +0000836 if (d_really_is_negative(dchild))
J. Bruce Fields8177e6d2009-09-04 14:13:09 -0400837 goto out;
NeilBrown43b0e7e2015-05-03 09:16:53 +1000838 if (dchild->d_inode->i_ino != ino)
839 goto out;
Al Viroefe39652012-04-13 00:32:14 -0400840 rv = fh_compose(fhp, exp, dchild, &cd->fh);
J. Bruce Fields8177e6d2009-09-04 14:13:09 -0400841out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 dput(dchild);
843 return rv;
844}
845
NeilBrown43b0e7e2015-05-03 09:16:53 +1000846static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen, u64 ino)
J. Bruce Fields8177e6d2009-09-04 14:13:09 -0400847{
J. Bruce Fields068c34c2014-01-09 16:24:35 -0500848 struct svc_fh *fh = &cd->scratch;
Al Viroefe39652012-04-13 00:32:14 -0400849 __be32 err;
J. Bruce Fields8177e6d2009-09-04 14:13:09 -0400850
J. Bruce Fields068c34c2014-01-09 16:24:35 -0500851 fh_init(fh, NFS3_FHSIZE);
NeilBrown43b0e7e2015-05-03 09:16:53 +1000852 err = compose_entry_fh(cd, fh, name, namlen, ino);
J. Bruce Fields8177e6d2009-09-04 14:13:09 -0400853 if (err) {
854 *p++ = 0;
855 *p++ = 0;
J. Bruce Fieldsaed100f2009-09-04 14:40:36 -0400856 goto out;
J. Bruce Fields8177e6d2009-09-04 14:13:09 -0400857 }
J. Bruce Fields068c34c2014-01-09 16:24:35 -0500858 p = encode_post_op_attr(cd->rqstp, p, fh);
J. Bruce Fields8177e6d2009-09-04 14:13:09 -0400859 *p++ = xdr_one; /* yes, a file handle follows */
J. Bruce Fields068c34c2014-01-09 16:24:35 -0500860 p = encode_fh(p, fh);
J. Bruce Fieldsaed100f2009-09-04 14:40:36 -0400861out:
J. Bruce Fields068c34c2014-01-09 16:24:35 -0500862 fh_put(fh);
J. Bruce Fields8177e6d2009-09-04 14:13:09 -0400863 return p;
864}
865
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866/*
867 * Encode a directory entry. This one works for both normal readdir
868 * and readdirplus.
869 * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
870 * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
871 *
872 * The readdirplus baggage is 1+21 words for post_op_attr, plus the
873 * file handle.
874 */
875
876#define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1)
877#define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
878static int
NeilBrown598b9a52007-03-26 21:32:08 -0800879encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
Peter Staubach40ee5dc2007-08-16 12:10:07 -0400880 loff_t offset, u64 ino, unsigned int d_type, int plus)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881{
882 struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
883 common);
Al Viro91f07162006-10-19 23:28:57 -0700884 __be32 *p = cd->buffer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885 caddr_t curr_page_addr = NULL;
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500886 struct page ** page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 int slen; /* string (name) length */
888 int elen; /* estimated entry length in words */
889 int num_entry_words = 0; /* actual number of words */
890
891 if (cd->offset) {
892 u64 offset64 = offset;
893
894 if (unlikely(cd->offset1)) {
895 /* we ended up with offset on a page boundary */
896 *cd->offset = htonl(offset64 >> 32);
897 *cd->offset1 = htonl(offset64 & 0xffffffff);
898 cd->offset1 = NULL;
899 } else {
NeilBrown598b9a52007-03-26 21:32:08 -0800900 xdr_encode_hyper(cd->offset, offset64);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901 }
902 }
903
904 /*
905 dprintk("encode_entry(%.*s @%ld%s)\n",
906 namlen, name, (long) offset, plus? " plus" : "");
907 */
908
909 /* truncate filename if too long */
Kinglong Mee3c7aa152014-06-10 18:08:19 +0800910 namlen = min(namlen, NFS3_MAXNAMLEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911
912 slen = XDR_QUADLEN(namlen);
913 elen = slen + NFS3_ENTRY_BAGGAGE
914 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
915
916 if (cd->buflen < elen) {
917 cd->common.err = nfserr_toosmall;
918 return -EINVAL;
919 }
920
921 /* determine which page in rq_respages[] we are currently filling */
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500922 for (page = cd->rqstp->rq_respages + 1;
923 page < cd->rqstp->rq_next_page; page++) {
924 curr_page_addr = page_address(*page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925
926 if (((caddr_t)cd->buffer >= curr_page_addr) &&
927 ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE))
928 break;
929 }
930
931 if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
932 /* encode entry in current page */
933
934 p = encode_entry_baggage(cd, p, name, namlen, ino);
935
J. Bruce Fields8177e6d2009-09-04 14:13:09 -0400936 if (plus)
NeilBrown43b0e7e2015-05-03 09:16:53 +1000937 p = encode_entryplus_baggage(cd, p, name, namlen, ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 num_entry_words = p - cd->buffer;
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500939 } else if (*(page+1) != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940 /* temporarily encode entry into next page, then move back to
941 * current and next page in rq_respages[] */
Al Viro91f07162006-10-19 23:28:57 -0700942 __be32 *p1, *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943 int len1, len2;
944
945 /* grab next page for temporary storage of entry */
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500946 p1 = tmp = page_address(*(page+1));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947
948 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
949
J. Bruce Fields8177e6d2009-09-04 14:13:09 -0400950 if (plus)
NeilBrown43b0e7e2015-05-03 09:16:53 +1000951 p1 = encode_entryplus_baggage(cd, p1, name, namlen, ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952
953 /* determine entry word length and lengths to go in pages */
954 num_entry_words = p1 - tmp;
955 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
956 if ((num_entry_words << 2) < len1) {
957 /* the actual number of words in the entry is less
958 * than elen and can still fit in the current page
959 */
960 memmove(p, tmp, num_entry_words << 2);
961 p += num_entry_words;
962
963 /* update offset */
964 cd->offset = cd->buffer + (cd->offset - tmp);
965 } else {
966 unsigned int offset_r = (cd->offset - tmp) << 2;
967
968 /* update pointer to offset location.
969 * This is a 64bit quantity, so we need to
970 * deal with 3 cases:
971 * - entirely in first page
972 * - entirely in second page
973 * - 4 bytes in each page
974 */
975 if (offset_r + 8 <= len1) {
976 cd->offset = p + (cd->offset - tmp);
977 } else if (offset_r >= len1) {
978 cd->offset -= len1 >> 2;
979 } else {
980 /* sitting on the fence */
981 BUG_ON(offset_r != len1 - 4);
982 cd->offset = p + (cd->offset - tmp);
983 cd->offset1 = tmp;
984 }
985
986 len2 = (num_entry_words << 2) - len1;
987
988 /* move from temp page to current and next pages */
989 memmove(p, tmp, len1);
990 memmove(tmp, (caddr_t)tmp+len1, len2);
991
992 p = tmp + (len2 >> 2);
993 }
994 }
995 else {
996 cd->common.err = nfserr_toosmall;
997 return -EINVAL;
998 }
999
1000 cd->buflen -= num_entry_words;
1001 cd->buffer = p;
1002 cd->common.err = nfs_ok;
1003 return 0;
1004
1005}
1006
1007int
NeilBrowna0ad13e2007-01-26 00:57:10 -08001008nfs3svc_encode_entry(void *cd, const char *name,
1009 int namlen, loff_t offset, u64 ino, unsigned int d_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010{
1011 return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
1012}
1013
1014int
NeilBrowna0ad13e2007-01-26 00:57:10 -08001015nfs3svc_encode_entry_plus(void *cd, const char *name,
1016 int namlen, loff_t offset, u64 ino,
1017 unsigned int d_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018{
1019 return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1020}
1021
1022/* FSSTAT */
1023int
Al Viro91f07162006-10-19 23:28:57 -07001024nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 struct nfsd3_fsstatres *resp)
1026{
1027 struct kstatfs *s = &resp->stats;
1028 u64 bs = s->f_bsize;
1029
1030 *p++ = xdr_zero; /* no post_op_attr */
1031
1032 if (resp->status == 0) {
1033 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */
1034 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */
1035 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */
1036 p = xdr_encode_hyper(p, s->f_files); /* total inodes */
1037 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */
1038 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */
1039 *p++ = htonl(resp->invarsec); /* mean unchanged time */
1040 }
1041 return xdr_ressize_check(rqstp, p);
1042}
1043
1044/* FSINFO */
1045int
Al Viro91f07162006-10-19 23:28:57 -07001046nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047 struct nfsd3_fsinfores *resp)
1048{
1049 *p++ = xdr_zero; /* no post_op_attr */
1050
1051 if (resp->status == 0) {
1052 *p++ = htonl(resp->f_rtmax);
1053 *p++ = htonl(resp->f_rtpref);
1054 *p++ = htonl(resp->f_rtmult);
1055 *p++ = htonl(resp->f_wtmax);
1056 *p++ = htonl(resp->f_wtpref);
1057 *p++ = htonl(resp->f_wtmult);
1058 *p++ = htonl(resp->f_dtpref);
1059 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1060 *p++ = xdr_one;
1061 *p++ = xdr_zero;
1062 *p++ = htonl(resp->f_properties);
1063 }
1064
1065 return xdr_ressize_check(rqstp, p);
1066}
1067
1068/* PATHCONF */
1069int
Al Viro91f07162006-10-19 23:28:57 -07001070nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071 struct nfsd3_pathconfres *resp)
1072{
1073 *p++ = xdr_zero; /* no post_op_attr */
1074
1075 if (resp->status == 0) {
1076 *p++ = htonl(resp->p_link_max);
1077 *p++ = htonl(resp->p_name_max);
1078 *p++ = htonl(resp->p_no_trunc);
1079 *p++ = htonl(resp->p_chown_restricted);
1080 *p++ = htonl(resp->p_case_insensitive);
1081 *p++ = htonl(resp->p_case_preserving);
1082 }
1083
1084 return xdr_ressize_check(rqstp, p);
1085}
1086
1087/* COMMIT */
1088int
Al Viro91f07162006-10-19 23:28:57 -07001089nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090 struct nfsd3_commitres *resp)
1091{
Stanislav Kinsburskyb9c0ef82012-12-06 14:23:19 +03001092 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1093
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094 p = encode_wcc_data(rqstp, p, &resp->fh);
1095 /* Write verifier */
1096 if (resp->status == 0) {
Stanislav Kinsburskyb9c0ef82012-12-06 14:23:19 +03001097 *p++ = htonl(nn->nfssvc_boot.tv_sec);
1098 *p++ = htonl(nn->nfssvc_boot.tv_usec);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099 }
1100 return xdr_ressize_check(rqstp, p);
1101}
1102
1103/*
1104 * XDR release functions
1105 */
1106int
Al Viro91f07162006-10-19 23:28:57 -07001107nfs3svc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108 struct nfsd3_attrstat *resp)
1109{
1110 fh_put(&resp->fh);
1111 return 1;
1112}
1113
1114int
Al Viro91f07162006-10-19 23:28:57 -07001115nfs3svc_release_fhandle2(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116 struct nfsd3_fhandle_pair *resp)
1117{
1118 fh_put(&resp->fh1);
1119 fh_put(&resp->fh2);
1120 return 1;
1121}