/*
   * linux/fs/nfsd/auth.c
   *
   * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
   */
  
  #include <linux/types.h>
  #include <linux/sched.h>
  #include <linux/sunrpc/svc.h>
  #include <linux/sunrpc/svcauth.h>
  #include <linux/nfsd/nfsd.h>

  #include <linux/nfsd/export.h>

  
  #define	CAP_NFSD_MASK (CAP_FS_MASK|CAP_TO_MASK(CAP_SYS_RESOURCE))

  int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp)

  {
  	struct exp_flavor_info *f;
  	struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
  
  	for (f = exp->ex_flavors; f < end; f++) {
  		if (f->pseudoflavor == rqstp->rq_flavor)
  			return f->flags;
  	}
  	return exp->ex_flags;
  
  }

  int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp)
  {

  	struct svc_cred	cred = rqstp->rq_cred;

  	int i;

  	int flags = nfsexp_flags(rqstp, exp);

  	int ret;

  	if (flags & NFSEXP_ALLSQUASH) {

  		cred.cr_uid = exp->ex_anon_uid;
  		cred.cr_gid = exp->ex_anon_gid;
  		cred.cr_group_info = groups_alloc(0);

  	} else if (flags & NFSEXP_ROOTSQUASH) {

  		struct group_info *gi;

  		if (!cred.cr_uid)
  			cred.cr_uid = exp->ex_anon_uid;
  		if (!cred.cr_gid)
  			cred.cr_gid = exp->ex_anon_gid;
  		gi = groups_alloc(cred.cr_group_info->ngroups);

  		if (gi)

  			for (i = 0; i < cred.cr_group_info->ngroups; i++) {
  				if (!GROUP_AT(cred.cr_group_info, i))

  					GROUP_AT(gi, i) = exp->ex_anon_gid;
  				else

  					GROUP_AT(gi, i) = GROUP_AT(cred.cr_group_info, i);

  			}

  		cred.cr_group_info = gi;
  	} else
  		get_group_info(cred.cr_group_info);

  	if (cred.cr_uid != (uid_t) -1)
  		current->fsuid = cred.cr_uid;

  	else
  		current->fsuid = exp->ex_anon_uid;

  	if (cred.cr_gid != (gid_t) -1)
  		current->fsgid = cred.cr_gid;

  	else
  		current->fsgid = exp->ex_anon_gid;

  	if (!cred.cr_group_info)

  		return -ENOMEM;

  	ret = set_current_groups(cred.cr_group_info);
  	put_group_info(cred.cr_group_info);
  	if ((cred.cr_uid)) {

  		cap_t(current->cap_effective) &= ~CAP_NFSD_MASK;
  	} else {
  		cap_t(current->cap_effective) |= (CAP_NFSD_MASK &
  						  current->cap_permitted);
  	}
  	return ret;
  }