[linux-2.6-block.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(dentry->d_inode, &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)
{
	if (!(p = decode_fh(p, &args->fh)))
		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;
	if (!(p = decode_fh(p, &args->fh)))
		return 0;

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

	if (len > NFSSVC_MAXBLKSIZE_V2)
		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 = len < PAGE_SIZE?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;
	int v;

	if (!(p = decode_fh(p, &args->fh)))
		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 - rqstp->rq_arg.head[0].iov_base;
	dlen = rqstp->rq_arg.head[0].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 = rqstp->rq_arg.head[0].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)
{
	if (!(p = decode_fh(p, &args->fh)))
		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)
{
	if (!(p = decode_fh(p, &args->fh)))
		return 0;
	args->cookie = ntohl(*p++);
	args->count  = ntohl(*p++);
	if (args->count > PAGE_SIZE)
		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);
	if (namlen > NFS2_MAXNAMLEN)
		namlen = NFS2_MAXNAMLEN;/* truncate filename */

	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]);
a334de28 DS	155	*p++ = htonl((u32) stat->mode);
a334de28 DS	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);
1da177e4 LT	190	lease_get_mtime(dentry->d_inode, &time);
	191	*p++ = htonl((u32) time.tv_sec);
	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 LT	216	{
	217	if (!(p = decode_fh(p, &args->fh)))
	218	return 0;
	219	return xdr_argsize_check(rqstp, p);
	220	}
	221
	222	int
131a21c2	223	nfssvc_decode_sattrargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	224	struct nfsd_sattrargs *args)
1da177e4 LT	225	{
072f62ed N	226	p = decode_fh(p, &args->fh);
072f62ed N	227	if (!p)
1da177e4	228	return 0;
072f62ed	229	p = decode_sattr(p, &args->attrs);
1da177e4 LT	230
	231	return xdr_argsize_check(rqstp, p);
	232	}
	233
	234	int
131a21c2	235	nfssvc_decode_diropargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	236	struct nfsd_diropargs *args)
	237	{
	238	if (!(p = decode_fh(p, &args->fh))
	239	\|\| !(p = decode_filename(p, &args->name, &args->len)))
	240	return 0;
	241
	242	return xdr_argsize_check(rqstp, p);
	243	}
	244
	245	int
131a21c2	246	nfssvc_decode_readargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	247	struct nfsd_readargs *args)
	248	{
	249	unsigned int len;
afc59400	250	int v;
1da177e4 LT	251	if (!(p = decode_fh(p, &args->fh)))
	252	return 0;
	253
	254	args->offset = ntohl(*p++);
	255	len = args->count = ntohl(*p++);
	256	p++; /* totalcount - unused */
	257
7adae489 GB	258	if (len > NFSSVC_MAXBLKSIZE_V2)
7adae489 GB	259	len = NFSSVC_MAXBLKSIZE_V2;
1da177e4 LT	260
	261	/* set up somewhere to store response.
	262	* We take pages, put them on reslist and include in iovec
	263	*/
	264	v=0;
	265	while (len > 0) {
afc59400 BF	266	struct page p = (rqstp->rq_next_page++);
	267
	268	rqstp->rq_vec[v].iov_base = page_address(p);
3cc03b16 N	269	rqstp->rq_vec[v].iov_len = len < PAGE_SIZE?len:PAGE_SIZE;
3cc03b16 N	270	len -= rqstp->rq_vec[v].iov_len;
1da177e4 LT	271	v++;
	272	}
	273	args->vlen = v;
	274	return xdr_argsize_check(rqstp, p);
	275	}
	276
	277	int
131a21c2	278	nfssvc_decode_writeargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	279	struct nfsd_writeargs *args)
1da177e4 LT	280	{
f34b9568	281	unsigned int len, hdr, dlen;
1da177e4	282	int v;
f34b9568	283
1da177e4 LT	284	if (!(p = decode_fh(p, &args->fh)))
	285	return 0;
	286
	287	p++; /* beginoffset */
	288	args->offset = ntohl(p++); / offset */
	289	p++; /* totalcount */
	290	len = args->len = ntohl(*p++);
f34b9568 PS	291	/*
	292	* The protocol specifies a maximum of 8192 bytes.
	293	*/
7adae489	294	if (len > NFSSVC_MAXBLKSIZE_V2)
f34b9568 PS	295	return 0;
	296
	297	/*
	298	* Check to make sure that we got the right number of
	299	* bytes.
f34b9568 PS	300	*/
f34b9568 PS	301	hdr = (void*)p - rqstp->rq_arg.head[0].iov_base;
072f62ed N	302	dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len
	303	- hdr;
	304
f34b9568 PS	305	/*
	306	* Round the length of the data which was specified up to
	307	* the next multiple of XDR units and then compare that
	308	* against the length which was actually received.
ba67a39e N	309	* Note that when RPCSEC/GSS (for example) is used, the
	310	* data buffer can be padded so dlen might be larger
	311	* than required. It must never be smaller.
f34b9568	312	*/
ba67a39e	313	if (dlen < XDR_QUADLEN(len)*4)
f34b9568 PS	314	return 0;
	315
	316	rqstp->rq_vec[0].iov_base = (void*)p;
	317	rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
1da177e4	318	v = 0;
3cc03b16 N	319	while (len > rqstp->rq_vec[v].iov_len) {
3cc03b16 N	320	len -= rqstp->rq_vec[v].iov_len;
1da177e4	321	v++;
3cc03b16 N	322	rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
3cc03b16 N	323	rqstp->rq_vec[v].iov_len = PAGE_SIZE;
1da177e4	324	}
3cc03b16	325	rqstp->rq_vec[v].iov_len = len;
f34b9568 PS	326	args->vlen = v + 1;
f34b9568 PS	327	return 1;
1da177e4 LT	328	}
	329
	330	int
131a21c2	331	nfssvc_decode_createargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	332	struct nfsd_createargs *args)
1da177e4 LT	333	{
072f62ed N	334	if ( !(p = decode_fh(p, &args->fh))
072f62ed N	335	\|\| !(p = decode_filename(p, &args->name, &args->len)))
1da177e4	336	return 0;
072f62ed	337	p = decode_sattr(p, &args->attrs);
1da177e4 LT	338
	339	return xdr_argsize_check(rqstp, p);
	340	}
	341
	342	int
131a21c2	343	nfssvc_decode_renameargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	344	struct nfsd_renameargs *args)
	345	{
	346	if (!(p = decode_fh(p, &args->ffh))
	347	\|\| !(p = decode_filename(p, &args->fname, &args->flen))
	348	\|\| !(p = decode_fh(p, &args->tfh))
	349	\|\| !(p = decode_filename(p, &args->tname, &args->tlen)))
	350	return 0;
	351
	352	return xdr_argsize_check(rqstp, p);
	353	}
	354
	355	int
131a21c2	356	nfssvc_decode_readlinkargs(struct svc_rqst rqstp, __be32 p, struct nfsd_readlinkargs *args)
1da177e4 LT	357	{
	358	if (!(p = decode_fh(p, &args->fh)))
	359	return 0;
afc59400	360	args->buffer = page_address(*(rqstp->rq_next_page++));
1da177e4 LT	361
	362	return xdr_argsize_check(rqstp, p);
	363	}
	364
	365	int
131a21c2	366	nfssvc_decode_linkargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	367	struct nfsd_linkargs *args)
	368	{
	369	if (!(p = decode_fh(p, &args->ffh))
	370	\|\| !(p = decode_fh(p, &args->tfh))
	371	\|\| !(p = decode_filename(p, &args->tname, &args->tlen)))
	372	return 0;
	373
	374	return xdr_argsize_check(rqstp, p);
	375	}
	376
	377	int
131a21c2	378	nfssvc_decode_symlinkargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	379	struct nfsd_symlinkargs *args)
1da177e4 LT	380	{
072f62ed N	381	if ( !(p = decode_fh(p, &args->ffh))
	382	\|\| !(p = decode_filename(p, &args->fname, &args->flen))
	383	\|\| !(p = decode_pathname(p, &args->tname, &args->tlen)))
1da177e4	384	return 0;
072f62ed	385	p = decode_sattr(p, &args->attrs);
1da177e4 LT	386
	387	return xdr_argsize_check(rqstp, p);
	388	}
	389
	390	int
131a21c2	391	nfssvc_decode_readdirargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	392	struct nfsd_readdirargs *args)
	393	{
	394	if (!(p = decode_fh(p, &args->fh)))
	395	return 0;
	396	args->cookie = ntohl(*p++);
	397	args->count = ntohl(*p++);
	398	if (args->count > PAGE_SIZE)
	399	args->count = PAGE_SIZE;
	400
afc59400	401	args->buffer = page_address(*(rqstp->rq_next_page++));
1da177e4 LT	402
	403	return xdr_argsize_check(rqstp, p);
	404	}
	405
	406	/*
	407	* XDR encode functions
	408	*/
	409	int
131a21c2	410	nfssvc_encode_void(struct svc_rqst rqstp, __be32 p, void *dummy)
1da177e4 LT	411	{
	412	return xdr_ressize_check(rqstp, p);
	413	}
	414
	415	int
131a21c2	416	nfssvc_encode_attrstat(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	417	struct nfsd_attrstat *resp)
1da177e4 LT	418	{
a334de28	419	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
1da177e4 LT	420	return xdr_ressize_check(rqstp, p);
	421	}
	422
	423	int
131a21c2	424	nfssvc_encode_diropres(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	425	struct nfsd_diropres *resp)
	426	{
	427	p = encode_fh(p, &resp->fh);
a334de28	428	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
1da177e4 LT	429	return xdr_ressize_check(rqstp, p);
	430	}
	431
	432	int
131a21c2	433	nfssvc_encode_readlinkres(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	434	struct nfsd_readlinkres *resp)
	435	{
	436	*p++ = htonl(resp->len);
	437	xdr_ressize_check(rqstp, p);
	438	rqstp->rq_res.page_len = resp->len;
	439	if (resp->len & 3) {
	440	/* need to pad the tail */
1da177e4 LT	441	rqstp->rq_res.tail[0].iov_base = p;
	442	*p = 0;
	443	rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
	444	}
	445	return 1;
	446	}
	447
	448	int
131a21c2	449	nfssvc_encode_readres(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	450	struct nfsd_readres *resp)
1da177e4 LT	451	{
a334de28	452	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
1da177e4 LT	453	*p++ = htonl(resp->count);
	454	xdr_ressize_check(rqstp, p);
	455
25985edc	456	/* now update rqstp->rq_res to reflect data as well */
1da177e4 LT	457	rqstp->rq_res.page_len = resp->count;
	458	if (resp->count & 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->count&3);
	463	}
	464	return 1;
	465	}
	466
	467	int
131a21c2	468	nfssvc_encode_readdirres(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	469	struct nfsd_readdirres *resp)
	470	{
	471	xdr_ressize_check(rqstp, p);
	472	p = resp->buffer;
	473	p++ = 0; / no more entries */
	474	*p++ = htonl((resp->common.err == nfserr_eof));
	475	rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1;
	476
	477	return 1;
	478	}
	479
	480	int
131a21c2	481	nfssvc_encode_statfsres(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	482	struct nfsd_statfsres *resp)
	483	{
	484	struct kstatfs *stat = &resp->stats;
	485
7adae489	486	p++ = htonl(NFSSVC_MAXBLKSIZE_V2); / max transfer size */
1da177e4 LT	487	*p++ = htonl(stat->f_bsize);
	488	*p++ = htonl(stat->f_blocks);
	489	*p++ = htonl(stat->f_bfree);
	490	*p++ = htonl(stat->f_bavail);
	491	return xdr_ressize_check(rqstp, p);
	492	}
	493
	494	int
a0ad13ef N	495	nfssvc_encode_entry(void ccdv, const char name,
a0ad13ef N	496	int namlen, loff_t offset, u64 ino, unsigned int d_type)
1da177e4	497	{
a0ad13ef	498	struct readdir_cd *ccd = ccdv;
1da177e4	499	struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common);
131a21c2	500	__be32 *p = cd->buffer;
1da177e4 LT	501	int buflen, slen;
	502
	503	/*
	504	dprintk("nfsd: entry(%.*s off %ld ino %ld)\n",
	505	namlen, name, offset, ino);
	506	*/
	507
	508	if (offset > ~((u32) 0)) {
	509	cd->common.err = nfserr_fbig;
	510	return -EINVAL;
	511	}
	512	if (cd->offset)
	513	*cd->offset = htonl(offset);
	514	if (namlen > NFS2_MAXNAMLEN)
	515	namlen = NFS2_MAXNAMLEN;/* truncate filename */
	516
	517	slen = XDR_QUADLEN(namlen);
	518	if ((buflen = cd->buflen - slen - 4) < 0) {
	519	cd->common.err = nfserr_toosmall;
	520	return -EINVAL;
	521	}
40ee5dc6 PS	522	if (ino > ~((u32) 0)) {
	523	cd->common.err = nfserr_fbig;
	524	return -EINVAL;
	525	}
1da177e4 LT	526	p++ = xdr_one; / mark entry present */
	527	p++ = htonl((u32) ino); / file id */
	528	p = xdr_encode_array(p, name, namlen);/* name length & name */
	529	cd->offset = p; /* remember pointer */
131a21c2	530	p++ = htonl(~0U); / offset of next entry */
1da177e4 LT	531
	532	cd->buflen = buflen;
	533	cd->buffer = p;
	534	cd->common.err = nfs_ok;
	535	return 0;
	536	}
	537
	538	/*
	539	* XDR release functions
	540	*/
	541	int
131a21c2	542	nfssvc_release_fhandle(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	543	struct nfsd_fhandle *resp)
	544	{
	545	fh_put(&resp->fh);
	546	return 1;
	547	}