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

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

#include <linux/types.h>
#include <linux/time.h>
#include <linux/nfs.h>
#include <linux/vfs.h>
#include <linux/sunrpc/xdr.h>
#include <linux/sunrpc/svc.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/xdr.h>
#include <linux/mm.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, int *lenp)
{
	char		*name;
	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, int *lenp)
{
	char		*name;
	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_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	/*
f30c2269	2	* linux/fs/nfsd/nfsxdr.c
1da177e4 LT	3	*
	4	* XDR support for nfsd
	5	*
	6	* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
	7	*/
	8
	9	#include <linux/types.h>
	10	#include <linux/time.h>
	11	#include <linux/nfs.h>
	12	#include <linux/vfs.h>
	13	#include <linux/sunrpc/xdr.h>
	14	#include <linux/sunrpc/svc.h>
	15	#include <linux/nfsd/nfsd.h>
	16	#include <linux/nfsd/xdr.h>
	17	#include <linux/mm.h>
	18
	19	#define NFSDDBG_FACILITY NFSDDBG_XDR
	20
1da177e4 LT	21	/*
	22	* Mapping of S_IF* types to NFS file types
	23	*/
	24	static u32 nfs_ftypes[] = {
	25	NFNON, NFCHR, NFCHR, NFBAD,
	26	NFDIR, NFBAD, NFBLK, NFBAD,
	27	NFREG, NFBAD, NFLNK, NFBAD,
	28	NFSOCK, NFBAD, NFLNK, NFBAD,
	29	};
	30
	31
	32	/*
	33	* XDR functions for basic NFS types
	34	*/
131a21c2 AV	35	static __be32 *
131a21c2 AV	36	decode_fh(__be32 p, struct svc_fh fhp)
1da177e4 LT	37	{
	38	fh_init(fhp, NFS_FHSIZE);
	39	memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE);
	40	fhp->fh_handle.fh_size = NFS_FHSIZE;
	41
	42	/* FIXME: Look up export pointer here and verify
	43	* Sun Secure RPC if requested */
	44	return p + (NFS_FHSIZE >> 2);
	45	}
	46
a257cdd0	47	/* Helper function for NFSv2 ACL code */
131a21c2	48	__be32 nfs2svc_decode_fh(__be32 p, struct svc_fh *fhp)
a257cdd0 AG	49	{
	50	return decode_fh(p, fhp);
	51	}
	52
3ee6f61c	53	static __be32 *
131a21c2	54	encode_fh(__be32 p, struct svc_fh fhp)
1da177e4 LT	55	{
	56	memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE);
	57	return p + (NFS_FHSIZE>> 2);
	58	}
	59
	60	/*
	61	* Decode a file name and make sure that the path contains
	62	* no slashes or null bytes.
	63	*/
3ee6f61c	64	static __be32 *
131a21c2	65	decode_filename(__be32 p, char namp, int lenp)
1da177e4 LT	66	{
	67	char *name;
	68	int i;
	69
	70	if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXNAMLEN)) != NULL) {
	71	for (i = 0, name = namp; i < lenp; i++, name++) {
	72	if (name == '\0' \|\| name == '/')
	73	return NULL;
	74	}
	75	}
	76
	77	return p;
	78	}
	79
3ee6f61c	80	static __be32 *
131a21c2	81	decode_pathname(__be32 p, char namp, int lenp)
1da177e4 LT	82	{
	83	char *name;
	84	int i;
	85
	86	if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXPATHLEN)) != NULL) {
	87	for (i = 0, name = namp; i < lenp; i++, name++) {
	88	if (*name == '\0')
	89	return NULL;
	90	}
	91	}
	92
	93	return p;
	94	}
	95
3ee6f61c	96	static __be32 *
131a21c2	97	decode_sattr(__be32 p, struct iattr iap)
1da177e4 LT	98	{
	99	u32 tmp, tmp1;
	100
	101	iap->ia_valid = 0;
	102
	103	/* Sun client bug compatibility check: some sun clients seem to
	104	* put 0xffff in the mode field when they mean 0xffffffff.
	105	* Quoting the 4.4BSD nfs server code: Nah nah nah nah na nah.
	106	*/
	107	if ((tmp = ntohl(*p++)) != (u32)-1 && tmp != 0xffff) {
	108	iap->ia_valid \|= ATTR_MODE;
	109	iap->ia_mode = tmp;
	110	}
	111	if ((tmp = ntohl(*p++)) != (u32)-1) {
	112	iap->ia_valid \|= ATTR_UID;
	113	iap->ia_uid = tmp;
	114	}
	115	if ((tmp = ntohl(*p++)) != (u32)-1) {
	116	iap->ia_valid \|= ATTR_GID;
	117	iap->ia_gid = tmp;
	118	}
	119	if ((tmp = ntohl(*p++)) != (u32)-1) {
	120	iap->ia_valid \|= ATTR_SIZE;
	121	iap->ia_size = tmp;
	122	}
	123	tmp = ntohl(p++); tmp1 = ntohl(p++);
	124	if (tmp != (u32)-1 && tmp1 != (u32)-1) {
	125	iap->ia_valid \|= ATTR_ATIME \| ATTR_ATIME_SET;
	126	iap->ia_atime.tv_sec = tmp;
	127	iap->ia_atime.tv_nsec = tmp1 * 1000;
	128	}
	129	tmp = ntohl(p++); tmp1 = ntohl(p++);
	130	if (tmp != (u32)-1 && tmp1 != (u32)-1) {
	131	iap->ia_valid \|= ATTR_MTIME \| ATTR_MTIME_SET;
	132	iap->ia_mtime.tv_sec = tmp;
	133	iap->ia_mtime.tv_nsec = tmp1 * 1000;
	134	/*
	135	* Passing the invalid value useconds=1000000 for mtime
	136	* is a Sun convention for "set both mtime and atime to
	137	* current server time". It's needed to make permissions
	138	* checks for the "touch" program across v2 mounts to
	139	* Solaris and Irix boxes work correctly. See description of
	140	* sattr in section 6.1 of "NFS Illustrated" by
	141	* Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5
	142	*/
	143	if (tmp1 == 1000000)
	144	iap->ia_valid &= ~(ATTR_ATIME_SET\|ATTR_MTIME_SET);
	145	}
	146	return p;
	147	}
	148
131a21c2 AV	149	static __be32 *
131a21c2 AV	150	encode_fattr(struct svc_rqst rqstp, __be32 p, struct svc_fh *fhp,
a334de28	151	struct kstat *stat)
1da177e4	152	{
1da177e4	153	struct dentry *dentry = fhp->fh_dentry;
1da177e4 LT	154	int type;
1da177e4 LT	155	struct timespec time;
af6a4e28	156	u32 f;
1da177e4	157
a334de28	158	type = (stat->mode & S_IFMT);
1da177e4 LT	159
1da177e4 LT	160	*p++ = htonl(nfs_ftypes[type >> 12]);
a334de28 DS	161	*p++ = htonl((u32) stat->mode);
	162	*p++ = htonl((u32) stat->nlink);
	163	*p++ = htonl((u32) nfsd_ruid(rqstp, stat->uid));
	164	*p++ = htonl((u32) nfsd_rgid(rqstp, stat->gid));
1da177e4	165
a334de28	166	if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN) {
1da177e4 LT	167	*p++ = htonl(NFS_MAXPATHLEN);
1da177e4 LT	168	} else {
a334de28	169	*p++ = htonl((u32) stat->size);
1da177e4	170	}
a334de28	171	*p++ = htonl((u32) stat->blksize);
1da177e4	172	if (S_ISCHR(type) \|\| S_ISBLK(type))
a334de28	173	*p++ = htonl(new_encode_dev(stat->rdev));
1da177e4 LT	174	else
1da177e4 LT	175	*p++ = htonl(0xffffffff);
a334de28	176	*p++ = htonl((u32) stat->blocks);
af6a4e28 N	177	switch (fsid_source(fhp)) {
	178	default:
	179	case FSIDSOURCE_DEV:
a334de28	180	*p++ = htonl(new_encode_dev(stat->dev));
af6a4e28 N	181	break;
	182	case FSIDSOURCE_FSID:
	183	*p++ = htonl((u32) fhp->fh_export->ex_fsid);
	184	break;
	185	case FSIDSOURCE_UUID:
	186	f = ((u32*)fhp->fh_export->ex_uuid)[0];
	187	f ^= ((u32*)fhp->fh_export->ex_uuid)[1];
	188	f ^= ((u32*)fhp->fh_export->ex_uuid)[2];
	189	f ^= ((u32*)fhp->fh_export->ex_uuid)[3];
	190	*p++ = htonl(f);
	191	break;
	192	}
a334de28 DS	193	*p++ = htonl((u32) stat->ino);
	194	*p++ = htonl((u32) stat->atime.tv_sec);
	195	*p++ = htonl(stat->atime.tv_nsec ? stat->atime.tv_nsec / 1000 : 0);
1da177e4 LT	196	lease_get_mtime(dentry->d_inode, &time);
	197	*p++ = htonl((u32) time.tv_sec);
	198	*p++ = htonl(time.tv_nsec ? time.tv_nsec / 1000 : 0);
a334de28 DS	199	*p++ = htonl((u32) stat->ctime.tv_sec);
a334de28 DS	200	*p++ = htonl(stat->ctime.tv_nsec ? stat->ctime.tv_nsec / 1000 : 0);
1da177e4 LT	201
	202	return p;
	203	}
	204
a257cdd0	205	/* Helper function for NFSv2 ACL code */
131a21c2	206	__be32 nfs2svc_encode_fattr(struct svc_rqst rqstp, __be32 p, struct svc_fh fhp)
a257cdd0	207	{
a334de28 DS	208	struct kstat stat;
	209	vfs_getattr(fhp->fh_export->ex_mnt, fhp->fh_dentry, &stat);
	210	return encode_fattr(rqstp, p, fhp, &stat);
a257cdd0	211	}
1da177e4 LT	212
	213	/*
	214	* XDR decode functions
	215	*/
	216	int
131a21c2	217	nfssvc_decode_void(struct svc_rqst rqstp, __be32 p, void *dummy)
1da177e4 LT	218	{
	219	return xdr_argsize_check(rqstp, p);
	220	}
	221
	222	int
131a21c2	223	nfssvc_decode_fhandle(struct svc_rqst rqstp, __be32 p, struct nfsd_fhandle *args)
1da177e4 LT	224	{
	225	if (!(p = decode_fh(p, &args->fh)))
	226	return 0;
	227	return xdr_argsize_check(rqstp, p);
	228	}
	229
	230	int
131a21c2	231	nfssvc_decode_sattrargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	232	struct nfsd_sattrargs *args)
1da177e4 LT	233	{
072f62ed N	234	p = decode_fh(p, &args->fh);
072f62ed N	235	if (!p)
1da177e4	236	return 0;
072f62ed	237	p = decode_sattr(p, &args->attrs);
1da177e4 LT	238
	239	return xdr_argsize_check(rqstp, p);
	240	}
	241
	242	int
131a21c2	243	nfssvc_decode_diropargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	244	struct nfsd_diropargs *args)
	245	{
	246	if (!(p = decode_fh(p, &args->fh))
	247	\|\| !(p = decode_filename(p, &args->name, &args->len)))
	248	return 0;
	249
	250	return xdr_argsize_check(rqstp, p);
	251	}
	252
	253	int
131a21c2	254	nfssvc_decode_readargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	255	struct nfsd_readargs *args)
	256	{
	257	unsigned int len;
	258	int v,pn;
	259	if (!(p = decode_fh(p, &args->fh)))
	260	return 0;
	261
	262	args->offset = ntohl(*p++);
	263	len = args->count = ntohl(*p++);
	264	p++; /* totalcount - unused */
	265
7adae489 GB	266	if (len > NFSSVC_MAXBLKSIZE_V2)
7adae489 GB	267	len = NFSSVC_MAXBLKSIZE_V2;
1da177e4 LT	268
	269	/* set up somewhere to store response.
	270	* We take pages, put them on reslist and include in iovec
	271	*/
	272	v=0;
	273	while (len > 0) {
44524359	274	pn = rqstp->rq_resused++;
3cc03b16 N	275	rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_respages[pn]);
	276	rqstp->rq_vec[v].iov_len = len < PAGE_SIZE?len:PAGE_SIZE;
	277	len -= rqstp->rq_vec[v].iov_len;
1da177e4 LT	278	v++;
	279	}
	280	args->vlen = v;
	281	return xdr_argsize_check(rqstp, p);
	282	}
	283
	284	int
131a21c2	285	nfssvc_decode_writeargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	286	struct nfsd_writeargs *args)
1da177e4 LT	287	{
f34b9568	288	unsigned int len, hdr, dlen;
1da177e4	289	int v;
f34b9568	290
1da177e4 LT	291	if (!(p = decode_fh(p, &args->fh)))
	292	return 0;
	293
	294	p++; /* beginoffset */
	295	args->offset = ntohl(p++); / offset */
	296	p++; /* totalcount */
	297	len = args->len = ntohl(*p++);
f34b9568 PS	298	/*
	299	* The protocol specifies a maximum of 8192 bytes.
	300	*/
7adae489	301	if (len > NFSSVC_MAXBLKSIZE_V2)
f34b9568 PS	302	return 0;
	303
	304	/*
	305	* Check to make sure that we got the right number of
	306	* bytes.
f34b9568 PS	307	*/
f34b9568 PS	308	hdr = (void*)p - rqstp->rq_arg.head[0].iov_base;
072f62ed N	309	dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len
	310	- hdr;
	311
f34b9568 PS	312	/*
	313	* Round the length of the data which was specified up to
	314	* the next multiple of XDR units and then compare that
	315	* against the length which was actually received.
ba67a39e N	316	* Note that when RPCSEC/GSS (for example) is used, the
	317	* data buffer can be padded so dlen might be larger
	318	* than required. It must never be smaller.
f34b9568	319	*/
ba67a39e	320	if (dlen < XDR_QUADLEN(len)*4)
f34b9568 PS	321	return 0;
	322
	323	rqstp->rq_vec[0].iov_base = (void*)p;
	324	rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
1da177e4	325	v = 0;
3cc03b16 N	326	while (len > rqstp->rq_vec[v].iov_len) {
3cc03b16 N	327	len -= rqstp->rq_vec[v].iov_len;
1da177e4	328	v++;
3cc03b16 N	329	rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
3cc03b16 N	330	rqstp->rq_vec[v].iov_len = PAGE_SIZE;
1da177e4	331	}
3cc03b16	332	rqstp->rq_vec[v].iov_len = len;
f34b9568 PS	333	args->vlen = v + 1;
f34b9568 PS	334	return 1;
1da177e4 LT	335	}
	336
	337	int
131a21c2	338	nfssvc_decode_createargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	339	struct nfsd_createargs *args)
1da177e4 LT	340	{
072f62ed N	341	if ( !(p = decode_fh(p, &args->fh))
072f62ed N	342	\|\| !(p = decode_filename(p, &args->name, &args->len)))
1da177e4	343	return 0;
072f62ed	344	p = decode_sattr(p, &args->attrs);
1da177e4 LT	345
	346	return xdr_argsize_check(rqstp, p);
	347	}
	348
	349	int
131a21c2	350	nfssvc_decode_renameargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	351	struct nfsd_renameargs *args)
	352	{
	353	if (!(p = decode_fh(p, &args->ffh))
	354	\|\| !(p = decode_filename(p, &args->fname, &args->flen))
	355	\|\| !(p = decode_fh(p, &args->tfh))
	356	\|\| !(p = decode_filename(p, &args->tname, &args->tlen)))
	357	return 0;
	358
	359	return xdr_argsize_check(rqstp, p);
	360	}
	361
	362	int
131a21c2	363	nfssvc_decode_readlinkargs(struct svc_rqst rqstp, __be32 p, struct nfsd_readlinkargs *args)
1da177e4 LT	364	{
	365	if (!(p = decode_fh(p, &args->fh)))
	366	return 0;
44524359	367	args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused++]);
1da177e4 LT	368
	369	return xdr_argsize_check(rqstp, p);
	370	}
	371
	372	int
131a21c2	373	nfssvc_decode_linkargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	374	struct nfsd_linkargs *args)
	375	{
	376	if (!(p = decode_fh(p, &args->ffh))
	377	\|\| !(p = decode_fh(p, &args->tfh))
	378	\|\| !(p = decode_filename(p, &args->tname, &args->tlen)))
	379	return 0;
	380
	381	return xdr_argsize_check(rqstp, p);
	382	}
	383
	384	int
131a21c2	385	nfssvc_decode_symlinkargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	386	struct nfsd_symlinkargs *args)
1da177e4 LT	387	{
072f62ed N	388	if ( !(p = decode_fh(p, &args->ffh))
	389	\|\| !(p = decode_filename(p, &args->fname, &args->flen))
	390	\|\| !(p = decode_pathname(p, &args->tname, &args->tlen)))
1da177e4	391	return 0;
072f62ed	392	p = decode_sattr(p, &args->attrs);
1da177e4 LT	393
	394	return xdr_argsize_check(rqstp, p);
	395	}
	396
	397	int
131a21c2	398	nfssvc_decode_readdirargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	399	struct nfsd_readdirargs *args)
	400	{
	401	if (!(p = decode_fh(p, &args->fh)))
	402	return 0;
	403	args->cookie = ntohl(*p++);
	404	args->count = ntohl(*p++);
	405	if (args->count > PAGE_SIZE)
	406	args->count = PAGE_SIZE;
	407
44524359	408	args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused++]);
1da177e4 LT	409
	410	return xdr_argsize_check(rqstp, p);
	411	}
	412
	413	/*
	414	* XDR encode functions
	415	*/
	416	int
131a21c2	417	nfssvc_encode_void(struct svc_rqst rqstp, __be32 p, void *dummy)
1da177e4 LT	418	{
	419	return xdr_ressize_check(rqstp, p);
	420	}
	421
	422	int
131a21c2	423	nfssvc_encode_attrstat(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	424	struct nfsd_attrstat *resp)
1da177e4 LT	425	{
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_diropres(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	432	struct nfsd_diropres *resp)
	433	{
	434	p = encode_fh(p, &resp->fh);
a334de28	435	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
1da177e4 LT	436	return xdr_ressize_check(rqstp, p);
	437	}
	438
	439	int
131a21c2	440	nfssvc_encode_readlinkres(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	441	struct nfsd_readlinkres *resp)
	442	{
	443	*p++ = htonl(resp->len);
	444	xdr_ressize_check(rqstp, p);
	445	rqstp->rq_res.page_len = resp->len;
	446	if (resp->len & 3) {
	447	/* need to pad the tail */
1da177e4 LT	448	rqstp->rq_res.tail[0].iov_base = p;
	449	*p = 0;
	450	rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
	451	}
	452	return 1;
	453	}
	454
	455	int
131a21c2	456	nfssvc_encode_readres(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	457	struct nfsd_readres *resp)
1da177e4 LT	458	{
a334de28	459	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
1da177e4 LT	460	*p++ = htonl(resp->count);
	461	xdr_ressize_check(rqstp, p);
	462
	463	/* now update rqstp->rq_res to reflect data aswell */
	464	rqstp->rq_res.page_len = resp->count;
	465	if (resp->count & 3) {
	466	/* need to pad the tail */
1da177e4 LT	467	rqstp->rq_res.tail[0].iov_base = p;
	468	*p = 0;
	469	rqstp->rq_res.tail[0].iov_len = 4 - (resp->count&3);
	470	}
	471	return 1;
	472	}
	473
	474	int
131a21c2	475	nfssvc_encode_readdirres(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	476	struct nfsd_readdirres *resp)
	477	{
	478	xdr_ressize_check(rqstp, p);
	479	p = resp->buffer;
	480	p++ = 0; / no more entries */
	481	*p++ = htonl((resp->common.err == nfserr_eof));
	482	rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1;
	483
	484	return 1;
	485	}
	486
	487	int
131a21c2	488	nfssvc_encode_statfsres(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	489	struct nfsd_statfsres *resp)
	490	{
	491	struct kstatfs *stat = &resp->stats;
	492
7adae489	493	p++ = htonl(NFSSVC_MAXBLKSIZE_V2); / max transfer size */
1da177e4 LT	494	*p++ = htonl(stat->f_bsize);
	495	*p++ = htonl(stat->f_blocks);
	496	*p++ = htonl(stat->f_bfree);
	497	*p++ = htonl(stat->f_bavail);
	498	return xdr_ressize_check(rqstp, p);
	499	}
	500
	501	int
a0ad13ef N	502	nfssvc_encode_entry(void ccdv, const char name,
a0ad13ef N	503	int namlen, loff_t offset, u64 ino, unsigned int d_type)
1da177e4	504	{
a0ad13ef	505	struct readdir_cd *ccd = ccdv;
1da177e4	506	struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common);
131a21c2	507	__be32 *p = cd->buffer;
1da177e4 LT	508	int buflen, slen;
	509
	510	/*
	511	dprintk("nfsd: entry(%.*s off %ld ino %ld)\n",
	512	namlen, name, offset, ino);
	513	*/
	514
	515	if (offset > ~((u32) 0)) {
	516	cd->common.err = nfserr_fbig;
	517	return -EINVAL;
	518	}
	519	if (cd->offset)
	520	*cd->offset = htonl(offset);
	521	if (namlen > NFS2_MAXNAMLEN)
	522	namlen = NFS2_MAXNAMLEN;/* truncate filename */
	523
	524	slen = XDR_QUADLEN(namlen);
	525	if ((buflen = cd->buflen - slen - 4) < 0) {
	526	cd->common.err = nfserr_toosmall;
	527	return -EINVAL;
	528	}
40ee5dc6 PS	529	if (ino > ~((u32) 0)) {
	530	cd->common.err = nfserr_fbig;
	531	return -EINVAL;
	532	}
1da177e4 LT	533	p++ = xdr_one; / mark entry present */
	534	p++ = htonl((u32) ino); / file id */
	535	p = xdr_encode_array(p, name, namlen);/* name length & name */
	536	cd->offset = p; /* remember pointer */
131a21c2	537	p++ = htonl(~0U); / offset of next entry */
1da177e4 LT	538
	539	cd->buflen = buflen;
	540	cd->buffer = p;
	541	cd->common.err = nfs_ok;
	542	return 0;
	543	}
	544
	545	/*
	546	* XDR release functions
	547	*/
	548	int
131a21c2	549	nfssvc_release_fhandle(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	550	struct nfsd_fhandle *resp)
	551	{
	552	fh_put(&resp->fh);
	553	return 1;
	554	}