/* 
   Unix SMB/CIFS implementation.

   simpler Samba VFS filesystem backend for clients which support the
   CIFS Unix Extensions or newer CIFS POSIX protocol extensions

   Copyright (C) Andrew Tridgell 2003
   Copyright (C) Steve French 2006

   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 3 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, see <http://www.gnu.org/licenses/>.
*/
/*
  this implements a very simple NTVFS filesystem backend. 
  this backend largely ignores the POSIX -> CIFS mappings, just doing absolutely
  minimal work to give a working backend.
*/

#include "includes.h"
#include "system/dir.h"
#include "system/filesys.h"
#include "cifsposix.h"
#include "system/time.h"
#include "lib/util/dlinklist.h"
#include "ntvfs/ntvfs.h"
#include "ntvfs/cifs_posix_cli/proto.h"

#ifndef O_DIRECTORY
#define O_DIRECTORY 0
#endif

#define CHECK_READ_ONLY(req) do { if (share_bool_option(ntvfs->ctx->config, SHARE_READONLY, true)) return NT_STATUS_ACCESS_DENIED; } while (0)

/*
  connect to a share - used when a tree_connect operation comes
  in. For a disk based backend we needs to ensure that the base
  directory exists (tho it doesn't need to be accessible by the user,
  that comes later)
*/
static NTSTATUS cifspsx_connect(struct ntvfs_module_context *ntvfs,
			     struct ntvfs_request *req, const char *sharename)
{
	struct stat st;
	struct cifspsx_private *private;
	struct share_config *scfg = ntvfs->ctx->config;

	private = talloc(ntvfs, struct cifspsx_private);
	NT_STATUS_HAVE_NO_MEMORY(private);
	private->ntvfs = ntvfs;
	private->next_search_handle = 0;
	private->connectpath = talloc_strdup(private, share_string_option(scfg, SHARE_PATH, ""));
	private->open_files = NULL;
	private->search = NULL;

	/* the directory must exist */
	if (stat(private->connectpath, &st) != 0 || !S_ISDIR(st.st_mode)) {
		DEBUG(0,("'%s' is not a directory, when connecting to [%s]\n", 
			 private->connectpath, sharename));
		return NT_STATUS_BAD_NETWORK_NAME;
	}

	ntvfs->ctx->fs_type = talloc_strdup(ntvfs->ctx, "NTFS");
	NT_STATUS_HAVE_NO_MEMORY(ntvfs->ctx->fs_type);
	ntvfs->ctx->dev_type = talloc_strdup(ntvfs->ctx, "A:");
	NT_STATUS_HAVE_NO_MEMORY(ntvfs->ctx->dev_type);

	ntvfs->private_data = private;

	DEBUG(0,("WARNING: ntvfs cifs posix: connect to share [%s] with ROOT privileges!!!\n",sharename));

	return NT_STATUS_OK;
}

/*
  disconnect from a share
*/
static NTSTATUS cifspsx_disconnect(struct ntvfs_module_context *ntvfs)
{
	return NT_STATUS_OK;
}

/*
  find open file handle given fd
*/
static struct cifspsx_file *find_fd(struct cifspsx_private *private, struct ntvfs_handle *handle)
{
	struct cifspsx_file *f;
	void *p;

	p = ntvfs_handle_get_backend_data(handle, private->ntvfs);
	if (!p) return NULL;

	f = talloc_get_type(p, struct cifspsx_file);
	if (!f) return NULL;

	return f;
}

/*
  delete a file - the dirtype specifies the file types to include in the search. 
  The name can contain CIFS wildcards, but rarely does (except with OS/2 clients)
*/
static NTSTATUS cifspsx_unlink(struct ntvfs_module_context *ntvfs,
			    struct ntvfs_request *req,
			    union smb_unlink *unl)
{
	char *unix_path;

	CHECK_READ_ONLY(req);

	unix_path = cifspsx_unix_path(ntvfs, req, unl->unlink.in.pattern);

	/* ignoring wildcards ... */
	if (unlink(unix_path) == -1) {
		return map_nt_error_from_unix(errno);
	}

	return NT_STATUS_OK;
}


/*
  ioctl interface - we don't do any
*/
static NTSTATUS cifspsx_ioctl(struct ntvfs_module_context *ntvfs,
			   struct ntvfs_request *req, union smb_ioctl *io)
{
	return NT_STATUS_INVALID_PARAMETER;
}

/*
  check if a directory exists
*/
static NTSTATUS cifspsx_chkpath(struct ntvfs_module_context *ntvfs,
			     struct ntvfs_request *req,
			     union smb_chkpath *cp)
{
	char *unix_path;
	struct stat st;

	unix_path = cifspsx_unix_path(ntvfs, req, cp->chkpath.in.path);

	if (stat(unix_path, &st) == -1) {
		return map_nt_error_from_unix(errno);
	}

	if (!S_ISDIR(st.st_mode)) {
		return NT_STATUS_NOT_A_DIRECTORY;
	}

	return NT_STATUS_OK;
}

/*
  build a file_id from a stat struct
*/
static uint64_t cifspsx_file_id(struct stat *st)
{
	uint64_t ret = st->st_ino;
	ret <<= 32;
	ret |= st->st_dev;
	return ret;
}

/*
  approximately map a struct stat to a generic fileinfo struct
*/
static NTSTATUS cifspsx_map_fileinfo(struct ntvfs_module_context *ntvfs,
				  struct ntvfs_request *req, union smb_fileinfo *info, 
				  struct stat *st, const char *unix_path)
{
	struct cifspsx_dir *dir = NULL;
	char *pattern = NULL;
	int i;
	const char *s, *short_name;

	s = strrchr(unix_path, '/');
	if (s) {
		short_name = s+1;
	} else {
		short_name = "";
	}

	asprintf(&pattern, "%s:*", unix_path);
	
	if (pattern) {
		dir = cifspsx_list_unix(req, req, pattern);
	}

	unix_to_nt_time(&info->generic.out.create_time, st->st_ctime);
	unix_to_nt_time(&info->generic.out.access_time, st->st_atime);
	unix_to_nt_time(&info->generic.out.write_time,  st->st_mtime);
	unix_to_nt_time(&info->generic.out.change_time, st->st_mtime);
	info->generic.out.alloc_size = st->st_size;
	info->generic.out.size = st->st_size;
	info->generic.out.attrib = cifspsx_unix_to_dos_attrib(st->st_mode);
	info->generic.out.alloc_size = st->st_blksize * st->st_blocks;
	info->generic.out.nlink = st->st_nlink;
	info->generic.out.directory = S_ISDIR(st->st_mode) ? 1 : 0;
	info->generic.out.file_id = cifspsx_file_id(st);
	/* REWRITE: TODO stuff in here */
	info->generic.out.delete_pending = 0;
	info->generic.out.ea_size = 0;
	info->generic.out.num_eas = 0;
	info->generic.out.fname.s = talloc_strdup(req, short_name);
	info->generic.out.alt_fname.s = talloc_strdup(req, short_name);
	info->generic.out.compressed_size = 0;
	info->generic.out.format = 0;
	info->generic.out.unit_shift = 0;
	info->generic.out.chunk_shift = 0;
	info->generic.out.cluster_shift = 0;
	
	info->generic.out.access_flags = 0;
	info->generic.out.position = 0;
	info->generic.out.mode = 0;
	info->generic.out.alignment_requirement = 0;
	info->generic.out.reparse_tag = 0;
	info->generic.out.num_streams = 0;
	/* setup a single data stream */
	info->generic.out.num_streams = 1 + (dir?dir->count:0);
	info->generic.out.streams = talloc_array(req, 
						   struct stream_struct,
						   info->generic.out.num_streams);
	if (!info->generic.out.streams) {
		return NT_STATUS_NO_MEMORY;
	}
	info->generic.out.streams[0].size = st->st_size;
	info->generic.out.streams[0].alloc_size = st->st_size;
	info->generic.out.streams[0].stream_name.s = talloc_strdup(req,"::$DATA");

	for (i=0;dir && i<dir->count;i++) {
		s = strchr(dir->files[i].name, ':');
		info->generic.out.streams[1+i].size = dir->files[i].st.st_size;
		info->generic.out.streams[1+i].alloc_size = dir->files[i].st.st_size;
		info->generic.out.streams[1+i].stream_name.s = s?s:dir->files[i].name;
	}

	return NT_STATUS_OK;
}

/*
  return info on a pathname
*/
static NTSTATUS cifspsx_qpathinfo(struct ntvfs_module_context *ntvfs,
			       struct ntvfs_request *req, union smb_fileinfo *info)
{
	char *unix_path;
	struct stat st;

	DEBUG(19,("cifspsx_qpathinfo: file %s level 0x%x\n", info->generic.in.file.path, info->generic.level));
	if (info->generic.level != RAW_FILEINFO_GENERIC) {
		return ntvfs_map_qpathinfo(ntvfs, req, info);
	}
	
	unix_path = cifspsx_unix_path(ntvfs, req, info->generic.in.file.path);
	DEBUG(19,("cifspsx_qpathinfo: file %s\n", unix_path));
	if (stat(unix_path, &st) == -1) {
		DEBUG(19,("cifspsx_qpathinfo: file %s errno=%d\n", unix_path, errno));
		return map_nt_error_from_unix(errno);
	}
	DEBUG(19,("cifspsx_qpathinfo: file %s, stat done\n", unix_path));
	return cifspsx_map_fileinfo(ntvfs, req, info, &st, unix_path);
}

/*
  query info on a open file
*/
static NTSTATUS cifspsx_qfileinfo(struct ntvfs_module_context *ntvfs,
			       struct ntvfs_request *req, union smb_fileinfo *info)
{
	struct cifspsx_private *private = ntvfs->private_data;
	struct cifspsx_file *f;
	struct stat st;

	if (info->generic.level != RAW_FILEINFO_GENERIC) {
		return ntvfs_map_qfileinfo(ntvfs, req, info);
	}

	f = find_fd(private, info->generic.in.file.ntvfs);
	if (!f) {
		return NT_STATUS_INVALID_HANDLE;
	}
	
	if (fstat(f->fd, &st) == -1) {
		return map_nt_error_from_unix(errno);
	}

	return cifspsx_map_fileinfo(ntvfs, req,info, &st, f->name);
}


/*
  open a file
*/
static NTSTATUS cifspsx_open(struct ntvfs_module_context *ntvfs,
			  struct ntvfs_request *req, union smb_open *io)
{
	struct cifspsx_private *private = ntvfs->private_data;
	char *unix_path;
	struct stat st;
	int fd, flags;
	struct cifspsx_file *f;
	int create_flags, rdwr_flags;
	bool readonly;
	NTSTATUS status;
	struct ntvfs_handle *handle;
	
	if (io->generic.level != RAW_OPEN_GENERIC) {
		return ntvfs_map_open(ntvfs, req, io);
	}

	readonly = share_bool_option(ntvfs->ctx->config, SHARE_READONLY, SHARE_READONLY_DEFAULT);
	if (readonly) {
		create_flags = 0;
		rdwr_flags = O_RDONLY;
	} else {
		create_flags = O_CREAT;
		rdwr_flags = O_RDWR;
	}

	unix_path = cifspsx_unix_path(ntvfs, req, io->ntcreatex.in.fname);

	switch (io->generic.in.open_disposition) {
	case NTCREATEX_DISP_SUPERSEDE:
	case NTCREATEX_DISP_OVERWRITE_IF:
		flags = create_flags | O_TRUNC;
		break;
	case NTCREATEX_DISP_OPEN:
	case NTCREATEX_DISP_OVERWRITE:
		flags = 0;
		break;
	case NTCREATEX_DISP_CREATE:
		flags = create_flags | O_EXCL;
		break;
	case NTCREATEX_DISP_OPEN_IF:
		flags = create_flags;
		break;
	default:
		flags = 0;
		break;
	}
	
	flags |= rdwr_flags;

	if (io->generic.in.create_options & NTCREATEX_OPTIONS_DIRECTORY) {
		flags = O_RDONLY | O_DIRECTORY;
		if (readonly) {
			goto do_open;
		}
		switch (io->generic.in.open_disposition) {
		case NTCREATEX_DISP_CREATE:
			if (mkdir(unix_path, 0755) == -1) {
				DEBUG(9,("cifspsx_open: mkdir %s errno=%d\n", unix_path, errno));
				return map_nt_error_from_unix(errno);
			}
			break;
		case NTCREATEX_DISP_OPEN_IF:
			if (mkdir(unix_path, 0755) == -1 && errno != EEXIST) {
				DEBUG(9,("cifspsx_open: mkdir %s errno=%d\n", unix_path, errno));
				return map_nt_error_from_unix(errno);
			}
			break;
		}
	}

do_open:
	fd = open(unix_path, flags, 0644);
	if (fd == -1) {
		return map_nt_error_from_unix(errno);
	}

	if (fstat(fd, &st) == -1) {
		DEBUG(9,("cifspsx_open: fstat errno=%d\n", errno));
		close(fd);
		return map_nt_error_from_unix(errno);
	}

	status = ntvfs_handle_new(ntvfs, req, &handle);
	NT_STATUS_NOT_OK_RETURN(status);

	f = talloc(handle, struct cifspsx_file);
	NT_STATUS_HAVE_NO_MEMORY(f);
	f->fd = fd;
	f->name = talloc_strdup(f, unix_path);
	NT_STATUS_HAVE_NO_MEMORY(f->name);

	DLIST_ADD(private->open_files, f);

	status = ntvfs_handle_set_backend_data(handle, ntvfs, f);
	NT_STATUS_NOT_OK_RETURN(status);

	ZERO_STRUCT(io->generic.out);
	
	unix_to_nt_time(&io->generic.out.create_time, st.st_ctime);
	unix_to_nt_time(&io->generic.out.access_time, st.st_atime);
	unix_to_nt_time(&io->generic.out.write_time,  st.st_mtime);
	unix_to_nt_time(&io->generic.out.change_time, st.st_mtime);
	io->generic.out.file.ntvfs = handle;
	io->generic.out.alloc_size = st.st_size;
	io->generic.out.size = st.st_size;
	io->generic.out.attrib = cifspsx_unix_to_dos_attrib(st.st_mode);
	io->generic.out.is_directory = S_ISDIR(st.st_mode) ? 1 : 0;

	return NT_STATUS_OK;
}

/*
  create a directory
*/
static NTSTATUS cifspsx_mkdir(struct ntvfs_module_context *ntvfs,
			   struct ntvfs_request *req, union smb_mkdir *md)
{
	char *unix_path;

	CHECK_READ_ONLY(req);

	if (md->generic.level != RAW_MKDIR_MKDIR) {
		return NT_STATUS_INVALID_LEVEL;
	}

	unix_path = cifspsx_unix_path(ntvfs, req, md->mkdir.in.path);

	if (mkdir(unix_path, 0777) == -1) {
		return map_nt_error_from_unix(errno);
	}

	return NT_STATUS_OK;
}

/*
  remove a directory
*/
static NTSTATUS cifspsx_rmdir(struct ntvfs_module_context *ntvfs,
			   struct ntvfs_request *req, struct smb_rmdir *rd)
{
	char *unix_path;

	CHECK_READ_ONLY(req);

	unix_path = cifspsx_unix_path(ntvfs, req, rd->in.path);

	if (rmdir(unix_path) == -1) {
		return map_nt_error_from_unix(errno);
	}

	return NT_STATUS_OK;
}

/*
  rename a set of files
*/
static NTSTATUS cifspsx_rename(struct ntvfs_module_context *ntvfs,
			    struct ntvfs_request *req, union smb_rename *ren)
{
	char *unix_path1, *unix_path2;

	CHECK_READ_ONLY(req);

	if (ren->generic.level != RAW_RENAME_RENAME) {
		return NT_STATUS_INVALID_LEVEL;
	}

	unix_path1 = cifspsx_unix_path(ntvfs, req, ren->rename.in.pattern1);
	unix_path2 = cifspsx_unix_path(ntvfs, req, ren->rename.in.pattern2);

	if (rename(unix_path1, unix_path2) == -1) {
		return map_nt_error_from_unix(errno);
	}
	
	return NT_STATUS_OK;
}

/*
  copy a set of files
*/
static NTSTATUS cifspsx_copy(struct ntvfs_module_context *ntvfs,
			  struct ntvfs_request *req, struct smb_copy *cp)
{
	return NT_STATUS_NOT_SUPPORTED;
}

/*
  read from a file
*/
static NTSTATUS cifspsx_read(struct ntvfs_module_context *ntvfs,
			  struct ntvfs_request *req, union smb_read *rd)
{
	struct cifspsx_private *private = ntvfs->private_data;
	struct cifspsx_file *f;
	ssize_t ret;

	if (rd->generic.level != RAW_READ_READX) {
		return NT_STATUS_NOT_SUPPORTED;
	}

	f = find_fd(private, rd->readx.in.file.ntvfs);
	if (!f) {
		return NT_STATUS_INVALID_HANDLE;
	}

	ret = pread(f->fd, 
		    rd->readx.out.data, 
		    rd->readx.in.maxcnt,
		    rd->readx.in.offset);
	if (ret == -1) {
		return map_nt_error_from_unix(errno);
	}

	rd->readx.out.nread = ret;
	rd->readx.out.remaining = 0; /* should fill this in? */
	rd->readx.out.compaction_mode = 0; 

	return NT_STATUS_OK;
}

/*
  write to a file
*/
static NTSTATUS cifspsx_write(struct ntvfs_module_context *ntvfs,
			   struct ntvfs_request *req, union smb_write *wr)
{
	struct cifspsx_private *private = ntvfs->private_data;
	struct cifspsx_file *f;
	ssize_t ret;

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

	CHECK_READ_ONLY(req);

	f = find_fd(private, wr->writex.in.file.ntvfs);
	if (!f) {
		return NT_STATUS_INVALID_HANDLE;
	}

	ret = pwrite(f->fd, 
		     wr->writex.in.data, 
		     wr->writex.in.count,
		     wr->writex.in.offset);
	if (ret == -1) {
		return map_nt_error_from_unix(errno);
	}
		
	wr->writex.out.nwritten = ret;
	wr->writex.out.remaining = 0; /* should fill this in? */
	
	return NT_STATUS_OK;
}

/*
  seek in a file
*/
static NTSTATUS cifspsx_seek(struct ntvfs_module_context *ntvfs,
			  struct ntvfs_request *req,
			  union smb_seek *io)
{
	return NT_STATUS_NOT_SUPPORTED;
}

/*
  flush a file
*/
static NTSTATUS cifspsx_flush(struct ntvfs_module_context *ntvfs,
			   struct ntvfs_request *req,
			   union smb_flush *io)
{
	struct cifspsx_private *private = ntvfs->private_data;
	struct cifspsx_file *f;

	switch (io->generic.level) {
	case RAW_FLUSH_FLUSH:
	case RAW_FLUSH_SMB2:
		/* ignore the additional unknown option in SMB2 */
		f = find_fd(private, io->generic.in.file.ntvfs);
		if (!f) {
			return NT_STATUS_INVALID_HANDLE;
		}
		fsync(f->fd);
		return NT_STATUS_OK;

	case RAW_FLUSH_ALL:
		for (f=private->open_files;f;f=f->next) {
			fsync(f->fd);
		}
		return NT_STATUS_OK;
	}

	return NT_STATUS_INVALID_LEVEL;
}

/*
  close a file
*/
static NTSTATUS cifspsx_close(struct ntvfs_module_context *ntvfs,
			   struct ntvfs_request *req,
			   union smb_close *io)
{
	struct cifspsx_private *private = ntvfs->private_data;
	struct cifspsx_file *f;

	if (io->generic.level != RAW_CLOSE_CLOSE) {
		/* we need a mapping function */
		return NT_STATUS_INVALID_LEVEL;
	}

	f = find_fd(private, io->close.in.file.ntvfs);
	if (!f) {
		return NT_STATUS_INVALID_HANDLE;
	}

	if (close(f->fd) == -1) {
		return map_nt_error_from_unix(errno);
	}

	DLIST_REMOVE(private->open_files, f);
	talloc_free(f->name);
	talloc_free(f);

	return NT_STATUS_OK;
}

/*
  exit - closing files
*/
static NTSTATUS cifspsx_exit(struct ntvfs_module_context *ntvfs,
			  struct ntvfs_request *req)
{
	return NT_STATUS_NOT_SUPPORTED;
}

/*
  logoff - closing files
*/
static NTSTATUS cifspsx_logoff(struct ntvfs_module_context *ntvfs,
			    struct ntvfs_request *req)
{
	return NT_STATUS_NOT_SUPPORTED;
}

/*
  setup for an async call
*/
static NTSTATUS cifspsx_async_setup(struct ntvfs_module_context *ntvfs,
				 struct ntvfs_request *req, 
				 void *private)
{
	return NT_STATUS_OK;
}

/*
  cancel an async call
*/
static NTSTATUS cifspsx_cancel(struct ntvfs_module_context *ntvfs, struct ntvfs_request *req)
{
	return NT_STATUS_UNSUCCESSFUL;
}

/*
  lock a byte range
*/
static NTSTATUS cifspsx_lock(struct ntvfs_module_context *ntvfs,
			  struct ntvfs_request *req, union smb_lock *lck)
{
	DEBUG(0,("REWRITE: not doing byte range locking!\n"));
	return NT_STATUS_OK;
}

/*
  set info on a pathname
*/
static NTSTATUS cifspsx_setpathinfo(struct ntvfs_module_context *ntvfs,
				 struct ntvfs_request *req, union smb_setfileinfo *st)
{
	CHECK_READ_ONLY(req);

	return NT_STATUS_NOT_SUPPORTED;
}

/*
  set info on a open file
*/
static NTSTATUS cifspsx_setfileinfo(struct ntvfs_module_context *ntvfs,
				 struct ntvfs_request *req, 
				 union smb_setfileinfo *info)
{
	struct cifspsx_private *private = ntvfs->private_data;
	struct cifspsx_file *f;
	struct utimbuf unix_times;

	CHECK_READ_ONLY(req);

	f = find_fd(private, info->generic.in.file.ntvfs);
	if (!f) {
		return NT_STATUS_INVALID_HANDLE;
	}
	
	switch (info->generic.level) {
	case RAW_SFILEINFO_END_OF_FILE_INFO:
	case RAW_SFILEINFO_END_OF_FILE_INFORMATION:
		if (ftruncate(f->fd, 
			      info->end_of_file_info.in.size) == -1) {
			return map_nt_error_from_unix(errno);
		}
		break;
	case RAW_SFILEINFO_SETATTRE:
		unix_times.actime = info->setattre.in.access_time;
		unix_times.modtime = info->setattre.in.write_time;

		if (unix_times.actime == 0 && unix_times.modtime == 0) {
			break;
		} 

		/* set modify time = to access time if modify time was 0 */
		if (unix_times.actime != 0 && unix_times.modtime == 0) {
			unix_times.modtime = unix_times.actime;
		}

		/* Set the date on this file */
		if (cifspsx_file_utime(f->fd, &unix_times) != 0) {
			return NT_STATUS_ACCESS_DENIED;
		}
  		break;
	default:
		DEBUG(2,("cifspsx_setfileinfo: level %d not implemented\n", 
			 info->generic.level));
		return NT_STATUS_NOT_IMPLEMENTED;
	}
	return NT_STATUS_OK;
}


/*
  return filesystem space info
*/
static NTSTATUS cifspsx_fsinfo(struct ntvfs_module_context *ntvfs,
			    struct ntvfs_request *req, union smb_fsinfo *fs)
{
	struct cifspsx_private *private = ntvfs->private_data;
	struct stat st;

	if (fs->generic.level != RAW_QFS_GENERIC) {
		return ntvfs_map_fsinfo(ntvfs, req, fs);
	}

	if (sys_fsusage(private->connectpath, 
			&fs->generic.out.blocks_free, 
			&fs->generic.out.blocks_total) == -1) {
		return map_nt_error_from_unix(errno);
	}

	fs->generic.out.block_size = 512;

	if (stat(private->connectpath, &st) != 0) {
		return NT_STATUS_DISK_CORRUPT_ERROR;
	}
	
	fs->generic.out.fs_id = st.st_ino;
	unix_to_nt_time(&fs->generic.out.create_time, st.st_ctime);
	fs->generic.out.serial_number = st.st_ino;
	fs->generic.out.fs_attr = 0;
	fs->generic.out.max_file_component_length = 255;
	fs->generic.out.device_type = 0;
	fs->generic.out.device_characteristics = 0;
	fs->generic.out.quota_soft = 0;
	fs->generic.out.quota_hard = 0;
	fs->generic.out.quota_flags = 0;
	fs->generic.out.volume_name = talloc_strdup(req, ntvfs->ctx->config->name);
	fs->generic.out.fs_type = ntvfs->ctx->fs_type;

	return NT_STATUS_OK;
}

#if 0
/*
  return filesystem attribute info
*/
static NTSTATUS cifspsx_fsattr(struct ntvfs_module_context *ntvfs,
			    struct ntvfs_request *req, union smb_fsattr *fs)
{
	struct stat st;
	struct cifspsx_private *private = ntvfs->private_data;

	if (fs->generic.level != RAW_FSATTR_GENERIC) {
		return ntvfs_map_fsattr(ntvfs, req, fs);
	}

	if (stat(private->connectpath, &st) == -1) {
		return map_nt_error_from_unix(errno);
	}

	unix_to_nt_time(&fs->generic.out.create_time, st.st_ctime);
	fs->generic.out.fs_attr = 
		FILE_CASE_PRESERVED_NAMES | 
		FILE_CASE_SENSITIVE_SEARCH | 
		FILE_PERSISTENT_ACLS;
	fs->generic.out.max_file_component_length = 255;
	fs->generic.out.serial_number = 1;
	fs->generic.out.fs_type = talloc_strdup(req, "NTFS");
	fs->generic.out.volume_name = talloc_strdup(req, 
						    lp_servicename(req->tcon->service));

	return NT_STATUS_OK;
}
#endif

/*
  return print queue info
*/
static NTSTATUS cifspsx_lpq(struct ntvfs_module_context *ntvfs,
			 struct ntvfs_request *req, union smb_lpq *lpq)
{
	return NT_STATUS_NOT_SUPPORTED;
}

/* 
   list files in a directory matching a wildcard pattern
*/
static NTSTATUS cifspsx_search_first(struct ntvfs_module_context *ntvfs,
				  struct ntvfs_request *req, union smb_search_first *io, 
				  void *search_private, 
				  bool (*callback)(void *, const union smb_search_data *))
{
	struct cifspsx_dir *dir;
	int i;
	struct cifspsx_private *private = ntvfs->private_data;
	struct search_state *search;
	union smb_search_data file;
	uint_t max_count;

	if (io->generic.level != RAW_SEARCH_TRANS2) {
		return NT_STATUS_NOT_SUPPORTED;
	}

	if (io->generic.data_level != RAW_SEARCH_DATA_BOTH_DIRECTORY_INFO) {
		return NT_STATUS_NOT_SUPPORTED;
	}

	search = talloc_zero(private, struct search_state);
	if (!search) {
		return NT_STATUS_NO_MEMORY;
	}

	max_count = io->t2ffirst.in.max_count;

	dir = cifspsx_list(ntvfs, req, io->t2ffirst.in.pattern);
	if (!dir) {
		return NT_STATUS_FOOBAR;
	}

	search->handle = private->next_search_handle;
	search->dir = dir;

	if (dir->count < max_count) {
		max_count = dir->count;
	}

	for (i=0; i < max_count;i++) {
		ZERO_STRUCT(file);
		unix_to_nt_time(&file.both_directory_info.create_time, dir->files[i].st.st_ctime);
		unix_to_nt_time(&file.both_directory_info.access_time, dir->files[i].st.st_atime);
		unix_to_nt_time(&file.both_directory_info.write_time,  dir->files[i].st.st_mtime);
		unix_to_nt_time(&file.both_directory_info.change_time, dir->files[i].st.st_mtime);
		file.both_directory_info.name.s = dir->files[i].name;
		file.both_directory_info.short_name.s = dir->files[i].name;
		file.both_directory_info.size = dir->files[i].st.st_size;
		file.both_directory_info.attrib = cifspsx_unix_to_dos_attrib(dir->files[i].st.st_mode);

		if (!callback(search_private, &file)) {
			break;
		}
	}

	search->current_index = i;

	io->t2ffirst.out.count = i;
	io->t2ffirst.out.handle = search->handle;
	io->t2ffirst.out.end_of_search = (i == dir->count) ? 1 : 0;

	/* work out if we are going to keep the search state */
	if ((io->t2ffirst.in.flags & FLAG_TRANS2_FIND_CLOSE) ||
	    ((io->t2ffirst.in.flags & FLAG_TRANS2_FIND_CLOSE_IF_END) && (i == dir->count))) {
		talloc_free(search);
	} else {
		private->next_search_handle++;
		DLIST_ADD(private->search, search);
	}

	return NT_STATUS_OK;
}

/* continue a search */
static NTSTATUS cifspsx_search_next(struct ntvfs_module_context *ntvfs,
				 struct ntvfs_request *req, union smb_search_next *io, 
				 void *search_private, 
				 bool (*callback)(void *, const union smb_search_data *))
{
	struct cifspsx_dir *dir;
	int i;
	struct cifspsx_private *private = ntvfs->private_data;
	struct search_state *search;
	union smb_search_data file;
	uint_t max_count;

	if (io->generic.level != RAW_SEARCH_TRANS2) {
		return NT_STATUS_NOT_SUPPORTED;
	}

	if (io->generic.data_level != RAW_SEARCH_DATA_BOTH_DIRECTORY_INFO) {
		return NT_STATUS_NOT_SUPPORTED;
	}

	for (search=private->search; search; search = search->next) {
		if (search->handle == io->t2fnext.in.handle) break;
	}
	
	if (!search) {
		/* we didn't find the search handle */
		return NT_STATUS_FOOBAR;
	}

	dir = search->dir;

	/* the client might be asking for something other than just continuing
	   with the search */
	if (!(io->t2fnext.in.flags & FLAG_TRANS2_FIND_CONTINUE) &&
	    (io->t2fnext.in.flags & FLAG_TRANS2_FIND_REQUIRE_RESUME) &&
	    io->t2fnext.in.last_name && *io->t2fnext.in.last_name) {
		/* look backwards first */
		for (i=search->current_index; i > 0; i--) {
			if (strcmp(io->t2fnext.in.last_name, dir->files[i-1].name) == 0) {
				search->current_index = i;
				goto found;
			}
		}

		/* then look forwards */
		for (i=search->current_index+1; i <= dir->count; i++) {
			if (strcmp(io->t2fnext.in.last_name, dir->files[i-1].name) == 0) {
				search->current_index = i;
				goto found;
			}
		}
	}

found:	
	max_count = search->current_index + io->t2fnext.in.max_count;

	if (max_count > dir->count) {
		max_count = dir->count;
	}

	for (i = search->current_index; i < max_count;i++) {
		ZERO_STRUCT(file);
		unix_to_nt_time(&file.both_directory_info.create_time, dir->files[i].st.st_ctime);
		unix_to_nt_time(&file.both_directory_info.access_time, dir->files[i].st.st_atime);
		unix_to_nt_time(&file.both_directory_info.write_time,  dir->files[i].st.st_mtime);
		unix_to_nt_time(&file.both_directory_info.change_time, dir->files[i].st.st_mtime);
		file.both_directory_info.name.s = dir->files[i].name;
		file.both_directory_info.short_name.s = dir->files[i].name;
		file.both_directory_info.size = dir->files[i].st.st_size;
		file.both_directory_info.attrib = cifspsx_unix_to_dos_attrib(dir->files[i].st.st_mode);

		if (!callback(search_private, &file)) {
			break;
		}
	}

	io->t2fnext.out.count = i - search->current_index;
	io->t2fnext.out.end_of_search = (i == dir->count) ? 1 : 0;

	search->current_index = i;

	/* work out if we are going to keep the search state */
	if ((io->t2fnext.in.flags & FLAG_TRANS2_FIND_CLOSE) ||
	    ((io->t2fnext.in.flags & FLAG_TRANS2_FIND_CLOSE_IF_END) && (i == dir->count))) {
		DLIST_REMOVE(private->search, search);
		talloc_free(search);
	}

	return NT_STATUS_OK;
}

/* close a search */
static NTSTATUS cifspsx_search_close(struct ntvfs_module_context *ntvfs,
				  struct ntvfs_request *req, union smb_search_close *io)
{
	struct cifspsx_private *private = ntvfs->private_data;
	struct search_state *search;

	for (search=private->search; search; search = search->next) {
		if (search->handle == io->findclose.in.handle) break;
	}
	
	if (!search) {
		/* we didn't find the search handle */
		return NT_STATUS_FOOBAR;
	}

	DLIST_REMOVE(private->search, search);
	talloc_free(search);

	return NT_STATUS_OK;
}

/* SMBtrans - not used on file shares */
static NTSTATUS cifspsx_trans(struct ntvfs_module_context *ntvfs,
			   struct ntvfs_request *req, struct smb_trans2 *trans2)
{
	return NT_STATUS_ACCESS_DENIED;
}


/*
  initialialise the POSIX disk backend, registering ourselves with the ntvfs subsystem
 */
NTSTATUS ntvfs_cifs_posix_init(void)
{
	NTSTATUS ret;
	struct ntvfs_ops ops;
	NTVFS_CURRENT_CRITICAL_SIZES(vers);

	ZERO_STRUCT(ops);

	/* fill in all the operations */
	ops.connect = cifspsx_connect;
	ops.disconnect = cifspsx_disconnect;
	ops.unlink = cifspsx_unlink;
	ops.chkpath = cifspsx_chkpath;
	ops.qpathinfo = cifspsx_qpathinfo;
	ops.setpathinfo = cifspsx_setpathinfo;
	ops.open = cifspsx_open;
	ops.mkdir = cifspsx_mkdir;
	ops.rmdir = cifspsx_rmdir;
	ops.rename = cifspsx_rename;
	ops.copy = cifspsx_copy;
	ops.ioctl = cifspsx_ioctl;
	ops.read = cifspsx_read;
	ops.write = cifspsx_write;
	ops.seek = cifspsx_seek;
	ops.flush = cifspsx_flush;	
	ops.close = cifspsx_close;
	ops.exit = cifspsx_exit;
	ops.lock = cifspsx_lock;
	ops.setfileinfo = cifspsx_setfileinfo;
	ops.qfileinfo = cifspsx_qfileinfo;
	ops.fsinfo = cifspsx_fsinfo;
	ops.lpq = cifspsx_lpq;
	ops.search_first = cifspsx_search_first;
	ops.search_next = cifspsx_search_next;
	ops.search_close = cifspsx_search_close;
	ops.trans = cifspsx_trans;
	ops.logoff = cifspsx_logoff;
	ops.async_setup = cifspsx_async_setup;
	ops.cancel = cifspsx_cancel;

	/* register ourselves with the NTVFS subsystem. We register
	   under names 'cifsposix'
	*/

	ops.type = NTVFS_DISK;
	ops.name = "cifsposix";
	ret = ntvfs_register(&ops, &vers);

	if (!NT_STATUS_IS_OK(ret)) {
		DEBUG(0,("Failed to register cifs posix backend with name: %s!\n",
			 ops.name));
	}

	return ret;
}
