/* 
   Unix SMB/CIFS implementation.

   POSIX NTVFS backend - write

   Copyright (C) Andrew Tridgell 2004

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"
#include "vfs_posix.h"


/*
  write to a file
*/
NTSTATUS pvfs_write(struct ntvfs_module_context *ntvfs,
		    struct smbsrv_request *req, union smb_write *wr)
{
	struct pvfs_state *pvfs = ntvfs->private_data;
	ssize_t ret;
	struct pvfs_file *f;
	NTSTATUS status;

	if (wr->generic.level != RAW_WRITE_WRITEX) {
		return ntvfs_map_write(req, wr, ntvfs);
	}

	f = pvfs_find_fd(pvfs, req, wr->writex.in.fnum);
	if (!f) {
		return NT_STATUS_INVALID_HANDLE;
	}

	if (f->handle->fd == -1) {
		return NT_STATUS_FILE_IS_A_DIRECTORY;
	}

	if (!(f->access_mask & SA_RIGHT_FILE_WRITE_APPEND)) {
		return NT_STATUS_ACCESS_VIOLATION;
	}

	status = pvfs_check_lock(pvfs, f, req->smbpid, 
				 wr->writex.in.offset,
				 wr->writex.in.count,
				 WRITE_LOCK);
	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}
	
	ret = pwrite(f->handle->fd, 
		     wr->writex.in.data, 
		     wr->writex.in.count,
		     wr->writex.in.offset);
	if (ret == -1) {
		if (errno == EFBIG) {
			return NT_STATUS_INVALID_PARAMETER;
		}
		return map_nt_error_from_unix(errno);
	}

	f->handle->seek_offset = wr->writex.in.offset + ret;
	
	wr->writex.out.nwritten = ret;
	wr->writex.out.remaining = 0; /* should fill this in? */
	
	return NT_STATUS_OK;
}