1 // SPDX-License-Identifier: GPL-2.0
3 * XDR support for nfsd/protocol version 3.
5 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
7 * 2003-08-09 Jamie Lokier: Use htonl() for nanoseconds, not htons()!
10 #include <linux/namei.h>
11 #include <linux/sunrpc/svc_xprt.h>
17 #define NFSDDBG_FACILITY NFSDDBG_XDR
21 * Mapping of S_IF* types to NFS file types
23 static u32 nfs3_ftypes[] = {
24 NF3NON, NF3FIFO, NF3CHR, NF3BAD,
25 NF3DIR, NF3BAD, NF3BLK, NF3BAD,
26 NF3REG, NF3BAD, NF3LNK, NF3BAD,
27 NF3SOCK, NF3BAD, NF3LNK, NF3BAD,
31 * XDR functions for basic NFS types
34 encode_time3(__be32 *p, struct timespec *time)
36 *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
41 decode_time3(__be32 *p, struct timespec *time)
43 time->tv_sec = ntohl(*p++);
44 time->tv_nsec = ntohl(*p++);
49 decode_fh(__be32 *p, struct svc_fh *fhp)
52 fh_init(fhp, NFS3_FHSIZE);
54 if (size > NFS3_FHSIZE)
57 memcpy(&fhp->fh_handle.fh_base, p, size);
58 fhp->fh_handle.fh_size = size;
59 return p + XDR_QUADLEN(size);
62 /* Helper function for NFSv3 ACL code */
63 __be32 *nfs3svc_decode_fh(__be32 *p, struct svc_fh *fhp)
65 return decode_fh(p, fhp);
69 encode_fh(__be32 *p, struct svc_fh *fhp)
71 unsigned int size = fhp->fh_handle.fh_size;
73 if (size) p[XDR_QUADLEN(size)-1]=0;
74 memcpy(p, &fhp->fh_handle.fh_base, size);
75 return p + XDR_QUADLEN(size);
79 * Decode a file name and make sure that the path contains
80 * no slashes or null bytes.
83 decode_filename(__be32 *p, char **namp, unsigned int *lenp)
88 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) {
89 for (i = 0, name = *namp; i < *lenp; i++, name++) {
90 if (*name == '\0' || *name == '/')
99 decode_sattr3(__be32 *p, struct iattr *iap)
106 iap->ia_valid |= ATTR_MODE;
107 iap->ia_mode = ntohl(*p++);
110 iap->ia_uid = make_kuid(&init_user_ns, ntohl(*p++));
111 if (uid_valid(iap->ia_uid))
112 iap->ia_valid |= ATTR_UID;
115 iap->ia_gid = make_kgid(&init_user_ns, ntohl(*p++));
116 if (gid_valid(iap->ia_gid))
117 iap->ia_valid |= ATTR_GID;
122 iap->ia_valid |= ATTR_SIZE;
123 p = xdr_decode_hyper(p, &newsize);
124 iap->ia_size = min_t(u64, newsize, NFS_OFFSET_MAX);
126 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
127 iap->ia_valid |= ATTR_ATIME;
128 } else if (tmp == 2) { /* set to client time */
129 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
130 iap->ia_atime.tv_sec = ntohl(*p++);
131 iap->ia_atime.tv_nsec = ntohl(*p++);
133 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
134 iap->ia_valid |= ATTR_MTIME;
135 } else if (tmp == 2) { /* set to client time */
136 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
137 iap->ia_mtime.tv_sec = ntohl(*p++);
138 iap->ia_mtime.tv_nsec = ntohl(*p++);
143 static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp)
146 switch(fsid_source(fhp)) {
149 p = xdr_encode_hyper(p, (u64)huge_encode_dev
150 (fhp->fh_dentry->d_sb->s_dev));
152 case FSIDSOURCE_FSID:
153 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
155 case FSIDSOURCE_UUID:
156 f = ((u64*)fhp->fh_export->ex_uuid)[0];
157 f ^= ((u64*)fhp->fh_export->ex_uuid)[1];
158 p = xdr_encode_hyper(p, f);
165 encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
168 *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
169 *p++ = htonl((u32) (stat->mode & S_IALLUGO));
170 *p++ = htonl((u32) stat->nlink);
171 *p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
172 *p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid));
173 if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) {
174 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
176 p = xdr_encode_hyper(p, (u64) stat->size);
178 p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
179 *p++ = htonl((u32) MAJOR(stat->rdev));
180 *p++ = htonl((u32) MINOR(stat->rdev));
181 p = encode_fsid(p, fhp);
182 p = xdr_encode_hyper(p, stat->ino);
183 p = encode_time3(p, &stat->atime);
184 p = encode_time3(p, &stat->mtime);
185 p = encode_time3(p, &stat->ctime);
191 encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
193 /* Attributes to follow */
195 return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr);
199 * Encode post-operation attributes.
200 * The inode may be NULL if the call failed because of a stale file
201 * handle. In this case, no attributes are returned.
204 encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
206 struct dentry *dentry = fhp->fh_dentry;
207 if (dentry && d_really_is_positive(dentry)) {
211 err = fh_getattr(fhp, &stat);
213 *p++ = xdr_one; /* attributes follow */
214 lease_get_mtime(d_inode(dentry), &stat.mtime);
215 return encode_fattr3(rqstp, p, fhp, &stat);
222 /* Helper for NFSv3 ACLs */
224 nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
226 return encode_post_op_attr(rqstp, p, fhp);
230 * Enocde weak cache consistency data
233 encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
235 struct dentry *dentry = fhp->fh_dentry;
237 if (dentry && d_really_is_positive(dentry) && fhp->fh_post_saved) {
238 if (fhp->fh_pre_saved) {
240 p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
241 p = encode_time3(p, &fhp->fh_pre_mtime);
242 p = encode_time3(p, &fhp->fh_pre_ctime);
246 return encode_saved_post_attr(rqstp, p, fhp);
248 /* no pre- or post-attrs */
250 return encode_post_op_attr(rqstp, p, fhp);
254 * Fill in the post_op attr for the wcc data
256 void fill_post_wcc(struct svc_fh *fhp)
260 if (fhp->fh_post_saved)
261 printk("nfsd: inode locked twice during operation.\n");
263 err = fh_getattr(fhp, &fhp->fh_post_attr);
264 fhp->fh_post_change = nfsd4_change_attribute(d_inode(fhp->fh_dentry));
266 fhp->fh_post_saved = false;
267 /* Grab the ctime anyway - set_change_info might use it */
268 fhp->fh_post_attr.ctime = d_inode(fhp->fh_dentry)->i_ctime;
270 fhp->fh_post_saved = true;
274 * XDR decode functions
277 nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p)
279 struct nfsd_fhandle *args = rqstp->rq_argp;
281 p = decode_fh(p, &args->fh);
284 return xdr_argsize_check(rqstp, p);
288 nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p)
290 struct nfsd3_sattrargs *args = rqstp->rq_argp;
292 p = decode_fh(p, &args->fh);
295 p = decode_sattr3(p, &args->attrs);
297 if ((args->check_guard = ntohl(*p++)) != 0) {
298 struct timespec time;
299 p = decode_time3(p, &time);
300 args->guardtime = time.tv_sec;
303 return xdr_argsize_check(rqstp, p);
307 nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p)
309 struct nfsd3_diropargs *args = rqstp->rq_argp;
311 if (!(p = decode_fh(p, &args->fh))
312 || !(p = decode_filename(p, &args->name, &args->len)))
315 return xdr_argsize_check(rqstp, p);
319 nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p)
321 struct nfsd3_accessargs *args = rqstp->rq_argp;
323 p = decode_fh(p, &args->fh);
326 args->access = ntohl(*p++);
328 return xdr_argsize_check(rqstp, p);
332 nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p)
334 struct nfsd3_readargs *args = rqstp->rq_argp;
337 u32 max_blocksize = svc_max_payload(rqstp);
339 p = decode_fh(p, &args->fh);
342 p = xdr_decode_hyper(p, &args->offset);
344 args->count = ntohl(*p++);
345 len = min(args->count, max_blocksize);
347 /* set up the kvec */
350 struct page *p = *(rqstp->rq_next_page++);
352 rqstp->rq_vec[v].iov_base = page_address(p);
353 rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
354 len -= rqstp->rq_vec[v].iov_len;
358 return xdr_argsize_check(rqstp, p);
362 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p)
364 struct nfsd3_writeargs *args = rqstp->rq_argp;
365 unsigned int len, v, hdr, dlen;
366 u32 max_blocksize = svc_max_payload(rqstp);
367 struct kvec *head = rqstp->rq_arg.head;
368 struct kvec *tail = rqstp->rq_arg.tail;
370 p = decode_fh(p, &args->fh);
373 p = xdr_decode_hyper(p, &args->offset);
375 args->count = ntohl(*p++);
376 args->stable = ntohl(*p++);
377 len = args->len = ntohl(*p++);
378 if ((void *)p > head->iov_base + head->iov_len)
381 * The count must equal the amount of data passed.
383 if (args->count != args->len)
387 * Check to make sure that we got the right number of
390 hdr = (void*)p - head->iov_base;
391 dlen = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len - hdr;
393 * Round the length of the data which was specified up to
394 * the next multiple of XDR units and then compare that
395 * against the length which was actually received.
396 * Note that when RPCSEC/GSS (for example) is used, the
397 * data buffer can be padded so dlen might be larger
398 * than required. It must never be smaller.
400 if (dlen < XDR_QUADLEN(len)*4)
403 if (args->count > max_blocksize) {
404 args->count = max_blocksize;
405 len = args->len = max_blocksize;
407 rqstp->rq_vec[0].iov_base = (void*)p;
408 rqstp->rq_vec[0].iov_len = head->iov_len - hdr;
410 while (len > rqstp->rq_vec[v].iov_len) {
411 len -= rqstp->rq_vec[v].iov_len;
413 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
414 rqstp->rq_vec[v].iov_len = PAGE_SIZE;
416 rqstp->rq_vec[v].iov_len = len;
422 nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p)
424 struct nfsd3_createargs *args = rqstp->rq_argp;
426 if (!(p = decode_fh(p, &args->fh))
427 || !(p = decode_filename(p, &args->name, &args->len)))
430 switch (args->createmode = ntohl(*p++)) {
431 case NFS3_CREATE_UNCHECKED:
432 case NFS3_CREATE_GUARDED:
433 p = decode_sattr3(p, &args->attrs);
435 case NFS3_CREATE_EXCLUSIVE:
443 return xdr_argsize_check(rqstp, p);
447 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p)
449 struct nfsd3_createargs *args = rqstp->rq_argp;
451 if (!(p = decode_fh(p, &args->fh)) ||
452 !(p = decode_filename(p, &args->name, &args->len)))
454 p = decode_sattr3(p, &args->attrs);
456 return xdr_argsize_check(rqstp, p);
460 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p)
462 struct nfsd3_symlinkargs *args = rqstp->rq_argp;
463 unsigned int len, avail;
467 if (!(p = decode_fh(p, &args->ffh)) ||
468 !(p = decode_filename(p, &args->fname, &args->flen))
471 p = decode_sattr3(p, &args->attrs);
473 /* now decode the pathname, which might be larger than the first page.
474 * As we have to check for nul's anyway, we copy it into a new page
475 * This page appears in the rq_res.pages list, but as pages_len is always
476 * 0, it won't get in the way
479 if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE)
481 args->tname = new = page_address(*(rqstp->rq_next_page++));
483 /* first copy and check from the first page */
485 vec = &rqstp->rq_arg.head[0];
486 if ((void *)old > vec->iov_base + vec->iov_len)
488 avail = vec->iov_len - (old - (char*)vec->iov_base);
489 while (len && avail && *old) {
494 /* now copy next page if there is one */
495 if (len && !avail && rqstp->rq_arg.page_len) {
496 avail = min_t(unsigned int, rqstp->rq_arg.page_len, PAGE_SIZE);
497 old = page_address(rqstp->rq_arg.pages[0]);
499 while (len && avail && *old) {
512 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p)
514 struct nfsd3_mknodargs *args = rqstp->rq_argp;
516 if (!(p = decode_fh(p, &args->fh))
517 || !(p = decode_filename(p, &args->name, &args->len)))
520 args->ftype = ntohl(*p++);
522 if (args->ftype == NF3BLK || args->ftype == NF3CHR
523 || args->ftype == NF3SOCK || args->ftype == NF3FIFO)
524 p = decode_sattr3(p, &args->attrs);
526 if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
527 args->major = ntohl(*p++);
528 args->minor = ntohl(*p++);
531 return xdr_argsize_check(rqstp, p);
535 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p)
537 struct nfsd3_renameargs *args = rqstp->rq_argp;
539 if (!(p = decode_fh(p, &args->ffh))
540 || !(p = decode_filename(p, &args->fname, &args->flen))
541 || !(p = decode_fh(p, &args->tfh))
542 || !(p = decode_filename(p, &args->tname, &args->tlen)))
545 return xdr_argsize_check(rqstp, p);
549 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p)
551 struct nfsd3_readlinkargs *args = rqstp->rq_argp;
553 p = decode_fh(p, &args->fh);
556 args->buffer = page_address(*(rqstp->rq_next_page++));
558 return xdr_argsize_check(rqstp, p);
562 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p)
564 struct nfsd3_linkargs *args = rqstp->rq_argp;
566 if (!(p = decode_fh(p, &args->ffh))
567 || !(p = decode_fh(p, &args->tfh))
568 || !(p = decode_filename(p, &args->tname, &args->tlen)))
571 return xdr_argsize_check(rqstp, p);
575 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p)
577 struct nfsd3_readdirargs *args = rqstp->rq_argp;
578 p = decode_fh(p, &args->fh);
581 p = xdr_decode_hyper(p, &args->cookie);
582 args->verf = p; p += 2;
584 args->count = ntohl(*p++);
585 args->count = min_t(u32, args->count, PAGE_SIZE);
586 args->buffer = page_address(*(rqstp->rq_next_page++));
588 return xdr_argsize_check(rqstp, p);
592 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p)
594 struct nfsd3_readdirargs *args = rqstp->rq_argp;
596 u32 max_blocksize = svc_max_payload(rqstp);
598 p = decode_fh(p, &args->fh);
601 p = xdr_decode_hyper(p, &args->cookie);
602 args->verf = p; p += 2;
603 args->dircount = ntohl(*p++);
604 args->count = ntohl(*p++);
606 len = args->count = min(args->count, max_blocksize);
608 struct page *p = *(rqstp->rq_next_page++);
610 args->buffer = page_address(p);
614 return xdr_argsize_check(rqstp, p);
618 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p)
620 struct nfsd3_commitargs *args = rqstp->rq_argp;
621 p = decode_fh(p, &args->fh);
624 p = xdr_decode_hyper(p, &args->offset);
625 args->count = ntohl(*p++);
627 return xdr_argsize_check(rqstp, p);
631 * XDR encode functions
634 * There must be an encoding function for void results so svc_process
635 * will work properly.
638 nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
640 return xdr_ressize_check(rqstp, p);
645 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p)
647 struct nfsd3_attrstat *resp = rqstp->rq_resp;
649 if (resp->status == 0) {
650 lease_get_mtime(d_inode(resp->fh.fh_dentry),
652 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
654 return xdr_ressize_check(rqstp, p);
657 /* SETATTR, REMOVE, RMDIR */
659 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p)
661 struct nfsd3_attrstat *resp = rqstp->rq_resp;
663 p = encode_wcc_data(rqstp, p, &resp->fh);
664 return xdr_ressize_check(rqstp, p);
669 nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p)
671 struct nfsd3_diropres *resp = rqstp->rq_resp;
673 if (resp->status == 0) {
674 p = encode_fh(p, &resp->fh);
675 p = encode_post_op_attr(rqstp, p, &resp->fh);
677 p = encode_post_op_attr(rqstp, p, &resp->dirfh);
678 return xdr_ressize_check(rqstp, p);
683 nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p)
685 struct nfsd3_accessres *resp = rqstp->rq_resp;
687 p = encode_post_op_attr(rqstp, p, &resp->fh);
688 if (resp->status == 0)
689 *p++ = htonl(resp->access);
690 return xdr_ressize_check(rqstp, p);
695 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p)
697 struct nfsd3_readlinkres *resp = rqstp->rq_resp;
699 p = encode_post_op_attr(rqstp, p, &resp->fh);
700 if (resp->status == 0) {
701 *p++ = htonl(resp->len);
702 xdr_ressize_check(rqstp, p);
703 rqstp->rq_res.page_len = resp->len;
705 /* need to pad the tail */
706 rqstp->rq_res.tail[0].iov_base = p;
708 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
712 return xdr_ressize_check(rqstp, p);
717 nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p)
719 struct nfsd3_readres *resp = rqstp->rq_resp;
721 p = encode_post_op_attr(rqstp, p, &resp->fh);
722 if (resp->status == 0) {
723 *p++ = htonl(resp->count);
724 *p++ = htonl(resp->eof);
725 *p++ = htonl(resp->count); /* xdr opaque count */
726 xdr_ressize_check(rqstp, p);
727 /* now update rqstp->rq_res to reflect data as well */
728 rqstp->rq_res.page_len = resp->count;
729 if (resp->count & 3) {
730 /* need to pad the tail */
731 rqstp->rq_res.tail[0].iov_base = p;
733 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
737 return xdr_ressize_check(rqstp, p);
742 nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p)
744 struct nfsd3_writeres *resp = rqstp->rq_resp;
745 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
747 p = encode_wcc_data(rqstp, p, &resp->fh);
748 if (resp->status == 0) {
749 *p++ = htonl(resp->count);
750 *p++ = htonl(resp->committed);
751 *p++ = htonl(nn->nfssvc_boot.tv_sec);
752 *p++ = htonl(nn->nfssvc_boot.tv_usec);
754 return xdr_ressize_check(rqstp, p);
757 /* CREATE, MKDIR, SYMLINK, MKNOD */
759 nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p)
761 struct nfsd3_diropres *resp = rqstp->rq_resp;
763 if (resp->status == 0) {
765 p = encode_fh(p, &resp->fh);
766 p = encode_post_op_attr(rqstp, p, &resp->fh);
768 p = encode_wcc_data(rqstp, p, &resp->dirfh);
769 return xdr_ressize_check(rqstp, p);
774 nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p)
776 struct nfsd3_renameres *resp = rqstp->rq_resp;
778 p = encode_wcc_data(rqstp, p, &resp->ffh);
779 p = encode_wcc_data(rqstp, p, &resp->tfh);
780 return xdr_ressize_check(rqstp, p);
785 nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p)
787 struct nfsd3_linkres *resp = rqstp->rq_resp;
789 p = encode_post_op_attr(rqstp, p, &resp->fh);
790 p = encode_wcc_data(rqstp, p, &resp->tfh);
791 return xdr_ressize_check(rqstp, p);
796 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p)
798 struct nfsd3_readdirres *resp = rqstp->rq_resp;
800 p = encode_post_op_attr(rqstp, p, &resp->fh);
802 if (resp->status == 0) {
803 /* stupid readdir cookie */
804 memcpy(p, resp->verf, 8); p += 2;
805 xdr_ressize_check(rqstp, p);
806 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
807 return 1; /*No room for trailer */
808 rqstp->rq_res.page_len = (resp->count) << 2;
810 /* add the 'tail' to the end of the 'head' page - page 0. */
811 rqstp->rq_res.tail[0].iov_base = p;
812 *p++ = 0; /* no more entries */
813 *p++ = htonl(resp->common.err == nfserr_eof);
814 rqstp->rq_res.tail[0].iov_len = 2<<2;
817 return xdr_ressize_check(rqstp, p);
821 encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
824 *p++ = xdr_one; /* mark entry present */
825 p = xdr_encode_hyper(p, ino); /* file id */
826 p = xdr_encode_array(p, name, namlen);/* name length & name */
828 cd->offset = p; /* remember pointer */
829 p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
835 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
836 const char *name, int namlen, u64 ino)
838 struct svc_export *exp;
839 struct dentry *dparent, *dchild;
840 __be32 rv = nfserr_noent;
842 dparent = cd->fh.fh_dentry;
843 exp = cd->fh.fh_export;
845 if (isdotent(name, namlen)) {
847 dchild = dget_parent(dparent);
849 * Don't return filehandle for ".." if we're at
850 * the filesystem or export root:
852 if (dchild == dparent)
854 if (dparent == exp->ex_path.dentry)
857 dchild = dget(dparent);
859 dchild = lookup_one_len_unlocked(name, dparent, namlen);
862 if (d_mountpoint(dchild))
864 if (d_really_is_negative(dchild))
866 if (dchild->d_inode->i_ino != ino)
868 rv = fh_compose(fhp, exp, dchild, &cd->fh);
874 static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen, u64 ino)
876 struct svc_fh *fh = &cd->scratch;
879 fh_init(fh, NFS3_FHSIZE);
880 err = compose_entry_fh(cd, fh, name, namlen, ino);
886 p = encode_post_op_attr(cd->rqstp, p, fh);
887 *p++ = xdr_one; /* yes, a file handle follows */
888 p = encode_fh(p, fh);
895 * Encode a directory entry. This one works for both normal readdir
897 * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
898 * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
900 * The readdirplus baggage is 1+21 words for post_op_attr, plus the
904 #define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1)
905 #define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
907 encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
908 loff_t offset, u64 ino, unsigned int d_type, int plus)
910 struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
912 __be32 *p = cd->buffer;
913 caddr_t curr_page_addr = NULL;
915 int slen; /* string (name) length */
916 int elen; /* estimated entry length in words */
917 int num_entry_words = 0; /* actual number of words */
920 u64 offset64 = offset;
922 if (unlikely(cd->offset1)) {
923 /* we ended up with offset on a page boundary */
924 *cd->offset = htonl(offset64 >> 32);
925 *cd->offset1 = htonl(offset64 & 0xffffffff);
928 xdr_encode_hyper(cd->offset, offset64);
934 dprintk("encode_entry(%.*s @%ld%s)\n",
935 namlen, name, (long) offset, plus? " plus" : "");
938 /* truncate filename if too long */
939 namlen = min(namlen, NFS3_MAXNAMLEN);
941 slen = XDR_QUADLEN(namlen);
942 elen = slen + NFS3_ENTRY_BAGGAGE
943 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
945 if (cd->buflen < elen) {
946 cd->common.err = nfserr_toosmall;
950 /* determine which page in rq_respages[] we are currently filling */
951 for (page = cd->rqstp->rq_respages + 1;
952 page < cd->rqstp->rq_next_page; page++) {
953 curr_page_addr = page_address(*page);
955 if (((caddr_t)cd->buffer >= curr_page_addr) &&
956 ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE))
960 if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
961 /* encode entry in current page */
963 p = encode_entry_baggage(cd, p, name, namlen, ino);
966 p = encode_entryplus_baggage(cd, p, name, namlen, ino);
967 num_entry_words = p - cd->buffer;
968 } else if (*(page+1) != NULL) {
969 /* temporarily encode entry into next page, then move back to
970 * current and next page in rq_respages[] */
974 /* grab next page for temporary storage of entry */
975 p1 = tmp = page_address(*(page+1));
977 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
980 p1 = encode_entryplus_baggage(cd, p1, name, namlen, ino);
982 /* determine entry word length and lengths to go in pages */
983 num_entry_words = p1 - tmp;
984 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
985 if ((num_entry_words << 2) < len1) {
986 /* the actual number of words in the entry is less
987 * than elen and can still fit in the current page
989 memmove(p, tmp, num_entry_words << 2);
990 p += num_entry_words;
993 cd->offset = cd->buffer + (cd->offset - tmp);
995 unsigned int offset_r = (cd->offset - tmp) << 2;
997 /* update pointer to offset location.
998 * This is a 64bit quantity, so we need to
1000 * - entirely in first page
1001 * - entirely in second page
1002 * - 4 bytes in each page
1004 if (offset_r + 8 <= len1) {
1005 cd->offset = p + (cd->offset - tmp);
1006 } else if (offset_r >= len1) {
1007 cd->offset -= len1 >> 2;
1009 /* sitting on the fence */
1010 BUG_ON(offset_r != len1 - 4);
1011 cd->offset = p + (cd->offset - tmp);
1015 len2 = (num_entry_words << 2) - len1;
1017 /* move from temp page to current and next pages */
1018 memmove(p, tmp, len1);
1019 memmove(tmp, (caddr_t)tmp+len1, len2);
1021 p = tmp + (len2 >> 2);
1025 cd->common.err = nfserr_toosmall;
1029 cd->buflen -= num_entry_words;
1031 cd->common.err = nfs_ok;
1037 nfs3svc_encode_entry(void *cd, const char *name,
1038 int namlen, loff_t offset, u64 ino, unsigned int d_type)
1040 return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
1044 nfs3svc_encode_entry_plus(void *cd, const char *name,
1045 int namlen, loff_t offset, u64 ino,
1046 unsigned int d_type)
1048 return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1053 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p)
1055 struct nfsd3_fsstatres *resp = rqstp->rq_resp;
1056 struct kstatfs *s = &resp->stats;
1057 u64 bs = s->f_bsize;
1059 *p++ = xdr_zero; /* no post_op_attr */
1061 if (resp->status == 0) {
1062 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */
1063 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */
1064 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */
1065 p = xdr_encode_hyper(p, s->f_files); /* total inodes */
1066 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */
1067 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */
1068 *p++ = htonl(resp->invarsec); /* mean unchanged time */
1070 return xdr_ressize_check(rqstp, p);
1075 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p)
1077 struct nfsd3_fsinfores *resp = rqstp->rq_resp;
1079 *p++ = xdr_zero; /* no post_op_attr */
1081 if (resp->status == 0) {
1082 *p++ = htonl(resp->f_rtmax);
1083 *p++ = htonl(resp->f_rtpref);
1084 *p++ = htonl(resp->f_rtmult);
1085 *p++ = htonl(resp->f_wtmax);
1086 *p++ = htonl(resp->f_wtpref);
1087 *p++ = htonl(resp->f_wtmult);
1088 *p++ = htonl(resp->f_dtpref);
1089 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1092 *p++ = htonl(resp->f_properties);
1095 return xdr_ressize_check(rqstp, p);
1100 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p)
1102 struct nfsd3_pathconfres *resp = rqstp->rq_resp;
1104 *p++ = xdr_zero; /* no post_op_attr */
1106 if (resp->status == 0) {
1107 *p++ = htonl(resp->p_link_max);
1108 *p++ = htonl(resp->p_name_max);
1109 *p++ = htonl(resp->p_no_trunc);
1110 *p++ = htonl(resp->p_chown_restricted);
1111 *p++ = htonl(resp->p_case_insensitive);
1112 *p++ = htonl(resp->p_case_preserving);
1115 return xdr_ressize_check(rqstp, p);
1120 nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p)
1122 struct nfsd3_commitres *resp = rqstp->rq_resp;
1123 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1125 p = encode_wcc_data(rqstp, p, &resp->fh);
1126 /* Write verifier */
1127 if (resp->status == 0) {
1128 *p++ = htonl(nn->nfssvc_boot.tv_sec);
1129 *p++ = htonl(nn->nfssvc_boot.tv_usec);
1131 return xdr_ressize_check(rqstp, p);
1135 * XDR release functions
1138 nfs3svc_release_fhandle(struct svc_rqst *rqstp)
1140 struct nfsd3_attrstat *resp = rqstp->rq_resp;
1146 nfs3svc_release_fhandle2(struct svc_rqst *rqstp)
1148 struct nfsd3_fhandle_pair *resp = rqstp->rq_resp;