nfs3xdr.c 55.7 KB
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// SPDX-License-Identifier: GPL-2.0
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/*
 * linux/fs/nfs/nfs3xdr.c
 *
 * XDR functions to encode/decode NFSv3 RPC arguments and results.
 *
 * Copyright (C) 1996, 1997 Olaf Kirch
 */

#include <linux/param.h>
#include <linux/time.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/in.h>
#include <linux/pagemap.h>
#include <linux/proc_fs.h>
#include <linux/kdev_t.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfs.h>
#include <linux/nfs3.h>
#include <linux/nfs_fs.h>
#include <linux/nfsacl.h>
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#include "nfstrace.h"
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#include "internal.h"

#define NFSDBG_FACILITY		NFSDBG_XDR

/* Mapping from NFS error code to "errno" error code. */
#define errno_NFSERR_IO		EIO

/*
 * Declare the space requirements for NFS arguments and replies as
 * number of 32bit-words
 */
#define NFS3_fhandle_sz		(1+16)
#define NFS3_fh_sz		(NFS3_fhandle_sz)	/* shorthand */
#define NFS3_sattr_sz		(15)
#define NFS3_filename_sz	(1+(NFS3_MAXNAMLEN>>2))
#define NFS3_path_sz		(1+(NFS3_MAXPATHLEN>>2))
#define NFS3_fattr_sz		(21)
#define NFS3_cookieverf_sz	(NFS3_COOKIEVERFSIZE>>2)
#define NFS3_wcc_attr_sz	(6)
#define NFS3_pre_op_attr_sz	(1+NFS3_wcc_attr_sz)
#define NFS3_post_op_attr_sz	(1+NFS3_fattr_sz)
#define NFS3_wcc_data_sz	(NFS3_pre_op_attr_sz+NFS3_post_op_attr_sz)
#define NFS3_diropargs_sz	(NFS3_fh_sz+NFS3_filename_sz)

#define NFS3_getattrargs_sz	(NFS3_fh_sz)
#define NFS3_setattrargs_sz	(NFS3_fh_sz+NFS3_sattr_sz+3)
#define NFS3_lookupargs_sz	(NFS3_fh_sz+NFS3_filename_sz)
#define NFS3_accessargs_sz	(NFS3_fh_sz+1)
#define NFS3_readlinkargs_sz	(NFS3_fh_sz)
#define NFS3_readargs_sz	(NFS3_fh_sz+3)
#define NFS3_writeargs_sz	(NFS3_fh_sz+5)
#define NFS3_createargs_sz	(NFS3_diropargs_sz+NFS3_sattr_sz)
#define NFS3_mkdirargs_sz	(NFS3_diropargs_sz+NFS3_sattr_sz)
#define NFS3_symlinkargs_sz	(NFS3_diropargs_sz+1+NFS3_sattr_sz)
#define NFS3_mknodargs_sz	(NFS3_diropargs_sz+2+NFS3_sattr_sz)
#define NFS3_removeargs_sz	(NFS3_fh_sz+NFS3_filename_sz)
#define NFS3_renameargs_sz	(NFS3_diropargs_sz+NFS3_diropargs_sz)
#define NFS3_linkargs_sz		(NFS3_fh_sz+NFS3_diropargs_sz)
#define NFS3_readdirargs_sz	(NFS3_fh_sz+NFS3_cookieverf_sz+3)
#define NFS3_readdirplusargs_sz	(NFS3_fh_sz+NFS3_cookieverf_sz+4)
#define NFS3_commitargs_sz	(NFS3_fh_sz+3)

#define NFS3_getattrres_sz	(1+NFS3_fattr_sz)
#define NFS3_setattrres_sz	(1+NFS3_wcc_data_sz)
#define NFS3_removeres_sz	(NFS3_setattrres_sz)
#define NFS3_lookupres_sz	(1+NFS3_fh_sz+(2 * NFS3_post_op_attr_sz))
#define NFS3_accessres_sz	(1+NFS3_post_op_attr_sz+1)
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#define NFS3_readlinkres_sz	(1+NFS3_post_op_attr_sz+1+1)
#define NFS3_readres_sz		(1+NFS3_post_op_attr_sz+3+1)
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#define NFS3_writeres_sz	(1+NFS3_wcc_data_sz+4)
#define NFS3_createres_sz	(1+NFS3_fh_sz+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
#define NFS3_renameres_sz	(1+(2 * NFS3_wcc_data_sz))
#define NFS3_linkres_sz		(1+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
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#define NFS3_readdirres_sz	(1+NFS3_post_op_attr_sz+2+1)
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#define NFS3_fsstatres_sz	(1+NFS3_post_op_attr_sz+13)
#define NFS3_fsinfores_sz	(1+NFS3_post_op_attr_sz+12)
#define NFS3_pathconfres_sz	(1+NFS3_post_op_attr_sz+6)
#define NFS3_commitres_sz	(1+NFS3_wcc_data_sz+2)

#define ACL3_getaclargs_sz	(NFS3_fh_sz+1)
#define ACL3_setaclargs_sz	(NFS3_fh_sz+1+ \
				XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
#define ACL3_getaclres_sz	(1+NFS3_post_op_attr_sz+1+ \
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				XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE)+1)
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#define ACL3_setaclres_sz	(1+NFS3_post_op_attr_sz)

static int nfs3_stat_to_errno(enum nfs_stat);

/*
 * Map file type to S_IFMT bits
 */
static const umode_t nfs_type2fmt[] = {
	[NF3BAD] = 0,
	[NF3REG] = S_IFREG,
	[NF3DIR] = S_IFDIR,
	[NF3BLK] = S_IFBLK,
	[NF3CHR] = S_IFCHR,
	[NF3LNK] = S_IFLNK,
	[NF3SOCK] = S_IFSOCK,
	[NF3FIFO] = S_IFIFO,
};

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static struct user_namespace *rpc_userns(const struct rpc_clnt *clnt)
{
	if (clnt && clnt->cl_cred)
		return clnt->cl_cred->user_ns;
	return &init_user_ns;
}

static struct user_namespace *rpc_rqst_userns(const struct rpc_rqst *rqstp)
{
	if (rqstp->rq_task)
		return rpc_userns(rqstp->rq_task->tk_client);
	return &init_user_ns;
}

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/*
 * Encode/decode NFSv3 basic data types
 *
 * Basic NFSv3 data types are defined in section 2.5 of RFC 1813:
 * "NFS Version 3 Protocol Specification".
 *
 * Not all basic data types have their own encoding and decoding
 * functions.  For run-time efficiency, some data types are encoded
 * or decoded inline.
 */

static void encode_uint32(struct xdr_stream *xdr, u32 value)
{
	__be32 *p = xdr_reserve_space(xdr, 4);
	*p = cpu_to_be32(value);
}

static int decode_uint32(struct xdr_stream *xdr, u32 *value)
{
	__be32 *p;

	p = xdr_inline_decode(xdr, 4);
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	if (unlikely(!p))
		return -EIO;
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	*value = be32_to_cpup(p);
	return 0;
}

static int decode_uint64(struct xdr_stream *xdr, u64 *value)
{
	__be32 *p;

	p = xdr_inline_decode(xdr, 8);
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	if (unlikely(!p))
		return -EIO;
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	xdr_decode_hyper(p, value);
	return 0;
}

/*
 * fileid3
 *
 *	typedef uint64 fileid3;
 */
static __be32 *xdr_decode_fileid3(__be32 *p, u64 *fileid)
{
	return xdr_decode_hyper(p, fileid);
}

static int decode_fileid3(struct xdr_stream *xdr, u64 *fileid)
{
	return decode_uint64(xdr, fileid);
}

/*
 * filename3
 *
 *	typedef string filename3<>;
 */
static void encode_filename3(struct xdr_stream *xdr,
			     const char *name, u32 length)
{
	__be32 *p;

	WARN_ON_ONCE(length > NFS3_MAXNAMLEN);
	p = xdr_reserve_space(xdr, 4 + length);
	xdr_encode_opaque(p, name, length);
}

static int decode_inline_filename3(struct xdr_stream *xdr,
				   const char **name, u32 *length)
{
	__be32 *p;
	u32 count;

	p = xdr_inline_decode(xdr, 4);
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	if (unlikely(!p))
		return -EIO;
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	count = be32_to_cpup(p);
	if (count > NFS3_MAXNAMLEN)
		goto out_nametoolong;
	p = xdr_inline_decode(xdr, count);
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	if (unlikely(!p))
		return -EIO;
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	*name = (const char *)p;
	*length = count;
	return 0;

out_nametoolong:
	dprintk("NFS: returned filename too long: %u\n", count);
	return -ENAMETOOLONG;
}

/*
 * nfspath3
 *
 *	typedef string nfspath3<>;
 */
static void encode_nfspath3(struct xdr_stream *xdr, struct page **pages,
			    const u32 length)
{
	encode_uint32(xdr, length);
	xdr_write_pages(xdr, pages, 0, length);
}

static int decode_nfspath3(struct xdr_stream *xdr)
{
	u32 recvd, count;
	__be32 *p;

	p = xdr_inline_decode(xdr, 4);
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	if (unlikely(!p))
		return -EIO;
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	count = be32_to_cpup(p);
	if (unlikely(count >= xdr->buf->page_len || count > NFS3_MAXPATHLEN))
		goto out_nametoolong;
	recvd = xdr_read_pages(xdr, count);
	if (unlikely(count > recvd))
		goto out_cheating;
	xdr_terminate_string(xdr->buf, count);
	return 0;

out_nametoolong:
	dprintk("NFS: returned pathname too long: %u\n", count);
	return -ENAMETOOLONG;
out_cheating:
	dprintk("NFS: server cheating in pathname result: "
		"count %u > recvd %u\n", count, recvd);
	return -EIO;
}

/*
 * cookie3
 *
 *	typedef uint64 cookie3
 */
static __be32 *xdr_encode_cookie3(__be32 *p, u64 cookie)
{
	return xdr_encode_hyper(p, cookie);
}

static int decode_cookie3(struct xdr_stream *xdr, u64 *cookie)
{
	return decode_uint64(xdr, cookie);
}

/*
 * cookieverf3
 *
 *	typedef opaque cookieverf3[NFS3_COOKIEVERFSIZE];
 */
static __be32 *xdr_encode_cookieverf3(__be32 *p, const __be32 *verifier)
{
	memcpy(p, verifier, NFS3_COOKIEVERFSIZE);
	return p + XDR_QUADLEN(NFS3_COOKIEVERFSIZE);
}

static int decode_cookieverf3(struct xdr_stream *xdr, __be32 *verifier)
{
	__be32 *p;

	p = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
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	if (unlikely(!p))
		return -EIO;
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	memcpy(verifier, p, NFS3_COOKIEVERFSIZE);
	return 0;
}

/*
 * createverf3
 *
 *	typedef opaque createverf3[NFS3_CREATEVERFSIZE];
 */
static void encode_createverf3(struct xdr_stream *xdr, const __be32 *verifier)
{
	__be32 *p;

	p = xdr_reserve_space(xdr, NFS3_CREATEVERFSIZE);
	memcpy(p, verifier, NFS3_CREATEVERFSIZE);
}

static int decode_writeverf3(struct xdr_stream *xdr, struct nfs_write_verifier *verifier)
{
	__be32 *p;

	p = xdr_inline_decode(xdr, NFS3_WRITEVERFSIZE);
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	if (unlikely(!p))
		return -EIO;
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	memcpy(verifier->data, p, NFS3_WRITEVERFSIZE);
	return 0;
}

/*
 * size3
 *
 *	typedef uint64 size3;
 */
static __be32 *xdr_decode_size3(__be32 *p, u64 *size)
{
	return xdr_decode_hyper(p, size);
}

/*
 * nfsstat3
 *
 *	enum nfsstat3 {
 *		NFS3_OK = 0,
 *		...
 *	}
 */
#define NFS3_OK		NFS_OK

static int decode_nfsstat3(struct xdr_stream *xdr, enum nfs_stat *status)
{
	__be32 *p;

	p = xdr_inline_decode(xdr, 4);
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	if (unlikely(!p))
		return -EIO;
	if (unlikely(*p != cpu_to_be32(NFS3_OK)))
		goto out_status;
	*status = 0;
	return 0;
out_status:
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	*status = be32_to_cpup(p);
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	trace_nfs_xdr_status(xdr, (int)*status);
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	return 0;
}

/*
 * ftype3
 *
 *	enum ftype3 {
 *		NF3REG	= 1,
 *		NF3DIR	= 2,
 *		NF3BLK	= 3,
 *		NF3CHR	= 4,
 *		NF3LNK	= 5,
 *		NF3SOCK	= 6,
 *		NF3FIFO	= 7
 *	};
 */
static void encode_ftype3(struct xdr_stream *xdr, const u32 type)
{
	encode_uint32(xdr, type);
}

static __be32 *xdr_decode_ftype3(__be32 *p, umode_t *mode)
{
	u32 type;

	type = be32_to_cpup(p++);
	if (type > NF3FIFO)
		type = NF3NON;
	*mode = nfs_type2fmt[type];
	return p;
}

/*
 * specdata3
 *
 *     struct specdata3 {
 *             uint32  specdata1;
 *             uint32  specdata2;
 *     };
 */
static void encode_specdata3(struct xdr_stream *xdr, const dev_t rdev)
{
	__be32 *p;

	p = xdr_reserve_space(xdr, 8);
	*p++ = cpu_to_be32(MAJOR(rdev));
	*p = cpu_to_be32(MINOR(rdev));
}

static __be32 *xdr_decode_specdata3(__be32 *p, dev_t *rdev)
{
	unsigned int major, minor;

	major = be32_to_cpup(p++);
	minor = be32_to_cpup(p++);
	*rdev = MKDEV(major, minor);
	if (MAJOR(*rdev) != major || MINOR(*rdev) != minor)
		*rdev = 0;
	return p;
}

/*
 * nfs_fh3
 *
 *	struct nfs_fh3 {
 *		opaque       data<NFS3_FHSIZE>;
 *	};
 */
static void encode_nfs_fh3(struct xdr_stream *xdr, const struct nfs_fh *fh)
{
	__be32 *p;

	WARN_ON_ONCE(fh->size > NFS3_FHSIZE);
	p = xdr_reserve_space(xdr, 4 + fh->size);
	xdr_encode_opaque(p, fh->data, fh->size);
}

static int decode_nfs_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
{
	u32 length;
	__be32 *p;

	p = xdr_inline_decode(xdr, 4);
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	if (unlikely(!p))
		return -EIO;
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	length = be32_to_cpup(p++);
	if (unlikely(length > NFS3_FHSIZE))
		goto out_toobig;
	p = xdr_inline_decode(xdr, length);
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	if (unlikely(!p))
		return -EIO;
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	fh->size = length;
	memcpy(fh->data, p, length);
	return 0;
out_toobig:
	dprintk("NFS: file handle size (%u) too big\n", length);
	return -E2BIG;
}

static void zero_nfs_fh3(struct nfs_fh *fh)
{
	memset(fh, 0, sizeof(*fh));
}

/*
 * nfstime3
 *
 *	struct nfstime3 {
 *		uint32	seconds;
 *		uint32	nseconds;
 *	};
 */
static __be32 *xdr_encode_nfstime3(__be32 *p, const struct timespec *timep)
{
	*p++ = cpu_to_be32(timep->tv_sec);
	*p++ = cpu_to_be32(timep->tv_nsec);
	return p;
}

static __be32 *xdr_decode_nfstime3(__be32 *p, struct timespec *timep)
{
	timep->tv_sec = be32_to_cpup(p++);
	timep->tv_nsec = be32_to_cpup(p++);
	return p;
}

/*
 * sattr3
 *
 *	enum time_how {
 *		DONT_CHANGE		= 0,
 *		SET_TO_SERVER_TIME	= 1,
 *		SET_TO_CLIENT_TIME	= 2
 *	};
 *
 *	union set_mode3 switch (bool set_it) {
 *	case TRUE:
 *		mode3	mode;
 *	default:
 *		void;
 *	};
 *
 *	union set_uid3 switch (bool set_it) {
 *	case TRUE:
 *		uid3	uid;
 *	default:
 *		void;
 *	};
 *
 *	union set_gid3 switch (bool set_it) {
 *	case TRUE:
 *		gid3	gid;
 *	default:
 *		void;
 *	};
 *
 *	union set_size3 switch (bool set_it) {
 *	case TRUE:
 *		size3	size;
 *	default:
 *		void;
 *	};
 *
 *	union set_atime switch (time_how set_it) {
 *	case SET_TO_CLIENT_TIME:
 *		nfstime3	atime;
 *	default:
 *		void;
 *	};
 *
 *	union set_mtime switch (time_how set_it) {
 *	case SET_TO_CLIENT_TIME:
 *		nfstime3  mtime;
 *	default:
 *		void;
 *	};
 *
 *	struct sattr3 {
 *		set_mode3	mode;
 *		set_uid3	uid;
 *		set_gid3	gid;
 *		set_size3	size;
 *		set_atime	atime;
 *		set_mtime	mtime;
 *	};
 */
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static void encode_sattr3(struct xdr_stream *xdr, const struct iattr *attr,
		struct user_namespace *userns)
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{
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	struct timespec ts;
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	u32 nbytes;
	__be32 *p;

	/*
	 * In order to make only a single xdr_reserve_space() call,
	 * pre-compute the total number of bytes to be reserved.
	 * Six boolean values, one for each set_foo field, are always
	 * present in the encoded result, so start there.
	 */
	nbytes = 6 * 4;
	if (attr->ia_valid & ATTR_MODE)
		nbytes += 4;
	if (attr->ia_valid & ATTR_UID)
		nbytes += 4;
	if (attr->ia_valid & ATTR_GID)
		nbytes += 4;
	if (attr->ia_valid & ATTR_SIZE)
		nbytes += 8;
	if (attr->ia_valid & ATTR_ATIME_SET)
		nbytes += 8;
	if (attr->ia_valid & ATTR_MTIME_SET)
		nbytes += 8;
	p = xdr_reserve_space(xdr, nbytes);

	if (attr->ia_valid & ATTR_MODE) {
		*p++ = xdr_one;
		*p++ = cpu_to_be32(attr->ia_mode & S_IALLUGO);
	} else
		*p++ = xdr_zero;

	if (attr->ia_valid & ATTR_UID) {
		*p++ = xdr_one;
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		*p++ = cpu_to_be32(from_kuid_munged(userns, attr->ia_uid));
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	} else
		*p++ = xdr_zero;

	if (attr->ia_valid & ATTR_GID) {
		*p++ = xdr_one;
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		*p++ = cpu_to_be32(from_kgid_munged(userns, attr->ia_gid));
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	} else
		*p++ = xdr_zero;

	if (attr->ia_valid & ATTR_SIZE) {
		*p++ = xdr_one;
		p = xdr_encode_hyper(p, (u64)attr->ia_size);
	} else
		*p++ = xdr_zero;

	if (attr->ia_valid & ATTR_ATIME_SET) {
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		struct timespec ts;
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		*p++ = xdr_two;
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		ts = timespec64_to_timespec(attr->ia_atime);
		p = xdr_encode_nfstime3(p, &ts);
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	} else if (attr->ia_valid & ATTR_ATIME) {
		*p++ = xdr_one;
	} else
		*p++ = xdr_zero;

	if (attr->ia_valid & ATTR_MTIME_SET) {
		*p++ = xdr_two;
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		ts = timespec64_to_timespec(attr->ia_mtime);
		xdr_encode_nfstime3(p, &ts);
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	} else if (attr->ia_valid & ATTR_MTIME) {
		*p = xdr_one;
	} else
		*p = xdr_zero;
}

/*
 * fattr3
 *
 *	struct fattr3 {
 *		ftype3		type;
 *		mode3		mode;
 *		uint32		nlink;
 *		uid3		uid;
 *		gid3		gid;
 *		size3		size;
 *		size3		used;
 *		specdata3	rdev;
 *		uint64		fsid;
 *		fileid3		fileid;
 *		nfstime3	atime;
 *		nfstime3	mtime;
 *		nfstime3	ctime;
 *	};
 */
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static int decode_fattr3(struct xdr_stream *xdr, struct nfs_fattr *fattr,
		struct user_namespace *userns)
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{
	umode_t fmode;
	__be32 *p;

	p = xdr_inline_decode(xdr, NFS3_fattr_sz << 2);
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	if (unlikely(!p))
		return -EIO;
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	p = xdr_decode_ftype3(p, &fmode);

	fattr->mode = (be32_to_cpup(p++) & ~S_IFMT) | fmode;
	fattr->nlink = be32_to_cpup(p++);
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	fattr->uid = make_kuid(userns, be32_to_cpup(p++));
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	if (!uid_valid(fattr->uid))
		goto out_uid;
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	fattr->gid = make_kgid(userns, be32_to_cpup(p++));
642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677
	if (!gid_valid(fattr->gid))
		goto out_gid;

	p = xdr_decode_size3(p, &fattr->size);
	p = xdr_decode_size3(p, &fattr->du.nfs3.used);
	p = xdr_decode_specdata3(p, &fattr->rdev);

	p = xdr_decode_hyper(p, &fattr->fsid.major);
	fattr->fsid.minor = 0;

	p = xdr_decode_fileid3(p, &fattr->fileid);
	p = xdr_decode_nfstime3(p, &fattr->atime);
	p = xdr_decode_nfstime3(p, &fattr->mtime);
	xdr_decode_nfstime3(p, &fattr->ctime);
	fattr->change_attr = nfs_timespec_to_change_attr(&fattr->ctime);

	fattr->valid |= NFS_ATTR_FATTR_V3;
	return 0;
out_uid:
	dprintk("NFS: returned invalid uid\n");
	return -EINVAL;
out_gid:
	dprintk("NFS: returned invalid gid\n");
	return -EINVAL;
}

/*
 * post_op_attr
 *
 *	union post_op_attr switch (bool attributes_follow) {
 *	case TRUE:
 *		fattr3	attributes;
 *	case FALSE:
 *		void;
 *	};
 */
678 679
static int decode_post_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr,
		struct user_namespace *userns)
680 681 682 683
{
	__be32 *p;

	p = xdr_inline_decode(xdr, 4);
684 685
	if (unlikely(!p))
		return -EIO;
686
	if (*p != xdr_zero)
687
		return decode_fattr3(xdr, fattr, userns);
688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703
	return 0;
}

/*
 * wcc_attr
 *	struct wcc_attr {
 *		size3		size;
 *		nfstime3	mtime;
 *		nfstime3	ctime;
 *	};
 */
static int decode_wcc_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
{
	__be32 *p;

	p = xdr_inline_decode(xdr, NFS3_wcc_attr_sz << 2);
704 705
	if (unlikely(!p))
		return -EIO;
706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740

	fattr->valid |= NFS_ATTR_FATTR_PRESIZE
		| NFS_ATTR_FATTR_PRECHANGE
		| NFS_ATTR_FATTR_PREMTIME
		| NFS_ATTR_FATTR_PRECTIME;

	p = xdr_decode_size3(p, &fattr->pre_size);
	p = xdr_decode_nfstime3(p, &fattr->pre_mtime);
	xdr_decode_nfstime3(p, &fattr->pre_ctime);
	fattr->pre_change_attr = nfs_timespec_to_change_attr(&fattr->pre_ctime);

	return 0;
}

/*
 * pre_op_attr
 *	union pre_op_attr switch (bool attributes_follow) {
 *	case TRUE:
 *		wcc_attr	attributes;
 *	case FALSE:
 *		void;
 *	};
 *
 * wcc_data
 *
 *	struct wcc_data {
 *		pre_op_attr	before;
 *		post_op_attr	after;
 *	};
 */
static int decode_pre_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
{
	__be32 *p;

	p = xdr_inline_decode(xdr, 4);
741 742
	if (unlikely(!p))
		return -EIO;
743 744 745 746 747
	if (*p != xdr_zero)
		return decode_wcc_attr(xdr, fattr);
	return 0;
}

748 749
static int decode_wcc_data(struct xdr_stream *xdr, struct nfs_fattr *fattr,
		struct user_namespace *userns)
750 751 752 753 754 755
{
	int error;

	error = decode_pre_op_attr(xdr, fattr);
	if (unlikely(error))
		goto out;
756
	error = decode_post_op_attr(xdr, fattr, userns);
757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773
out:
	return error;
}

/*
 * post_op_fh3
 *
 *	union post_op_fh3 switch (bool handle_follows) {
 *	case TRUE:
 *		nfs_fh3  handle;
 *	case FALSE:
 *		void;
 *	};
 */
static int decode_post_op_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
{
	__be32 *p = xdr_inline_decode(xdr, 4);
774 775
	if (unlikely(!p))
		return -EIO;
776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813
	if (*p != xdr_zero)
		return decode_nfs_fh3(xdr, fh);
	zero_nfs_fh3(fh);
	return 0;
}

/*
 * diropargs3
 *
 *	struct diropargs3 {
 *		nfs_fh3		dir;
 *		filename3	name;
 *	};
 */
static void encode_diropargs3(struct xdr_stream *xdr, const struct nfs_fh *fh,
			      const char *name, u32 length)
{
	encode_nfs_fh3(xdr, fh);
	encode_filename3(xdr, name, length);
}


/*
 * NFSv3 XDR encode functions
 *
 * NFSv3 argument types are defined in section 3.3 of RFC 1813:
 * "NFS Version 3 Protocol Specification".
 */

/*
 * 3.3.1  GETATTR3args
 *
 *	struct GETATTR3args {
 *		nfs_fh3  object;
 *	};
 */
static void nfs3_xdr_enc_getattr3args(struct rpc_rqst *req,
				      struct xdr_stream *xdr,
814
				      const void *data)
815
{
816 817
	const struct nfs_fh *fh = data;

818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853
	encode_nfs_fh3(xdr, fh);
}

/*
 * 3.3.2  SETATTR3args
 *
 *	union sattrguard3 switch (bool check) {
 *	case TRUE:
 *		nfstime3  obj_ctime;
 *	case FALSE:
 *		void;
 *	};
 *
 *	struct SETATTR3args {
 *		nfs_fh3		object;
 *		sattr3		new_attributes;
 *		sattrguard3	guard;
 *	};
 */
static void encode_sattrguard3(struct xdr_stream *xdr,
			       const struct nfs3_sattrargs *args)
{
	__be32 *p;

	if (args->guard) {
		p = xdr_reserve_space(xdr, 4 + 8);
		*p++ = xdr_one;
		xdr_encode_nfstime3(p, &args->guardtime);
	} else {
		p = xdr_reserve_space(xdr, 4);
		*p = xdr_zero;
	}
}

static void nfs3_xdr_enc_setattr3args(struct rpc_rqst *req,
				      struct xdr_stream *xdr,
854
				      const void *data)
855
{
856
	const struct nfs3_sattrargs *args = data;
857
	encode_nfs_fh3(xdr, args->fh);
858
	encode_sattr3(xdr, args->sattr, rpc_rqst_userns(req));
859 860 861 862 863 864 865 866 867 868 869 870
	encode_sattrguard3(xdr, args);
}

/*
 * 3.3.3  LOOKUP3args
 *
 *	struct LOOKUP3args {
 *		diropargs3  what;
 *	};
 */
static void nfs3_xdr_enc_lookup3args(struct rpc_rqst *req,
				     struct xdr_stream *xdr,
871
				     const void *data)
872
{
873 874
	const struct nfs3_diropargs *args = data;

875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894
	encode_diropargs3(xdr, args->fh, args->name, args->len);
}

/*
 * 3.3.4  ACCESS3args
 *
 *	struct ACCESS3args {
 *		nfs_fh3		object;
 *		uint32		access;
 *	};
 */
static void encode_access3args(struct xdr_stream *xdr,
			       const struct nfs3_accessargs *args)
{
	encode_nfs_fh3(xdr, args->fh);
	encode_uint32(xdr, args->access);
}

static void nfs3_xdr_enc_access3args(struct rpc_rqst *req,
				     struct xdr_stream *xdr,
895
				     const void *data)
896
{
897 898
	const struct nfs3_accessargs *args = data;

899 900 901 902 903 904 905 906 907 908 909 910
	encode_access3args(xdr, args);
}

/*
 * 3.3.5  READLINK3args
 *
 *	struct READLINK3args {
 *		nfs_fh3	symlink;
 *	};
 */
static void nfs3_xdr_enc_readlink3args(struct rpc_rqst *req,
				       struct xdr_stream *xdr,
911
				       const void *data)
912
{
913 914
	const struct nfs3_readlinkargs *args = data;

915
	encode_nfs_fh3(xdr, args->fh);
916 917
	rpc_prepare_reply_pages(req, args->pages, args->pgbase,
				args->pglen, NFS3_readlinkres_sz);
918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942
}

/*
 * 3.3.6  READ3args
 *
 *	struct READ3args {
 *		nfs_fh3		file;
 *		offset3		offset;
 *		count3		count;
 *	};
 */
static void encode_read3args(struct xdr_stream *xdr,
			     const struct nfs_pgio_args *args)
{
	__be32 *p;

	encode_nfs_fh3(xdr, args->fh);

	p = xdr_reserve_space(xdr, 8 + 4);
	p = xdr_encode_hyper(p, args->offset);
	*p = cpu_to_be32(args->count);
}

static void nfs3_xdr_enc_read3args(struct rpc_rqst *req,
				   struct xdr_stream *xdr,
943
				   const void *data)
944
{
945
	const struct nfs_pgio_args *args = data;
946
	unsigned int replen = args->replen ? args->replen : NFS3_readres_sz;
947

948
	encode_read3args(xdr, args);
949 950
	rpc_prepare_reply_pages(req, args->pages, args->pgbase,
				args->count, replen);
951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987
	req->rq_rcv_buf.flags |= XDRBUF_READ;
}

/*
 * 3.3.7  WRITE3args
 *
 *	enum stable_how {
 *		UNSTABLE  = 0,
 *		DATA_SYNC = 1,
 *		FILE_SYNC = 2
 *	};
 *
 *	struct WRITE3args {
 *		nfs_fh3		file;
 *		offset3		offset;
 *		count3		count;
 *		stable_how	stable;
 *		opaque		data<>;
 *	};
 */
static void encode_write3args(struct xdr_stream *xdr,
			      const struct nfs_pgio_args *args)
{
	__be32 *p;

	encode_nfs_fh3(xdr, args->fh);

	p = xdr_reserve_space(xdr, 8 + 4 + 4 + 4);
	p = xdr_encode_hyper(p, args->offset);
	*p++ = cpu_to_be32(args->count);
	*p++ = cpu_to_be32(args->stable);
	*p = cpu_to_be32(args->count);
	xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
}

static void nfs3_xdr_enc_write3args(struct rpc_rqst *req,
				    struct xdr_stream *xdr,
988
				    const void *data)
989
{
990 991
	const struct nfs_pgio_args *args = data;

992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018
	encode_write3args(xdr, args);
	xdr->buf->flags |= XDRBUF_WRITE;
}

/*
 * 3.3.8  CREATE3args
 *
 *	enum createmode3 {
 *		UNCHECKED = 0,
 *		GUARDED   = 1,
 *		EXCLUSIVE = 2
 *	};
 *
 *	union createhow3 switch (createmode3 mode) {
 *	case UNCHECKED:
 *	case GUARDED:
 *		sattr3       obj_attributes;
 *	case EXCLUSIVE:
 *		createverf3  verf;
 *	};
 *
 *	struct CREATE3args {
 *		diropargs3	where;
 *		createhow3	how;
 *	};
 */
static void encode_createhow3(struct xdr_stream *xdr,
1019 1020
			      const struct nfs3_createargs *args,
			      struct user_namespace *userns)
1021 1022 1023 1024 1025
{
	encode_uint32(xdr, args->createmode);
	switch (args->createmode) {
	case NFS3_CREATE_UNCHECKED:
	case NFS3_CREATE_GUARDED:
1026
		encode_sattr3(xdr, args->sattr, userns);
1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037
		break;
	case NFS3_CREATE_EXCLUSIVE:
		encode_createverf3(xdr, args->verifier);
		break;
	default:
		BUG();
	}
}

static void nfs3_xdr_enc_create3args(struct rpc_rqst *req,
				     struct xdr_stream *xdr,
1038
				     const void *data)
1039
{
1040 1041
	const struct nfs3_createargs *args = data;

1042
	encode_diropargs3(xdr, args->fh, args->name, args->len);
1043
	encode_createhow3(xdr, args, rpc_rqst_userns(req));
1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055
}

/*
 * 3.3.9  MKDIR3args
 *
 *	struct MKDIR3args {
 *		diropargs3	where;
 *		sattr3		attributes;
 *	};
 */
static void nfs3_xdr_enc_mkdir3args(struct rpc_rqst *req,
				    struct xdr_stream *xdr,
1056
				    const void *data)
1057
{
1058 1059
	const struct nfs3_mkdirargs *args = data;

1060
	encode_diropargs3(xdr, args->fh, args->name, args->len);
1061
	encode_sattr3(xdr, args->sattr, rpc_rqst_userns(req));
1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077
}

/*
 * 3.3.10  SYMLINK3args
 *
 *	struct symlinkdata3 {
 *		sattr3		symlink_attributes;
 *		nfspath3	symlink_data;
 *	};
 *
 *	struct SYMLINK3args {
 *		diropargs3	where;
 *		symlinkdata3	symlink;
 *	};
 */
static void encode_symlinkdata3(struct xdr_stream *xdr,
1078 1079
				const void *data,
				struct user_namespace *userns)
1080
{
1081 1082
	const struct nfs3_symlinkargs *args = data;

1083
	encode_sattr3(xdr, args->sattr, userns);
1084 1085 1086 1087 1088
	encode_nfspath3(xdr, args->pages, args->pathlen);
}

static void nfs3_xdr_enc_symlink3args(struct rpc_rqst *req,
				      struct xdr_stream *xdr,
1089
				      const void *data)
1090
{
1091 1092
	const struct nfs3_symlinkargs *args = data;

1093
	encode_diropargs3(xdr, args->fromfh, args->fromname, args->fromlen);
1094
	encode_symlinkdata3(xdr, args, rpc_rqst_userns(req));
1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122
	xdr->buf->flags |= XDRBUF_WRITE;
}

/*
 * 3.3.11  MKNOD3args
 *
 *	struct devicedata3 {
 *		sattr3		dev_attributes;
 *		specdata3	spec;
 *	};
 *
 *	union mknoddata3 switch (ftype3 type) {
 *	case NF3CHR:
 *	case NF3BLK:
 *		devicedata3	device;
 *	case NF3SOCK:
 *	case NF3FIFO:
 *		sattr3		pipe_attributes;
 *	default:
 *		void;
 *	};
 *
 *	struct MKNOD3args {
 *		diropargs3	where;
 *		mknoddata3	what;
 *	};
 */
static void encode_devicedata3(struct xdr_stream *xdr,
1123 1124
			       const struct nfs3_mknodargs *args,
			       struct user_namespace *userns)
1125
{
1126
	encode_sattr3(xdr, args->sattr, userns);
1127 1128 1129 1130
	encode_specdata3(xdr, args->rdev);
}

static void encode_mknoddata3(struct xdr_stream *xdr,
1131 1132
			      const struct nfs3_mknodargs *args,
			      struct user_namespace *userns)
1133 1134 1135 1136 1137
{
	encode_ftype3(xdr, args->type);
	switch (args->type) {
	case NF3CHR:
	case NF3BLK:
1138
		encode_devicedata3(xdr, args, userns);
1139 1140 1141
		break;
	case NF3SOCK:
	case NF3FIFO:
1142
		encode_sattr3(xdr, args->sattr, userns);
1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153
		break;
	case NF3REG:
	case NF3DIR:
		break;
	default:
		BUG();
	}
}

static void nfs3_xdr_enc_mknod3args(struct rpc_rqst *req,
				    struct xdr_stream *xdr,
1154
				    const void *data)
1155
{
1156 1157
	const struct nfs3_mknodargs *args = data;

1158
	encode_diropargs3(xdr, args->fh, args->name, args->len);
1159
	encode_mknoddata3(xdr, args, rpc_rqst_userns(req));
1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170
}

/*
 * 3.3.12  REMOVE3args
 *
 *	struct REMOVE3args {
 *		diropargs3  object;
 *	};
 */
static void nfs3_xdr_enc_remove3args(struct rpc_rqst *req,
				     struct xdr_stream *xdr,
1171
				     const void *data)
1172
{
1173 1174
	const struct nfs_removeargs *args = data;

1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187
	encode_diropargs3(xdr, args->fh, args->name.name, args->name.len);
}

/*
 * 3.3.14  RENAME3args
 *
 *	struct RENAME3args {
 *		diropargs3	from;
 *		diropargs3	to;
 *	};
 */
static void nfs3_xdr_enc_rename3args(struct rpc_rqst *req,
				     struct xdr_stream *xdr,
1188
				     const void *data)
1189
{
1190
	const struct nfs_renameargs *args = data;
1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207
	const struct qstr *old = args->old_name;
	const struct qstr *new = args->new_name;

	encode_diropargs3(xdr, args->old_dir, old->name, old->len);
	encode_diropargs3(xdr, args->new_dir, new->name, new->len);
}

/*
 * 3.3.15  LINK3args
 *
 *	struct LINK3args {
 *		nfs_fh3		file;
 *		diropargs3	link;
 *	};
 */
static void nfs3_xdr_enc_link3args(struct rpc_rqst *req,
				   struct xdr_stream *xdr,
1208
				   const void *data)
1209
{
1210 1211
	const struct nfs3_linkargs *args = data;

1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240
	encode_nfs_fh3(xdr, args->fromfh);
	encode_diropargs3(xdr, args->tofh, args->toname, args->tolen);
}

/*
 * 3.3.16  READDIR3args
 *
 *	struct READDIR3args {
 *		nfs_fh3		dir;
 *		cookie3		cookie;
 *		cookieverf3	cookieverf;
 *		count3		count;
 *	};
 */
static void encode_readdir3args(struct xdr_stream *xdr,
				const struct nfs3_readdirargs *args)
{
	__be32 *p;

	encode_nfs_fh3(xdr, args->fh);

	p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4);
	p = xdr_encode_cookie3(p, args->cookie);
	p = xdr_encode_cookieverf3(p, args->verf);
	*p = cpu_to_be32(args->count);
}

static void nfs3_xdr_enc_readdir3args(struct rpc_rqst *req,
				      struct xdr_stream *xdr,
1241
				      const void *data)
1242
{
1243 1244
	const struct nfs3_readdirargs *args = data;

1245
	encode_readdir3args(xdr, args);
1246
	rpc_prepare_reply_pages(req, args->pages, 0,
1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282
				args->count, NFS3_readdirres_sz);
}

/*
 * 3.3.17  READDIRPLUS3args
 *
 *	struct READDIRPLUS3args {
 *		nfs_fh3		dir;
 *		cookie3		cookie;
 *		cookieverf3	cookieverf;
 *		count3		dircount;
 *		count3		maxcount;
 *	};
 */
static void encode_readdirplus3args(struct xdr_stream *xdr,
				    const struct nfs3_readdirargs *args)
{
	__be32 *p;

	encode_nfs_fh3(xdr, args->fh);

	p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4 + 4);
	p = xdr_encode_cookie3(p, args->cookie);
	p = xdr_encode_cookieverf3(p, args->verf);

	/*
	 * readdirplus: need dircount + buffer size.
	 * We just make sure we make dircount big enough
	 */
	*p++ = cpu_to_be32(args->count >> 3);

	*p = cpu_to_be32(args->count);
}

static void nfs3_xdr_enc_readdirplus3args(struct rpc_rqst *req,
					  struct xdr_stream *xdr,
1283
					  const void *data)
1284
{
1285 1286
	const struct nfs3_readdirargs *args = data;

1287
	encode_readdirplus3args(xdr, args);
1288
	rpc_prepare_reply_pages(req, args->pages, 0,
1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314
				args->count, NFS3_readdirres_sz);
}

/*
 * 3.3.21  COMMIT3args
 *
 *	struct COMMIT3args {
 *		nfs_fh3		file;
 *		offset3		offset;
 *		count3		count;
 *	};
 */
static void encode_commit3args(struct xdr_stream *xdr,
			       const struct nfs_commitargs *args)
{
	__be32 *p;

	encode_nfs_fh3(xdr, args->fh);

	p = xdr_reserve_space(xdr, 8 + 4);
	p = xdr_encode_hyper(p, args->offset);
	*p = cpu_to_be32(args->count);
}

static void nfs3_xdr_enc_commit3args(struct rpc_rqst *req,
				     struct xdr_stream *xdr,
1315
				     const void *data)
1316
{
1317 1318
	const struct nfs_commitargs *args = data;

1319 1320 1321 1322 1323 1324 1325
	encode_commit3args(xdr, args);
}

#ifdef CONFIG_NFS_V3_ACL

static void nfs3_xdr_enc_getacl3args(struct rpc_rqst *req,
				     struct xdr_stream *xdr,
1326
				     const void *data)
1327
{
1328 1329
	const struct nfs3_getaclargs *args = data;

1330 1331
	encode_nfs_fh3(xdr, args->fh);
	encode_uint32(xdr, args->mask);
1332 1333
	if (args->mask & (NFS_ACL | NFS_DFACL)) {
		rpc_prepare_reply_pages(req, args->pages, 0,
1334 1335
					NFSACL_MAXPAGES << PAGE_SHIFT,
					ACL3_getaclres_sz);
1336 1337
		req->rq_rcv_buf.flags |= XDRBUF_SPARSE_PAGES;
	}
1338 1339 1340 1341
}

static void nfs3_xdr_enc_setacl3args(struct rpc_rqst *req,
				     struct xdr_stream *xdr,
1342
				     const void *data)
1343
{
1344
	const struct nfs3_setaclargs *args = data;
1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393
	unsigned int base;
	int error;

	encode_nfs_fh3(xdr, NFS_FH(args->inode));
	encode_uint32(xdr, args->mask);

	base = req->rq_slen;
	if (args->npages != 0)
		xdr_write_pages(xdr, args->pages, 0, args->len);
	else
		xdr_reserve_space(xdr, args->len);

	error = nfsacl_encode(xdr->buf, base, args->inode,
			    (args->mask & NFS_ACL) ?
			    args->acl_access : NULL, 1, 0);
	/* FIXME: this is just broken */
	BUG_ON(error < 0);
	error = nfsacl_encode(xdr->buf, base + error, args->inode,
			    (args->mask & NFS_DFACL) ?
			    args->acl_default : NULL, 1,
			    NFS_ACL_DEFAULT);
	BUG_ON(error < 0);
}

#endif  /* CONFIG_NFS_V3_ACL */

/*
 * NFSv3 XDR decode functions
 *
 * NFSv3 result types are defined in section 3.3 of RFC 1813:
 * "NFS Version 3 Protocol Specification".
 */

/*
 * 3.3.1  GETATTR3res
 *
 *	struct GETATTR3resok {
 *		fattr3		obj_attributes;
 *	};
 *
 *	union GETATTR3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		GETATTR3resok  resok;
 *	default:
 *		void;
 *	};
 */
static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req,
				    struct xdr_stream *xdr,
1394
				    void *result)
1395 1396 1397 1398 1399 1400 1401 1402 1403
{
	enum nfs_stat status;
	int error;

	error = decode_nfsstat3(xdr, &status);
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_default;
1404
	error = decode_fattr3(xdr, result, rpc_rqst_userns(req));
1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430
out:
	return error;
out_default:
	return nfs3_stat_to_errno(status);
}

/*
 * 3.3.2  SETATTR3res
 *
 *	struct SETATTR3resok {
 *		wcc_data  obj_wcc;
 *	};
 *
 *	struct SETATTR3resfail {
 *		wcc_data  obj_wcc;
 *	};
 *
 *	union SETATTR3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		SETATTR3resok   resok;
 *	default:
 *		SETATTR3resfail resfail;
 *	};
 */
static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req,
				    struct xdr_stream *xdr,
1431
				    void *result)
1432 1433 1434 1435 1436 1437 1438
{
	enum nfs_stat status;
	int error;

	error = decode_nfsstat3(xdr, &status);
	if (unlikely(error))
		goto out;
1439
	error = decode_wcc_data(xdr, result, rpc_rqst_userns(req));
1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_status;
out:
	return error;
out_status:
	return nfs3_stat_to_errno(status);
}

/*
 * 3.3.3  LOOKUP3res
 *
 *	struct LOOKUP3resok {
 *		nfs_fh3		object;
 *		post_op_attr	obj_attributes;
 *		post_op_attr	dir_attributes;
 *	};
 *
 *	struct LOOKUP3resfail {
 *		post_op_attr	dir_attributes;
 *	};
 *
 *	union LOOKUP3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		LOOKUP3resok	resok;
 *	default:
 *		LOOKUP3resfail	resfail;
 *	};
 */
static int nfs3_xdr_dec_lookup3res(struct rpc_rqst *req,
				   struct xdr_stream *xdr,
1472
				   void *data)
1473
{
1474
	struct user_namespace *userns = rpc_rqst_userns(req);
1475
	struct nfs3_diropres *result = data;
1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486
	enum nfs_stat status;
	int error;

	error = decode_nfsstat3(xdr, &status);
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_default;
	error = decode_nfs_fh3(xdr, result->fh);
	if (unlikely(error))
		goto out;
1487
	error = decode_post_op_attr(xdr, result->fattr, userns);
1488 1489
	if (unlikely(error))
		goto out;
1490
	error = decode_post_op_attr(xdr, result->dir_attr, userns);
1491 1492 1493
out:
	return error;
out_default:
1494
	error = decode_post_op_attr(xdr, result->dir_attr, userns);
1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520
	if (unlikely(error))
		goto out;
	return nfs3_stat_to_errno(status);
}

/*
 * 3.3.4  ACCESS3res
 *
 *	struct ACCESS3resok {
 *		post_op_attr	obj_attributes;
 *		uint32		access;
 *	};
 *
 *	struct ACCESS3resfail {
 *		post_op_attr	obj_attributes;
 *	};
 *
 *	union ACCESS3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		ACCESS3resok	resok;
 *	default:
 *		ACCESS3resfail	resfail;
 *	};
 */
static int nfs3_xdr_dec_access3res(struct rpc_rqst *req,
				   struct xdr_stream *xdr,
1521
				   void *data)
1522
{
1523
	struct nfs3_accessres *result = data;
1524 1525 1526 1527 1528 1529
	enum nfs_stat status;
	int error;

	error = decode_nfsstat3(xdr, &status);
	if (unlikely(error))
		goto out;
1530
	error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req));
1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_default;
	error = decode_uint32(xdr, &result->access);
out:
	return error;
out_default:
	return nfs3_stat_to_errno(status);
}

/*
 * 3.3.5  READLINK3res
 *
 *	struct READLINK3resok {
 *		post_op_attr	symlink_attributes;
 *		nfspath3	data;
 *	};
 *
 *	struct READLINK3resfail {
 *		post_op_attr	symlink_attributes;
 *	};
 *
 *	union READLINK3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		READLINK3resok	resok;
 *	default:
 *		READLINK3resfail resfail;
 *	};
 */
static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req,
				     struct xdr_stream *xdr,
1563
				     void *result)
1564 1565 1566 1567 1568 1569 1570
{
	enum nfs_stat status;
	int error;

	error = decode_nfsstat3(xdr, &status);
	if (unlikely(error))
		goto out;
1571
	error = decode_post_op_attr(xdr, result, rpc_rqst_userns(req));
1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_default;
	error = decode_nfspath3(xdr);
out:
	return error;
out_default:
	return nfs3_stat_to_errno(status);
}

/*
 * 3.3.6  READ3res
 *
 *	struct READ3resok {
 *		post_op_attr	file_attributes;
 *		count3		count;
 *		bool		eof;
 *		opaque		data<>;
 *	};
 *
 *	struct READ3resfail {
 *		post_op_attr	file_attributes;
 *	};
 *
 *	union READ3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		READ3resok	resok;
 *	default:
 *		READ3resfail	resfail;
 *	};
 */
static int decode_read3resok(struct xdr_stream *xdr,
			     struct nfs_pgio_res *result)
{
	u32 eof, count, ocount, recvd;
	__be32 *p;

	p = xdr_inline_decode(xdr, 4 + 4 + 4);
1611 1612
	if (unlikely(!p))
		return -EIO;
1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637
	count = be32_to_cpup(p++);
	eof = be32_to_cpup(p++);
	ocount = be32_to_cpup(p++);
	if (unlikely(ocount != count))
		goto out_mismatch;
	recvd = xdr_read_pages(xdr, count);
	if (unlikely(count > recvd))
		goto out_cheating;
out:
	result->eof = eof;
	result->count = count;
	return count;
out_mismatch:
	dprintk("NFS: READ count doesn't match length of opaque: "
		"count %u != ocount %u\n", count, ocount);
	return -EIO;
out_cheating:
	dprintk("NFS: server cheating in read result: "
		"count %u > recvd %u\n", count, recvd);
	count = recvd;
	eof = 0;
	goto out;
}

static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1638
				 void *data)
1639
{
1640
	struct nfs_pgio_res *result = data;
1641
	unsigned int pos;
1642 1643 1644
	enum nfs_stat status;
	int error;

1645
	pos = xdr_stream_pos(xdr);
1646 1647 1648
	error = decode_nfsstat3(xdr, &status);
	if (unlikely(error))
		goto out;
1649
	error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req));
1650 1651 1652 1653 1654
	if (unlikely(error))
		goto out;
	result->op_status = status;
	if (status != NFS3_OK)
		goto out_status;
1655
	result->replen = 4 + ((xdr_stream_pos(xdr) - pos) >> 2);
1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695
	error = decode_read3resok(xdr, result);
out:
	return error;
out_status:
	return nfs3_stat_to_errno(status);
}

/*
 * 3.3.7  WRITE3res
 *
 *	enum stable_how {
 *		UNSTABLE  = 0,
 *		DATA_SYNC = 1,
 *		FILE_SYNC = 2
 *	};
 *
 *	struct WRITE3resok {
 *		wcc_data	file_wcc;
 *		count3		count;
 *		stable_how	committed;
 *		writeverf3	verf;
 *	};
 *
 *	struct WRITE3resfail {
 *		wcc_data	file_wcc;
 *	};
 *
 *	union WRITE3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		WRITE3resok	resok;
 *	default:
 *		WRITE3resfail	resfail;
 *	};
 */
static int decode_write3resok(struct xdr_stream *xdr,
			      struct nfs_pgio_res *result)
{
	__be32 *p;

	p = xdr_inline_decode(xdr, 4 + 4);
1696 1697
	if (unlikely(!p))
		return -EIO;
1698 1699 1700 1701 1702
	result->count = be32_to_cpup(p++);
	result->verf->committed = be32_to_cpup(p++);
	if (unlikely(result->verf->committed > NFS_FILE_SYNC))
		goto out_badvalue;
	if (decode_writeverf3(xdr, &result->verf->verifier))
1703
		return -EIO;
1704 1705 1706 1707 1708 1709 1710
	return result->count;
out_badvalue:
	dprintk("NFS: bad stable_how value: %u\n", result->verf->committed);
	return -EIO;
}

static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1711
				  void *data)
1712
{
1713
	struct nfs_pgio_res *result = data;
1714 1715 1716 1717 1718 1719
	enum nfs_stat status;
	int error;

	error = decode_nfsstat3(xdr, &status);
	if (unlikely(error))
		goto out;
1720
	error = decode_wcc_data(xdr, result->fattr, rpc_rqst_userns(req));
1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753
	if (unlikely(error))
		goto out;
	result->op_status = status;
	if (status != NFS3_OK)
		goto out_status;
	error = decode_write3resok(xdr, result);
out:
	return error;
out_status:
	return nfs3_stat_to_errno(status);
}

/*
 * 3.3.8  CREATE3res
 *
 *	struct CREATE3resok {
 *		post_op_fh3	obj;
 *		post_op_attr	obj_attributes;
 *		wcc_data	dir_wcc;
 *	};
 *
 *	struct CREATE3resfail {
 *		wcc_data	dir_wcc;
 *	};
 *
 *	union CREATE3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		CREATE3resok	resok;
 *	default:
 *		CREATE3resfail	resfail;
 *	};
 */
static int decode_create3resok(struct xdr_stream *xdr,
1754 1755
			       struct nfs3_diropres *result,
			       struct user_namespace *userns)
1756 1757 1758 1759 1760 1761
{
	int error;

	error = decode_post_op_fh3(xdr, result->fh);
	if (unlikely(error))
		goto out;
1762
	error = decode_post_op_attr(xdr, result->fattr, userns);
1763 1764 1765 1766 1767 1768 1769 1770
	if (unlikely(error))
		goto out;
	/* The server isn't required to return a file handle.
	 * If it didn't, force the client to perform a LOOKUP
	 * to determine the correct file handle and attribute
	 * values for the new object. */
	if (result->fh->size == 0)
		result->fattr->valid = 0;
1771
	error = decode_wcc_data(xdr, result->dir_attr, userns);
1772 1773 1774 1775 1776 1777
out:
	return error;
}

static int nfs3_xdr_dec_create3res(struct rpc_rqst *req,
				   struct xdr_stream *xdr,
1778
				   void *data)
1779
{
1780
	struct user_namespace *userns = rpc_rqst_userns(req);
1781
	struct nfs3_diropres *result = data;
1782 1783 1784 1785 1786 1787 1788 1789
	enum nfs_stat status;
	int error;

	error = decode_nfsstat3(xdr, &status);
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_default;
1790
	error = decode_create3resok(xdr, result, userns);
1791 1792 1793
out:
	return error;
out_default:
1794
	error = decode_wcc_data(xdr, result->dir_attr, userns);
1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819
	if (unlikely(error))
		goto out;
	return nfs3_stat_to_errno(status);
}

/*
 * 3.3.12  REMOVE3res
 *
 *	struct REMOVE3resok {
 *		wcc_data    dir_wcc;
 *	};
 *
 *	struct REMOVE3resfail {
 *		wcc_data    dir_wcc;
 *	};
 *
 *	union REMOVE3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		REMOVE3resok   resok;
 *	default:
 *		REMOVE3resfail resfail;
 *	};
 */
static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req,
				   struct xdr_stream *xdr,
1820
				   void *data)
1821
{
1822
	struct nfs_removeres *result = data;
1823 1824 1825 1826 1827 1828
	enum nfs_stat status;
	int error;

	error = decode_nfsstat3(xdr, &status);
	if (unlikely(error))
		goto out;
1829
	error = decode_wcc_data(xdr, result->dir_attr, rpc_rqst_userns(req));
1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_status;
out:
	return error;
out_status:
	return nfs3_stat_to_errno(status);
}

/*
 * 3.3.14  RENAME3res
 *
 *	struct RENAME3resok {
 *		wcc_data	fromdir_wcc;
 *		wcc_data	todir_wcc;
 *	};
 *
 *	struct RENAME3resfail {
 *		wcc_data	fromdir_wcc;
 *		wcc_data	todir_wcc;
 *	};
 *
 *	union RENAME3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		RENAME3resok   resok;
 *	default:
 *		RENAME3resfail resfail;
 *	};
 */
static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req,
				   struct xdr_stream *xdr,
1862
				   void *data)
1863
{
1864
	struct user_namespace *userns = rpc_rqst_userns(req);
1865
	struct nfs_renameres *result = data;
1866 1867 1868 1869 1870 1871
	enum nfs_stat status;
	int error;

	error = decode_nfsstat3(xdr, &status);
	if (unlikely(error))
		goto out;
1872
	error = decode_wcc_data(xdr, result->old_fattr, userns);
1873 1874
	if (unlikely(error))
		goto out;
1875
	error = decode_wcc_data(xdr, result->new_fattr, userns);
1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_status;
out:
	return error;
out_status:
	return nfs3_stat_to_errno(status);
}

/*
 * 3.3.15  LINK3res
 *
 *	struct LINK3resok {
 *		post_op_attr	file_attributes;
 *		wcc_data	linkdir_wcc;
 *	};
 *
 *	struct LINK3resfail {
 *		post_op_attr	file_attributes;
 *		wcc_data	linkdir_wcc;
 *	};
 *
 *	union LINK3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		LINK3resok	resok;
 *	default:
 *		LINK3resfail	resfail;
 *	};
 */
static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1907
				 void *data)
1908
{
1909
	struct user_namespace *userns = rpc_rqst_userns(req);
1910
	struct nfs3_linkres *result = data;
1911 1912 1913 1914 1915 1916
	enum nfs_stat status;
	int error;

	error = decode_nfsstat3(xdr, &status);
	if (unlikely(error))
		goto out;
1917
	error = decode_post_op_attr(xdr, result->fattr, userns);
1918 1919
	if (unlikely(error))
		goto out;
1920
	error = decode_wcc_data(xdr, result->dir_attr, userns);
1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_status;
out:
	return error;
out_status:
	return nfs3_stat_to_errno(status);
}

/**
 * nfs3_decode_dirent - Decode a single NFSv3 directory entry stored in
 *			the local page cache
 * @xdr: XDR stream where entry resides
 * @entry: buffer to fill in with entry data
 * @plus: boolean indicating whether this should be a readdirplus entry
 *
 * Returns zero if successful, otherwise a negative errno value is
 * returned.
 *
 * This function is not invoked during READDIR reply decoding, but
 * rather whenever an application invokes the getdents(2) system call
 * on a directory already in our cache.
 *
 * 3.3.16  entry3
 *
 *	struct entry3 {
 *		fileid3		fileid;
 *		filename3	name;
 *		cookie3		cookie;
 *		fhandle3	filehandle;
 *		post_op_attr3	attributes;
 *		entry3		*nextentry;
 *	};
 *
 * 3.3.17  entryplus3
 *	struct entryplus3 {
 *		fileid3		fileid;
 *		filename3	name;
 *		cookie3		cookie;
 *		post_op_attr	name_attributes;
 *		post_op_fh3	name_handle;
 *		entryplus3	*nextentry;
 *	};
 */
int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
1967
		       bool plus)
1968
{
1969
	struct user_namespace *userns = rpc_userns(entry->server->client);
1970 1971 1972
	struct nfs_entry old = *entry;
	__be32 *p;
	int error;
1973
	u64 new_cookie;
1974 1975

	p = xdr_inline_decode(xdr, 4);
1976 1977
	if (unlikely(!p))
		return -EAGAIN;
1978 1979
	if (*p == xdr_zero) {
		p = xdr_inline_decode(xdr, 4);
1980 1981
		if (unlikely(!p))
			return -EAGAIN;
1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995
		if (*p == xdr_zero)
			return -EAGAIN;
		entry->eof = 1;
		return -EBADCOOKIE;
	}

	error = decode_fileid3(xdr, &entry->ino);
	if (unlikely(error))
		return error;

	error = decode_inline_filename3(xdr, &entry->name, &entry->len);
	if (unlikely(error))
		return error;

1996
	error = decode_cookie3(xdr, &new_cookie);
1997 1998 1999 2000 2001 2002 2003
	if (unlikely(error))
		return error;

	entry->d_type = DT_UNKNOWN;

	if (plus) {
		entry->fattr->valid = 0;
2004
		error = decode_post_op_attr(xdr, entry->fattr, userns);
2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016
		if (unlikely(error))
			return error;
		if (entry->fattr->valid & NFS_ATTR_FATTR_V3)
			entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);

		if (entry->fattr->fileid != entry->ino) {
			entry->fattr->mounted_on_fileid = entry->ino;
			entry->fattr->valid |= NFS_ATTR_FATTR_MOUNTED_ON_FILEID;
		}

		/* In fact, a post_op_fh3: */
		p = xdr_inline_decode(xdr, 4);
2017 2018
		if (unlikely(!p))
			return -EAGAIN;
2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029
		if (*p != xdr_zero) {
			error = decode_nfs_fh3(xdr, entry->fh);
			if (unlikely(error)) {
				if (error == -E2BIG)
					goto out_truncated;
				return error;
			}
		} else
			zero_nfs_fh3(entry->fh);
	}

2030 2031 2032
	entry->prev_cookie = entry->cookie;
	entry->cookie = new_cookie;

2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075
	return 0;

out_truncated:
	dprintk("NFS: directory entry contains invalid file handle\n");
	*entry = old;
	return -EAGAIN;
}

/*
 * 3.3.16  READDIR3res
 *
 *	struct dirlist3 {
 *		entry3		*entries;
 *		bool		eof;
 *	};
 *
 *	struct READDIR3resok {
 *		post_op_attr	dir_attributes;
 *		cookieverf3	cookieverf;
 *		dirlist3	reply;
 *	};
 *
 *	struct READDIR3resfail {
 *		post_op_attr	dir_attributes;
 *	};
 *
 *	union READDIR3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		READDIR3resok	resok;
 *	default:
 *		READDIR3resfail	resfail;
 *	};
 *
 * Read the directory contents into the page cache, but otherwise
 * don't touch them.  The actual decoding is done by nfs3_decode_entry()
 * during subsequent nfs_readdir() calls.
 */
static int decode_dirlist3(struct xdr_stream *xdr)
{
	return xdr_read_pages(xdr, xdr->buf->page_len);
}

static int decode_readdir3resok(struct xdr_stream *xdr,
2076 2077
				struct nfs3_readdirres *result,
				struct user_namespace *userns)
2078 2079 2080
{
	int error;

2081
	error = decode_post_op_attr(xdr, result->dir_attr, userns);
2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094
	if (unlikely(error))
		goto out;
	/* XXX: do we need to check if result->verf != NULL ? */
	error = decode_cookieverf3(xdr, result->verf);
	if (unlikely(error))
		goto out;
	error = decode_dirlist3(xdr);
out:
	return error;
}

static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req,
				    struct xdr_stream *xdr,
2095
				    void *data)
2096
{
2097
	struct nfs3_readdirres *result = data;
2098 2099 2100 2101 2102 2103 2104 2105
	enum nfs_stat status;
	int error;

	error = decode_nfsstat3(xdr, &status);
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_default;
2106
	error = decode_readdir3resok(xdr, result, rpc_rqst_userns(req));
2107 2108 2109
out:
	return error;
out_default:
2110
	error = decode_post_op_attr(xdr, result->dir_attr, rpc_rqst_userns(req));
2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146
	if (unlikely(error))
		goto out;
	return nfs3_stat_to_errno(status);
}

/*
 * 3.3.18  FSSTAT3res
 *
 *	struct FSSTAT3resok {
 *		post_op_attr	obj_attributes;
 *		size3		tbytes;
 *		size3		fbytes;
 *		size3		abytes;
 *		size3		tfiles;
 *		size3		ffiles;
 *		size3		afiles;
 *		uint32		invarsec;
 *	};
 *
 *	struct FSSTAT3resfail {
 *		post_op_attr	obj_attributes;
 *	};
 *
 *	union FSSTAT3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		FSSTAT3resok	resok;
 *	default:
 *		FSSTAT3resfail	resfail;
 *	};
 */
static int decode_fsstat3resok(struct xdr_stream *xdr,
			       struct nfs_fsstat *result)
{
	__be32 *p;

	p = xdr_inline_decode(xdr, 8 * 6 + 4);
2147 2148
	if (unlikely(!p))
		return -EIO;
2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160
	p = xdr_decode_size3(p, &result->tbytes);
	p = xdr_decode_size3(p, &result->fbytes);
	p = xdr_decode_size3(p, &result->abytes);
	p = xdr_decode_size3(p, &result->tfiles);
	p = xdr_decode_size3(p, &result->ffiles);
	xdr_decode_size3(p, &result->afiles);
	/* ignore invarsec */
	return 0;
}

static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req,
				   struct xdr_stream *xdr,
2161
				   void *data)
2162
{
2163
	struct nfs_fsstat *result = data;
2164 2165 2166 2167 2168 2169
	enum nfs_stat status;
	int error;

	error = decode_nfsstat3(xdr, &status);
	if (unlikely(error))
		goto out;
2170
	error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req));
2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_status;
	error = decode_fsstat3resok(xdr, result);
out:
	return error;
out_status:
	return nfs3_stat_to_errno(status);
}

/*
 * 3.3.19  FSINFO3res
 *
 *	struct FSINFO3resok {
 *		post_op_attr	obj_attributes;
 *		uint32		rtmax;
 *		uint32		rtpref;
 *		uint32		rtmult;
 *		uint32		wtmax;
 *		uint32		wtpref;
 *		uint32		wtmult;
 *		uint32		dtpref;
 *		size3		maxfilesize;
 *		nfstime3	time_delta;
 *		uint32		properties;
 *	};
 *
 *	struct FSINFO3resfail {
 *		post_op_attr	obj_attributes;
 *	};
 *
 *	union FSINFO3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		FSINFO3resok	resok;
 *	default:
 *		FSINFO3resfail	resfail;
 *	};
 */
static int decode_fsinfo3resok(struct xdr_stream *xdr,
			       struct nfs_fsinfo *result)
{
	__be32 *p;

	p = xdr_inline_decode(xdr, 4 * 7 + 8 + 8 + 4);
2216 2217
	if (unlikely(!p))
		return -EIO;
2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234
	result->rtmax  = be32_to_cpup(p++);
	result->rtpref = be32_to_cpup(p++);
	result->rtmult = be32_to_cpup(p++);
	result->wtmax  = be32_to_cpup(p++);
	result->wtpref = be32_to_cpup(p++);
	result->wtmult = be32_to_cpup(p++);
	result->dtpref = be32_to_cpup(p++);
	p = xdr_decode_size3(p, &result->maxfilesize);
	xdr_decode_nfstime3(p, &result->time_delta);

	/* ignore properties */
	result->lease_time = 0;
	return 0;
}

static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req,
				   struct xdr_stream *xdr,
2235
				   void *data)
2236