Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1171 insertions, 0 deletions

diff --git a/fs/nfsd/nfs3xdr.c b/fs/nfsd/nfs3xdr.c
new file mode 100644
index 000000000..716566da4
--- /dev/null
+++ b/fs/nfsd/nfs3xdr.c
@@ -0,0 +1,1171 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * XDR support for nfsd/protocol version 3.
+ *
+ * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
+ *
+ * 2003-08-09 Jamie Lokier: Use htonl() for nanoseconds, not htons()!
+ */
+
+#include <linux/namei.h>
+#include <linux/sunrpc/svc_xprt.h>
+#include "xdr3.h"
+#include "auth.h"
+#include "netns.h"
+#include "vfs.h"
+
+#define NFSDDBG_FACILITY		NFSDDBG_XDR
+
+
+/*
+ * Mapping of S_IF* types to NFS file types
+ */
+static u32	nfs3_ftypes[] = {
+	NF3NON,  NF3FIFO, NF3CHR, NF3BAD,
+	NF3DIR,  NF3BAD,  NF3BLK, NF3BAD,
+	NF3REG,  NF3BAD,  NF3LNK, NF3BAD,
+	NF3SOCK, NF3BAD,  NF3LNK, NF3BAD,
+};
+
+
+/*
+ * XDR functions for basic NFS types
+ */
+static __be32 *
+encode_time3(__be32 *p, struct timespec64 *time)
+{
+	*p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
+	return p;
+}
+
+static __be32 *
+decode_time3(__be32 *p, struct timespec64 *time)
+{
+	time->tv_sec = ntohl(*p++);
+	time->tv_nsec = ntohl(*p++);
+	return p;
+}
+
+static __be32 *
+decode_fh(__be32 *p, struct svc_fh *fhp)
+{
+	unsigned int size;
+	fh_init(fhp, NFS3_FHSIZE);
+	size = ntohl(*p++);
+	if (size > NFS3_FHSIZE)
+		return NULL;
+
+	memcpy(&fhp->fh_handle.fh_base, p, size);
+	fhp->fh_handle.fh_size = size;
+	return p + XDR_QUADLEN(size);
+}
+
+/* Helper function for NFSv3 ACL code */
+__be32 *nfs3svc_decode_fh(__be32 *p, struct svc_fh *fhp)
+{
+	return decode_fh(p, fhp);
+}
+
+static __be32 *
+encode_fh(__be32 *p, struct svc_fh *fhp)
+{
+	unsigned int size = fhp->fh_handle.fh_size;
+	*p++ = htonl(size);
+	if (size) p[XDR_QUADLEN(size)-1]=0;
+	memcpy(p, &fhp->fh_handle.fh_base, size);
+	return p + XDR_QUADLEN(size);
+}
+
+/*
+ * Decode a file name and make sure that the path contains
+ * no slashes or null bytes.
+ */
+static __be32 *
+decode_filename(__be32 *p, char **namp, unsigned int *lenp)
+{
+	char		*name;
+	unsigned int	i;
+
+	if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) {
+		for (i = 0, name = *namp; i < *lenp; i++, name++) {
+			if (*name == '\0' || *name == '/')
+				return NULL;
+		}
+	}
+
+	return p;
+}
+
+static __be32 *
+decode_sattr3(__be32 *p, struct iattr *iap, struct user_namespace *userns)
+{
+	u32	tmp;
+
+	iap->ia_valid = 0;
+
+	if (*p++) {
+		iap->ia_valid |= ATTR_MODE;
+		iap->ia_mode = ntohl(*p++);
+	}
+	if (*p++) {
+		iap->ia_uid = make_kuid(userns, ntohl(*p++));
+		if (uid_valid(iap->ia_uid))
+			iap->ia_valid |= ATTR_UID;
+	}
+	if (*p++) {
+		iap->ia_gid = make_kgid(userns, ntohl(*p++));
+		if (gid_valid(iap->ia_gid))
+			iap->ia_valid |= ATTR_GID;
+	}
+	if (*p++) {
+		u64	newsize;
+
+		iap->ia_valid |= ATTR_SIZE;
+		p = xdr_decode_hyper(p, &newsize);
+		iap->ia_size = min_t(u64, newsize, NFS_OFFSET_MAX);
+	}
+	if ((tmp = ntohl(*p++)) == 1) {	/* set to server time */
+		iap->ia_valid |= ATTR_ATIME;
+	} else if (tmp == 2) {		/* set to client time */
+		iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
+		iap->ia_atime.tv_sec = ntohl(*p++);
+		iap->ia_atime.tv_nsec = ntohl(*p++);
+	}
+	if ((tmp = ntohl(*p++)) == 1) {	/* set to server time */
+		iap->ia_valid |= ATTR_MTIME;
+	} else if (tmp == 2) {		/* set to client time */
+		iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
+		iap->ia_mtime.tv_sec = ntohl(*p++);
+		iap->ia_mtime.tv_nsec = ntohl(*p++);
+	}
+	return p;
+}
+
+static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp)
+{
+	u64 f;
+	switch(fsid_source(fhp)) {
+	default:
+	case FSIDSOURCE_DEV:
+		p = xdr_encode_hyper(p, (u64)huge_encode_dev
+				     (fhp->fh_dentry->d_sb->s_dev));
+		break;
+	case FSIDSOURCE_FSID:
+		p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
+		break;
+	case FSIDSOURCE_UUID:
+		f = ((u64*)fhp->fh_export->ex_uuid)[0];
+		f ^= ((u64*)fhp->fh_export->ex_uuid)[1];
+		p = xdr_encode_hyper(p, f);
+		break;
+	}
+	return p;
+}
+
+static __be32 *
+encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
+	      struct kstat *stat)
+{
+	struct user_namespace *userns = nfsd_user_namespace(rqstp);
+	*p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
+	*p++ = htonl((u32) (stat->mode & S_IALLUGO));
+	*p++ = htonl((u32) stat->nlink);
+	*p++ = htonl((u32) from_kuid_munged(userns, stat->uid));
+	*p++ = htonl((u32) from_kgid_munged(userns, stat->gid));
+	if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) {
+		p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
+	} else {
+		p = xdr_encode_hyper(p, (u64) stat->size);
+	}
+	p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
+	*p++ = htonl((u32) MAJOR(stat->rdev));
+	*p++ = htonl((u32) MINOR(stat->rdev));
+	p = encode_fsid(p, fhp);
+	p = xdr_encode_hyper(p, stat->ino);
+	p = encode_time3(p, &stat->atime);
+	p = encode_time3(p, &stat->mtime);
+	p = encode_time3(p, &stat->ctime);
+
+	return p;
+}
+
+static __be32 *
+encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
+{
+	/* Attributes to follow */
+	*p++ = xdr_one;
+	return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr);
+}
+
+/*
+ * Encode post-operation attributes.
+ * The inode may be NULL if the call failed because of a stale file
+ * handle. In this case, no attributes are returned.
+ */
+static __be32 *
+encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
+{
+	struct dentry *dentry = fhp->fh_dentry;
+	if (dentry && d_really_is_positive(dentry)) {
+	        __be32 err;
+		struct kstat stat;
+
+		err = fh_getattr(fhp, &stat);
+		if (!err) {
+			*p++ = xdr_one;		/* attributes follow */
+			lease_get_mtime(d_inode(dentry), &stat.mtime);
+			return encode_fattr3(rqstp, p, fhp, &stat);
+		}
+	}
+	*p++ = xdr_zero;
+	return p;
+}
+
+/* Helper for NFSv3 ACLs */
+__be32 *
+nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
+{
+	return encode_post_op_attr(rqstp, p, fhp);
+}
+
+/*
+ * Enocde weak cache consistency data
+ */
+static __be32 *
+encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
+{
+	struct dentry	*dentry = fhp->fh_dentry;
+
+	if (dentry && d_really_is_positive(dentry) && fhp->fh_post_saved) {
+		if (fhp->fh_pre_saved) {
+			*p++ = xdr_one;
+			p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
+			p = encode_time3(p, &fhp->fh_pre_mtime);
+			p = encode_time3(p, &fhp->fh_pre_ctime);
+		} else {
+			*p++ = xdr_zero;
+		}
+		return encode_saved_post_attr(rqstp, p, fhp);
+	}
+	/* no pre- or post-attrs */
+	*p++ = xdr_zero;
+	return encode_post_op_attr(rqstp, p, fhp);
+}
+
+/*
+ * Fill in the pre_op attr for the wcc data
+ */
+void fill_pre_wcc(struct svc_fh *fhp)
+{
+	struct inode    *inode;
+	struct kstat	stat;
+	__be32 err;
+
+	if (fhp->fh_pre_saved)
+		return;
+
+	inode = d_inode(fhp->fh_dentry);
+	err = fh_getattr(fhp, &stat);
+	if (err) {
+		/* Grab the times from inode anyway */
+		stat.mtime = inode->i_mtime;
+		stat.ctime = inode->i_ctime;
+		stat.size  = inode->i_size;
+	}
+
+	fhp->fh_pre_mtime = stat.mtime;
+	fhp->fh_pre_ctime = stat.ctime;
+	fhp->fh_pre_size  = stat.size;
+	fhp->fh_pre_change = nfsd4_change_attribute(&stat, inode);
+	fhp->fh_pre_saved = true;
+}
+
+/*
+ * Fill in the post_op attr for the wcc data
+ */
+void fill_post_wcc(struct svc_fh *fhp)
+{
+	__be32 err;
+
+	if (fhp->fh_post_saved)
+		printk("nfsd: inode locked twice during operation.\n");
+
+	err = fh_getattr(fhp, &fhp->fh_post_attr);
+	fhp->fh_post_change = nfsd4_change_attribute(&fhp->fh_post_attr,
+						     d_inode(fhp->fh_dentry));
+	if (err) {
+		fhp->fh_post_saved = false;
+		/* Grab the ctime anyway - set_change_info might use it */
+		fhp->fh_post_attr.ctime = d_inode(fhp->fh_dentry)->i_ctime;
+	} else
+		fhp->fh_post_saved = true;
+}
+
+/*
+ * XDR decode functions
+ */
+int
+nfs3svc_decode_voidarg(struct svc_rqst *rqstp, __be32 *p)
+{
+	return 1;
+}
+
+int
+nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd_fhandle *args = rqstp->rq_argp;
+
+	p = decode_fh(p, &args->fh);
+	if (!p)
+		return 0;
+	return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_sattrargs *args = rqstp->rq_argp;
+
+	p = decode_fh(p, &args->fh);
+	if (!p)
+		return 0;
+	p = decode_sattr3(p, &args->attrs, nfsd_user_namespace(rqstp));
+
+	if ((args->check_guard = ntohl(*p++)) != 0) { 
+		struct timespec64 time;
+		p = decode_time3(p, &time);
+		args->guardtime = time.tv_sec;
+	}
+
+	return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_diropargs *args = rqstp->rq_argp;
+
+	if (!(p = decode_fh(p, &args->fh))
+	 || !(p = decode_filename(p, &args->name, &args->len)))
+		return 0;
+
+	return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_accessargs *args = rqstp->rq_argp;
+
+	p = decode_fh(p, &args->fh);
+	if (!p)
+		return 0;
+	args->access = ntohl(*p++);
+
+	return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_readargs *args = rqstp->rq_argp;
+	unsigned int len;
+	int v;
+	u32 max_blocksize = svc_max_payload(rqstp);
+
+	p = decode_fh(p, &args->fh);
+	if (!p)
+		return 0;
+	p = xdr_decode_hyper(p, &args->offset);
+
+	args->count = ntohl(*p++);
+	len = min(args->count, max_blocksize);
+
+	/* set up the kvec */
+	v=0;
+	while (len > 0) {
+		struct page *p = *(rqstp->rq_next_page++);
+
+		rqstp->rq_vec[v].iov_base = page_address(p);
+		rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
+		len -= rqstp->rq_vec[v].iov_len;
+		v++;
+	}
+	args->vlen = v;
+	return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_writeargs *args = rqstp->rq_argp;
+	unsigned int len, hdr, dlen;
+	u32 max_blocksize = svc_max_payload(rqstp);
+	struct kvec *head = rqstp->rq_arg.head;
+	struct kvec *tail = rqstp->rq_arg.tail;
+
+	p = decode_fh(p, &args->fh);
+	if (!p)
+		return 0;
+	p = xdr_decode_hyper(p, &args->offset);
+
+	args->count = ntohl(*p++);
+	args->stable = ntohl(*p++);
+	len = args->len = ntohl(*p++);
+	if ((void *)p > head->iov_base + head->iov_len)
+		return 0;
+	/*
+	 * The count must equal the amount of data passed.
+	 */
+	if (args->count != args->len)
+		return 0;
+
+	/*
+	 * Check to make sure that we got the right number of
+	 * bytes.
+	 */
+	hdr = (void*)p - head->iov_base;
+	dlen = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len - hdr;
+	/*
+	 * Round the length of the data which was specified up to
+	 * the next multiple of XDR units and then compare that
+	 * against the length which was actually received.
+	 * Note that when RPCSEC/GSS (for example) is used, the
+	 * data buffer can be padded so dlen might be larger
+	 * than required.  It must never be smaller.
+	 */
+	if (dlen < XDR_QUADLEN(len)*4)
+		return 0;
+
+	if (args->count > max_blocksize) {
+		args->count = max_blocksize;
+		len = args->len = max_blocksize;
+	}
+
+	args->first.iov_base = (void *)p;
+	args->first.iov_len = head->iov_len - hdr;
+	return 1;
+}
+
+int
+nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_createargs *args = rqstp->rq_argp;
+
+	if (!(p = decode_fh(p, &args->fh))
+	 || !(p = decode_filename(p, &args->name, &args->len)))
+		return 0;
+
+	switch (args->createmode = ntohl(*p++)) {
+	case NFS3_CREATE_UNCHECKED:
+	case NFS3_CREATE_GUARDED:
+		p = decode_sattr3(p, &args->attrs, nfsd_user_namespace(rqstp));
+		break;
+	case NFS3_CREATE_EXCLUSIVE:
+		args->verf = p;
+		p += 2;
+		break;
+	default:
+		return 0;
+	}
+
+	return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_createargs *args = rqstp->rq_argp;
+
+	if (!(p = decode_fh(p, &args->fh)) ||
+	    !(p = decode_filename(p, &args->name, &args->len)))
+		return 0;
+	p = decode_sattr3(p, &args->attrs, nfsd_user_namespace(rqstp));
+
+	return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_symlinkargs *args = rqstp->rq_argp;
+	char *base = (char *)p;
+	size_t dlen;
+
+	if (!(p = decode_fh(p, &args->ffh)) ||
+	    !(p = decode_filename(p, &args->fname, &args->flen)))
+		return 0;
+	p = decode_sattr3(p, &args->attrs, nfsd_user_namespace(rqstp));
+
+	args->tlen = ntohl(*p++);
+
+	args->first.iov_base = p;
+	args->first.iov_len = rqstp->rq_arg.head[0].iov_len;
+	args->first.iov_len -= (char *)p - base;
+
+	dlen = args->first.iov_len + rqstp->rq_arg.page_len +
+	       rqstp->rq_arg.tail[0].iov_len;
+	if (dlen < XDR_QUADLEN(args->tlen) << 2)
+		return 0;
+	return 1;
+}
+
+int
+nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_mknodargs *args = rqstp->rq_argp;
+
+	if (!(p = decode_fh(p, &args->fh))
+	 || !(p = decode_filename(p, &args->name, &args->len)))
+		return 0;
+
+	args->ftype = ntohl(*p++);
+
+	if (args->ftype == NF3BLK  || args->ftype == NF3CHR
+	 || args->ftype == NF3SOCK || args->ftype == NF3FIFO)
+		p = decode_sattr3(p, &args->attrs, nfsd_user_namespace(rqstp));
+
+	if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
+		args->major = ntohl(*p++);
+		args->minor = ntohl(*p++);
+	}
+
+	return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_renameargs *args = rqstp->rq_argp;
+
+	if (!(p = decode_fh(p, &args->ffh))
+	 || !(p = decode_filename(p, &args->fname, &args->flen))
+	 || !(p = decode_fh(p, &args->tfh))
+	 || !(p = decode_filename(p, &args->tname, &args->tlen)))
+		return 0;
+
+	return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_readlinkargs *args = rqstp->rq_argp;
+
+	p = decode_fh(p, &args->fh);
+	if (!p)
+		return 0;
+	args->buffer = page_address(*(rqstp->rq_next_page++));
+
+	return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_linkargs *args = rqstp->rq_argp;
+
+	if (!(p = decode_fh(p, &args->ffh))
+	 || !(p = decode_fh(p, &args->tfh))
+	 || !(p = decode_filename(p, &args->tname, &args->tlen)))
+		return 0;
+
+	return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_readdirargs *args = rqstp->rq_argp;
+	int len;
+	u32 max_blocksize = svc_max_payload(rqstp);
+
+	p = decode_fh(p, &args->fh);
+	if (!p)
+		return 0;
+	p = xdr_decode_hyper(p, &args->cookie);
+	args->verf   = p; p += 2;
+	args->dircount = ~0;
+	args->count  = ntohl(*p++);
+	len = args->count  = min_t(u32, args->count, max_blocksize);
+
+	while (len > 0) {
+		struct page *p = *(rqstp->rq_next_page++);
+		if (!args->buffer)
+			args->buffer = page_address(p);
+		len -= PAGE_SIZE;
+	}
+
+	return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_readdirargs *args = rqstp->rq_argp;
+	int len;
+	u32 max_blocksize = svc_max_payload(rqstp);
+
+	p = decode_fh(p, &args->fh);
+	if (!p)
+		return 0;
+	p = xdr_decode_hyper(p, &args->cookie);
+	args->verf     = p; p += 2;
+	args->dircount = ntohl(*p++);
+	args->count    = ntohl(*p++);
+
+	len = args->count = min(args->count, max_blocksize);
+	while (len > 0) {
+		struct page *p = *(rqstp->rq_next_page++);
+		if (!args->buffer)
+			args->buffer = page_address(p);
+		len -= PAGE_SIZE;
+	}
+
+	return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_commitargs *args = rqstp->rq_argp;
+	p = decode_fh(p, &args->fh);
+	if (!p)
+		return 0;
+	p = xdr_decode_hyper(p, &args->offset);
+	args->count = ntohl(*p++);
+
+	return xdr_argsize_check(rqstp, p);
+}
+
+/*
+ * XDR encode functions
+ */
+
+int
+nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
+{
+	return xdr_ressize_check(rqstp, p);
+}
+
+/* GETATTR */
+int
+nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_attrstat *resp = rqstp->rq_resp;
+
+	*p++ = resp->status;
+	if (resp->status == 0) {
+		lease_get_mtime(d_inode(resp->fh.fh_dentry),
+				&resp->stat.mtime);
+		p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
+	}
+	return xdr_ressize_check(rqstp, p);
+}
+
+/* SETATTR, REMOVE, RMDIR */
+int
+nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_attrstat *resp = rqstp->rq_resp;
+
+	*p++ = resp->status;
+	p = encode_wcc_data(rqstp, p, &resp->fh);
+	return xdr_ressize_check(rqstp, p);
+}
+
+/* LOOKUP */
+int
+nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_diropres *resp = rqstp->rq_resp;
+
+	*p++ = resp->status;
+	if (resp->status == 0) {
+		p = encode_fh(p, &resp->fh);
+		p = encode_post_op_attr(rqstp, p, &resp->fh);
+	}
+	p = encode_post_op_attr(rqstp, p, &resp->dirfh);
+	return xdr_ressize_check(rqstp, p);
+}
+
+/* ACCESS */
+int
+nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_accessres *resp = rqstp->rq_resp;
+
+	*p++ = resp->status;
+	p = encode_post_op_attr(rqstp, p, &resp->fh);
+	if (resp->status == 0)
+		*p++ = htonl(resp->access);
+	return xdr_ressize_check(rqstp, p);
+}
+
+/* READLINK */
+int
+nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_readlinkres *resp = rqstp->rq_resp;
+
+	*p++ = resp->status;
+	p = encode_post_op_attr(rqstp, p, &resp->fh);
+	if (resp->status == 0) {
+		*p++ = htonl(resp->len);
+		xdr_ressize_check(rqstp, p);
+		rqstp->rq_res.page_len = resp->len;
+		if (resp->len & 3) {
+			/* need to pad the tail */
+			rqstp->rq_res.tail[0].iov_base = p;
+			*p = 0;
+			rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
+		}
+		return 1;
+	} else
+		return xdr_ressize_check(rqstp, p);
+}
+
+/* READ */
+int
+nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_readres *resp = rqstp->rq_resp;
+
+	*p++ = resp->status;
+	p = encode_post_op_attr(rqstp, p, &resp->fh);
+	if (resp->status == 0) {
+		*p++ = htonl(resp->count);
+		*p++ = htonl(resp->eof);
+		*p++ = htonl(resp->count);	/* xdr opaque count */
+		xdr_ressize_check(rqstp, p);
+		/* now update rqstp->rq_res to reflect data as well */
+		rqstp->rq_res.page_len = resp->count;
+		if (resp->count & 3) {
+			/* need to pad the tail */
+			rqstp->rq_res.tail[0].iov_base = p;
+			*p = 0;
+			rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
+		}
+		return 1;
+	} else
+		return xdr_ressize_check(rqstp, p);
+}
+
+/* WRITE */
+int
+nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_writeres *resp = rqstp->rq_resp;
+
+	*p++ = resp->status;
+	p = encode_wcc_data(rqstp, p, &resp->fh);
+	if (resp->status == 0) {
+		*p++ = htonl(resp->count);
+		*p++ = htonl(resp->committed);
+		*p++ = resp->verf[0];
+		*p++ = resp->verf[1];
+	}
+	return xdr_ressize_check(rqstp, p);
+}
+
+/* CREATE, MKDIR, SYMLINK, MKNOD */
+int
+nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_diropres *resp = rqstp->rq_resp;
+
+	*p++ = resp->status;
+	if (resp->status == 0) {
+		*p++ = xdr_one;
+		p = encode_fh(p, &resp->fh);
+		p = encode_post_op_attr(rqstp, p, &resp->fh);
+	}
+	p = encode_wcc_data(rqstp, p, &resp->dirfh);
+	return xdr_ressize_check(rqstp, p);
+}
+
+/* RENAME */
+int
+nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_renameres *resp = rqstp->rq_resp;
+
+	*p++ = resp->status;
+	p = encode_wcc_data(rqstp, p, &resp->ffh);
+	p = encode_wcc_data(rqstp, p, &resp->tfh);
+	return xdr_ressize_check(rqstp, p);
+}
+
+/* LINK */
+int
+nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_linkres *resp = rqstp->rq_resp;
+
+	*p++ = resp->status;
+	p = encode_post_op_attr(rqstp, p, &resp->fh);
+	p = encode_wcc_data(rqstp, p, &resp->tfh);
+	return xdr_ressize_check(rqstp, p);
+}
+
+/* READDIR */
+int
+nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_readdirres *resp = rqstp->rq_resp;
+
+	*p++ = resp->status;
+	p = encode_post_op_attr(rqstp, p, &resp->fh);
+
+	if (resp->status == 0) {
+		/* stupid readdir cookie */
+		memcpy(p, resp->verf, 8); p += 2;
+		xdr_ressize_check(rqstp, p);
+		if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
+			return 1; /*No room for trailer */
+		rqstp->rq_res.page_len = (resp->count) << 2;
+
+		/* add the 'tail' to the end of the 'head' page - page 0. */
+		rqstp->rq_res.tail[0].iov_base = p;
+		*p++ = 0;		/* no more entries */
+		*p++ = htonl(resp->common.err == nfserr_eof);
+		rqstp->rq_res.tail[0].iov_len = 2<<2;
+		return 1;
+	} else
+		return xdr_ressize_check(rqstp, p);
+}
+
+static __be32 *
+encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
+	     int namlen, u64 ino)
+{
+	*p++ = xdr_one;				 /* mark entry present */
+	p    = xdr_encode_hyper(p, ino);	 /* file id */
+	p    = xdr_encode_array(p, name, namlen);/* name length & name */
+
+	cd->offset = p;				/* remember pointer */
+	p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
+
+	return p;
+}
+
+static __be32
+compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
+		 const char *name, int namlen, u64 ino)
+{
+	struct svc_export	*exp;
+	struct dentry		*dparent, *dchild;
+	__be32 rv = nfserr_noent;
+
+	dparent = cd->fh.fh_dentry;
+	exp  = cd->fh.fh_export;
+
+	if (isdotent(name, namlen)) {
+		if (namlen == 2) {
+			dchild = dget_parent(dparent);
+			/*
+			 * Don't return filehandle for ".." if we're at
+			 * the filesystem or export root:
+			 */
+			if (dchild == dparent)
+				goto out;
+			if (dparent == exp->ex_path.dentry)
+				goto out;
+		} else
+			dchild = dget(dparent);
+	} else
+		dchild = lookup_positive_unlocked(name, dparent, namlen);
+	if (IS_ERR(dchild))
+		return rv;
+	if (d_mountpoint(dchild))
+		goto out;
+	if (dchild->d_inode->i_ino != ino)
+		goto out;
+	rv = fh_compose(fhp, exp, dchild, &cd->fh);
+out:
+	dput(dchild);
+	return rv;
+}
+
+static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen, u64 ino)
+{
+	struct svc_fh	*fh = &cd->scratch;
+	__be32 err;
+
+	fh_init(fh, NFS3_FHSIZE);
+	err = compose_entry_fh(cd, fh, name, namlen, ino);
+	if (err) {
+		*p++ = 0;
+		*p++ = 0;
+		goto out;
+	}
+	p = encode_post_op_attr(cd->rqstp, p, fh);
+	*p++ = xdr_one;			/* yes, a file handle follows */
+	p = encode_fh(p, fh);
+out:
+	fh_put(fh);
+	return p;
+}
+
+/*
+ * Encode a directory entry. This one works for both normal readdir
+ * and readdirplus.
+ * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
+ * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
+ * 
+ * The readdirplus baggage is 1+21 words for post_op_attr, plus the
+ * file handle.
+ */
+
+#define NFS3_ENTRY_BAGGAGE	(2 + 1 + 2 + 1)
+#define NFS3_ENTRYPLUS_BAGGAGE	(1 + 21 + 1 + (NFS3_FHSIZE >> 2))
+static int
+encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
+	     loff_t offset, u64 ino, unsigned int d_type, int plus)
+{
+	struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
+		       					common);
+	__be32		*p = cd->buffer;
+	caddr_t		curr_page_addr = NULL;
+	struct page **	page;
+	int		slen;		/* string (name) length */
+	int		elen;		/* estimated entry length in words */
+	int		num_entry_words = 0;	/* actual number of words */
+
+	if (cd->offset) {
+		u64 offset64 = offset;
+
+		if (unlikely(cd->offset1)) {
+			/* we ended up with offset on a page boundary */
+			*cd->offset = htonl(offset64 >> 32);
+			*cd->offset1 = htonl(offset64 & 0xffffffff);
+			cd->offset1 = NULL;
+		} else {
+			xdr_encode_hyper(cd->offset, offset64);
+		}
+		cd->offset = NULL;
+	}
+
+	/*
+	dprintk("encode_entry(%.*s @%ld%s)\n",
+		namlen, name, (long) offset, plus? " plus" : "");
+	 */
+
+	/* truncate filename if too long */
+	namlen = min(namlen, NFS3_MAXNAMLEN);
+
+	slen = XDR_QUADLEN(namlen);
+	elen = slen + NFS3_ENTRY_BAGGAGE
+		+ (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
+
+	if (cd->buflen < elen) {
+		cd->common.err = nfserr_toosmall;
+		return -EINVAL;
+	}
+
+	/* determine which page in rq_respages[] we are currently filling */
+	for (page = cd->rqstp->rq_respages + 1;
+				page < cd->rqstp->rq_next_page; page++) {
+		curr_page_addr = page_address(*page);
+
+		if (((caddr_t)cd->buffer >= curr_page_addr) &&
+		    ((caddr_t)cd->buffer <  curr_page_addr + PAGE_SIZE))
+			break;
+	}
+
+	if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
+		/* encode entry in current page */
+
+		p = encode_entry_baggage(cd, p, name, namlen, ino);
+
+		if (plus)
+			p = encode_entryplus_baggage(cd, p, name, namlen, ino);
+		num_entry_words = p - cd->buffer;
+	} else if (*(page+1) != NULL) {
+		/* temporarily encode entry into next page, then move back to
+		 * current and next page in rq_respages[] */
+		__be32 *p1, *tmp;
+		int len1, len2;
+
+		/* grab next page for temporary storage of entry */
+		p1 = tmp = page_address(*(page+1));
+
+		p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
+
+		if (plus)
+			p1 = encode_entryplus_baggage(cd, p1, name, namlen, ino);
+
+		/* determine entry word length and lengths to go in pages */
+		num_entry_words = p1 - tmp;
+		len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
+		if ((num_entry_words << 2) < len1) {
+			/* the actual number of words in the entry is less
+			 * than elen and can still fit in the current page
+			 */
+			memmove(p, tmp, num_entry_words << 2);
+			p += num_entry_words;
+
+			/* update offset */
+			cd->offset = cd->buffer + (cd->offset - tmp);
+		} else {
+			unsigned int offset_r = (cd->offset - tmp) << 2;
+
+			/* update pointer to offset location.
+			 * This is a 64bit quantity, so we need to
+			 * deal with 3 cases:
+			 *  -	entirely in first page
+			 *  -	entirely in second page
+			 *  -	4 bytes in each page
+			 */
+			if (offset_r + 8 <= len1) {
+				cd->offset = p + (cd->offset - tmp);
+			} else if (offset_r >= len1) {
+				cd->offset -= len1 >> 2;
+			} else {
+				/* sitting on the fence */
+				BUG_ON(offset_r != len1 - 4);
+				cd->offset = p + (cd->offset - tmp);
+				cd->offset1 = tmp;
+			}
+
+			len2 = (num_entry_words << 2) - len1;
+
+			/* move from temp page to current and next pages */
+			memmove(p, tmp, len1);
+			memmove(tmp, (caddr_t)tmp+len1, len2);
+
+			p = tmp + (len2 >> 2);
+		}
+	}
+	else {
+		cd->common.err = nfserr_toosmall;
+		return -EINVAL;
+	}
+
+	cd->buflen -= num_entry_words;
+	cd->buffer = p;
+	cd->common.err = nfs_ok;
+	return 0;
+
+}
+
+int
+nfs3svc_encode_entry(void *cd, const char *name,
+		     int namlen, loff_t offset, u64 ino, unsigned int d_type)
+{
+	return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
+}
+
+int
+nfs3svc_encode_entry_plus(void *cd, const char *name,
+			  int namlen, loff_t offset, u64 ino,
+			  unsigned int d_type)
+{
+	return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
+}
+
+/* FSSTAT */
+int
+nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_fsstatres *resp = rqstp->rq_resp;
+	struct kstatfs	*s = &resp->stats;
+	u64		bs = s->f_bsize;
+
+	*p++ = resp->status;
+	*p++ = xdr_zero;	/* no post_op_attr */
+
+	if (resp->status == 0) {
+		p = xdr_encode_hyper(p, bs * s->f_blocks);	/* total bytes */
+		p = xdr_encode_hyper(p, bs * s->f_bfree);	/* free bytes */
+		p = xdr_encode_hyper(p, bs * s->f_bavail);	/* user available bytes */
+		p = xdr_encode_hyper(p, s->f_files);	/* total inodes */
+		p = xdr_encode_hyper(p, s->f_ffree);	/* free inodes */
+		p = xdr_encode_hyper(p, s->f_ffree);	/* user available inodes */
+		*p++ = htonl(resp->invarsec);	/* mean unchanged time */
+	}
+	return xdr_ressize_check(rqstp, p);
+}
+
+/* FSINFO */
+int
+nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_fsinfores *resp = rqstp->rq_resp;
+
+	*p++ = resp->status;
+	*p++ = xdr_zero;	/* no post_op_attr */
+
+	if (resp->status == 0) {
+		*p++ = htonl(resp->f_rtmax);
+		*p++ = htonl(resp->f_rtpref);
+		*p++ = htonl(resp->f_rtmult);
+		*p++ = htonl(resp->f_wtmax);
+		*p++ = htonl(resp->f_wtpref);
+		*p++ = htonl(resp->f_wtmult);
+		*p++ = htonl(resp->f_dtpref);
+		p = xdr_encode_hyper(p, resp->f_maxfilesize);
+		*p++ = xdr_one;
+		*p++ = xdr_zero;
+		*p++ = htonl(resp->f_properties);
+	}
+
+	return xdr_ressize_check(rqstp, p);
+}
+
+/* PATHCONF */
+int
+nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_pathconfres *resp = rqstp->rq_resp;
+
+	*p++ = resp->status;
+	*p++ = xdr_zero;	/* no post_op_attr */
+
+	if (resp->status == 0) {
+		*p++ = htonl(resp->p_link_max);
+		*p++ = htonl(resp->p_name_max);
+		*p++ = htonl(resp->p_no_trunc);
+		*p++ = htonl(resp->p_chown_restricted);
+		*p++ = htonl(resp->p_case_insensitive);
+		*p++ = htonl(resp->p_case_preserving);
+	}
+
+	return xdr_ressize_check(rqstp, p);
+}
+
+/* COMMIT */
+int
+nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_commitres *resp = rqstp->rq_resp;
+
+	*p++ = resp->status;
+	p = encode_wcc_data(rqstp, p, &resp->fh);
+	/* Write verifier */
+	if (resp->status == 0) {
+		*p++ = resp->verf[0];
+		*p++ = resp->verf[1];
+	}
+	return xdr_ressize_check(rqstp, p);
+}
+
+/*
+ * XDR release functions
+ */
+void
+nfs3svc_release_fhandle(struct svc_rqst *rqstp)
+{
+	struct nfsd3_attrstat *resp = rqstp->rq_resp;
+
+	fh_put(&resp->fh);
+}
+
+void
+nfs3svc_release_fhandle2(struct svc_rqst *rqstp)
+{
+	struct nfsd3_fhandle_pair *resp = rqstp->rq_resp;
+
+	fh_put(&resp->fh1);
+	fh_put(&resp->fh2);
+}