[linux.git] / fs / nfsd / nfsxdr.c

/*
 * linux/fs/nfsd/nfsxdr.c
 *
 * XDR support for nfsd
 *
 * Copyright (C) 1995, 1996 Olaf Kirch <[email protected]>
 */

#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>
#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	/*
f30c2269	2	* linux/fs/nfsd/nfsxdr.c
1da177e4 LT	3	*
	4	* XDR support for nfsd
	5	*
	6	* Copyright (C) 1995, 1996 Olaf Kirch <[email protected]>
	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>
2e8138a2	18	#include "auth.h"
1da177e4 LT	19
	20	#define NFSDDBG_FACILITY NFSDDBG_XDR
	21
1da177e4 LT	22	/*
	23	* Mapping of S_IF* types to NFS file types
	24	*/
	25	static u32 nfs_ftypes[] = {
	26	NFNON, NFCHR, NFCHR, NFBAD,
	27	NFDIR, NFBAD, NFBLK, NFBAD,
	28	NFREG, NFBAD, NFLNK, NFBAD,
	29	NFSOCK, NFBAD, NFLNK, NFBAD,
	30	};
	31
	32
	33	/*
	34	* XDR functions for basic NFS types
	35	*/
131a21c2 AV	36	static __be32 *
131a21c2 AV	37	decode_fh(__be32 p, struct svc_fh fhp)
1da177e4 LT	38	{
	39	fh_init(fhp, NFS_FHSIZE);
	40	memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE);
	41	fhp->fh_handle.fh_size = NFS_FHSIZE;
	42
	43	/* FIXME: Look up export pointer here and verify
	44	* Sun Secure RPC if requested */
	45	return p + (NFS_FHSIZE >> 2);
	46	}
	47
a257cdd0	48	/* Helper function for NFSv2 ACL code */
131a21c2	49	__be32 nfs2svc_decode_fh(__be32 p, struct svc_fh *fhp)
a257cdd0 AG	50	{
	51	return decode_fh(p, fhp);
	52	}
	53
3ee6f61c	54	static __be32 *
131a21c2	55	encode_fh(__be32 p, struct svc_fh fhp)
1da177e4 LT	56	{
	57	memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE);
	58	return p + (NFS_FHSIZE>> 2);
	59	}
	60
	61	/*
	62	* Decode a file name and make sure that the path contains
	63	* no slashes or null bytes.
	64	*/
3ee6f61c	65	static __be32 *
ee1a95b3	66	decode_filename(__be32 p, char namp, unsigned int lenp)
1da177e4 LT	67	{
1da177e4 LT	68	char *name;
ee1a95b3	69	unsigned int i;
1da177e4 LT	70
	71	if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXNAMLEN)) != NULL) {
	72	for (i = 0, name = namp; i < lenp; i++, name++) {
	73	if (name == '\0' \|\| name == '/')
	74	return NULL;
	75	}
	76	}
	77
	78	return p;
	79	}
	80
3ee6f61c	81	static __be32 *
9c7544d3	82	decode_pathname(__be32 p, char namp, unsigned int lenp)
1da177e4 LT	83	{
1da177e4 LT	84	char *name;
9c7544d3	85	unsigned int i;
1da177e4 LT	86
	87	if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXPATHLEN)) != NULL) {
	88	for (i = 0, name = namp; i < lenp; i++, name++) {
	89	if (*name == '\0')
	90	return NULL;
	91	}
	92	}
	93
	94	return p;
	95	}
	96
3ee6f61c	97	static __be32 *
131a21c2	98	decode_sattr(__be32 p, struct iattr iap)
1da177e4 LT	99	{
	100	u32 tmp, tmp1;
	101
	102	iap->ia_valid = 0;
	103
	104	/* Sun client bug compatibility check: some sun clients seem to
	105	* put 0xffff in the mode field when they mean 0xffffffff.
	106	* Quoting the 4.4BSD nfs server code: Nah nah nah nah na nah.
	107	*/
	108	if ((tmp = ntohl(*p++)) != (u32)-1 && tmp != 0xffff) {
	109	iap->ia_valid \|= ATTR_MODE;
	110	iap->ia_mode = tmp;
	111	}
	112	if ((tmp = ntohl(*p++)) != (u32)-1) {
	113	iap->ia_valid \|= ATTR_UID;
	114	iap->ia_uid = tmp;
	115	}
	116	if ((tmp = ntohl(*p++)) != (u32)-1) {
	117	iap->ia_valid \|= ATTR_GID;
	118	iap->ia_gid = tmp;
	119	}
	120	if ((tmp = ntohl(*p++)) != (u32)-1) {
	121	iap->ia_valid \|= ATTR_SIZE;
	122	iap->ia_size = tmp;
	123	}
	124	tmp = ntohl(p++); tmp1 = ntohl(p++);
	125	if (tmp != (u32)-1 && tmp1 != (u32)-1) {
	126	iap->ia_valid \|= ATTR_ATIME \| ATTR_ATIME_SET;
	127	iap->ia_atime.tv_sec = tmp;
	128	iap->ia_atime.tv_nsec = tmp1 * 1000;
	129	}
	130	tmp = ntohl(p++); tmp1 = ntohl(p++);
	131	if (tmp != (u32)-1 && tmp1 != (u32)-1) {
	132	iap->ia_valid \|= ATTR_MTIME \| ATTR_MTIME_SET;
	133	iap->ia_mtime.tv_sec = tmp;
	134	iap->ia_mtime.tv_nsec = tmp1 * 1000;
	135	/*
	136	* Passing the invalid value useconds=1000000 for mtime
	137	* is a Sun convention for "set both mtime and atime to
	138	* current server time". It's needed to make permissions
	139	* checks for the "touch" program across v2 mounts to
	140	* Solaris and Irix boxes work correctly. See description of
	141	* sattr in section 6.1 of "NFS Illustrated" by
	142	* Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5
	143	*/
	144	if (tmp1 == 1000000)
	145	iap->ia_valid &= ~(ATTR_ATIME_SET\|ATTR_MTIME_SET);
	146	}
	147	return p;
	148	}
	149
131a21c2 AV	150	static __be32 *
131a21c2 AV	151	encode_fattr(struct svc_rqst rqstp, __be32 p, struct svc_fh *fhp,
a334de28	152	struct kstat *stat)
1da177e4	153	{
1da177e4	154	struct dentry *dentry = fhp->fh_dentry;
1da177e4 LT	155	int type;
1da177e4 LT	156	struct timespec time;
af6a4e28	157	u32 f;
1da177e4	158
a334de28	159	type = (stat->mode & S_IFMT);
1da177e4 LT	160
1da177e4 LT	161	*p++ = htonl(nfs_ftypes[type >> 12]);
a334de28 DS	162	*p++ = htonl((u32) stat->mode);
	163	*p++ = htonl((u32) stat->nlink);
	164	*p++ = htonl((u32) nfsd_ruid(rqstp, stat->uid));
	165	*p++ = htonl((u32) nfsd_rgid(rqstp, stat->gid));
1da177e4	166
a334de28	167	if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN) {
1da177e4 LT	168	*p++ = htonl(NFS_MAXPATHLEN);
1da177e4 LT	169	} else {
a334de28	170	*p++ = htonl((u32) stat->size);
1da177e4	171	}
a334de28	172	*p++ = htonl((u32) stat->blksize);
1da177e4	173	if (S_ISCHR(type) \|\| S_ISBLK(type))
a334de28	174	*p++ = htonl(new_encode_dev(stat->rdev));
1da177e4 LT	175	else
1da177e4 LT	176	*p++ = htonl(0xffffffff);
a334de28	177	*p++ = htonl((u32) stat->blocks);
af6a4e28 N	178	switch (fsid_source(fhp)) {
	179	default:
	180	case FSIDSOURCE_DEV:
a334de28	181	*p++ = htonl(new_encode_dev(stat->dev));
af6a4e28 N	182	break;
	183	case FSIDSOURCE_FSID:
	184	*p++ = htonl((u32) fhp->fh_export->ex_fsid);
	185	break;
	186	case FSIDSOURCE_UUID:
	187	f = ((u32*)fhp->fh_export->ex_uuid)[0];
	188	f ^= ((u32*)fhp->fh_export->ex_uuid)[1];
	189	f ^= ((u32*)fhp->fh_export->ex_uuid)[2];
	190	f ^= ((u32*)fhp->fh_export->ex_uuid)[3];
	191	*p++ = htonl(f);
	192	break;
	193	}
a334de28 DS	194	*p++ = htonl((u32) stat->ino);
	195	*p++ = htonl((u32) stat->atime.tv_sec);
	196	*p++ = htonl(stat->atime.tv_nsec ? stat->atime.tv_nsec / 1000 : 0);
1da177e4 LT	197	lease_get_mtime(dentry->d_inode, &time);
	198	*p++ = htonl((u32) time.tv_sec);
	199	*p++ = htonl(time.tv_nsec ? time.tv_nsec / 1000 : 0);
a334de28 DS	200	*p++ = htonl((u32) stat->ctime.tv_sec);
a334de28 DS	201	*p++ = htonl(stat->ctime.tv_nsec ? stat->ctime.tv_nsec / 1000 : 0);
1da177e4 LT	202
	203	return p;
	204	}
	205
a257cdd0	206	/* Helper function for NFSv2 ACL code */
131a21c2	207	__be32 nfs2svc_encode_fattr(struct svc_rqst rqstp, __be32 p, struct svc_fh fhp)
a257cdd0	208	{
a334de28	209	struct kstat stat;
54775491	210	vfs_getattr(fhp->fh_export->ex_path.mnt, fhp->fh_dentry, &stat);
a334de28	211	return encode_fattr(rqstp, p, fhp, &stat);
a257cdd0	212	}
1da177e4 LT	213
	214	/*
	215	* XDR decode functions
	216	*/
	217	int
131a21c2	218	nfssvc_decode_void(struct svc_rqst rqstp, __be32 p, void *dummy)
1da177e4 LT	219	{
	220	return xdr_argsize_check(rqstp, p);
	221	}
	222
	223	int
131a21c2	224	nfssvc_decode_fhandle(struct svc_rqst rqstp, __be32 p, struct nfsd_fhandle *args)
1da177e4 LT	225	{
	226	if (!(p = decode_fh(p, &args->fh)))
	227	return 0;
	228	return xdr_argsize_check(rqstp, p);
	229	}
	230
	231	int
131a21c2	232	nfssvc_decode_sattrargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	233	struct nfsd_sattrargs *args)
1da177e4 LT	234	{
072f62ed N	235	p = decode_fh(p, &args->fh);
072f62ed N	236	if (!p)
1da177e4	237	return 0;
072f62ed	238	p = decode_sattr(p, &args->attrs);
1da177e4 LT	239
	240	return xdr_argsize_check(rqstp, p);
	241	}
	242
	243	int
131a21c2	244	nfssvc_decode_diropargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	245	struct nfsd_diropargs *args)
	246	{
	247	if (!(p = decode_fh(p, &args->fh))
	248	\|\| !(p = decode_filename(p, &args->name, &args->len)))
	249	return 0;
	250
	251	return xdr_argsize_check(rqstp, p);
	252	}
	253
	254	int
131a21c2	255	nfssvc_decode_readargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	256	struct nfsd_readargs *args)
	257	{
	258	unsigned int len;
	259	int v,pn;
	260	if (!(p = decode_fh(p, &args->fh)))
	261	return 0;
	262
	263	args->offset = ntohl(*p++);
	264	len = args->count = ntohl(*p++);
	265	p++; /* totalcount - unused */
	266
7adae489 GB	267	if (len > NFSSVC_MAXBLKSIZE_V2)
7adae489 GB	268	len = NFSSVC_MAXBLKSIZE_V2;
1da177e4 LT	269
	270	/* set up somewhere to store response.
	271	* We take pages, put them on reslist and include in iovec
	272	*/
	273	v=0;
	274	while (len > 0) {
44524359	275	pn = rqstp->rq_resused++;
3cc03b16 N	276	rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_respages[pn]);
	277	rqstp->rq_vec[v].iov_len = len < PAGE_SIZE?len:PAGE_SIZE;
	278	len -= rqstp->rq_vec[v].iov_len;
1da177e4 LT	279	v++;
	280	}
	281	args->vlen = v;
	282	return xdr_argsize_check(rqstp, p);
	283	}
	284
	285	int
131a21c2	286	nfssvc_decode_writeargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	287	struct nfsd_writeargs *args)
1da177e4 LT	288	{
f34b9568	289	unsigned int len, hdr, dlen;
1da177e4	290	int v;
f34b9568	291
1da177e4 LT	292	if (!(p = decode_fh(p, &args->fh)))
	293	return 0;
	294
	295	p++; /* beginoffset */
	296	args->offset = ntohl(p++); / offset */
	297	p++; /* totalcount */
	298	len = args->len = ntohl(*p++);
f34b9568 PS	299	/*
	300	* The protocol specifies a maximum of 8192 bytes.
	301	*/
7adae489	302	if (len > NFSSVC_MAXBLKSIZE_V2)
f34b9568 PS	303	return 0;
	304
	305	/*
	306	* Check to make sure that we got the right number of
	307	* bytes.
f34b9568 PS	308	*/
f34b9568 PS	309	hdr = (void*)p - rqstp->rq_arg.head[0].iov_base;
072f62ed N	310	dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len
	311	- hdr;
	312
f34b9568 PS	313	/*
	314	* Round the length of the data which was specified up to
	315	* the next multiple of XDR units and then compare that
	316	* against the length which was actually received.
ba67a39e N	317	* Note that when RPCSEC/GSS (for example) is used, the
	318	* data buffer can be padded so dlen might be larger
	319	* than required. It must never be smaller.
f34b9568	320	*/
ba67a39e	321	if (dlen < XDR_QUADLEN(len)*4)
f34b9568 PS	322	return 0;
	323
	324	rqstp->rq_vec[0].iov_base = (void*)p;
	325	rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
1da177e4	326	v = 0;
3cc03b16 N	327	while (len > rqstp->rq_vec[v].iov_len) {
3cc03b16 N	328	len -= rqstp->rq_vec[v].iov_len;
1da177e4	329	v++;
3cc03b16 N	330	rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
3cc03b16 N	331	rqstp->rq_vec[v].iov_len = PAGE_SIZE;
1da177e4	332	}
3cc03b16	333	rqstp->rq_vec[v].iov_len = len;
f34b9568 PS	334	args->vlen = v + 1;
f34b9568 PS	335	return 1;
1da177e4 LT	336	}
	337
	338	int
131a21c2	339	nfssvc_decode_createargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	340	struct nfsd_createargs *args)
1da177e4 LT	341	{
072f62ed N	342	if ( !(p = decode_fh(p, &args->fh))
072f62ed N	343	\|\| !(p = decode_filename(p, &args->name, &args->len)))
1da177e4	344	return 0;
072f62ed	345	p = decode_sattr(p, &args->attrs);
1da177e4 LT	346
	347	return xdr_argsize_check(rqstp, p);
	348	}
	349
	350	int
131a21c2	351	nfssvc_decode_renameargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	352	struct nfsd_renameargs *args)
	353	{
	354	if (!(p = decode_fh(p, &args->ffh))
	355	\|\| !(p = decode_filename(p, &args->fname, &args->flen))
	356	\|\| !(p = decode_fh(p, &args->tfh))
	357	\|\| !(p = decode_filename(p, &args->tname, &args->tlen)))
	358	return 0;
	359
	360	return xdr_argsize_check(rqstp, p);
	361	}
	362
	363	int
131a21c2	364	nfssvc_decode_readlinkargs(struct svc_rqst rqstp, __be32 p, struct nfsd_readlinkargs *args)
1da177e4 LT	365	{
	366	if (!(p = decode_fh(p, &args->fh)))
	367	return 0;
44524359	368	args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused++]);
1da177e4 LT	369
	370	return xdr_argsize_check(rqstp, p);
	371	}
	372
	373	int
131a21c2	374	nfssvc_decode_linkargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	375	struct nfsd_linkargs *args)
	376	{
	377	if (!(p = decode_fh(p, &args->ffh))
	378	\|\| !(p = decode_fh(p, &args->tfh))
	379	\|\| !(p = decode_filename(p, &args->tname, &args->tlen)))
	380	return 0;
	381
	382	return xdr_argsize_check(rqstp, p);
	383	}
	384
	385	int
131a21c2	386	nfssvc_decode_symlinkargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	387	struct nfsd_symlinkargs *args)
1da177e4 LT	388	{
072f62ed N	389	if ( !(p = decode_fh(p, &args->ffh))
	390	\|\| !(p = decode_filename(p, &args->fname, &args->flen))
	391	\|\| !(p = decode_pathname(p, &args->tname, &args->tlen)))
1da177e4	392	return 0;
072f62ed	393	p = decode_sattr(p, &args->attrs);
1da177e4 LT	394
	395	return xdr_argsize_check(rqstp, p);
	396	}
	397
	398	int
131a21c2	399	nfssvc_decode_readdirargs(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	400	struct nfsd_readdirargs *args)
	401	{
	402	if (!(p = decode_fh(p, &args->fh)))
	403	return 0;
	404	args->cookie = ntohl(*p++);
	405	args->count = ntohl(*p++);
	406	if (args->count > PAGE_SIZE)
	407	args->count = PAGE_SIZE;
	408
44524359	409	args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused++]);
1da177e4 LT	410
	411	return xdr_argsize_check(rqstp, p);
	412	}
	413
	414	/*
	415	* XDR encode functions
	416	*/
	417	int
131a21c2	418	nfssvc_encode_void(struct svc_rqst rqstp, __be32 p, void *dummy)
1da177e4 LT	419	{
	420	return xdr_ressize_check(rqstp, p);
	421	}
	422
	423	int
131a21c2	424	nfssvc_encode_attrstat(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	425	struct nfsd_attrstat *resp)
1da177e4 LT	426	{
a334de28	427	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
1da177e4 LT	428	return xdr_ressize_check(rqstp, p);
	429	}
	430
	431	int
131a21c2	432	nfssvc_encode_diropres(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	433	struct nfsd_diropres *resp)
	434	{
	435	p = encode_fh(p, &resp->fh);
a334de28	436	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
1da177e4 LT	437	return xdr_ressize_check(rqstp, p);
	438	}
	439
	440	int
131a21c2	441	nfssvc_encode_readlinkres(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	442	struct nfsd_readlinkres *resp)
	443	{
	444	*p++ = htonl(resp->len);
	445	xdr_ressize_check(rqstp, p);
	446	rqstp->rq_res.page_len = resp->len;
	447	if (resp->len & 3) {
	448	/* need to pad the tail */
1da177e4 LT	449	rqstp->rq_res.tail[0].iov_base = p;
	450	*p = 0;
	451	rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
	452	}
	453	return 1;
	454	}
	455
	456	int
131a21c2	457	nfssvc_encode_readres(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	458	struct nfsd_readres *resp)
1da177e4 LT	459	{
a334de28	460	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
1da177e4 LT	461	*p++ = htonl(resp->count);
	462	xdr_ressize_check(rqstp, p);
	463
	464	/* now update rqstp->rq_res to reflect data aswell */
	465	rqstp->rq_res.page_len = resp->count;
	466	if (resp->count & 3) {
	467	/* need to pad the tail */
1da177e4 LT	468	rqstp->rq_res.tail[0].iov_base = p;
	469	*p = 0;
	470	rqstp->rq_res.tail[0].iov_len = 4 - (resp->count&3);
	471	}
	472	return 1;
	473	}
	474
	475	int
131a21c2	476	nfssvc_encode_readdirres(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	477	struct nfsd_readdirres *resp)
	478	{
	479	xdr_ressize_check(rqstp, p);
	480	p = resp->buffer;
	481	p++ = 0; / no more entries */
	482	*p++ = htonl((resp->common.err == nfserr_eof));
	483	rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1;
	484
	485	return 1;
	486	}
	487
	488	int
131a21c2	489	nfssvc_encode_statfsres(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	490	struct nfsd_statfsres *resp)
	491	{
	492	struct kstatfs *stat = &resp->stats;
	493
7adae489	494	p++ = htonl(NFSSVC_MAXBLKSIZE_V2); / max transfer size */
1da177e4 LT	495	*p++ = htonl(stat->f_bsize);
	496	*p++ = htonl(stat->f_blocks);
	497	*p++ = htonl(stat->f_bfree);
	498	*p++ = htonl(stat->f_bavail);
	499	return xdr_ressize_check(rqstp, p);
	500	}
	501
	502	int
a0ad13ef N	503	nfssvc_encode_entry(void ccdv, const char name,
a0ad13ef N	504	int namlen, loff_t offset, u64 ino, unsigned int d_type)
1da177e4	505	{
a0ad13ef	506	struct readdir_cd *ccd = ccdv;
1da177e4	507	struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common);
131a21c2	508	__be32 *p = cd->buffer;
1da177e4 LT	509	int buflen, slen;
	510
	511	/*
	512	dprintk("nfsd: entry(%.*s off %ld ino %ld)\n",
	513	namlen, name, offset, ino);
	514	*/
	515
	516	if (offset > ~((u32) 0)) {
	517	cd->common.err = nfserr_fbig;
	518	return -EINVAL;
	519	}
	520	if (cd->offset)
	521	*cd->offset = htonl(offset);
	522	if (namlen > NFS2_MAXNAMLEN)
	523	namlen = NFS2_MAXNAMLEN;/* truncate filename */
	524
	525	slen = XDR_QUADLEN(namlen);
	526	if ((buflen = cd->buflen - slen - 4) < 0) {
	527	cd->common.err = nfserr_toosmall;
	528	return -EINVAL;
	529	}
40ee5dc6 PS	530	if (ino > ~((u32) 0)) {
	531	cd->common.err = nfserr_fbig;
	532	return -EINVAL;
	533	}
1da177e4 LT	534	p++ = xdr_one; / mark entry present */
	535	p++ = htonl((u32) ino); / file id */
	536	p = xdr_encode_array(p, name, namlen);/* name length & name */
	537	cd->offset = p; /* remember pointer */
131a21c2	538	p++ = htonl(~0U); / offset of next entry */
1da177e4 LT	539
	540	cd->buflen = buflen;
	541	cd->buffer = p;
	542	cd->common.err = nfs_ok;
	543	return 0;
	544	}
	545
	546	/*
	547	* XDR release functions
	548	*/
	549	int
131a21c2	550	nfssvc_release_fhandle(struct svc_rqst rqstp, __be32 p,
1da177e4 LT	551	struct nfsd_fhandle *resp)
	552	{
	553	fh_put(&resp->fh);
	554	return 1;
	555	}