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>
20 #define NFSDDBG_FACILITY NFSDDBG_XDR
23 * Mapping of S_IF* types to NFS file types
25 static u32 nfs_ftypes[] = {
26 NFNON, NFCHR, NFCHR, NFBAD,
27 NFDIR, NFBAD, NFBLK, NFBAD,
28 NFREG, NFBAD, NFLNK, NFBAD,
29 NFSOCK, NFBAD, NFLNK, NFBAD,
34 * XDR functions for basic NFS types
37 decode_fh(__be32 *p, struct svc_fh *fhp)
39 fh_init(fhp, NFS_FHSIZE);
40 memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE);
41 fhp->fh_handle.fh_size = NFS_FHSIZE;
43 /* FIXME: Look up export pointer here and verify
44 * Sun Secure RPC if requested */
45 return p + (NFS_FHSIZE >> 2);
48 /* Helper function for NFSv2 ACL code */
49 __be32 *nfs2svc_decode_fh(__be32 *p, struct svc_fh *fhp)
51 return decode_fh(p, fhp);
55 encode_fh(__be32 *p, struct svc_fh *fhp)
57 memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE);
58 return p + (NFS_FHSIZE>> 2);
62 * Decode a file name and make sure that the path contains
63 * no slashes or null bytes.
66 decode_filename(__be32 *p, char **namp, unsigned int *lenp)
71 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXNAMLEN)) != NULL) {
72 for (i = 0, name = *namp; i < *lenp; i++, name++) {
73 if (*name == '\0' || *name == '/')
82 decode_pathname(__be32 *p, char **namp, unsigned int *lenp)
87 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXPATHLEN)) != NULL) {
88 for (i = 0, name = *namp; i < *lenp; i++, name++) {
98 decode_sattr(__be32 *p, struct iattr *iap)
104 /* Sun client bug compatibility check: some sun clients seem to
105 * put 0xffff in the mode field when they mean 0xffffffff.
106 * Quoting the 4.4BSD nfs server code: Nah nah nah nah na nah.
108 if ((tmp = ntohl(*p++)) != (u32)-1 && tmp != 0xffff) {
109 iap->ia_valid |= ATTR_MODE;
112 if ((tmp = ntohl(*p++)) != (u32)-1) {
113 iap->ia_valid |= ATTR_UID;
116 if ((tmp = ntohl(*p++)) != (u32)-1) {
117 iap->ia_valid |= ATTR_GID;
120 if ((tmp = ntohl(*p++)) != (u32)-1) {
121 iap->ia_valid |= ATTR_SIZE;
124 tmp = ntohl(*p++); tmp1 = ntohl(*p++);
125 if (tmp != (u32)-1 && tmp1 != (u32)-1) {
126 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
127 iap->ia_atime.tv_sec = tmp;
128 iap->ia_atime.tv_nsec = tmp1 * 1000;
130 tmp = ntohl(*p++); tmp1 = ntohl(*p++);
131 if (tmp != (u32)-1 && tmp1 != (u32)-1) {
132 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
133 iap->ia_mtime.tv_sec = tmp;
134 iap->ia_mtime.tv_nsec = tmp1 * 1000;
136 * Passing the invalid value useconds=1000000 for mtime
137 * is a Sun convention for "set both mtime and atime to
138 * current server time". It's needed to make permissions
139 * checks for the "touch" program across v2 mounts to
140 * Solaris and Irix boxes work correctly. See description of
141 * sattr in section 6.1 of "NFS Illustrated" by
142 * Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5
145 iap->ia_valid &= ~(ATTR_ATIME_SET|ATTR_MTIME_SET);
151 encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
154 struct dentry *dentry = fhp->fh_dentry;
156 struct timespec time;
159 type = (stat->mode & S_IFMT);
161 *p++ = htonl(nfs_ftypes[type >> 12]);
162 *p++ = htonl((u32) stat->mode);
163 *p++ = htonl((u32) stat->nlink);
164 *p++ = htonl((u32) nfsd_ruid(rqstp, stat->uid));
165 *p++ = htonl((u32) nfsd_rgid(rqstp, stat->gid));
167 if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN) {
168 *p++ = htonl(NFS_MAXPATHLEN);
170 *p++ = htonl((u32) stat->size);
172 *p++ = htonl((u32) stat->blksize);
173 if (S_ISCHR(type) || S_ISBLK(type))
174 *p++ = htonl(new_encode_dev(stat->rdev));
176 *p++ = htonl(0xffffffff);
177 *p++ = htonl((u32) stat->blocks);
178 switch (fsid_source(fhp)) {
181 *p++ = htonl(new_encode_dev(stat->dev));
183 case FSIDSOURCE_FSID:
184 *p++ = htonl((u32) fhp->fh_export->ex_fsid);
186 case FSIDSOURCE_UUID:
187 f = ((u32*)fhp->fh_export->ex_uuid)[0];
188 f ^= ((u32*)fhp->fh_export->ex_uuid)[1];
189 f ^= ((u32*)fhp->fh_export->ex_uuid)[2];
190 f ^= ((u32*)fhp->fh_export->ex_uuid)[3];
194 *p++ = htonl((u32) stat->ino);
195 *p++ = htonl((u32) stat->atime.tv_sec);
196 *p++ = htonl(stat->atime.tv_nsec ? stat->atime.tv_nsec / 1000 : 0);
197 lease_get_mtime(dentry->d_inode, &time);
198 *p++ = htonl((u32) time.tv_sec);
199 *p++ = htonl(time.tv_nsec ? time.tv_nsec / 1000 : 0);
200 *p++ = htonl((u32) stat->ctime.tv_sec);
201 *p++ = htonl(stat->ctime.tv_nsec ? stat->ctime.tv_nsec / 1000 : 0);
206 /* Helper function for NFSv2 ACL code */
207 __be32 *nfs2svc_encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
210 vfs_getattr(fhp->fh_export->ex_path.mnt, fhp->fh_dentry, &stat);
211 return encode_fattr(rqstp, p, fhp, &stat);
215 * XDR decode functions
218 nfssvc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
220 return xdr_argsize_check(rqstp, p);
224 nfssvc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args)
226 if (!(p = decode_fh(p, &args->fh)))
228 return xdr_argsize_check(rqstp, p);
232 nfssvc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p,
233 struct nfsd_sattrargs *args)
235 p = decode_fh(p, &args->fh);
238 p = decode_sattr(p, &args->attrs);
240 return xdr_argsize_check(rqstp, p);
244 nfssvc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p,
245 struct nfsd_diropargs *args)
247 if (!(p = decode_fh(p, &args->fh))
248 || !(p = decode_filename(p, &args->name, &args->len)))
251 return xdr_argsize_check(rqstp, p);
255 nfssvc_decode_readargs(struct svc_rqst *rqstp, __be32 *p,
256 struct nfsd_readargs *args)
260 if (!(p = decode_fh(p, &args->fh)))
263 args->offset = ntohl(*p++);
264 len = args->count = ntohl(*p++);
265 p++; /* totalcount - unused */
267 if (len > NFSSVC_MAXBLKSIZE_V2)
268 len = NFSSVC_MAXBLKSIZE_V2;
270 /* set up somewhere to store response.
271 * We take pages, put them on reslist and include in iovec
275 pn = rqstp->rq_resused++;
276 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_respages[pn]);
277 rqstp->rq_vec[v].iov_len = len < PAGE_SIZE?len:PAGE_SIZE;
278 len -= rqstp->rq_vec[v].iov_len;
282 return xdr_argsize_check(rqstp, p);
286 nfssvc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p,
287 struct nfsd_writeargs *args)
289 unsigned int len, hdr, dlen;
292 if (!(p = decode_fh(p, &args->fh)))
295 p++; /* beginoffset */
296 args->offset = ntohl(*p++); /* offset */
297 p++; /* totalcount */
298 len = args->len = ntohl(*p++);
300 * The protocol specifies a maximum of 8192 bytes.
302 if (len > NFSSVC_MAXBLKSIZE_V2)
306 * Check to make sure that we got the right number of
309 hdr = (void*)p - rqstp->rq_arg.head[0].iov_base;
310 dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len
314 * Round the length of the data which was specified up to
315 * the next multiple of XDR units and then compare that
316 * against the length which was actually received.
317 * Note that when RPCSEC/GSS (for example) is used, the
318 * data buffer can be padded so dlen might be larger
319 * than required. It must never be smaller.
321 if (dlen < XDR_QUADLEN(len)*4)
324 rqstp->rq_vec[0].iov_base = (void*)p;
325 rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
327 while (len > rqstp->rq_vec[v].iov_len) {
328 len -= rqstp->rq_vec[v].iov_len;
330 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
331 rqstp->rq_vec[v].iov_len = PAGE_SIZE;
333 rqstp->rq_vec[v].iov_len = len;
339 nfssvc_decode_createargs(struct svc_rqst *rqstp, __be32 *p,
340 struct nfsd_createargs *args)
342 if ( !(p = decode_fh(p, &args->fh))
343 || !(p = decode_filename(p, &args->name, &args->len)))
345 p = decode_sattr(p, &args->attrs);
347 return xdr_argsize_check(rqstp, p);
351 nfssvc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p,
352 struct nfsd_renameargs *args)
354 if (!(p = decode_fh(p, &args->ffh))
355 || !(p = decode_filename(p, &args->fname, &args->flen))
356 || !(p = decode_fh(p, &args->tfh))
357 || !(p = decode_filename(p, &args->tname, &args->tlen)))
360 return xdr_argsize_check(rqstp, p);
364 nfssvc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd_readlinkargs *args)
366 if (!(p = decode_fh(p, &args->fh)))
368 args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused++]);
370 return xdr_argsize_check(rqstp, p);
374 nfssvc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p,
375 struct nfsd_linkargs *args)
377 if (!(p = decode_fh(p, &args->ffh))
378 || !(p = decode_fh(p, &args->tfh))
379 || !(p = decode_filename(p, &args->tname, &args->tlen)))
382 return xdr_argsize_check(rqstp, p);
386 nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p,
387 struct nfsd_symlinkargs *args)
389 if ( !(p = decode_fh(p, &args->ffh))
390 || !(p = decode_filename(p, &args->fname, &args->flen))
391 || !(p = decode_pathname(p, &args->tname, &args->tlen)))
393 p = decode_sattr(p, &args->attrs);
395 return xdr_argsize_check(rqstp, p);
399 nfssvc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
400 struct nfsd_readdirargs *args)
402 if (!(p = decode_fh(p, &args->fh)))
404 args->cookie = ntohl(*p++);
405 args->count = ntohl(*p++);
406 if (args->count > PAGE_SIZE)
407 args->count = PAGE_SIZE;
409 args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused++]);
411 return xdr_argsize_check(rqstp, p);
415 * XDR encode functions
418 nfssvc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
420 return xdr_ressize_check(rqstp, p);
424 nfssvc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
425 struct nfsd_attrstat *resp)
427 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
428 return xdr_ressize_check(rqstp, p);
432 nfssvc_encode_diropres(struct svc_rqst *rqstp, __be32 *p,
433 struct nfsd_diropres *resp)
435 p = encode_fh(p, &resp->fh);
436 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
437 return xdr_ressize_check(rqstp, p);
441 nfssvc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p,
442 struct nfsd_readlinkres *resp)
444 *p++ = htonl(resp->len);
445 xdr_ressize_check(rqstp, p);
446 rqstp->rq_res.page_len = resp->len;
448 /* need to pad the tail */
449 rqstp->rq_res.tail[0].iov_base = p;
451 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
457 nfssvc_encode_readres(struct svc_rqst *rqstp, __be32 *p,
458 struct nfsd_readres *resp)
460 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
461 *p++ = htonl(resp->count);
462 xdr_ressize_check(rqstp, p);
464 /* now update rqstp->rq_res to reflect data aswell */
465 rqstp->rq_res.page_len = resp->count;
466 if (resp->count & 3) {
467 /* need to pad the tail */
468 rqstp->rq_res.tail[0].iov_base = p;
470 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count&3);
476 nfssvc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
477 struct nfsd_readdirres *resp)
479 xdr_ressize_check(rqstp, p);
481 *p++ = 0; /* no more entries */
482 *p++ = htonl((resp->common.err == nfserr_eof));
483 rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1;
489 nfssvc_encode_statfsres(struct svc_rqst *rqstp, __be32 *p,
490 struct nfsd_statfsres *resp)
492 struct kstatfs *stat = &resp->stats;
494 *p++ = htonl(NFSSVC_MAXBLKSIZE_V2); /* max transfer size */
495 *p++ = htonl(stat->f_bsize);
496 *p++ = htonl(stat->f_blocks);
497 *p++ = htonl(stat->f_bfree);
498 *p++ = htonl(stat->f_bavail);
499 return xdr_ressize_check(rqstp, p);
503 nfssvc_encode_entry(void *ccdv, const char *name,
504 int namlen, loff_t offset, u64 ino, unsigned int d_type)
506 struct readdir_cd *ccd = ccdv;
507 struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common);
508 __be32 *p = cd->buffer;
512 dprintk("nfsd: entry(%.*s off %ld ino %ld)\n",
513 namlen, name, offset, ino);
516 if (offset > ~((u32) 0)) {
517 cd->common.err = nfserr_fbig;
521 *cd->offset = htonl(offset);
522 if (namlen > NFS2_MAXNAMLEN)
523 namlen = NFS2_MAXNAMLEN;/* truncate filename */
525 slen = XDR_QUADLEN(namlen);
526 if ((buflen = cd->buflen - slen - 4) < 0) {
527 cd->common.err = nfserr_toosmall;
530 if (ino > ~((u32) 0)) {
531 cd->common.err = nfserr_fbig;
534 *p++ = xdr_one; /* mark entry present */
535 *p++ = htonl((u32) ino); /* file id */
536 p = xdr_encode_array(p, name, namlen);/* name length & name */
537 cd->offset = p; /* remember pointer */
538 *p++ = htonl(~0U); /* offset of next entry */
542 cd->common.err = nfs_ok;
547 * XDR release functions
550 nfssvc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
551 struct nfsd_fhandle *resp)