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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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361
Benoit Tained40aa332014-05-22 16:32:30 +0200362 p = decode_fh(p, &args->fh);
363 if (!p)
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
Chuck Lever6625d092016-05-04 10:52:55 -0400382 + rqstp->rq_arg.tail[0].iov_len - 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) {
Kinglong Mee3c7aa152014-06-10 18:08:19 +0800482 avail = min_t(unsigned int, rqstp->rq_arg.page_len, PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 old = page_address(rqstp->rq_arg.pages[0]);
484 }
485 while (len && avail && *old) {
486 *new++ = *old++;
487 len--;
488 avail--;
489 }
490 *new = '\0';
491 if (len)
492 return 0;
493
494 return 1;
495}
496
497int
Al Viro91f07162006-10-19 23:28:57 -0700498nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 struct nfsd3_mknodargs *args)
500{
501 if (!(p = decode_fh(p, &args->fh))
502 || !(p = decode_filename(p, &args->name, &args->len)))
503 return 0;
504
505 args->ftype = ntohl(*p++);
506
507 if (args->ftype == NF3BLK || args->ftype == NF3CHR
NeilBrown072f62e2007-05-09 02:34:57 -0700508 || args->ftype == NF3SOCK || args->ftype == NF3FIFO)
509 p = decode_sattr3(p, &args->attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510
511 if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
512 args->major = ntohl(*p++);
513 args->minor = ntohl(*p++);
514 }
515
516 return xdr_argsize_check(rqstp, p);
517}
518
519int
Al Viro91f07162006-10-19 23:28:57 -0700520nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 struct nfsd3_renameargs *args)
522{
523 if (!(p = decode_fh(p, &args->ffh))
524 || !(p = decode_filename(p, &args->fname, &args->flen))
525 || !(p = decode_fh(p, &args->tfh))
526 || !(p = decode_filename(p, &args->tname, &args->tlen)))
527 return 0;
528
529 return xdr_argsize_check(rqstp, p);
530}
531
532int
Al Viro91f07162006-10-19 23:28:57 -0700533nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 struct nfsd3_readlinkargs *args)
535{
Benoit Tained40aa332014-05-22 16:32:30 +0200536 p = decode_fh(p, &args->fh);
537 if (!p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 return 0;
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500539 args->buffer = page_address(*(rqstp->rq_next_page++));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540
541 return xdr_argsize_check(rqstp, p);
542}
543
544int
Al Viro91f07162006-10-19 23:28:57 -0700545nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 struct nfsd3_linkargs *args)
547{
548 if (!(p = decode_fh(p, &args->ffh))
549 || !(p = decode_fh(p, &args->tfh))
550 || !(p = decode_filename(p, &args->tname, &args->tlen)))
551 return 0;
552
553 return xdr_argsize_check(rqstp, p);
554}
555
556int
Al Viro91f07162006-10-19 23:28:57 -0700557nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 struct nfsd3_readdirargs *args)
559{
Benoit Tained40aa332014-05-22 16:32:30 +0200560 p = decode_fh(p, &args->fh);
561 if (!p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 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++);
Kinglong Mee3c7aa152014-06-10 18:08:19 +0800567 args->count = min_t(u32, args->count, PAGE_SIZE);
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500568 args->buffer = page_address(*(rqstp->rq_next_page++));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569
570 return xdr_argsize_check(rqstp, p);
571}
572
573int
Al Viro91f07162006-10-19 23:28:57 -0700574nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 struct nfsd3_readdirargs *args)
576{
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500577 int len;
Greg Banks7adae482006-10-04 02:15:47 -0700578 u32 max_blocksize = svc_max_payload(rqstp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579
Benoit Tained40aa332014-05-22 16:32:30 +0200580 p = decode_fh(p, &args->fh);
581 if (!p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 return 0;
583 p = xdr_decode_hyper(p, &args->cookie);
584 args->verf = p; p += 2;
585 args->dircount = ntohl(*p++);
586 args->count = ntohl(*p++);
587
Kinglong Mee3c7aa152014-06-10 18:08:19 +0800588 len = args->count = min(args->count, max_blocksize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 while (len > 0) {
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500590 struct page *p = *(rqstp->rq_next_page++);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 if (!args->buffer)
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500592 args->buffer = page_address(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593 len -= PAGE_SIZE;
594 }
595
596 return xdr_argsize_check(rqstp, p);
597}
598
599int
Al Viro91f07162006-10-19 23:28:57 -0700600nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 struct nfsd3_commitargs *args)
602{
Benoit Tained40aa332014-05-22 16:32:30 +0200603 p = decode_fh(p, &args->fh);
604 if (!p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 return 0;
606 p = xdr_decode_hyper(p, &args->offset);
607 args->count = ntohl(*p++);
608
609 return xdr_argsize_check(rqstp, p);
610}
611
612/*
613 * XDR encode functions
614 */
615/*
616 * There must be an encoding function for void results so svc_process
617 * will work properly.
618 */
619int
Al Viro91f07162006-10-19 23:28:57 -0700620nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621{
622 return xdr_ressize_check(rqstp, p);
623}
624
625/* GETATTR */
626int
Al Viro91f07162006-10-19 23:28:57 -0700627nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 struct nfsd3_attrstat *resp)
629{
Peter Staubach40ee5dc2007-08-16 12:10:07 -0400630 if (resp->status == 0) {
David Howells2b0143b2015-03-17 22:25:59 +0000631 lease_get_mtime(d_inode(resp->fh.fh_dentry),
Peter Staubach40ee5dc2007-08-16 12:10:07 -0400632 &resp->stat.mtime);
David Shawa334de22006-01-06 00:19:58 -0800633 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
Peter Staubach40ee5dc2007-08-16 12:10:07 -0400634 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 return xdr_ressize_check(rqstp, p);
636}
637
638/* SETATTR, REMOVE, RMDIR */
639int
Al Viro91f07162006-10-19 23:28:57 -0700640nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 struct nfsd3_attrstat *resp)
642{
643 p = encode_wcc_data(rqstp, p, &resp->fh);
644 return xdr_ressize_check(rqstp, p);
645}
646
647/* LOOKUP */
648int
Al Viro91f07162006-10-19 23:28:57 -0700649nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 struct nfsd3_diropres *resp)
651{
652 if (resp->status == 0) {
653 p = encode_fh(p, &resp->fh);
654 p = encode_post_op_attr(rqstp, p, &resp->fh);
655 }
656 p = encode_post_op_attr(rqstp, p, &resp->dirfh);
657 return xdr_ressize_check(rqstp, p);
658}
659
660/* ACCESS */
661int
Al Viro91f07162006-10-19 23:28:57 -0700662nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 struct nfsd3_accessres *resp)
664{
665 p = encode_post_op_attr(rqstp, p, &resp->fh);
666 if (resp->status == 0)
667 *p++ = htonl(resp->access);
668 return xdr_ressize_check(rqstp, p);
669}
670
671/* READLINK */
672int
Al Viro91f07162006-10-19 23:28:57 -0700673nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 struct nfsd3_readlinkres *resp)
675{
676 p = encode_post_op_attr(rqstp, p, &resp->fh);
677 if (resp->status == 0) {
678 *p++ = htonl(resp->len);
679 xdr_ressize_check(rqstp, p);
680 rqstp->rq_res.page_len = resp->len;
681 if (resp->len & 3) {
682 /* need to pad the tail */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683 rqstp->rq_res.tail[0].iov_base = p;
684 *p = 0;
685 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
686 }
687 return 1;
688 } else
689 return xdr_ressize_check(rqstp, p);
690}
691
692/* READ */
693int
Al Viro91f07162006-10-19 23:28:57 -0700694nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 struct nfsd3_readres *resp)
696{
697 p = encode_post_op_attr(rqstp, p, &resp->fh);
698 if (resp->status == 0) {
699 *p++ = htonl(resp->count);
700 *p++ = htonl(resp->eof);
701 *p++ = htonl(resp->count); /* xdr opaque count */
702 xdr_ressize_check(rqstp, p);
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300703 /* now update rqstp->rq_res to reflect data as well */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 rqstp->rq_res.page_len = resp->count;
705 if (resp->count & 3) {
706 /* need to pad the tail */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 rqstp->rq_res.tail[0].iov_base = p;
708 *p = 0;
709 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
710 }
711 return 1;
712 } else
713 return xdr_ressize_check(rqstp, p);
714}
715
716/* WRITE */
717int
Al Viro91f07162006-10-19 23:28:57 -0700718nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 struct nfsd3_writeres *resp)
720{
Stanislav Kinsburskyb9c0ef82012-12-06 14:23:19 +0300721 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
722
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 p = encode_wcc_data(rqstp, p, &resp->fh);
724 if (resp->status == 0) {
725 *p++ = htonl(resp->count);
726 *p++ = htonl(resp->committed);
Stanislav Kinsburskyb9c0ef82012-12-06 14:23:19 +0300727 *p++ = htonl(nn->nfssvc_boot.tv_sec);
728 *p++ = htonl(nn->nfssvc_boot.tv_usec);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 }
730 return xdr_ressize_check(rqstp, p);
731}
732
733/* CREATE, MKDIR, SYMLINK, MKNOD */
734int
Al Viro91f07162006-10-19 23:28:57 -0700735nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 struct nfsd3_diropres *resp)
737{
738 if (resp->status == 0) {
739 *p++ = xdr_one;
740 p = encode_fh(p, &resp->fh);
741 p = encode_post_op_attr(rqstp, p, &resp->fh);
742 }
743 p = encode_wcc_data(rqstp, p, &resp->dirfh);
744 return xdr_ressize_check(rqstp, p);
745}
746
747/* RENAME */
748int
Al Viro91f07162006-10-19 23:28:57 -0700749nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 struct nfsd3_renameres *resp)
751{
752 p = encode_wcc_data(rqstp, p, &resp->ffh);
753 p = encode_wcc_data(rqstp, p, &resp->tfh);
754 return xdr_ressize_check(rqstp, p);
755}
756
757/* LINK */
758int
Al Viro91f07162006-10-19 23:28:57 -0700759nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 struct nfsd3_linkres *resp)
761{
762 p = encode_post_op_attr(rqstp, p, &resp->fh);
763 p = encode_wcc_data(rqstp, p, &resp->tfh);
764 return xdr_ressize_check(rqstp, p);
765}
766
767/* READDIR */
768int
Al Viro91f07162006-10-19 23:28:57 -0700769nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770 struct nfsd3_readdirres *resp)
771{
772 p = encode_post_op_attr(rqstp, p, &resp->fh);
773
774 if (resp->status == 0) {
775 /* stupid readdir cookie */
776 memcpy(p, resp->verf, 8); p += 2;
777 xdr_ressize_check(rqstp, p);
778 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
779 return 1; /*No room for trailer */
780 rqstp->rq_res.page_len = (resp->count) << 2;
781
782 /* add the 'tail' to the end of the 'head' page - page 0. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 rqstp->rq_res.tail[0].iov_base = p;
784 *p++ = 0; /* no more entries */
785 *p++ = htonl(resp->common.err == nfserr_eof);
786 rqstp->rq_res.tail[0].iov_len = 2<<2;
787 return 1;
788 } else
789 return xdr_ressize_check(rqstp, p);
790}
791
Adrian Bunk3ee6f612006-12-06 20:40:23 -0800792static __be32 *
Al Viro91f07162006-10-19 23:28:57 -0700793encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
Peter Staubach40ee5dc2007-08-16 12:10:07 -0400794 int namlen, u64 ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795{
796 *p++ = xdr_one; /* mark entry present */
797 p = xdr_encode_hyper(p, ino); /* file id */
798 p = xdr_encode_array(p, name, namlen);/* name length & name */
799
800 cd->offset = p; /* remember pointer */
801 p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
802
803 return p;
804}
805
Al Viroefe39652012-04-13 00:32:14 -0400806static __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
NeilBrown43b0e7e2015-05-03 09:16:53 +1000808 const char *name, int namlen, u64 ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809{
810 struct svc_export *exp;
811 struct dentry *dparent, *dchild;
Al Viroefe39652012-04-13 00:32:14 -0400812 __be32 rv = nfserr_noent;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813
814 dparent = cd->fh.fh_dentry;
815 exp = cd->fh.fh_export;
816
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 if (isdotent(name, namlen)) {
818 if (namlen == 2) {
819 dchild = dget_parent(dparent);
Al Viroefe39652012-04-13 00:32:14 -0400820 /* filesystem root - cannot return filehandle for ".." */
821 if (dchild == dparent)
822 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823 } else
824 dchild = dget(dparent);
825 } else
NeilBrownbbddca82016-01-07 16:08:20 -0500826 dchild = lookup_one_len_unlocked(name, dparent, namlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 if (IS_ERR(dchild))
Al Viroefe39652012-04-13 00:32:14 -0400828 return rv;
J. Bruce Fields8177e6d2009-09-04 14:13:09 -0400829 if (d_mountpoint(dchild))
830 goto out;
David Howells2b0143b2015-03-17 22:25:59 +0000831 if (d_really_is_negative(dchild))
J. Bruce Fields8177e6d2009-09-04 14:13:09 -0400832 goto out;
NeilBrown43b0e7e2015-05-03 09:16:53 +1000833 if (dchild->d_inode->i_ino != ino)
834 goto out;
Al Viroefe39652012-04-13 00:32:14 -0400835 rv = fh_compose(fhp, exp, dchild, &cd->fh);
J. Bruce Fields8177e6d2009-09-04 14:13:09 -0400836out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837 dput(dchild);
838 return rv;
839}
840
NeilBrown43b0e7e2015-05-03 09:16:53 +1000841static __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 -0400842{
J. Bruce Fields068c34c2014-01-09 16:24:35 -0500843 struct svc_fh *fh = &cd->scratch;
Al Viroefe39652012-04-13 00:32:14 -0400844 __be32 err;
J. Bruce Fields8177e6d2009-09-04 14:13:09 -0400845
J. Bruce Fields068c34c2014-01-09 16:24:35 -0500846 fh_init(fh, NFS3_FHSIZE);
NeilBrown43b0e7e2015-05-03 09:16:53 +1000847 err = compose_entry_fh(cd, fh, name, namlen, ino);
J. Bruce Fields8177e6d2009-09-04 14:13:09 -0400848 if (err) {
849 *p++ = 0;
850 *p++ = 0;
J. Bruce Fieldsaed100f2009-09-04 14:40:36 -0400851 goto out;
J. Bruce Fields8177e6d2009-09-04 14:13:09 -0400852 }
J. Bruce Fields068c34c2014-01-09 16:24:35 -0500853 p = encode_post_op_attr(cd->rqstp, p, fh);
J. Bruce Fields8177e6d2009-09-04 14:13:09 -0400854 *p++ = xdr_one; /* yes, a file handle follows */
J. Bruce Fields068c34c2014-01-09 16:24:35 -0500855 p = encode_fh(p, fh);
J. Bruce Fieldsaed100f2009-09-04 14:40:36 -0400856out:
J. Bruce Fields068c34c2014-01-09 16:24:35 -0500857 fh_put(fh);
J. Bruce Fields8177e6d2009-09-04 14:13:09 -0400858 return p;
859}
860
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861/*
862 * Encode a directory entry. This one works for both normal readdir
863 * and readdirplus.
864 * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
865 * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
866 *
867 * The readdirplus baggage is 1+21 words for post_op_attr, plus the
868 * file handle.
869 */
870
871#define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1)
872#define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
873static int
NeilBrown598b9a52007-03-26 21:32:08 -0800874encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
Peter Staubach40ee5dc2007-08-16 12:10:07 -0400875 loff_t offset, u64 ino, unsigned int d_type, int plus)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876{
877 struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
878 common);
Al Viro91f07162006-10-19 23:28:57 -0700879 __be32 *p = cd->buffer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880 caddr_t curr_page_addr = NULL;
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500881 struct page ** page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882 int slen; /* string (name) length */
883 int elen; /* estimated entry length in words */
884 int num_entry_words = 0; /* actual number of words */
885
886 if (cd->offset) {
887 u64 offset64 = offset;
888
889 if (unlikely(cd->offset1)) {
890 /* we ended up with offset on a page boundary */
891 *cd->offset = htonl(offset64 >> 32);
892 *cd->offset1 = htonl(offset64 & 0xffffffff);
893 cd->offset1 = NULL;
894 } else {
NeilBrown598b9a52007-03-26 21:32:08 -0800895 xdr_encode_hyper(cd->offset, offset64);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 }
897 }
898
899 /*
900 dprintk("encode_entry(%.*s @%ld%s)\n",
901 namlen, name, (long) offset, plus? " plus" : "");
902 */
903
904 /* truncate filename if too long */
Kinglong Mee3c7aa152014-06-10 18:08:19 +0800905 namlen = min(namlen, NFS3_MAXNAMLEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906
907 slen = XDR_QUADLEN(namlen);
908 elen = slen + NFS3_ENTRY_BAGGAGE
909 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
910
911 if (cd->buflen < elen) {
912 cd->common.err = nfserr_toosmall;
913 return -EINVAL;
914 }
915
916 /* determine which page in rq_respages[] we are currently filling */
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500917 for (page = cd->rqstp->rq_respages + 1;
918 page < cd->rqstp->rq_next_page; page++) {
919 curr_page_addr = page_address(*page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920
921 if (((caddr_t)cd->buffer >= curr_page_addr) &&
922 ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE))
923 break;
924 }
925
926 if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
927 /* encode entry in current page */
928
929 p = encode_entry_baggage(cd, p, name, namlen, ino);
930
J. Bruce Fields8177e6d2009-09-04 14:13:09 -0400931 if (plus)
NeilBrown43b0e7e2015-05-03 09:16:53 +1000932 p = encode_entryplus_baggage(cd, p, name, namlen, ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933 num_entry_words = p - cd->buffer;
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500934 } else if (*(page+1) != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 /* temporarily encode entry into next page, then move back to
936 * current and next page in rq_respages[] */
Al Viro91f07162006-10-19 23:28:57 -0700937 __be32 *p1, *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 int len1, len2;
939
940 /* grab next page for temporary storage of entry */
J. Bruce Fieldsafc59402012-12-10 18:01:37 -0500941 p1 = tmp = page_address(*(page+1));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942
943 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
944
J. Bruce Fields8177e6d2009-09-04 14:13:09 -0400945 if (plus)
NeilBrown43b0e7e2015-05-03 09:16:53 +1000946 p1 = encode_entryplus_baggage(cd, p1, name, namlen, ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947
948 /* determine entry word length and lengths to go in pages */
949 num_entry_words = p1 - tmp;
950 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
951 if ((num_entry_words << 2) < len1) {
952 /* the actual number of words in the entry is less
953 * than elen and can still fit in the current page
954 */
955 memmove(p, tmp, num_entry_words << 2);
956 p += num_entry_words;
957
958 /* update offset */
959 cd->offset = cd->buffer + (cd->offset - tmp);
960 } else {
961 unsigned int offset_r = (cd->offset - tmp) << 2;
962
963 /* update pointer to offset location.
964 * This is a 64bit quantity, so we need to
965 * deal with 3 cases:
966 * - entirely in first page
967 * - entirely in second page
968 * - 4 bytes in each page
969 */
970 if (offset_r + 8 <= len1) {
971 cd->offset = p + (cd->offset - tmp);
972 } else if (offset_r >= len1) {
973 cd->offset -= len1 >> 2;
974 } else {
975 /* sitting on the fence */
976 BUG_ON(offset_r != len1 - 4);
977 cd->offset = p + (cd->offset - tmp);
978 cd->offset1 = tmp;
979 }
980
981 len2 = (num_entry_words << 2) - len1;
982
983 /* move from temp page to current and next pages */
984 memmove(p, tmp, len1);
985 memmove(tmp, (caddr_t)tmp+len1, len2);
986
987 p = tmp + (len2 >> 2);
988 }
989 }
990 else {
991 cd->common.err = nfserr_toosmall;
992 return -EINVAL;
993 }
994
995 cd->buflen -= num_entry_words;
996 cd->buffer = p;
997 cd->common.err = nfs_ok;
998 return 0;
999
1000}
1001
1002int
NeilBrowna0ad13e2007-01-26 00:57:10 -08001003nfs3svc_encode_entry(void *cd, const char *name,
1004 int namlen, loff_t offset, u64 ino, unsigned int d_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005{
1006 return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
1007}
1008
1009int
NeilBrowna0ad13e2007-01-26 00:57:10 -08001010nfs3svc_encode_entry_plus(void *cd, const char *name,
1011 int namlen, loff_t offset, u64 ino,
1012 unsigned int d_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013{
1014 return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1015}
1016
1017/* FSSTAT */
1018int
Al Viro91f07162006-10-19 23:28:57 -07001019nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 struct nfsd3_fsstatres *resp)
1021{
1022 struct kstatfs *s = &resp->stats;
1023 u64 bs = s->f_bsize;
1024
1025 *p++ = xdr_zero; /* no post_op_attr */
1026
1027 if (resp->status == 0) {
1028 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */
1029 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */
1030 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */
1031 p = xdr_encode_hyper(p, s->f_files); /* total inodes */
1032 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */
1033 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */
1034 *p++ = htonl(resp->invarsec); /* mean unchanged time */
1035 }
1036 return xdr_ressize_check(rqstp, p);
1037}
1038
1039/* FSINFO */
1040int
Al Viro91f07162006-10-19 23:28:57 -07001041nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 struct nfsd3_fsinfores *resp)
1043{
1044 *p++ = xdr_zero; /* no post_op_attr */
1045
1046 if (resp->status == 0) {
1047 *p++ = htonl(resp->f_rtmax);
1048 *p++ = htonl(resp->f_rtpref);
1049 *p++ = htonl(resp->f_rtmult);
1050 *p++ = htonl(resp->f_wtmax);
1051 *p++ = htonl(resp->f_wtpref);
1052 *p++ = htonl(resp->f_wtmult);
1053 *p++ = htonl(resp->f_dtpref);
1054 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1055 *p++ = xdr_one;
1056 *p++ = xdr_zero;
1057 *p++ = htonl(resp->f_properties);
1058 }
1059
1060 return xdr_ressize_check(rqstp, p);
1061}
1062
1063/* PATHCONF */
1064int
Al Viro91f07162006-10-19 23:28:57 -07001065nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 struct nfsd3_pathconfres *resp)
1067{
1068 *p++ = xdr_zero; /* no post_op_attr */
1069
1070 if (resp->status == 0) {
1071 *p++ = htonl(resp->p_link_max);
1072 *p++ = htonl(resp->p_name_max);
1073 *p++ = htonl(resp->p_no_trunc);
1074 *p++ = htonl(resp->p_chown_restricted);
1075 *p++ = htonl(resp->p_case_insensitive);
1076 *p++ = htonl(resp->p_case_preserving);
1077 }
1078
1079 return xdr_ressize_check(rqstp, p);
1080}
1081
1082/* COMMIT */
1083int
Al Viro91f07162006-10-19 23:28:57 -07001084nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 struct nfsd3_commitres *resp)
1086{
Stanislav Kinsburskyb9c0ef82012-12-06 14:23:19 +03001087 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1088
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089 p = encode_wcc_data(rqstp, p, &resp->fh);
1090 /* Write verifier */
1091 if (resp->status == 0) {
Stanislav Kinsburskyb9c0ef82012-12-06 14:23:19 +03001092 *p++ = htonl(nn->nfssvc_boot.tv_sec);
1093 *p++ = htonl(nn->nfssvc_boot.tv_usec);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094 }
1095 return xdr_ressize_check(rqstp, p);
1096}
1097
1098/*
1099 * XDR release functions
1100 */
1101int
Al Viro91f07162006-10-19 23:28:57 -07001102nfs3svc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103 struct nfsd3_attrstat *resp)
1104{
1105 fh_put(&resp->fh);
1106 return 1;
1107}
1108
1109int
Al Viro91f07162006-10-19 23:28:57 -07001110nfs3svc_release_fhandle2(struct svc_rqst *rqstp, __be32 *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111 struct nfsd3_fhandle_pair *resp)
1112{
1113 fh_put(&resp->fh1);
1114 fh_put(&resp->fh2);
1115 return 1;
1116}