[mirror_ubuntu-artful-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 */

	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)
{
	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;
	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)
{
	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);
	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, 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
3c7aa15d	260	len = min_t(unsigned int, len, NFSSVC_MAXBLKSIZE_V2);
1da177e4 LT	261
	262	/* set up somewhere to store response.
	263	* We take pages, put them on reslist and include in iovec
	264	*/
	265	v=0;
	266	while (len > 0) {
afc59400 BF	267	struct page p = (rqstp->rq_next_page++);
	268
	269	rqstp->rq_vec[v].iov_base = page_address(p);
3c7aa15d	270	rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
3cc03b16	271	len -= rqstp->rq_vec[v].iov_len;
1da177e4 LT	272	v++;
	273	}
	274	args->vlen = v;
	275	return xdr_argsize_check(rqstp, p);
	276	}
	277
	278	int
131a21c2	279	nfssvc_decode_writeargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	280	struct nfsd_writeargs *args)
1da177e4 LT	281	{
f34b9568	282	unsigned int len, hdr, dlen;
db44bac4	283	struct kvec *head = rqstp->rq_arg.head;
1da177e4	284	int v;
f34b9568	285
d40aa337 BT	286	p = decode_fh(p, &args->fh);
d40aa337 BT	287	if (!p)
1da177e4 LT	288	return 0;
	289
	290	p++; /* beginoffset */
	291	args->offset = ntohl(p++); / offset */
	292	p++; /* totalcount */
	293	len = args->len = ntohl(*p++);
f34b9568 PS	294	/*
	295	* The protocol specifies a maximum of 8192 bytes.
	296	*/
7adae489	297	if (len > NFSSVC_MAXBLKSIZE_V2)
f34b9568 PS	298	return 0;
	299
	300	/*
	301	* Check to make sure that we got the right number of
	302	* bytes.
f34b9568	303	*/
db44bac4	304	hdr = (void*)p - head->iov_base;
13bf9fbf BF	305	if (hdr > head->iov_len)
13bf9fbf BF	306	return 0;
db44bac4	307	dlen = head->iov_len + rqstp->rq_arg.page_len - hdr;
072f62ed	308
f34b9568 PS	309	/*
	310	* Round the length of the data which was specified up to
	311	* the next multiple of XDR units and then compare that
	312	* against the length which was actually received.
ba67a39e N	313	* Note that when RPCSEC/GSS (for example) is used, the
	314	* data buffer can be padded so dlen might be larger
	315	* than required. It must never be smaller.
f34b9568	316	*/
ba67a39e	317	if (dlen < XDR_QUADLEN(len)*4)
f34b9568 PS	318	return 0;
	319
	320	rqstp->rq_vec[0].iov_base = (void*)p;
db44bac4	321	rqstp->rq_vec[0].iov_len = head->iov_len - hdr;
1da177e4	322	v = 0;
3cc03b16 N	323	while (len > rqstp->rq_vec[v].iov_len) {
3cc03b16 N	324	len -= rqstp->rq_vec[v].iov_len;
1da177e4	325	v++;
3cc03b16 N	326	rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
3cc03b16 N	327	rqstp->rq_vec[v].iov_len = PAGE_SIZE;
1da177e4	328	}
3cc03b16	329	rqstp->rq_vec[v].iov_len = len;
f34b9568 PS	330	args->vlen = v + 1;
f34b9568 PS	331	return 1;
1da177e4 LT	332	}
	333
	334	int
131a21c2	335	nfssvc_decode_createargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	336	struct nfsd_createargs *args)
1da177e4 LT	337	{
072f62ed N	338	if ( !(p = decode_fh(p, &args->fh))
072f62ed N	339	\|\| !(p = decode_filename(p, &args->name, &args->len)))
1da177e4	340	return 0;
072f62ed	341	p = decode_sattr(p, &args->attrs);
1da177e4 LT	342
	343	return xdr_argsize_check(rqstp, p);
	344	}
	345
	346	int
131a21c2	347	nfssvc_decode_renameargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	348	struct nfsd_renameargs *args)
	349	{
	350	if (!(p = decode_fh(p, &args->ffh))
	351	\|\| !(p = decode_filename(p, &args->fname, &args->flen))
	352	\|\| !(p = decode_fh(p, &args->tfh))
	353	\|\| !(p = decode_filename(p, &args->tname, &args->tlen)))
	354	return 0;
	355
	356	return xdr_argsize_check(rqstp, p);
	357	}
	358
	359	int
131a21c2	360	nfssvc_decode_readlinkargs(struct svc_rqst rqstp, __be32 p, struct nfsd_readlinkargs *args)
1da177e4	361	{
d40aa337 BT	362	p = decode_fh(p, &args->fh);
d40aa337 BT	363	if (!p)
1da177e4	364	return 0;
afc59400	365	args->buffer = page_address(*(rqstp->rq_next_page++));
1da177e4 LT	366
	367	return xdr_argsize_check(rqstp, p);
	368	}
	369
	370	int
131a21c2	371	nfssvc_decode_linkargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	372	struct nfsd_linkargs *args)
	373	{
	374	if (!(p = decode_fh(p, &args->ffh))
	375	\|\| !(p = decode_fh(p, &args->tfh))
	376	\|\| !(p = decode_filename(p, &args->tname, &args->tlen)))
	377	return 0;
	378
	379	return xdr_argsize_check(rqstp, p);
	380	}
	381
	382	int
131a21c2	383	nfssvc_decode_symlinkargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	384	struct nfsd_symlinkargs *args)
1da177e4 LT	385	{
072f62ed N	386	if ( !(p = decode_fh(p, &args->ffh))
	387	\|\| !(p = decode_filename(p, &args->fname, &args->flen))
	388	\|\| !(p = decode_pathname(p, &args->tname, &args->tlen)))
1da177e4	389	return 0;
072f62ed	390	p = decode_sattr(p, &args->attrs);
1da177e4 LT	391
	392	return xdr_argsize_check(rqstp, p);
	393	}
	394
	395	int
131a21c2	396	nfssvc_decode_readdirargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	397	struct nfsd_readdirargs *args)
1da177e4 LT	398	{
d40aa337 BT	399	p = decode_fh(p, &args->fh);
d40aa337 BT	400	if (!p)
1da177e4 LT	401	return 0;
	402	args->cookie = ntohl(*p++);
	403	args->count = ntohl(*p++);
3c7aa15d	404	args->count = min_t(u32, args->count, PAGE_SIZE);
afc59400	405	args->buffer = page_address(*(rqstp->rq_next_page++));
1da177e4 LT	406
	407	return xdr_argsize_check(rqstp, p);
	408	}
	409
	410	/*
	411	* XDR encode functions
	412	*/
	413	int
131a21c2	414	nfssvc_encode_void(struct svc_rqst rqstp, __be32 p, void *dummy)
1da177e4 LT	415	{
	416	return xdr_ressize_check(rqstp, p);
	417	}
	418
	419	int
131a21c2	420	nfssvc_encode_attrstat(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	421	struct nfsd_attrstat *resp)
1da177e4 LT	422	{
a334de28	423	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
1da177e4 LT	424	return xdr_ressize_check(rqstp, p);
	425	}
	426
	427	int
131a21c2	428	nfssvc_encode_diropres(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	429	struct nfsd_diropres *resp)
	430	{
	431	p = encode_fh(p, &resp->fh);
a334de28	432	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
1da177e4 LT	433	return xdr_ressize_check(rqstp, p);
	434	}
	435
	436	int
131a21c2	437	nfssvc_encode_readlinkres(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	438	struct nfsd_readlinkres *resp)
	439	{
	440	*p++ = htonl(resp->len);
	441	xdr_ressize_check(rqstp, p);
	442	rqstp->rq_res.page_len = resp->len;
	443	if (resp->len & 3) {
	444	/* need to pad the tail */
1da177e4 LT	445	rqstp->rq_res.tail[0].iov_base = p;
	446	*p = 0;
	447	rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
	448	}
	449	return 1;
	450	}
	451
	452	int
131a21c2	453	nfssvc_encode_readres(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	454	struct nfsd_readres *resp)
1da177e4 LT	455	{
a334de28	456	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
1da177e4 LT	457	*p++ = htonl(resp->count);
	458	xdr_ressize_check(rqstp, p);
	459
25985edc	460	/* now update rqstp->rq_res to reflect data as well */
1da177e4 LT	461	rqstp->rq_res.page_len = resp->count;
	462	if (resp->count & 3) {
	463	/* need to pad the tail */
1da177e4 LT	464	rqstp->rq_res.tail[0].iov_base = p;
	465	*p = 0;
	466	rqstp->rq_res.tail[0].iov_len = 4 - (resp->count&3);
	467	}
	468	return 1;
	469	}
	470
	471	int
131a21c2	472	nfssvc_encode_readdirres(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	473	struct nfsd_readdirres *resp)
	474	{
	475	xdr_ressize_check(rqstp, p);
	476	p = resp->buffer;
	477	p++ = 0; / no more entries */
	478	*p++ = htonl((resp->common.err == nfserr_eof));
	479	rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1;
	480
	481	return 1;
	482	}
	483
	484	int
131a21c2	485	nfssvc_encode_statfsres(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	486	struct nfsd_statfsres *resp)
	487	{
	488	struct kstatfs *stat = &resp->stats;
	489
7adae489	490	p++ = htonl(NFSSVC_MAXBLKSIZE_V2); / max transfer size */
1da177e4 LT	491	*p++ = htonl(stat->f_bsize);
	492	*p++ = htonl(stat->f_blocks);
	493	*p++ = htonl(stat->f_bfree);
	494	*p++ = htonl(stat->f_bavail);
	495	return xdr_ressize_check(rqstp, p);
	496	}
	497
	498	int
a0ad13ef N	499	nfssvc_encode_entry(void ccdv, const char name,
a0ad13ef N	500	int namlen, loff_t offset, u64 ino, unsigned int d_type)
1da177e4	501	{
a0ad13ef	502	struct readdir_cd *ccd = ccdv;
1da177e4	503	struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common);
131a21c2	504	__be32 *p = cd->buffer;
1da177e4 LT	505	int buflen, slen;
	506
	507	/*
	508	dprintk("nfsd: entry(%.*s off %ld ino %ld)\n",
	509	namlen, name, offset, ino);
	510	*/
	511
	512	if (offset > ~((u32) 0)) {
	513	cd->common.err = nfserr_fbig;
	514	return -EINVAL;
	515	}
	516	if (cd->offset)
	517	*cd->offset = htonl(offset);
1da177e4	518
3c7aa15d KM	519	/* truncate filename */
3c7aa15d KM	520	namlen = min(namlen, NFS2_MAXNAMLEN);
1da177e4	521	slen = XDR_QUADLEN(namlen);
3c7aa15d	522
1da177e4 LT	523	if ((buflen = cd->buflen - slen - 4) < 0) {
	524	cd->common.err = nfserr_toosmall;
	525	return -EINVAL;
	526	}
40ee5dc6 PS	527	if (ino > ~((u32) 0)) {
	528	cd->common.err = nfserr_fbig;
	529	return -EINVAL;
	530	}
1da177e4 LT	531	p++ = xdr_one; / mark entry present */
	532	p++ = htonl((u32) ino); / file id */
	533	p = xdr_encode_array(p, name, namlen);/* name length & name */
	534	cd->offset = p; /* remember pointer */
131a21c2	535	p++ = htonl(~0U); / offset of next entry */
1da177e4 LT	536
	537	cd->buflen = buflen;
	538	cd->buffer = p;
	539	cd->common.err = nfs_ok;
	540	return 0;
	541	}
	542
	543	/*
	544	* XDR release functions
	545	*/
	546	int
131a21c2	547	nfssvc_release_fhandle(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	548	struct nfsd_fhandle *resp)
	549	{
	550	fh_put(&resp->fh);
	551	return 1;
	552	}