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

/*
 * XDR support for nfsd
 *
 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
 */

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

#define NFSDDBG_FACILITY		NFSDDBG_XDR

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


/*
 * XDR functions for basic NFS types
 */
static __be32 *
decode_fh(__be32 *p, struct svc_fh *fhp)
{
	fh_init(fhp, NFS_FHSIZE);
	memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE);
	fhp->fh_handle.fh_size = NFS_FHSIZE;

	/* FIXME: Look up export pointer here and verify
	 * Sun Secure RPC if requested */
	return p + (NFS_FHSIZE >> 2);
}

/* Helper function for NFSv2 ACL code */
__be32 *nfs2svc_decode_fh(__be32 *p, struct svc_fh *fhp)
{
	return decode_fh(p, fhp);
}

static __be32 *
encode_fh(__be32 *p, struct svc_fh *fhp)
{
	memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE);
	return p + (NFS_FHSIZE>> 2);
}

/*
 * 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, NFS_MAXNAMLEN)) != NULL) {
		for (i = 0, name = *namp; i < *lenp; i++, name++) {
			if (*name == '\0' || *name == '/')
				return NULL;
		}
	}

	return p;
}

static __be32 *
decode_pathname(__be32 *p, char **namp, unsigned int *lenp)
{
	char		*name;
	unsigned int	i;

	if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXPATHLEN)) != NULL) {
		for (i = 0, name = *namp; i < *lenp; i++, name++) {
			if (*name == '\0')
				return NULL;
		}
	}

	return p;
}

static __be32 *
decode_sattr(__be32 *p, struct iattr *iap)
{
	u32	tmp, tmp1;

	iap->ia_valid = 0;

	/* Sun client bug compatibility check: some sun clients seem to
	 * put 0xffff in the mode field when they mean 0xffffffff.
	 * Quoting the 4.4BSD nfs server code: Nah nah nah nah na nah.
	 */
	if ((tmp = ntohl(*p++)) != (u32)-1 && tmp != 0xffff) {
		iap->ia_valid |= ATTR_MODE;
		iap->ia_mode = tmp;
	}
	if ((tmp = ntohl(*p++)) != (u32)-1) {
		iap->ia_uid = make_kuid(&init_user_ns, tmp);
		if (uid_valid(iap->ia_uid))
			iap->ia_valid |= ATTR_UID;
	}
	if ((tmp = ntohl(*p++)) != (u32)-1) {
		iap->ia_gid = make_kgid(&init_user_ns, tmp);
		if (gid_valid(iap->ia_gid))
			iap->ia_valid |= ATTR_GID;
	}
	if ((tmp = ntohl(*p++)) != (u32)-1) {
		iap->ia_valid |= ATTR_SIZE;
		iap->ia_size = tmp;
	}
	tmp  = ntohl(*p++); tmp1 = ntohl(*p++);
	if (tmp != (u32)-1 && tmp1 != (u32)-1) {
		iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
		iap->ia_atime.tv_sec = tmp;
		iap->ia_atime.tv_nsec = tmp1 * 1000; 
	}
	tmp  = ntohl(*p++); tmp1 = ntohl(*p++);
	if (tmp != (u32)-1 && tmp1 != (u32)-1) {
		iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
		iap->ia_mtime.tv_sec = tmp;
		iap->ia_mtime.tv_nsec = tmp1 * 1000; 
		/*
		 * 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 (tmp1 == 1000000)
			iap->ia_valid &= ~(ATTR_ATIME_SET|ATTR_MTIME_SET);
	}
	return p;
}

static __be32 *
encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
	     struct kstat *stat)
{
	struct dentry	*dentry = fhp->fh_dentry;
	int type;
	struct timespec time;
	u32 f;

	type = (stat->mode & S_IFMT);

	*p++ = htonl(nfs_ftypes[type >> 12]);
	*p++ = htonl((u32) stat->mode);
	*p++ = htonl((u32) stat->nlink);
	*p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
	*p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid));

	if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN) {
		*p++ = htonl(NFS_MAXPATHLEN);
	} else {
		*p++ = htonl((u32) stat->size);
	}
	*p++ = htonl((u32) stat->blksize);
	if (S_ISCHR(type) || S_ISBLK(type))
		*p++ = htonl(new_encode_dev(stat->rdev));
	else
		*p++ = htonl(0xffffffff);
	*p++ = htonl((u32) stat->blocks);
	switch (fsid_source(fhp)) {
	default:
	case FSIDSOURCE_DEV:
		*p++ = htonl(new_encode_dev(stat->dev));
		break;
	case FSIDSOURCE_FSID:
		*p++ = htonl((u32) fhp->fh_export->ex_fsid);
		break;
	case FSIDSOURCE_UUID:
		f = ((u32*)fhp->fh_export->ex_uuid)[0];
		f ^= ((u32*)fhp->fh_export->ex_uuid)[1];
		f ^= ((u32*)fhp->fh_export->ex_uuid)[2];
		f ^= ((u32*)fhp->fh_export->ex_uuid)[3];
		*p++ = htonl(f);
		break;
	}
	*p++ = htonl((u32) stat->ino);
	*p++ = htonl((u32) stat->atime.tv_sec);
	*p++ = htonl(stat->atime.tv_nsec ? stat->atime.tv_nsec / 1000 : 0);
	lease_get_mtime(d_inode(dentry), &time); 
	*p++ = htonl((u32) time.tv_sec);
	*p++ = htonl(time.tv_nsec ? time.tv_nsec / 1000 : 0); 
	*p++ = htonl((u32) stat->ctime.tv_sec);
	*p++ = htonl(stat->ctime.tv_nsec ? stat->ctime.tv_nsec / 1000 : 0);

	return p;
}

/* Helper function for NFSv2 ACL code */
__be32 *nfs2svc_encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp, struct kstat *stat)
{
	return encode_fattr(rqstp, p, fhp, stat);
}

/*
 * XDR decode functions
 */
int
nfssvc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
{
	return xdr_argsize_check(rqstp, p);
}

int
nfssvc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args)
{
	p = decode_fh(p, &args->fh);
	if (!p)
		return 0;
	return xdr_argsize_check(rqstp, p);
}

int
nfssvc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p,
					struct nfsd_sattrargs *args)
{
	p = decode_fh(p, &args->fh);
	if (!p)
		return 0;
	p = decode_sattr(p, &args->attrs);

	return xdr_argsize_check(rqstp, p);
}

int
nfssvc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p,
					struct nfsd_diropargs *args)
{
	if (!(p = decode_fh(p, &args->fh))
	 || !(p = decode_filename(p, &args->name, &args->len)))
		return 0;

	return xdr_argsize_check(rqstp, p);
}

int
nfssvc_decode_readargs(struct svc_rqst *rqstp, __be32 *p,
					struct nfsd_readargs *args)
{
	unsigned int len;
	int v;
	p = decode_fh(p, &args->fh);
	if (!p)
		return 0;

	args->offset    = ntohl(*p++);
	len = args->count     = ntohl(*p++);
	p++; /* totalcount - unused */

	if (!xdr_argsize_check(rqstp, p))
		return 0;

	len = min_t(unsigned int, len, NFSSVC_MAXBLKSIZE_V2);

	/* set up somewhere to store response.
	 * We take pages, put them on reslist and include in iovec
	 */
	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 1;
}

int
nfssvc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p,
					struct nfsd_writeargs *args)
{
	unsigned int len, hdr, dlen;
	struct kvec *head = rqstp->rq_arg.head;
	int v;

	p = decode_fh(p, &args->fh);
	if (!p)
		return 0;

	p++;				/* beginoffset */
	args->offset = ntohl(*p++);	/* offset */
	p++;				/* totalcount */
	len = args->len = ntohl(*p++);
	/*
	 * The protocol specifies a maximum of 8192 bytes.
	 */
	if (len > NFSSVC_MAXBLKSIZE_V2)
		return 0;

	/*
	 * Check to make sure that we got the right number of
	 * bytes.
	 */
	hdr = (void*)p - head->iov_base;
	if (hdr > head->iov_len)
		return 0;
	dlen = head->iov_len + rqstp->rq_arg.page_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;

	rqstp->rq_vec[0].iov_base = (void*)p;
	rqstp->rq_vec[0].iov_len = head->iov_len - hdr;
	v = 0;
	while (len > rqstp->rq_vec[v].iov_len) {
		len -= rqstp->rq_vec[v].iov_len;
		v++;
		rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
		rqstp->rq_vec[v].iov_len = PAGE_SIZE;
	}
	rqstp->rq_vec[v].iov_len = len;
	args->vlen = v + 1;
	return 1;
}

int
nfssvc_decode_createargs(struct svc_rqst *rqstp, __be32 *p,
					struct nfsd_createargs *args)
{
	if (   !(p = decode_fh(p, &args->fh))
	    || !(p = decode_filename(p, &args->name, &args->len)))
		return 0;
	p = decode_sattr(p, &args->attrs);

	return xdr_argsize_check(rqstp, p);
}

int
nfssvc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p,
					struct nfsd_renameargs *args)
{
	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
nfssvc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd_readlinkargs *args)
{
	p = decode_fh(p, &args->fh);
	if (!p)
		return 0;
	if (!xdr_argsize_check(rqstp, p))
		return 0;
	args->buffer = page_address(*(rqstp->rq_next_page++));

	return 1;
}

int
nfssvc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p,
					struct nfsd_linkargs *args)
{
	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
nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p,
					struct nfsd_symlinkargs *args)
{
	if (   !(p = decode_fh(p, &args->ffh))
	    || !(p = decode_filename(p, &args->fname, &args->flen))
	    || !(p = decode_pathname(p, &args->tname, &args->tlen)))
		return 0;
	p = decode_sattr(p, &args->attrs);

	return xdr_argsize_check(rqstp, p);
}

int
nfssvc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
					struct nfsd_readdirargs *args)
{
	p = decode_fh(p, &args->fh);
	if (!p)
		return 0;
	args->cookie = ntohl(*p++);
	args->count  = ntohl(*p++);
	args->count  = min_t(u32, args->count, PAGE_SIZE);
	if (!xdr_argsize_check(rqstp, p))
		return 0;
	args->buffer = page_address(*(rqstp->rq_next_page++));

	return 1;
}

/*
 * XDR encode functions
 */
int
nfssvc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
{
	return xdr_ressize_check(rqstp, p);
}

int
nfssvc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
					struct nfsd_attrstat *resp)
{
	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
	return xdr_ressize_check(rqstp, p);
}

int
nfssvc_encode_diropres(struct svc_rqst *rqstp, __be32 *p,
					struct nfsd_diropres *resp)
{
	p = encode_fh(p, &resp->fh);
	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
	return xdr_ressize_check(rqstp, p);
}

int
nfssvc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p,
					struct nfsd_readlinkres *resp)
{
	*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;
}

int
nfssvc_encode_readres(struct svc_rqst *rqstp, __be32 *p,
					struct nfsd_readres *resp)
{
	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
	*p++ = htonl(resp->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;
}

int
nfssvc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
					struct nfsd_readdirres *resp)
{
	xdr_ressize_check(rqstp, p);
	p = resp->buffer;
	*p++ = 0;			/* no more entries */
	*p++ = htonl((resp->common.err == nfserr_eof));
	rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1;

	return 1;
}

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

	*p++ = htonl(NFSSVC_MAXBLKSIZE_V2);	/* max transfer size */
	*p++ = htonl(stat->f_bsize);
	*p++ = htonl(stat->f_blocks);
	*p++ = htonl(stat->f_bfree);
	*p++ = htonl(stat->f_bavail);
	return xdr_ressize_check(rqstp, p);
}

int
nfssvc_encode_entry(void *ccdv, const char *name,
		    int namlen, loff_t offset, u64 ino, unsigned int d_type)
{
	struct readdir_cd *ccd = ccdv;
	struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common);
	__be32	*p = cd->buffer;
	int	buflen, slen;

	/*
	dprintk("nfsd: entry(%.*s off %ld ino %ld)\n",
			namlen, name, offset, ino);
	 */

	if (offset > ~((u32) 0)) {
		cd->common.err = nfserr_fbig;
		return -EINVAL;
	}
	if (cd->offset)
		*cd->offset = htonl(offset);

	/* truncate filename */
	namlen = min(namlen, NFS2_MAXNAMLEN);
	slen = XDR_QUADLEN(namlen);

	if ((buflen = cd->buflen - slen - 4) < 0) {
		cd->common.err = nfserr_toosmall;
		return -EINVAL;
	}
	if (ino > ~((u32) 0)) {
		cd->common.err = nfserr_fbig;
		return -EINVAL;
	}
	*p++ = xdr_one;				/* mark entry present */
	*p++ = htonl((u32) ino);		/* file id */
	p    = xdr_encode_array(p, name, namlen);/* name length & name */
	cd->offset = p;			/* remember pointer */
	*p++ = htonl(~0U);		/* offset of next entry */

	cd->buflen = buflen;
	cd->buffer = p;
	cd->common.err = nfs_ok;
	return 0;
}

/*
 * XDR release functions
 */
int
nfssvc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
					struct nfsd_fhandle *resp)
{
	fh_put(&resp->fh);
	return 1;
}
Commit	Line	Data
1da177e4	1	/*
1da177e4 LT	2	* XDR support for nfsd
	3	*
	4	* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
	5	*/
	6
3dadecce	7	#include "vfs.h"
9a74af21	8	#include "xdr.h"
2e8138a2	9	#include "auth.h"
1da177e4 LT	10
	11	#define NFSDDBG_FACILITY NFSDDBG_XDR
	12
1da177e4 LT	13	/*
	14	* Mapping of S_IF* types to NFS file types
	15	*/
	16	static u32 nfs_ftypes[] = {
	17	NFNON, NFCHR, NFCHR, NFBAD,
	18	NFDIR, NFBAD, NFBLK, NFBAD,
	19	NFREG, NFBAD, NFLNK, NFBAD,
	20	NFSOCK, NFBAD, NFLNK, NFBAD,
	21	};
	22
	23
	24	/*
	25	* XDR functions for basic NFS types
	26	*/
131a21c2 AV	27	static __be32 *
131a21c2 AV	28	decode_fh(__be32 p, struct svc_fh fhp)
1da177e4 LT	29	{
	30	fh_init(fhp, NFS_FHSIZE);
	31	memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE);
	32	fhp->fh_handle.fh_size = NFS_FHSIZE;
	33
	34	/* FIXME: Look up export pointer here and verify
	35	* Sun Secure RPC if requested */
	36	return p + (NFS_FHSIZE >> 2);
	37	}
	38
a257cdd0	39	/* Helper function for NFSv2 ACL code */
131a21c2	40	__be32 nfs2svc_decode_fh(__be32 p, struct svc_fh *fhp)
a257cdd0 AG	41	{
	42	return decode_fh(p, fhp);
	43	}
	44
3ee6f61c	45	static __be32 *
131a21c2	46	encode_fh(__be32 p, struct svc_fh fhp)
1da177e4 LT	47	{
	48	memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE);
	49	return p + (NFS_FHSIZE>> 2);
	50	}
	51
	52	/*
	53	* Decode a file name and make sure that the path contains
	54	* no slashes or null bytes.
	55	*/
3ee6f61c	56	static __be32 *
ee1a95b3	57	decode_filename(__be32 p, char namp, unsigned int lenp)
1da177e4 LT	58	{
1da177e4 LT	59	char *name;
ee1a95b3	60	unsigned int i;
1da177e4 LT	61
	62	if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXNAMLEN)) != NULL) {
	63	for (i = 0, name = namp; i < lenp; i++, name++) {
	64	if (name == '\0' \|\| name == '/')
	65	return NULL;
	66	}
	67	}
	68
	69	return p;
	70	}
	71
3ee6f61c	72	static __be32 *
9c7544d3	73	decode_pathname(__be32 p, char namp, unsigned int lenp)
1da177e4 LT	74	{
1da177e4 LT	75	char *name;
9c7544d3	76	unsigned int i;
1da177e4 LT	77
	78	if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXPATHLEN)) != NULL) {
	79	for (i = 0, name = namp; i < lenp; i++, name++) {
	80	if (*name == '\0')
	81	return NULL;
	82	}
	83	}
	84
	85	return p;
	86	}
	87
3ee6f61c	88	static __be32 *
131a21c2	89	decode_sattr(__be32 p, struct iattr iap)
1da177e4 LT	90	{
	91	u32 tmp, tmp1;
	92
	93	iap->ia_valid = 0;
	94
	95	/* Sun client bug compatibility check: some sun clients seem to
	96	* put 0xffff in the mode field when they mean 0xffffffff.
	97	* Quoting the 4.4BSD nfs server code: Nah nah nah nah na nah.
	98	*/
	99	if ((tmp = ntohl(*p++)) != (u32)-1 && tmp != 0xffff) {
	100	iap->ia_valid \|= ATTR_MODE;
	101	iap->ia_mode = tmp;
	102	}
	103	if ((tmp = ntohl(*p++)) != (u32)-1) {
7c19723e EB	104	iap->ia_uid = make_kuid(&init_user_ns, tmp);
	105	if (uid_valid(iap->ia_uid))
	106	iap->ia_valid \|= ATTR_UID;
1da177e4 LT	107	}
1da177e4 LT	108	if ((tmp = ntohl(*p++)) != (u32)-1) {
7c19723e EB	109	iap->ia_gid = make_kgid(&init_user_ns, tmp);
	110	if (gid_valid(iap->ia_gid))
	111	iap->ia_valid \|= ATTR_GID;
1da177e4 LT	112	}
	113	if ((tmp = ntohl(*p++)) != (u32)-1) {
	114	iap->ia_valid \|= ATTR_SIZE;
	115	iap->ia_size = tmp;
	116	}
	117	tmp = ntohl(p++); tmp1 = ntohl(p++);
	118	if (tmp != (u32)-1 && tmp1 != (u32)-1) {
	119	iap->ia_valid \|= ATTR_ATIME \| ATTR_ATIME_SET;
	120	iap->ia_atime.tv_sec = tmp;
	121	iap->ia_atime.tv_nsec = tmp1 * 1000;
	122	}
	123	tmp = ntohl(p++); tmp1 = ntohl(p++);
	124	if (tmp != (u32)-1 && tmp1 != (u32)-1) {
	125	iap->ia_valid \|= ATTR_MTIME \| ATTR_MTIME_SET;
	126	iap->ia_mtime.tv_sec = tmp;
	127	iap->ia_mtime.tv_nsec = tmp1 * 1000;
	128	/*
	129	* Passing the invalid value useconds=1000000 for mtime
	130	* is a Sun convention for "set both mtime and atime to
	131	* current server time". It's needed to make permissions
	132	* checks for the "touch" program across v2 mounts to
	133	* Solaris and Irix boxes work correctly. See description of
	134	* sattr in section 6.1 of "NFS Illustrated" by
	135	* Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5
	136	*/
	137	if (tmp1 == 1000000)
	138	iap->ia_valid &= ~(ATTR_ATIME_SET\|ATTR_MTIME_SET);
	139	}
	140	return p;
	141	}
	142
131a21c2 AV	143	static __be32 *
131a21c2 AV	144	encode_fattr(struct svc_rqst rqstp, __be32 p, struct svc_fh *fhp,
a334de28	145	struct kstat *stat)
1da177e4	146	{
1da177e4	147	struct dentry *dentry = fhp->fh_dentry;
1da177e4 LT	148	int type;
1da177e4 LT	149	struct timespec time;
af6a4e28	150	u32 f;
1da177e4	151
a334de28	152	type = (stat->mode & S_IFMT);
1da177e4 LT	153
1da177e4 LT	154	*p++ = htonl(nfs_ftypes[type >> 12]);
082f31a2	155	*p++ = htonl((u32) stat->mode);
a334de28	156	*p++ = htonl((u32) stat->nlink);
7c19723e EB	157	*p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
7c19723e EB	158	*p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid));
1da177e4	159
a334de28	160	if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN) {
1da177e4 LT	161	*p++ = htonl(NFS_MAXPATHLEN);
1da177e4 LT	162	} else {
a334de28	163	*p++ = htonl((u32) stat->size);
1da177e4	164	}
a334de28	165	*p++ = htonl((u32) stat->blksize);
1da177e4	166	if (S_ISCHR(type) \|\| S_ISBLK(type))
a334de28	167	*p++ = htonl(new_encode_dev(stat->rdev));
1da177e4 LT	168	else
1da177e4 LT	169	*p++ = htonl(0xffffffff);
a334de28	170	*p++ = htonl((u32) stat->blocks);
af6a4e28 N	171	switch (fsid_source(fhp)) {
	172	default:
	173	case FSIDSOURCE_DEV:
a334de28	174	*p++ = htonl(new_encode_dev(stat->dev));
af6a4e28 N	175	break;
	176	case FSIDSOURCE_FSID:
	177	*p++ = htonl((u32) fhp->fh_export->ex_fsid);
	178	break;
	179	case FSIDSOURCE_UUID:
	180	f = ((u32*)fhp->fh_export->ex_uuid)[0];
	181	f ^= ((u32*)fhp->fh_export->ex_uuid)[1];
	182	f ^= ((u32*)fhp->fh_export->ex_uuid)[2];
	183	f ^= ((u32*)fhp->fh_export->ex_uuid)[3];
	184	*p++ = htonl(f);
	185	break;
	186	}
a334de28 DS	187	*p++ = htonl((u32) stat->ino);
	188	*p++ = htonl((u32) stat->atime.tv_sec);
	189	*p++ = htonl(stat->atime.tv_nsec ? stat->atime.tv_nsec / 1000 : 0);
2b0143b5	190	lease_get_mtime(d_inode(dentry), &time);
1da177e4 LT	191	*p++ = htonl((u32) time.tv_sec);
1da177e4 LT	192	*p++ = htonl(time.tv_nsec ? time.tv_nsec / 1000 : 0);
a334de28 DS	193	*p++ = htonl((u32) stat->ctime.tv_sec);
a334de28 DS	194	*p++ = htonl(stat->ctime.tv_nsec ? stat->ctime.tv_nsec / 1000 : 0);
1da177e4 LT	195
	196	return p;
	197	}
	198
a257cdd0	199	/* Helper function for NFSv2 ACL code */
4f4a4fad	200	__be32 nfs2svc_encode_fattr(struct svc_rqst rqstp, __be32 p, struct svc_fh fhp, struct kstat *stat)
a257cdd0	201	{
4f4a4fad	202	return encode_fattr(rqstp, p, fhp, stat);
a257cdd0	203	}
1da177e4 LT	204
	205	/*
	206	* XDR decode functions
	207	*/
	208	int
131a21c2	209	nfssvc_decode_void(struct svc_rqst rqstp, __be32 p, void *dummy)
1da177e4 LT	210	{
	211	return xdr_argsize_check(rqstp, p);
	212	}
	213
	214	int
131a21c2	215	nfssvc_decode_fhandle(struct svc_rqst rqstp, __be32 p, struct nfsd_fhandle *args)
1da177e4	216	{
d40aa337 BT	217	p = decode_fh(p, &args->fh);
d40aa337 BT	218	if (!p)
1da177e4 LT	219	return 0;
	220	return xdr_argsize_check(rqstp, p);
	221	}
	222
	223	int
131a21c2	224	nfssvc_decode_sattrargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	225	struct nfsd_sattrargs *args)
1da177e4 LT	226	{
072f62ed N	227	p = decode_fh(p, &args->fh);
072f62ed N	228	if (!p)
1da177e4	229	return 0;
072f62ed	230	p = decode_sattr(p, &args->attrs);
1da177e4 LT	231
	232	return xdr_argsize_check(rqstp, p);
	233	}
	234
	235	int
131a21c2	236	nfssvc_decode_diropargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	237	struct nfsd_diropargs *args)
	238	{
	239	if (!(p = decode_fh(p, &args->fh))
	240	\|\| !(p = decode_filename(p, &args->name, &args->len)))
	241	return 0;
	242
d28c442f	243	return xdr_argsize_check(rqstp, p);
1da177e4 LT	244	}
	245
	246	int
131a21c2	247	nfssvc_decode_readargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	248	struct nfsd_readargs *args)
	249	{
	250	unsigned int len;
afc59400	251	int v;
d40aa337 BT	252	p = decode_fh(p, &args->fh);
d40aa337 BT	253	if (!p)
1da177e4 LT	254	return 0;
	255
	256	args->offset = ntohl(*p++);
	257	len = args->count = ntohl(*p++);
	258	p++; /* totalcount - unused */
	259
51f56777 BF	260	if (!xdr_argsize_check(rqstp, p))
	261	return 0;
	262
3c7aa15d	263	len = min_t(unsigned int, len, NFSSVC_MAXBLKSIZE_V2);
1da177e4 LT	264
	265	/* set up somewhere to store response.
	266	* We take pages, put them on reslist and include in iovec
	267	*/
	268	v=0;
	269	while (len > 0) {
afc59400 BF	270	struct page p = (rqstp->rq_next_page++);
	271
	272	rqstp->rq_vec[v].iov_base = page_address(p);
3c7aa15d	273	rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
3cc03b16	274	len -= rqstp->rq_vec[v].iov_len;
1da177e4 LT	275	v++;
	276	}
	277	args->vlen = v;
51f56777	278	return 1;
1da177e4 LT	279	}
	280
	281	int
131a21c2	282	nfssvc_decode_writeargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	283	struct nfsd_writeargs *args)
1da177e4 LT	284	{
f34b9568	285	unsigned int len, hdr, dlen;
db44bac4	286	struct kvec *head = rqstp->rq_arg.head;
1da177e4	287	int v;
f34b9568	288
d40aa337 BT	289	p = decode_fh(p, &args->fh);
d40aa337 BT	290	if (!p)
1da177e4 LT	291	return 0;
	292
	293	p++; /* beginoffset */
	294	args->offset = ntohl(p++); / offset */
	295	p++; /* totalcount */
	296	len = args->len = ntohl(*p++);
f34b9568 PS	297	/*
	298	* The protocol specifies a maximum of 8192 bytes.
	299	*/
7adae489	300	if (len > NFSSVC_MAXBLKSIZE_V2)
f34b9568 PS	301	return 0;
	302
	303	/*
	304	* Check to make sure that we got the right number of
	305	* bytes.
f34b9568	306	*/
db44bac4	307	hdr = (void*)p - head->iov_base;
13bf9fbf BF	308	if (hdr > head->iov_len)
13bf9fbf BF	309	return 0;
db44bac4	310	dlen = head->iov_len + rqstp->rq_arg.page_len - hdr;
072f62ed	311
f34b9568 PS	312	/*
	313	* Round the length of the data which was specified up to
	314	* the next multiple of XDR units and then compare that
	315	* against the length which was actually received.
ba67a39e N	316	* Note that when RPCSEC/GSS (for example) is used, the
	317	* data buffer can be padded so dlen might be larger
	318	* than required. It must never be smaller.
f34b9568	319	*/
ba67a39e	320	if (dlen < XDR_QUADLEN(len)*4)
f34b9568 PS	321	return 0;
	322
	323	rqstp->rq_vec[0].iov_base = (void*)p;
db44bac4	324	rqstp->rq_vec[0].iov_len = head->iov_len - hdr;
1da177e4	325	v = 0;
3cc03b16 N	326	while (len > rqstp->rq_vec[v].iov_len) {
3cc03b16 N	327	len -= rqstp->rq_vec[v].iov_len;
1da177e4	328	v++;
3cc03b16 N	329	rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
3cc03b16 N	330	rqstp->rq_vec[v].iov_len = PAGE_SIZE;
1da177e4	331	}
3cc03b16	332	rqstp->rq_vec[v].iov_len = len;
f34b9568 PS	333	args->vlen = v + 1;
f34b9568 PS	334	return 1;
1da177e4 LT	335	}
	336
	337	int
131a21c2	338	nfssvc_decode_createargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	339	struct nfsd_createargs *args)
1da177e4 LT	340	{
072f62ed N	341	if ( !(p = decode_fh(p, &args->fh))
072f62ed N	342	\|\| !(p = decode_filename(p, &args->name, &args->len)))
1da177e4	343	return 0;
072f62ed	344	p = decode_sattr(p, &args->attrs);
1da177e4 LT	345
	346	return xdr_argsize_check(rqstp, p);
	347	}
	348
	349	int
131a21c2	350	nfssvc_decode_renameargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	351	struct nfsd_renameargs *args)
	352	{
	353	if (!(p = decode_fh(p, &args->ffh))
	354	\|\| !(p = decode_filename(p, &args->fname, &args->flen))
	355	\|\| !(p = decode_fh(p, &args->tfh))
	356	\|\| !(p = decode_filename(p, &args->tname, &args->tlen)))
	357	return 0;
	358
	359	return xdr_argsize_check(rqstp, p);
	360	}
	361
	362	int
131a21c2	363	nfssvc_decode_readlinkargs(struct svc_rqst rqstp, __be32 p, struct nfsd_readlinkargs *args)
1da177e4	364	{
d40aa337 BT	365	p = decode_fh(p, &args->fh);
d40aa337 BT	366	if (!p)
1da177e4	367	return 0;
51f56777 BF	368	if (!xdr_argsize_check(rqstp, p))
51f56777 BF	369	return 0;
afc59400	370	args->buffer = page_address(*(rqstp->rq_next_page++));
1da177e4	371
51f56777	372	return 1;
1da177e4 LT	373	}
	374
	375	int
131a21c2	376	nfssvc_decode_linkargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	377	struct nfsd_linkargs *args)
	378	{
	379	if (!(p = decode_fh(p, &args->ffh))
	380	\|\| !(p = decode_fh(p, &args->tfh))
	381	\|\| !(p = decode_filename(p, &args->tname, &args->tlen)))
	382	return 0;
	383
	384	return xdr_argsize_check(rqstp, p);
	385	}
	386
	387	int
131a21c2	388	nfssvc_decode_symlinkargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	389	struct nfsd_symlinkargs *args)
1da177e4 LT	390	{
072f62ed N	391	if ( !(p = decode_fh(p, &args->ffh))
	392	\|\| !(p = decode_filename(p, &args->fname, &args->flen))
	393	\|\| !(p = decode_pathname(p, &args->tname, &args->tlen)))
1da177e4	394	return 0;
072f62ed	395	p = decode_sattr(p, &args->attrs);
1da177e4 LT	396
	397	return xdr_argsize_check(rqstp, p);
	398	}
	399
	400	int
131a21c2	401	nfssvc_decode_readdirargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	402	struct nfsd_readdirargs *args)
1da177e4 LT	403	{
d40aa337 BT	404	p = decode_fh(p, &args->fh);
d40aa337 BT	405	if (!p)
1da177e4 LT	406	return 0;
	407	args->cookie = ntohl(*p++);
	408	args->count = ntohl(*p++);
3c7aa15d	409	args->count = min_t(u32, args->count, PAGE_SIZE);
51f56777 BF	410	if (!xdr_argsize_check(rqstp, p))
51f56777 BF	411	return 0;
afc59400	412	args->buffer = page_address(*(rqstp->rq_next_page++));
1da177e4	413
51f56777	414	return 1;
1da177e4 LT	415	}
	416
	417	/*
	418	* XDR encode functions
	419	*/
	420	int
131a21c2	421	nfssvc_encode_void(struct svc_rqst rqstp, __be32 p, void *dummy)
1da177e4 LT	422	{
	423	return xdr_ressize_check(rqstp, p);
	424	}
	425
	426	int
131a21c2	427	nfssvc_encode_attrstat(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	428	struct nfsd_attrstat *resp)
1da177e4 LT	429	{
a334de28	430	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
1da177e4 LT	431	return xdr_ressize_check(rqstp, p);
	432	}
	433
	434	int
131a21c2	435	nfssvc_encode_diropres(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	436	struct nfsd_diropres *resp)
	437	{
	438	p = encode_fh(p, &resp->fh);
a334de28	439	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
1da177e4 LT	440	return xdr_ressize_check(rqstp, p);
	441	}
	442
	443	int
131a21c2	444	nfssvc_encode_readlinkres(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	445	struct nfsd_readlinkres *resp)
	446	{
	447	*p++ = htonl(resp->len);
	448	xdr_ressize_check(rqstp, p);
	449	rqstp->rq_res.page_len = resp->len;
	450	if (resp->len & 3) {
	451	/* need to pad the tail */
1da177e4 LT	452	rqstp->rq_res.tail[0].iov_base = p;
	453	*p = 0;
	454	rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
	455	}
	456	return 1;
	457	}
	458
	459	int
131a21c2	460	nfssvc_encode_readres(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	461	struct nfsd_readres *resp)
1da177e4 LT	462	{
a334de28	463	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
1da177e4 LT	464	*p++ = htonl(resp->count);
	465	xdr_ressize_check(rqstp, p);
	466
25985edc	467	/* now update rqstp->rq_res to reflect data as well */
1da177e4 LT	468	rqstp->rq_res.page_len = resp->count;
	469	if (resp->count & 3) {
	470	/* need to pad the tail */
1da177e4 LT	471	rqstp->rq_res.tail[0].iov_base = p;
	472	*p = 0;
	473	rqstp->rq_res.tail[0].iov_len = 4 - (resp->count&3);
	474	}
	475	return 1;
	476	}
	477
	478	int
131a21c2	479	nfssvc_encode_readdirres(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	480	struct nfsd_readdirres *resp)
	481	{
	482	xdr_ressize_check(rqstp, p);
	483	p = resp->buffer;
	484	p++ = 0; / no more entries */
	485	*p++ = htonl((resp->common.err == nfserr_eof));
	486	rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1;
	487
	488	return 1;
	489	}
	490
	491	int
131a21c2	492	nfssvc_encode_statfsres(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	493	struct nfsd_statfsres *resp)
	494	{
	495	struct kstatfs *stat = &resp->stats;
	496
7adae489	497	p++ = htonl(NFSSVC_MAXBLKSIZE_V2); / max transfer size */
1da177e4 LT	498	*p++ = htonl(stat->f_bsize);
	499	*p++ = htonl(stat->f_blocks);
	500	*p++ = htonl(stat->f_bfree);
	501	*p++ = htonl(stat->f_bavail);
	502	return xdr_ressize_check(rqstp, p);
	503	}
	504
	505	int
a0ad13ef N	506	nfssvc_encode_entry(void ccdv, const char name,
a0ad13ef N	507	int namlen, loff_t offset, u64 ino, unsigned int d_type)
1da177e4	508	{
a0ad13ef	509	struct readdir_cd *ccd = ccdv;
1da177e4	510	struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common);
131a21c2	511	__be32 *p = cd->buffer;
1da177e4 LT	512	int buflen, slen;
	513
	514	/*
	515	dprintk("nfsd: entry(%.*s off %ld ino %ld)\n",
	516	namlen, name, offset, ino);
	517	*/
	518
	519	if (offset > ~((u32) 0)) {
	520	cd->common.err = nfserr_fbig;
	521	return -EINVAL;
	522	}
	523	if (cd->offset)
	524	*cd->offset = htonl(offset);
1da177e4	525
3c7aa15d KM	526	/* truncate filename */
3c7aa15d KM	527	namlen = min(namlen, NFS2_MAXNAMLEN);
1da177e4	528	slen = XDR_QUADLEN(namlen);
3c7aa15d	529
1da177e4 LT	530	if ((buflen = cd->buflen - slen - 4) < 0) {
	531	cd->common.err = nfserr_toosmall;
	532	return -EINVAL;
	533	}
40ee5dc6 PS	534	if (ino > ~((u32) 0)) {
	535	cd->common.err = nfserr_fbig;
	536	return -EINVAL;
	537	}
1da177e4 LT	538	p++ = xdr_one; / mark entry present */
	539	p++ = htonl((u32) ino); / file id */
	540	p = xdr_encode_array(p, name, namlen);/* name length & name */
	541	cd->offset = p; /* remember pointer */
131a21c2	542	p++ = htonl(~0U); / offset of next entry */
1da177e4 LT	543
	544	cd->buflen = buflen;
	545	cd->buffer = p;
	546	cd->common.err = nfs_ok;
	547	return 0;
	548	}
	549
	550	/*
	551	* XDR release functions
	552	*/
	553	int
131a21c2	554	nfssvc_release_fhandle(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	555	struct nfsd_fhandle *resp)
	556	{
	557	fh_put(&resp->fh);
	558	return 1;
	559	}