1 // SPDX-License-Identifier: GPL-2.0
3 * XDR support for nfsd/protocol version 3.
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,
169 *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
170 *p++ = htonl((u32) (stat->mode & S_IALLUGO));
171 *p++ = htonl((u32) stat->nlink);
172 *p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
173 *p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid));
174 if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) {
175 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
177 p = xdr_encode_hyper(p, (u64) stat->size);
179 p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
180 *p++ = htonl((u32) MAJOR(stat->rdev));
181 *p++ = htonl((u32) MINOR(stat->rdev));
182 p = encode_fsid(p, fhp);
183 p = xdr_encode_hyper(p, stat->ino);
184 ts = timespec64_to_timespec(stat->atime);
185 p = encode_time3(p, &ts);
186 ts = timespec64_to_timespec(stat->mtime);
187 p = encode_time3(p, &ts);
188 ts = timespec64_to_timespec(stat->ctime);
189 p = encode_time3(p, &ts);
195 encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
197 /* Attributes to follow */
199 return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr);
203 * Encode post-operation attributes.
204 * The inode may be NULL if the call failed because of a stale file
205 * handle. In this case, no attributes are returned.
208 encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
210 struct dentry *dentry = fhp->fh_dentry;
211 if (dentry && d_really_is_positive(dentry)) {
215 err = fh_getattr(fhp, &stat);
217 *p++ = xdr_one; /* attributes follow */
218 lease_get_mtime(d_inode(dentry), &stat.mtime);
219 return encode_fattr3(rqstp, p, fhp, &stat);
226 /* Helper for NFSv3 ACLs */
228 nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
230 return encode_post_op_attr(rqstp, p, fhp);
234 * Enocde weak cache consistency data
237 encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
239 struct dentry *dentry = fhp->fh_dentry;
241 if (dentry && d_really_is_positive(dentry) && fhp->fh_post_saved) {
242 if (fhp->fh_pre_saved) {
244 p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
245 p = encode_time3(p, &fhp->fh_pre_mtime);
246 p = encode_time3(p, &fhp->fh_pre_ctime);
250 return encode_saved_post_attr(rqstp, p, fhp);
252 /* no pre- or post-attrs */
254 return encode_post_op_attr(rqstp, p, fhp);
258 * Fill in the pre_op attr for the wcc data
260 void fill_pre_wcc(struct svc_fh *fhp)
266 if (fhp->fh_pre_saved)
269 inode = d_inode(fhp->fh_dentry);
270 err = fh_getattr(fhp, &stat);
272 /* Grab the times from inode anyway */
273 stat.mtime = inode->i_mtime;
274 stat.ctime = inode->i_ctime;
275 stat.size = inode->i_size;
278 fhp->fh_pre_mtime = timespec64_to_timespec(stat.mtime);
279 fhp->fh_pre_ctime = timespec64_to_timespec(stat.ctime);
280 fhp->fh_pre_size = stat.size;
281 fhp->fh_pre_change = nfsd4_change_attribute(&stat, inode);
282 fhp->fh_pre_saved = true;
286 * Fill in the post_op attr for the wcc data
288 void fill_post_wcc(struct svc_fh *fhp)
292 if (fhp->fh_post_saved)
293 printk("nfsd: inode locked twice during operation.\n");
295 err = fh_getattr(fhp, &fhp->fh_post_attr);
296 fhp->fh_post_change = nfsd4_change_attribute(&fhp->fh_post_attr,
297 d_inode(fhp->fh_dentry));
299 fhp->fh_post_saved = false;
300 /* Grab the ctime anyway - set_change_info might use it */
301 fhp->fh_post_attr.ctime = d_inode(fhp->fh_dentry)->i_ctime;
303 fhp->fh_post_saved = true;
307 * XDR decode functions
310 nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p)
312 struct nfsd_fhandle *args = rqstp->rq_argp;
314 p = decode_fh(p, &args->fh);
317 return xdr_argsize_check(rqstp, p);
321 nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p)
323 struct nfsd3_sattrargs *args = rqstp->rq_argp;
325 p = decode_fh(p, &args->fh);
328 p = decode_sattr3(p, &args->attrs);
330 if ((args->check_guard = ntohl(*p++)) != 0) {
331 struct timespec time;
332 p = decode_time3(p, &time);
333 args->guardtime = time.tv_sec;
336 return xdr_argsize_check(rqstp, p);
340 nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p)
342 struct nfsd3_diropargs *args = rqstp->rq_argp;
344 if (!(p = decode_fh(p, &args->fh))
345 || !(p = decode_filename(p, &args->name, &args->len)))
348 return xdr_argsize_check(rqstp, p);
352 nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p)
354 struct nfsd3_accessargs *args = rqstp->rq_argp;
356 p = decode_fh(p, &args->fh);
359 args->access = ntohl(*p++);
361 return xdr_argsize_check(rqstp, p);
365 nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p)
367 struct nfsd3_readargs *args = rqstp->rq_argp;
370 u32 max_blocksize = svc_max_payload(rqstp);
372 p = decode_fh(p, &args->fh);
375 p = xdr_decode_hyper(p, &args->offset);
377 args->count = ntohl(*p++);
378 len = min(args->count, max_blocksize);
380 /* set up the kvec */
383 struct page *p = *(rqstp->rq_next_page++);
385 rqstp->rq_vec[v].iov_base = page_address(p);
386 rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
387 len -= rqstp->rq_vec[v].iov_len;
391 return xdr_argsize_check(rqstp, p);
395 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p)
397 struct nfsd3_writeargs *args = rqstp->rq_argp;
398 unsigned int len, hdr, dlen;
399 u32 max_blocksize = svc_max_payload(rqstp);
400 struct kvec *head = rqstp->rq_arg.head;
401 struct kvec *tail = rqstp->rq_arg.tail;
403 p = decode_fh(p, &args->fh);
406 p = xdr_decode_hyper(p, &args->offset);
408 args->count = ntohl(*p++);
409 args->stable = ntohl(*p++);
410 len = args->len = ntohl(*p++);
411 if ((void *)p > head->iov_base + head->iov_len)
414 * The count must equal the amount of data passed.
416 if (args->count != args->len)
420 * Check to make sure that we got the right number of
423 hdr = (void*)p - head->iov_base;
424 dlen = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len - hdr;
426 * Round the length of the data which was specified up to
427 * the next multiple of XDR units and then compare that
428 * against the length which was actually received.
429 * Note that when RPCSEC/GSS (for example) is used, the
430 * data buffer can be padded so dlen might be larger
431 * than required. It must never be smaller.
433 if (dlen < XDR_QUADLEN(len)*4)
436 if (args->count > max_blocksize) {
437 args->count = max_blocksize;
438 len = args->len = max_blocksize;
441 args->first.iov_base = (void *)p;
442 args->first.iov_len = head->iov_len - hdr;
447 nfs3svc_decode_createargs(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)))
455 switch (args->createmode = ntohl(*p++)) {
456 case NFS3_CREATE_UNCHECKED:
457 case NFS3_CREATE_GUARDED:
458 p = decode_sattr3(p, &args->attrs);
460 case NFS3_CREATE_EXCLUSIVE:
468 return xdr_argsize_check(rqstp, p);
472 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p)
474 struct nfsd3_createargs *args = rqstp->rq_argp;
476 if (!(p = decode_fh(p, &args->fh)) ||
477 !(p = decode_filename(p, &args->name, &args->len)))
479 p = decode_sattr3(p, &args->attrs);
481 return xdr_argsize_check(rqstp, p);
485 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p)
487 struct nfsd3_symlinkargs *args = rqstp->rq_argp;
488 char *base = (char *)p;
491 if (!(p = decode_fh(p, &args->ffh)) ||
492 !(p = decode_filename(p, &args->fname, &args->flen)))
494 p = decode_sattr3(p, &args->attrs);
496 args->tlen = ntohl(*p++);
498 args->first.iov_base = p;
499 args->first.iov_len = rqstp->rq_arg.head[0].iov_len;
500 args->first.iov_len -= (char *)p - base;
502 dlen = args->first.iov_len + rqstp->rq_arg.page_len +
503 rqstp->rq_arg.tail[0].iov_len;
504 if (dlen < XDR_QUADLEN(args->tlen) << 2)
510 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p)
512 struct nfsd3_mknodargs *args = rqstp->rq_argp;
514 if (!(p = decode_fh(p, &args->fh))
515 || !(p = decode_filename(p, &args->name, &args->len)))
518 args->ftype = ntohl(*p++);
520 if (args->ftype == NF3BLK || args->ftype == NF3CHR
521 || args->ftype == NF3SOCK || args->ftype == NF3FIFO)
522 p = decode_sattr3(p, &args->attrs);
524 if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
525 args->major = ntohl(*p++);
526 args->minor = ntohl(*p++);
529 return xdr_argsize_check(rqstp, p);
533 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p)
535 struct nfsd3_renameargs *args = rqstp->rq_argp;
537 if (!(p = decode_fh(p, &args->ffh))
538 || !(p = decode_filename(p, &args->fname, &args->flen))
539 || !(p = decode_fh(p, &args->tfh))
540 || !(p = decode_filename(p, &args->tname, &args->tlen)))
543 return xdr_argsize_check(rqstp, p);
547 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p)
549 struct nfsd3_readlinkargs *args = rqstp->rq_argp;
551 p = decode_fh(p, &args->fh);
554 args->buffer = page_address(*(rqstp->rq_next_page++));
556 return xdr_argsize_check(rqstp, p);
560 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p)
562 struct nfsd3_linkargs *args = rqstp->rq_argp;
564 if (!(p = decode_fh(p, &args->ffh))
565 || !(p = decode_fh(p, &args->tfh))
566 || !(p = decode_filename(p, &args->tname, &args->tlen)))
569 return xdr_argsize_check(rqstp, p);
573 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p)
575 struct nfsd3_readdirargs *args = rqstp->rq_argp;
577 u32 max_blocksize = svc_max_payload(rqstp);
579 p = decode_fh(p, &args->fh);
582 p = xdr_decode_hyper(p, &args->cookie);
583 args->verf = p; p += 2;
585 args->count = ntohl(*p++);
586 len = args->count = min_t(u32, args->count, max_blocksize);
589 struct page *p = *(rqstp->rq_next_page++);
591 args->buffer = page_address(p);
595 return xdr_argsize_check(rqstp, p);
599 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p)
601 struct nfsd3_readdirargs *args = rqstp->rq_argp;
603 u32 max_blocksize = svc_max_payload(rqstp);
605 p = decode_fh(p, &args->fh);
608 p = xdr_decode_hyper(p, &args->cookie);
609 args->verf = p; p += 2;
610 args->dircount = ntohl(*p++);
611 args->count = ntohl(*p++);
613 len = args->count = min(args->count, max_blocksize);
615 struct page *p = *(rqstp->rq_next_page++);
617 args->buffer = page_address(p);
621 return xdr_argsize_check(rqstp, p);
625 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p)
627 struct nfsd3_commitargs *args = rqstp->rq_argp;
628 p = decode_fh(p, &args->fh);
631 p = xdr_decode_hyper(p, &args->offset);
632 args->count = ntohl(*p++);
634 return xdr_argsize_check(rqstp, p);
638 * XDR encode functions
641 * There must be an encoding function for void results so svc_process
642 * will work properly.
645 nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
647 return xdr_ressize_check(rqstp, p);
652 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p)
654 struct nfsd3_attrstat *resp = rqstp->rq_resp;
656 if (resp->status == 0) {
657 lease_get_mtime(d_inode(resp->fh.fh_dentry),
659 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
661 return xdr_ressize_check(rqstp, p);
664 /* SETATTR, REMOVE, RMDIR */
666 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p)
668 struct nfsd3_attrstat *resp = rqstp->rq_resp;
670 p = encode_wcc_data(rqstp, p, &resp->fh);
671 return xdr_ressize_check(rqstp, p);
676 nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p)
678 struct nfsd3_diropres *resp = rqstp->rq_resp;
680 if (resp->status == 0) {
681 p = encode_fh(p, &resp->fh);
682 p = encode_post_op_attr(rqstp, p, &resp->fh);
684 p = encode_post_op_attr(rqstp, p, &resp->dirfh);
685 return xdr_ressize_check(rqstp, p);
690 nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p)
692 struct nfsd3_accessres *resp = rqstp->rq_resp;
694 p = encode_post_op_attr(rqstp, p, &resp->fh);
695 if (resp->status == 0)
696 *p++ = htonl(resp->access);
697 return xdr_ressize_check(rqstp, p);
702 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p)
704 struct nfsd3_readlinkres *resp = rqstp->rq_resp;
706 p = encode_post_op_attr(rqstp, p, &resp->fh);
707 if (resp->status == 0) {
708 *p++ = htonl(resp->len);
709 xdr_ressize_check(rqstp, p);
710 rqstp->rq_res.page_len = resp->len;
712 /* need to pad the tail */
713 rqstp->rq_res.tail[0].iov_base = p;
715 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
719 return xdr_ressize_check(rqstp, p);
724 nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p)
726 struct nfsd3_readres *resp = rqstp->rq_resp;
728 p = encode_post_op_attr(rqstp, p, &resp->fh);
729 if (resp->status == 0) {
730 *p++ = htonl(resp->count);
731 *p++ = htonl(resp->eof);
732 *p++ = htonl(resp->count); /* xdr opaque count */
733 xdr_ressize_check(rqstp, p);
734 /* now update rqstp->rq_res to reflect data as well */
735 rqstp->rq_res.page_len = resp->count;
736 if (resp->count & 3) {
737 /* need to pad the tail */
738 rqstp->rq_res.tail[0].iov_base = p;
740 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
744 return xdr_ressize_check(rqstp, p);
749 nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p)
751 struct nfsd3_writeres *resp = rqstp->rq_resp;
752 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
754 p = encode_wcc_data(rqstp, p, &resp->fh);
755 if (resp->status == 0) {
756 *p++ = htonl(resp->count);
757 *p++ = htonl(resp->committed);
758 /* unique identifier, y2038 overflow can be ignored */
759 *p++ = htonl((u32)nn->nfssvc_boot.tv_sec);
760 *p++ = htonl(nn->nfssvc_boot.tv_nsec);
762 return xdr_ressize_check(rqstp, p);
765 /* CREATE, MKDIR, SYMLINK, MKNOD */
767 nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p)
769 struct nfsd3_diropres *resp = rqstp->rq_resp;
771 if (resp->status == 0) {
773 p = encode_fh(p, &resp->fh);
774 p = encode_post_op_attr(rqstp, p, &resp->fh);
776 p = encode_wcc_data(rqstp, p, &resp->dirfh);
777 return xdr_ressize_check(rqstp, p);
782 nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p)
784 struct nfsd3_renameres *resp = rqstp->rq_resp;
786 p = encode_wcc_data(rqstp, p, &resp->ffh);
787 p = encode_wcc_data(rqstp, p, &resp->tfh);
788 return xdr_ressize_check(rqstp, p);
793 nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p)
795 struct nfsd3_linkres *resp = rqstp->rq_resp;
797 p = encode_post_op_attr(rqstp, p, &resp->fh);
798 p = encode_wcc_data(rqstp, p, &resp->tfh);
799 return xdr_ressize_check(rqstp, p);
804 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p)
806 struct nfsd3_readdirres *resp = rqstp->rq_resp;
808 p = encode_post_op_attr(rqstp, p, &resp->fh);
810 if (resp->status == 0) {
811 /* stupid readdir cookie */
812 memcpy(p, resp->verf, 8); p += 2;
813 xdr_ressize_check(rqstp, p);
814 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
815 return 1; /*No room for trailer */
816 rqstp->rq_res.page_len = (resp->count) << 2;
818 /* add the 'tail' to the end of the 'head' page - page 0. */
819 rqstp->rq_res.tail[0].iov_base = p;
820 *p++ = 0; /* no more entries */
821 *p++ = htonl(resp->common.err == nfserr_eof);
822 rqstp->rq_res.tail[0].iov_len = 2<<2;
825 return xdr_ressize_check(rqstp, p);
829 encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
832 *p++ = xdr_one; /* mark entry present */
833 p = xdr_encode_hyper(p, ino); /* file id */
834 p = xdr_encode_array(p, name, namlen);/* name length & name */
836 cd->offset = p; /* remember pointer */
837 p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
843 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
844 const char *name, int namlen, u64 ino)
846 struct svc_export *exp;
847 struct dentry *dparent, *dchild;
848 __be32 rv = nfserr_noent;
850 dparent = cd->fh.fh_dentry;
851 exp = cd->fh.fh_export;
853 if (isdotent(name, namlen)) {
855 dchild = dget_parent(dparent);
856 /* filesystem root - cannot return filehandle for ".." */
857 if (dchild == dparent)
860 dchild = dget(dparent);
862 dchild = lookup_one_len_unlocked(name, dparent, namlen);
865 if (d_mountpoint(dchild))
867 if (d_really_is_negative(dchild))
869 if (dchild->d_inode->i_ino != ino)
871 rv = fh_compose(fhp, exp, dchild, &cd->fh);
877 static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen, u64 ino)
879 struct svc_fh *fh = &cd->scratch;
882 fh_init(fh, NFS3_FHSIZE);
883 err = compose_entry_fh(cd, fh, name, namlen, ino);
889 p = encode_post_op_attr(cd->rqstp, p, fh);
890 *p++ = xdr_one; /* yes, a file handle follows */
891 p = encode_fh(p, fh);
898 * Encode a directory entry. This one works for both normal readdir
900 * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
901 * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
903 * The readdirplus baggage is 1+21 words for post_op_attr, plus the
907 #define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1)
908 #define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
910 encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
911 loff_t offset, u64 ino, unsigned int d_type, int plus)
913 struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
915 __be32 *p = cd->buffer;
916 caddr_t curr_page_addr = NULL;
918 int slen; /* string (name) length */
919 int elen; /* estimated entry length in words */
920 int num_entry_words = 0; /* actual number of words */
923 u64 offset64 = offset;
925 if (unlikely(cd->offset1)) {
926 /* we ended up with offset on a page boundary */
927 *cd->offset = htonl(offset64 >> 32);
928 *cd->offset1 = htonl(offset64 & 0xffffffff);
931 xdr_encode_hyper(cd->offset, offset64);
937 dprintk("encode_entry(%.*s @%ld%s)\n",
938 namlen, name, (long) offset, plus? " plus" : "");
941 /* truncate filename if too long */
942 namlen = min(namlen, NFS3_MAXNAMLEN);
944 slen = XDR_QUADLEN(namlen);
945 elen = slen + NFS3_ENTRY_BAGGAGE
946 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
948 if (cd->buflen < elen) {
949 cd->common.err = nfserr_toosmall;
953 /* determine which page in rq_respages[] we are currently filling */
954 for (page = cd->rqstp->rq_respages + 1;
955 page < cd->rqstp->rq_next_page; page++) {
956 curr_page_addr = page_address(*page);
958 if (((caddr_t)cd->buffer >= curr_page_addr) &&
959 ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE))
963 if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
964 /* encode entry in current page */
966 p = encode_entry_baggage(cd, p, name, namlen, ino);
969 p = encode_entryplus_baggage(cd, p, name, namlen, ino);
970 num_entry_words = p - cd->buffer;
971 } else if (*(page+1) != NULL) {
972 /* temporarily encode entry into next page, then move back to
973 * current and next page in rq_respages[] */
977 /* grab next page for temporary storage of entry */
978 p1 = tmp = page_address(*(page+1));
980 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
983 p1 = encode_entryplus_baggage(cd, p1, name, namlen, ino);
985 /* determine entry word length and lengths to go in pages */
986 num_entry_words = p1 - tmp;
987 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
988 if ((num_entry_words << 2) < len1) {
989 /* the actual number of words in the entry is less
990 * than elen and can still fit in the current page
992 memmove(p, tmp, num_entry_words << 2);
993 p += num_entry_words;
996 cd->offset = cd->buffer + (cd->offset - tmp);
998 unsigned int offset_r = (cd->offset - tmp) << 2;
1000 /* update pointer to offset location.
1001 * This is a 64bit quantity, so we need to
1002 * deal with 3 cases:
1003 * - entirely in first page
1004 * - entirely in second page
1005 * - 4 bytes in each page
1007 if (offset_r + 8 <= len1) {
1008 cd->offset = p + (cd->offset - tmp);
1009 } else if (offset_r >= len1) {
1010 cd->offset -= len1 >> 2;
1012 /* sitting on the fence */
1013 BUG_ON(offset_r != len1 - 4);
1014 cd->offset = p + (cd->offset - tmp);
1018 len2 = (num_entry_words << 2) - len1;
1020 /* move from temp page to current and next pages */
1021 memmove(p, tmp, len1);
1022 memmove(tmp, (caddr_t)tmp+len1, len2);
1024 p = tmp + (len2 >> 2);
1028 cd->common.err = nfserr_toosmall;
1032 cd->buflen -= num_entry_words;
1034 cd->common.err = nfs_ok;
1040 nfs3svc_encode_entry(void *cd, const char *name,
1041 int namlen, loff_t offset, u64 ino, unsigned int d_type)
1043 return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
1047 nfs3svc_encode_entry_plus(void *cd, const char *name,
1048 int namlen, loff_t offset, u64 ino,
1049 unsigned int d_type)
1051 return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1056 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p)
1058 struct nfsd3_fsstatres *resp = rqstp->rq_resp;
1059 struct kstatfs *s = &resp->stats;
1060 u64 bs = s->f_bsize;
1062 *p++ = xdr_zero; /* no post_op_attr */
1064 if (resp->status == 0) {
1065 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */
1066 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */
1067 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */
1068 p = xdr_encode_hyper(p, s->f_files); /* total inodes */
1069 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */
1070 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */
1071 *p++ = htonl(resp->invarsec); /* mean unchanged time */
1073 return xdr_ressize_check(rqstp, p);
1078 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p)
1080 struct nfsd3_fsinfores *resp = rqstp->rq_resp;
1082 *p++ = xdr_zero; /* no post_op_attr */
1084 if (resp->status == 0) {
1085 *p++ = htonl(resp->f_rtmax);
1086 *p++ = htonl(resp->f_rtpref);
1087 *p++ = htonl(resp->f_rtmult);
1088 *p++ = htonl(resp->f_wtmax);
1089 *p++ = htonl(resp->f_wtpref);
1090 *p++ = htonl(resp->f_wtmult);
1091 *p++ = htonl(resp->f_dtpref);
1092 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1095 *p++ = htonl(resp->f_properties);
1098 return xdr_ressize_check(rqstp, p);
1103 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p)
1105 struct nfsd3_pathconfres *resp = rqstp->rq_resp;
1107 *p++ = xdr_zero; /* no post_op_attr */
1109 if (resp->status == 0) {
1110 *p++ = htonl(resp->p_link_max);
1111 *p++ = htonl(resp->p_name_max);
1112 *p++ = htonl(resp->p_no_trunc);
1113 *p++ = htonl(resp->p_chown_restricted);
1114 *p++ = htonl(resp->p_case_insensitive);
1115 *p++ = htonl(resp->p_case_preserving);
1118 return xdr_ressize_check(rqstp, p);
1123 nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p)
1125 struct nfsd3_commitres *resp = rqstp->rq_resp;
1126 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1128 p = encode_wcc_data(rqstp, p, &resp->fh);
1129 /* Write verifier */
1130 if (resp->status == 0) {
1131 /* unique identifier, y2038 overflow can be ignored */
1132 *p++ = htonl((u32)nn->nfssvc_boot.tv_sec);
1133 *p++ = htonl(nn->nfssvc_boot.tv_nsec);
1135 return xdr_ressize_check(rqstp, p);
1139 * XDR release functions
1142 nfs3svc_release_fhandle(struct svc_rqst *rqstp)
1144 struct nfsd3_attrstat *resp = rqstp->rq_resp;
1150 nfs3svc_release_fhandle2(struct svc_rqst *rqstp)
1152 struct nfsd3_fhandle_pair *resp = rqstp->rq_resp;