2 * linux/fs/nfsd/nfsxdr.c
6 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
9 #include <linux/types.h>
10 #include <linux/time.h>
11 #include <linux/nfs.h>
12 #include <linux/vfs.h>
13 #include <linux/sunrpc/xdr.h>
14 #include <linux/sunrpc/svc.h>
15 #include <linux/nfsd/nfsd.h>
16 #include <linux/nfsd/xdr.h>
19 #define NFSDDBG_FACILITY NFSDDBG_XDR
22 * Mapping of S_IF* types to NFS file types
24 static u32 nfs_ftypes[] = {
25 NFNON, NFCHR, NFCHR, NFBAD,
26 NFDIR, NFBAD, NFBLK, NFBAD,
27 NFREG, NFBAD, NFLNK, NFBAD,
28 NFSOCK, NFBAD, NFLNK, NFBAD,
33 * XDR functions for basic NFS types
36 decode_fh(__be32 *p, struct svc_fh *fhp)
38 fh_init(fhp, NFS_FHSIZE);
39 memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE);
40 fhp->fh_handle.fh_size = NFS_FHSIZE;
42 /* FIXME: Look up export pointer here and verify
43 * Sun Secure RPC if requested */
44 return p + (NFS_FHSIZE >> 2);
47 /* Helper function for NFSv2 ACL code */
48 __be32 *nfs2svc_decode_fh(__be32 *p, struct svc_fh *fhp)
50 return decode_fh(p, fhp);
54 encode_fh(__be32 *p, struct svc_fh *fhp)
56 memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE);
57 return p + (NFS_FHSIZE>> 2);
61 * Decode a file name and make sure that the path contains
62 * no slashes or null bytes.
65 decode_filename(__be32 *p, char **namp, int *lenp)
70 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXNAMLEN)) != NULL) {
71 for (i = 0, name = *namp; i < *lenp; i++, name++) {
72 if (*name == '\0' || *name == '/')
81 decode_pathname(__be32 *p, char **namp, int *lenp)
86 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXPATHLEN)) != NULL) {
87 for (i = 0, name = *namp; i < *lenp; i++, name++) {
97 decode_sattr(__be32 *p, struct iattr *iap)
103 /* Sun client bug compatibility check: some sun clients seem to
104 * put 0xffff in the mode field when they mean 0xffffffff.
105 * Quoting the 4.4BSD nfs server code: Nah nah nah nah na nah.
107 if ((tmp = ntohl(*p++)) != (u32)-1 && tmp != 0xffff) {
108 iap->ia_valid |= ATTR_MODE;
111 if ((tmp = ntohl(*p++)) != (u32)-1) {
112 iap->ia_valid |= ATTR_UID;
115 if ((tmp = ntohl(*p++)) != (u32)-1) {
116 iap->ia_valid |= ATTR_GID;
119 if ((tmp = ntohl(*p++)) != (u32)-1) {
120 iap->ia_valid |= ATTR_SIZE;
123 tmp = ntohl(*p++); tmp1 = ntohl(*p++);
124 if (tmp != (u32)-1 && tmp1 != (u32)-1) {
125 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
126 iap->ia_atime.tv_sec = tmp;
127 iap->ia_atime.tv_nsec = tmp1 * 1000;
129 tmp = ntohl(*p++); tmp1 = ntohl(*p++);
130 if (tmp != (u32)-1 && tmp1 != (u32)-1) {
131 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
132 iap->ia_mtime.tv_sec = tmp;
133 iap->ia_mtime.tv_nsec = tmp1 * 1000;
135 * Passing the invalid value useconds=1000000 for mtime
136 * is a Sun convention for "set both mtime and atime to
137 * current server time". It's needed to make permissions
138 * checks for the "touch" program across v2 mounts to
139 * Solaris and Irix boxes work correctly. See description of
140 * sattr in section 6.1 of "NFS Illustrated" by
141 * Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5
144 iap->ia_valid &= ~(ATTR_ATIME_SET|ATTR_MTIME_SET);
150 encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
153 struct dentry *dentry = fhp->fh_dentry;
155 struct timespec time;
158 type = (stat->mode & S_IFMT);
160 *p++ = htonl(nfs_ftypes[type >> 12]);
161 *p++ = htonl((u32) stat->mode);
162 *p++ = htonl((u32) stat->nlink);
163 *p++ = htonl((u32) nfsd_ruid(rqstp, stat->uid));
164 *p++ = htonl((u32) nfsd_rgid(rqstp, stat->gid));
166 if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN) {
167 *p++ = htonl(NFS_MAXPATHLEN);
169 *p++ = htonl((u32) stat->size);
171 *p++ = htonl((u32) stat->blksize);
172 if (S_ISCHR(type) || S_ISBLK(type))
173 *p++ = htonl(new_encode_dev(stat->rdev));
175 *p++ = htonl(0xffffffff);
176 *p++ = htonl((u32) stat->blocks);
177 switch (fsid_source(fhp)) {
180 *p++ = htonl(new_encode_dev(stat->dev));
182 case FSIDSOURCE_FSID:
183 *p++ = htonl((u32) fhp->fh_export->ex_fsid);
185 case FSIDSOURCE_UUID:
186 f = ((u32*)fhp->fh_export->ex_uuid)[0];
187 f ^= ((u32*)fhp->fh_export->ex_uuid)[1];
188 f ^= ((u32*)fhp->fh_export->ex_uuid)[2];
189 f ^= ((u32*)fhp->fh_export->ex_uuid)[3];
193 *p++ = htonl((u32) stat->ino);
194 *p++ = htonl((u32) stat->atime.tv_sec);
195 *p++ = htonl(stat->atime.tv_nsec ? stat->atime.tv_nsec / 1000 : 0);
196 lease_get_mtime(dentry->d_inode, &time);
197 *p++ = htonl((u32) time.tv_sec);
198 *p++ = htonl(time.tv_nsec ? time.tv_nsec / 1000 : 0);
199 *p++ = htonl((u32) stat->ctime.tv_sec);
200 *p++ = htonl(stat->ctime.tv_nsec ? stat->ctime.tv_nsec / 1000 : 0);
205 /* Helper function for NFSv2 ACL code */
206 __be32 *nfs2svc_encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
209 vfs_getattr(fhp->fh_export->ex_mnt, fhp->fh_dentry, &stat);
210 return encode_fattr(rqstp, p, fhp, &stat);
214 * XDR decode functions
217 nfssvc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
219 return xdr_argsize_check(rqstp, p);
223 nfssvc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args)
225 if (!(p = decode_fh(p, &args->fh)))
227 return xdr_argsize_check(rqstp, p);
231 nfssvc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p,
232 struct nfsd_sattrargs *args)
234 if (!(p = decode_fh(p, &args->fh))
235 || !(p = decode_sattr(p, &args->attrs)))
238 return xdr_argsize_check(rqstp, p);
242 nfssvc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p,
243 struct nfsd_diropargs *args)
245 if (!(p = decode_fh(p, &args->fh))
246 || !(p = decode_filename(p, &args->name, &args->len)))
249 return xdr_argsize_check(rqstp, p);
253 nfssvc_decode_readargs(struct svc_rqst *rqstp, __be32 *p,
254 struct nfsd_readargs *args)
258 if (!(p = decode_fh(p, &args->fh)))
261 args->offset = ntohl(*p++);
262 len = args->count = ntohl(*p++);
263 p++; /* totalcount - unused */
265 if (len > NFSSVC_MAXBLKSIZE_V2)
266 len = NFSSVC_MAXBLKSIZE_V2;
268 /* set up somewhere to store response.
269 * We take pages, put them on reslist and include in iovec
273 pn = rqstp->rq_resused++;
274 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_respages[pn]);
275 rqstp->rq_vec[v].iov_len = len < PAGE_SIZE?len:PAGE_SIZE;
276 len -= rqstp->rq_vec[v].iov_len;
280 return xdr_argsize_check(rqstp, p);
284 nfssvc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p,
285 struct nfsd_writeargs *args)
289 if (!(p = decode_fh(p, &args->fh)))
292 p++; /* beginoffset */
293 args->offset = ntohl(*p++); /* offset */
294 p++; /* totalcount */
295 len = args->len = ntohl(*p++);
296 rqstp->rq_vec[0].iov_base = (void*)p;
297 rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len -
298 (((void*)p) - rqstp->rq_arg.head[0].iov_base);
299 if (len > NFSSVC_MAXBLKSIZE_V2)
300 len = NFSSVC_MAXBLKSIZE_V2;
302 while (len > rqstp->rq_vec[v].iov_len) {
303 len -= rqstp->rq_vec[v].iov_len;
305 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
306 rqstp->rq_vec[v].iov_len = PAGE_SIZE;
308 rqstp->rq_vec[v].iov_len = len;
310 return rqstp->rq_vec[0].iov_len > 0;
314 nfssvc_decode_createargs(struct svc_rqst *rqstp, __be32 *p,
315 struct nfsd_createargs *args)
317 if (!(p = decode_fh(p, &args->fh))
318 || !(p = decode_filename(p, &args->name, &args->len))
319 || !(p = decode_sattr(p, &args->attrs)))
322 return xdr_argsize_check(rqstp, p);
326 nfssvc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p,
327 struct nfsd_renameargs *args)
329 if (!(p = decode_fh(p, &args->ffh))
330 || !(p = decode_filename(p, &args->fname, &args->flen))
331 || !(p = decode_fh(p, &args->tfh))
332 || !(p = decode_filename(p, &args->tname, &args->tlen)))
335 return xdr_argsize_check(rqstp, p);
339 nfssvc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd_readlinkargs *args)
341 if (!(p = decode_fh(p, &args->fh)))
343 args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused++]);
345 return xdr_argsize_check(rqstp, p);
349 nfssvc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p,
350 struct nfsd_linkargs *args)
352 if (!(p = decode_fh(p, &args->ffh))
353 || !(p = decode_fh(p, &args->tfh))
354 || !(p = decode_filename(p, &args->tname, &args->tlen)))
357 return xdr_argsize_check(rqstp, p);
361 nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p,
362 struct nfsd_symlinkargs *args)
364 if (!(p = decode_fh(p, &args->ffh))
365 || !(p = decode_filename(p, &args->fname, &args->flen))
366 || !(p = decode_pathname(p, &args->tname, &args->tlen))
367 || !(p = decode_sattr(p, &args->attrs)))
370 return xdr_argsize_check(rqstp, p);
374 nfssvc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
375 struct nfsd_readdirargs *args)
377 if (!(p = decode_fh(p, &args->fh)))
379 args->cookie = ntohl(*p++);
380 args->count = ntohl(*p++);
381 if (args->count > PAGE_SIZE)
382 args->count = PAGE_SIZE;
384 args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused++]);
386 return xdr_argsize_check(rqstp, p);
390 * XDR encode functions
393 nfssvc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
395 return xdr_ressize_check(rqstp, p);
399 nfssvc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
400 struct nfsd_attrstat *resp)
402 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
403 return xdr_ressize_check(rqstp, p);
407 nfssvc_encode_diropres(struct svc_rqst *rqstp, __be32 *p,
408 struct nfsd_diropres *resp)
410 p = encode_fh(p, &resp->fh);
411 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
412 return xdr_ressize_check(rqstp, p);
416 nfssvc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p,
417 struct nfsd_readlinkres *resp)
419 *p++ = htonl(resp->len);
420 xdr_ressize_check(rqstp, p);
421 rqstp->rq_res.page_len = resp->len;
423 /* need to pad the tail */
424 rqstp->rq_res.tail[0].iov_base = p;
426 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
432 nfssvc_encode_readres(struct svc_rqst *rqstp, __be32 *p,
433 struct nfsd_readres *resp)
435 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
436 *p++ = htonl(resp->count);
437 xdr_ressize_check(rqstp, p);
439 /* now update rqstp->rq_res to reflect data aswell */
440 rqstp->rq_res.page_len = resp->count;
441 if (resp->count & 3) {
442 /* need to pad the tail */
443 rqstp->rq_res.tail[0].iov_base = p;
445 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count&3);
451 nfssvc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
452 struct nfsd_readdirres *resp)
454 xdr_ressize_check(rqstp, p);
456 *p++ = 0; /* no more entries */
457 *p++ = htonl((resp->common.err == nfserr_eof));
458 rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1;
464 nfssvc_encode_statfsres(struct svc_rqst *rqstp, __be32 *p,
465 struct nfsd_statfsres *resp)
467 struct kstatfs *stat = &resp->stats;
469 *p++ = htonl(NFSSVC_MAXBLKSIZE_V2); /* max transfer size */
470 *p++ = htonl(stat->f_bsize);
471 *p++ = htonl(stat->f_blocks);
472 *p++ = htonl(stat->f_bfree);
473 *p++ = htonl(stat->f_bavail);
474 return xdr_ressize_check(rqstp, p);
478 nfssvc_encode_entry(void *ccdv, const char *name,
479 int namlen, loff_t offset, u64 ino, unsigned int d_type)
481 struct readdir_cd *ccd = ccdv;
482 struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common);
483 __be32 *p = cd->buffer;
487 dprintk("nfsd: entry(%.*s off %ld ino %ld)\n",
488 namlen, name, offset, ino);
491 if (offset > ~((u32) 0)) {
492 cd->common.err = nfserr_fbig;
496 *cd->offset = htonl(offset);
497 if (namlen > NFS2_MAXNAMLEN)
498 namlen = NFS2_MAXNAMLEN;/* truncate filename */
500 slen = XDR_QUADLEN(namlen);
501 if ((buflen = cd->buflen - slen - 4) < 0) {
502 cd->common.err = nfserr_toosmall;
505 *p++ = xdr_one; /* mark entry present */
506 *p++ = htonl((u32) ino); /* file id */
507 p = xdr_encode_array(p, name, namlen);/* name length & name */
508 cd->offset = p; /* remember pointer */
509 *p++ = htonl(~0U); /* offset of next entry */
513 cd->common.err = nfs_ok;
518 * XDR release functions
521 nfssvc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
522 struct nfsd_fhandle *resp)