Release 4.10 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);
}

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/* Helper function for NFSv2 ACL code */


__be32 *nfs2svc_decode_fh(__be32 *p, struct svc_fh *fhp)
{
	return decode_fh(p, fhp);
}

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static __be32 *

encode_fh(__be32 *p, struct svc_fh *fhp)
{
	memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE);
	return p + (NFS_FHSIZE>> 2);
}

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/*
 * 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;
}

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linus torvalds
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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;
}

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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;
}

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andi kleen
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andrew morton
andrew morton
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jamie lokier
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static __be32 *

encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
	     struct kstat *stat)
{
	struct dentry	*dentry = fhp->fh_dentry;
	int type;
	struct timespec time;
	u32 f;

	type = (stat->mode & S_IFMT);

	*p++ = htonl(nfs_ftypes[type >> 12]);
	*p++ = htonl((u32) stat->mode);
	*p++ = htonl((u32) stat->nlink);
	*p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
	*p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid));

	if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN) {
		*p++ = htonl(NFS_MAXPATHLEN);
	} else {
		*p++ = htonl((u32) stat->size);
	}
	*p++ = htonl((u32) stat->blksize);
	if (S_ISCHR(type) || S_ISBLK(type))
		*p++ = htonl(new_encode_dev(stat->rdev));
	else
		*p++ = htonl(0xffffffff);
	*p++ = htonl((u32) stat->blocks);
	switch (fsid_source(fhp)) {
	default:
	case FSIDSOURCE_DEV:
		*p++ = htonl(new_encode_dev(stat->dev));
		break;
	case FSIDSOURCE_FSID:
		*p++ = htonl((u32) fhp->fh_export->ex_fsid);
		break;
	case FSIDSOURCE_UUID:
		f = ((u32*)fhp->fh_export->ex_uuid)[0];
		f ^= ((u32*)fhp->fh_export->ex_uuid)[1];
		f ^= ((u32*)fhp->fh_export->ex_uuid)[2];
		f ^= ((u32*)fhp->fh_export->ex_uuid)[3];
		*p++ = htonl(f);
		break;
	}
	*p++ = htonl((u32) stat->ino);
	*p++ = htonl((u32) stat->atime.tv_sec);
	*p++ = htonl(stat->atime.tv_nsec ? stat->atime.tv_nsec / 1000 : 0);
	lease_get_mtime(d_inode(dentry), &time); 
	*p++ = htonl((u32) time.tv_sec);
	*p++ = htonl(time.tv_nsec ? time.tv_nsec / 1000 : 0); 
	*p++ = htonl((u32) stat->ctime.tv_sec);
	*p++ = htonl(stat->ctime.tv_nsec ? stat->ctime.tv_nsec / 1000 : 0);

	return p;
}

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andi kleen
andi kleen
36
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linus torvalds
linus torvalds
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jamie lokier
jamie lokier
29
5.69%
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david shaw
david shaw
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eric w. biederman
eric w. biederman
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david howells
david howells
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j. bruce fields
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/* 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);
}

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david shaw
david shaw
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/*
 * XDR decode functions
 */

int

nfssvc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
{
	return xdr_argsize_check(rqstp, p);
}

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int

nfssvc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args)
{
	p = decode_fh(p, &args->fh);
	if (!p)
		return 0;
	return xdr_argsize_check(rqstp, p);
}

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neil brown
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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);
}

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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);
}

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int

nfssvc_decode_readargs(struct svc_rqst *rqstp, __be32 *p,
					struct nfsd_readargs *args)
{
	unsigned int len;
	int v;
	p = decode_fh(p, &args->fh);
	if (!p)
		return 0;

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

	len = min_t(unsigned int, len, NFSSVC_MAXBLKSIZE_V2);

	/* set up somewhere to store response.
         * We take pages, put them on reslist and include in iovec
         */
	v=0;
	while (len > 0) {
		struct page *p = *(rqstp->rq_next_page++);

		rqstp->rq_vec[v].iov_base = page_address(p);
		rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
		len -= rqstp->rq_vec[v].iov_len;
		v++;
	}
	args->vlen = v;
	return xdr_argsize_check(rqstp, p);
}

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5
50.00%
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39.77%
1
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kinglong mee
kinglong mee
16
9.36%
1
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j. bruce fields
j. bruce fields
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benoit taine
benoit taine
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int

nfssvc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p,
					struct nfsd_writeargs *args)
{
	unsigned int len, hdr, dlen;
	int v;

	p = decode_fh(p, &args->fh);
	if (!p)
		return 0;

	p++;				/* beginoffset */
	args->offset = ntohl(*p++);	/* offset */
	p++;				/* totalcount */
	len = args->len = ntohl(*p++);
	/*
         * The protocol specifies a maximum of 8192 bytes.
         */
	if (len > NFSSVC_MAXBLKSIZE_V2)
		return 0;

	/*
         * Check to make sure that we got the right number of
         * bytes.
         */
	hdr = (void*)p - 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;
}

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46.49%
6
60.00%
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27.31%
1
10.00%
peter staubach
peter staubach
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23.99%
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benoit taine
benoit taine
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0.37%
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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);
}

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neil brown
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6.33%
1
33.33%
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1.27%
1
33.33%
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100.00%
3
100.00%


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);
}

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int

nfssvc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd_readlinkargs *args)
{
	p = decode_fh(p, &args->fh);
	if (!p)
		return 0;
	args->buffer = page_address(*(rqstp->rq_next_page++));

	return xdr_argsize_check(rqstp, p);
}

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neil brown
neil brown
51
82.26%
2
33.33%
benoit taine
benoit taine
5
8.06%
1
16.67%
j. bruce fields
j. bruce fields
4
6.45%
1
16.67%
al viro
al viro
1
1.61%
1
16.67%
pre-git
pre-git
1
1.61%
1
16.67%
Total
62
100.00%
6
100.00%


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);
}

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33.33%
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1.22%
1
33.33%
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neil brown
1
1.22%
1
33.33%
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82
100.00%
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100.00%


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);
}

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neil brown
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5.05%
1
33.33%
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1
1.01%
1
33.33%
Total
99
100.00%
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int

nfssvc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
					struct nfsd_readdirargs *args)
{
	p = decode_fh(p, &args->fh);
	if (!p)
		return 0;
	args->cookie = ntohl(*p++);
	args->count  = ntohl(*p++);
	args->count  = min_t(u32, args->count, PAGE_SIZE);
	args->buffer = page_address(*(rqstp->rq_next_page++));

	return xdr_argsize_check(rqstp, p);
}

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63.64%
1
14.29%
neil brown
neil brown
19
19.19%
2
28.57%
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kinglong mee
7
7.07%
1
14.29%
benoit taine
benoit taine
5
5.05%
1
14.29%
j. bruce fields
j. bruce fields
4
4.04%
1
14.29%
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al viro
1
1.01%
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99
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7
100.00%

/*
 * XDR encode functions
 */

int

nfssvc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
{
	return xdr_ressize_check(rqstp, p);
}

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96.15%
1
50.00%
al viro
al viro
1
3.85%
1
50.00%
Total
26
100.00%
2
100.00%


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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
pre-git
pre-git
38
82.61%
1
20.00%
david shaw
david shaw
5
10.87%
1
20.00%
al viro
al viro
1
2.17%
1
20.00%
neil brown
neil brown
1
2.17%
1
20.00%
linus torvalds
linus torvalds
1
2.17%
1
20.00%
Total
46
100.00%
5
100.00%


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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
pre-git
pre-git
49
84.48%
1
20.00%
david shaw
david shaw
5
8.62%
1
20.00%
linus torvalds
linus torvalds
2
3.45%
1
20.00%
neil brown
neil brown
1
1.72%
1
20.00%
al viro
al viro
1
1.72%
1
20.00%
Total
58
100.00%
5
100.00%


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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
neil brown
neil brown
62
62.00%
1
33.33%
pre-git
pre-git
37
37.00%
1
33.33%
al viro
al viro
1
1.00%
1
33.33%
Total
100
100.00%
3
100.00%


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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
neil brown
neil brown
63
52.50%
3
37.50%
pre-git
pre-git
49
40.83%
1
12.50%
david shaw
david shaw
5
4.17%
1
12.50%
linus torvalds
linus torvalds
1
0.83%
1
12.50%
lucas de marchi
lucas de marchi
1
0.83%
1
12.50%
al viro
al viro
1
0.83%
1
12.50%
Total
120
100.00%
8
100.00%


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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
neil brown
neil brown
54
65.85%
3
60.00%
pre-git
pre-git
27
32.93%
1
20.00%
al viro
al viro
1
1.22%
1
20.00%
Total
82
100.00%
5
100.00%


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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
pre-git
pre-git
88
96.70%
1
25.00%
andrew morton
andrew morton
1
1.10%
1
25.00%
al viro
al viro
1
1.10%
1
25.00%
greg banks
greg banks
1
1.10%
1
25.00%
Total
91
100.00%
4
100.00%


int

nfssvc_encode_entry(void *ccdv, const char *name,
		    int namlen, loff_t offset, u64 ino, unsigned int d_type)
{
	struct readdir_cd *ccd = ccdv;
	struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common);
	__be32	*p = cd->buffer;
	int	buflen, slen;

	/*
        dprintk("nfsd: entry(%.*s off %ld ino %ld)\n",
                        namlen, name, offset, ino);
         */

	if (offset > ~((u32) 0)) {
		cd->common.err = nfserr_fbig;
		return -EINVAL;
	}
	if (cd->offset)
		*cd->offset = htonl(offset);

	/* truncate filename */
	namlen = min(namlen, NFS2_MAXNAMLEN);
	slen = XDR_QUADLEN(namlen);

	if ((buflen = cd->buflen - slen - 4) < 0) {
		cd->common.err = nfserr_toosmall;
		return -EINVAL;
	}
	if (ino > ~((u32) 0)) {
		cd->common.err = nfserr_fbig;
		return -EINVAL;
	}
	*p++ = xdr_one;				/* mark entry present */
	*p++ = htonl((u32) ino);		/* file id */
	p    = xdr_encode_array(p, name, namlen);/* name length & name */
	cd->offset = p;			/* remember pointer */
	*p++ = htonl(~0U);		/* offset of next entry */

	cd->buflen = buflen;
	cd->buffer = p;
	cd->common.err = nfs_ok;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
pre-git
pre-git
166
66.14%
3
30.00%
neil brown
neil brown
46
18.33%
2
20.00%
peter staubach
peter staubach
26
10.36%
1
10.00%
kinglong mee
kinglong mee
6
2.39%
1
10.00%
al viro
al viro
5
1.99%
1
10.00%
linus torvalds
linus torvalds
1
0.40%
1
10.00%
andrew morton
andrew morton
1
0.40%
1
10.00%
Total
251
100.00%
10
100.00%

/*
 * XDR release functions
 */

int

nfssvc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
					struct nfsd_fhandle *resp)
{
	fh_put(&resp->fh);
	return 1;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
pre-git
pre-git
29
96.67%
1
50.00%
al viro
al viro
1
3.33%
1
50.00%
Total
30
100.00%
2
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
pre-git
pre-git
2006
62.40%
4
7.55%
neil brown
neil brown
647
20.12%
16
30.19%
peter staubach
peter staubach
91
2.83%
2
3.77%
al viro
al viro
90
2.80%
5
9.43%
andi kleen
andi kleen
56
1.74%
1
1.89%
eric w. biederman
eric w. biederman
52
1.62%
1
1.89%
andreas gruenbacher
andreas gruenbacher
49
1.52%
1
1.89%
david shaw
david shaw
42
1.31%
1
1.89%
linus torvalds
linus torvalds
38
1.18%
5
9.43%
jamie lokier
jamie lokier
33
1.03%
1
1.89%
kinglong mee
kinglong mee
29
0.90%
1
1.89%
j. bruce fields
j. bruce fields
27
0.84%
5
9.43%
benoit taine
benoit taine
25
0.78%
1
1.89%
andrew morton
andrew morton
20
0.62%
3
5.66%
chuck lever
chuck lever
4
0.12%
2
3.77%
david howells
david howells
3
0.09%
1
1.89%
greg banks
greg banks
1
0.03%
1
1.89%
boaz harrosh
boaz harrosh
1
0.03%
1
1.89%
lucas de marchi
lucas de marchi
1
0.03%
1
1.89%
Total
3215
100.00%
53
100.00%
Directory: fs/nfsd

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