[net-next-2.6.git] / fs / nfsd / nfsxdr.c

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

#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_valid |= ATTR_UID;
		iap->ia_uid = tmp;
	}
	if ((tmp = ntohl(*p++)) != (u32)-1) {
		iap->ia_valid |= ATTR_GID;
		iap->ia_gid = tmp;
	}
	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) nfsd_ruid(rqstp, stat->uid));
	*p++ = htonl((u32) nfsd_rgid(rqstp, 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;
	vfs_getattr(fhp->fh_export->ex_path.mnt, fhp->fh_dentry, &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,pn;
	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) {
		pn = rqstp->rq_resused++;
		rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_respages[pn]);
		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_respages[rqstp->rq_resused++]);

	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_respages[rqstp->rq_resused++]);

	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 aswell */
	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
9a74af21	7	#include "xdr.h"
2e8138a2	8	#include "auth.h"
1da177e4 LT	9
	10	#define NFSDDBG_FACILITY NFSDDBG_XDR
	11
1da177e4 LT	12	/*
	13	* Mapping of S_IF* types to NFS file types
	14	*/
	15	static u32 nfs_ftypes[] = {
	16	NFNON, NFCHR, NFCHR, NFBAD,
	17	NFDIR, NFBAD, NFBLK, NFBAD,
	18	NFREG, NFBAD, NFLNK, NFBAD,
	19	NFSOCK, NFBAD, NFLNK, NFBAD,
	20	};
	21
	22
	23	/*
	24	* XDR functions for basic NFS types
	25	*/
131a21c2 AV	26	static __be32 *
131a21c2 AV	27	decode_fh(__be32 p, struct svc_fh fhp)
1da177e4 LT	28	{
	29	fh_init(fhp, NFS_FHSIZE);
	30	memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE);
	31	fhp->fh_handle.fh_size = NFS_FHSIZE;
	32
	33	/* FIXME: Look up export pointer here and verify
	34	* Sun Secure RPC if requested */
	35	return p + (NFS_FHSIZE >> 2);
	36	}
	37
a257cdd0	38	/* Helper function for NFSv2 ACL code */
131a21c2	39	__be32 nfs2svc_decode_fh(__be32 p, struct svc_fh *fhp)
a257cdd0 AG	40	{
	41	return decode_fh(p, fhp);
	42	}
	43
3ee6f61c	44	static __be32 *
131a21c2	45	encode_fh(__be32 p, struct svc_fh fhp)
1da177e4 LT	46	{
	47	memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE);
	48	return p + (NFS_FHSIZE>> 2);
	49	}
	50
	51	/*
	52	* Decode a file name and make sure that the path contains
	53	* no slashes or null bytes.
	54	*/
3ee6f61c	55	static __be32 *
ee1a95b3	56	decode_filename(__be32 p, char namp, unsigned int lenp)
1da177e4 LT	57	{
1da177e4 LT	58	char *name;
ee1a95b3	59	unsigned int i;
1da177e4 LT	60
	61	if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXNAMLEN)) != NULL) {
	62	for (i = 0, name = namp; i < lenp; i++, name++) {
	63	if (name == '\0' \|\| name == '/')
	64	return NULL;
	65	}
	66	}
	67
	68	return p;
	69	}
	70
3ee6f61c	71	static __be32 *
9c7544d3	72	decode_pathname(__be32 p, char namp, unsigned int lenp)
1da177e4 LT	73	{
1da177e4 LT	74	char *name;
9c7544d3	75	unsigned int i;
1da177e4 LT	76
	77	if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXPATHLEN)) != NULL) {
	78	for (i = 0, name = namp; i < lenp; i++, name++) {
	79	if (*name == '\0')
	80	return NULL;
	81	}
	82	}
	83
	84	return p;
	85	}
	86
3ee6f61c	87	static __be32 *
131a21c2	88	decode_sattr(__be32 p, struct iattr iap)
1da177e4 LT	89	{
	90	u32 tmp, tmp1;
	91
	92	iap->ia_valid = 0;
	93
	94	/* Sun client bug compatibility check: some sun clients seem to
	95	* put 0xffff in the mode field when they mean 0xffffffff.
	96	* Quoting the 4.4BSD nfs server code: Nah nah nah nah na nah.
	97	*/
	98	if ((tmp = ntohl(*p++)) != (u32)-1 && tmp != 0xffff) {
	99	iap->ia_valid \|= ATTR_MODE;
	100	iap->ia_mode = tmp;
	101	}
	102	if ((tmp = ntohl(*p++)) != (u32)-1) {
	103	iap->ia_valid \|= ATTR_UID;
	104	iap->ia_uid = tmp;
	105	}
	106	if ((tmp = ntohl(*p++)) != (u32)-1) {
	107	iap->ia_valid \|= ATTR_GID;
	108	iap->ia_gid = tmp;
	109	}
	110	if ((tmp = ntohl(*p++)) != (u32)-1) {
	111	iap->ia_valid \|= ATTR_SIZE;
	112	iap->ia_size = tmp;
	113	}
	114	tmp = ntohl(p++); tmp1 = ntohl(p++);
	115	if (tmp != (u32)-1 && tmp1 != (u32)-1) {
	116	iap->ia_valid \|= ATTR_ATIME \| ATTR_ATIME_SET;
	117	iap->ia_atime.tv_sec = tmp;
	118	iap->ia_atime.tv_nsec = tmp1 * 1000;
	119	}
	120	tmp = ntohl(p++); tmp1 = ntohl(p++);
	121	if (tmp != (u32)-1 && tmp1 != (u32)-1) {
	122	iap->ia_valid \|= ATTR_MTIME \| ATTR_MTIME_SET;
	123	iap->ia_mtime.tv_sec = tmp;
	124	iap->ia_mtime.tv_nsec = tmp1 * 1000;
	125	/*
	126	* Passing the invalid value useconds=1000000 for mtime
	127	* is a Sun convention for "set both mtime and atime to
	128	* current server time". It's needed to make permissions
	129	* checks for the "touch" program across v2 mounts to
	130	* Solaris and Irix boxes work correctly. See description of
	131	* sattr in section 6.1 of "NFS Illustrated" by
	132	* Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5
	133	*/
	134	if (tmp1 == 1000000)
	135	iap->ia_valid &= ~(ATTR_ATIME_SET\|ATTR_MTIME_SET);
	136	}
	137	return p;
	138	}
	139
131a21c2 AV	140	static __be32 *
131a21c2 AV	141	encode_fattr(struct svc_rqst rqstp, __be32 p, struct svc_fh *fhp,
a334de28	142	struct kstat *stat)
1da177e4	143	{
1da177e4	144	struct dentry *dentry = fhp->fh_dentry;
1da177e4 LT	145	int type;
1da177e4 LT	146	struct timespec time;
af6a4e28	147	u32 f;
1da177e4	148
a334de28	149	type = (stat->mode & S_IFMT);
1da177e4 LT	150
1da177e4 LT	151	*p++ = htonl(nfs_ftypes[type >> 12]);
a334de28 DS	152	*p++ = htonl((u32) stat->mode);
	153	*p++ = htonl((u32) stat->nlink);
	154	*p++ = htonl((u32) nfsd_ruid(rqstp, stat->uid));
	155	*p++ = htonl((u32) nfsd_rgid(rqstp, stat->gid));
1da177e4	156
a334de28	157	if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN) {
1da177e4 LT	158	*p++ = htonl(NFS_MAXPATHLEN);
1da177e4 LT	159	} else {
a334de28	160	*p++ = htonl((u32) stat->size);
1da177e4	161	}
a334de28	162	*p++ = htonl((u32) stat->blksize);
1da177e4	163	if (S_ISCHR(type) \|\| S_ISBLK(type))
a334de28	164	*p++ = htonl(new_encode_dev(stat->rdev));
1da177e4 LT	165	else
1da177e4 LT	166	*p++ = htonl(0xffffffff);
a334de28	167	*p++ = htonl((u32) stat->blocks);
af6a4e28 N	168	switch (fsid_source(fhp)) {
	169	default:
	170	case FSIDSOURCE_DEV:
a334de28	171	*p++ = htonl(new_encode_dev(stat->dev));
af6a4e28 N	172	break;
	173	case FSIDSOURCE_FSID:
	174	*p++ = htonl((u32) fhp->fh_export->ex_fsid);
	175	break;
	176	case FSIDSOURCE_UUID:
	177	f = ((u32*)fhp->fh_export->ex_uuid)[0];
	178	f ^= ((u32*)fhp->fh_export->ex_uuid)[1];
	179	f ^= ((u32*)fhp->fh_export->ex_uuid)[2];
	180	f ^= ((u32*)fhp->fh_export->ex_uuid)[3];
	181	*p++ = htonl(f);
	182	break;
	183	}
a334de28 DS	184	*p++ = htonl((u32) stat->ino);
	185	*p++ = htonl((u32) stat->atime.tv_sec);
	186	*p++ = htonl(stat->atime.tv_nsec ? stat->atime.tv_nsec / 1000 : 0);
1da177e4 LT	187	lease_get_mtime(dentry->d_inode, &time);
	188	*p++ = htonl((u32) time.tv_sec);
	189	*p++ = htonl(time.tv_nsec ? time.tv_nsec / 1000 : 0);
a334de28 DS	190	*p++ = htonl((u32) stat->ctime.tv_sec);
a334de28 DS	191	*p++ = htonl(stat->ctime.tv_nsec ? stat->ctime.tv_nsec / 1000 : 0);
1da177e4 LT	192
	193	return p;
	194	}
	195
a257cdd0	196	/* Helper function for NFSv2 ACL code */
131a21c2	197	__be32 nfs2svc_encode_fattr(struct svc_rqst rqstp, __be32 p, struct svc_fh fhp)
a257cdd0	198	{
a334de28	199	struct kstat stat;
54775491	200	vfs_getattr(fhp->fh_export->ex_path.mnt, fhp->fh_dentry, &stat);
a334de28	201	return encode_fattr(rqstp, p, fhp, &stat);
a257cdd0	202	}
1da177e4 LT	203
	204	/*
	205	* XDR decode functions
	206	*/
	207	int
131a21c2	208	nfssvc_decode_void(struct svc_rqst rqstp, __be32 p, void *dummy)
1da177e4 LT	209	{
	210	return xdr_argsize_check(rqstp, p);
	211	}
	212
	213	int
131a21c2	214	nfssvc_decode_fhandle(struct svc_rqst rqstp, __be32 p, struct nfsd_fhandle *args)
1da177e4 LT	215	{
	216	if (!(p = decode_fh(p, &args->fh)))
	217	return 0;
	218	return xdr_argsize_check(rqstp, p);
	219	}
	220
	221	int
131a21c2	222	nfssvc_decode_sattrargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	223	struct nfsd_sattrargs *args)
1da177e4 LT	224	{
072f62ed N	225	p = decode_fh(p, &args->fh);
072f62ed N	226	if (!p)
1da177e4	227	return 0;
072f62ed	228	p = decode_sattr(p, &args->attrs);
1da177e4 LT	229
	230	return xdr_argsize_check(rqstp, p);
	231	}
	232
	233	int
131a21c2	234	nfssvc_decode_diropargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	235	struct nfsd_diropargs *args)
	236	{
	237	if (!(p = decode_fh(p, &args->fh))
	238	\|\| !(p = decode_filename(p, &args->name, &args->len)))
	239	return 0;
	240
	241	return xdr_argsize_check(rqstp, p);
	242	}
	243
	244	int
131a21c2	245	nfssvc_decode_readargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	246	struct nfsd_readargs *args)
	247	{
	248	unsigned int len;
	249	int v,pn;
	250	if (!(p = decode_fh(p, &args->fh)))
	251	return 0;
	252
	253	args->offset = ntohl(*p++);
	254	len = args->count = ntohl(*p++);
	255	p++; /* totalcount - unused */
	256
7adae489 GB	257	if (len > NFSSVC_MAXBLKSIZE_V2)
7adae489 GB	258	len = NFSSVC_MAXBLKSIZE_V2;
1da177e4 LT	259
	260	/* set up somewhere to store response.
	261	* We take pages, put them on reslist and include in iovec
	262	*/
	263	v=0;
	264	while (len > 0) {
44524359	265	pn = rqstp->rq_resused++;
3cc03b16 N	266	rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_respages[pn]);
	267	rqstp->rq_vec[v].iov_len = len < PAGE_SIZE?len:PAGE_SIZE;
	268	len -= rqstp->rq_vec[v].iov_len;
1da177e4 LT	269	v++;
	270	}
	271	args->vlen = v;
	272	return xdr_argsize_check(rqstp, p);
	273	}
	274
	275	int
131a21c2	276	nfssvc_decode_writeargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	277	struct nfsd_writeargs *args)
1da177e4 LT	278	{
f34b9568	279	unsigned int len, hdr, dlen;
1da177e4	280	int v;
f34b9568	281
1da177e4 LT	282	if (!(p = decode_fh(p, &args->fh)))
	283	return 0;
	284
	285	p++; /* beginoffset */
	286	args->offset = ntohl(p++); / offset */
	287	p++; /* totalcount */
	288	len = args->len = ntohl(*p++);
f34b9568 PS	289	/*
	290	* The protocol specifies a maximum of 8192 bytes.
	291	*/
7adae489	292	if (len > NFSSVC_MAXBLKSIZE_V2)
f34b9568 PS	293	return 0;
	294
	295	/*
	296	* Check to make sure that we got the right number of
	297	* bytes.
f34b9568 PS	298	*/
f34b9568 PS	299	hdr = (void*)p - rqstp->rq_arg.head[0].iov_base;
072f62ed N	300	dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len
	301	- hdr;
	302
f34b9568 PS	303	/*
	304	* Round the length of the data which was specified up to
	305	* the next multiple of XDR units and then compare that
	306	* against the length which was actually received.
ba67a39e N	307	* Note that when RPCSEC/GSS (for example) is used, the
	308	* data buffer can be padded so dlen might be larger
	309	* than required. It must never be smaller.
f34b9568	310	*/
ba67a39e	311	if (dlen < XDR_QUADLEN(len)*4)
f34b9568 PS	312	return 0;
	313
	314	rqstp->rq_vec[0].iov_base = (void*)p;
	315	rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
1da177e4	316	v = 0;
3cc03b16 N	317	while (len > rqstp->rq_vec[v].iov_len) {
3cc03b16 N	318	len -= rqstp->rq_vec[v].iov_len;
1da177e4	319	v++;
3cc03b16 N	320	rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
3cc03b16 N	321	rqstp->rq_vec[v].iov_len = PAGE_SIZE;
1da177e4	322	}
3cc03b16	323	rqstp->rq_vec[v].iov_len = len;
f34b9568 PS	324	args->vlen = v + 1;
f34b9568 PS	325	return 1;
1da177e4 LT	326	}
	327
	328	int
131a21c2	329	nfssvc_decode_createargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	330	struct nfsd_createargs *args)
1da177e4 LT	331	{
072f62ed N	332	if ( !(p = decode_fh(p, &args->fh))
072f62ed N	333	\|\| !(p = decode_filename(p, &args->name, &args->len)))
1da177e4	334	return 0;
072f62ed	335	p = decode_sattr(p, &args->attrs);
1da177e4 LT	336
	337	return xdr_argsize_check(rqstp, p);
	338	}
	339
	340	int
131a21c2	341	nfssvc_decode_renameargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	342	struct nfsd_renameargs *args)
	343	{
	344	if (!(p = decode_fh(p, &args->ffh))
	345	\|\| !(p = decode_filename(p, &args->fname, &args->flen))
	346	\|\| !(p = decode_fh(p, &args->tfh))
	347	\|\| !(p = decode_filename(p, &args->tname, &args->tlen)))
	348	return 0;
	349
	350	return xdr_argsize_check(rqstp, p);
	351	}
	352
	353	int
131a21c2	354	nfssvc_decode_readlinkargs(struct svc_rqst rqstp, __be32 p, struct nfsd_readlinkargs *args)
1da177e4 LT	355	{
	356	if (!(p = decode_fh(p, &args->fh)))
	357	return 0;
44524359	358	args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused++]);
1da177e4 LT	359
	360	return xdr_argsize_check(rqstp, p);
	361	}
	362
	363	int
131a21c2	364	nfssvc_decode_linkargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	365	struct nfsd_linkargs *args)
	366	{
	367	if (!(p = decode_fh(p, &args->ffh))
	368	\|\| !(p = decode_fh(p, &args->tfh))
	369	\|\| !(p = decode_filename(p, &args->tname, &args->tlen)))
	370	return 0;
	371
	372	return xdr_argsize_check(rqstp, p);
	373	}
	374
	375	int
131a21c2	376	nfssvc_decode_symlinkargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	377	struct nfsd_symlinkargs *args)
1da177e4 LT	378	{
072f62ed N	379	if ( !(p = decode_fh(p, &args->ffh))
	380	\|\| !(p = decode_filename(p, &args->fname, &args->flen))
	381	\|\| !(p = decode_pathname(p, &args->tname, &args->tlen)))
1da177e4	382	return 0;
072f62ed	383	p = decode_sattr(p, &args->attrs);
1da177e4 LT	384
	385	return xdr_argsize_check(rqstp, p);
	386	}
	387
	388	int
131a21c2	389	nfssvc_decode_readdirargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	390	struct nfsd_readdirargs *args)
	391	{
	392	if (!(p = decode_fh(p, &args->fh)))
	393	return 0;
	394	args->cookie = ntohl(*p++);
	395	args->count = ntohl(*p++);
	396	if (args->count > PAGE_SIZE)
	397	args->count = PAGE_SIZE;
	398
44524359	399	args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused++]);
1da177e4 LT	400
	401	return xdr_argsize_check(rqstp, p);
	402	}
	403
	404	/*
	405	* XDR encode functions
	406	*/
	407	int
131a21c2	408	nfssvc_encode_void(struct svc_rqst rqstp, __be32 p, void *dummy)
1da177e4 LT	409	{
	410	return xdr_ressize_check(rqstp, p);
	411	}
	412
	413	int
131a21c2	414	nfssvc_encode_attrstat(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	415	struct nfsd_attrstat *resp)
1da177e4 LT	416	{
a334de28	417	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
1da177e4 LT	418	return xdr_ressize_check(rqstp, p);
	419	}
	420
	421	int
131a21c2	422	nfssvc_encode_diropres(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	423	struct nfsd_diropres *resp)
	424	{
	425	p = encode_fh(p, &resp->fh);
a334de28	426	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
1da177e4 LT	427	return xdr_ressize_check(rqstp, p);
	428	}
	429
	430	int
131a21c2	431	nfssvc_encode_readlinkres(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	432	struct nfsd_readlinkres *resp)
	433	{
	434	*p++ = htonl(resp->len);
	435	xdr_ressize_check(rqstp, p);
	436	rqstp->rq_res.page_len = resp->len;
	437	if (resp->len & 3) {
	438	/* need to pad the tail */
1da177e4 LT	439	rqstp->rq_res.tail[0].iov_base = p;
	440	*p = 0;
	441	rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
	442	}
	443	return 1;
	444	}
	445
	446	int
131a21c2	447	nfssvc_encode_readres(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	448	struct nfsd_readres *resp)
1da177e4 LT	449	{
a334de28	450	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
1da177e4 LT	451	*p++ = htonl(resp->count);
	452	xdr_ressize_check(rqstp, p);
	453
	454	/* now update rqstp->rq_res to reflect data aswell */
	455	rqstp->rq_res.page_len = resp->count;
	456	if (resp->count & 3) {
	457	/* need to pad the tail */
1da177e4 LT	458	rqstp->rq_res.tail[0].iov_base = p;
	459	*p = 0;
	460	rqstp->rq_res.tail[0].iov_len = 4 - (resp->count&3);
	461	}
	462	return 1;
	463	}
	464
	465	int
131a21c2	466	nfssvc_encode_readdirres(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	467	struct nfsd_readdirres *resp)
	468	{
	469	xdr_ressize_check(rqstp, p);
	470	p = resp->buffer;
	471	p++ = 0; / no more entries */
	472	*p++ = htonl((resp->common.err == nfserr_eof));
	473	rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1;
	474
	475	return 1;
	476	}
	477
	478	int
131a21c2	479	nfssvc_encode_statfsres(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	480	struct nfsd_statfsres *resp)
	481	{
	482	struct kstatfs *stat = &resp->stats;
	483
7adae489	484	p++ = htonl(NFSSVC_MAXBLKSIZE_V2); / max transfer size */
1da177e4 LT	485	*p++ = htonl(stat->f_bsize);
	486	*p++ = htonl(stat->f_blocks);
	487	*p++ = htonl(stat->f_bfree);
	488	*p++ = htonl(stat->f_bavail);
	489	return xdr_ressize_check(rqstp, p);
	490	}
	491
	492	int
a0ad13ef N	493	nfssvc_encode_entry(void ccdv, const char name,
a0ad13ef N	494	int namlen, loff_t offset, u64 ino, unsigned int d_type)
1da177e4	495	{
a0ad13ef	496	struct readdir_cd *ccd = ccdv;
1da177e4	497	struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common);
131a21c2	498	__be32 *p = cd->buffer;
1da177e4 LT	499	int buflen, slen;
	500
	501	/*
	502	dprintk("nfsd: entry(%.*s off %ld ino %ld)\n",
	503	namlen, name, offset, ino);
	504	*/
	505
	506	if (offset > ~((u32) 0)) {
	507	cd->common.err = nfserr_fbig;
	508	return -EINVAL;
	509	}
	510	if (cd->offset)
	511	*cd->offset = htonl(offset);
	512	if (namlen > NFS2_MAXNAMLEN)
	513	namlen = NFS2_MAXNAMLEN;/* truncate filename */
	514
	515	slen = XDR_QUADLEN(namlen);
	516	if ((buflen = cd->buflen - slen - 4) < 0) {
	517	cd->common.err = nfserr_toosmall;
	518	return -EINVAL;
	519	}
40ee5dc6 PS	520	if (ino > ~((u32) 0)) {
	521	cd->common.err = nfserr_fbig;
	522	return -EINVAL;
	523	}
1da177e4 LT	524	p++ = xdr_one; / mark entry present */
	525	p++ = htonl((u32) ino); / file id */
	526	p = xdr_encode_array(p, name, namlen);/* name length & name */
	527	cd->offset = p; /* remember pointer */
131a21c2	528	p++ = htonl(~0U); / offset of next entry */
1da177e4 LT	529
	530	cd->buflen = buflen;
	531	cd->buffer = p;
	532	cd->common.err = nfs_ok;
	533	return 0;
	534	}
	535
	536	/*
	537	* XDR release functions
	538	*/
	539	int
131a21c2	540	nfssvc_release_fhandle(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	541	struct nfsd_fhandle *resp)
	542	{
	543	fh_put(&resp->fh);
	544	return 1;
	545	}