2 * linux/fs/nfsd/nfs3xdr.c
4 * XDR support for nfsd/protocol version 3.
6 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
8 * 2003-08-09 Jamie Lokier: Use htonl() for nanoseconds, not htons()!
11 #include <linux/types.h>
12 #include <linux/time.h>
13 #include <linux/nfs3.h>
14 #include <linux/list.h>
15 #include <linux/spinlock.h>
16 #include <linux/dcache.h>
17 #include <linux/namei.h>
19 #include <linux/vfs.h>
20 #include <linux/sunrpc/xdr.h>
21 #include <linux/sunrpc/svc.h>
22 #include <linux/nfsd/nfsd.h>
23 #include <linux/nfsd/xdr3.h>
25 #define NFSDDBG_FACILITY NFSDDBG_XDR
27 #ifdef NFSD_OPTIMIZE_SPACE
33 * Mapping of S_IF* types to NFS file types
35 static u32 nfs3_ftypes[] = {
36 NF3NON, NF3FIFO, NF3CHR, NF3BAD,
37 NF3DIR, NF3BAD, NF3BLK, NF3BAD,
38 NF3REG, NF3BAD, NF3LNK, NF3BAD,
39 NF3SOCK, NF3BAD, NF3LNK, NF3BAD,
43 * XDR functions for basic NFS types
46 encode_time3(u32 *p, struct timespec *time)
48 *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
53 decode_time3(u32 *p, struct timespec *time)
55 time->tv_sec = ntohl(*p++);
56 time->tv_nsec = ntohl(*p++);
61 decode_fh(u32 *p, struct svc_fh *fhp)
64 fh_init(fhp, NFS3_FHSIZE);
66 if (size > NFS3_FHSIZE)
69 memcpy(&fhp->fh_handle.fh_base, p, size);
70 fhp->fh_handle.fh_size = size;
71 return p + XDR_QUADLEN(size);
75 encode_fh(u32 *p, struct svc_fh *fhp)
77 unsigned int size = fhp->fh_handle.fh_size;
79 if (size) p[XDR_QUADLEN(size)-1]=0;
80 memcpy(p, &fhp->fh_handle.fh_base, size);
81 return p + XDR_QUADLEN(size);
85 * Decode a file name and make sure that the path contains
86 * no slashes or null bytes.
89 decode_filename(u32 *p, char **namp, int *lenp)
94 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) {
95 for (i = 0, name = *namp; i < *lenp; i++, name++) {
96 if (*name == '\0' || *name == '/')
105 decode_pathname(u32 *p, char **namp, int *lenp)
110 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXPATHLEN)) != NULL) {
111 for (i = 0, name = *namp; i < *lenp; i++, name++) {
121 decode_sattr3(u32 *p, struct iattr *iap)
128 iap->ia_valid |= ATTR_MODE;
129 iap->ia_mode = ntohl(*p++);
132 iap->ia_valid |= ATTR_UID;
133 iap->ia_uid = ntohl(*p++);
136 iap->ia_valid |= ATTR_GID;
137 iap->ia_gid = ntohl(*p++);
142 iap->ia_valid |= ATTR_SIZE;
143 p = xdr_decode_hyper(p, &newsize);
144 if (newsize <= NFS_OFFSET_MAX)
145 iap->ia_size = newsize;
147 iap->ia_size = NFS_OFFSET_MAX;
149 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
150 iap->ia_valid |= ATTR_ATIME;
151 } else if (tmp == 2) { /* set to client time */
152 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
153 iap->ia_atime.tv_sec = ntohl(*p++);
154 iap->ia_atime.tv_nsec = ntohl(*p++);
156 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
157 iap->ia_valid |= ATTR_MTIME;
158 } else if (tmp == 2) { /* set to client time */
159 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
160 iap->ia_mtime.tv_sec = ntohl(*p++);
161 iap->ia_mtime.tv_nsec = ntohl(*p++);
167 encode_fattr3(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
169 struct vfsmount *mnt = fhp->fh_export->ex_mnt;
170 struct dentry *dentry = fhp->fh_dentry;
172 struct timespec time;
174 vfs_getattr(mnt, dentry, &stat);
176 *p++ = htonl(nfs3_ftypes[(stat.mode & S_IFMT) >> 12]);
177 *p++ = htonl((u32) stat.mode);
178 *p++ = htonl((u32) stat.nlink);
179 *p++ = htonl((u32) nfsd_ruid(rqstp, stat.uid));
180 *p++ = htonl((u32) nfsd_rgid(rqstp, stat.gid));
181 if (S_ISLNK(stat.mode) && stat.size > NFS3_MAXPATHLEN) {
182 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
184 p = xdr_encode_hyper(p, (u64) stat.size);
186 p = xdr_encode_hyper(p, ((u64)stat.blocks) << 9);
187 *p++ = htonl((u32) MAJOR(stat.rdev));
188 *p++ = htonl((u32) MINOR(stat.rdev));
189 if (is_fsid(fhp, rqstp->rq_reffh))
190 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
192 p = xdr_encode_hyper(p, (u64) huge_encode_dev(stat.dev));
193 p = xdr_encode_hyper(p, (u64) stat.ino);
194 p = encode_time3(p, &stat.atime);
195 lease_get_mtime(dentry->d_inode, &time);
196 p = encode_time3(p, &time);
197 p = encode_time3(p, &stat.ctime);
203 encode_saved_post_attr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
205 struct inode *inode = fhp->fh_dentry->d_inode;
207 /* Attributes to follow */
210 *p++ = htonl(nfs3_ftypes[(fhp->fh_post_mode & S_IFMT) >> 12]);
211 *p++ = htonl((u32) fhp->fh_post_mode);
212 *p++ = htonl((u32) fhp->fh_post_nlink);
213 *p++ = htonl((u32) nfsd_ruid(rqstp, fhp->fh_post_uid));
214 *p++ = htonl((u32) nfsd_rgid(rqstp, fhp->fh_post_gid));
215 if (S_ISLNK(fhp->fh_post_mode) && fhp->fh_post_size > NFS3_MAXPATHLEN) {
216 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
218 p = xdr_encode_hyper(p, (u64) fhp->fh_post_size);
220 p = xdr_encode_hyper(p, ((u64)fhp->fh_post_blocks) << 9);
221 *p++ = fhp->fh_post_rdev[0];
222 *p++ = fhp->fh_post_rdev[1];
223 if (is_fsid(fhp, rqstp->rq_reffh))
224 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
226 p = xdr_encode_hyper(p, (u64)huge_encode_dev(inode->i_sb->s_dev));
227 p = xdr_encode_hyper(p, (u64) inode->i_ino);
228 p = encode_time3(p, &fhp->fh_post_atime);
229 p = encode_time3(p, &fhp->fh_post_mtime);
230 p = encode_time3(p, &fhp->fh_post_ctime);
236 * Encode post-operation attributes.
237 * The inode may be NULL if the call failed because of a stale file
238 * handle. In this case, no attributes are returned.
241 encode_post_op_attr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
243 struct dentry *dentry = fhp->fh_dentry;
244 if (dentry && dentry->d_inode != NULL) {
245 *p++ = xdr_one; /* attributes follow */
246 return encode_fattr3(rqstp, p, fhp);
253 * Enocde weak cache consistency data
256 encode_wcc_data(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
258 struct dentry *dentry = fhp->fh_dentry;
260 if (dentry && dentry->d_inode && fhp->fh_post_saved) {
261 if (fhp->fh_pre_saved) {
263 p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
264 p = encode_time3(p, &fhp->fh_pre_mtime);
265 p = encode_time3(p, &fhp->fh_pre_ctime);
269 return encode_saved_post_attr(rqstp, p, fhp);
271 /* no pre- or post-attrs */
273 return encode_post_op_attr(rqstp, p, fhp);
278 * XDR decode functions
281 nfs3svc_decode_fhandle(struct svc_rqst *rqstp, u32 *p, struct nfsd_fhandle *args)
283 if (!(p = decode_fh(p, &args->fh)))
285 return xdr_argsize_check(rqstp, p);
289 nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, u32 *p,
290 struct nfsd3_sattrargs *args)
292 if (!(p = decode_fh(p, &args->fh))
293 || !(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, u32 *p,
307 struct nfsd3_diropargs *args)
309 if (!(p = decode_fh(p, &args->fh))
310 || !(p = decode_filename(p, &args->name, &args->len)))
313 return xdr_argsize_check(rqstp, p);
317 nfs3svc_decode_accessargs(struct svc_rqst *rqstp, u32 *p,
318 struct nfsd3_accessargs *args)
320 if (!(p = decode_fh(p, &args->fh)))
322 args->access = ntohl(*p++);
324 return xdr_argsize_check(rqstp, p);
328 nfs3svc_decode_readargs(struct svc_rqst *rqstp, u32 *p,
329 struct nfsd3_readargs *args)
334 if (!(p = decode_fh(p, &args->fh))
335 || !(p = xdr_decode_hyper(p, &args->offset)))
338 len = args->count = ntohl(*p++);
340 if (len > NFSSVC_MAXBLKSIZE)
341 len = NFSSVC_MAXBLKSIZE;
343 /* set up the kvec */
346 pn = rqstp->rq_resused;
347 svc_take_page(rqstp);
348 args->vec[v].iov_base = page_address(rqstp->rq_respages[pn]);
349 args->vec[v].iov_len = len < PAGE_SIZE? len : PAGE_SIZE;
350 len -= args->vec[v].iov_len;
354 return xdr_argsize_check(rqstp, p);
358 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, u32 *p,
359 struct nfsd3_writeargs *args)
361 unsigned int len, v, hdr;
363 if (!(p = decode_fh(p, &args->fh))
364 || !(p = xdr_decode_hyper(p, &args->offset)))
367 args->count = ntohl(*p++);
368 args->stable = ntohl(*p++);
369 len = args->len = ntohl(*p++);
371 hdr = (void*)p - rqstp->rq_arg.head[0].iov_base;
372 if (rqstp->rq_arg.len < len + hdr)
375 args->vec[0].iov_base = (void*)p;
376 args->vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
378 if (len > NFSSVC_MAXBLKSIZE)
379 len = NFSSVC_MAXBLKSIZE;
381 while (len > args->vec[v].iov_len) {
382 len -= args->vec[v].iov_len;
384 args->vec[v].iov_base = page_address(rqstp->rq_argpages[v]);
385 args->vec[v].iov_len = PAGE_SIZE;
387 args->vec[v].iov_len = len;
390 return args->count == args->len && args->vec[0].iov_len > 0;
394 nfs3svc_decode_createargs(struct svc_rqst *rqstp, u32 *p,
395 struct nfsd3_createargs *args)
397 if (!(p = decode_fh(p, &args->fh))
398 || !(p = decode_filename(p, &args->name, &args->len)))
401 switch (args->createmode = ntohl(*p++)) {
402 case NFS3_CREATE_UNCHECKED:
403 case NFS3_CREATE_GUARDED:
404 if (!(p = decode_sattr3(p, &args->attrs)))
407 case NFS3_CREATE_EXCLUSIVE:
415 return xdr_argsize_check(rqstp, p);
418 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, u32 *p,
419 struct nfsd3_createargs *args)
421 if (!(p = decode_fh(p, &args->fh))
422 || !(p = decode_filename(p, &args->name, &args->len))
423 || !(p = decode_sattr3(p, &args->attrs)))
426 return xdr_argsize_check(rqstp, p);
430 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, u32 *p,
431 struct nfsd3_symlinkargs *args)
438 if (!(p = decode_fh(p, &args->ffh))
439 || !(p = decode_filename(p, &args->fname, &args->flen))
440 || !(p = decode_sattr3(p, &args->attrs))
443 /* now decode the pathname, which might be larger than the first page.
444 * As we have to check for nul's anyway, we copy it into a new page
445 * This page appears in the rq_res.pages list, but as pages_len is always
446 * 0, it won't get in the way
448 svc_take_page(rqstp);
450 if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE)
452 args->tname = new = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);
454 /* first copy and check from the first page */
456 vec = &rqstp->rq_arg.head[0];
457 avail = vec->iov_len - (old - (char*)vec->iov_base);
458 while (len && avail && *old) {
463 /* now copy next page if there is one */
464 if (len && !avail && rqstp->rq_arg.page_len) {
465 avail = rqstp->rq_arg.page_len;
466 if (avail > PAGE_SIZE) avail = PAGE_SIZE;
467 old = page_address(rqstp->rq_arg.pages[0]);
469 while (len && avail && *old) {
482 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, u32 *p,
483 struct nfsd3_mknodargs *args)
485 if (!(p = decode_fh(p, &args->fh))
486 || !(p = decode_filename(p, &args->name, &args->len)))
489 args->ftype = ntohl(*p++);
491 if (args->ftype == NF3BLK || args->ftype == NF3CHR
492 || args->ftype == NF3SOCK || args->ftype == NF3FIFO) {
493 if (!(p = decode_sattr3(p, &args->attrs)))
497 if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
498 args->major = ntohl(*p++);
499 args->minor = ntohl(*p++);
502 return xdr_argsize_check(rqstp, p);
506 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, u32 *p,
507 struct nfsd3_renameargs *args)
509 if (!(p = decode_fh(p, &args->ffh))
510 || !(p = decode_filename(p, &args->fname, &args->flen))
511 || !(p = decode_fh(p, &args->tfh))
512 || !(p = decode_filename(p, &args->tname, &args->tlen)))
515 return xdr_argsize_check(rqstp, p);
519 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, u32 *p,
520 struct nfsd3_readlinkargs *args)
522 if (!(p = decode_fh(p, &args->fh)))
524 svc_take_page(rqstp);
525 args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);
527 return xdr_argsize_check(rqstp, p);
531 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, u32 *p,
532 struct nfsd3_linkargs *args)
534 if (!(p = decode_fh(p, &args->ffh))
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_readdirargs(struct svc_rqst *rqstp, u32 *p,
544 struct nfsd3_readdirargs *args)
546 if (!(p = decode_fh(p, &args->fh)))
548 p = xdr_decode_hyper(p, &args->cookie);
549 args->verf = p; p += 2;
551 args->count = ntohl(*p++);
553 if (args->count > PAGE_SIZE)
554 args->count = PAGE_SIZE;
556 svc_take_page(rqstp);
557 args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);
559 return xdr_argsize_check(rqstp, p);
563 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, u32 *p,
564 struct nfsd3_readdirargs *args)
568 if (!(p = decode_fh(p, &args->fh)))
570 p = xdr_decode_hyper(p, &args->cookie);
571 args->verf = p; p += 2;
572 args->dircount = ntohl(*p++);
573 args->count = ntohl(*p++);
575 len = (args->count > NFSSVC_MAXBLKSIZE) ? NFSSVC_MAXBLKSIZE :
580 pn = rqstp->rq_resused;
581 svc_take_page(rqstp);
583 args->buffer = page_address(rqstp->rq_respages[pn]);
587 return xdr_argsize_check(rqstp, p);
591 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, u32 *p,
592 struct nfsd3_commitargs *args)
594 if (!(p = decode_fh(p, &args->fh)))
596 p = xdr_decode_hyper(p, &args->offset);
597 args->count = ntohl(*p++);
599 return xdr_argsize_check(rqstp, p);
603 * XDR encode functions
606 * There must be an encoding function for void results so svc_process
607 * will work properly.
610 nfs3svc_encode_voidres(struct svc_rqst *rqstp, u32 *p, void *dummy)
612 return xdr_ressize_check(rqstp, p);
617 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, u32 *p,
618 struct nfsd3_attrstat *resp)
620 if (resp->status == 0)
621 p = encode_fattr3(rqstp, p, &resp->fh);
622 return xdr_ressize_check(rqstp, p);
625 /* SETATTR, REMOVE, RMDIR */
627 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, u32 *p,
628 struct nfsd3_attrstat *resp)
630 p = encode_wcc_data(rqstp, p, &resp->fh);
631 return xdr_ressize_check(rqstp, p);
636 nfs3svc_encode_diropres(struct svc_rqst *rqstp, u32 *p,
637 struct nfsd3_diropres *resp)
639 if (resp->status == 0) {
640 p = encode_fh(p, &resp->fh);
641 p = encode_post_op_attr(rqstp, p, &resp->fh);
643 p = encode_post_op_attr(rqstp, p, &resp->dirfh);
644 return xdr_ressize_check(rqstp, p);
649 nfs3svc_encode_accessres(struct svc_rqst *rqstp, u32 *p,
650 struct nfsd3_accessres *resp)
652 p = encode_post_op_attr(rqstp, p, &resp->fh);
653 if (resp->status == 0)
654 *p++ = htonl(resp->access);
655 return xdr_ressize_check(rqstp, p);
660 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, u32 *p,
661 struct nfsd3_readlinkres *resp)
663 p = encode_post_op_attr(rqstp, p, &resp->fh);
664 if (resp->status == 0) {
665 *p++ = htonl(resp->len);
666 xdr_ressize_check(rqstp, p);
667 rqstp->rq_res.page_len = resp->len;
669 /* need to pad the tail */
670 rqstp->rq_restailpage = 0;
671 rqstp->rq_res.tail[0].iov_base = p;
673 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
677 return xdr_ressize_check(rqstp, p);
682 nfs3svc_encode_readres(struct svc_rqst *rqstp, u32 *p,
683 struct nfsd3_readres *resp)
685 p = encode_post_op_attr(rqstp, p, &resp->fh);
686 if (resp->status == 0) {
687 *p++ = htonl(resp->count);
688 *p++ = htonl(resp->eof);
689 *p++ = htonl(resp->count); /* xdr opaque count */
690 xdr_ressize_check(rqstp, p);
691 /* now update rqstp->rq_res to reflect data aswell */
692 rqstp->rq_res.page_len = resp->count;
693 if (resp->count & 3) {
694 /* need to pad the tail */
695 rqstp->rq_restailpage = 0;
696 rqstp->rq_res.tail[0].iov_base = p;
698 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
702 return xdr_ressize_check(rqstp, p);
707 nfs3svc_encode_writeres(struct svc_rqst *rqstp, u32 *p,
708 struct nfsd3_writeres *resp)
710 p = encode_wcc_data(rqstp, p, &resp->fh);
711 if (resp->status == 0) {
712 *p++ = htonl(resp->count);
713 *p++ = htonl(resp->committed);
714 *p++ = htonl(nfssvc_boot.tv_sec);
715 *p++ = htonl(nfssvc_boot.tv_usec);
717 return xdr_ressize_check(rqstp, p);
720 /* CREATE, MKDIR, SYMLINK, MKNOD */
722 nfs3svc_encode_createres(struct svc_rqst *rqstp, u32 *p,
723 struct nfsd3_diropres *resp)
725 if (resp->status == 0) {
727 p = encode_fh(p, &resp->fh);
728 p = encode_post_op_attr(rqstp, p, &resp->fh);
730 p = encode_wcc_data(rqstp, p, &resp->dirfh);
731 return xdr_ressize_check(rqstp, p);
736 nfs3svc_encode_renameres(struct svc_rqst *rqstp, u32 *p,
737 struct nfsd3_renameres *resp)
739 p = encode_wcc_data(rqstp, p, &resp->ffh);
740 p = encode_wcc_data(rqstp, p, &resp->tfh);
741 return xdr_ressize_check(rqstp, p);
746 nfs3svc_encode_linkres(struct svc_rqst *rqstp, u32 *p,
747 struct nfsd3_linkres *resp)
749 p = encode_post_op_attr(rqstp, p, &resp->fh);
750 p = encode_wcc_data(rqstp, p, &resp->tfh);
751 return xdr_ressize_check(rqstp, p);
756 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, u32 *p,
757 struct nfsd3_readdirres *resp)
759 p = encode_post_op_attr(rqstp, p, &resp->fh);
761 if (resp->status == 0) {
762 /* stupid readdir cookie */
763 memcpy(p, resp->verf, 8); p += 2;
764 xdr_ressize_check(rqstp, p);
766 *p++ = 0; /* no more entries */
767 *p++ = htonl(resp->common.err == nfserr_eof);
768 rqstp->rq_res.page_len = (resp->count + 2) << 2;
771 return xdr_ressize_check(rqstp, p);
775 encode_entry_baggage(struct nfsd3_readdirres *cd, u32 *p, const char *name,
776 int namlen, ino_t ino)
778 *p++ = xdr_one; /* mark entry present */
779 p = xdr_encode_hyper(p, ino); /* file id */
780 p = xdr_encode_array(p, name, namlen);/* name length & name */
782 cd->offset = p; /* remember pointer */
783 p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
789 encode_entryplus_baggage(struct nfsd3_readdirres *cd, u32 *p,
792 p = encode_post_op_attr(cd->rqstp, p, fhp);
793 *p++ = xdr_one; /* yes, a file handle follows */
794 p = encode_fh(p, fhp);
800 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
801 const char *name, int namlen)
803 struct svc_export *exp;
804 struct dentry *dparent, *dchild;
807 dparent = cd->fh.fh_dentry;
808 exp = cd->fh.fh_export;
810 fh_init(fhp, NFS3_FHSIZE);
811 if (isdotent(name, namlen)) {
813 dchild = dget_parent(dparent);
815 dchild = dget(dparent);
817 dchild = lookup_one_len(name, dparent, namlen);
820 if (d_mountpoint(dchild) ||
821 fh_compose(fhp, exp, dchild, &cd->fh) != 0 ||
829 * Encode a directory entry. This one works for both normal readdir
831 * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
832 * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
834 * The readdirplus baggage is 1+21 words for post_op_attr, plus the
838 #define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1)
839 #define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
841 encode_entry(struct readdir_cd *ccd, const char *name,
842 int namlen, off_t offset, ino_t ino, unsigned int d_type, int plus)
844 struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
847 caddr_t curr_page_addr = NULL;
848 int pn; /* current page number */
849 int slen; /* string (name) length */
850 int elen; /* estimated entry length in words */
851 int num_entry_words = 0; /* actual number of words */
854 u64 offset64 = offset;
856 if (unlikely(cd->offset1)) {
857 /* we ended up with offset on a page boundary */
858 *cd->offset = htonl(offset64 >> 32);
859 *cd->offset1 = htonl(offset64 & 0xffffffff);
862 xdr_encode_hyper(cd->offset, (u64) offset);
867 dprintk("encode_entry(%.*s @%ld%s)\n",
868 namlen, name, (long) offset, plus? " plus" : "");
871 /* truncate filename if too long */
872 if (namlen > NFS3_MAXNAMLEN)
873 namlen = NFS3_MAXNAMLEN;
875 slen = XDR_QUADLEN(namlen);
876 elen = slen + NFS3_ENTRY_BAGGAGE
877 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
879 if (cd->buflen < elen) {
880 cd->common.err = nfserr_toosmall;
884 /* determine which page in rq_respages[] we are currently filling */
885 for (pn=1; pn < cd->rqstp->rq_resused; pn++) {
886 curr_page_addr = page_address(cd->rqstp->rq_respages[pn]);
888 if (((caddr_t)cd->buffer >= curr_page_addr) &&
889 ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE))
893 if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
894 /* encode entry in current page */
896 p = encode_entry_baggage(cd, p, name, namlen, ino);
898 /* throw in readdirplus baggage */
902 if (compose_entry_fh(cd, &fh, name, namlen) > 0) {
906 p = encode_entryplus_baggage(cd, p, &fh);
908 num_entry_words = p - cd->buffer;
909 } else if (cd->rqstp->rq_respages[pn+1] != NULL) {
910 /* temporarily encode entry into next page, then move back to
911 * current and next page in rq_respages[] */
915 /* grab next page for temporary storage of entry */
916 p1 = tmp = page_address(cd->rqstp->rq_respages[pn+1]);
918 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
920 /* throw in readdirplus baggage */
924 if (compose_entry_fh(cd, &fh, name, namlen) > 0) {
925 /* zero out the filehandle */
929 p1 = encode_entryplus_baggage(cd, p1, &fh);
932 /* determine entry word length and lengths to go in pages */
933 num_entry_words = p1 - tmp;
934 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
935 if ((num_entry_words << 2) < len1) {
936 /* the actual number of words in the entry is less
937 * than elen and can still fit in the current page
939 memmove(p, tmp, num_entry_words << 2);
940 p += num_entry_words;
943 cd->offset = cd->buffer + (cd->offset - tmp);
945 unsigned int offset_r = (cd->offset - tmp) << 2;
947 /* update pointer to offset location.
948 * This is a 64bit quantity, so we need to
950 * - entirely in first page
951 * - entirely in second page
952 * - 4 bytes in each page
954 if (offset_r + 8 <= len1) {
955 cd->offset = p + (cd->offset - tmp);
956 } else if (offset_r >= len1) {
957 cd->offset -= len1 >> 2;
959 /* sitting on the fence */
960 BUG_ON(offset_r != len1 - 4);
961 cd->offset = p + (cd->offset - tmp);
965 len2 = (num_entry_words << 2) - len1;
967 /* move from temp page to current and next pages */
968 memmove(p, tmp, len1);
969 memmove(tmp, (caddr_t)tmp+len1, len2);
971 p = tmp + (len2 >> 2);
975 cd->common.err = nfserr_toosmall;
979 cd->buflen -= num_entry_words;
981 cd->common.err = nfs_ok;
987 nfs3svc_encode_entry(struct readdir_cd *cd, const char *name,
988 int namlen, loff_t offset, ino_t ino, unsigned int d_type)
990 return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
994 nfs3svc_encode_entry_plus(struct readdir_cd *cd, const char *name,
995 int namlen, loff_t offset, ino_t ino, unsigned int d_type)
997 return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1002 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, u32 *p,
1003 struct nfsd3_fsstatres *resp)
1005 struct kstatfs *s = &resp->stats;
1006 u64 bs = s->f_bsize;
1008 *p++ = xdr_zero; /* no post_op_attr */
1010 if (resp->status == 0) {
1011 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */
1012 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */
1013 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */
1014 p = xdr_encode_hyper(p, s->f_files); /* total inodes */
1015 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */
1016 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */
1017 *p++ = htonl(resp->invarsec); /* mean unchanged time */
1019 return xdr_ressize_check(rqstp, p);
1024 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, u32 *p,
1025 struct nfsd3_fsinfores *resp)
1027 *p++ = xdr_zero; /* no post_op_attr */
1029 if (resp->status == 0) {
1030 *p++ = htonl(resp->f_rtmax);
1031 *p++ = htonl(resp->f_rtpref);
1032 *p++ = htonl(resp->f_rtmult);
1033 *p++ = htonl(resp->f_wtmax);
1034 *p++ = htonl(resp->f_wtpref);
1035 *p++ = htonl(resp->f_wtmult);
1036 *p++ = htonl(resp->f_dtpref);
1037 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1040 *p++ = htonl(resp->f_properties);
1043 return xdr_ressize_check(rqstp, p);
1048 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, u32 *p,
1049 struct nfsd3_pathconfres *resp)
1051 *p++ = xdr_zero; /* no post_op_attr */
1053 if (resp->status == 0) {
1054 *p++ = htonl(resp->p_link_max);
1055 *p++ = htonl(resp->p_name_max);
1056 *p++ = htonl(resp->p_no_trunc);
1057 *p++ = htonl(resp->p_chown_restricted);
1058 *p++ = htonl(resp->p_case_insensitive);
1059 *p++ = htonl(resp->p_case_preserving);
1062 return xdr_ressize_check(rqstp, p);
1067 nfs3svc_encode_commitres(struct svc_rqst *rqstp, u32 *p,
1068 struct nfsd3_commitres *resp)
1070 p = encode_wcc_data(rqstp, p, &resp->fh);
1071 /* Write verifier */
1072 if (resp->status == 0) {
1073 *p++ = htonl(nfssvc_boot.tv_sec);
1074 *p++ = htonl(nfssvc_boot.tv_usec);
1076 return xdr_ressize_check(rqstp, p);
1080 * XDR release functions
1083 nfs3svc_release_fhandle(struct svc_rqst *rqstp, u32 *p,
1084 struct nfsd3_attrstat *resp)
1091 nfs3svc_release_fhandle2(struct svc_rqst *rqstp, u32 *p,
1092 struct nfsd3_fhandle_pair *resp)