[mirror_ubuntu-jammy-kernel.git] / fs / nfsd / nfsxdr.c

// SPDX-License-Identifier: GPL-2.0
/*
 * XDR support for nfsd
 *
 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
 */

#include "vfs.h"
#include "xdr.h"
#include "auth.h"

/*
 * Mapping of S_IF* types to NFS file types
 */
static const u32 nfs_ftypes[] = {
	NFNON,  NFCHR,  NFCHR, NFBAD,
	NFDIR,  NFBAD,  NFBLK, NFBAD,
	NFREG,  NFBAD,  NFLNK, NFBAD,
	NFSOCK, NFBAD,  NFLNK, NFBAD,
};


/*
 * Basic NFSv2 data types (RFC 1094 Section 2.3)
 */

/**
 * svcxdr_encode_stat - Encode an NFSv2 status code
 * @xdr: XDR stream
 * @status: status value to encode
 *
 * Return values:
 *   %false: Send buffer space was exhausted
 *   %true: Success
 */
bool
svcxdr_encode_stat(struct xdr_stream *xdr, __be32 status)
{
	__be32 *p;

	p = xdr_reserve_space(xdr, sizeof(status));
	if (!p)
		return false;
	*p = status;

	return true;
}

/**
 * svcxdr_decode_fhandle - Decode an NFSv2 file handle
 * @xdr: XDR stream positioned at an encoded NFSv2 FH
 * @fhp: OUT: filled-in server file handle
 *
 * Return values:
 *  %false: The encoded file handle was not valid
 *  %true: @fhp has been initialized
 */
bool
svcxdr_decode_fhandle(struct xdr_stream *xdr, struct svc_fh *fhp)
{
	__be32 *p;

	p = xdr_inline_decode(xdr, NFS_FHSIZE);
	if (!p)
		return false;
	fh_init(fhp, NFS_FHSIZE);
	memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE);
	fhp->fh_handle.fh_size = NFS_FHSIZE;

	return true;
}

static bool
svcxdr_encode_fhandle(struct xdr_stream *xdr, const struct svc_fh *fhp)
{
	__be32 *p;

	p = xdr_reserve_space(xdr, NFS_FHSIZE);
	if (!p)
		return false;
	memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE);

	return true;
}

static __be32 *
encode_timeval(__be32 *p, const struct timespec64 *time)
{
	*p++ = cpu_to_be32((u32)time->tv_sec);
	if (time->tv_nsec)
		*p++ = cpu_to_be32(time->tv_nsec / NSEC_PER_USEC);
	else
		*p++ = xdr_zero;
	return p;
}

static bool
svcxdr_decode_filename(struct xdr_stream *xdr, char **name, unsigned int *len)
{
	u32 size, i;
	__be32 *p;
	char *c;

	if (xdr_stream_decode_u32(xdr, &size) < 0)
		return false;
	if (size == 0 || size > NFS_MAXNAMLEN)
		return false;
	p = xdr_inline_decode(xdr, size);
	if (!p)
		return false;

	*len = size;
	*name = (char *)p;
	for (i = 0, c = *name; i < size; i++, c++)
		if (*c == '\0' || *c == '/')
			return false;

	return true;
}

static bool
svcxdr_decode_diropargs(struct xdr_stream *xdr, struct svc_fh *fhp,
			char **name, unsigned int *len)
{
	return svcxdr_decode_fhandle(xdr, fhp) &&
		svcxdr_decode_filename(xdr, name, len);
}

static bool
svcxdr_decode_sattr(struct svc_rqst *rqstp, struct xdr_stream *xdr,
		    struct iattr *iap)
{
	u32 tmp1, tmp2;
	__be32 *p;

	p = xdr_inline_decode(xdr, XDR_UNIT * 8);
	if (!p)
		return false;

	iap->ia_valid = 0;

	/*
	 * Some Sun clients put 0xffff in the mode field when they
	 * mean 0xffffffff.
	 */
	tmp1 = be32_to_cpup(p++);
	if (tmp1 != (u32)-1 && tmp1 != 0xffff) {
		iap->ia_valid |= ATTR_MODE;
		iap->ia_mode = tmp1;
	}

	tmp1 = be32_to_cpup(p++);
	if (tmp1 != (u32)-1) {
		iap->ia_uid = make_kuid(nfsd_user_namespace(rqstp), tmp1);
		if (uid_valid(iap->ia_uid))
			iap->ia_valid |= ATTR_UID;
	}

	tmp1 = be32_to_cpup(p++);
	if (tmp1 != (u32)-1) {
		iap->ia_gid = make_kgid(nfsd_user_namespace(rqstp), tmp1);
		if (gid_valid(iap->ia_gid))
			iap->ia_valid |= ATTR_GID;
	}

	tmp1 = be32_to_cpup(p++);
	if (tmp1 != (u32)-1) {
		iap->ia_valid |= ATTR_SIZE;
		iap->ia_size = tmp1;
	}

	tmp1 = be32_to_cpup(p++);
	tmp2 = be32_to_cpup(p++);
	if (tmp1 != (u32)-1 && tmp2 != (u32)-1) {
		iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
		iap->ia_atime.tv_sec = tmp1;
		iap->ia_atime.tv_nsec = tmp2 * NSEC_PER_USEC;
	}

	tmp1 = be32_to_cpup(p++);
	tmp2 = be32_to_cpup(p++);
	if (tmp1 != (u32)-1 && tmp2 != (u32)-1) {
		iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
		iap->ia_mtime.tv_sec = tmp1;
		iap->ia_mtime.tv_nsec = tmp2 * NSEC_PER_USEC;
		/*
		 * Passing the invalid value useconds=1000000 for mtime
		 * is a Sun convention for "set both mtime and atime to
		 * current server time".  It's needed to make permissions
		 * checks for the "touch" program across v2 mounts to
		 * Solaris and Irix boxes work correctly. See description of
		 * sattr in section 6.1 of "NFS Illustrated" by
		 * Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5
		 */
		if (tmp2 == 1000000)
			iap->ia_valid &= ~(ATTR_ATIME_SET|ATTR_MTIME_SET);
	}

	return true;
}

/**
 * svcxdr_encode_fattr - Encode NFSv2 file attributes
 * @rqstp: Context of a completed RPC transaction
 * @xdr: XDR stream
 * @fhp: File handle to encode
 * @stat: Attributes to encode
 *
 * Return values:
 *   %false: Send buffer space was exhausted
 *   %true: Success
 */
bool
svcxdr_encode_fattr(struct svc_rqst *rqstp, struct xdr_stream *xdr,
		    const struct svc_fh *fhp, const struct kstat *stat)
{
	struct user_namespace *userns = nfsd_user_namespace(rqstp);
	struct dentry *dentry = fhp->fh_dentry;
	int type = stat->mode & S_IFMT;
	struct timespec64 time;
	__be32 *p;
	u32 fsid;

	p = xdr_reserve_space(xdr, XDR_UNIT * 17);
	if (!p)
		return false;

	*p++ = cpu_to_be32(nfs_ftypes[type >> 12]);
	*p++ = cpu_to_be32((u32)stat->mode);
	*p++ = cpu_to_be32((u32)stat->nlink);
	*p++ = cpu_to_be32((u32)from_kuid_munged(userns, stat->uid));
	*p++ = cpu_to_be32((u32)from_kgid_munged(userns, stat->gid));

	if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN)
		*p++ = cpu_to_be32(NFS_MAXPATHLEN);
	else
		*p++ = cpu_to_be32((u32) stat->size);
	*p++ = cpu_to_be32((u32) stat->blksize);
	if (S_ISCHR(type) || S_ISBLK(type))
		*p++ = cpu_to_be32(new_encode_dev(stat->rdev));
	else
		*p++ = cpu_to_be32(0xffffffff);
	*p++ = cpu_to_be32((u32)stat->blocks);

	switch (fsid_source(fhp)) {
	case FSIDSOURCE_FSID:
		fsid = (u32)fhp->fh_export->ex_fsid;
		break;
	case FSIDSOURCE_UUID:
		fsid = ((u32 *)fhp->fh_export->ex_uuid)[0];
		fsid ^= ((u32 *)fhp->fh_export->ex_uuid)[1];
		fsid ^= ((u32 *)fhp->fh_export->ex_uuid)[2];
		fsid ^= ((u32 *)fhp->fh_export->ex_uuid)[3];
		break;
	default:
		fsid = new_encode_dev(stat->dev);
		break;
	}
	*p++ = cpu_to_be32(fsid);

	*p++ = cpu_to_be32((u32)stat->ino);
	p = encode_timeval(p, &stat->atime);
	time = stat->mtime;
	lease_get_mtime(d_inode(dentry), &time);
	p = encode_timeval(p, &time);
	encode_timeval(p, &stat->ctime);

	return true;
}

/*
 * XDR decode functions
 */

int
nfssvc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p)
{
	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
	struct nfsd_fhandle *args = rqstp->rq_argp;

	return svcxdr_decode_fhandle(xdr, &args->fh);
}

int
nfssvc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p)
{
	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
	struct nfsd_sattrargs *args = rqstp->rq_argp;

	return svcxdr_decode_fhandle(xdr, &args->fh) &&
		svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
}

int
nfssvc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p)
{
	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
	struct nfsd_diropargs *args = rqstp->rq_argp;

	return svcxdr_decode_diropargs(xdr, &args->fh, &args->name, &args->len);
}

int
nfssvc_decode_readargs(struct svc_rqst *rqstp, __be32 *p)
{
	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
	struct nfsd_readargs *args = rqstp->rq_argp;
	u32 totalcount;

	if (!svcxdr_decode_fhandle(xdr, &args->fh))
		return 0;
	if (xdr_stream_decode_u32(xdr, &args->offset) < 0)
		return 0;
	if (xdr_stream_decode_u32(xdr, &args->count) < 0)
		return 0;
	/* totalcount is ignored */
	if (xdr_stream_decode_u32(xdr, &totalcount) < 0)
		return 0;

	return 1;
}

int
nfssvc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p)
{
	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
	struct nfsd_writeargs *args = rqstp->rq_argp;
	struct kvec *head = rqstp->rq_arg.head;
	struct kvec *tail = rqstp->rq_arg.tail;
	u32 beginoffset, totalcount;
	size_t remaining;

	if (!svcxdr_decode_fhandle(xdr, &args->fh))
		return 0;
	/* beginoffset is ignored */
	if (xdr_stream_decode_u32(xdr, &beginoffset) < 0)
		return 0;
	if (xdr_stream_decode_u32(xdr, &args->offset) < 0)
		return 0;
	/* totalcount is ignored */
	if (xdr_stream_decode_u32(xdr, &totalcount) < 0)
		return 0;

	/* opaque data */
	if (xdr_stream_decode_u32(xdr, &args->len) < 0)
		return 0;
	if (args->len > NFSSVC_MAXBLKSIZE_V2)
		return 0;
	remaining = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len;
	remaining -= xdr_stream_pos(xdr);
	if (remaining < xdr_align_size(args->len))
		return 0;
	args->first.iov_base = xdr->p;
	args->first.iov_len = head->iov_len - xdr_stream_pos(xdr);

	return 1;
}

int
nfssvc_decode_createargs(struct svc_rqst *rqstp, __be32 *p)
{
	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
	struct nfsd_createargs *args = rqstp->rq_argp;

	return svcxdr_decode_diropargs(xdr, &args->fh,
				       &args->name, &args->len) &&
		svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
}

int
nfssvc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p)
{
	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
	struct nfsd_renameargs *args = rqstp->rq_argp;

	return svcxdr_decode_diropargs(xdr, &args->ffh,
				       &args->fname, &args->flen) &&
		svcxdr_decode_diropargs(xdr, &args->tfh,
					&args->tname, &args->tlen);
}

int
nfssvc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p)
{
	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
	struct nfsd_linkargs *args = rqstp->rq_argp;

	return svcxdr_decode_fhandle(xdr, &args->ffh) &&
		svcxdr_decode_diropargs(xdr, &args->tfh,
					&args->tname, &args->tlen);
}

int
nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p)
{
	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
	struct nfsd_symlinkargs *args = rqstp->rq_argp;
	struct kvec *head = rqstp->rq_arg.head;

	if (!svcxdr_decode_diropargs(xdr, &args->ffh, &args->fname, &args->flen))
		return 0;
	if (xdr_stream_decode_u32(xdr, &args->tlen) < 0)
		return 0;
	if (args->tlen == 0)
		return 0;

	args->first.iov_len = head->iov_len - xdr_stream_pos(xdr);
	args->first.iov_base = xdr_inline_decode(xdr, args->tlen);
	if (!args->first.iov_base)
		return 0;
	return svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
}

int
nfssvc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p)
{
	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
	struct nfsd_readdirargs *args = rqstp->rq_argp;

	if (!svcxdr_decode_fhandle(xdr, &args->fh))
		return 0;
	if (xdr_stream_decode_u32(xdr, &args->cookie) < 0)
		return 0;
	if (xdr_stream_decode_u32(xdr, &args->count) < 0)
		return 0;

	return 1;
}

/*
 * XDR encode functions
 */

int
nfssvc_encode_statres(struct svc_rqst *rqstp, __be32 *p)
{
	struct xdr_stream *xdr = &rqstp->rq_res_stream;
	struct nfsd_stat *resp = rqstp->rq_resp;

	return svcxdr_encode_stat(xdr, resp->status);
}

int
nfssvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p)
{
	struct xdr_stream *xdr = &rqstp->rq_res_stream;
	struct nfsd_attrstat *resp = rqstp->rq_resp;

	if (!svcxdr_encode_stat(xdr, resp->status))
		return 0;
	switch (resp->status) {
	case nfs_ok:
		if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
			return 0;
		break;
	}

	return 1;
}

int
nfssvc_encode_diropres(struct svc_rqst *rqstp, __be32 *p)
{
	struct xdr_stream *xdr = &rqstp->rq_res_stream;
	struct nfsd_diropres *resp = rqstp->rq_resp;

	if (!svcxdr_encode_stat(xdr, resp->status))
		return 0;
	switch (resp->status) {
	case nfs_ok:
		if (!svcxdr_encode_fhandle(xdr, &resp->fh))
			return 0;
		if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
			return 0;
		break;
	}

	return 1;
}

int
nfssvc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p)
{
	struct xdr_stream *xdr = &rqstp->rq_res_stream;
	struct nfsd_readlinkres *resp = rqstp->rq_resp;
	struct kvec *head = rqstp->rq_res.head;

	if (!svcxdr_encode_stat(xdr, resp->status))
		return 0;
	switch (resp->status) {
	case nfs_ok:
		if (xdr_stream_encode_u32(xdr, resp->len) < 0)
			return 0;
		xdr_write_pages(xdr, &resp->page, 0, resp->len);
		if (svc_encode_result_payload(rqstp, head->iov_len, resp->len) < 0)
			return 0;
		break;
	}

	return 1;
}

int
nfssvc_encode_readres(struct svc_rqst *rqstp, __be32 *p)
{
	struct xdr_stream *xdr = &rqstp->rq_res_stream;
	struct nfsd_readres *resp = rqstp->rq_resp;
	struct kvec *head = rqstp->rq_res.head;

	if (!svcxdr_encode_stat(xdr, resp->status))
		return 0;
	switch (resp->status) {
	case nfs_ok:
		if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
			return 0;
		if (xdr_stream_encode_u32(xdr, resp->count) < 0)
			return 0;
		xdr_write_pages(xdr, resp->pages, rqstp->rq_res.page_base,
				resp->count);
		if (svc_encode_result_payload(rqstp, head->iov_len, resp->count) < 0)
			return 0;
		break;
	}

	return 1;
}

int
nfssvc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p)
{
	struct xdr_stream *xdr = &rqstp->rq_res_stream;
	struct nfsd_readdirres *resp = rqstp->rq_resp;
	struct xdr_buf *dirlist = &resp->dirlist;

	if (!svcxdr_encode_stat(xdr, resp->status))
		return 0;
	switch (resp->status) {
	case nfs_ok:
		xdr_write_pages(xdr, dirlist->pages, 0, dirlist->len);
		/* no more entries */
		if (xdr_stream_encode_item_absent(xdr) < 0)
			return 0;
		if (xdr_stream_encode_bool(xdr, resp->common.err == nfserr_eof) < 0)
			return 0;
		break;
	}

	return 1;
}

int
nfssvc_encode_statfsres(struct svc_rqst *rqstp, __be32 *p)
{
	struct xdr_stream *xdr = &rqstp->rq_res_stream;
	struct nfsd_statfsres *resp = rqstp->rq_resp;
	struct kstatfs	*stat = &resp->stats;

	if (!svcxdr_encode_stat(xdr, resp->status))
		return 0;
	switch (resp->status) {
	case nfs_ok:
		p = xdr_reserve_space(xdr, XDR_UNIT * 5);
		if (!p)
			return 0;
		*p++ = cpu_to_be32(NFSSVC_MAXBLKSIZE_V2);
		*p++ = cpu_to_be32(stat->f_bsize);
		*p++ = cpu_to_be32(stat->f_blocks);
		*p++ = cpu_to_be32(stat->f_bfree);
		*p = cpu_to_be32(stat->f_bavail);
		break;
	}

	return 1;
}

/**
 * nfssvc_encode_nfscookie - Encode a directory offset cookie
 * @resp: readdir result context
 * @offset: offset cookie to encode
 *
 * The buffer space for the offset cookie has already been reserved
 * by svcxdr_encode_entry_common().
 */
void nfssvc_encode_nfscookie(struct nfsd_readdirres *resp, u32 offset)
{
	__be32 cookie = cpu_to_be32(offset);

	if (!resp->cookie_offset)
		return;

	write_bytes_to_xdr_buf(&resp->dirlist, resp->cookie_offset, &cookie,
			       sizeof(cookie));
	resp->cookie_offset = 0;
}

static bool
svcxdr_encode_entry_common(struct nfsd_readdirres *resp, const char *name,
			   int namlen, loff_t offset, u64 ino)
{
	struct xdr_buf *dirlist = &resp->dirlist;
	struct xdr_stream *xdr = &resp->xdr;

	if (xdr_stream_encode_item_present(xdr) < 0)
		return false;
	/* fileid */
	if (xdr_stream_encode_u32(xdr, (u32)ino) < 0)
		return false;
	/* name */
	if (xdr_stream_encode_opaque(xdr, name, min(namlen, NFS2_MAXNAMLEN)) < 0)
		return false;
	/* cookie */
	resp->cookie_offset = dirlist->len;
	if (xdr_stream_encode_u32(xdr, ~0U) < 0)
		return false;

	return true;
}

/**
 * nfssvc_encode_entry - encode one NFSv2 READDIR entry
 * @data: directory context
 * @name: name of the object to be encoded
 * @namlen: length of that name, in bytes
 * @offset: the offset of the previous entry
 * @ino: the fileid of this entry
 * @d_type: unused
 *
 * Return values:
 *   %0: Entry was successfully encoded.
 *   %-EINVAL: An encoding problem occured, secondary status code in resp->common.err
 *
 * On exit, the following fields are updated:
 *   - resp->xdr
 *   - resp->common.err
 *   - resp->cookie_offset
 */
int nfssvc_encode_entry(void *data, const char *name, int namlen,
			loff_t offset, u64 ino, unsigned int d_type)
{
	struct readdir_cd *ccd = data;
	struct nfsd_readdirres *resp = container_of(ccd,
						    struct nfsd_readdirres,
						    common);
	unsigned int starting_length = resp->dirlist.len;

	/* The offset cookie for the previous entry */
	nfssvc_encode_nfscookie(resp, offset);

	if (!svcxdr_encode_entry_common(resp, name, namlen, offset, ino))
		goto out_toosmall;

	xdr_commit_encode(&resp->xdr);
	resp->common.err = nfs_ok;
	return 0;

out_toosmall:
	resp->cookie_offset = 0;
	resp->common.err = nfserr_toosmall;
	resp->dirlist.len = starting_length;
	return -EINVAL;
}

/*
 * XDR release functions
 */
void nfssvc_release_attrstat(struct svc_rqst *rqstp)
{
	struct nfsd_attrstat *resp = rqstp->rq_resp;

	fh_put(&resp->fh);
}

void nfssvc_release_diropres(struct svc_rqst *rqstp)
{
	struct nfsd_diropres *resp = rqstp->rq_resp;

	fh_put(&resp->fh);
}

void nfssvc_release_readres(struct svc_rqst *rqstp)
{
	struct nfsd_readres *resp = rqstp->rq_resp;

	fh_put(&resp->fh);
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4	2	/*
1da177e4 LT	3	* XDR support for nfsd
	4	*
	5	* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
	6	*/
	7
3dadecce	8	#include "vfs.h"
9a74af21	9	#include "xdr.h"
2e8138a2	10	#include "auth.h"
1da177e4	11
1da177e4 LT	12	/*
	13	* Mapping of S_IF* types to NFS file types
	14	*/
92b54a4f	15	static const u32 nfs_ftypes[] = {
1da177e4 LT	16	NFNON, NFCHR, NFCHR, NFBAD,
	17	NFDIR, NFBAD, NFBLK, NFBAD,
	18	NFREG, NFBAD, NFLNK, NFBAD,
	19	NFSOCK, NFBAD, NFLNK, NFBAD,
	20	};
	21
	22
	23	/*
ebcd8e8b	24	* Basic NFSv2 data types (RFC 1094 Section 2.3)
1da177e4	25	*/
ebcd8e8b	26
f8cba473 CL	27	/**
	28	* svcxdr_encode_stat - Encode an NFSv2 status code
	29	* @xdr: XDR stream
	30	* @status: status value to encode
	31	*
	32	* Return values:
	33	* %false: Send buffer space was exhausted
	34	* %true: Success
	35	*/
	36	bool
a887eaed CL	37	svcxdr_encode_stat(struct xdr_stream *xdr, __be32 status)
	38	{
	39	__be32 *p;
	40
	41	p = xdr_reserve_space(xdr, sizeof(status));
	42	if (!p)
	43	return false;
	44	*p = status;
	45
	46	return true;
	47	}
	48
635a45d3 CL	49	/**
	50	* svcxdr_decode_fhandle - Decode an NFSv2 file handle
	51	* @xdr: XDR stream positioned at an encoded NFSv2 FH
	52	* @fhp: OUT: filled-in server file handle
	53	*
	54	* Return values:
	55	* %false: The encoded file handle was not valid
	56	* %true: @fhp has been initialized
	57	*/
	58	bool
ebcd8e8b CL	59	svcxdr_decode_fhandle(struct xdr_stream xdr, struct svc_fh fhp)
	60	{
	61	__be32 *p;
	62
	63	p = xdr_inline_decode(xdr, NFS_FHSIZE);
	64	if (!p)
	65	return false;
	66	fh_init(fhp, NFS_FHSIZE);
	67	memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE);
	68	fhp->fh_handle.fh_size = NFS_FHSIZE;
	69
	70	return true;
	71	}
	72
e3b4ef22 CL	73	static bool
e3b4ef22 CL	74	svcxdr_encode_fhandle(struct xdr_stream xdr, const struct svc_fh fhp)
1da177e4	75	{
e3b4ef22 CL	76	__be32 *p;
	77
	78	p = xdr_reserve_space(xdr, NFS_FHSIZE);
	79	if (!p)
	80	return false;
1da177e4	81	memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE);
e3b4ef22 CL	82
e3b4ef22 CL	83	return true;
1da177e4 LT	84	}
1da177e4 LT	85
92b54a4f CL	86	static __be32 *
	87	encode_timeval(__be32 p, const struct timespec64 time)
	88	{
	89	*p++ = cpu_to_be32((u32)time->tv_sec);
	90	if (time->tv_nsec)
	91	*p++ = cpu_to_be32(time->tv_nsec / NSEC_PER_USEC);
	92	else
	93	*p++ = xdr_zero;
	94	return p;
	95	}
	96
6d742c18 CL	97	static bool
	98	svcxdr_decode_filename(struct xdr_stream xdr, char name, unsigned int len)
	99	{
	100	u32 size, i;
	101	__be32 *p;
	102	char *c;
	103
	104	if (xdr_stream_decode_u32(xdr, &size) < 0)
	105	return false;
	106	if (size == 0 \|\| size > NFS_MAXNAMLEN)
	107	return false;
	108	p = xdr_inline_decode(xdr, size);
	109	if (!p)
	110	return false;
	111
	112	*len = size;
	113	name = (char )p;
	114	for (i = 0, c = *name; i < size; i++, c++)
	115	if (c == '\0' \|\| c == '/')
	116	return false;
	117
	118	return true;
	119	}
	120
	121	static bool
	122	svcxdr_decode_diropargs(struct xdr_stream xdr, struct svc_fh fhp,
	123	char *name, unsigned int len)
	124	{
	125	return svcxdr_decode_fhandle(xdr, fhp) &&
	126	svcxdr_decode_filename(xdr, name, len);
	127	}
	128
2fdd6bd2 CL	129	static bool
	130	svcxdr_decode_sattr(struct svc_rqst rqstp, struct xdr_stream xdr,
	131	struct iattr *iap)
	132	{
	133	u32 tmp1, tmp2;
	134	__be32 *p;
	135
	136	p = xdr_inline_decode(xdr, XDR_UNIT * 8);
	137	if (!p)
	138	return false;
	139
	140	iap->ia_valid = 0;
	141
	142	/*
	143	* Some Sun clients put 0xffff in the mode field when they
	144	* mean 0xffffffff.
	145	*/
	146	tmp1 = be32_to_cpup(p++);
	147	if (tmp1 != (u32)-1 && tmp1 != 0xffff) {
	148	iap->ia_valid \|= ATTR_MODE;
	149	iap->ia_mode = tmp1;
	150	}
	151
	152	tmp1 = be32_to_cpup(p++);
	153	if (tmp1 != (u32)-1) {
	154	iap->ia_uid = make_kuid(nfsd_user_namespace(rqstp), tmp1);
	155	if (uid_valid(iap->ia_uid))
	156	iap->ia_valid \|= ATTR_UID;
	157	}
	158
	159	tmp1 = be32_to_cpup(p++);
	160	if (tmp1 != (u32)-1) {
	161	iap->ia_gid = make_kgid(nfsd_user_namespace(rqstp), tmp1);
	162	if (gid_valid(iap->ia_gid))
	163	iap->ia_valid \|= ATTR_GID;
	164	}
	165
	166	tmp1 = be32_to_cpup(p++);
	167	if (tmp1 != (u32)-1) {
	168	iap->ia_valid \|= ATTR_SIZE;
	169	iap->ia_size = tmp1;
	170	}
	171
	172	tmp1 = be32_to_cpup(p++);
	173	tmp2 = be32_to_cpup(p++);
	174	if (tmp1 != (u32)-1 && tmp2 != (u32)-1) {
	175	iap->ia_valid \|= ATTR_ATIME \| ATTR_ATIME_SET;
	176	iap->ia_atime.tv_sec = tmp1;
	177	iap->ia_atime.tv_nsec = tmp2 * NSEC_PER_USEC;
	178	}
	179
	180	tmp1 = be32_to_cpup(p++);
	181	tmp2 = be32_to_cpup(p++);
	182	if (tmp1 != (u32)-1 && tmp2 != (u32)-1) {
	183	iap->ia_valid \|= ATTR_MTIME \| ATTR_MTIME_SET;
	184	iap->ia_mtime.tv_sec = tmp1;
	185	iap->ia_mtime.tv_nsec = tmp2 * NSEC_PER_USEC;
	186	/*
	187	* Passing the invalid value useconds=1000000 for mtime
	188	* is a Sun convention for "set both mtime and atime to
	189	* current server time". It's needed to make permissions
	190	* checks for the "touch" program across v2 mounts to
	191	* Solaris and Irix boxes work correctly. See description of
	192	* sattr in section 6.1 of "NFS Illustrated" by
193	* Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5
194	*/
195	if (tmp2 == 1000000)
196	iap->ia_valid &= ~(ATTR_ATIME_SET\|ATTR_MTIME_SET);
197	}
198
199	return true;
200	}
201
f8cba473 CL	202	/**
	203	* svcxdr_encode_fattr - Encode NFSv2 file attributes
	204	* @rqstp: Context of a completed RPC transaction
	205	* @xdr: XDR stream
	206	* @fhp: File handle to encode
	207	* @stat: Attributes to encode
	208	*
	209	* Return values:
	210	* %false: Send buffer space was exhausted
	211	* %true: Success
	212	*/
	213	bool
92b54a4f CL	214	svcxdr_encode_fattr(struct svc_rqst rqstp, struct xdr_stream xdr,
	215	const struct svc_fh fhp, const struct kstat stat)
	216	{
	217	struct user_namespace *userns = nfsd_user_namespace(rqstp);
	218	struct dentry *dentry = fhp->fh_dentry;
	219	int type = stat->mode & S_IFMT;
	220	struct timespec64 time;
	221	__be32 *p;
	222	u32 fsid;
	223
	224	p = xdr_reserve_space(xdr, XDR_UNIT * 17);
	225	if (!p)
e3b4ef22	226	return false;
92b54a4f CL	227
	228	*p++ = cpu_to_be32(nfs_ftypes[type >> 12]);
	229	*p++ = cpu_to_be32((u32)stat->mode);
	230	*p++ = cpu_to_be32((u32)stat->nlink);
	231	*p++ = cpu_to_be32((u32)from_kuid_munged(userns, stat->uid));
	232	*p++ = cpu_to_be32((u32)from_kgid_munged(userns, stat->gid));
	233
	234	if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN)
	235	*p++ = cpu_to_be32(NFS_MAXPATHLEN);
	236	else
	237	*p++ = cpu_to_be32((u32) stat->size);
	238	*p++ = cpu_to_be32((u32) stat->blksize);
	239	if (S_ISCHR(type) \|\| S_ISBLK(type))
	240	*p++ = cpu_to_be32(new_encode_dev(stat->rdev));
	241	else
	242	*p++ = cpu_to_be32(0xffffffff);
	243	*p++ = cpu_to_be32((u32)stat->blocks);
	244
	245	switch (fsid_source(fhp)) {
	246	case FSIDSOURCE_FSID:
	247	fsid = (u32)fhp->fh_export->ex_fsid;
	248	break;
	249	case FSIDSOURCE_UUID:
	250	fsid = ((u32 *)fhp->fh_export->ex_uuid)[0];
	251	fsid ^= ((u32 *)fhp->fh_export->ex_uuid)[1];
	252	fsid ^= ((u32 *)fhp->fh_export->ex_uuid)[2];
	253	fsid ^= ((u32 *)fhp->fh_export->ex_uuid)[3];
	254	break;
	255	default:
	256	fsid = new_encode_dev(stat->dev);
	257	break;
	258	}
	259	*p++ = cpu_to_be32(fsid);
	260
	261	*p++ = cpu_to_be32((u32)stat->ino);
	262	p = encode_timeval(p, &stat->atime);
	263	time = stat->mtime;
	264	lease_get_mtime(d_inode(dentry), &time);
	265	p = encode_timeval(p, &time);
	266	encode_timeval(p, &stat->ctime);
	267
e3b4ef22	268	return true;
92b54a4f CL	269	}
92b54a4f CL	270
1da177e4 LT	271	/*
	272	* XDR decode functions
	273	*/
1da177e4 LT	274
1da177e4 LT	275	int
ebcd8e8b	276	nfssvc_decode_fhandleargs(struct svc_rqst rqstp, __be32 p)
1da177e4	277	{
ebcd8e8b	278	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
026fec7e CH	279	struct nfsd_fhandle *args = rqstp->rq_argp;
026fec7e CH	280
ebcd8e8b	281	return svcxdr_decode_fhandle(xdr, &args->fh);
1da177e4 LT	282	}
	283
	284	int
026fec7e	285	nfssvc_decode_sattrargs(struct svc_rqst rqstp, __be32 p)
1da177e4	286	{
2fdd6bd2	287	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
026fec7e CH	288	struct nfsd_sattrargs *args = rqstp->rq_argp;
026fec7e CH	289
2fdd6bd2 CL	290	return svcxdr_decode_fhandle(xdr, &args->fh) &&
2fdd6bd2 CL	291	svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
1da177e4 LT	292	}
	293
	294	int
026fec7e	295	nfssvc_decode_diropargs(struct svc_rqst rqstp, __be32 p)
1da177e4	296	{
6d742c18	297	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
026fec7e CH	298	struct nfsd_diropargs *args = rqstp->rq_argp;
026fec7e CH	299
6d742c18	300	return svcxdr_decode_diropargs(xdr, &args->fh, &args->name, &args->len);
1da177e4 LT	301	}
	302
	303	int
026fec7e	304	nfssvc_decode_readargs(struct svc_rqst rqstp, __be32 p)
1da177e4	305	{
8c293ef9	306	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
026fec7e	307	struct nfsd_readargs *args = rqstp->rq_argp;
8c293ef9	308	u32 totalcount;
1da177e4	309
8c293ef9 CL	310	if (!svcxdr_decode_fhandle(xdr, &args->fh))
	311	return 0;
	312	if (xdr_stream_decode_u32(xdr, &args->offset) < 0)
	313	return 0;
	314	if (xdr_stream_decode_u32(xdr, &args->count) < 0)
	315	return 0;
	316	/* totalcount is ignored */
	317	if (xdr_stream_decode_u32(xdr, &totalcount) < 0)
	318	return 0;
1da177e4	319
8c293ef9	320	return 1;
1da177e4 LT	321	}
	322
	323	int
026fec7e	324	nfssvc_decode_writeargs(struct svc_rqst rqstp, __be32 p)
1da177e4	325	{
a51b5b73	326	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
026fec7e	327	struct nfsd_writeargs *args = rqstp->rq_argp;
db44bac4	328	struct kvec *head = rqstp->rq_arg.head;
a51b5b73 CL	329	struct kvec *tail = rqstp->rq_arg.tail;
	330	u32 beginoffset, totalcount;
	331	size_t remaining;
f34b9568	332
a51b5b73	333	if (!svcxdr_decode_fhandle(xdr, &args->fh))
1da177e4	334	return 0;
a51b5b73 CL	335	/* beginoffset is ignored */
	336	if (xdr_stream_decode_u32(xdr, &beginoffset) < 0)
	337	return 0;
	338	if (xdr_stream_decode_u32(xdr, &args->offset) < 0)
	339	return 0;
	340	/* totalcount is ignored */
	341	if (xdr_stream_decode_u32(xdr, &totalcount) < 0)
f34b9568 PS	342	return 0;
f34b9568 PS	343
a51b5b73 CL	344	/* opaque data */
a51b5b73 CL	345	if (xdr_stream_decode_u32(xdr, &args->len) < 0)
13bf9fbf	346	return 0;
a51b5b73 CL	347	if (args->len > NFSSVC_MAXBLKSIZE_V2)
	348	return 0;
	349	remaining = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len;
	350	remaining -= xdr_stream_pos(xdr);
	351	if (remaining < xdr_align_size(args->len))
f34b9568	352	return 0;
a51b5b73 CL	353	args->first.iov_base = xdr->p;
a51b5b73 CL	354	args->first.iov_len = head->iov_len - xdr_stream_pos(xdr);
f34b9568	355
f34b9568	356	return 1;
1da177e4 LT	357	}
	358
	359	int
026fec7e	360	nfssvc_decode_createargs(struct svc_rqst rqstp, __be32 p)
1da177e4	361	{
7dcf65b9	362	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
026fec7e CH	363	struct nfsd_createargs *args = rqstp->rq_argp;
026fec7e CH	364
7dcf65b9 CL	365	return svcxdr_decode_diropargs(xdr, &args->fh,
	366	&args->name, &args->len) &&
	367	svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
1da177e4 LT	368	}
	369
	370	int
026fec7e	371	nfssvc_decode_renameargs(struct svc_rqst rqstp, __be32 p)
1da177e4	372	{
62aa557e	373	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
026fec7e CH	374	struct nfsd_renameargs *args = rqstp->rq_argp;
026fec7e CH	375
62aa557e CL	376	return svcxdr_decode_diropargs(xdr, &args->ffh,
	377	&args->fname, &args->flen) &&
	378	svcxdr_decode_diropargs(xdr, &args->tfh,
	379	&args->tname, &args->tlen);
1da177e4 LT	380	}
	381
	382	int
026fec7e	383	nfssvc_decode_linkargs(struct svc_rqst rqstp, __be32 p)
1da177e4	384	{
77edcdf9	385	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
026fec7e CH	386	struct nfsd_linkargs *args = rqstp->rq_argp;
026fec7e CH	387
77edcdf9 CL	388	return svcxdr_decode_fhandle(xdr, &args->ffh) &&
	389	svcxdr_decode_diropargs(xdr, &args->tfh,
	390	&args->tname, &args->tlen);
1da177e4 LT	391	}
	392
	393	int
026fec7e	394	nfssvc_decode_symlinkargs(struct svc_rqst rqstp, __be32 p)
1da177e4	395	{
09f75a53	396	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
026fec7e	397	struct nfsd_symlinkargs *args = rqstp->rq_argp;
09f75a53	398	struct kvec *head = rqstp->rq_arg.head;
026fec7e	399
09f75a53 CL	400	if (!svcxdr_decode_diropargs(xdr, &args->ffh, &args->fname, &args->flen))
	401	return 0;
	402	if (xdr_stream_decode_u32(xdr, &args->tlen) < 0)
1da177e4	403	return 0;
38a70315 CL	404	if (args->tlen == 0)
	405	return 0;
	406
09f75a53 CL	407	args->first.iov_len = head->iov_len - xdr_stream_pos(xdr);
	408	args->first.iov_base = xdr_inline_decode(xdr, args->tlen);
	409	if (!args->first.iov_base)
	410	return 0;
	411	return svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
1da177e4 LT	412	}
	413
	414	int
026fec7e	415	nfssvc_decode_readdirargs(struct svc_rqst rqstp, __be32 p)
1da177e4	416	{
8688361a	417	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
026fec7e CH	418	struct nfsd_readdirargs *args = rqstp->rq_argp;
026fec7e CH	419
8688361a CL	420	if (!svcxdr_decode_fhandle(xdr, &args->fh))
	421	return 0;
	422	if (xdr_stream_decode_u32(xdr, &args->cookie) < 0)
	423	return 0;
	424	if (xdr_stream_decode_u32(xdr, &args->count) < 0)
1da177e4	425	return 0;
1da177e4	426
8688361a	427	return 1;
1da177e4 LT	428	}
	429
	430	/*
	431	* XDR encode functions
	432	*/
1da177e4	433
cc028a10	434	int
a887eaed	435	nfssvc_encode_statres(struct svc_rqst rqstp, __be32 p)
cc028a10	436	{
a887eaed	437	struct xdr_stream *xdr = &rqstp->rq_res_stream;
cc028a10 CL	438	struct nfsd_stat *resp = rqstp->rq_resp;
cc028a10 CL	439
a887eaed	440	return svcxdr_encode_stat(xdr, resp->status);
cc028a10 CL	441	}
cc028a10 CL	442
1da177e4	443	int
92b54a4f	444	nfssvc_encode_attrstatres(struct svc_rqst rqstp, __be32 p)
1da177e4	445	{
92b54a4f	446	struct xdr_stream *xdr = &rqstp->rq_res_stream;
63f8de37 CH	447	struct nfsd_attrstat *resp = rqstp->rq_resp;
63f8de37 CH	448
92b54a4f CL	449	if (!svcxdr_encode_stat(xdr, resp->status))
	450	return 0;
	451	switch (resp->status) {
	452	case nfs_ok:
	453	if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
	454	return 0;
	455	break;
	456	}
	457
	458	return 1;
1da177e4 LT	459	}
	460
	461	int
63f8de37	462	nfssvc_encode_diropres(struct svc_rqst rqstp, __be32 p)
1da177e4	463	{
e3b4ef22	464	struct xdr_stream *xdr = &rqstp->rq_res_stream;
63f8de37 CH	465	struct nfsd_diropres *resp = rqstp->rq_resp;
63f8de37 CH	466
e3b4ef22 CL	467	if (!svcxdr_encode_stat(xdr, resp->status))
	468	return 0;
	469	switch (resp->status) {
	470	case nfs_ok:
	471	if (!svcxdr_encode_fhandle(xdr, &resp->fh))
	472	return 0;
	473	if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
	474	return 0;
	475	break;
	476	}
	477
	478	return 1;
1da177e4 LT	479	}
	480
	481	int
63f8de37	482	nfssvc_encode_readlinkres(struct svc_rqst rqstp, __be32 p)
1da177e4	483	{
d9014b0f	484	struct xdr_stream *xdr = &rqstp->rq_res_stream;
63f8de37	485	struct nfsd_readlinkres *resp = rqstp->rq_resp;
76e5492b	486	struct kvec *head = rqstp->rq_res.head;
63f8de37	487
d9014b0f	488	if (!svcxdr_encode_stat(xdr, resp->status))
76e5492b	489	return 0;
d9014b0f CL	490	switch (resp->status) {
	491	case nfs_ok:
	492	if (xdr_stream_encode_u32(xdr, resp->len) < 0)
	493	return 0;
	494	xdr_write_pages(xdr, &resp->page, 0, resp->len);
	495	if (svc_encode_result_payload(rqstp, head->iov_len, resp->len) < 0)
	496	return 0;
	497	break;
	498	}
	499
1da177e4 LT	500	return 1;
	501	}
	502
	503	int
63f8de37	504	nfssvc_encode_readres(struct svc_rqst rqstp, __be32 p)
1da177e4	505	{
a6f8d9dc	506	struct xdr_stream *xdr = &rqstp->rq_res_stream;
63f8de37	507	struct nfsd_readres *resp = rqstp->rq_resp;
76e5492b	508	struct kvec *head = rqstp->rq_res.head;
63f8de37	509
a6f8d9dc	510	if (!svcxdr_encode_stat(xdr, resp->status))
76e5492b	511	return 0;
a6f8d9dc CL	512	switch (resp->status) {
	513	case nfs_ok:
	514	if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
	515	return 0;
	516	if (xdr_stream_encode_u32(xdr, resp->count) < 0)
	517	return 0;
	518	xdr_write_pages(xdr, resp->pages, rqstp->rq_res.page_base,
	519	resp->count);
	520	if (svc_encode_result_payload(rqstp, head->iov_len, resp->count) < 0)
	521	return 0;
	522	break;
	523	}
	524
1da177e4 LT	525	return 1;
	526	}
	527
	528	int
63f8de37	529	nfssvc_encode_readdirres(struct svc_rqst rqstp, __be32 p)
1da177e4	530	{
94c8f8c6	531	struct xdr_stream *xdr = &rqstp->rq_res_stream;
63f8de37	532	struct nfsd_readdirres *resp = rqstp->rq_resp;
f5dcccd6	533	struct xdr_buf *dirlist = &resp->dirlist;
63f8de37	534
94c8f8c6 CL	535	if (!svcxdr_encode_stat(xdr, resp->status))
	536	return 0;
	537	switch (resp->status) {
	538	case nfs_ok:
f5dcccd6	539	xdr_write_pages(xdr, dirlist->pages, 0, dirlist->len);
94c8f8c6 CL	540	/* no more entries */
	541	if (xdr_stream_encode_item_absent(xdr) < 0)
	542	return 0;
	543	if (xdr_stream_encode_bool(xdr, resp->common.err == nfserr_eof) < 0)
	544	return 0;
	545	break;
	546	}
1da177e4 LT	547
	548	return 1;
	549	}
	550
	551	int
63f8de37	552	nfssvc_encode_statfsres(struct svc_rqst rqstp, __be32 p)
1da177e4	553	{
bf15229f	554	struct xdr_stream *xdr = &rqstp->rq_res_stream;
63f8de37	555	struct nfsd_statfsres *resp = rqstp->rq_resp;
1da177e4 LT	556	struct kstatfs *stat = &resp->stats;
1da177e4 LT	557
bf15229f CL	558	if (!svcxdr_encode_stat(xdr, resp->status))
	559	return 0;
	560	switch (resp->status) {
	561	case nfs_ok:
	562	p = xdr_reserve_space(xdr, XDR_UNIT * 5);
	563	if (!p)
	564	return 0;
	565	*p++ = cpu_to_be32(NFSSVC_MAXBLKSIZE_V2);
	566	*p++ = cpu_to_be32(stat->f_bsize);
	567	*p++ = cpu_to_be32(stat->f_blocks);
	568	*p++ = cpu_to_be32(stat->f_bfree);
	569	*p = cpu_to_be32(stat->f_bavail);
	570	break;
	571	}
f0af2210	572
bf15229f	573	return 1;
1da177e4 LT	574	}
1da177e4 LT	575
d5253200 CL	576	/**
	577	* nfssvc_encode_nfscookie - Encode a directory offset cookie
	578	* @resp: readdir result context
	579	* @offset: offset cookie to encode
	580	*
f5dcccd6 CL	581	* The buffer space for the offset cookie has already been reserved
f5dcccd6 CL	582	* by svcxdr_encode_entry_common().
d5253200 CL	583	*/
	584	void nfssvc_encode_nfscookie(struct nfsd_readdirres *resp, u32 offset)
	585	{
f5dcccd6 CL	586	__be32 cookie = cpu_to_be32(offset);
	587
	588	if (!resp->cookie_offset)
d5253200 CL	589	return;
d5253200 CL	590
f5dcccd6 CL	591	write_bytes_to_xdr_buf(&resp->dirlist, resp->cookie_offset, &cookie,
	592	sizeof(cookie));
	593	resp->cookie_offset = 0;
	594	}
	595
	596	static bool
	597	svcxdr_encode_entry_common(struct nfsd_readdirres resp, const char name,
	598	int namlen, loff_t offset, u64 ino)
	599	{
	600	struct xdr_buf *dirlist = &resp->dirlist;
	601	struct xdr_stream *xdr = &resp->xdr;
	602
	603	if (xdr_stream_encode_item_present(xdr) < 0)
	604	return false;
	605	/* fileid */
	606	if (xdr_stream_encode_u32(xdr, (u32)ino) < 0)
	607	return false;
	608	/* name */
	609	if (xdr_stream_encode_opaque(xdr, name, min(namlen, NFS2_MAXNAMLEN)) < 0)
	610	return false;
	611	/* cookie */
	612	resp->cookie_offset = dirlist->len;
	613	if (xdr_stream_encode_u32(xdr, ~0U) < 0)
	614	return false;
	615
	616	return true;
	617	}
	618
	619	/**
8a2cf9f5	620	* nfssvc_encode_entry - encode one NFSv2 READDIR entry
f5dcccd6 CL	621	* @data: directory context
	622	* @name: name of the object to be encoded
	623	* @namlen: length of that name, in bytes
	624	* @offset: the offset of the previous entry
	625	* @ino: the fileid of this entry
	626	* @d_type: unused
	627	*
	628	* Return values:
	629	* %0: Entry was successfully encoded.
	630	* %-EINVAL: An encoding problem occured, secondary status code in resp->common.err
	631	*
	632	* On exit, the following fields are updated:
	633	* - resp->xdr
	634	* - resp->common.err
	635	* - resp->cookie_offset
	636	*/
8a2cf9f5 CL	637	int nfssvc_encode_entry(void data, const char name, int namlen,
8a2cf9f5 CL	638	loff_t offset, u64 ino, unsigned int d_type)
f5dcccd6 CL	639	{
	640	struct readdir_cd *ccd = data;
	641	struct nfsd_readdirres *resp = container_of(ccd,
	642	struct nfsd_readdirres,
	643	common);
	644	unsigned int starting_length = resp->dirlist.len;
	645
	646	/* The offset cookie for the previous entry */
	647	nfssvc_encode_nfscookie(resp, offset);
	648
	649	if (!svcxdr_encode_entry_common(resp, name, namlen, offset, ino))
	650	goto out_toosmall;
	651
	652	xdr_commit_encode(&resp->xdr);
	653	resp->common.err = nfs_ok;
	654	return 0;
	655
	656	out_toosmall:
	657	resp->cookie_offset = 0;
	658	resp->common.err = nfserr_toosmall;
	659	resp->dirlist.len = starting_length;
	660	return -EINVAL;
d5253200 CL	661	}
d5253200 CL	662
1da177e4 LT	663	/*
	664	* XDR release functions
	665	*/
1841b9b6	666	void nfssvc_release_attrstat(struct svc_rqst *rqstp)
1da177e4	667	{
1841b9b6 CL	668	struct nfsd_attrstat *resp = rqstp->rq_resp;
	669
	670	fh_put(&resp->fh);
	671	}
	672
	673	void nfssvc_release_diropres(struct svc_rqst *rqstp)
	674	{
	675	struct nfsd_diropres *resp = rqstp->rq_resp;
	676
	677	fh_put(&resp->fh);
	678	}
	679
	680	void nfssvc_release_readres(struct svc_rqst *rqstp)
	681	{
	682	struct nfsd_readres *resp = rqstp->rq_resp;
8537488b	683
1da177e4	684	fh_put(&resp->fh);
1da177e4	685	}