// SPDX-License-Identifier: GPL-2.0
/*
 * Process version 2 NFS requests.
 *
 * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
 */

#include <linux/namei.h>
#include <linux/sunrpc/svc.h>

#include "nfs2xdr_gen.h"

#include "auth.h"
#include "nfsd.h"
#include "cache.h"
#include "xdr.h"
#include "vfs.h"
#include "nfserr.h"
#include "trace.h"

#define NFSDDBG_FACILITY		NFSDDBG_PROC

/*
 * Wrapper structures combine xdrgen types with legacy structures.
 * The xdrgen field must be first so the structure can be cast
 * to its XDR type for the RPC dispatch layer.
 */

struct fhandle_wrapper {
	fhandle			xdrgen;
	struct svc_fh		fh;
};

static_assert(offsetof(struct fhandle_wrapper, xdrgen) == 0);

struct attrstat_wrapper {
	struct attrstat		xdrgen;
	struct kstat		stat;
};

static_assert(offsetof(struct attrstat_wrapper, xdrgen) == 0);

struct sattrargs_wrapper {
	struct sattrargs	xdrgen;
	struct svc_fh		fh;
	struct iattr		iattrs;
};

static_assert(offsetof(struct sattrargs_wrapper, xdrgen) == 0);

struct diropargs_wrapper {
	struct diropargs	xdrgen;
	struct svc_fh		fh;
};

static_assert(offsetof(struct diropargs_wrapper, xdrgen) == 0);

struct diropres_wrapper {
	struct diropres		xdrgen;
	struct svc_fh		fh;
	struct kstat		stat;
};

static_assert(offsetof(struct diropres_wrapper, xdrgen) == 0);

struct createargs_wrapper {
	struct createargs	xdrgen;
	struct svc_fh		fh;
	struct iattr		iattrs;
};

static_assert(offsetof(struct createargs_wrapper, xdrgen) == 0);

struct readargs_wrapper {
	struct readargs		xdrgen;
	struct svc_fh		fh;
};

static_assert(offsetof(struct readargs_wrapper, xdrgen) == 0);

struct writeargs_wrapper {
	struct writeargs	xdrgen;
	struct svc_fh		fh;
};

static_assert(offsetof(struct writeargs_wrapper, xdrgen) == 0);

struct renameargs_wrapper {
	struct renameargs	xdrgen;
	struct svc_fh		ffh;
	struct svc_fh		tfh;
};

static_assert(offsetof(struct renameargs_wrapper, xdrgen) == 0);

struct linkargs_wrapper {
	struct linkargs		xdrgen;
	struct svc_fh		ffh;
	struct svc_fh		tfh;
};

static_assert(offsetof(struct linkargs_wrapper, xdrgen) == 0);

struct symlinkargs_wrapper {
	struct symlinkargs	xdrgen;
	struct svc_fh		ffh;
	struct iattr		iattrs;
};

static_assert(offsetof(struct symlinkargs_wrapper, xdrgen) == 0);

struct statfsres_wrapper {
	struct statfsres	xdrgen;
	struct kstatfs		stats;
};

static_assert(offsetof(struct statfsres_wrapper, xdrgen) == 0);

static __be32 nfsd_map_status(__be32 status)
{
	switch (status) {
	case nfs_ok:
		break;
	case nfserr_nofilehandle:
	case nfserr_badhandle:
		status = nfserr_stale;
		break;
	case nfserr_wrongsec:
	case nfserr_xdev:
	case nfserr_file_open:
		status = nfserr_acces;
		break;
	case nfserr_symlink_not_dir:
		status = nfserr_notdir;
		break;
	case nfserr_symlink:
	case nfserr_wrong_type:
		status = nfserr_io;
		break;
	}
	return status;
}

static __always_inline void
nfsd_fhandle_to_svc_fh(struct svc_fh *fhp, const fhandle *fhandle)
{
	fh_init(fhp, NFS_FHSIZE);
	fhp->fh_handle.fh_size = NFS_FHSIZE;
	memcpy(&fhp->fh_handle.fh_raw, fhandle, NFS_FHSIZE);
}

static __always_inline void
nfsd_svc_fh_to_fhandle(fhandle *fhandle, const struct svc_fh *fhp)
{
	memcpy(fhandle, fhp->fh_handle.fh_raw, NFS_FHSIZE);
}

static __always_inline void
nfsd_timespec64_to_timeval(struct timeval *dst,
			   const struct timespec64 *src)
{
	dst->seconds = src->tv_sec;
	dst->useconds = src->tv_nsec / NSEC_PER_USEC;
}

static __always_inline void
nfsd_timeval_to_timespec64(struct timespec64 *dst, const struct timeval *src)
{
	dst->tv_sec = src->seconds;
	dst->tv_nsec = src->useconds * NSEC_PER_USEC;
}

static u32
nfsd_mode_to_ftype(umode_t mode)
{
	switch (mode & S_IFMT) {
	case S_IFREG:  return NFREG;
	case S_IFDIR:  return NFDIR;
	case S_IFBLK:  return NFBLK;
	case S_IFCHR:  return NFCHR;
	case S_IFLNK:  return NFLNK;
	/*
	 * The NFSv2 protocol's ftype enum does not provide specific values
	 * for sockets and FIFOs.
	 */
	case S_IFSOCK: return NFNON;
	case S_IFIFO:  return NFNON;
	}
	return NFNON;
}

static void
nfsd_stat_to_fattr(struct svc_rqst *rqstp, struct fattr *fattr,
		   const struct kstat *stat, const struct svc_fh *fhp)
{
	struct user_namespace *userns = nfsd_user_namespace(rqstp);
	struct timespec64 time;
	u32 fsid;

	fattr->type = nfsd_mode_to_ftype(stat->mode);
	fattr->mode = stat->mode;
	fattr->nlink = stat->nlink;
	fattr->uid = from_kuid_munged(userns, stat->uid);
	fattr->gid = from_kgid_munged(userns, stat->gid);
	if (S_ISLNK(stat->mode) && stat->size > NFS_MAXPATHLEN)
		fattr->size = NFS_MAXPATHLEN;
	else
		fattr->size = stat->size;
	fattr->blocksize = stat->blksize;
	if (S_ISCHR(stat->mode) || S_ISBLK(stat->mode))
		fattr->rdev = new_encode_dev(stat->rdev);
	else
		fattr->rdev = 0xffffffff;
	fattr->blocks = stat->blocks;

	switch (fsid_source(fhp)) {
	case FSIDSOURCE_FSID:
		fsid = (u32)fhp->fh_export->ex_fsid;
		break;
	case FSIDSOURCE_UUID:
		fsid = ((u32 *)fhp->fh_export->ex_uuid)[0];
		fsid ^= ((u32 *)fhp->fh_export->ex_uuid)[1];
		fsid ^= ((u32 *)fhp->fh_export->ex_uuid)[2];
		fsid ^= ((u32 *)fhp->fh_export->ex_uuid)[3];
		break;
	default:
		fsid = new_encode_dev(stat->dev);
	}
	fattr->fsid = fsid;
	fattr->fileid = stat->ino;

	nfsd_timespec64_to_timeval(&fattr->atime, &stat->atime);
	time = stat->mtime;
	lease_get_mtime(d_inode(fhp->fh_dentry), &time);
	nfsd_timespec64_to_timeval(&fattr->mtime, &time);
	nfsd_timespec64_to_timeval(&fattr->ctime, &stat->ctime);
}

/*
 * Because NFSv2 does not have an NFSERR_SYMLINK, Solaris returns
 * NFSERR_ISDIR when the target of a READ or WRITE is any object
 * that is not a regular file.
 */
static __be32 nfsd_map_io_status(__be32 status)
{
	switch (status) {
	case nfserr_symlink:
	case nfserr_wrong_type:
		return nfserr_isdir;
	}
	return nfsd_map_status(status);
}

/*
 * Sun convention: a sattr time-useconds field of one full second (an
 * otherwise out-of-range value) means "set this time to the current
 * server time." It's needed to make permissions checks for the "touch"
 * program across NFSv2 mounts work correctly. See description of
 * sattr in section 6.1 of "NFS Illustrated" by Brent Callaghan,
 * Addison-Wesley, ISBN 0-201-32750-5
 */
#define NFS2_SATTR_SET_TO_SERVER_TIME	(1000000)

static bool
nfsd_sattr_to_iattr(struct svc_rqst *rqstp, struct iattr *iap,
		    const struct sattr *sattr)
{
	static const unsigned int dont_set_it = (unsigned int)-1;

	/* Consumers read ia_size, ia_uid, and ia_gid unguarded by ia_valid */
	memset(iap, 0, sizeof(*iap));

	/*
	 * Some Sun NFS clients put 0xffff in the mode field when they
	 * mean 0xffffffff.
	 */
	if (sattr->mode != dont_set_it && sattr->mode != 0xffff) {
		iap->ia_valid |= ATTR_MODE;
		iap->ia_mode = sattr->mode;
	}
	if (sattr->uid != dont_set_it) {
		iap->ia_uid = make_kuid(nfsd_user_namespace(rqstp), sattr->uid);
		if (uid_valid(iap->ia_uid))
			iap->ia_valid |= ATTR_UID;
	}
	if (sattr->gid != dont_set_it) {
		iap->ia_gid = make_kgid(nfsd_user_namespace(rqstp), sattr->gid);
		if (gid_valid(iap->ia_gid))
			iap->ia_valid |= ATTR_GID;
	}
	if (sattr->size != dont_set_it) {
		iap->ia_valid |= ATTR_SIZE;
		iap->ia_size = sattr->size;
	}
	if (sattr->atime.seconds != dont_set_it &&
	    sattr->atime.useconds != dont_set_it) {
		/*
		 * Reject out-of-range useconds so the conversion to
		 * nanoseconds cannot wrap to a valid but incorrect
		 * value on 32-bit platforms.
		 */
		if (sattr->atime.useconds > NFS2_SATTR_SET_TO_SERVER_TIME)
			return false;
		iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
		nfsd_timeval_to_timespec64(&iap->ia_atime, &sattr->atime);

		if (sattr->atime.useconds == NFS2_SATTR_SET_TO_SERVER_TIME)
			iap->ia_valid &= ~ATTR_ATIME_SET;
	}
	if (sattr->mtime.seconds != dont_set_it &&
	    sattr->mtime.useconds != dont_set_it) {
		if (sattr->mtime.useconds > NFS2_SATTR_SET_TO_SERVER_TIME)
			return false;
		iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
		nfsd_timeval_to_timespec64(&iap->ia_mtime, &sattr->mtime);

		if (sattr->mtime.useconds == NFS2_SATTR_SET_TO_SERVER_TIME)
			iap->ia_valid &= ~(ATTR_ATIME_SET | ATTR_MTIME_SET);
	}

	return true;
}

/*
 * A full specification of each of the following NFSv2 procedures is
 * available in RFC 1094 Section 2.2.
 */

/**
 * nfsd_proc_null - NULL: Do nothing
 * @rqstp: RPC transaction context
 *
 * Return:
 *   %rpc_success:		RPC executed successfully
 *
 * RPC synopsis:
 *   void NFSPROC_NULL(void) = 0;
 */
static __be32 nfsd_proc_null(struct svc_rqst *rqstp)
{
	return rpc_success;
}

/**
 * nfsd_proc_getattr - GETATTR: Get file attributes
 * @rqstp: RPC transaction context
 *
 * Return:
 *   %rpc_success:		RPC executed successfully
 *
 * RPC synopsis:
 *   attrstat NFSPROC_GETATTR(fhandle) = 1;
 */
static __be32 nfsd_proc_getattr(struct svc_rqst *rqstp)
{
	struct fhandle_wrapper *argp = rqstp->rq_argp;
	struct attrstat_wrapper *resp = rqstp->rq_resp;
	struct kstat *statp = &resp->stat;
	struct svc_fh *fhp = &argp->fh;

	nfsd_fhandle_to_svc_fh(fhp, &argp->xdrgen);
	trace_nfsd_vfs_getattr(rqstp, fhp);
	resp->xdrgen.status = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP |
					NFSD_MAY_BYPASS_GSS_ON_ROOT);
	if (resp->xdrgen.status != nfs_ok)
		goto out;

	resp->xdrgen.status = fh_getattr(fhp, statp);

out:
	if (resp->xdrgen.status == nfs_ok)
		nfsd_stat_to_fattr(rqstp, &resp->xdrgen.u.attributes, statp, fhp);
	else
		resp->xdrgen.status = nfsd_map_status(resp->xdrgen.status);

	fh_put(fhp);
	return rpc_success;
}

/**
 * nfsd_proc_setattr - SETATTR: Set file attributes
 * @rqstp: RPC transaction context
 *
 * Return:
 *   %rpc_success:		RPC executed successfully
 *
 * RPC synopsis:
 *   attrstat NFSPROC_SETATTR(sattrargs) = 2;
 */
static __be32 nfsd_proc_setattr(struct svc_rqst *rqstp)
{
	struct sattrargs_wrapper *argp = rqstp->rq_argp;
	struct attrstat_wrapper *resp = rqstp->rq_resp;
	struct kstat *statp = &resp->stat;
	struct iattr *iap = &argp->iattrs;
	struct nfsd_attrs nattrs = {
		.na_iattr	= iap,
	};
	struct svc_fh *fhp = &argp->fh;

	nfsd_fhandle_to_svc_fh(fhp, &argp->xdrgen.file);
	if (!nfsd_sattr_to_iattr(rqstp, iap, &argp->xdrgen.attributes)) {
		resp->xdrgen.status = nfserr_io;
		goto out;
	}

	/*
	 * NFSv2 does not differentiate between "set-[ac]time-to-now"
	 * which only requires access, and "set-[ac]time-to-X" which
	 * requires ownership.
	 * So if it looks like it might be "set both to the same time which
	 * is close to now", and if setattr_prepare fails, then we
	 * convert to "set to now" instead of "set to explicit time"
	 *
	 * We only call setattr_prepare as the last test as technically
	 * it is not an interface that we should be using.
	 */
#define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
#define	MAX_TOUCH_TIME_ERROR (30*60)
	if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET &&
	    iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) {
		int hosterr;

		/*
		 * Looks probable.
		 *
		 * Now just make sure time is in the right ballpark.
		 * Solaris, at least, doesn't seem to care what the time
		 * request is.  We require it be within 30 minutes of now.
		 */
		time64_t delta = iap->ia_atime.tv_sec - ktime_get_real_seconds();

		resp->xdrgen.status = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP);
		if (resp->xdrgen.status != nfs_ok)
			goto out;

		hosterr = fh_want_write(fhp);
		if (hosterr) {
			resp->xdrgen.status = nfserrno(hosterr);
			goto out;
		}

		if (delta < 0)
			delta = -delta;
		if (delta < MAX_TOUCH_TIME_ERROR &&
		    setattr_prepare(&nop_mnt_idmap, fhp->fh_dentry, iap) != 0) {
			/*
			 * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME.
			 * This will cause notify_change to set these times
			 * to "now"
			 */
			iap->ia_valid &= ~BOTH_TIME_SET;
		}
	}

	resp->xdrgen.status = nfsd_setattr(rqstp, fhp, &nattrs, NULL);
	if (resp->xdrgen.status != nfs_ok)
		goto out;

	resp->xdrgen.status = fh_getattr(fhp, statp);

out:
	if (resp->xdrgen.status == nfs_ok)
		nfsd_stat_to_fattr(rqstp, &resp->xdrgen.u.attributes, statp, fhp);
	else
		resp->xdrgen.status = nfsd_map_status(resp->xdrgen.status);

	fh_put(fhp);
	return rpc_success;
}

/**
 * nfsd_proc_root - ROOT: Get filesystem root
 * @rqstp: RPC transaction context
 *
 * Obsolete, replaced by MNTPROC_MNT.
 *
 * Return:
 *   %rpc_success:		RPC executed successfully
 *
 * RPC synopsis:
 *   void NFSPROC_ROOT(void) = 3;
 */
static __be32 nfsd_proc_root(struct svc_rqst *rqstp)
{
	return rpc_success;
}

/**
 * nfsd_proc_lookup - LOOKUP: Look up file name
 * @rqstp: RPC transaction context
 *
 * Return:
 *   %rpc_success:		RPC executed successfully
 *
 * RPC synopsis:
 *   diropres NFSPROC_LOOKUP(diropargs) = 4;
 */
static __be32 nfsd_proc_lookup(struct svc_rqst *rqstp)
{
	struct diropargs_wrapper *argp = rqstp->rq_argp;
	struct diropres_wrapper *resp = rqstp->rq_resp;
	struct diropargs *what = &argp->xdrgen;
	struct kstat *statp = &resp->stat;
	struct svc_fh *dirfhp = &argp->fh;
	struct svc_fh *fhp = &resp->fh;

	nfsd_fhandle_to_svc_fh(dirfhp, &what->dir);

	fh_init(fhp, NFS_FHSIZE);
	resp->xdrgen.status = nfsd_lookup(rqstp, dirfhp,
					  (char *)what->name.data,
					  what->name.len, fhp);
	if (resp->xdrgen.status != nfs_ok)
		goto out;
	resp->xdrgen.status = fh_getattr(fhp, statp);

out:
	if (resp->xdrgen.status == nfs_ok) {
		nfsd_svc_fh_to_fhandle(&resp->xdrgen.u.diropok.file, fhp);
		nfsd_stat_to_fattr(rqstp, &resp->xdrgen.u.diropok.attributes,
				   statp, fhp);
	} else {
		resp->xdrgen.status = nfsd_map_status(resp->xdrgen.status);
	}

	fh_put(fhp);
	fh_put(dirfhp);
	return rpc_success;
}

/**
 * nfsd_proc_readlink - READLINK: Read symbolic link
 * @rqstp: RPC transaction context
 *
 * Return:
 *   %rpc_success:		RPC executed successfully
 *
 * RPC synopsis:
 *   readlinkres NFSPROC_READLINK(fhandle) = 5;
 */
static __be32 nfsd_proc_readlink(struct svc_rqst *rqstp)
{
	struct fhandle_wrapper *argp = rqstp->rq_argp;
	struct readlinkres *resp = rqstp->rq_resp;
	struct svc_fh *fhp = &argp->fh;
	struct page *page;
	u32 len;

	nfsd_fhandle_to_svc_fh(fhp, &argp->xdrgen);

	len = NFS_MAXPATHLEN;
	page = *(rqstp->rq_next_page++);
	resp->status = nfsd_readlink(rqstp, fhp, page_address(page), &len);
	if (resp->status == nfs_ok)
		resp->u.data.len = len;
	else
		resp->status = nfsd_map_status(resp->status);

	fh_put(fhp);
	return rpc_success;
}

/**
 * nfsd_proc_read - READ: Read from file
 * @rqstp: RPC transaction context
 *
 * Return:
 *   %rpc_success:		RPC executed successfully
 *
 * RPC synopsis:
 *   readres NFSPROC_READ(readargs) = 6;
 */
static __be32 nfsd_proc_read(struct svc_rqst *rqstp)
{
	struct readargs_wrapper *argp = rqstp->rq_argp;
	struct readres *resp = rqstp->rq_resp;
	unsigned long count = argp->xdrgen.count;
	u32 offset = argp->xdrgen.offset;
	struct svc_fh *fhp = &argp->fh;
	struct kstat stat;
	u32 eof;

	nfsd_fhandle_to_svc_fh(fhp, &argp->xdrgen.file);
	count = min_t(u32, count, NFS_MAXDATA);
	count = min_t(u32, count, rqstp->rq_res.buflen);

	/*
	 * 19 is 1 word for status, 17 words for fattr, and 1 word
	 * for the byte count.
	 */
	svc_reserve_auth(rqstp, (19 << 2) + count + 4);
	resp->status = nfsd_read(rqstp, fhp, offset, &count, &eof);

	if (resp->status == nfs_ok) {
		struct readresok *resok = &resp->u.readresok;

		resok->data.len = count;
		resp->status = fh_getattr(fhp, &stat);
		if (resp->status == nfs_ok)
			nfsd_stat_to_fattr(rqstp, &resok->attributes, &stat,
					   fhp);
	}
	if (resp->status == nfserr_jukebox)
		set_bit(RQ_DROPME, &rqstp->rq_flags);
	if (resp->status != nfs_ok)
		resp->status = nfsd_map_io_status(resp->status);

	fh_put(fhp);
	return rpc_success;
}

/**
 * nfsd_proc_writecache - WRITECACHE: To-client write cache
 * @rqstp: RPC transaction context
 *
 * Reserved.
 *
 * Return:
 *   %rpc_success:		RPC executed successfully
 *
 * RPC synopsis:
 *   void NFSPROC_WRITECACHE(void) = 7;
 */
static __be32 nfsd_proc_writecache(struct svc_rqst *rqstp)
{
	return rpc_success;
}

/**
 * nfsd_proc_write - WRITE: Write to file
 * @rqstp: RPC transaction context
 *
 * Return:
 *   %rpc_success:		RPC executed successfully
 *
 * RPC synopsis:
 *   attrstat NFSPROC_WRITE(writeargs) = 8;
 */
static __be32 nfsd_proc_write(struct svc_rqst *rqstp)
{
	struct writeargs_wrapper *argp = rqstp->rq_argp;
	struct attrstat_wrapper *resp = rqstp->rq_resp;
	struct kstat *statp = &resp->stat;
	unsigned long count = argp->xdrgen.data.len;
	struct svc_fh *fhp = &argp->fh;

	nfsd_fhandle_to_svc_fh(fhp, &argp->xdrgen.file);

	resp->xdrgen.status = nfsd_write(rqstp, fhp, argp->xdrgen.offset,
					 &argp->xdrgen.data, &count,
					 IOCB_DSYNC, NULL);
	if (resp->xdrgen.status == nfs_ok) {
		resp->xdrgen.status = fh_getattr(fhp, statp);
		if (resp->xdrgen.status == nfs_ok)
			nfsd_stat_to_fattr(rqstp, &resp->xdrgen.u.attributes,
					   statp, fhp);
	}
	if (resp->xdrgen.status == nfserr_jukebox)
		set_bit(RQ_DROPME, &rqstp->rq_flags);
	if (resp->xdrgen.status != nfs_ok)
		resp->xdrgen.status = nfsd_map_io_status(resp->xdrgen.status);

	fh_put(fhp);
	return rpc_success;
}

/*
 * Implement NFSv2's unchecked CREATE semantics. Based on type bits in the
 * mode field, NFSv2 CREATE can create regular files, devices, and FIFOs.
 *
 * Caller must release @fhp and @resfhp.
 */
static __be32
nfsd_create_file(struct svc_rqst *rqstp, struct svc_fh *fhp,
		 struct svc_fh *resfhp, struct createargs_wrapper *argp)
{
	struct diropargs *where = &argp->xdrgen.where;
	struct iattr *attr = &argp->iattrs;
	dev_t rdev = 0, wanted = new_decode_dev(attr->ia_size);
	struct nfsd_attrs attrs = {
		.na_iattr	= attr,
	};
	struct svc_export *exp;
	struct dentry *dchild;
	struct inode *inode;
	int type, mode;
	__be32 status;
	int host_err;

	if (name_is_dot_dotdot(where->name.data, where->name.len))
		return nfserr_exist;

	status = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC);
	if (status != nfs_ok)
		return status;

	host_err = fh_want_write(fhp);
	if (host_err)
		return nfserrno(host_err);

	dchild = start_creating(&nop_mnt_idmap, fhp->fh_dentry,
				&QSTR_LEN(where->name.data, where->name.len));
	if (IS_ERR(dchild)) {
		status = nfserrno(PTR_ERR(dchild));
		goto out_drop_write;
	}
	/*
	 * If name exists we need to check for mountpoints
	 */
	exp = exp_get(fhp->fh_export);
	if (d_is_reg(dchild) &&
	    unlikely(nfsd_mountpoint(dchild, exp))) {
		status = nfsd_cross_mnt(rqstp, &dchild, &exp);
		if (status != nfs_ok) {
			exp_put(exp);
			goto out;
		}
	}

	status = fh_compose(resfhp, exp, dchild, fhp);
	exp_put(exp);
	if (!status && d_really_is_negative(dchild))
		status = nfserr_noent;
	if (status) {
		if (status != nfserr_noent)
			goto out;
		/*
		 * If the new file handle wasn't verified, we can't tell
		 * whether the file exists or not. Time to bail ...
		 */
		status = nfserr_acces;
		if (!resfhp->fh_dentry) {
			printk(KERN_WARNING
				"nfsd_proc_create: file handle not verified\n");
			goto out;
		}
	}

	inode = d_inode(resfhp->fh_dentry);

	/* Unfudge the mode bits */
	if (attr->ia_valid & ATTR_MODE) {
		type = attr->ia_mode & S_IFMT;
		mode = attr->ia_mode & ~S_IFMT;
		if (!type) {
			/* no type, so if target exists, assume same as that,
			 * else assume a file */
			if (inode) {
				type = inode->i_mode & S_IFMT;
				switch (type) {
				case S_IFCHR:
				case S_IFBLK:
					/* reserve rdev for later checking */
					rdev = inode->i_rdev;
					attr->ia_valid |= ATTR_SIZE;
					fallthrough;
				case S_IFIFO:
					/* this is probably a permission check..
					 * at least IRIX implements perm checking on
					 *   echo thing > device-special-file-or-pipe
					 * by doing a CREATE with type==0
					 */
					status = nfsd_permission(
						&rqstp->rq_cred,
						resfhp->fh_export,
						resfhp->fh_dentry,
						NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS);
					if (status && status != nfserr_rofs)
						goto out;
				}
			} else
				type = S_IFREG;
		}
	} else if (inode) {
		type = inode->i_mode & S_IFMT;
		mode = inode->i_mode & ~S_IFMT;
	} else {
		type = S_IFREG;
		mode = 0;	/* ??? */
	}

	attr->ia_valid |= ATTR_MODE;
	attr->ia_mode = mode;

	/* Special treatment for non-regular files according to the
	 * gospel of sun micro
	 */
	if (type != S_IFREG) {
		if (type != S_IFBLK && type != S_IFCHR) {
			rdev = 0;
		} else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) {
			/* If you think you've seen the worst, grok this. */
			type = S_IFIFO;
		} else {
			/* Okay, char or block special */
			if (!rdev)
				rdev = wanted;
		}

		/* we've used the SIZE information, so discard it */
		attr->ia_valid &= ~ATTR_SIZE;

		/* Make sure the type and device matches */
		status = nfserr_exist;
		if (inode && inode_wrong_type(inode, type))
			goto out;
	}

	status = nfs_ok;
	if (!inode) {
		/* File doesn't exist. Create it and set attrs */
		status = nfsd_create_locked(rqstp, fhp, &attrs, type,
					    rdev, resfhp);
		/* nfsd_create_locked() unlocked the parent */
		dput(dchild);
		goto out_drop_write;
	} else if (type == S_IFREG) {
		dprintk("nfsd:   existing %s, valid=%x, size=%ld\n",
			where->name.data, attr->ia_valid, (long)attr->ia_size);
		/* File already exists. We ignore all attributes except
		 * size, so that creat() behaves exactly like
		 * open(..., O_CREAT|O_TRUNC|O_WRONLY).
		 */
		attr->ia_valid &= ATTR_SIZE;
		if (attr->ia_valid)
			status = nfsd_setattr(rqstp, resfhp, &attrs, NULL);
	}

out:
	end_creating(dchild);
out_drop_write:
	fh_drop_write(fhp);
	return status;
}

/**
 * nfsd_proc_create - CREATE: Create a file
 * @rqstp: RPC transaction context
 *
 * Return:
 *   %rpc_success:		RPC executed successfully
 *
 * RPC synopsis:
 *   diropres NFSPROC_CREATE(createargs) = 9;
 */
static __be32 nfsd_proc_create(struct svc_rqst *rqstp)
{
	struct createargs_wrapper *argp = rqstp->rq_argp;
	struct diropres_wrapper *resp = rqstp->rq_resp;
	struct kstat *statp = &resp->stat;
	struct svc_fh *dirfhp = &argp->fh;
	struct svc_fh *fhp = &resp->fh;

	nfsd_fhandle_to_svc_fh(dirfhp, &argp->xdrgen.where.dir);
	fh_init(fhp, NFS_FHSIZE);
	if (!nfsd_sattr_to_iattr(rqstp, &argp->iattrs, &argp->xdrgen.attributes)) {
		resp->xdrgen.status = nfserr_io;
		goto out;
	}

	resp->xdrgen.status = nfsd_create_file(rqstp, dirfhp, fhp, argp);
	if (resp->xdrgen.status != nfs_ok)
		goto out;
	resp->xdrgen.status = fh_getattr(fhp, statp);

out:
	if (resp->xdrgen.status == nfs_ok) {
		nfsd_svc_fh_to_fhandle(&resp->xdrgen.u.diropok.file, fhp);
		nfsd_stat_to_fattr(rqstp, &resp->xdrgen.u.diropok.attributes,
				   statp, fhp);
	} else {
		resp->xdrgen.status = nfsd_map_status(resp->xdrgen.status);
	}

	fh_put(fhp);
	fh_put(dirfhp);
	return rpc_success;
}

/**
 * nfsd_proc_remove - REMOVE: Remove a file
 * @rqstp: RPC transaction context
 *
 * Return:
 *   %rpc_success:		RPC executed successfully
 *
 * RPC synopsis:
 *   nfsstat NFSPROC_REMOVE(diropargs) = 10;
 */
static __be32 nfsd_proc_remove(struct svc_rqst *rqstp)
{
	struct diropargs_wrapper *argp = rqstp->rq_argp;
	struct diropargs *object = &argp->xdrgen;
	nfsstat *resp = rqstp->rq_resp;
	struct svc_fh *fhp = &argp->fh;

	nfsd_fhandle_to_svc_fh(fhp, &object->dir);

	/* Unlink. -S_IFDIR means file must not be a directory */
	*resp = nfsd_unlink(rqstp, fhp, -S_IFDIR,
			    (char *)object->name.data, object->name.len);
	*resp = nfsd_map_status(*resp);

	fh_put(fhp);
	return rpc_success;
}

/**
 * nfsd_proc_rename - RENAME: Rename a file or directory
 * @rqstp: RPC transaction context
 *
 * Return:
 *   %rpc_success:		RPC executed successfully
 *
 * RPC synopsis:
 *   nfsstat NFSPROC_RENAME(renameargs) = 11;
 */
static __be32 nfsd_proc_rename(struct svc_rqst *rqstp)
{
	struct renameargs_wrapper *argp = rqstp->rq_argp;
	struct diropargs *from = &argp->xdrgen.from;
	struct diropargs *to = &argp->xdrgen.to;
	nfsstat *resp = rqstp->rq_resp;
	struct svc_fh *ffhp = &argp->ffh;
	struct svc_fh *tfhp = &argp->tfh;

	nfsd_fhandle_to_svc_fh(ffhp, &from->dir);
	nfsd_fhandle_to_svc_fh(tfhp, &to->dir);

	*resp = nfsd_rename(rqstp, ffhp, (char *)from->name.data,
			    from->name.len, tfhp, (char *)to->name.data,
			    to->name.len);
	*resp = nfsd_map_status(*resp);

	fh_put(ffhp);
	fh_put(tfhp);
	return rpc_success;
}

/**
 * nfsd_proc_link - LINK: Create Link to an object
 * @rqstp: RPC transaction context
 *
 * Return:
 *   %rpc_success:		RPC executed successfully
 *
 * RPC synopsis:
 *   nfsstat NFSPROC_LINK(linkargs) = 12;
 */
static __be32 nfsd_proc_link(struct svc_rqst *rqstp)
{
	struct linkargs_wrapper *argp = rqstp->rq_argp;
	struct diropargs *to = &argp->xdrgen.to;
	nfsstat *resp = rqstp->rq_resp;
	struct svc_fh *ffhp = &argp->ffh;
	struct svc_fh *tfhp = &argp->tfh;

	nfsd_fhandle_to_svc_fh(ffhp, &argp->xdrgen.from);
	nfsd_fhandle_to_svc_fh(tfhp, &to->dir);

	*resp = nfsd_link(rqstp, tfhp, (char *)to->name.data, to->name.len,
			  ffhp);
	*resp = nfsd_map_status(*resp);

	fh_put(ffhp);
	fh_put(tfhp);
	return rpc_success;
}

static char *nfsd_symlink_target(const struct xdr_buf *to)
{
	char *result;

	result = kmalloc(to->len + 1, GFP_KERNEL);
	if (!result)
		return ERR_PTR(-ESERVERFAULT);
	/* The target can span the receive buffer's head, pages, and tail */
	if (read_bytes_from_xdr_buf(to, 0, result, to->len)) {
		kfree(result);
		return ERR_PTR(-ESERVERFAULT);
	}
	result[to->len] = '\0';

	/* The VFS rejects a pathname that contains a NUL byte */
	if (strlen(result) != to->len) {
		kfree(result);
		return ERR_PTR(-EINVAL);
	}
	return result;
}

/**
 * nfsd_proc_symlink - SYMLINK: Create a symbolic link
 * @rqstp: RPC transaction context
 *
 * Return:
 *   %rpc_success:		RPC executed successfully
 *
 * RPC synopsis:
 *   nfsstat NFSPROC_SYMLINK(symlinkargs) = 13;
 */
static __be32 nfsd_proc_symlink(struct svc_rqst *rqstp)
{
	struct symlinkargs_wrapper *argp = rqstp->rq_argp;
	struct diropargs *from = &argp->xdrgen.from;
	struct xdr_buf *to = &argp->xdrgen.to;
	nfsstat *resp = rqstp->rq_resp;
	struct svc_fh *fhp = &argp->ffh;
	struct nfsd_attrs nattrs = {
		.na_iattr	= &argp->iattrs,
	};
	struct svc_fh newfh;
	char *tname;

	nfsd_fhandle_to_svc_fh(fhp, &from->dir);
	if (!nfsd_sattr_to_iattr(rqstp, &argp->iattrs, &argp->xdrgen.attributes)) {
		*resp = nfserr_io;
		goto out;
	}

	tname = nfsd_symlink_target(to);
	if (IS_ERR(tname)) {
		*resp = nfserrno(PTR_ERR(tname));
		goto out;
	}

	fh_init(&newfh, NFS_FHSIZE);
	*resp = nfsd_symlink(rqstp, fhp, (char *)from->name.data, from->name.len,
			     tname, &nattrs, &newfh);
	kfree(tname);
	*resp = nfsd_map_status(*resp);

	fh_put(&newfh);
out:
	fh_put(fhp);
	return rpc_success;
}

/**
 * nfsd_proc_mkdir - MKDIR: Create a directory
 * @rqstp: RPC transaction context
 *
 * Return:
 *   %rpc_success:		RPC executed successfully
 *
 * RPC synopsis:
 *   diropres NFSPROC_MKDIR(createargs) = 14;
 */
static __be32 nfsd_proc_mkdir(struct svc_rqst *rqstp)
{
	struct createargs_wrapper *argp = rqstp->rq_argp;
	struct diropargs *where = &argp->xdrgen.where;
	struct diropres_wrapper *resp = rqstp->rq_resp;
	struct kstat *statp = &resp->stat;
	struct svc_fh *dirfhp = &argp->fh;
	struct svc_fh *fhp = &resp->fh;
	struct nfsd_attrs nattrs = {
		.na_iattr	= &argp->iattrs,
	};

	nfsd_fhandle_to_svc_fh(dirfhp, &where->dir);
	fh_init(fhp, NFS_FHSIZE);
	if (!nfsd_sattr_to_iattr(rqstp, &argp->iattrs, &argp->xdrgen.attributes)) {
		resp->xdrgen.status = nfserr_io;
		goto out;
	}

	argp->iattrs.ia_valid &= ~ATTR_SIZE;
	resp->xdrgen.status = nfsd_create(rqstp, dirfhp,
					  (char *)where->name.data,
					  where->name.len, &nattrs,
					  S_IFDIR, 0, fhp);
	if (resp->xdrgen.status != nfs_ok)
		goto out;
	resp->xdrgen.status = fh_getattr(fhp, statp);

out:
	if (resp->xdrgen.status == nfs_ok) {
		nfsd_svc_fh_to_fhandle(&resp->xdrgen.u.diropok.file, fhp);
		nfsd_stat_to_fattr(rqstp, &resp->xdrgen.u.diropok.attributes,
				   statp, fhp);
	} else {
		resp->xdrgen.status = nfsd_map_status(resp->xdrgen.status);
	}

	fh_put(fhp);
	fh_put(dirfhp);
	return rpc_success;
}

/**
 * nfsd_proc_rmdir - RMDIR: Remove a directory
 * @rqstp: RPC transaction context
 *
 * Return:
 *   %rpc_success:		RPC executed successfully
 *
 * RPC synopsis:
 *   nfsstat NFSPROC_RMDIR(diropargs) = 15;
 */
static __be32 nfsd_proc_rmdir(struct svc_rqst *rqstp)
{
	struct diropargs_wrapper *argp = rqstp->rq_argp;
	struct diropargs *object = &argp->xdrgen;
	nfsstat *resp = rqstp->rq_resp;
	struct svc_fh *fhp = &argp->fh;

	nfsd_fhandle_to_svc_fh(fhp, &object->dir);

	/* Unlink. S_IFDIR means file must be a directory */
	*resp = nfsd_unlink(rqstp, fhp, S_IFDIR,
			    (char *)object->name.data, object->name.len);
	*resp = nfsd_map_status(*resp);

	fh_put(fhp);
	return rpc_success;
}

/**
 * nfsd_proc_readdir - READDIR: Read from directory
 * @rqstp: RPC transaction context
 *
 * The directory is opened here so the reply status reflects any open
 * error before the generated encoder writes the status word.  The
 * entry list is streamed from the reply wrapper's directory reader
 * during encode; nfssvc_release_readdirres() closes the reader and
 * releases the file handle.
 *
 * Return:
 *   %rpc_success:		RPC executed successfully
 *
 * RPC synopsis:
 *   readdirres NFSPROC_READDIR(readdirargs) = 16;
 */
static __be32 nfsd_proc_readdir(struct svc_rqst *rqstp)
{
	struct readdirargs *argp = rqstp->rq_argp;
	struct readdirres_wrapper *resp = rqstp->rq_resp;
	loff_t offset = be32_to_cpup((__be32 *)argp->cookie);
	struct svc_fh *fhp = &resp->fh;
	__be32 status;

	nfsd_fhandle_to_svc_fh(fhp, &argp->dir);
	trace_nfsd_vfs_readdir(rqstp, fhp, argp->count, offset);

	resp->count = argp->count;
	status = nfsd_readdir_open(rqstp, fhp, &offset, &resp->iter);

	resp->xdrgen.status = nfsd_map_status(status);
	return rpc_success;
}

/**
 * nfsd_proc_statfs - STATFS: Get filesystem attributes
 * @rqstp: RPC transaction context
 *
 * Return:
 *   %rpc_success:		RPC executed successfully
 *
 * RPC synopsis:
 *   statfsres NFSPROC_STATFS(fhandle) = 17;
 */
static __be32 nfsd_proc_statfs(struct svc_rqst *rqstp)
{
	struct fhandle_wrapper *argp = rqstp->rq_argp;
	struct statfsres_wrapper *resp = rqstp->rq_resp;
	struct kstatfs *stat = &resp->stats;
	struct svc_fh *fhp = &argp->fh;

	nfsd_fhandle_to_svc_fh(fhp, &argp->xdrgen);

	resp->xdrgen.status = nfsd_statfs(rqstp, fhp, stat,
					  NFSD_MAY_BYPASS_GSS_ON_ROOT);
	if (resp->xdrgen.status == nfs_ok) {
		struct info *resinfo = &resp->xdrgen.u.info;

		resinfo->tsize = NFS_MAXDATA;
		resinfo->bsize = stat->f_bsize;
		resinfo->blocks = stat->f_blocks;
		resinfo->bfree = stat->f_bfree;
		resinfo->bavail = stat->f_bavail;
	} else {
		resp->xdrgen.status = nfsd_map_status(resp->xdrgen.status);
	}

	fh_put(fhp);
	return rpc_success;
}

/*
 * NFSv2 Server procedures.
 * Only the results of non-idempotent operations are cached.
 */

#define ST 1		/* status */
#define FH 8		/* filehandle */
#define	AT 18		/* attributes */

static const struct svc_procedure nfsd_procedures2[18] = {
	[NFSPROC_NULL] = {
		.pc_func	= nfsd_proc_null,
		.pc_decode	= xdrgen_svc_decode_void,
		.pc_encode	= xdrgen_svc_encode_void,
		.pc_argsize	= XDR_void,
		.pc_argzero	= 0,
		.pc_ressize	= 0,
		.pc_cachetype	= RC_NOCACHE,
		.pc_xdrressize	= XDR_void,
		.pc_name	= "NULL",
	},
	[NFSPROC_GETATTR] = {
		.pc_func	= nfsd_proc_getattr,
		.pc_decode	= nfs_svc_decode_fhandle,
		.pc_encode	= nfs_svc_encode_attrstat,
		.pc_argsize	= sizeof(struct fhandle_wrapper),
		.pc_argzero	= 0,
		.pc_ressize	= sizeof(struct attrstat_wrapper),
		.pc_cachetype	= RC_NOCACHE,
		.pc_xdrressize	= NFS2_attrstat_sz,
		.pc_name	= "GETATTR",
	},
	[NFSPROC_SETATTR] = {
		.pc_func	= nfsd_proc_setattr,
		.pc_decode	= nfs_svc_decode_sattrargs,
		.pc_encode	= nfs_svc_encode_attrstat,
		.pc_argsize	= sizeof(struct sattrargs_wrapper),
		.pc_argzero	= 0,
		.pc_ressize	= sizeof(struct attrstat_wrapper),
		.pc_cachetype	= RC_REPLBUFF,
		.pc_xdrressize	= NFS2_attrstat_sz,
		.pc_name	= "SETATTR",
	},
	[NFSPROC_ROOT] = {
		.pc_func	= nfsd_proc_root,
		.pc_decode	= xdrgen_svc_decode_void,
		.pc_encode	= xdrgen_svc_encode_void,
		.pc_argsize	= XDR_void,
		.pc_argzero	= 0,
		.pc_ressize	= 0,
		.pc_cachetype	= RC_NOCACHE,
		.pc_xdrressize	= XDR_void,
		.pc_name	= "ROOT",
	},
	[NFSPROC_LOOKUP] = {
		.pc_func	= nfsd_proc_lookup,
		.pc_decode	= nfs_svc_decode_diropargs,
		.pc_encode	= nfs_svc_encode_diropres,
		.pc_argsize	= sizeof(struct diropargs_wrapper),
		.pc_argzero	= 0,
		.pc_ressize	= sizeof(struct diropres_wrapper),
		.pc_cachetype	= RC_NOCACHE,
		.pc_xdrressize	= NFS2_diropres_sz,
		.pc_name	= "LOOKUP",
	},
	[NFSPROC_READLINK] = {
		.pc_func	= nfsd_proc_readlink,
		.pc_decode	= nfs_svc_decode_fhandle,
		.pc_encode	= nfs_svc_encode_readlinkres,
		.pc_argsize	= sizeof(struct fhandle_wrapper),
		.pc_argzero	= 0,
		.pc_ressize	= sizeof(struct readlinkres),
		.pc_cachetype	= RC_NOCACHE,
		.pc_xdrressize	= NFS2_readlinkres_sz,
		.pc_name	= "READLINK",
	},
	[NFSPROC_READ] = {
		.pc_func	= nfsd_proc_read,
		.pc_decode	= nfs_svc_decode_readargs,
		.pc_encode	= nfs_svc_encode_readres,
		.pc_argsize	= sizeof(struct readargs_wrapper),
		.pc_argzero	= 0,
		.pc_ressize	= sizeof(struct readres),
		.pc_cachetype	= RC_NOCACHE,
		.pc_xdrressize	= NFS2_readres_sz,
		.pc_name	= "READ",
	},
	[NFSPROC_WRITECACHE] = {
		.pc_func	= nfsd_proc_writecache,
		.pc_decode	= xdrgen_svc_decode_void,
		.pc_encode	= xdrgen_svc_encode_void,
		.pc_argsize	= XDR_void,
		.pc_argzero	= 0,
		.pc_ressize	= 0,
		.pc_cachetype	= RC_NOCACHE,
		.pc_xdrressize	= XDR_void,
		.pc_name	= "WRITECACHE",
	},
	[NFSPROC_WRITE] = {
		.pc_func	= nfsd_proc_write,
		.pc_decode	= nfs_svc_decode_writeargs,
		.pc_encode	= nfs_svc_encode_attrstat,
		.pc_argsize	= sizeof(struct writeargs_wrapper),
		.pc_argzero	= 0,
		.pc_ressize	= sizeof(struct attrstat_wrapper),
		.pc_cachetype	= RC_REPLBUFF,
		.pc_xdrressize	= NFS2_attrstat_sz,
		.pc_name	= "WRITE",
	},
	[NFSPROC_CREATE] = {
		.pc_func	= nfsd_proc_create,
		.pc_decode	= nfs_svc_decode_createargs,
		.pc_encode	= nfs_svc_encode_diropres,
		.pc_argsize	= sizeof(struct createargs_wrapper),
		.pc_argzero	= 0,
		.pc_ressize	= sizeof(struct diropres_wrapper),
		.pc_cachetype	= RC_REPLBUFF,
		.pc_xdrressize	= NFS2_diropres_sz,
		.pc_name	= "CREATE",
	},
	[NFSPROC_REMOVE] = {
		.pc_func	= nfsd_proc_remove,
		.pc_decode	= nfs_svc_decode_diropargs,
		.pc_encode	= nfs_svc_encode_nfsstat,
		.pc_argsize	= sizeof(struct diropargs_wrapper),
		.pc_argzero	= 0,
		.pc_ressize	= sizeof(nfsstat),
		.pc_cachetype	= RC_REPLSTAT,
		.pc_xdrressize	= NFS2_nfsstat_sz,
		.pc_name	= "REMOVE",
	},
	[NFSPROC_RENAME] = {
		.pc_func	= nfsd_proc_rename,
		.pc_decode	= nfs_svc_decode_renameargs,
		.pc_encode	= nfs_svc_encode_nfsstat,
		.pc_argsize	= sizeof(struct renameargs_wrapper),
		.pc_argzero	= 0,
		.pc_ressize	= sizeof(nfsstat),
		.pc_cachetype	= RC_REPLSTAT,
		.pc_xdrressize	= NFS2_nfsstat_sz,
		.pc_name	= "RENAME",
	},
	[NFSPROC_LINK] = {
		.pc_func	= nfsd_proc_link,
		.pc_decode	= nfs_svc_decode_linkargs,
		.pc_encode	= nfs_svc_encode_nfsstat,
		.pc_argsize	= sizeof(struct linkargs_wrapper),
		.pc_argzero	= 0,
		.pc_ressize	= sizeof(nfsstat),
		.pc_cachetype	= RC_REPLSTAT,
		.pc_xdrressize	= NFS2_nfsstat_sz,
		.pc_name	= "LINK",
	},
	[NFSPROC_SYMLINK] = {
		.pc_func	= nfsd_proc_symlink,
		.pc_decode	= nfs_svc_decode_symlinkargs,
		.pc_encode	= nfs_svc_encode_nfsstat,
		.pc_argsize	= sizeof(struct symlinkargs_wrapper),
		.pc_argzero	= 0,
		.pc_ressize	= sizeof(nfsstat),
		.pc_cachetype	= RC_REPLSTAT,
		.pc_xdrressize	= NFS2_nfsstat_sz,
		.pc_name	= "SYMLINK",
	},
	[NFSPROC_MKDIR] = {
		.pc_func	= nfsd_proc_mkdir,
		.pc_decode	= nfs_svc_decode_createargs,
		.pc_encode	= nfs_svc_encode_diropres,
		.pc_argsize	= sizeof(struct createargs_wrapper),
		.pc_argzero	= 0,
		.pc_ressize	= sizeof(struct diropres_wrapper),
		.pc_cachetype	= RC_REPLBUFF,
		.pc_xdrressize	= NFS2_diropres_sz,
		.pc_name	= "MKDIR",
	},
	[NFSPROC_RMDIR] = {
		.pc_func	= nfsd_proc_rmdir,
		.pc_decode	= nfs_svc_decode_diropargs,
		.pc_encode	= nfs_svc_encode_nfsstat,
		.pc_argsize	= sizeof(struct diropargs_wrapper),
		.pc_argzero	= 0,
		.pc_ressize	= sizeof(nfsstat),
		.pc_cachetype	= RC_REPLSTAT,
		.pc_xdrressize	= NFS2_nfsstat_sz,
		.pc_name	= "RMDIR",
	},
	[NFSPROC_READDIR] = {
		.pc_func	= nfsd_proc_readdir,
		.pc_decode	= nfs_svc_decode_readdirargs,
		.pc_encode	= nfs_svc_encode_readdirres,
		.pc_release	= nfssvc_release_readdirres,
		.pc_argsize	= sizeof(struct readdirargs),
		.pc_argzero	= 0,
		.pc_ressize	= sizeof(struct readdirres_wrapper),
		.pc_cachetype	= RC_NOCACHE,
		.pc_name	= "READDIR",
	},
	[NFSPROC_STATFS] = {
		.pc_func	= nfsd_proc_statfs,
		.pc_decode	= nfs_svc_decode_fhandle,
		.pc_encode	= nfs_svc_encode_statfsres,
		.pc_argsize	= sizeof(struct fhandle_wrapper),
		.pc_argzero	= 0,
		.pc_ressize	= sizeof(struct statfsres_wrapper),
		.pc_cachetype	= RC_NOCACHE,
		.pc_xdrressize	= NFS2_statfsres_sz,
		.pc_name	= "STATFS",
	},
};

/*
 * Storage requirements for XDR arguments and results.
 */
union nfsd_xdrstore {
	struct fhandle_wrapper		fhandle;
	struct sattrargs_wrapper	sattrargs;
	struct diropargs_wrapper	diropargs;
	struct readargs_wrapper		readargs;
	struct writeargs_wrapper	writeargs;
	struct createargs_wrapper	createargs;
	struct renameargs_wrapper	renameargs;
	struct linkargs_wrapper		linkargs;
	struct symlinkargs_wrapper	symlinkargs;
	struct readdirargs	readdirargs;
	struct attrstat_wrapper		attrstat;
	struct diropres_wrapper		diropres;
	struct readlinkres	readlinkres;
	struct readres		readres;
	struct readdirres_wrapper	readdirres;
	struct statfsres_wrapper	statfsres;
};

const struct svc_version nfsd_version2 = {
	.vs_vers	= 2,
	.vs_nproc	= ARRAY_SIZE(nfsd_procedures2),
	.vs_proc	= nfsd_procedures2,
	.vs_dispatch	= nfsd_dispatch,
	.vs_xdrsize	= sizeof(union nfsd_xdrstore),
};