[linux-2.6-block.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"

#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_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);
	time = stat->mtime;
	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)
{
	return xdr_argsize_check(rqstp, p);
}

int
nfssvc_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
nfssvc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p)
{
	struct nfsd_sattrargs *args = rqstp->rq_argp;

	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 = 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
nfssvc_decode_readargs(struct svc_rqst *rqstp, __be32 *p)
{
	struct nfsd_readargs *args = rqstp->rq_argp;
	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 */

	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 xdr_argsize_check(rqstp, p);
}

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

	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;

	args->first.iov_base = (void *)p;
	args->first.iov_len = head->iov_len - hdr;
	return 1;
}

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

	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 = 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
nfssvc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p)
{
	struct nfsd_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
nfssvc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p)
{
	struct nfsd_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
nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p)
{
	struct nfsd_symlinkargs *args = rqstp->rq_argp;
	char *base = (char *)p;
	size_t xdrlen;

	if (   !(p = decode_fh(p, &args->ffh))
	    || !(p = decode_filename(p, &args->fname, &args->flen)))
		return 0;

	args->tlen = ntohl(*p++);
	if (args->tlen == 0)
		return 0;

	args->first.iov_base = p;
	args->first.iov_len = rqstp->rq_arg.head[0].iov_len;
	args->first.iov_len -= (char *)p - base;

	/* This request is never larger than a page. Therefore,
	 * transport will deliver either:
	 * 1. pathname in the pagelist -> sattr is in the tail.
	 * 2. everything in the head buffer -> sattr is in the head.
	 */
	if (rqstp->rq_arg.page_len) {
		if (args->tlen != rqstp->rq_arg.page_len)
			return 0;
		p = rqstp->rq_arg.tail[0].iov_base;
	} else {
		xdrlen = XDR_QUADLEN(args->tlen);
		if (xdrlen > args->first.iov_len - (8 * sizeof(__be32)))
			return 0;
		p += xdrlen;
	}
	decode_sattr(p, &args->attrs);

	return 1;
}

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

	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);
	args->buffer = page_address(*(rqstp->rq_next_page++));

	return xdr_argsize_check(rqstp, p);
}

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

int
nfssvc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p)
{
	struct nfsd_attrstat *resp = rqstp->rq_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 = rqstp->rq_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 = rqstp->rq_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 = rqstp->rq_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 = rqstp->rq_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 = rqstp->rq_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
 */
void
nfssvc_release_fhandle(struct svc_rqst *rqstp)
{
	struct nfsd_fhandle *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 LT	11
	12	#define NFSDDBG_FACILITY NFSDDBG_XDR
	13
1da177e4 LT	14	/*
	15	* Mapping of S_IF* types to NFS file types
	16	*/
	17	static u32 nfs_ftypes[] = {
	18	NFNON, NFCHR, NFCHR, NFBAD,
	19	NFDIR, NFBAD, NFBLK, NFBAD,
	20	NFREG, NFBAD, NFLNK, NFBAD,
	21	NFSOCK, NFBAD, NFLNK, NFBAD,
	22	};
	23
	24
	25	/*
	26	* XDR functions for basic NFS types
	27	*/
131a21c2 AV	28	static __be32 *
131a21c2 AV	29	decode_fh(__be32 p, struct svc_fh fhp)
1da177e4 LT	30	{
	31	fh_init(fhp, NFS_FHSIZE);
	32	memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE);
	33	fhp->fh_handle.fh_size = NFS_FHSIZE;
	34
	35	/* FIXME: Look up export pointer here and verify
	36	* Sun Secure RPC if requested */
	37	return p + (NFS_FHSIZE >> 2);
	38	}
	39
a257cdd0	40	/* Helper function for NFSv2 ACL code */
131a21c2	41	__be32 nfs2svc_decode_fh(__be32 p, struct svc_fh *fhp)
a257cdd0 AG	42	{
	43	return decode_fh(p, fhp);
	44	}
	45
3ee6f61c	46	static __be32 *
131a21c2	47	encode_fh(__be32 p, struct svc_fh fhp)
1da177e4 LT	48	{
	49	memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE);
	50	return p + (NFS_FHSIZE>> 2);
	51	}
	52
	53	/*
	54	* Decode a file name and make sure that the path contains
	55	* no slashes or null bytes.
	56	*/
3ee6f61c	57	static __be32 *
ee1a95b3	58	decode_filename(__be32 p, char namp, unsigned int lenp)
1da177e4 LT	59	{
1da177e4 LT	60	char *name;
ee1a95b3	61	unsigned int i;
1da177e4 LT	62
	63	if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXNAMLEN)) != NULL) {
	64	for (i = 0, name = namp; i < lenp; i++, name++) {
	65	if (name == '\0' \|\| name == '/')
	66	return NULL;
	67	}
	68	}
	69
	70	return p;
	71	}
	72
3ee6f61c	73	static __be32 *
131a21c2	74	decode_sattr(__be32 p, struct iattr iap)
1da177e4 LT	75	{
	76	u32 tmp, tmp1;
	77
	78	iap->ia_valid = 0;
	79
	80	/* Sun client bug compatibility check: some sun clients seem to
	81	* put 0xffff in the mode field when they mean 0xffffffff.
	82	* Quoting the 4.4BSD nfs server code: Nah nah nah nah na nah.
	83	*/
	84	if ((tmp = ntohl(*p++)) != (u32)-1 && tmp != 0xffff) {
	85	iap->ia_valid \|= ATTR_MODE;
	86	iap->ia_mode = tmp;
	87	}
	88	if ((tmp = ntohl(*p++)) != (u32)-1) {
7c19723e EB	89	iap->ia_uid = make_kuid(&init_user_ns, tmp);
	90	if (uid_valid(iap->ia_uid))
	91	iap->ia_valid \|= ATTR_UID;
1da177e4 LT	92	}
1da177e4 LT	93	if ((tmp = ntohl(*p++)) != (u32)-1) {
7c19723e EB	94	iap->ia_gid = make_kgid(&init_user_ns, tmp);
	95	if (gid_valid(iap->ia_gid))
	96	iap->ia_valid \|= ATTR_GID;
1da177e4 LT	97	}
	98	if ((tmp = ntohl(*p++)) != (u32)-1) {
	99	iap->ia_valid \|= ATTR_SIZE;
	100	iap->ia_size = tmp;
	101	}
	102	tmp = ntohl(p++); tmp1 = ntohl(p++);
	103	if (tmp != (u32)-1 && tmp1 != (u32)-1) {
	104	iap->ia_valid \|= ATTR_ATIME \| ATTR_ATIME_SET;
	105	iap->ia_atime.tv_sec = tmp;
	106	iap->ia_atime.tv_nsec = tmp1 * 1000;
	107	}
	108	tmp = ntohl(p++); tmp1 = ntohl(p++);
	109	if (tmp != (u32)-1 && tmp1 != (u32)-1) {
	110	iap->ia_valid \|= ATTR_MTIME \| ATTR_MTIME_SET;
	111	iap->ia_mtime.tv_sec = tmp;
	112	iap->ia_mtime.tv_nsec = tmp1 * 1000;
	113	/*
	114	* Passing the invalid value useconds=1000000 for mtime
	115	* is a Sun convention for "set both mtime and atime to
	116	* current server time". It's needed to make permissions
	117	* checks for the "touch" program across v2 mounts to
	118	* Solaris and Irix boxes work correctly. See description of
	119	* sattr in section 6.1 of "NFS Illustrated" by
	120	* Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5
	121	*/
	122	if (tmp1 == 1000000)
	123	iap->ia_valid &= ~(ATTR_ATIME_SET\|ATTR_MTIME_SET);
	124	}
	125	return p;
	126	}
	127
131a21c2 AV	128	static __be32 *
131a21c2 AV	129	encode_fattr(struct svc_rqst rqstp, __be32 p, struct svc_fh *fhp,
a334de28	130	struct kstat *stat)
1da177e4	131	{
1da177e4	132	struct dentry *dentry = fhp->fh_dentry;
1da177e4 LT	133	int type;
1da177e4 LT	134	struct timespec time;
af6a4e28	135	u32 f;
1da177e4	136
a334de28	137	type = (stat->mode & S_IFMT);
1da177e4 LT	138
1da177e4 LT	139	*p++ = htonl(nfs_ftypes[type >> 12]);
082f31a2	140	*p++ = htonl((u32) stat->mode);
a334de28	141	*p++ = htonl((u32) stat->nlink);
7c19723e EB	142	*p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
7c19723e EB	143	*p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid));
1da177e4	144
a334de28	145	if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN) {
1da177e4 LT	146	*p++ = htonl(NFS_MAXPATHLEN);
1da177e4 LT	147	} else {
a334de28	148	*p++ = htonl((u32) stat->size);
1da177e4	149	}
a334de28	150	*p++ = htonl((u32) stat->blksize);
1da177e4	151	if (S_ISCHR(type) \|\| S_ISBLK(type))
a334de28	152	*p++ = htonl(new_encode_dev(stat->rdev));
1da177e4 LT	153	else
1da177e4 LT	154	*p++ = htonl(0xffffffff);
a334de28	155	*p++ = htonl((u32) stat->blocks);
af6a4e28 N	156	switch (fsid_source(fhp)) {
	157	default:
	158	case FSIDSOURCE_DEV:
a334de28	159	*p++ = htonl(new_encode_dev(stat->dev));
af6a4e28 N	160	break;
	161	case FSIDSOURCE_FSID:
	162	*p++ = htonl((u32) fhp->fh_export->ex_fsid);
	163	break;
	164	case FSIDSOURCE_UUID:
	165	f = ((u32*)fhp->fh_export->ex_uuid)[0];
	166	f ^= ((u32*)fhp->fh_export->ex_uuid)[1];
	167	f ^= ((u32*)fhp->fh_export->ex_uuid)[2];
	168	f ^= ((u32*)fhp->fh_export->ex_uuid)[3];
	169	*p++ = htonl(f);
	170	break;
	171	}
a334de28 DS	172	*p++ = htonl((u32) stat->ino);
	173	*p++ = htonl((u32) stat->atime.tv_sec);
	174	*p++ = htonl(stat->atime.tv_nsec ? stat->atime.tv_nsec / 1000 : 0);
76c47948	175	time = stat->mtime;
2b0143b5	176	lease_get_mtime(d_inode(dentry), &time);
1da177e4 LT	177	*p++ = htonl((u32) time.tv_sec);
1da177e4 LT	178	*p++ = htonl(time.tv_nsec ? time.tv_nsec / 1000 : 0);
a334de28 DS	179	*p++ = htonl((u32) stat->ctime.tv_sec);
a334de28 DS	180	*p++ = htonl(stat->ctime.tv_nsec ? stat->ctime.tv_nsec / 1000 : 0);
1da177e4 LT	181
	182	return p;
	183	}
	184
a257cdd0	185	/* Helper function for NFSv2 ACL code */
4f4a4fad	186	__be32 nfs2svc_encode_fattr(struct svc_rqst rqstp, __be32 p, struct svc_fh fhp, struct kstat *stat)
a257cdd0	187	{
4f4a4fad	188	return encode_fattr(rqstp, p, fhp, stat);
a257cdd0	189	}
1da177e4 LT	190
	191	/*
	192	* XDR decode functions
	193	*/
	194	int
026fec7e	195	nfssvc_decode_void(struct svc_rqst rqstp, __be32 p)
1da177e4 LT	196	{
	197	return xdr_argsize_check(rqstp, p);
	198	}
	199
	200	int
026fec7e	201	nfssvc_decode_fhandle(struct svc_rqst rqstp, __be32 p)
1da177e4	202	{
026fec7e CH	203	struct nfsd_fhandle *args = rqstp->rq_argp;
026fec7e CH	204
d40aa337 BT	205	p = decode_fh(p, &args->fh);
d40aa337 BT	206	if (!p)
1da177e4 LT	207	return 0;
	208	return xdr_argsize_check(rqstp, p);
	209	}
	210
	211	int
026fec7e	212	nfssvc_decode_sattrargs(struct svc_rqst rqstp, __be32 p)
1da177e4	213	{
026fec7e CH	214	struct nfsd_sattrargs *args = rqstp->rq_argp;
026fec7e CH	215
072f62ed N	216	p = decode_fh(p, &args->fh);
072f62ed N	217	if (!p)
1da177e4	218	return 0;
072f62ed	219	p = decode_sattr(p, &args->attrs);
1da177e4 LT	220
	221	return xdr_argsize_check(rqstp, p);
	222	}
	223
	224	int
026fec7e	225	nfssvc_decode_diropargs(struct svc_rqst rqstp, __be32 p)
1da177e4	226	{
026fec7e CH	227	struct nfsd_diropargs *args = rqstp->rq_argp;
026fec7e CH	228
1da177e4 LT	229	if (!(p = decode_fh(p, &args->fh))
	230	\|\| !(p = decode_filename(p, &args->name, &args->len)))
	231	return 0;
	232
d28c442f	233	return xdr_argsize_check(rqstp, p);
1da177e4 LT	234	}
	235
	236	int
026fec7e	237	nfssvc_decode_readargs(struct svc_rqst rqstp, __be32 p)
1da177e4	238	{
026fec7e	239	struct nfsd_readargs *args = rqstp->rq_argp;
1da177e4	240	unsigned int len;
afc59400	241	int v;
d40aa337 BT	242	p = decode_fh(p, &args->fh);
d40aa337 BT	243	if (!p)
1da177e4 LT	244	return 0;
	245
	246	args->offset = ntohl(*p++);
	247	len = args->count = ntohl(*p++);
	248	p++; /* totalcount - unused */
	249
3c7aa15d	250	len = min_t(unsigned int, len, NFSSVC_MAXBLKSIZE_V2);
1da177e4 LT	251
	252	/* set up somewhere to store response.
	253	* We take pages, put them on reslist and include in iovec
	254	*/
	255	v=0;
	256	while (len > 0) {
afc59400 BF	257	struct page p = (rqstp->rq_next_page++);
	258
	259	rqstp->rq_vec[v].iov_base = page_address(p);
3c7aa15d	260	rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
3cc03b16	261	len -= rqstp->rq_vec[v].iov_len;
1da177e4 LT	262	v++;
	263	}
	264	args->vlen = v;
9512a16b	265	return xdr_argsize_check(rqstp, p);
1da177e4 LT	266	}
	267
	268	int
026fec7e	269	nfssvc_decode_writeargs(struct svc_rqst rqstp, __be32 p)
1da177e4	270	{
026fec7e	271	struct nfsd_writeargs *args = rqstp->rq_argp;
f34b9568	272	unsigned int len, hdr, dlen;
db44bac4	273	struct kvec *head = rqstp->rq_arg.head;
f34b9568	274
d40aa337 BT	275	p = decode_fh(p, &args->fh);
d40aa337 BT	276	if (!p)
1da177e4 LT	277	return 0;
	278
	279	p++; /* beginoffset */
	280	args->offset = ntohl(p++); / offset */
	281	p++; /* totalcount */
	282	len = args->len = ntohl(*p++);
f34b9568 PS	283	/*
	284	* The protocol specifies a maximum of 8192 bytes.
	285	*/
7adae489	286	if (len > NFSSVC_MAXBLKSIZE_V2)
f34b9568 PS	287	return 0;
	288
	289	/*
	290	* Check to make sure that we got the right number of
	291	* bytes.
f34b9568	292	*/
db44bac4	293	hdr = (void*)p - head->iov_base;
13bf9fbf BF	294	if (hdr > head->iov_len)
13bf9fbf BF	295	return 0;
db44bac4	296	dlen = head->iov_len + rqstp->rq_arg.page_len - hdr;
072f62ed	297
f34b9568 PS	298	/*
	299	* Round the length of the data which was specified up to
	300	* the next multiple of XDR units and then compare that
	301	* against the length which was actually received.
ba67a39e N	302	* Note that when RPCSEC/GSS (for example) is used, the
	303	* data buffer can be padded so dlen might be larger
	304	* than required. It must never be smaller.
f34b9568	305	*/
ba67a39e	306	if (dlen < XDR_QUADLEN(len)*4)
f34b9568 PS	307	return 0;
f34b9568 PS	308
8154ef27 CL	309	args->first.iov_base = (void *)p;
8154ef27 CL	310	args->first.iov_len = head->iov_len - hdr;
f34b9568	311	return 1;
1da177e4 LT	312	}
	313
	314	int
026fec7e	315	nfssvc_decode_createargs(struct svc_rqst rqstp, __be32 p)
1da177e4	316	{
026fec7e CH	317	struct nfsd_createargs *args = rqstp->rq_argp;
026fec7e CH	318
072f62ed N	319	if ( !(p = decode_fh(p, &args->fh))
072f62ed N	320	\|\| !(p = decode_filename(p, &args->name, &args->len)))
1da177e4	321	return 0;
072f62ed	322	p = decode_sattr(p, &args->attrs);
1da177e4 LT	323
	324	return xdr_argsize_check(rqstp, p);
	325	}
	326
	327	int
026fec7e	328	nfssvc_decode_renameargs(struct svc_rqst rqstp, __be32 p)
1da177e4	329	{
026fec7e CH	330	struct nfsd_renameargs *args = rqstp->rq_argp;
026fec7e CH	331
1da177e4 LT	332	if (!(p = decode_fh(p, &args->ffh))
	333	\|\| !(p = decode_filename(p, &args->fname, &args->flen))
	334	\|\| !(p = decode_fh(p, &args->tfh))
	335	\|\| !(p = decode_filename(p, &args->tname, &args->tlen)))
	336	return 0;
	337
	338	return xdr_argsize_check(rqstp, p);
	339	}
	340
	341	int
026fec7e	342	nfssvc_decode_readlinkargs(struct svc_rqst rqstp, __be32 p)
1da177e4	343	{
026fec7e CH	344	struct nfsd_readlinkargs *args = rqstp->rq_argp;
026fec7e CH	345
d40aa337 BT	346	p = decode_fh(p, &args->fh);
d40aa337 BT	347	if (!p)
1da177e4	348	return 0;
afc59400	349	args->buffer = page_address(*(rqstp->rq_next_page++));
1da177e4	350
9512a16b	351	return xdr_argsize_check(rqstp, p);
1da177e4 LT	352	}
	353
	354	int
026fec7e	355	nfssvc_decode_linkargs(struct svc_rqst rqstp, __be32 p)
1da177e4	356	{
026fec7e CH	357	struct nfsd_linkargs *args = rqstp->rq_argp;
026fec7e CH	358
1da177e4 LT	359	if (!(p = decode_fh(p, &args->ffh))
	360	\|\| !(p = decode_fh(p, &args->tfh))
	361	\|\| !(p = decode_filename(p, &args->tname, &args->tlen)))
	362	return 0;
	363
	364	return xdr_argsize_check(rqstp, p);
	365	}
	366
	367	int
026fec7e	368	nfssvc_decode_symlinkargs(struct svc_rqst rqstp, __be32 p)
1da177e4	369	{
026fec7e	370	struct nfsd_symlinkargs *args = rqstp->rq_argp;
38a70315 CL	371	char base = (char )p;
38a70315 CL	372	size_t xdrlen;
026fec7e	373
072f62ed	374	if ( !(p = decode_fh(p, &args->ffh))
38a70315	375	\|\| !(p = decode_filename(p, &args->fname, &args->flen)))
1da177e4 LT	376	return 0;
1da177e4 LT	377
38a70315 CL	378	args->tlen = ntohl(*p++);
	379	if (args->tlen == 0)
	380	return 0;
	381
	382	args->first.iov_base = p;
	383	args->first.iov_len = rqstp->rq_arg.head[0].iov_len;
	384	args->first.iov_len -= (char *)p - base;
	385
	386	/* This request is never larger than a page. Therefore,
	387	* transport will deliver either:
	388	* 1. pathname in the pagelist -> sattr is in the tail.
	389	* 2. everything in the head buffer -> sattr is in the head.
	390	*/
	391	if (rqstp->rq_arg.page_len) {
	392	if (args->tlen != rqstp->rq_arg.page_len)
	393	return 0;
	394	p = rqstp->rq_arg.tail[0].iov_base;
	395	} else {
	396	xdrlen = XDR_QUADLEN(args->tlen);
	397	if (xdrlen > args->first.iov_len - (8 * sizeof(__be32)))
	398	return 0;
	399	p += xdrlen;
	400	}
	401	decode_sattr(p, &args->attrs);
	402
	403	return 1;
1da177e4 LT	404	}
	405
	406	int
026fec7e	407	nfssvc_decode_readdirargs(struct svc_rqst rqstp, __be32 p)
1da177e4	408	{
026fec7e CH	409	struct nfsd_readdirargs *args = rqstp->rq_argp;
026fec7e CH	410
d40aa337 BT	411	p = decode_fh(p, &args->fh);
d40aa337 BT	412	if (!p)
1da177e4 LT	413	return 0;
	414	args->cookie = ntohl(*p++);
	415	args->count = ntohl(*p++);
3c7aa15d	416	args->count = min_t(u32, args->count, PAGE_SIZE);
afc59400	417	args->buffer = page_address(*(rqstp->rq_next_page++));
1da177e4	418
9512a16b	419	return xdr_argsize_check(rqstp, p);
1da177e4 LT	420	}
	421
	422	/*
	423	* XDR encode functions
	424	*/
	425	int
63f8de37	426	nfssvc_encode_void(struct svc_rqst rqstp, __be32 p)
1da177e4 LT	427	{
	428	return xdr_ressize_check(rqstp, p);
	429	}
	430
	431	int
63f8de37	432	nfssvc_encode_attrstat(struct svc_rqst rqstp, __be32 p)
1da177e4	433	{
63f8de37 CH	434	struct nfsd_attrstat *resp = rqstp->rq_resp;
63f8de37 CH	435
a334de28	436	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
1da177e4 LT	437	return xdr_ressize_check(rqstp, p);
	438	}
	439
	440	int
63f8de37	441	nfssvc_encode_diropres(struct svc_rqst rqstp, __be32 p)
1da177e4	442	{
63f8de37 CH	443	struct nfsd_diropres *resp = rqstp->rq_resp;
63f8de37 CH	444
1da177e4	445	p = encode_fh(p, &resp->fh);
a334de28	446	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
1da177e4 LT	447	return xdr_ressize_check(rqstp, p);
	448	}
	449
	450	int
63f8de37	451	nfssvc_encode_readlinkres(struct svc_rqst rqstp, __be32 p)
1da177e4	452	{
63f8de37 CH	453	struct nfsd_readlinkres *resp = rqstp->rq_resp;
63f8de37 CH	454
1da177e4 LT	455	*p++ = htonl(resp->len);
	456	xdr_ressize_check(rqstp, p);
	457	rqstp->rq_res.page_len = resp->len;
	458	if (resp->len & 3) {
	459	/* need to pad the tail */
1da177e4 LT	460	rqstp->rq_res.tail[0].iov_base = p;
	461	*p = 0;
	462	rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
	463	}
	464	return 1;
	465	}
	466
	467	int
63f8de37	468	nfssvc_encode_readres(struct svc_rqst rqstp, __be32 p)
1da177e4	469	{
63f8de37 CH	470	struct nfsd_readres *resp = rqstp->rq_resp;
63f8de37 CH	471
a334de28	472	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
1da177e4 LT	473	*p++ = htonl(resp->count);
	474	xdr_ressize_check(rqstp, p);
	475
25985edc	476	/* now update rqstp->rq_res to reflect data as well */
1da177e4 LT	477	rqstp->rq_res.page_len = resp->count;
	478	if (resp->count & 3) {
	479	/* need to pad the tail */
1da177e4 LT	480	rqstp->rq_res.tail[0].iov_base = p;
	481	*p = 0;
	482	rqstp->rq_res.tail[0].iov_len = 4 - (resp->count&3);
	483	}
	484	return 1;
	485	}
	486
	487	int
63f8de37	488	nfssvc_encode_readdirres(struct svc_rqst rqstp, __be32 p)
1da177e4	489	{
63f8de37 CH	490	struct nfsd_readdirres *resp = rqstp->rq_resp;
63f8de37 CH	491
1da177e4 LT	492	xdr_ressize_check(rqstp, p);
	493	p = resp->buffer;
	494	p++ = 0; / no more entries */
	495	*p++ = htonl((resp->common.err == nfserr_eof));
	496	rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1;
	497
	498	return 1;
	499	}
	500
	501	int
63f8de37	502	nfssvc_encode_statfsres(struct svc_rqst rqstp, __be32 p)
1da177e4	503	{
63f8de37	504	struct nfsd_statfsres *resp = rqstp->rq_resp;
1da177e4 LT	505	struct kstatfs *stat = &resp->stats;
1da177e4 LT	506
7adae489	507	p++ = htonl(NFSSVC_MAXBLKSIZE_V2); / max transfer size */
1da177e4 LT	508	*p++ = htonl(stat->f_bsize);
	509	*p++ = htonl(stat->f_blocks);
	510	*p++ = htonl(stat->f_bfree);
	511	*p++ = htonl(stat->f_bavail);
	512	return xdr_ressize_check(rqstp, p);
	513	}
	514
	515	int
a0ad13ef N	516	nfssvc_encode_entry(void ccdv, const char name,
a0ad13ef N	517	int namlen, loff_t offset, u64 ino, unsigned int d_type)
1da177e4	518	{
a0ad13ef	519	struct readdir_cd *ccd = ccdv;
1da177e4	520	struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common);
131a21c2	521	__be32 *p = cd->buffer;
1da177e4 LT	522	int buflen, slen;
	523
	524	/*
	525	dprintk("nfsd: entry(%.*s off %ld ino %ld)\n",
	526	namlen, name, offset, ino);
	527	*/
	528
	529	if (offset > ~((u32) 0)) {
	530	cd->common.err = nfserr_fbig;
	531	return -EINVAL;
	532	}
	533	if (cd->offset)
	534	*cd->offset = htonl(offset);
1da177e4	535
3c7aa15d KM	536	/* truncate filename */
3c7aa15d KM	537	namlen = min(namlen, NFS2_MAXNAMLEN);
1da177e4	538	slen = XDR_QUADLEN(namlen);
3c7aa15d	539
1da177e4 LT	540	if ((buflen = cd->buflen - slen - 4) < 0) {
	541	cd->common.err = nfserr_toosmall;
	542	return -EINVAL;
	543	}
40ee5dc6 PS	544	if (ino > ~((u32) 0)) {
	545	cd->common.err = nfserr_fbig;
	546	return -EINVAL;
	547	}
1da177e4 LT	548	p++ = xdr_one; / mark entry present */
	549	p++ = htonl((u32) ino); / file id */
	550	p = xdr_encode_array(p, name, namlen);/* name length & name */
	551	cd->offset = p; /* remember pointer */
131a21c2	552	p++ = htonl(~0U); / offset of next entry */
1da177e4 LT	553
	554	cd->buflen = buflen;
	555	cd->buffer = p;
	556	cd->common.err = nfs_ok;
	557	return 0;
	558	}
	559
	560	/*
	561	* XDR release functions
	562	*/
8537488b CH	563	void
8537488b CH	564	nfssvc_release_fhandle(struct svc_rqst *rqstp)
1da177e4	565	{
8537488b CH	566	struct nfsd_fhandle *resp = rqstp->rq_resp;
8537488b CH	567
1da177e4	568	fh_put(&resp->fh);
1da177e4	569	}