/*

   * Process version 3 NFSACL requests.
   *
   * Copyright (C) 2002-2003 Andreas Gruenbacher <agruen@suse.de>
   */

  #include "nfsd.h"
  /* FIXME: nfsacl.h is a broken header */

  #include <linux/nfsacl.h>

  #include <linux/gfp.h>

  #include "cache.h"
  #include "xdr3.h"

  #include "vfs.h"

  
  #define RETURN_STATUS(st)	{ resp->status = (st); return (st); }
  
  /*
   * NULL call.
   */

  static __be32

  nfsd3_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
  {
  	return nfs_ok;
  }
  
  /*
   * Get the Access and/or Default ACL of a file.
   */

  static __be32 nfsd3_proc_getacl(struct svc_rqst * rqstp,

  		struct nfsd3_getaclargs *argp, struct nfsd3_getaclres *resp)
  {

  	struct posix_acl *acl;

  	struct inode *inode;
  	svc_fh *fh;

  	__be32 nfserr = 0;

  
  	fh = fh_copy(&resp->fh, &argp->fh);

  	nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
  	if (nfserr)

  		RETURN_STATUS(nfserr);

  	inode = d_inode(fh->fh_dentry);

  	if (argp->mask & ~NFS_ACL_MASK)

  		RETURN_STATUS(nfserr_inval);
  	resp->mask = argp->mask;
  
  	if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {

  		acl = get_acl(inode, ACL_TYPE_ACCESS);

  		if (acl == NULL) {
  			/* Solaris returns the inode's minimum ACL. */

  			acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
  		}

  		if (IS_ERR(acl)) {
  			nfserr = nfserrno(PTR_ERR(acl));
  			goto fail;
  		}

  		resp->acl_access = acl;
  	}
  	if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) {
  		/* Check how Solaris handles requests for the Default ACL
  		   of a non-directory! */

  		acl = get_acl(inode, ACL_TYPE_DEFAULT);

  		if (IS_ERR(acl)) {

  			nfserr = nfserrno(PTR_ERR(acl));
  			goto fail;

  		}
  		resp->acl_default = acl;
  	}
  
  	/* resp->acl_{access,default} are released in nfs3svc_release_getacl. */
  	RETURN_STATUS(0);
  
  fail:
  	posix_acl_release(resp->acl_access);
  	posix_acl_release(resp->acl_default);
  	RETURN_STATUS(nfserr);
  }
  
  /*
   * Set the Access and/or Default ACL of a file.
   */

  static __be32 nfsd3_proc_setacl(struct svc_rqst * rqstp,

  		struct nfsd3_setaclargs *argp,
  		struct nfsd3_attrstat *resp)
  {

  	struct inode *inode;

  	svc_fh *fh;

  	__be32 nfserr = 0;

  	int error;

  
  	fh = fh_copy(&resp->fh, &argp->fh);

  	nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);

  	if (nfserr)
  		goto out;

  	inode = d_inode(fh->fh_dentry);

  	error = fh_want_write(fh);
  	if (error)
  		goto out_errno;

  	fh_lock(fh);
  
  	error = set_posix_acl(inode, ACL_TYPE_ACCESS, argp->acl_access);

  	if (error)

  		goto out_drop_lock;
  	error = set_posix_acl(inode, ACL_TYPE_DEFAULT, argp->acl_default);

  out_drop_lock:
  	fh_unlock(fh);

  	fh_drop_write(fh);
  out_errno:
  	nfserr = nfserrno(error);
  out:

  	/* argp->acl_{access,default} may have been allocated in
  	   nfs3svc_decode_setaclargs. */
  	posix_acl_release(argp->acl_access);
  	posix_acl_release(argp->acl_default);
  	RETURN_STATUS(nfserr);
  }
  
  /*
   * XDR decode functions
   */

  static int nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p,

  		struct nfsd3_getaclargs *args)
  {

  	p = nfs3svc_decode_fh(p, &args->fh);
  	if (!p)

  		return 0;
  	args->mask = ntohl(*p); p++;
  
  	return xdr_argsize_check(rqstp, p);
  }

  static int nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p,

  		struct nfsd3_setaclargs *args)
  {
  	struct kvec *head = rqstp->rq_arg.head;
  	unsigned int base;
  	int n;

  	p = nfs3svc_decode_fh(p, &args->fh);
  	if (!p)

  		return 0;
  	args->mask = ntohl(*p++);

  	if (args->mask & ~NFS_ACL_MASK ||

  	    !xdr_argsize_check(rqstp, p))
  		return 0;
  
  	base = (char *)p - (char *)head->iov_base;
  	n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
  			  (args->mask & NFS_ACL) ?
  			  &args->acl_access : NULL);
  	if (n > 0)
  		n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
  				  (args->mask & NFS_DFACL) ?
  				  &args->acl_default : NULL);
  	return (n > 0);
  }
  
  /*
   * XDR encode functions
   */
  
  /* GETACL */

  static int nfs3svc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p,

  		struct nfsd3_getaclres *resp)
  {
  	struct dentry *dentry = resp->fh.fh_dentry;
  
  	p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);

  	if (resp->status == 0 && dentry && d_really_is_positive(dentry)) {
  		struct inode *inode = d_inode(dentry);

  		struct kvec *head = rqstp->rq_res.head;
  		unsigned int base;
  		int n;

  		int w;

  
  		*p++ = htonl(resp->mask);
  		if (!xdr_ressize_check(rqstp, p))
  			return 0;
  		base = (char *)p - (char *)head->iov_base;

  		rqstp->rq_res.page_len = w = nfsacl_size(
  			(resp->mask & NFS_ACL)   ? resp->acl_access  : NULL,
  			(resp->mask & NFS_DFACL) ? resp->acl_default : NULL);

  		while (w > 0) {

  			if (!*(rqstp->rq_next_page++))

  				return 0;
  			w -= PAGE_SIZE;
  		}
  
  		n = nfsacl_encode(&rqstp->rq_res, base, inode,
  				  resp->acl_access,
  				  resp->mask & NFS_ACL, 0);
  		if (n > 0)
  			n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
  					  resp->acl_default,
  					  resp->mask & NFS_DFACL,
  					  NFS_ACL_DEFAULT);
  		if (n <= 0)
  			return 0;
  	} else
  		if (!xdr_ressize_check(rqstp, p))
  			return 0;
  
  	return 1;
  }
  
  /* SETACL */

  static int nfs3svc_encode_setaclres(struct svc_rqst *rqstp, __be32 *p,

  		struct nfsd3_attrstat *resp)
  {
  	p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
  
  	return xdr_ressize_check(rqstp, p);
  }
  
  /*
   * XDR release functions
   */

  static int nfs3svc_release_getacl(struct svc_rqst *rqstp, __be32 *p,

  		struct nfsd3_getaclres *resp)
  {
  	fh_put(&resp->fh);
  	posix_acl_release(resp->acl_access);
  	posix_acl_release(resp->acl_default);
  	return 1;
  }
  
  #define nfs3svc_decode_voidargs		NULL
  #define nfs3svc_release_void		NULL
  #define nfsd3_setaclres			nfsd3_attrstat
  #define nfsd3_voidres			nfsd3_voidargs
  struct nfsd3_voidargs { int dummy; };
  
  #define PROC(name, argt, rest, relt, cache, respsize)	\
   { (svc_procfunc) nfsd3_proc_##name,		\
     (kxdrproc_t) nfs3svc_decode_##argt##args,	\
     (kxdrproc_t) nfs3svc_encode_##rest##res,	\
     (kxdrproc_t) nfs3svc_release_##relt,		\
     sizeof(struct nfsd3_##argt##args),		\
     sizeof(struct nfsd3_##rest##res),		\
     0,						\
     cache,					\
     respsize,					\
   }
  
  #define ST 1		/* status*/
  #define AT 21		/* attributes */
  #define pAT (1+AT)	/* post attributes - conditional */
  #define ACL (1+NFS_ACL_MAX_ENTRIES*3)  /* Access Control List */
  
  static struct svc_procedure		nfsd_acl_procedures3[] = {
    PROC(null,	void,		void,		void,	  RC_NOCACHE, ST),
    PROC(getacl,	getacl,		getacl,		getacl,	  RC_NOCACHE, ST+1+2*(1+ACL)),
    PROC(setacl,	setacl,		setacl,		fhandle,  RC_NOCACHE, ST+pAT),
  };
  
  struct svc_version	nfsd_acl_version3 = {
  		.vs_vers	= 3,
  		.vs_nproc	= 3,
  		.vs_proc	= nfsd_acl_procedures3,
  		.vs_dispatch	= nfsd_dispatch,
  		.vs_xdrsize	= NFS3_SVC_XDRSIZE,

  		.vs_hidden	= 0,

  };