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;
157 type = (stat->mode & S_IFMT);
159 *p++ = htonl(nfs_ftypes[type >> 12]);
160 *p++ = htonl((u32) stat->mode);
161 *p++ = htonl((u32) stat->nlink);
162 *p++ = htonl((u32) nfsd_ruid(rqstp, stat->uid));
163 *p++ = htonl((u32) nfsd_rgid(rqstp, stat->gid));
165 if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN) {
166 *p++ = htonl(NFS_MAXPATHLEN);
168 *p++ = htonl((u32) stat->size);
170 *p++ = htonl((u32) stat->blksize);
171 if (S_ISCHR(type) || S_ISBLK(type))
172 *p++ = htonl(new_encode_dev(stat->rdev));
174 *p++ = htonl(0xffffffff);
175 *p++ = htonl((u32) stat->blocks);
176 if (is_fsid(fhp, rqstp->rq_reffh))
177 *p++ = htonl((u32) fhp->fh_export->ex_fsid);
179 *p++ = htonl(new_encode_dev(stat->dev));
180 *p++ = htonl((u32) stat->ino);
181 *p++ = htonl((u32) stat->atime.tv_sec);
182 *p++ = htonl(stat->atime.tv_nsec ? stat->atime.tv_nsec / 1000 : 0);
183 lease_get_mtime(dentry->d_inode, &time);
184 *p++ = htonl((u32) time.tv_sec);
185 *p++ = htonl(time.tv_nsec ? time.tv_nsec / 1000 : 0);
186 *p++ = htonl((u32) stat->ctime.tv_sec);
187 *p++ = htonl(stat->ctime.tv_nsec ? stat->ctime.tv_nsec / 1000 : 0);
192 /* Helper function for NFSv2 ACL code */
193 __be32 *nfs2svc_encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
196 vfs_getattr(fhp->fh_export->ex_mnt, fhp->fh_dentry, &stat);
197 return encode_fattr(rqstp, p, fhp, &stat);
201 * XDR decode functions
204 nfssvc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
206 return xdr_argsize_check(rqstp, p);
210 nfssvc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args)
212 if (!(p = decode_fh(p, &args->fh)))
214 return xdr_argsize_check(rqstp, p);
218 nfssvc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p,
219 struct nfsd_sattrargs *args)
221 if (!(p = decode_fh(p, &args->fh))
222 || !(p = decode_sattr(p, &args->attrs)))
225 return xdr_argsize_check(rqstp, p);
229 nfssvc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p,
230 struct nfsd_diropargs *args)
232 if (!(p = decode_fh(p, &args->fh))
233 || !(p = decode_filename(p, &args->name, &args->len)))
236 return xdr_argsize_check(rqstp, p);
240 nfssvc_decode_readargs(struct svc_rqst *rqstp, __be32 *p,
241 struct nfsd_readargs *args)
245 if (!(p = decode_fh(p, &args->fh)))
248 args->offset = ntohl(*p++);
249 len = args->count = ntohl(*p++);
250 p++; /* totalcount - unused */
252 if (len > NFSSVC_MAXBLKSIZE_V2)
253 len = NFSSVC_MAXBLKSIZE_V2;
255 /* set up somewhere to store response.
256 * We take pages, put them on reslist and include in iovec
260 pn = rqstp->rq_resused++;
261 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_respages[pn]);
262 rqstp->rq_vec[v].iov_len = len < PAGE_SIZE?len:PAGE_SIZE;
263 len -= rqstp->rq_vec[v].iov_len;
267 return xdr_argsize_check(rqstp, p);
271 nfssvc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p,
272 struct nfsd_writeargs *args)
276 if (!(p = decode_fh(p, &args->fh)))
279 p++; /* beginoffset */
280 args->offset = ntohl(*p++); /* offset */
281 p++; /* totalcount */
282 len = args->len = ntohl(*p++);
283 rqstp->rq_vec[0].iov_base = (void*)p;
284 rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len -
285 (((void*)p) - rqstp->rq_arg.head[0].iov_base);
286 if (len > NFSSVC_MAXBLKSIZE_V2)
287 len = NFSSVC_MAXBLKSIZE_V2;
289 while (len > rqstp->rq_vec[v].iov_len) {
290 len -= rqstp->rq_vec[v].iov_len;
292 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
293 rqstp->rq_vec[v].iov_len = PAGE_SIZE;
295 rqstp->rq_vec[v].iov_len = len;
297 return rqstp->rq_vec[0].iov_len > 0;
301 nfssvc_decode_createargs(struct svc_rqst *rqstp, __be32 *p,
302 struct nfsd_createargs *args)
304 if (!(p = decode_fh(p, &args->fh))
305 || !(p = decode_filename(p, &args->name, &args->len))
306 || !(p = decode_sattr(p, &args->attrs)))
309 return xdr_argsize_check(rqstp, p);
313 nfssvc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p,
314 struct nfsd_renameargs *args)
316 if (!(p = decode_fh(p, &args->ffh))
317 || !(p = decode_filename(p, &args->fname, &args->flen))
318 || !(p = decode_fh(p, &args->tfh))
319 || !(p = decode_filename(p, &args->tname, &args->tlen)))
322 return xdr_argsize_check(rqstp, p);
326 nfssvc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd_readlinkargs *args)
328 if (!(p = decode_fh(p, &args->fh)))
330 args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused++]);
332 return xdr_argsize_check(rqstp, p);
336 nfssvc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p,
337 struct nfsd_linkargs *args)
339 if (!(p = decode_fh(p, &args->ffh))
340 || !(p = decode_fh(p, &args->tfh))
341 || !(p = decode_filename(p, &args->tname, &args->tlen)))
344 return xdr_argsize_check(rqstp, p);
348 nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p,
349 struct nfsd_symlinkargs *args)
351 if (!(p = decode_fh(p, &args->ffh))
352 || !(p = decode_filename(p, &args->fname, &args->flen))
353 || !(p = decode_pathname(p, &args->tname, &args->tlen))
354 || !(p = decode_sattr(p, &args->attrs)))
357 return xdr_argsize_check(rqstp, p);
361 nfssvc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
362 struct nfsd_readdirargs *args)
364 if (!(p = decode_fh(p, &args->fh)))
366 args->cookie = ntohl(*p++);
367 args->count = ntohl(*p++);
368 if (args->count > PAGE_SIZE)
369 args->count = PAGE_SIZE;
371 args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused++]);
373 return xdr_argsize_check(rqstp, p);
377 * XDR encode functions
380 nfssvc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
382 return xdr_ressize_check(rqstp, p);
386 nfssvc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
387 struct nfsd_attrstat *resp)
389 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
390 return xdr_ressize_check(rqstp, p);
394 nfssvc_encode_diropres(struct svc_rqst *rqstp, __be32 *p,
395 struct nfsd_diropres *resp)
397 p = encode_fh(p, &resp->fh);
398 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
399 return xdr_ressize_check(rqstp, p);
403 nfssvc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p,
404 struct nfsd_readlinkres *resp)
406 *p++ = htonl(resp->len);
407 xdr_ressize_check(rqstp, p);
408 rqstp->rq_res.page_len = resp->len;
410 /* need to pad the tail */
411 rqstp->rq_res.tail[0].iov_base = p;
413 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
419 nfssvc_encode_readres(struct svc_rqst *rqstp, __be32 *p,
420 struct nfsd_readres *resp)
422 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
423 *p++ = htonl(resp->count);
424 xdr_ressize_check(rqstp, p);
426 /* now update rqstp->rq_res to reflect data aswell */
427 rqstp->rq_res.page_len = resp->count;
428 if (resp->count & 3) {
429 /* need to pad the tail */
430 rqstp->rq_res.tail[0].iov_base = p;
432 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count&3);
438 nfssvc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
439 struct nfsd_readdirres *resp)
441 xdr_ressize_check(rqstp, p);
443 *p++ = 0; /* no more entries */
444 *p++ = htonl((resp->common.err == nfserr_eof));
445 rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1;
451 nfssvc_encode_statfsres(struct svc_rqst *rqstp, __be32 *p,
452 struct nfsd_statfsres *resp)
454 struct kstatfs *stat = &resp->stats;
456 *p++ = htonl(NFSSVC_MAXBLKSIZE_V2); /* max transfer size */
457 *p++ = htonl(stat->f_bsize);
458 *p++ = htonl(stat->f_blocks);
459 *p++ = htonl(stat->f_bfree);
460 *p++ = htonl(stat->f_bavail);
461 return xdr_ressize_check(rqstp, p);
465 nfssvc_encode_entry(struct readdir_cd *ccd, const char *name,
466 int namlen, loff_t offset, ino_t ino, unsigned int d_type)
468 struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common);
469 __be32 *p = cd->buffer;
473 dprintk("nfsd: entry(%.*s off %ld ino %ld)\n",
474 namlen, name, offset, ino);
477 if (offset > ~((u32) 0)) {
478 cd->common.err = nfserr_fbig;
482 *cd->offset = htonl(offset);
483 if (namlen > NFS2_MAXNAMLEN)
484 namlen = NFS2_MAXNAMLEN;/* truncate filename */
486 slen = XDR_QUADLEN(namlen);
487 if ((buflen = cd->buflen - slen - 4) < 0) {
488 cd->common.err = nfserr_toosmall;
491 *p++ = xdr_one; /* mark entry present */
492 *p++ = htonl((u32) ino); /* file id */
493 p = xdr_encode_array(p, name, namlen);/* name length & name */
494 cd->offset = p; /* remember pointer */
495 *p++ = htonl(~0U); /* offset of next entry */
499 cd->common.err = nfs_ok;
504 * XDR release functions
507 nfssvc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
508 struct nfsd_fhandle *resp)