nfs3xdr.c 54.7 KB
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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>
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#include <linux/nfsacl.h>
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#include "internal.h"
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#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)
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#define NFS3_cookieverf_sz	(NFS3_COOKIEVERFSIZE>>2)
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#define NFS3_wcc_attr_sz	(6)
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#define NFS3_pre_op_attr_sz	(1+NFS3_wcc_attr_sz)
#define NFS3_post_op_attr_sz	(1+NFS3_fattr_sz)
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#define NFS3_wcc_data_sz	(NFS3_pre_op_attr_sz+NFS3_post_op_attr_sz)
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#define NFS3_diropargs_sz	(NFS3_fh_sz+NFS3_filename_sz)
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#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)
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#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)
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#define NFS3_symlinkargs_sz	(NFS3_diropargs_sz+1+NFS3_sattr_sz)
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#define NFS3_mknodargs_sz	(NFS3_diropargs_sz+2+NFS3_sattr_sz)
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#define NFS3_removeargs_sz	(NFS3_fh_sz+NFS3_filename_sz)
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#define NFS3_renameargs_sz	(NFS3_diropargs_sz+NFS3_diropargs_sz)
#define NFS3_linkargs_sz		(NFS3_fh_sz+NFS3_diropargs_sz)
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#define NFS3_readdirargs_sz	(NFS3_fh_sz+NFS3_cookieverf_sz+3)
#define NFS3_readdirplusargs_sz	(NFS3_fh_sz+NFS3_cookieverf_sz+4)
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#define NFS3_commitargs_sz	(NFS3_fh_sz+3)

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#define NFS3_getattrres_sz	(1+NFS3_fattr_sz)
#define NFS3_setattrres_sz	(1+NFS3_wcc_data_sz)
#define NFS3_removeres_sz	(NFS3_setattrres_sz)
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#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)
#define NFS3_readlinkres_sz	(1+NFS3_post_op_attr_sz+1)
#define NFS3_readres_sz		(1+NFS3_post_op_attr_sz+3)
#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)
#define NFS3_readdirres_sz	(1+NFS3_post_op_attr_sz+2)
#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)

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

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static int nfs3_stat_to_errno(enum nfs_stat);

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/*
 * Map file type to S_IFMT bits
 */
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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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};

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/*
 * While encoding arguments, set up the reply buffer in advance to
 * receive reply data directly into the page cache.
 */
static void prepare_reply_buffer(struct rpc_rqst *req, struct page **pages,
				 unsigned int base, unsigned int len,
				 unsigned int bufsize)
{
	struct rpc_auth	*auth = req->rq_cred->cr_auth;
	unsigned int replen;

	replen = RPC_REPHDRSIZE + auth->au_rslack + bufsize;
	xdr_inline_pages(&req->rq_rcv_buf, replen << 2, pages, base, len);
}

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/*
 * Handle decode buffer overflows out-of-line.
 */
static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
{
	dprintk("NFS: %s prematurely hit the end of our receive buffer. "
		"Remaining buffer length is %tu words.\n",
		func, xdr->end - xdr->p);
}

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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);
}

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

	p = xdr_inline_decode(xdr, 4);
	if (unlikely(p == NULL))
		goto out_overflow;
	*value = be32_to_cpup(p);
	return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

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

	p = xdr_inline_decode(xdr, 8);
	if (unlikely(p == NULL))
		goto out_overflow;
	xdr_decode_hyper(p, value);
	return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

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

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

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

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

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

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

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

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/*
 * 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);
}

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

	p = xdr_inline_decode(xdr, 4);
	if (unlikely(p == NULL))
		goto out_overflow;
	count = be32_to_cpup(p);
	if (unlikely(count >= xdr->buf->page_len || count > NFS3_MAXPATHLEN))
		goto out_nametoolong;
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	recvd = xdr_read_pages(xdr, count);
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	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;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

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

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

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/*
 * 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);
}

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

	p = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
	if (unlikely(p == NULL))
		goto out_overflow;
	memcpy(verifier, p, NFS3_COOKIEVERFSIZE);
	return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

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/*
 * 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);
}

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

	p = xdr_inline_decode(xdr, NFS3_WRITEVERFSIZE);
	if (unlikely(p == NULL))
		goto out_overflow;
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	memcpy(verifier->data, p, NFS3_WRITEVERFSIZE);
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	return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

/*
 * 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);
	if (unlikely(p == NULL))
		goto out_overflow;
	*status = be32_to_cpup(p);
	return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

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/*
 * 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);
}

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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;
}

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/*
 * 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));
}

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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;
}

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/*
 * 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;

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

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

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

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

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/*
 * 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;
}

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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;
}

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/*
 * 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;
 *	};
 */
static void encode_sattr3(struct xdr_stream *xdr, const struct iattr *attr)
{
	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);

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	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(&init_user_ns, 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(&init_user_ns, 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) {
		*p++ = xdr_two;
		p = xdr_encode_nfstime3(p, &attr->ia_atime);
	} else if (attr->ia_valid & ATTR_ATIME) {
		*p++ = xdr_one;
	} else
		*p++ = xdr_zero;

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

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/*
 * 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;
 *	};
 */
static int decode_fattr3(struct xdr_stream *xdr, struct nfs_fattr *fattr)
{
649
	umode_t fmode;
650 651 652 653 654
	__be32 *p;

	p = xdr_inline_decode(xdr, NFS3_fattr_sz << 2);
	if (unlikely(p == NULL))
		goto out_overflow;
655 656 657 658 659

	p = xdr_decode_ftype3(p, &fmode);

	fattr->mode = (be32_to_cpup(p++) & ~S_IFMT) | fmode;
	fattr->nlink = be32_to_cpup(p++);
660 661 662 663 664 665
	fattr->uid = make_kuid(&init_user_ns, be32_to_cpup(p++));
	if (!uid_valid(fattr->uid))
		goto out_uid;
	fattr->gid = make_kgid(&init_user_ns, be32_to_cpup(p++));
	if (!gid_valid(fattr->gid))
		goto out_gid;
666 667 668 669 670 671 672 673 674 675 676 677

	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);
678
	fattr->change_attr = nfs_timespec_to_change_attr(&fattr->ctime);
679 680

	fattr->valid |= NFS_ATTR_FATTR_V3;
681
	return 0;
682 683 684 685 686 687
out_uid:
	dprintk("NFS: returned invalid uid\n");
	return -EINVAL;
out_gid:
	dprintk("NFS: returned invalid gid\n");
	return -EINVAL;
688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

/*
 * post_op_attr
 *
 *	union post_op_attr switch (bool attributes_follow) {
 *	case TRUE:
 *		fattr3	attributes;
 *	case FALSE:
 *		void;
 *	};
 */
static int decode_post_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
{
	__be32 *p;

	p = xdr_inline_decode(xdr, 4);
	if (unlikely(p == NULL))
		goto out_overflow;
	if (*p != xdr_zero)
		return decode_fattr3(xdr, fattr);
	return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

/*
 * 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);
	if (unlikely(p == NULL))
		goto out_overflow;
733 734

	fattr->valid |= NFS_ATTR_FATTR_PRESIZE
735
		| NFS_ATTR_FATTR_PRECHANGE
736 737 738 739 740 741
		| 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);
742
	fattr->pre_change_attr = nfs_timespec_to_change_attr(&fattr->pre_ctime);
743

744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816
	return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

/*
 * 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);
	if (unlikely(p == NULL))
		goto out_overflow;
	if (*p != xdr_zero)
		return decode_wcc_attr(xdr, fattr);
	return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

static int decode_wcc_data(struct xdr_stream *xdr, struct nfs_fattr *fattr)
{
	int error;

	error = decode_pre_op_attr(xdr, fattr);
	if (unlikely(error))
		goto out;
	error = decode_post_op_attr(xdr, fattr);
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);
	if (unlikely(p == NULL))
		goto out_overflow;
	if (*p != xdr_zero)
		return decode_nfs_fh3(xdr, fh);
	zero_nfs_fh3(fh);
	return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832
/*
 * 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);
}


L
Linus Torvalds 已提交
833
/*
834 835 836 837
 * NFSv3 XDR encode functions
 *
 * NFSv3 argument types are defined in section 3.3 of RFC 1813:
 * "NFS Version 3 Protocol Specification".
L
Linus Torvalds 已提交
838 839
 */

840 841 842 843 844 845 846
/*
 * 3.3.1  GETATTR3args
 *
 *	struct GETATTR3args {
 *		nfs_fh3  object;
 *	};
 */
847 848 849
static void nfs3_xdr_enc_getattr3args(struct rpc_rqst *req,
				      struct xdr_stream *xdr,
				      const struct nfs_fh *fh)
850
{
851
	encode_nfs_fh3(xdr, fh);
852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877
}

/*
 * 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;
878
		xdr_encode_nfstime3(p, &args->guardtime);
879 880 881 882 883 884
	} else {
		p = xdr_reserve_space(xdr, 4);
		*p = xdr_zero;
	}
}

885 886 887
static void nfs3_xdr_enc_setattr3args(struct rpc_rqst *req,
				      struct xdr_stream *xdr,
				      const struct nfs3_sattrargs *args)
888
{
889 890 891
	encode_nfs_fh3(xdr, args->fh);
	encode_sattr3(xdr, args->sattr);
	encode_sattrguard3(xdr, args);
892 893 894 895 896 897 898 899 900
}

/*
 * 3.3.3  LOOKUP3args
 *
 *	struct LOOKUP3args {
 *		diropargs3  what;
 *	};
 */
901 902 903
static void nfs3_xdr_enc_lookup3args(struct rpc_rqst *req,
				     struct xdr_stream *xdr,
				     const struct nfs3_diropargs *args)
904
{
905
	encode_diropargs3(xdr, args->fh, args->name, args->len);
906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922
}

/*
 * 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);
}

923 924 925
static void nfs3_xdr_enc_access3args(struct rpc_rqst *req,
				     struct xdr_stream *xdr,
				     const struct nfs3_accessargs *args)
926
{
927
	encode_access3args(xdr, args);
928 929 930 931 932 933 934 935 936
}

/*
 * 3.3.5  READLINK3args
 *
 *	struct READLINK3args {
 *		nfs_fh3	symlink;
 *	};
 */
937 938 939
static void nfs3_xdr_enc_readlink3args(struct rpc_rqst *req,
				       struct xdr_stream *xdr,
				       const struct nfs3_readlinkargs *args)
940
{
941
	encode_nfs_fh3(xdr, args->fh);
942 943 944 945 946 947 948 949 950 951 952 953 954 955
	prepare_reply_buffer(req, args->pages, args->pgbase,
					args->pglen, NFS3_readlinkres_sz);
}

/*
 * 3.3.6  READ3args
 *
 *	struct READ3args {
 *		nfs_fh3		file;
 *		offset3		offset;
 *		count3		count;
 *	};
 */
static void encode_read3args(struct xdr_stream *xdr,
956
			     const struct nfs_pgio_args *args)
957 958 959 960 961 962 963 964 965 966
{
	__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);
}

967 968
static void nfs3_xdr_enc_read3args(struct rpc_rqst *req,
				   struct xdr_stream *xdr,
969
				   const struct nfs_pgio_args *args)
970
{
971
	encode_read3args(xdr, args);
972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994
	prepare_reply_buffer(req, args->pages, args->pgbase,
					args->count, NFS3_readres_sz);
	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,
995
			      const struct nfs_pgio_args *args)
996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008
{
	__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);
}

1009 1010
static void nfs3_xdr_enc_write3args(struct rpc_rqst *req,
				    struct xdr_stream *xdr,
1011
				    const struct nfs_pgio_args *args)
1012
{
1013 1014
	encode_write3args(xdr, args);
	xdr->buf->flags |= XDRBUF_WRITE;
1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055
}

/*
 * 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,
			      const struct nfs3_createargs *args)
{
	encode_uint32(xdr, args->createmode);
	switch (args->createmode) {
	case NFS3_CREATE_UNCHECKED:
	case NFS3_CREATE_GUARDED:
		encode_sattr3(xdr, args->sattr);
		break;
	case NFS3_CREATE_EXCLUSIVE:
		encode_createverf3(xdr, args->verifier);
		break;
	default:
		BUG();
	}
}

1056 1057 1058
static void nfs3_xdr_enc_create3args(struct rpc_rqst *req,
				     struct xdr_stream *xdr,
				     const struct nfs3_createargs *args)
1059
{
1060 1061
	encode_diropargs3(xdr, args->fh, args->name, args->len);
	encode_createhow3(xdr, args);
1062 1063 1064 1065 1066 1067 1068 1069 1070 1071
}

/*
 * 3.3.9  MKDIR3args
 *
 *	struct MKDIR3args {
 *		diropargs3	where;
 *		sattr3		attributes;
 *	};
 */
1072 1073 1074
static void nfs3_xdr_enc_mkdir3args(struct rpc_rqst *req,
				    struct xdr_stream *xdr,
				    const struct nfs3_mkdirargs *args)
1075
{
1076 1077
	encode_diropargs3(xdr, args->fh, args->name, args->len);
	encode_sattr3(xdr, args->sattr);
1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099
}

/*
 * 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,
				const struct nfs3_symlinkargs *args)
{
	encode_sattr3(xdr, args->sattr);
	encode_nfspath3(xdr, args->pages, args->pathlen);
}

1100 1101 1102
static void nfs3_xdr_enc_symlink3args(struct rpc_rqst *req,
				      struct xdr_stream *xdr,
				      const struct nfs3_symlinkargs *args)
1103
{
1104 1105
	encode_diropargs3(xdr, args->fromfh, args->fromname, args->fromlen);
	encode_symlinkdata3(xdr, args);
1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159
}

/*
 * 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,
			       const struct nfs3_mknodargs *args)
{
	encode_sattr3(xdr, args->sattr);
	encode_specdata3(xdr, args->rdev);
}

static void encode_mknoddata3(struct xdr_stream *xdr,
			      const struct nfs3_mknodargs *args)
{
	encode_ftype3(xdr, args->type);
	switch (args->type) {
	case NF3CHR:
	case NF3BLK:
		encode_devicedata3(xdr, args);
		break;
	case NF3SOCK:
	case NF3FIFO:
		encode_sattr3(xdr, args->sattr);
		break;
	case NF3REG:
	case NF3DIR:
		break;
	default:
		BUG();
	}
}

1160 1161 1162
static void nfs3_xdr_enc_mknod3args(struct rpc_rqst *req,
				    struct xdr_stream *xdr,
				    const struct nfs3_mknodargs *args)
1163
{
1164 1165
	encode_diropargs3(xdr, args->fh, args->name, args->len);
	encode_mknoddata3(xdr, args);
1166 1167 1168 1169 1170 1171 1172 1173 1174
}

/*
 * 3.3.12  REMOVE3args
 *
 *	struct REMOVE3args {
 *		diropargs3  object;
 *	};
 */
1175 1176 1177
static void nfs3_xdr_enc_remove3args(struct rpc_rqst *req,
				     struct xdr_stream *xdr,
				     const struct nfs_removeargs *args)
1178
{
1179
	encode_diropargs3(xdr, args->fh, args->name.name, args->name.len);
1180 1181 1182 1183 1184 1185 1186 1187 1188 1189
}

/*
 * 3.3.14  RENAME3args
 *
 *	struct RENAME3args {
 *		diropargs3	from;
 *		diropargs3	to;
 *	};
 */
1190 1191 1192
static void nfs3_xdr_enc_rename3args(struct rpc_rqst *req,
				     struct xdr_stream *xdr,
				     const struct nfs_renameargs *args)
1193 1194 1195 1196
{
	const struct qstr *old = args->old_name;
	const struct qstr *new = args->new_name;

1197 1198
	encode_diropargs3(xdr, args->old_dir, old->name, old->len);
	encode_diropargs3(xdr, args->new_dir, new->name, new->len);
1199 1200 1201 1202 1203 1204 1205 1206 1207 1208
}

/*
 * 3.3.15  LINK3args
 *
 *	struct LINK3args {
 *		nfs_fh3		file;
 *		diropargs3	link;
 *	};
 */
1209 1210 1211
static void nfs3_xdr_enc_link3args(struct rpc_rqst *req,
				   struct xdr_stream *xdr,
				   const struct nfs3_linkargs *args)
1212
{
1213 1214
	encode_nfs_fh3(xdr, args->fromfh);
	encode_diropargs3(xdr, args->tofh, args->toname, args->tolen);
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
}

/*
 * 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);
}

1240 1241 1242
static void nfs3_xdr_enc_readdir3args(struct rpc_rqst *req,
				      struct xdr_stream *xdr,
				      const struct nfs3_readdirargs *args)
1243
{
1244
	encode_readdir3args(xdr, args);
1245 1246 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
	prepare_reply_buffer(req, args->pages, 0,
				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);
}

1280 1281 1282
static void nfs3_xdr_enc_readdirplus3args(struct rpc_rqst *req,
					  struct xdr_stream *xdr,
					  const struct nfs3_readdirargs *args)
1283
{
1284
	encode_readdirplus3args(xdr, args);
1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298
	prepare_reply_buffer(req, args->pages, 0,
				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,
1299
			       const struct nfs_commitargs *args)
1300 1301 1302 1303 1304 1305 1306 1307 1308 1309
{
	__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);
}

1310 1311
static void nfs3_xdr_enc_commit3args(struct rpc_rqst *req,
				     struct xdr_stream *xdr,
1312
				     const struct nfs_commitargs *args)
1313
{
1314
	encode_commit3args(xdr, args);
1315 1316
}

1317 1318
#ifdef CONFIG_NFS_V3_ACL

1319 1320 1321
static void nfs3_xdr_enc_getacl3args(struct rpc_rqst *req,
				     struct xdr_stream *xdr,
				     const struct nfs3_getaclargs *args)
1322
{
1323 1324
	encode_nfs_fh3(xdr, args->fh);
	encode_uint32(xdr, args->mask);
1325 1326 1327 1328 1329 1330
	if (args->mask & (NFS_ACL | NFS_DFACL))
		prepare_reply_buffer(req, args->pages, 0,
					NFSACL_MAXPAGES << PAGE_SHIFT,
					ACL3_getaclres_sz);
}

1331 1332 1333
static void nfs3_xdr_enc_setacl3args(struct rpc_rqst *req,
				     struct xdr_stream *xdr,
				     const struct nfs3_setaclargs *args)
1334 1335 1336 1337
{
	unsigned int base;
	int error;

1338 1339
	encode_nfs_fh3(xdr, NFS_FH(args->inode));
	encode_uint32(xdr, args->mask);
1340 1341

	base = req->rq_slen;
1342
	if (args->npages != 0)
1343
		xdr_write_pages(xdr, args->pages, 0, args->len);
1344 1345
	else
		xdr_reserve_space(xdr, NFS_ACL_INLINE_BUFSIZE);
1346

1347
	error = nfsacl_encode(xdr->buf, base, args->inode,
1348 1349
			    (args->mask & NFS_ACL) ?
			    args->acl_access : NULL, 1, 0);
1350
	/* FIXME: this is just broken */
1351
	BUG_ON(error < 0);
1352
	error = nfsacl_encode(xdr->buf, base + error, args->inode,
1353 1354 1355 1356 1357 1358
			    (args->mask & NFS_DFACL) ?
			    args->acl_default : NULL, 1,
			    NFS_ACL_DEFAULT);
	BUG_ON(error < 0);
}

1359 1360
#endif  /* CONFIG_NFS_V3_ACL */

L
Linus Torvalds 已提交
1361
/*
1362 1363 1364 1365
 * NFSv3 XDR decode functions
 *
 * NFSv3 result types are defined in section 3.3 of RFC 1813:
 * "NFS Version 3 Protocol Specification".
L
Linus Torvalds 已提交
1366 1367 1368
 */

/*
1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380
 * 3.3.1  GETATTR3res
 *
 *	struct GETATTR3resok {
 *		fattr3		obj_attributes;
 *	};
 *
 *	union GETATTR3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		GETATTR3resok  resok;
 *	default:
 *		void;
 *	};
L
Linus Torvalds 已提交
1381
 */
1382 1383
static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req,
				    struct xdr_stream *xdr,
1384
				    struct nfs_fattr *result)
L
Linus Torvalds 已提交
1385
{
1386 1387 1388
	enum nfs_stat status;
	int error;

1389
	error = decode_nfsstat3(xdr, &status);
1390 1391 1392 1393
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_default;
1394
	error = decode_fattr3(xdr, result);
1395 1396 1397
out:
	return error;
out_default:
1398
	return nfs3_stat_to_errno(status);
1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418
}

/*
 * 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;
 *	};
 */
1419 1420
static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req,
				    struct xdr_stream *xdr,
1421 1422 1423 1424 1425
				    struct nfs_fattr *result)
{
	enum nfs_stat status;
	int error;

1426
	error = decode_nfsstat3(xdr, &status);
1427 1428
	if (unlikely(error))
		goto out;
1429
	error = decode_wcc_data(xdr, result);
1430 1431 1432 1433 1434 1435 1436
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_status;
out:
	return error;
out_status:
1437
	return nfs3_stat_to_errno(status);
1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459
}

/*
 * 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;
 *	};
 */
1460 1461
static int nfs3_xdr_dec_lookup3res(struct rpc_rqst *req,
				   struct xdr_stream *xdr,
1462 1463 1464 1465 1466
				   struct nfs3_diropres *result)
{
	enum nfs_stat status;
	int error;

1467
	error = decode_nfsstat3(xdr, &status);
1468 1469 1470 1471
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_default;
1472
	error = decode_nfs_fh3(xdr, result->fh);
1473 1474
	if (unlikely(error))
		goto out;
1475
	error = decode_post_op_attr(xdr, result->fattr);
1476 1477
	if (unlikely(error))
		goto out;
1478
	error = decode_post_op_attr(xdr, result->dir_attr);
1479 1480 1481
out:
	return error;
out_default:
1482
	error = decode_post_op_attr(xdr, result->dir_attr);
1483 1484
	if (unlikely(error))
		goto out;
1485
	return nfs3_stat_to_errno(status);
1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506
}

/*
 * 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;
 *	};
 */
1507 1508
static int nfs3_xdr_dec_access3res(struct rpc_rqst *req,
				   struct xdr_stream *xdr,
1509 1510 1511 1512 1513
				   struct nfs3_accessres *result)
{
	enum nfs_stat status;
	int error;

1514
	error = decode_nfsstat3(xdr, &status);
1515 1516
	if (unlikely(error))
		goto out;
1517
	error = decode_post_op_attr(xdr, result->fattr);
1518 1519 1520 1521
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_default;
1522
	error = decode_uint32(xdr, &result->access);
1523 1524 1525
out:
	return error;
out_default:
1526
	return nfs3_stat_to_errno(status);
1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547
}

/*
 * 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;
 *	};
 */
1548 1549
static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req,
				     struct xdr_stream *xdr,
1550 1551 1552 1553 1554
				     struct nfs_fattr *result)
{
	enum nfs_stat status;
	int error;

1555
	error = decode_nfsstat3(xdr, &status);
1556 1557
	if (unlikely(error))
		goto out;
1558
	error = decode_post_op_attr(xdr, result);
1559 1560 1561 1562
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_default;
1563
	error = decode_nfspath3(xdr);
1564 1565 1566
out:
	return error;
out_default:
1567
	return nfs3_stat_to_errno(status);
1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591
}

/*
 * 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,
1592
			     struct nfs_pgio_res *result)
1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604
{
	u32 eof, count, ocount, recvd;
	__be32 *p;

	p = xdr_inline_decode(xdr, 4 + 4 + 4);
	if (unlikely(p == NULL))
		goto out_overflow;
	count = be32_to_cpup(p++);
	eof = be32_to_cpup(p++);
	ocount = be32_to_cpup(p++);
	if (unlikely(ocount != count))
		goto out_mismatch;
1605
	recvd = xdr_read_pages(xdr, count);
1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626
	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;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

1627
static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1628
				 struct nfs_pgio_res *result)
1629 1630 1631 1632
{
	enum nfs_stat status;
	int error;

1633
	error = decode_nfsstat3(xdr, &status);
1634 1635
	if (unlikely(error))
		goto out;
1636
	error = decode_post_op_attr(xdr, result->fattr);
1637 1638
	if (unlikely(error))
		goto out;
1639
	result->op_status = status;
1640 1641
	if (status != NFS3_OK)
		goto out_status;
1642
	error = decode_read3resok(xdr, result);
1643 1644 1645
out:
	return error;
out_status:
1646
	return nfs3_stat_to_errno(status);
1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676
}

/*
 * 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,
1677
			      struct nfs_pgio_res *result)
1678 1679 1680
{
	__be32 *p;

1681
	p = xdr_inline_decode(xdr, 4 + 4);
1682 1683 1684 1685 1686 1687
	if (unlikely(p == NULL))
		goto out_overflow;
	result->count = be32_to_cpup(p++);
	result->verf->committed = be32_to_cpup(p++);
	if (unlikely(result->verf->committed > NFS_FILE_SYNC))
		goto out_badvalue;
1688 1689
	if (decode_writeverf3(xdr, &result->verf->verifier))
		goto out_eio;
1690 1691 1692 1693 1694 1695
	return result->count;
out_badvalue:
	dprintk("NFS: bad stable_how value: %u\n", result->verf->committed);
	return -EIO;
out_overflow:
	print_overflow_msg(__func__, xdr);
1696
out_eio:
1697 1698 1699
	return -EIO;
}

1700
static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1701
				  struct nfs_pgio_res *result)
1702 1703 1704 1705
{
	enum nfs_stat status;
	int error;

1706
	error = decode_nfsstat3(xdr, &status);
1707 1708
	if (unlikely(error))
		goto out;
1709
	error = decode_wcc_data(xdr, result->fattr);
1710 1711
	if (unlikely(error))
		goto out;
1712
	result->op_status = status;
1713 1714
	if (status != NFS3_OK)
		goto out_status;
1715
	error = decode_write3resok(xdr, result);
1716 1717 1718
out:
	return error;
out_status:
1719
	return nfs3_stat_to_errno(status);
1720 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 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763
}

/*
 * 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,
			       struct nfs3_diropres *result)
{
	int error;

	error = decode_post_op_fh3(xdr, result->fh);
	if (unlikely(error))
		goto out;
	error = decode_post_op_attr(xdr, result->fattr);
	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;
	error = decode_wcc_data(xdr, result->dir_attr);
out:
	return error;
}

1764 1765
static int nfs3_xdr_dec_create3res(struct rpc_rqst *req,
				   struct xdr_stream *xdr,
1766 1767 1768 1769 1770
				   struct nfs3_diropres *result)
{
	enum nfs_stat status;
	int error;

1771
	error = decode_nfsstat3(xdr, &status);
1772 1773 1774 1775
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_default;
1776
	error = decode_create3resok(xdr, result);
1777 1778 1779
out:
	return error;
out_default:
1780
	error = decode_wcc_data(xdr, result->dir_attr);
1781 1782
	if (unlikely(error))
		goto out;
1783
	return nfs3_stat_to_errno(status);
1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803
}

/*
 * 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;
 *	};
 */
1804 1805
static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req,
				   struct xdr_stream *xdr,
1806 1807 1808 1809 1810
				   struct nfs_removeres *result)
{
	enum nfs_stat status;
	int error;

1811
	error = decode_nfsstat3(xdr, &status);
1812 1813
	if (unlikely(error))
		goto out;
1814
	error = decode_wcc_data(xdr, result->dir_attr);
1815 1816 1817 1818 1819 1820 1821
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_status;
out:
	return error;
out_status:
1822
	return nfs3_stat_to_errno(status);
1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844
}

/*
 * 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;
 *	};
 */
1845 1846
static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req,
				   struct xdr_stream *xdr,
1847 1848 1849 1850 1851
				   struct nfs_renameres *result)
{
	enum nfs_stat status;
	int error;

1852
	error = decode_nfsstat3(xdr, &status);
1853 1854
	if (unlikely(error))
		goto out;
1855
	error = decode_wcc_data(xdr, result->old_fattr);
1856 1857
	if (unlikely(error))
		goto out;
1858
	error = decode_wcc_data(xdr, result->new_fattr);
1859 1860 1861 1862 1863 1864 1865
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_status;
out:
	return error;
out_status:
1866
	return nfs3_stat_to_errno(status);
1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888
}

/*
 * 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;
 *	};
 */
1889
static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1890 1891 1892 1893 1894
				 struct nfs3_linkres *result)
{
	enum nfs_stat status;
	int error;

1895
	error = decode_nfsstat3(xdr, &status);
1896 1897
	if (unlikely(error))
		goto out;
1898
	error = decode_post_op_attr(xdr, result->fattr);
1899 1900
	if (unlikely(error))
		goto out;
1901
	error = decode_wcc_data(xdr, result->dir_attr);
1902 1903 1904 1905 1906 1907 1908
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_status;
out:
	return error;
out_status:
1909
	return nfs3_stat_to_errno(status);
1910 1911 1912 1913 1914 1915 1916 1917 1918
}

/**
 * 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
 *
1919 1920
 * Returns zero if successful, otherwise a negative errno value is
 * returned.
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
 *
 * 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;
 *	};
 */
1947 1948
int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
		       int plus)
1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961
{
	struct nfs_entry old = *entry;
	__be32 *p;
	int error;

	p = xdr_inline_decode(xdr, 4);
	if (unlikely(p == NULL))
		goto out_overflow;
	if (*p == xdr_zero) {
		p = xdr_inline_decode(xdr, 4);
		if (unlikely(p == NULL))
			goto out_overflow;
		if (*p == xdr_zero)
1962
			return -EAGAIN;
1963
		entry->eof = 1;
1964
		return -EBADCOOKIE;
1965 1966 1967 1968
	}

	error = decode_fileid3(xdr, &entry->ino);
	if (unlikely(error))
1969
		return error;
1970 1971 1972

	error = decode_inline_filename3(xdr, &entry->name, &entry->len);
	if (unlikely(error))
1973
		return error;
1974 1975 1976 1977

	entry->prev_cookie = entry->cookie;
	error = decode_cookie3(xdr, &entry->cookie);
	if (unlikely(error))
1978
		return error;
1979 1980 1981 1982 1983 1984 1985

	entry->d_type = DT_UNKNOWN;

	if (plus) {
		entry->fattr->valid = 0;
		error = decode_post_op_attr(xdr, entry->fattr);
		if (unlikely(error))
1986
			return error;
1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998
		if (entry->fattr->valid & NFS_ATTR_FATTR_V3)
			entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);

		/* In fact, a post_op_fh3: */
		p = xdr_inline_decode(xdr, 4);
		if (unlikely(p == NULL))
			goto out_overflow;
		if (*p != xdr_zero) {
			error = decode_nfs_fh3(xdr, entry->fh);
			if (unlikely(error)) {
				if (error == -E2BIG)
					goto out_truncated;
1999
				return error;
2000 2001 2002 2003 2004
			}
		} else
			zero_nfs_fh3(entry->fh);
	}

2005
	return 0;
2006 2007 2008

out_overflow:
	print_overflow_msg(__func__, xdr);
2009
	return -EAGAIN;
2010 2011 2012
out_truncated:
	dprintk("NFS: directory entry contains invalid file handle\n");
	*entry = old;
2013
	return -EAGAIN;
2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046
}

/*
 * 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)
{
2047
	return xdr_read_pages(xdr, xdr->buf->page_len);
2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066
}

static int decode_readdir3resok(struct xdr_stream *xdr,
				struct nfs3_readdirres *result)
{
	int error;

	error = decode_post_op_attr(xdr, result->dir_attr);
	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;
}

2067 2068
static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req,
				    struct xdr_stream *xdr,
2069 2070 2071 2072 2073
				    struct nfs3_readdirres *result)
{
	enum nfs_stat status;
	int error;

2074
	error = decode_nfsstat3(xdr, &status);
2075 2076 2077 2078
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_default;
2079
	error = decode_readdir3resok(xdr, result);
2080 2081 2082
out:
	return error;
out_default:
2083
	error = decode_post_op_attr(xdr, result->dir_attr);
2084 2085
	if (unlikely(error))
		goto out;
2086
	return nfs3_stat_to_errno(status);
2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134
}

/*
 * 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);
	if (unlikely(p == NULL))
		goto out_overflow;
	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;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

2135 2136
static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req,
				   struct xdr_stream *xdr,
2137 2138 2139 2140 2141
				   struct nfs_fsstat *result)
{
	enum nfs_stat status;
	int error;

2142
	error = decode_nfsstat3(xdr, &status);
2143 2144
	if (unlikely(error))
		goto out;
2145
	error = decode_post_op_attr(xdr, result->fattr);
2146 2147 2148 2149
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_status;
2150
	error = decode_fsstat3resok(xdr, result);
2151 2152 2153
out:
	return error;
out_status:
2154
	return nfs3_stat_to_errno(status);
2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 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
}

/*
 * 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);
	if (unlikely(p == NULL))
		goto out_overflow;
	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);
2201
	xdr_decode_nfstime3(p, &result->time_delta);
2202 2203 2204 2205 2206 2207 2208 2209 2210

	/* ignore properties */
	result->lease_time = 0;
	return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

2211 2212
static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req,
				   struct xdr_stream *xdr,
2213 2214 2215 2216 2217
				   struct nfs_fsinfo *result)
{
	enum nfs_stat status;
	int error;

2218
	error = decode_nfsstat3(xdr, &status);
2219 2220
	if (unlikely(error))
		goto out;
2221
	error = decode_post_op_attr(xdr, result->fattr);
2222 2223 2224 2225
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_status;
2226
	error = decode_fsinfo3resok(xdr, result);
2227 2228 2229
out:
	return error;
out_status:
2230
	return nfs3_stat_to_errno(status);
2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273
}

/*
 * 3.3.20  PATHCONF3res
 *
 *	struct PATHCONF3resok {
 *		post_op_attr	obj_attributes;
 *		uint32		linkmax;
 *		uint32		name_max;
 *		bool		no_trunc;
 *		bool		chown_restricted;
 *		bool		case_insensitive;
 *		bool		case_preserving;
 *	};
 *
 *	struct PATHCONF3resfail {
 *		post_op_attr	obj_attributes;
 *	};
 *
 *	union PATHCONF3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		PATHCONF3resok	resok;
 *	default:
 *		PATHCONF3resfail resfail;
 *	};
 */
static int decode_pathconf3resok(struct xdr_stream *xdr,
				 struct nfs_pathconf *result)
{
	__be32 *p;

	p = xdr_inline_decode(xdr, 4 * 6);
	if (unlikely(p == NULL))
		goto out_overflow;
	result->max_link = be32_to_cpup(p++);
	result->max_namelen = be32_to_cpup(p);
	/* ignore remaining fields */
	return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

2274 2275
static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req,
				     struct xdr_stream *xdr,
2276 2277 2278 2279 2280
				     struct nfs_pathconf *result)
{
	enum nfs_stat status;
	int error;

2281
	error = decode_nfsstat3(xdr, &status);
2282 2283
	if (unlikely(error))
		goto out;
2284
	error = decode_post_op_attr(xdr, result->fattr);
2285 2286 2287 2288
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_status;
2289
	error = decode_pathconf3resok(xdr, result);
2290 2291 2292
out:
	return error;
out_status:
2293
	return nfs3_stat_to_errno(status);
2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314
}

/*
 * 3.3.21  COMMIT3res
 *
 *	struct COMMIT3resok {
 *		wcc_data	file_wcc;
 *		writeverf3	verf;
 *	};
 *
 *	struct COMMIT3resfail {
 *		wcc_data	file_wcc;
 *	};
 *
 *	union COMMIT3res switch (nfsstat3 status) {
 *	case NFS3_OK:
 *		COMMIT3resok	resok;
 *	default:
 *		COMMIT3resfail	resfail;
 *	};
 */
2315 2316
static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req,
				   struct xdr_stream *xdr,
2317
				   struct nfs_commitres *result)
2318 2319 2320 2321
{
	enum nfs_stat status;
	int error;

2322
	error = decode_nfsstat3(xdr, &status);
2323 2324
	if (unlikely(error))
		goto out;
2325
	error = decode_wcc_data(xdr, result->fattr);
2326 2327
	if (unlikely(error))
		goto out;
2328
	result->op_status = status;
2329 2330
	if (status != NFS3_OK)
		goto out_status;
2331
	error = decode_writeverf3(xdr, &result->verf->verifier);
2332 2333 2334
out:
	return error;
out_status:
2335
	return nfs3_stat_to_errno(status);
2336 2337
}

2338 2339
#ifdef CONFIG_NFS_V3_ACL

2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357
static inline int decode_getacl3resok(struct xdr_stream *xdr,
				      struct nfs3_getaclres *result)
{
	struct posix_acl **acl;
	unsigned int *aclcnt;
	size_t hdrlen;
	int error;

	error = decode_post_op_attr(xdr, result->fattr);
	if (unlikely(error))
		goto out;
	error = decode_uint32(xdr, &result->mask);
	if (unlikely(error))
		goto out;
	error = -EINVAL;
	if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
		goto out;

2358
	hdrlen = xdr_stream_pos(xdr);
2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383

	acl = NULL;
	if (result->mask & NFS_ACL)
		acl = &result->acl_access;
	aclcnt = NULL;
	if (result->mask & NFS_ACLCNT)
		aclcnt = &result->acl_access_count;
	error = nfsacl_decode(xdr->buf, hdrlen, aclcnt, acl);
	if (unlikely(error <= 0))
		goto out;

	acl = NULL;
	if (result->mask & NFS_DFACL)
		acl = &result->acl_default;
	aclcnt = NULL;
	if (result->mask & NFS_DFACLCNT)
		aclcnt = &result->acl_default_count;
	error = nfsacl_decode(xdr->buf, hdrlen + error, aclcnt, acl);
	if (unlikely(error <= 0))
		return error;
	error = 0;
out:
	return error;
}

2384 2385
static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req,
				   struct xdr_stream *xdr,
2386 2387 2388 2389 2390
				   struct nfs3_getaclres *result)
{
	enum nfs_stat status;
	int error;

2391
	error = decode_nfsstat3(xdr, &status);
2392 2393 2394 2395
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_default;
2396
	error = decode_getacl3resok(xdr, result);
2397 2398 2399
out:
	return error;
out_default:
2400
	return nfs3_stat_to_errno(status);
2401 2402
}

2403 2404
static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req,
				   struct xdr_stream *xdr,
2405 2406 2407 2408 2409
				   struct nfs_fattr *result)
{
	enum nfs_stat status;
	int error;

2410
	error = decode_nfsstat3(xdr, &status);
2411 2412 2413 2414
	if (unlikely(error))
		goto out;
	if (status != NFS3_OK)
		goto out_default;
2415
	error = decode_post_op_attr(xdr, result);
2416 2417 2418
out:
	return error;
out_default:
2419
	return nfs3_stat_to_errno(status);
2420 2421
}

2422 2423
#endif  /* CONFIG_NFS_V3_ACL */

2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488

/*
 * We need to translate between nfs status return values and
 * the local errno values which may not be the same.
 */
static const struct {
	int stat;
	int errno;
} nfs_errtbl[] = {
	{ NFS_OK,		0		},
	{ NFSERR_PERM,		-EPERM		},
	{ NFSERR_NOENT,		-ENOENT		},
	{ NFSERR_IO,		-errno_NFSERR_IO},
	{ NFSERR_NXIO,		-ENXIO		},
/*	{ NFSERR_EAGAIN,	-EAGAIN		}, */
	{ NFSERR_ACCES,		-EACCES		},
	{ NFSERR_EXIST,		-EEXIST		},
	{ NFSERR_XDEV,		-EXDEV		},
	{ NFSERR_NODEV,		-ENODEV		},
	{ NFSERR_NOTDIR,	-ENOTDIR	},
	{ NFSERR_ISDIR,		-EISDIR		},
	{ NFSERR_INVAL,		-EINVAL		},
	{ NFSERR_FBIG,		-EFBIG		},
	{ NFSERR_NOSPC,		-ENOSPC		},
	{ NFSERR_ROFS,		-EROFS		},
	{ NFSERR_MLINK,		-EMLINK		},
	{ NFSERR_NAMETOOLONG,	-ENAMETOOLONG	},
	{ NFSERR_NOTEMPTY,	-ENOTEMPTY	},
	{ NFSERR_DQUOT,		-EDQUOT		},
	{ NFSERR_STALE,		-ESTALE		},
	{ NFSERR_REMOTE,	-EREMOTE	},
#ifdef EWFLUSH
	{ NFSERR_WFLUSH,	-EWFLUSH	},
#endif
	{ NFSERR_BADHANDLE,	-EBADHANDLE	},
	{ NFSERR_NOT_SYNC,	-ENOTSYNC	},
	{ NFSERR_BAD_COOKIE,	-EBADCOOKIE	},
	{ NFSERR_NOTSUPP,	-ENOTSUPP	},
	{ NFSERR_TOOSMALL,	-ETOOSMALL	},
	{ NFSERR_SERVERFAULT,	-EREMOTEIO	},
	{ NFSERR_BADTYPE,	-EBADTYPE	},
	{ NFSERR_JUKEBOX,	-EJUKEBOX	},
	{ -1,			-EIO		}
};

/**
 * nfs3_stat_to_errno - convert an NFS status code to a local errno
 * @status: NFS status code to convert
 *
 * Returns a local errno value, or -EIO if the NFS status code is
 * not recognized.  This function is used jointly by NFSv2 and NFSv3.
 */
static int nfs3_stat_to_errno(enum nfs_stat status)
{
	int i;

	for (i = 0; nfs_errtbl[i].stat != -1; i++) {
		if (nfs_errtbl[i].stat == (int)status)
			return nfs_errtbl[i].errno;
	}
	dprintk("NFS: Unrecognized nfs status value: %u\n", status);
	return nfs_errtbl[i].errno;
}


L
Linus Torvalds 已提交
2489 2490 2491
#define PROC(proc, argtype, restype, timer)				\
[NFS3PROC_##proc] = {							\
	.p_proc      = NFS3PROC_##proc,					\
2492
	.p_encode    = (kxdreproc_t)nfs3_xdr_enc_##argtype##3args,	\
2493
	.p_decode    = (kxdrdproc_t)nfs3_xdr_dec_##restype##3res,	\
2494
	.p_arglen    = NFS3_##argtype##args_sz,				\
2495
	.p_replen    = NFS3_##restype##res_sz,				\
2496 2497 2498
	.p_timer     = timer,						\
	.p_statidx   = NFS3PROC_##proc,					\
	.p_name      = #proc,						\
L
Linus Torvalds 已提交
2499 2500 2501
	}

struct rpc_procinfo	nfs3_procedures[] = {
2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522
	PROC(GETATTR,		getattr,	getattr,	1),
	PROC(SETATTR,		setattr,	setattr,	0),
	PROC(LOOKUP,		lookup,		lookup,		2),
	PROC(ACCESS,		access,		access,		1),
	PROC(READLINK,		readlink,	readlink,	3),
	PROC(READ,		read,		read,		3),
	PROC(WRITE,		write,		write,		4),
	PROC(CREATE,		create,		create,		0),
	PROC(MKDIR,		mkdir,		create,		0),
	PROC(SYMLINK,		symlink,	create,		0),
	PROC(MKNOD,		mknod,		create,		0),
	PROC(REMOVE,		remove,		remove,		0),
	PROC(RMDIR,		lookup,		setattr,	0),
	PROC(RENAME,		rename,		rename,		0),
	PROC(LINK,		link,		link,		0),
	PROC(READDIR,		readdir,	readdir,	3),
	PROC(READDIRPLUS,	readdirplus,	readdir,	3),
	PROC(FSSTAT,		getattr,	fsstat,		0),
	PROC(FSINFO,		getattr,	fsinfo,		0),
	PROC(PATHCONF,		getattr,	pathconf,	0),
	PROC(COMMIT,		commit,		commit,		5),
L
Linus Torvalds 已提交
2523 2524
};

2525
const struct rpc_version nfs_version3 = {
L
Linus Torvalds 已提交
2526
	.number			= 3,
2527
	.nrprocs		= ARRAY_SIZE(nfs3_procedures),
L
Linus Torvalds 已提交
2528 2529 2530
	.procs			= nfs3_procedures
};

2531 2532 2533 2534
#ifdef CONFIG_NFS_V3_ACL
static struct rpc_procinfo	nfs3_acl_procedures[] = {
	[ACLPROC3_GETACL] = {
		.p_proc = ACLPROC3_GETACL,
2535
		.p_encode = (kxdreproc_t)nfs3_xdr_enc_getacl3args,
2536
		.p_decode = (kxdrdproc_t)nfs3_xdr_dec_getacl3res,
2537 2538
		.p_arglen = ACL3_getaclargs_sz,
		.p_replen = ACL3_getaclres_sz,
2539
		.p_timer = 1,
2540
		.p_name = "GETACL",
2541 2542 2543
	},
	[ACLPROC3_SETACL] = {
		.p_proc = ACLPROC3_SETACL,
2544
		.p_encode = (kxdreproc_t)nfs3_xdr_enc_setacl3args,
2545
		.p_decode = (kxdrdproc_t)nfs3_xdr_dec_setacl3res,
2546 2547
		.p_arglen = ACL3_setaclargs_sz,
		.p_replen = ACL3_setaclres_sz,
2548
		.p_timer = 0,
2549
		.p_name = "SETACL",
2550 2551 2552
	},
};

2553
const struct rpc_version nfsacl_version3 = {
2554 2555 2556 2557 2558 2559
	.number			= 3,
	.nrprocs		= sizeof(nfs3_acl_procedures)/
				  sizeof(nfs3_acl_procedures[0]),
	.procs			= nfs3_acl_procedures,
};
#endif  /* CONFIG_NFS_V3_ACL */