2 * XDR support for nfsd/protocol version 3.
4 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
6 * 2003-08-09 Jamie Lokier: Use htonl() for nanoseconds, not htons()!
9 #include <linux/namei.h>
10 #include <linux/sunrpc/svc_xprt.h>
16 #define NFSDDBG_FACILITY NFSDDBG_XDR
20 * Mapping of S_IF* types to NFS file types
22 static u32 nfs3_ftypes[] = {
23 NF3NON, NF3FIFO, NF3CHR, NF3BAD,
24 NF3DIR, NF3BAD, NF3BLK, NF3BAD,
25 NF3REG, NF3BAD, NF3LNK, NF3BAD,
26 NF3SOCK, NF3BAD, NF3LNK, NF3BAD,
30 * XDR functions for basic NFS types
33 encode_time3(__be32 *p, struct timespec *time)
35 *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
40 decode_time3(__be32 *p, struct timespec *time)
42 time->tv_sec = ntohl(*p++);
43 time->tv_nsec = ntohl(*p++);
48 decode_fh(__be32 *p, struct svc_fh *fhp)
51 fh_init(fhp, NFS3_FHSIZE);
53 if (size > NFS3_FHSIZE)
56 memcpy(&fhp->fh_handle.fh_base, p, size);
57 fhp->fh_handle.fh_size = size;
58 return p + XDR_QUADLEN(size);
61 /* Helper function for NFSv3 ACL code */
62 __be32 *nfs3svc_decode_fh(__be32 *p, struct svc_fh *fhp)
64 return decode_fh(p, fhp);
68 encode_fh(__be32 *p, struct svc_fh *fhp)
70 unsigned int size = fhp->fh_handle.fh_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);
78 * Decode a file name and make sure that the path contains
79 * no slashes or null bytes.
82 decode_filename(__be32 *p, char **namp, unsigned int *lenp)
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 == '/')
98 decode_sattr3(__be32 *p, struct iattr *iap)
105 iap->ia_valid |= ATTR_MODE;
106 iap->ia_mode = ntohl(*p++);
109 iap->ia_uid = make_kuid(&init_user_ns, ntohl(*p++));
110 if (uid_valid(iap->ia_uid))
111 iap->ia_valid |= ATTR_UID;
114 iap->ia_gid = make_kgid(&init_user_ns, ntohl(*p++));
115 if (gid_valid(iap->ia_gid))
116 iap->ia_valid |= ATTR_GID;
121 iap->ia_valid |= ATTR_SIZE;
122 p = xdr_decode_hyper(p, &newsize);
123 iap->ia_size = min_t(u64, newsize, NFS_OFFSET_MAX);
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++);
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++);
142 static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp)
145 switch(fsid_source(fhp)) {
148 p = xdr_encode_hyper(p, (u64)huge_encode_dev
149 (fhp->fh_dentry->d_sb->s_dev));
151 case FSIDSOURCE_FSID:
152 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
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);
164 encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
167 *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
168 *p++ = htonl((u32) (stat->mode & S_IALLUGO));
169 *p++ = htonl((u32) stat->nlink);
170 *p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
171 *p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid));
172 if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) {
173 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
175 p = xdr_encode_hyper(p, (u64) stat->size);
177 p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
178 *p++ = htonl((u32) MAJOR(stat->rdev));
179 *p++ = htonl((u32) MINOR(stat->rdev));
180 p = encode_fsid(p, fhp);
181 p = xdr_encode_hyper(p, stat->ino);
182 p = encode_time3(p, &stat->atime);
183 p = encode_time3(p, &stat->mtime);
184 p = encode_time3(p, &stat->ctime);
190 encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
192 /* Attributes to follow */
194 return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr);
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.
203 encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
205 struct dentry *dentry = fhp->fh_dentry;
206 if (dentry && d_really_is_positive(dentry)) {
210 err = fh_getattr(fhp, &stat);
212 *p++ = xdr_one; /* attributes follow */
213 lease_get_mtime(d_inode(dentry), &stat.mtime);
214 return encode_fattr3(rqstp, p, fhp, &stat);
221 /* Helper for NFSv3 ACLs */
223 nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
225 return encode_post_op_attr(rqstp, p, fhp);
229 * Enocde weak cache consistency data
232 encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
234 struct dentry *dentry = fhp->fh_dentry;
236 if (dentry && d_really_is_positive(dentry) && fhp->fh_post_saved) {
237 if (fhp->fh_pre_saved) {
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);
245 return encode_saved_post_attr(rqstp, p, fhp);
247 /* no pre- or post-attrs */
249 return encode_post_op_attr(rqstp, p, fhp);
253 * Fill in the post_op attr for the wcc data
255 void fill_post_wcc(struct svc_fh *fhp)
259 if (fhp->fh_post_saved)
260 printk("nfsd: inode locked twice during operation.\n");
262 err = fh_getattr(fhp, &fhp->fh_post_attr);
263 fhp->fh_post_change = d_inode(fhp->fh_dentry)->i_version;
265 fhp->fh_post_saved = false;
266 /* Grab the ctime anyway - set_change_info might use it */
267 fhp->fh_post_attr.ctime = d_inode(fhp->fh_dentry)->i_ctime;
269 fhp->fh_post_saved = true;
273 * XDR decode functions
276 nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p)
278 struct nfsd_fhandle *args = rqstp->rq_argp;
280 p = decode_fh(p, &args->fh);
283 return xdr_argsize_check(rqstp, p);
287 nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p)
289 struct nfsd3_sattrargs *args = rqstp->rq_argp;
291 p = decode_fh(p, &args->fh);
294 p = decode_sattr3(p, &args->attrs);
296 if ((args->check_guard = ntohl(*p++)) != 0) {
297 struct timespec time;
298 p = decode_time3(p, &time);
299 args->guardtime = time.tv_sec;
302 return xdr_argsize_check(rqstp, p);
306 nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p)
308 struct nfsd3_diropargs *args = rqstp->rq_argp;
310 if (!(p = decode_fh(p, &args->fh))
311 || !(p = decode_filename(p, &args->name, &args->len)))
314 return xdr_argsize_check(rqstp, p);
318 nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p)
320 struct nfsd3_accessargs *args = rqstp->rq_argp;
322 p = decode_fh(p, &args->fh);
325 args->access = ntohl(*p++);
327 return xdr_argsize_check(rqstp, p);
331 nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p)
333 struct nfsd3_readargs *args = rqstp->rq_argp;
336 u32 max_blocksize = svc_max_payload(rqstp);
338 p = decode_fh(p, &args->fh);
341 p = xdr_decode_hyper(p, &args->offset);
343 args->count = ntohl(*p++);
344 len = min(args->count, max_blocksize);
346 /* set up the kvec */
349 struct page *p = *(rqstp->rq_next_page++);
351 rqstp->rq_vec[v].iov_base = page_address(p);
352 rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
353 len -= rqstp->rq_vec[v].iov_len;
357 return xdr_argsize_check(rqstp, p);
361 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p)
363 struct nfsd3_writeargs *args = rqstp->rq_argp;
364 unsigned int len, v, hdr, dlen;
365 u32 max_blocksize = svc_max_payload(rqstp);
366 struct kvec *head = rqstp->rq_arg.head;
367 struct kvec *tail = rqstp->rq_arg.tail;
369 p = decode_fh(p, &args->fh);
372 p = xdr_decode_hyper(p, &args->offset);
374 args->count = ntohl(*p++);
375 args->stable = ntohl(*p++);
376 len = args->len = ntohl(*p++);
377 if ((void *)p > head->iov_base + head->iov_len)
380 * The count must equal the amount of data passed.
382 if (args->count != args->len)
386 * Check to make sure that we got the right number of
389 hdr = (void*)p - head->iov_base;
390 dlen = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len - hdr;
392 * Round the length of the data which was specified up to
393 * the next multiple of XDR units and then compare that
394 * against the length which was actually received.
395 * Note that when RPCSEC/GSS (for example) is used, the
396 * data buffer can be padded so dlen might be larger
397 * than required. It must never be smaller.
399 if (dlen < XDR_QUADLEN(len)*4)
402 if (args->count > max_blocksize) {
403 args->count = max_blocksize;
404 len = args->len = max_blocksize;
406 rqstp->rq_vec[0].iov_base = (void*)p;
407 rqstp->rq_vec[0].iov_len = head->iov_len - hdr;
409 while (len > rqstp->rq_vec[v].iov_len) {
410 len -= rqstp->rq_vec[v].iov_len;
412 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
413 rqstp->rq_vec[v].iov_len = PAGE_SIZE;
415 rqstp->rq_vec[v].iov_len = len;
421 nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p)
423 struct nfsd3_createargs *args = rqstp->rq_argp;
425 if (!(p = decode_fh(p, &args->fh))
426 || !(p = decode_filename(p, &args->name, &args->len)))
429 switch (args->createmode = ntohl(*p++)) {
430 case NFS3_CREATE_UNCHECKED:
431 case NFS3_CREATE_GUARDED:
432 p = decode_sattr3(p, &args->attrs);
434 case NFS3_CREATE_EXCLUSIVE:
442 return xdr_argsize_check(rqstp, p);
446 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p)
448 struct nfsd3_createargs *args = rqstp->rq_argp;
450 if (!(p = decode_fh(p, &args->fh)) ||
451 !(p = decode_filename(p, &args->name, &args->len)))
453 p = decode_sattr3(p, &args->attrs);
455 return xdr_argsize_check(rqstp, p);
459 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p)
461 struct nfsd3_symlinkargs *args = rqstp->rq_argp;
462 unsigned int len, avail;
466 if (!(p = decode_fh(p, &args->ffh)) ||
467 !(p = decode_filename(p, &args->fname, &args->flen))
470 p = decode_sattr3(p, &args->attrs);
472 /* now decode the pathname, which might be larger than the first page.
473 * As we have to check for nul's anyway, we copy it into a new page
474 * This page appears in the rq_res.pages list, but as pages_len is always
475 * 0, it won't get in the way
478 if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE)
480 args->tname = new = page_address(*(rqstp->rq_next_page++));
482 /* first copy and check from the first page */
484 vec = &rqstp->rq_arg.head[0];
485 if ((void *)old > vec->iov_base + vec->iov_len)
487 avail = vec->iov_len - (old - (char*)vec->iov_base);
488 while (len && avail && *old) {
493 /* now copy next page if there is one */
494 if (len && !avail && rqstp->rq_arg.page_len) {
495 avail = min_t(unsigned int, rqstp->rq_arg.page_len, PAGE_SIZE);
496 old = page_address(rqstp->rq_arg.pages[0]);
498 while (len && avail && *old) {
511 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p)
513 struct nfsd3_mknodargs *args = rqstp->rq_argp;
515 if (!(p = decode_fh(p, &args->fh))
516 || !(p = decode_filename(p, &args->name, &args->len)))
519 args->ftype = ntohl(*p++);
521 if (args->ftype == NF3BLK || args->ftype == NF3CHR
522 || args->ftype == NF3SOCK || args->ftype == NF3FIFO)
523 p = decode_sattr3(p, &args->attrs);
525 if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
526 args->major = ntohl(*p++);
527 args->minor = ntohl(*p++);
530 return xdr_argsize_check(rqstp, p);
534 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p)
536 struct nfsd3_renameargs *args = rqstp->rq_argp;
538 if (!(p = decode_fh(p, &args->ffh))
539 || !(p = decode_filename(p, &args->fname, &args->flen))
540 || !(p = decode_fh(p, &args->tfh))
541 || !(p = decode_filename(p, &args->tname, &args->tlen)))
544 return xdr_argsize_check(rqstp, p);
548 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p)
550 struct nfsd3_readlinkargs *args = rqstp->rq_argp;
552 p = decode_fh(p, &args->fh);
555 args->buffer = page_address(*(rqstp->rq_next_page++));
557 return xdr_argsize_check(rqstp, p);
561 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p)
563 struct nfsd3_linkargs *args = rqstp->rq_argp;
565 if (!(p = decode_fh(p, &args->ffh))
566 || !(p = decode_fh(p, &args->tfh))
567 || !(p = decode_filename(p, &args->tname, &args->tlen)))
570 return xdr_argsize_check(rqstp, p);
574 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p)
576 struct nfsd3_readdirargs *args = rqstp->rq_argp;
577 p = decode_fh(p, &args->fh);
580 p = xdr_decode_hyper(p, &args->cookie);
581 args->verf = p; p += 2;
583 args->count = ntohl(*p++);
584 args->count = min_t(u32, args->count, PAGE_SIZE);
585 args->buffer = page_address(*(rqstp->rq_next_page++));
587 return xdr_argsize_check(rqstp, p);
591 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p)
593 struct nfsd3_readdirargs *args = rqstp->rq_argp;
595 u32 max_blocksize = svc_max_payload(rqstp);
597 p = decode_fh(p, &args->fh);
600 p = xdr_decode_hyper(p, &args->cookie);
601 args->verf = p; p += 2;
602 args->dircount = ntohl(*p++);
603 args->count = ntohl(*p++);
605 len = args->count = min(args->count, max_blocksize);
607 struct page *p = *(rqstp->rq_next_page++);
609 args->buffer = page_address(p);
613 return xdr_argsize_check(rqstp, p);
617 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p)
619 struct nfsd3_commitargs *args = rqstp->rq_argp;
620 p = decode_fh(p, &args->fh);
623 p = xdr_decode_hyper(p, &args->offset);
624 args->count = ntohl(*p++);
626 return xdr_argsize_check(rqstp, p);
630 * XDR encode functions
633 * There must be an encoding function for void results so svc_process
634 * will work properly.
637 nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
639 return xdr_ressize_check(rqstp, p);
644 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
645 struct nfsd3_attrstat *resp)
647 if (resp->status == 0) {
648 lease_get_mtime(d_inode(resp->fh.fh_dentry),
650 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
652 return xdr_ressize_check(rqstp, p);
655 /* SETATTR, REMOVE, RMDIR */
657 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p,
658 struct nfsd3_attrstat *resp)
660 p = encode_wcc_data(rqstp, p, &resp->fh);
661 return xdr_ressize_check(rqstp, p);
666 nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p,
667 struct nfsd3_diropres *resp)
669 if (resp->status == 0) {
670 p = encode_fh(p, &resp->fh);
671 p = encode_post_op_attr(rqstp, p, &resp->fh);
673 p = encode_post_op_attr(rqstp, p, &resp->dirfh);
674 return xdr_ressize_check(rqstp, p);
679 nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p,
680 struct nfsd3_accessres *resp)
682 p = encode_post_op_attr(rqstp, p, &resp->fh);
683 if (resp->status == 0)
684 *p++ = htonl(resp->access);
685 return xdr_ressize_check(rqstp, p);
690 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p,
691 struct nfsd3_readlinkres *resp)
693 p = encode_post_op_attr(rqstp, p, &resp->fh);
694 if (resp->status == 0) {
695 *p++ = htonl(resp->len);
696 xdr_ressize_check(rqstp, p);
697 rqstp->rq_res.page_len = resp->len;
699 /* need to pad the tail */
700 rqstp->rq_res.tail[0].iov_base = p;
702 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
706 return xdr_ressize_check(rqstp, p);
711 nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p,
712 struct nfsd3_readres *resp)
714 p = encode_post_op_attr(rqstp, p, &resp->fh);
715 if (resp->status == 0) {
716 *p++ = htonl(resp->count);
717 *p++ = htonl(resp->eof);
718 *p++ = htonl(resp->count); /* xdr opaque count */
719 xdr_ressize_check(rqstp, p);
720 /* now update rqstp->rq_res to reflect data as well */
721 rqstp->rq_res.page_len = resp->count;
722 if (resp->count & 3) {
723 /* need to pad the tail */
724 rqstp->rq_res.tail[0].iov_base = p;
726 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
730 return xdr_ressize_check(rqstp, p);
735 nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p,
736 struct nfsd3_writeres *resp)
738 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
740 p = encode_wcc_data(rqstp, p, &resp->fh);
741 if (resp->status == 0) {
742 *p++ = htonl(resp->count);
743 *p++ = htonl(resp->committed);
744 *p++ = htonl(nn->nfssvc_boot.tv_sec);
745 *p++ = htonl(nn->nfssvc_boot.tv_usec);
747 return xdr_ressize_check(rqstp, p);
750 /* CREATE, MKDIR, SYMLINK, MKNOD */
752 nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p,
753 struct nfsd3_diropres *resp)
755 if (resp->status == 0) {
757 p = encode_fh(p, &resp->fh);
758 p = encode_post_op_attr(rqstp, p, &resp->fh);
760 p = encode_wcc_data(rqstp, p, &resp->dirfh);
761 return xdr_ressize_check(rqstp, p);
766 nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p,
767 struct nfsd3_renameres *resp)
769 p = encode_wcc_data(rqstp, p, &resp->ffh);
770 p = encode_wcc_data(rqstp, p, &resp->tfh);
771 return xdr_ressize_check(rqstp, p);
776 nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p,
777 struct nfsd3_linkres *resp)
779 p = encode_post_op_attr(rqstp, p, &resp->fh);
780 p = encode_wcc_data(rqstp, p, &resp->tfh);
781 return xdr_ressize_check(rqstp, p);
786 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
787 struct nfsd3_readdirres *resp)
789 p = encode_post_op_attr(rqstp, p, &resp->fh);
791 if (resp->status == 0) {
792 /* stupid readdir cookie */
793 memcpy(p, resp->verf, 8); p += 2;
794 xdr_ressize_check(rqstp, p);
795 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
796 return 1; /*No room for trailer */
797 rqstp->rq_res.page_len = (resp->count) << 2;
799 /* add the 'tail' to the end of the 'head' page - page 0. */
800 rqstp->rq_res.tail[0].iov_base = p;
801 *p++ = 0; /* no more entries */
802 *p++ = htonl(resp->common.err == nfserr_eof);
803 rqstp->rq_res.tail[0].iov_len = 2<<2;
806 return xdr_ressize_check(rqstp, p);
810 encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
813 *p++ = xdr_one; /* mark entry present */
814 p = xdr_encode_hyper(p, ino); /* file id */
815 p = xdr_encode_array(p, name, namlen);/* name length & name */
817 cd->offset = p; /* remember pointer */
818 p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
824 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
825 const char *name, int namlen, u64 ino)
827 struct svc_export *exp;
828 struct dentry *dparent, *dchild;
829 __be32 rv = nfserr_noent;
831 dparent = cd->fh.fh_dentry;
832 exp = cd->fh.fh_export;
834 if (isdotent(name, namlen)) {
836 dchild = dget_parent(dparent);
837 /* filesystem root - cannot return filehandle for ".." */
838 if (dchild == dparent)
841 dchild = dget(dparent);
843 dchild = lookup_one_len_unlocked(name, dparent, namlen);
846 if (d_mountpoint(dchild))
848 if (d_really_is_negative(dchild))
850 if (dchild->d_inode->i_ino != ino)
852 rv = fh_compose(fhp, exp, dchild, &cd->fh);
858 static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen, u64 ino)
860 struct svc_fh *fh = &cd->scratch;
863 fh_init(fh, NFS3_FHSIZE);
864 err = compose_entry_fh(cd, fh, name, namlen, ino);
870 p = encode_post_op_attr(cd->rqstp, p, fh);
871 *p++ = xdr_one; /* yes, a file handle follows */
872 p = encode_fh(p, fh);
879 * Encode a directory entry. This one works for both normal readdir
881 * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
882 * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
884 * The readdirplus baggage is 1+21 words for post_op_attr, plus the
888 #define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1)
889 #define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
891 encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
892 loff_t offset, u64 ino, unsigned int d_type, int plus)
894 struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
896 __be32 *p = cd->buffer;
897 caddr_t curr_page_addr = NULL;
899 int slen; /* string (name) length */
900 int elen; /* estimated entry length in words */
901 int num_entry_words = 0; /* actual number of words */
904 u64 offset64 = offset;
906 if (unlikely(cd->offset1)) {
907 /* we ended up with offset on a page boundary */
908 *cd->offset = htonl(offset64 >> 32);
909 *cd->offset1 = htonl(offset64 & 0xffffffff);
912 xdr_encode_hyper(cd->offset, offset64);
917 dprintk("encode_entry(%.*s @%ld%s)\n",
918 namlen, name, (long) offset, plus? " plus" : "");
921 /* truncate filename if too long */
922 namlen = min(namlen, NFS3_MAXNAMLEN);
924 slen = XDR_QUADLEN(namlen);
925 elen = slen + NFS3_ENTRY_BAGGAGE
926 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
928 if (cd->buflen < elen) {
929 cd->common.err = nfserr_toosmall;
933 /* determine which page in rq_respages[] we are currently filling */
934 for (page = cd->rqstp->rq_respages + 1;
935 page < cd->rqstp->rq_next_page; page++) {
936 curr_page_addr = page_address(*page);
938 if (((caddr_t)cd->buffer >= curr_page_addr) &&
939 ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE))
943 if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
944 /* encode entry in current page */
946 p = encode_entry_baggage(cd, p, name, namlen, ino);
949 p = encode_entryplus_baggage(cd, p, name, namlen, ino);
950 num_entry_words = p - cd->buffer;
951 } else if (*(page+1) != NULL) {
952 /* temporarily encode entry into next page, then move back to
953 * current and next page in rq_respages[] */
957 /* grab next page for temporary storage of entry */
958 p1 = tmp = page_address(*(page+1));
960 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
963 p1 = encode_entryplus_baggage(cd, p1, name, namlen, ino);
965 /* determine entry word length and lengths to go in pages */
966 num_entry_words = p1 - tmp;
967 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
968 if ((num_entry_words << 2) < len1) {
969 /* the actual number of words in the entry is less
970 * than elen and can still fit in the current page
972 memmove(p, tmp, num_entry_words << 2);
973 p += num_entry_words;
976 cd->offset = cd->buffer + (cd->offset - tmp);
978 unsigned int offset_r = (cd->offset - tmp) << 2;
980 /* update pointer to offset location.
981 * This is a 64bit quantity, so we need to
983 * - entirely in first page
984 * - entirely in second page
985 * - 4 bytes in each page
987 if (offset_r + 8 <= len1) {
988 cd->offset = p + (cd->offset - tmp);
989 } else if (offset_r >= len1) {
990 cd->offset -= len1 >> 2;
992 /* sitting on the fence */
993 BUG_ON(offset_r != len1 - 4);
994 cd->offset = p + (cd->offset - tmp);
998 len2 = (num_entry_words << 2) - len1;
1000 /* move from temp page to current and next pages */
1001 memmove(p, tmp, len1);
1002 memmove(tmp, (caddr_t)tmp+len1, len2);
1004 p = tmp + (len2 >> 2);
1008 cd->common.err = nfserr_toosmall;
1012 cd->buflen -= num_entry_words;
1014 cd->common.err = nfs_ok;
1020 nfs3svc_encode_entry(void *cd, const char *name,
1021 int namlen, loff_t offset, u64 ino, unsigned int d_type)
1023 return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
1027 nfs3svc_encode_entry_plus(void *cd, const char *name,
1028 int namlen, loff_t offset, u64 ino,
1029 unsigned int d_type)
1031 return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1036 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p,
1037 struct nfsd3_fsstatres *resp)
1039 struct kstatfs *s = &resp->stats;
1040 u64 bs = s->f_bsize;
1042 *p++ = xdr_zero; /* no post_op_attr */
1044 if (resp->status == 0) {
1045 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */
1046 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */
1047 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */
1048 p = xdr_encode_hyper(p, s->f_files); /* total inodes */
1049 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */
1050 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */
1051 *p++ = htonl(resp->invarsec); /* mean unchanged time */
1053 return xdr_ressize_check(rqstp, p);
1058 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p,
1059 struct nfsd3_fsinfores *resp)
1061 *p++ = xdr_zero; /* no post_op_attr */
1063 if (resp->status == 0) {
1064 *p++ = htonl(resp->f_rtmax);
1065 *p++ = htonl(resp->f_rtpref);
1066 *p++ = htonl(resp->f_rtmult);
1067 *p++ = htonl(resp->f_wtmax);
1068 *p++ = htonl(resp->f_wtpref);
1069 *p++ = htonl(resp->f_wtmult);
1070 *p++ = htonl(resp->f_dtpref);
1071 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1074 *p++ = htonl(resp->f_properties);
1077 return xdr_ressize_check(rqstp, p);
1082 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p,
1083 struct nfsd3_pathconfres *resp)
1085 *p++ = xdr_zero; /* no post_op_attr */
1087 if (resp->status == 0) {
1088 *p++ = htonl(resp->p_link_max);
1089 *p++ = htonl(resp->p_name_max);
1090 *p++ = htonl(resp->p_no_trunc);
1091 *p++ = htonl(resp->p_chown_restricted);
1092 *p++ = htonl(resp->p_case_insensitive);
1093 *p++ = htonl(resp->p_case_preserving);
1096 return xdr_ressize_check(rqstp, p);
1101 nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p,
1102 struct nfsd3_commitres *resp)
1104 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1106 p = encode_wcc_data(rqstp, p, &resp->fh);
1107 /* Write verifier */
1108 if (resp->status == 0) {
1109 *p++ = htonl(nn->nfssvc_boot.tv_sec);
1110 *p++ = htonl(nn->nfssvc_boot.tv_usec);
1112 return xdr_ressize_check(rqstp, p);
1116 * XDR release functions
1119 nfs3svc_release_fhandle(struct svc_rqst *rqstp)
1121 struct nfsd3_attrstat *resp = rqstp->rq_resp;
1127 nfs3svc_release_fhandle2(struct svc_rqst *rqstp)
1129 struct nfsd3_fhandle_pair *resp = rqstp->rq_resp;