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,
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 pre_op attr for the wcc data
256 void fill_pre_wcc(struct svc_fh *fhp)
262 if (fhp->fh_pre_saved)
265 inode = d_inode(fhp->fh_dentry);
266 err = fh_getattr(fhp, &stat);
268 /* Grab the times from inode anyway */
269 stat.mtime = inode->i_mtime;
270 stat.ctime = inode->i_ctime;
271 stat.size = inode->i_size;
274 fhp->fh_pre_mtime = stat.mtime;
275 fhp->fh_pre_ctime = stat.ctime;
276 fhp->fh_pre_size = stat.size;
277 fhp->fh_pre_change = nfsd4_change_attribute(&stat, inode);
278 fhp->fh_pre_saved = true;
282 * Fill in the post_op attr for the wcc data
284 void fill_post_wcc(struct svc_fh *fhp)
288 if (fhp->fh_post_saved)
289 printk("nfsd: inode locked twice during operation.\n");
291 err = fh_getattr(fhp, &fhp->fh_post_attr);
292 fhp->fh_post_change = nfsd4_change_attribute(&fhp->fh_post_attr,
293 d_inode(fhp->fh_dentry));
295 fhp->fh_post_saved = false;
296 /* Grab the ctime anyway - set_change_info might use it */
297 fhp->fh_post_attr.ctime = d_inode(fhp->fh_dentry)->i_ctime;
299 fhp->fh_post_saved = true;
303 * XDR decode functions
306 nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p)
308 struct nfsd_fhandle *args = rqstp->rq_argp;
310 p = decode_fh(p, &args->fh);
313 return xdr_argsize_check(rqstp, p);
317 nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p)
319 struct nfsd3_sattrargs *args = rqstp->rq_argp;
321 p = decode_fh(p, &args->fh);
324 p = decode_sattr3(p, &args->attrs);
326 if ((args->check_guard = ntohl(*p++)) != 0) {
327 struct timespec time;
328 p = decode_time3(p, &time);
329 args->guardtime = time.tv_sec;
332 return xdr_argsize_check(rqstp, p);
336 nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p)
338 struct nfsd3_diropargs *args = rqstp->rq_argp;
340 if (!(p = decode_fh(p, &args->fh))
341 || !(p = decode_filename(p, &args->name, &args->len)))
344 return xdr_argsize_check(rqstp, p);
348 nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p)
350 struct nfsd3_accessargs *args = rqstp->rq_argp;
352 p = decode_fh(p, &args->fh);
355 args->access = ntohl(*p++);
357 return xdr_argsize_check(rqstp, p);
361 nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p)
363 struct nfsd3_readargs *args = rqstp->rq_argp;
366 u32 max_blocksize = svc_max_payload(rqstp);
368 p = decode_fh(p, &args->fh);
371 p = xdr_decode_hyper(p, &args->offset);
373 args->count = ntohl(*p++);
374 len = min(args->count, max_blocksize);
376 /* set up the kvec */
379 struct page *p = *(rqstp->rq_next_page++);
381 rqstp->rq_vec[v].iov_base = page_address(p);
382 rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
383 len -= rqstp->rq_vec[v].iov_len;
387 return xdr_argsize_check(rqstp, p);
391 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p)
393 struct nfsd3_writeargs *args = rqstp->rq_argp;
394 unsigned int len, hdr, dlen;
395 u32 max_blocksize = svc_max_payload(rqstp);
396 struct kvec *head = rqstp->rq_arg.head;
397 struct kvec *tail = rqstp->rq_arg.tail;
399 p = decode_fh(p, &args->fh);
402 p = xdr_decode_hyper(p, &args->offset);
404 args->count = ntohl(*p++);
405 args->stable = ntohl(*p++);
406 len = args->len = ntohl(*p++);
407 if ((void *)p > head->iov_base + head->iov_len)
410 * The count must equal the amount of data passed.
412 if (args->count != args->len)
416 * Check to make sure that we got the right number of
419 hdr = (void*)p - head->iov_base;
420 dlen = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len - hdr;
422 * Round the length of the data which was specified up to
423 * the next multiple of XDR units and then compare that
424 * against the length which was actually received.
425 * Note that when RPCSEC/GSS (for example) is used, the
426 * data buffer can be padded so dlen might be larger
427 * than required. It must never be smaller.
429 if (dlen < XDR_QUADLEN(len)*4)
432 if (args->count > max_blocksize) {
433 args->count = max_blocksize;
434 len = args->len = max_blocksize;
437 args->first.iov_base = (void *)p;
438 args->first.iov_len = head->iov_len - hdr;
443 nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p)
445 struct nfsd3_createargs *args = rqstp->rq_argp;
447 if (!(p = decode_fh(p, &args->fh))
448 || !(p = decode_filename(p, &args->name, &args->len)))
451 switch (args->createmode = ntohl(*p++)) {
452 case NFS3_CREATE_UNCHECKED:
453 case NFS3_CREATE_GUARDED:
454 p = decode_sattr3(p, &args->attrs);
456 case NFS3_CREATE_EXCLUSIVE:
464 return xdr_argsize_check(rqstp, p);
468 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p)
470 struct nfsd3_createargs *args = rqstp->rq_argp;
472 if (!(p = decode_fh(p, &args->fh)) ||
473 !(p = decode_filename(p, &args->name, &args->len)))
475 p = decode_sattr3(p, &args->attrs);
477 return xdr_argsize_check(rqstp, p);
481 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p)
483 struct nfsd3_symlinkargs *args = rqstp->rq_argp;
484 char *base = (char *)p;
487 if (!(p = decode_fh(p, &args->ffh)) ||
488 !(p = decode_filename(p, &args->fname, &args->flen)))
490 p = decode_sattr3(p, &args->attrs);
492 args->tlen = ntohl(*p++);
494 args->first.iov_base = p;
495 args->first.iov_len = rqstp->rq_arg.head[0].iov_len;
496 args->first.iov_len -= (char *)p - base;
498 dlen = args->first.iov_len + rqstp->rq_arg.page_len +
499 rqstp->rq_arg.tail[0].iov_len;
500 if (dlen < XDR_QUADLEN(args->tlen) << 2)
506 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p)
508 struct nfsd3_mknodargs *args = rqstp->rq_argp;
510 if (!(p = decode_fh(p, &args->fh))
511 || !(p = decode_filename(p, &args->name, &args->len)))
514 args->ftype = ntohl(*p++);
516 if (args->ftype == NF3BLK || args->ftype == NF3CHR
517 || args->ftype == NF3SOCK || args->ftype == NF3FIFO)
518 p = decode_sattr3(p, &args->attrs);
520 if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
521 args->major = ntohl(*p++);
522 args->minor = ntohl(*p++);
525 return xdr_argsize_check(rqstp, p);
529 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p)
531 struct nfsd3_renameargs *args = rqstp->rq_argp;
533 if (!(p = decode_fh(p, &args->ffh))
534 || !(p = decode_filename(p, &args->fname, &args->flen))
535 || !(p = decode_fh(p, &args->tfh))
536 || !(p = decode_filename(p, &args->tname, &args->tlen)))
539 return xdr_argsize_check(rqstp, p);
543 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p)
545 struct nfsd3_readlinkargs *args = rqstp->rq_argp;
547 p = decode_fh(p, &args->fh);
550 args->buffer = page_address(*(rqstp->rq_next_page++));
552 return xdr_argsize_check(rqstp, p);
556 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p)
558 struct nfsd3_linkargs *args = rqstp->rq_argp;
560 if (!(p = decode_fh(p, &args->ffh))
561 || !(p = decode_fh(p, &args->tfh))
562 || !(p = decode_filename(p, &args->tname, &args->tlen)))
565 return xdr_argsize_check(rqstp, p);
569 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p)
571 struct nfsd3_readdirargs *args = rqstp->rq_argp;
572 p = decode_fh(p, &args->fh);
575 p = xdr_decode_hyper(p, &args->cookie);
576 args->verf = p; p += 2;
578 args->count = ntohl(*p++);
579 args->count = min_t(u32, args->count, PAGE_SIZE);
580 args->buffer = page_address(*(rqstp->rq_next_page++));
582 return xdr_argsize_check(rqstp, p);
586 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p)
588 struct nfsd3_readdirargs *args = rqstp->rq_argp;
590 u32 max_blocksize = svc_max_payload(rqstp);
592 p = decode_fh(p, &args->fh);
595 p = xdr_decode_hyper(p, &args->cookie);
596 args->verf = p; p += 2;
597 args->dircount = ntohl(*p++);
598 args->count = ntohl(*p++);
600 len = args->count = min(args->count, max_blocksize);
602 struct page *p = *(rqstp->rq_next_page++);
604 args->buffer = page_address(p);
608 return xdr_argsize_check(rqstp, p);
612 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p)
614 struct nfsd3_commitargs *args = rqstp->rq_argp;
615 p = decode_fh(p, &args->fh);
618 p = xdr_decode_hyper(p, &args->offset);
619 args->count = ntohl(*p++);
621 return xdr_argsize_check(rqstp, p);
625 * XDR encode functions
628 * There must be an encoding function for void results so svc_process
629 * will work properly.
632 nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
634 return xdr_ressize_check(rqstp, p);
639 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p)
641 struct nfsd3_attrstat *resp = rqstp->rq_resp;
643 if (resp->status == 0) {
644 lease_get_mtime(d_inode(resp->fh.fh_dentry),
646 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
648 return xdr_ressize_check(rqstp, p);
651 /* SETATTR, REMOVE, RMDIR */
653 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p)
655 struct nfsd3_attrstat *resp = rqstp->rq_resp;
657 p = encode_wcc_data(rqstp, p, &resp->fh);
658 return xdr_ressize_check(rqstp, p);
663 nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p)
665 struct nfsd3_diropres *resp = rqstp->rq_resp;
667 if (resp->status == 0) {
668 p = encode_fh(p, &resp->fh);
669 p = encode_post_op_attr(rqstp, p, &resp->fh);
671 p = encode_post_op_attr(rqstp, p, &resp->dirfh);
672 return xdr_ressize_check(rqstp, p);
677 nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p)
679 struct nfsd3_accessres *resp = rqstp->rq_resp;
681 p = encode_post_op_attr(rqstp, p, &resp->fh);
682 if (resp->status == 0)
683 *p++ = htonl(resp->access);
684 return xdr_ressize_check(rqstp, p);
689 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p)
691 struct nfsd3_readlinkres *resp = rqstp->rq_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)
713 struct nfsd3_readres *resp = rqstp->rq_resp;
715 p = encode_post_op_attr(rqstp, p, &resp->fh);
716 if (resp->status == 0) {
717 *p++ = htonl(resp->count);
718 *p++ = htonl(resp->eof);
719 *p++ = htonl(resp->count); /* xdr opaque count */
720 xdr_ressize_check(rqstp, p);
721 /* now update rqstp->rq_res to reflect data as well */
722 rqstp->rq_res.page_len = resp->count;
723 if (resp->count & 3) {
724 /* need to pad the tail */
725 rqstp->rq_res.tail[0].iov_base = p;
727 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
731 return xdr_ressize_check(rqstp, p);
736 nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p)
738 struct nfsd3_writeres *resp = rqstp->rq_resp;
739 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
741 p = encode_wcc_data(rqstp, p, &resp->fh);
742 if (resp->status == 0) {
743 *p++ = htonl(resp->count);
744 *p++ = htonl(resp->committed);
745 /* unique identifier, y2038 overflow can be ignored */
746 *p++ = htonl((u32)nn->nfssvc_boot.tv_sec);
747 *p++ = htonl(nn->nfssvc_boot.tv_nsec);
749 return xdr_ressize_check(rqstp, p);
752 /* CREATE, MKDIR, SYMLINK, MKNOD */
754 nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p)
756 struct nfsd3_diropres *resp = rqstp->rq_resp;
758 if (resp->status == 0) {
760 p = encode_fh(p, &resp->fh);
761 p = encode_post_op_attr(rqstp, p, &resp->fh);
763 p = encode_wcc_data(rqstp, p, &resp->dirfh);
764 return xdr_ressize_check(rqstp, p);
769 nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p)
771 struct nfsd3_renameres *resp = rqstp->rq_resp;
773 p = encode_wcc_data(rqstp, p, &resp->ffh);
774 p = encode_wcc_data(rqstp, p, &resp->tfh);
775 return xdr_ressize_check(rqstp, p);
780 nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p)
782 struct nfsd3_linkres *resp = rqstp->rq_resp;
784 p = encode_post_op_attr(rqstp, p, &resp->fh);
785 p = encode_wcc_data(rqstp, p, &resp->tfh);
786 return xdr_ressize_check(rqstp, p);
791 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p)
793 struct nfsd3_readdirres *resp = rqstp->rq_resp;
795 p = encode_post_op_attr(rqstp, p, &resp->fh);
797 if (resp->status == 0) {
798 /* stupid readdir cookie */
799 memcpy(p, resp->verf, 8); p += 2;
800 xdr_ressize_check(rqstp, p);
801 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
802 return 1; /*No room for trailer */
803 rqstp->rq_res.page_len = (resp->count) << 2;
805 /* add the 'tail' to the end of the 'head' page - page 0. */
806 rqstp->rq_res.tail[0].iov_base = p;
807 *p++ = 0; /* no more entries */
808 *p++ = htonl(resp->common.err == nfserr_eof);
809 rqstp->rq_res.tail[0].iov_len = 2<<2;
812 return xdr_ressize_check(rqstp, p);
816 encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
819 *p++ = xdr_one; /* mark entry present */
820 p = xdr_encode_hyper(p, ino); /* file id */
821 p = xdr_encode_array(p, name, namlen);/* name length & name */
823 cd->offset = p; /* remember pointer */
824 p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
830 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
831 const char *name, int namlen, u64 ino)
833 struct svc_export *exp;
834 struct dentry *dparent, *dchild;
835 __be32 rv = nfserr_noent;
837 dparent = cd->fh.fh_dentry;
838 exp = cd->fh.fh_export;
840 if (isdotent(name, namlen)) {
842 dchild = dget_parent(dparent);
843 /* filesystem root - cannot return filehandle for ".." */
844 if (dchild == dparent)
847 dchild = dget(dparent);
849 dchild = lookup_one_len_unlocked(name, dparent, namlen);
852 if (d_mountpoint(dchild))
854 if (d_really_is_negative(dchild))
856 if (dchild->d_inode->i_ino != ino)
858 rv = fh_compose(fhp, exp, dchild, &cd->fh);
864 static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen, u64 ino)
866 struct svc_fh *fh = &cd->scratch;
869 fh_init(fh, NFS3_FHSIZE);
870 err = compose_entry_fh(cd, fh, name, namlen, ino);
876 p = encode_post_op_attr(cd->rqstp, p, fh);
877 *p++ = xdr_one; /* yes, a file handle follows */
878 p = encode_fh(p, fh);
885 * Encode a directory entry. This one works for both normal readdir
887 * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
888 * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
890 * The readdirplus baggage is 1+21 words for post_op_attr, plus the
894 #define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1)
895 #define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
897 encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
898 loff_t offset, u64 ino, unsigned int d_type, int plus)
900 struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
902 __be32 *p = cd->buffer;
903 caddr_t curr_page_addr = NULL;
905 int slen; /* string (name) length */
906 int elen; /* estimated entry length in words */
907 int num_entry_words = 0; /* actual number of words */
910 u64 offset64 = offset;
912 if (unlikely(cd->offset1)) {
913 /* we ended up with offset on a page boundary */
914 *cd->offset = htonl(offset64 >> 32);
915 *cd->offset1 = htonl(offset64 & 0xffffffff);
918 xdr_encode_hyper(cd->offset, offset64);
923 dprintk("encode_entry(%.*s @%ld%s)\n",
924 namlen, name, (long) offset, plus? " plus" : "");
927 /* truncate filename if too long */
928 namlen = min(namlen, NFS3_MAXNAMLEN);
930 slen = XDR_QUADLEN(namlen);
931 elen = slen + NFS3_ENTRY_BAGGAGE
932 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
934 if (cd->buflen < elen) {
935 cd->common.err = nfserr_toosmall;
939 /* determine which page in rq_respages[] we are currently filling */
940 for (page = cd->rqstp->rq_respages + 1;
941 page < cd->rqstp->rq_next_page; page++) {
942 curr_page_addr = page_address(*page);
944 if (((caddr_t)cd->buffer >= curr_page_addr) &&
945 ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE))
949 if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
950 /* encode entry in current page */
952 p = encode_entry_baggage(cd, p, name, namlen, ino);
955 p = encode_entryplus_baggage(cd, p, name, namlen, ino);
956 num_entry_words = p - cd->buffer;
957 } else if (*(page+1) != NULL) {
958 /* temporarily encode entry into next page, then move back to
959 * current and next page in rq_respages[] */
963 /* grab next page for temporary storage of entry */
964 p1 = tmp = page_address(*(page+1));
966 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
969 p1 = encode_entryplus_baggage(cd, p1, name, namlen, ino);
971 /* determine entry word length and lengths to go in pages */
972 num_entry_words = p1 - tmp;
973 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
974 if ((num_entry_words << 2) < len1) {
975 /* the actual number of words in the entry is less
976 * than elen and can still fit in the current page
978 memmove(p, tmp, num_entry_words << 2);
979 p += num_entry_words;
982 cd->offset = cd->buffer + (cd->offset - tmp);
984 unsigned int offset_r = (cd->offset - tmp) << 2;
986 /* update pointer to offset location.
987 * This is a 64bit quantity, so we need to
989 * - entirely in first page
990 * - entirely in second page
991 * - 4 bytes in each page
993 if (offset_r + 8 <= len1) {
994 cd->offset = p + (cd->offset - tmp);
995 } else if (offset_r >= len1) {
996 cd->offset -= len1 >> 2;
998 /* sitting on the fence */
999 BUG_ON(offset_r != len1 - 4);
1000 cd->offset = p + (cd->offset - tmp);
1004 len2 = (num_entry_words << 2) - len1;
1006 /* move from temp page to current and next pages */
1007 memmove(p, tmp, len1);
1008 memmove(tmp, (caddr_t)tmp+len1, len2);
1010 p = tmp + (len2 >> 2);
1014 cd->common.err = nfserr_toosmall;
1018 cd->buflen -= num_entry_words;
1020 cd->common.err = nfs_ok;
1026 nfs3svc_encode_entry(void *cd, const char *name,
1027 int namlen, loff_t offset, u64 ino, unsigned int d_type)
1029 return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
1033 nfs3svc_encode_entry_plus(void *cd, const char *name,
1034 int namlen, loff_t offset, u64 ino,
1035 unsigned int d_type)
1037 return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1042 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p)
1044 struct nfsd3_fsstatres *resp = rqstp->rq_resp;
1045 struct kstatfs *s = &resp->stats;
1046 u64 bs = s->f_bsize;
1048 *p++ = xdr_zero; /* no post_op_attr */
1050 if (resp->status == 0) {
1051 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */
1052 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */
1053 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */
1054 p = xdr_encode_hyper(p, s->f_files); /* total inodes */
1055 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */
1056 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */
1057 *p++ = htonl(resp->invarsec); /* mean unchanged time */
1059 return xdr_ressize_check(rqstp, p);
1064 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p)
1066 struct nfsd3_fsinfores *resp = rqstp->rq_resp;
1068 *p++ = xdr_zero; /* no post_op_attr */
1070 if (resp->status == 0) {
1071 *p++ = htonl(resp->f_rtmax);
1072 *p++ = htonl(resp->f_rtpref);
1073 *p++ = htonl(resp->f_rtmult);
1074 *p++ = htonl(resp->f_wtmax);
1075 *p++ = htonl(resp->f_wtpref);
1076 *p++ = htonl(resp->f_wtmult);
1077 *p++ = htonl(resp->f_dtpref);
1078 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1081 *p++ = htonl(resp->f_properties);
1084 return xdr_ressize_check(rqstp, p);
1089 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p)
1091 struct nfsd3_pathconfres *resp = rqstp->rq_resp;
1093 *p++ = xdr_zero; /* no post_op_attr */
1095 if (resp->status == 0) {
1096 *p++ = htonl(resp->p_link_max);
1097 *p++ = htonl(resp->p_name_max);
1098 *p++ = htonl(resp->p_no_trunc);
1099 *p++ = htonl(resp->p_chown_restricted);
1100 *p++ = htonl(resp->p_case_insensitive);
1101 *p++ = htonl(resp->p_case_preserving);
1104 return xdr_ressize_check(rqstp, p);
1109 nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p)
1111 struct nfsd3_commitres *resp = rqstp->rq_resp;
1112 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1114 p = encode_wcc_data(rqstp, p, &resp->fh);
1115 /* Write verifier */
1116 if (resp->status == 0) {
1117 /* unique identifier, y2038 overflow can be ignored */
1118 *p++ = htonl((u32)nn->nfssvc_boot.tv_sec);
1119 *p++ = htonl(nn->nfssvc_boot.tv_nsec);
1121 return xdr_ressize_check(rqstp, p);
1125 * XDR release functions
1128 nfs3svc_release_fhandle(struct svc_rqst *rqstp)
1130 struct nfsd3_attrstat *resp = rqstp->rq_resp;
1136 nfs3svc_release_fhandle2(struct svc_rqst *rqstp)
1138 struct nfsd3_fhandle_pair *resp = rqstp->rq_resp;