/*
   Unix SMB/CIFS implementation.
   Wrap disk only vfs functions to sidestep dodgy compilers.
   Copyright (C) Tim Potter 1998
   Copyright (C) Jeremy Allison 2007

   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/>.
*/

#include "includes.h"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_VFS

/* Check for NULL pointer parameters in vfswrap_* functions */

/* We don't want to have NULL function pointers lying around.  Someone
   is sure to try and execute them.  These stubs are used to prevent
   this possibility. */

static int vfswrap_connect(vfs_handle_struct *handle,  const char *service, const char *user)
{
    return 0;    /* Return >= 0 for success */
}

static void vfswrap_disconnect(vfs_handle_struct *handle)
{
}

/* Disk operations */

static uint64_t vfswrap_disk_free(vfs_handle_struct *handle,  const char *path, bool small_query, uint64_t *bsize,
			       uint64_t *dfree, uint64_t *dsize)
{
	uint64_t result;

	result = sys_disk_free(handle->conn, path, small_query, bsize, dfree, dsize);
	return result;
}

static int vfswrap_get_quota(struct vfs_handle_struct *handle,  enum SMB_QUOTA_TYPE qtype, unid_t id, SMB_DISK_QUOTA *qt)
{
#ifdef HAVE_SYS_QUOTAS
	int result;

	START_PROFILE(syscall_get_quota);
	result = sys_get_quota(handle->conn->connectpath, qtype, id, qt);
	END_PROFILE(syscall_get_quota);
	return result;
#else
	errno = ENOSYS;
	return -1;
#endif
}

static int vfswrap_set_quota(struct vfs_handle_struct *handle,  enum SMB_QUOTA_TYPE qtype, unid_t id, SMB_DISK_QUOTA *qt)
{
#ifdef HAVE_SYS_QUOTAS
	int result;

	START_PROFILE(syscall_set_quota);
	result = sys_set_quota(handle->conn->connectpath, qtype, id, qt);
	END_PROFILE(syscall_set_quota);
	return result;
#else
	errno = ENOSYS;
	return -1;
#endif
}

static int vfswrap_get_shadow_copy_data(struct vfs_handle_struct *handle, struct files_struct *fsp, SHADOW_COPY_DATA *shadow_copy_data, bool labels)
{
	errno = ENOSYS;
	return -1;  /* Not implemented. */
}

static int vfswrap_statvfs(struct vfs_handle_struct *handle,  const char *path, vfs_statvfs_struct *statbuf)
{
	return sys_statvfs(path, statbuf);
}

static uint32_t vfswrap_fs_capabilities(struct vfs_handle_struct *handle,
		enum timestamp_set_resolution *p_ts_res)
{
	connection_struct *conn = handle->conn;
	uint32_t caps = FILE_CASE_SENSITIVE_SEARCH | FILE_CASE_PRESERVED_NAMES;
	struct smb_filename *smb_fname_cpath = NULL;
	NTSTATUS status;
	int ret = -1;

#if defined(DARWINOS)
	struct vfs_statvfs_struct statbuf;
	ZERO_STRUCT(statbuf);
	sys_statvfs(conn->connectpath, &statbuf);
	caps = statbuf.FsCapabilities;
#endif

	*p_ts_res = TIMESTAMP_SET_SECONDS;

	/* Work out what timestamp resolution we can
	 * use when setting a timestamp. */

	status = create_synthetic_smb_fname(talloc_tos(),
				conn->connectpath,
				NULL,
				NULL,
				&smb_fname_cpath);
	if (!NT_STATUS_IS_OK(status)) {
		return caps;
	}

	ret = SMB_VFS_STAT(conn, smb_fname_cpath);
	if (ret == -1) {
		TALLOC_FREE(smb_fname_cpath);
		return caps;
	}

	if (smb_fname_cpath->st.st_ex_mtime.tv_nsec ||
			smb_fname_cpath->st.st_ex_atime.tv_nsec ||
			smb_fname_cpath->st.st_ex_ctime.tv_nsec) {
		/* If any of the normal UNIX directory timestamps
		 * have a non-zero tv_nsec component assume
		 * we might be able to set sub-second timestamps.
		 * See what filetime set primitives we have.
		 */
#if defined(HAVE_UTIMENSAT)
		*p_ts_res = TIMESTAMP_SET_NT_OR_BETTER;
#elif defined(HAVE_UTIMES)
		/* utimes allows msec timestamps to be set. */
		*p_ts_res = TIMESTAMP_SET_MSEC;
#elif defined(HAVE_UTIME)
		/* utime only allows sec timestamps to be set. */
		*p_ts_res = TIMESTAMP_SET_SECONDS;
#endif

		DEBUG(10,("vfswrap_fs_capabilities: timestamp "
			"resolution of %s "
			"available on share %s, directory %s\n",
			*p_ts_res == TIMESTAMP_SET_MSEC ? "msec" : "sec",
			lp_servicename(conn->cnum),
			conn->connectpath ));
	}
	TALLOC_FREE(smb_fname_cpath);
	return caps;
}

/* Directory operations */

static SMB_STRUCT_DIR *vfswrap_opendir(vfs_handle_struct *handle,  const char *fname, const char *mask, uint32 attr)
{
	SMB_STRUCT_DIR *result;

	START_PROFILE(syscall_opendir);
	result = sys_opendir(fname);
	END_PROFILE(syscall_opendir);
	return result;
}

static SMB_STRUCT_DIRENT *vfswrap_readdir(vfs_handle_struct *handle,
				          SMB_STRUCT_DIR *dirp,
					  SMB_STRUCT_STAT *sbuf)
{
	SMB_STRUCT_DIRENT *result;

	START_PROFILE(syscall_readdir);
	result = sys_readdir(dirp);
	/* Default Posix readdir() does not give us stat info.
	 * Set to invalid to indicate we didn't return this info. */
	if (sbuf)
		SET_STAT_INVALID(*sbuf);
	END_PROFILE(syscall_readdir);
	return result;
}

static void vfswrap_seekdir(vfs_handle_struct *handle,  SMB_STRUCT_DIR *dirp, long offset)
{
	START_PROFILE(syscall_seekdir);
	sys_seekdir(dirp, offset);
	END_PROFILE(syscall_seekdir);
}

static long vfswrap_telldir(vfs_handle_struct *handle,  SMB_STRUCT_DIR *dirp)
{
	long result;
	START_PROFILE(syscall_telldir);
	result = sys_telldir(dirp);
	END_PROFILE(syscall_telldir);
	return result;
}

static void vfswrap_rewinddir(vfs_handle_struct *handle,  SMB_STRUCT_DIR *dirp)
{
	START_PROFILE(syscall_rewinddir);
	sys_rewinddir(dirp);
	END_PROFILE(syscall_rewinddir);
}

static int vfswrap_mkdir(vfs_handle_struct *handle,  const char *path, mode_t mode)
{
	int result;
	bool has_dacl = False;
	char *parent = NULL;

	START_PROFILE(syscall_mkdir);

	if (lp_inherit_acls(SNUM(handle->conn))
	    && parent_dirname(talloc_tos(), path, &parent, NULL)
	    && (has_dacl = directory_has_default_acl(handle->conn, parent)))
		mode = 0777;

	TALLOC_FREE(parent);

	result = mkdir(path, mode);

	if (result == 0 && !has_dacl) {
		/*
		 * We need to do this as the default behavior of POSIX ACLs
		 * is to set the mask to be the requested group permission
		 * bits, not the group permission bits to be the requested
		 * group permission bits. This is not what we want, as it will
		 * mess up any inherited ACL bits that were set. JRA.
		 */
		int saved_errno = errno; /* We may get ENOSYS */
		if ((SMB_VFS_CHMOD_ACL(handle->conn, path, mode) == -1) && (errno == ENOSYS))
			errno = saved_errno;
	}

	END_PROFILE(syscall_mkdir);
	return result;
}

static int vfswrap_rmdir(vfs_handle_struct *handle,  const char *path)
{
	int result;

	START_PROFILE(syscall_rmdir);
	result = rmdir(path);
	END_PROFILE(syscall_rmdir);
	return result;
}

static int vfswrap_closedir(vfs_handle_struct *handle,  SMB_STRUCT_DIR *dirp)
{
	int result;

	START_PROFILE(syscall_closedir);
	result = sys_closedir(dirp);
	END_PROFILE(syscall_closedir);
	return result;
}

static void vfswrap_init_search_op(vfs_handle_struct *handle,
				   SMB_STRUCT_DIR *dirp)
{
	/* Default behavior is a NOOP */
}

/* File operations */

static int vfswrap_open(vfs_handle_struct *handle,
			struct smb_filename *smb_fname,
			files_struct *fsp, int flags, mode_t mode)
{
	int result = -1;

	START_PROFILE(syscall_open);

	if (smb_fname->stream_name) {
		errno = ENOENT;
		goto out;
	}

	result = sys_open(smb_fname->base_name, flags, mode);
 out:
	END_PROFILE(syscall_open);
	return result;
}

static NTSTATUS vfswrap_create_file(vfs_handle_struct *handle,
				    struct smb_request *req,
				    uint16_t root_dir_fid,
				    struct smb_filename *smb_fname,
				    uint32_t access_mask,
				    uint32_t share_access,
				    uint32_t create_disposition,
				    uint32_t create_options,
				    uint32_t file_attributes,
				    uint32_t oplock_request,
				    uint64_t allocation_size,
				    struct security_descriptor *sd,
				    struct ea_list *ea_list,
				    files_struct **result,
				    int *pinfo)
{
	return create_file_default(handle->conn, req, root_dir_fid, smb_fname,
				   access_mask, share_access,
				   create_disposition, create_options,
				   file_attributes, oplock_request,
				   allocation_size, sd, ea_list, result,
				   pinfo);
}

static int vfswrap_close(vfs_handle_struct *handle, files_struct *fsp)
{
	int result;

	START_PROFILE(syscall_close);
	result = fd_close_posix(fsp);
	END_PROFILE(syscall_close);
	return result;
}

static ssize_t vfswrap_read(vfs_handle_struct *handle, files_struct *fsp, void *data, size_t n)
{
	ssize_t result;

	START_PROFILE_BYTES(syscall_read, n);
	result = sys_read(fsp->fh->fd, data, n);
	END_PROFILE(syscall_read);
	return result;
}

static ssize_t vfswrap_pread(vfs_handle_struct *handle, files_struct *fsp, void *data,
			size_t n, SMB_OFF_T offset)
{
	ssize_t result;

#if defined(HAVE_PREAD) || defined(HAVE_PREAD64)
	START_PROFILE_BYTES(syscall_pread, n);
	result = sys_pread(fsp->fh->fd, data, n, offset);
	END_PROFILE(syscall_pread);

	if (result == -1 && errno == ESPIPE) {
		/* Maintain the fiction that pipes can be seeked (sought?) on. */
		result = SMB_VFS_READ(fsp, data, n);
		fsp->fh->pos = 0;
	}

#else /* HAVE_PREAD */
	SMB_OFF_T   curr;
	int lerrno;

	curr = SMB_VFS_LSEEK(fsp, 0, SEEK_CUR);
	if (curr == -1 && errno == ESPIPE) {
		/* Maintain the fiction that pipes can be seeked (sought?) on. */
		result = SMB_VFS_READ(fsp, data, n);
		fsp->fh->pos = 0;
		return result;
	}

	if (SMB_VFS_LSEEK(fsp, offset, SEEK_SET) == -1) {
		return -1;
	}

	errno = 0;
	result = SMB_VFS_READ(fsp, data, n);
	lerrno = errno;

	SMB_VFS_LSEEK(fsp, curr, SEEK_SET);
	errno = lerrno;

#endif /* HAVE_PREAD */

	return result;
}

static ssize_t vfswrap_write(vfs_handle_struct *handle, files_struct *fsp, const void *data, size_t n)
{
	ssize_t result;

	START_PROFILE_BYTES(syscall_write, n);
	result = sys_write(fsp->fh->fd, data, n);
	END_PROFILE(syscall_write);
	return result;
}

static ssize_t vfswrap_pwrite(vfs_handle_struct *handle, files_struct *fsp, const void *data,
			size_t n, SMB_OFF_T offset)
{
	ssize_t result;

#if defined(HAVE_PWRITE) || defined(HAVE_PRWITE64)
	START_PROFILE_BYTES(syscall_pwrite, n);
	result = sys_pwrite(fsp->fh->fd, data, n, offset);
	END_PROFILE(syscall_pwrite);

	if (result == -1 && errno == ESPIPE) {
		/* Maintain the fiction that pipes can be sought on. */
		result = SMB_VFS_WRITE(fsp, data, n);
	}

#else /* HAVE_PWRITE */
	SMB_OFF_T   curr;
	int         lerrno;

	curr = SMB_VFS_LSEEK(fsp, 0, SEEK_CUR);
	if (curr == -1) {
		return -1;
	}

	if (SMB_VFS_LSEEK(fsp, offset, SEEK_SET) == -1) {
		return -1;
	}

	result = SMB_VFS_WRITE(fsp, data, n);
	lerrno = errno;

	SMB_VFS_LSEEK(fsp, curr, SEEK_SET);
	errno = lerrno;

#endif /* HAVE_PWRITE */

	return result;
}

static SMB_OFF_T vfswrap_lseek(vfs_handle_struct *handle, files_struct *fsp, SMB_OFF_T offset, int whence)
{
	SMB_OFF_T result = 0;

	START_PROFILE(syscall_lseek);

	/* Cope with 'stat' file opens. */
	if (fsp->fh->fd != -1)
		result = sys_lseek(fsp->fh->fd, offset, whence);

	/*
	 * We want to maintain the fiction that we can seek
	 * on a fifo for file system purposes. This allows
	 * people to set up UNIX fifo's that feed data to Windows
	 * applications. JRA.
	 */

	if((result == -1) && (errno == ESPIPE)) {
		result = 0;
		errno = 0;
	}

	END_PROFILE(syscall_lseek);
	return result;
}

static ssize_t vfswrap_sendfile(vfs_handle_struct *handle, int tofd, files_struct *fromfsp, const DATA_BLOB *hdr,
			SMB_OFF_T offset, size_t n)
{
	ssize_t result;

	START_PROFILE_BYTES(syscall_sendfile, n);
	result = sys_sendfile(tofd, fromfsp->fh->fd, hdr, offset, n);
	END_PROFILE(syscall_sendfile);
	return result;
}

static ssize_t vfswrap_recvfile(vfs_handle_struct *handle,
			int fromfd,
			files_struct *tofsp,
			SMB_OFF_T offset,
			size_t n)
{
	ssize_t result;

	START_PROFILE_BYTES(syscall_recvfile, n);
	result = sys_recvfile(fromfd, tofsp->fh->fd, offset, n);
	END_PROFILE(syscall_recvfile);
	return result;
}

/*********************************************************
 For rename across filesystems Patch from Warren Birnbaum
 <warrenb@hpcvscdp.cv.hp.com>
**********************************************************/

static int copy_reg(const char *source, const char *dest)
{
	SMB_STRUCT_STAT source_stats;
	int saved_errno;
	int ifd = -1;
	int ofd = -1;

	if (sys_lstat (source, &source_stats) == -1)
		return -1;

	if (!S_ISREG (source_stats.st_ex_mode))
		return -1;

	if((ifd = sys_open (source, O_RDONLY, 0)) < 0)
		return -1;

	if (unlink (dest) && errno != ENOENT)
		return -1;

#ifdef O_NOFOLLOW
	if((ofd = sys_open (dest, O_WRONLY | O_CREAT | O_TRUNC | O_NOFOLLOW, 0600)) < 0 )
#else
	if((ofd = sys_open (dest, O_WRONLY | O_CREAT | O_TRUNC , 0600)) < 0 )
#endif
		goto err;

	if (transfer_file(ifd, ofd, (size_t)-1) == -1)
		goto err;

	/*
	 * Try to preserve ownership.  For non-root it might fail, but that's ok.
	 * But root probably wants to know, e.g. if NFS disallows it.
	 */

#ifdef HAVE_FCHOWN
	if ((fchown(ofd, source_stats.st_ex_uid, source_stats.st_ex_gid) == -1) && (errno != EPERM))
#else
	if ((chown(dest, source_stats.st_ex_uid, source_stats.st_ex_gid) == -1) && (errno != EPERM))
#endif
		goto err;

	/*
	 * fchown turns off set[ug]id bits for non-root,
	 * so do the chmod last.
	 */

#if defined(HAVE_FCHMOD)
	if (fchmod (ofd, source_stats.st_ex_mode & 07777))
#else
	if (chmod (dest, source_stats.st_ex_mode & 07777))
#endif
		goto err;

	if (close (ifd) == -1)
		goto err;

	if (close (ofd) == -1)
		return -1;

	/* Try to copy the old file's modtime and access time.  */
	{
		struct utimbuf tv;

		tv.actime = convert_timespec_to_time_t(source_stats.st_ex_atime);
		tv.modtime = convert_timespec_to_time_t(source_stats.st_ex_mtime);
		utime(dest, &tv);
	}

	if (unlink (source) == -1)
		return -1;

	return 0;

  err:

	saved_errno = errno;
	if (ifd != -1)
		close(ifd);
	if (ofd != -1)
		close(ofd);
	errno = saved_errno;
	return -1;
}

static int vfswrap_rename(vfs_handle_struct *handle,
			  const struct smb_filename *smb_fname_src,
			  const struct smb_filename *smb_fname_dst)
{
	int result = -1;

	START_PROFILE(syscall_rename);

	if (smb_fname_src->stream_name || smb_fname_dst->stream_name) {
		errno = ENOENT;
		goto out;
	}

	result = rename(smb_fname_src->base_name, smb_fname_dst->base_name);
	if ((result == -1) && (errno == EXDEV)) {
		/* Rename across filesystems needed. */
		result = copy_reg(smb_fname_src->base_name,
				  smb_fname_dst->base_name);
	}

 out:
	END_PROFILE(syscall_rename);
	return result;
}

static int vfswrap_fsync(vfs_handle_struct *handle, files_struct *fsp)
{
#ifdef HAVE_FSYNC
	int result;

	START_PROFILE(syscall_fsync);
	result = fsync(fsp->fh->fd);
	END_PROFILE(syscall_fsync);
	return result;
#else
	return 0;
#endif
}

static int vfswrap_stat(vfs_handle_struct *handle,
			struct smb_filename *smb_fname)
{
	int result = -1;

	START_PROFILE(syscall_stat);

	if (smb_fname->stream_name) {
		errno = ENOENT;
		goto out;
	}

	result = sys_stat(smb_fname->base_name, &smb_fname->st);
 out:
	END_PROFILE(syscall_stat);
	return result;
}

static int vfswrap_fstat(vfs_handle_struct *handle, files_struct *fsp, SMB_STRUCT_STAT *sbuf)
{
	int result;

	START_PROFILE(syscall_fstat);
	result = sys_fstat(fsp->fh->fd, sbuf);
	END_PROFILE(syscall_fstat);
	return result;
}

static int vfswrap_lstat(vfs_handle_struct *handle,
			 struct smb_filename *smb_fname)
{
	int result = -1;

	START_PROFILE(syscall_lstat);

	if (smb_fname->stream_name) {
		errno = ENOENT;
		goto out;
	}

	result = sys_lstat(smb_fname->base_name, &smb_fname->st);
 out:
	END_PROFILE(syscall_lstat);
	return result;
}

static NTSTATUS vfswrap_translate_name(vfs_handle_struct *handle,
				       char **mapped_name,
				       enum vfs_translate_direction direction)
{
	/* Default behavior is a NOOP */

	if (*mapped_name != NULL)
		return NT_STATUS_OK;

	return NT_STATUS_INVALID_PARAMETER;
}
/********************************************************************
 Given a stat buffer return the allocated size on disk, taking into
 account sparse files.
********************************************************************/
static uint64_t vfswrap_get_alloc_size(vfs_handle_struct *handle,
				       struct files_struct *fsp,
				       const SMB_STRUCT_STAT *sbuf)
{
	uint64_t result;

	START_PROFILE(syscall_get_alloc_size);

	if(S_ISDIR(sbuf->st_ex_mode)) {
		result = 0;
		goto out;
	}

#if defined(HAVE_STAT_ST_BLOCKS) && defined(STAT_ST_BLOCKSIZE)
	result = (uint64_t)STAT_ST_BLOCKSIZE * (uint64_t)sbuf->st_ex_blocks;
#else
	result = get_file_size_stat(sbuf);
#endif

	if (fsp && fsp->initial_allocation_size)
		result = MAX(result,fsp->initial_allocation_size);

	result = smb_roundup(handle->conn, result);

 out:
	END_PROFILE(syscall_get_alloc_size);
	return result;
}

static int vfswrap_unlink(vfs_handle_struct *handle,
			  const struct smb_filename *smb_fname)
{
	int result = -1;

	START_PROFILE(syscall_unlink);

	if (smb_fname->stream_name) {
		errno = ENOENT;
		goto out;
	}
	result = unlink(smb_fname->base_name);

 out:
	END_PROFILE(syscall_unlink);
	return result;
}

static int vfswrap_chmod(vfs_handle_struct *handle,  const char *path, mode_t mode)
{
	int result;

	START_PROFILE(syscall_chmod);

	/*
	 * We need to do this due to the fact that the default POSIX ACL
	 * chmod modifies the ACL *mask* for the group owner, not the
	 * group owner bits directly. JRA.
	 */


	{
		int saved_errno = errno; /* We might get ENOSYS */
		if ((result = SMB_VFS_CHMOD_ACL(handle->conn, path, mode)) == 0) {
			END_PROFILE(syscall_chmod);
			return result;
		}
		/* Error - return the old errno. */
		errno = saved_errno;
	}

	result = chmod(path, mode);
	END_PROFILE(syscall_chmod);
	return result;
}

static int vfswrap_fchmod(vfs_handle_struct *handle, files_struct *fsp, mode_t mode)
{
	int result;

	START_PROFILE(syscall_fchmod);

	/*
	 * We need to do this due to the fact that the default POSIX ACL
	 * chmod modifies the ACL *mask* for the group owner, not the
	 * group owner bits directly. JRA.
	 */

	{
		int saved_errno = errno; /* We might get ENOSYS */
		if ((result = SMB_VFS_FCHMOD_ACL(fsp, mode)) == 0) {
			END_PROFILE(syscall_fchmod);
			return result;
		}
		/* Error - return the old errno. */
		errno = saved_errno;
	}

#if defined(HAVE_FCHMOD)
	result = fchmod(fsp->fh->fd, mode);
#else
	result = -1;
	errno = ENOSYS;
#endif

	END_PROFILE(syscall_fchmod);
	return result;
}

static int vfswrap_chown(vfs_handle_struct *handle, const char *path, uid_t uid, gid_t gid)
{
	int result;

	START_PROFILE(syscall_chown);
	result = chown(path, uid, gid);
	END_PROFILE(syscall_chown);
	return result;
}

static int vfswrap_fchown(vfs_handle_struct *handle, files_struct *fsp, uid_t uid, gid_t gid)
{
#ifdef HAVE_FCHOWN
	int result;

	START_PROFILE(syscall_fchown);
	result = fchown(fsp->fh->fd, uid, gid);
	END_PROFILE(syscall_fchown);
	return result;
#else
	errno = ENOSYS;
	return -1;
#endif
}

static int vfswrap_lchown(vfs_handle_struct *handle, const char *path, uid_t uid, gid_t gid)
{
	int result;

	START_PROFILE(syscall_lchown);
	result = lchown(path, uid, gid);
	END_PROFILE(syscall_lchown);
	return result;
}

static int vfswrap_chdir(vfs_handle_struct *handle,  const char *path)
{
	int result;

	START_PROFILE(syscall_chdir);
	result = chdir(path);
	END_PROFILE(syscall_chdir);
	return result;
}

static char *vfswrap_getwd(vfs_handle_struct *handle,  char *path)
{
	char *result;

	START_PROFILE(syscall_getwd);
	result = sys_getwd(path);
	END_PROFILE(syscall_getwd);
	return result;
}

/*********************************************************************
 nsec timestamp resolution call. Convert down to whatever the underlying
 system will support.
**********************************************************************/

static int vfswrap_ntimes(vfs_handle_struct *handle,
			  const struct smb_filename *smb_fname,
			  struct smb_file_time *ft)
{
	int result = -1;

	START_PROFILE(syscall_ntimes);

	if (smb_fname->stream_name) {
		errno = ENOENT;
		goto out;
	}

	if (null_timespec(ft->atime)) {
		ft->atime= smb_fname->st.st_ex_atime;
	}

	if (null_timespec(ft->mtime)) {
		ft->mtime = smb_fname->st.st_ex_mtime;
	}

	if (!null_timespec(ft->create_time) &&
			lp_store_create_time(SNUM(handle->conn))) {
		set_create_timespec_ea(handle->conn,
				NULL,
				smb_fname,
				ft->create_time);
	}

	if ((timespec_compare(&ft->atime,
				&smb_fname->st.st_ex_atime) == 0) &&
			(timespec_compare(&ft->mtime,
				&smb_fname->st.st_ex_mtime) == 0)) {
		return 0;
	}

#if defined(HAVE_UTIMENSAT)
	if (ft != NULL) {
		struct timespec ts[2];
		ts[0] = ft->atime;
		ts[1] = ft->mtime;
		result = utimensat(AT_FDCWD, smb_fname->base_name, ts, 0);
	} else {
		result = utimensat(AT_FDCWD, smb_fname->base_name, NULL, 0);
	}
#elif defined(HAVE_UTIMES)
	if (ft != NULL) {
		struct timeval tv[2];
		tv[0] = convert_timespec_to_timeval(ft->atime);
		tv[1] = convert_timespec_to_timeval(ft->mtime);
		result = utimes(smb_fname->base_name, tv);
	} else {
		result = utimes(smb_fname->base_name, NULL);
	}
#elif defined(HAVE_UTIME)
	if (ft != NULL) {
		struct utimbuf times;
		times.actime = convert_timespec_to_time_t(ft->atime);
		times.modtime = convert_timespec_to_time_t(ft->mtime);
		result = utime(smb_fname->base_name, &times);
	} else {
		result = utime(smb_fname->base_name, NULL);
	}
#else
	errno = ENOSYS;
	result = -1;
#endif

 out:
	END_PROFILE(syscall_ntimes);
	return result;
}

/*********************************************************************
 A version of ftruncate that will write the space on disk if strict
 allocate is set.
**********************************************************************/

static int strict_allocate_ftruncate(vfs_handle_struct *handle, files_struct *fsp, SMB_OFF_T len)
{
	SMB_STRUCT_STAT st;
	SMB_OFF_T currpos = SMB_VFS_LSEEK(fsp, 0, SEEK_CUR);
	unsigned char zero_space[4096];
	SMB_OFF_T space_to_write;

	if (currpos == -1)
		return -1;

	if (SMB_VFS_FSTAT(fsp, &st) == -1)
		return -1;

	space_to_write = len - st.st_ex_size;

#ifdef S_ISFIFO
	if (S_ISFIFO(st.st_ex_mode))
		return 0;
#endif

	if (st.st_ex_size == len)
		return 0;

	/* Shrink - just ftruncate. */
	if (st.st_ex_size > len)
		return sys_ftruncate(fsp->fh->fd, len);

	/* available disk space is enough or not? */
	if (lp_strict_allocate(SNUM(fsp->conn))){
		uint64_t space_avail;
		uint64_t bsize,dfree,dsize;

		space_avail = get_dfree_info(fsp->conn,
					     fsp->fsp_name->base_name, false,
					     &bsize, &dfree, &dsize);
		/* space_avail is 1k blocks */
		if (space_avail == (uint64_t)-1 ||
				((uint64_t)space_to_write/1024 > space_avail) ) {
			errno = ENOSPC;
			return -1;
		}
	}

	/* Write out the real space on disk. */
	if (SMB_VFS_LSEEK(fsp, st.st_ex_size, SEEK_SET) != st.st_ex_size)
		return -1;

	space_to_write = len - st.st_ex_size;

	memset(zero_space, '\0', sizeof(zero_space));
	while ( space_to_write > 0) {
		SMB_OFF_T retlen;
		SMB_OFF_T current_len_to_write = MIN(sizeof(zero_space),space_to_write);

		retlen = SMB_VFS_WRITE(fsp,(char *)zero_space,current_len_to_write);
		if (retlen <= 0)
			return -1;

		space_to_write -= retlen;
	}

	/* Seek to where we were */
	if (SMB_VFS_LSEEK(fsp, currpos, SEEK_SET) != currpos)
		return -1;

	return 0;
}

static int vfswrap_ftruncate(vfs_handle_struct *handle, files_struct *fsp, SMB_OFF_T len)
{
	int result = -1;
	SMB_STRUCT_STAT st;
	char c = 0;
	SMB_OFF_T currpos;

	START_PROFILE(syscall_ftruncate);

	if (lp_strict_allocate(SNUM(fsp->conn))) {
		result = strict_allocate_ftruncate(handle, fsp, len);
		END_PROFILE(syscall_ftruncate);
		return result;
	}

	/* we used to just check HAVE_FTRUNCATE_EXTEND and only use
	   sys_ftruncate if the system supports it. Then I discovered that
	   you can have some filesystems that support ftruncate
	   expansion and some that don't! On Linux fat can't do
	   ftruncate extend but ext2 can. */

	result = sys_ftruncate(fsp->fh->fd, len);
	if (result == 0)
		goto done;

	/* According to W. R. Stevens advanced UNIX prog. Pure 4.3 BSD cannot
	   extend a file with ftruncate. Provide alternate implementation
	   for this */
	currpos = SMB_VFS_LSEEK(fsp, 0, SEEK_CUR);
	if (currpos == -1) {
		goto done;
	}

	/* Do an fstat to see if the file is longer than the requested
	   size in which case the ftruncate above should have
	   succeeded or shorter, in which case seek to len - 1 and
	   write 1 byte of zero */
	if (SMB_VFS_FSTAT(fsp, &st) == -1) {
		goto done;
	}

#ifdef S_ISFIFO
	if (S_ISFIFO(st.st_ex_mode)) {
		result = 0;
		goto done;
	}
#endif

	if (st.st_ex_size == len) {
		result = 0;
		goto done;
	}

	if (st.st_ex_size > len) {
		/* the sys_ftruncate should have worked */
		goto done;
	}

	if (SMB_VFS_LSEEK(fsp, len-1, SEEK_SET) != len -1)
		goto done;

	if (SMB_VFS_WRITE(fsp, &c, 1)!=1)
		goto done;

	/* Seek to where we were */
	if (SMB_VFS_LSEEK(fsp, currpos, SEEK_SET) != currpos)
		goto done;
	result = 0;

  done:

	END_PROFILE(syscall_ftruncate);
	return result;
}

static bool vfswrap_lock(vfs_handle_struct *handle, files_struct *fsp, int op, SMB_OFF_T offset, SMB_OFF_T count, int type)
{
	bool result;

	START_PROFILE(syscall_fcntl_lock);
	result =  fcntl_lock(fsp->fh->fd, op, offset, count, type);
	END_PROFILE(syscall_fcntl_lock);
	return result;
}

static int vfswrap_kernel_flock(vfs_handle_struct *handle, files_struct *fsp,
				uint32 share_mode, uint32 access_mask)
{
	START_PROFILE(syscall_kernel_flock);
	kernel_flock(fsp->fh->fd, share_mode, access_mask);
	END_PROFILE(syscall_kernel_flock);
	return 0;
}

static bool vfswrap_getlock(vfs_handle_struct *handle, files_struct *fsp, SMB_OFF_T *poffset, SMB_OFF_T *pcount, int *ptype, pid_t *ppid)
{
	bool result;

	START_PROFILE(syscall_fcntl_getlock);
	result =  fcntl_getlock(fsp->fh->fd, poffset, pcount, ptype, ppid);
	END_PROFILE(syscall_fcntl_getlock);
	return result;
}

static int vfswrap_linux_setlease(vfs_handle_struct *handle, files_struct *fsp,
				int leasetype)
{
	int result = -1;

	START_PROFILE(syscall_linux_setlease);

#ifdef HAVE_KERNEL_OPLOCKS_LINUX
	/* first set the signal handler */
	if(linux_set_lease_sighandler(fsp->fh->fd) == -1) {
		return -1;
	}

	result = linux_setlease(fsp->fh->fd, leasetype);
#else
	errno = ENOSYS;
#endif
	END_PROFILE(syscall_linux_setlease);
	return result;
}

static int vfswrap_symlink(vfs_handle_struct *handle,  const char *oldpath, const char *newpath)
{
	int result;

	START_PROFILE(syscall_symlink);
	result = symlink(oldpath, newpath);
	END_PROFILE(syscall_symlink);
	return result;
}

static int vfswrap_readlink(vfs_handle_struct *handle,  const char *path, char *buf, size_t bufsiz)
{
	int result;

	START_PROFILE(syscall_readlink);
	result = readlink(path, buf, bufsiz);
	END_PROFILE(syscall_readlink);
	return result;
}

static int vfswrap_link(vfs_handle_struct *handle,  const char *oldpath, const char *newpath)
{
	int result;

	START_PROFILE(syscall_link);
	result = link(oldpath, newpath);
	END_PROFILE(syscall_link);
	return result;
}

static int vfswrap_mknod(vfs_handle_struct *handle,  const char *pathname, mode_t mode, SMB_DEV_T dev)
{
	int result;

	START_PROFILE(syscall_mknod);
	result = sys_mknod(pathname, mode, dev);
	END_PROFILE(syscall_mknod);
	return result;
}

static char *vfswrap_realpath(vfs_handle_struct *handle,  const char *path, char *resolved_path)
{
	char *result;

	START_PROFILE(syscall_realpath);
	result = realpath(path, resolved_path);
	END_PROFILE(syscall_realpath);
	return result;
}

static NTSTATUS vfswrap_notify_watch(vfs_handle_struct *vfs_handle,
				     struct sys_notify_context *ctx,
				     struct notify_entry *e,
				     void (*callback)(struct sys_notify_context *ctx, 
						      void *private_data,
						      struct notify_event *ev),
				     void *private_data, void *handle)
{
	/*
	 * So far inotify is the only supported default notify mechanism. If
	 * another platform like the the BSD's or a proprietary Unix comes
	 * along and wants another default, we can play the same trick we
	 * played with Posix ACLs.
	 *
	 * Until that is the case, hard-code inotify here.
	 */
#ifdef HAVE_INOTIFY
	if (lp_kernel_change_notify(ctx->conn->params)) {
		return inotify_watch(ctx, e, callback, private_data, handle);
	}
#endif
	/*
	 * Do nothing, leave everything to notify_internal.c
	 */
	return NT_STATUS_OK;
}

static int vfswrap_chflags(vfs_handle_struct *handle, const char *path,
			   unsigned int flags)
{
#ifdef HAVE_CHFLAGS
	return chflags(path, flags);
#else
	errno = ENOSYS;
	return -1;
#endif
}

static struct file_id vfswrap_file_id_create(struct vfs_handle_struct *handle,
					     const SMB_STRUCT_STAT *sbuf)
{
	struct file_id key;

	/* the ZERO_STRUCT ensures padding doesn't break using the key as a
	 * blob */
	ZERO_STRUCT(key);

	key.devid = sbuf->st_ex_dev;
	key.inode = sbuf->st_ex_ino;
	/* key.extid is unused by default. */

	return key;
}

static NTSTATUS vfswrap_streaminfo(vfs_handle_struct *handle,
				   struct files_struct *fsp,
				   const char *fname,
				   TALLOC_CTX *mem_ctx,
				   unsigned int *pnum_streams,
				   struct stream_struct **pstreams)
{
	SMB_STRUCT_STAT sbuf;
	unsigned int num_streams = 0;
	struct stream_struct *streams = NULL;
	int ret;

	if ((fsp != NULL) && (fsp->is_directory)) {
		/*
		 * No default streams on directories
		 */
		goto done;
	}

	if ((fsp != NULL) && (fsp->fh->fd != -1)) {
		ret = SMB_VFS_FSTAT(fsp, &sbuf);
	}
	else {
		struct smb_filename *smb_fname = NULL;
		NTSTATUS status;

		status = create_synthetic_smb_fname(talloc_tos(), fname, NULL,
						    NULL, &smb_fname);
		if (!NT_STATUS_IS_OK(status)) {
			return status;
		}
		if (lp_posix_pathnames()) {
			ret = SMB_VFS_LSTAT(handle->conn, smb_fname);
		} else {
			ret = SMB_VFS_STAT(handle->conn, smb_fname);
		}
		sbuf = smb_fname->st;
		TALLOC_FREE(smb_fname);
	}

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

	if (S_ISDIR(sbuf.st_ex_mode)) {
		goto done;
	}

	streams = talloc(mem_ctx, struct stream_struct);

	if (streams == NULL) {
		return NT_STATUS_NO_MEMORY;
	}

	streams->size = sbuf.st_ex_size;
	streams->alloc_size = SMB_VFS_GET_ALLOC_SIZE(handle->conn, fsp, &sbuf);

	streams->name = talloc_strdup(streams, "::$DATA");
	if (streams->name == NULL) {
		TALLOC_FREE(streams);
		return NT_STATUS_NO_MEMORY;
	}

	num_streams = 1;
 done:
	*pnum_streams = num_streams;
	*pstreams = streams;
	return NT_STATUS_OK;
}

static int vfswrap_get_real_filename(struct vfs_handle_struct *handle,
				     const char *path,
				     const char *name,
				     TALLOC_CTX *mem_ctx,
				     char **found_name)
{
	/*
	 * Don't fall back to get_real_filename so callers can differentiate
	 * between a full directory scan and an actual case-insensitive stat.
	 */
	errno = EOPNOTSUPP;
	return -1;
}

static const char *vfswrap_connectpath(struct vfs_handle_struct *handle,
				       const char *fname)
{
	return handle->conn->connectpath;
}

static NTSTATUS vfswrap_brl_lock_windows(struct vfs_handle_struct *handle,
					 struct byte_range_lock *br_lck,
					 struct lock_struct *plock,
					 bool blocking_lock,
					 struct blocking_lock_record *blr)
{
	SMB_ASSERT(plock->lock_flav == WINDOWS_LOCK);

	/* Note: blr is not used in the default implementation. */
	return brl_lock_windows_default(br_lck, plock, blocking_lock);
}

static bool vfswrap_brl_unlock_windows(struct vfs_handle_struct *handle,
				       struct messaging_context *msg_ctx,
				       struct byte_range_lock *br_lck,
			               const struct lock_struct *plock)
{
	SMB_ASSERT(plock->lock_flav == WINDOWS_LOCK);

	return brl_unlock_windows_default(msg_ctx, br_lck, plock);
}

static bool vfswrap_brl_cancel_windows(struct vfs_handle_struct *handle,
				       struct byte_range_lock *br_lck,
				       struct lock_struct *plock,
				       struct blocking_lock_record *blr)
{
	SMB_ASSERT(plock->lock_flav == WINDOWS_LOCK);

	/* Note: blr is not used in the default implementation. */
	return brl_lock_cancel_default(br_lck, plock);
}

static bool vfswrap_strict_lock(struct vfs_handle_struct *handle,
				files_struct *fsp,
				struct lock_struct *plock)
{
	SMB_ASSERT(plock->lock_type == READ_LOCK ||
	    plock->lock_type == WRITE_LOCK);

	return strict_lock_default(fsp, plock);
}

static void vfswrap_strict_unlock(struct vfs_handle_struct *handle,
				files_struct *fsp,
				struct lock_struct *plock)
{
	SMB_ASSERT(plock->lock_type == READ_LOCK ||
	    plock->lock_type == WRITE_LOCK);

	strict_unlock_default(fsp, plock);
}

/* NT ACL operations. */

static NTSTATUS vfswrap_fget_nt_acl(vfs_handle_struct *handle,
				    files_struct *fsp,
				    uint32 security_info, SEC_DESC **ppdesc)
{
	NTSTATUS result;

	START_PROFILE(fget_nt_acl);
	result = posix_fget_nt_acl(fsp, security_info, ppdesc);
	END_PROFILE(fget_nt_acl);
	return result;
}

static NTSTATUS vfswrap_get_nt_acl(vfs_handle_struct *handle,
				   const char *name,
				   uint32 security_info, SEC_DESC **ppdesc)
{
	NTSTATUS result;

	START_PROFILE(get_nt_acl);
	result = posix_get_nt_acl(handle->conn, name, security_info, ppdesc);
	END_PROFILE(get_nt_acl);
	return result;
}

static NTSTATUS vfswrap_fset_nt_acl(vfs_handle_struct *handle, files_struct *fsp, uint32 security_info_sent, const SEC_DESC *psd)
{
	NTSTATUS result;

	START_PROFILE(fset_nt_acl);
	result = set_nt_acl(fsp, security_info_sent, psd);
	END_PROFILE(fset_nt_acl);
	return result;
}

static int vfswrap_chmod_acl(vfs_handle_struct *handle,  const char *name, mode_t mode)
{
#ifdef HAVE_NO_ACL
	errno = ENOSYS;
	return -1;
#else
	int result;

	START_PROFILE(chmod_acl);
	result = chmod_acl(handle->conn, name, mode);
	END_PROFILE(chmod_acl);
	return result;
#endif
}

static int vfswrap_fchmod_acl(vfs_handle_struct *handle, files_struct *fsp, mode_t mode)
{
#ifdef HAVE_NO_ACL
	errno = ENOSYS;
	return -1;
#else
	int result;

	START_PROFILE(fchmod_acl);
	result = fchmod_acl(fsp, mode);
	END_PROFILE(fchmod_acl);
	return result;
#endif
}

static int vfswrap_sys_acl_get_entry(vfs_handle_struct *handle,  SMB_ACL_T theacl, int entry_id, SMB_ACL_ENTRY_T *entry_p)
{
	return sys_acl_get_entry(theacl, entry_id, entry_p);
}

static int vfswrap_sys_acl_get_tag_type(vfs_handle_struct *handle,  SMB_ACL_ENTRY_T entry_d, SMB_ACL_TAG_T *tag_type_p)
{
	return sys_acl_get_tag_type(entry_d, tag_type_p);
}

static int vfswrap_sys_acl_get_permset(vfs_handle_struct *handle,  SMB_ACL_ENTRY_T entry_d, SMB_ACL_PERMSET_T *permset_p)
{
	return sys_acl_get_permset(entry_d, permset_p);
}

static void * vfswrap_sys_acl_get_qualifier(vfs_handle_struct *handle,  SMB_ACL_ENTRY_T entry_d)
{
	return sys_acl_get_qualifier(entry_d);
}

static SMB_ACL_T vfswrap_sys_acl_get_file(vfs_handle_struct *handle,  const char *path_p, SMB_ACL_TYPE_T type)
{
	return sys_acl_get_file(handle, path_p, type);
}

static SMB_ACL_T vfswrap_sys_acl_get_fd(vfs_handle_struct *handle, files_struct *fsp)
{
	return sys_acl_get_fd(handle, fsp);
}

static int vfswrap_sys_acl_clear_perms(vfs_handle_struct *handle,  SMB_ACL_PERMSET_T permset)
{
	return sys_acl_clear_perms(permset);
}

static int vfswrap_sys_acl_add_perm(vfs_handle_struct *handle,  SMB_ACL_PERMSET_T permset, SMB_ACL_PERM_T perm)
{
	return sys_acl_add_perm(permset, perm);
}

static char * vfswrap_sys_acl_to_text(vfs_handle_struct *handle,  SMB_ACL_T theacl, ssize_t *plen)
{
	return sys_acl_to_text(theacl, plen);
}

static SMB_ACL_T vfswrap_sys_acl_init(vfs_handle_struct *handle,  int count)
{
	return sys_acl_init(count);
}

static int vfswrap_sys_acl_create_entry(vfs_handle_struct *handle,  SMB_ACL_T *pacl, SMB_ACL_ENTRY_T *pentry)
{
	return sys_acl_create_entry(pacl, pentry);
}

static int vfswrap_sys_acl_set_tag_type(vfs_handle_struct *handle,  SMB_ACL_ENTRY_T entry, SMB_ACL_TAG_T tagtype)
{
	return sys_acl_set_tag_type(entry, tagtype);
}

static int vfswrap_sys_acl_set_qualifier(vfs_handle_struct *handle,  SMB_ACL_ENTRY_T entry, void *qual)
{
	return sys_acl_set_qualifier(entry, qual);
}

static int vfswrap_sys_acl_set_permset(vfs_handle_struct *handle,  SMB_ACL_ENTRY_T entry, SMB_ACL_PERMSET_T permset)
{
	return sys_acl_set_permset(entry, permset);
}

static int vfswrap_sys_acl_valid(vfs_handle_struct *handle,  SMB_ACL_T theacl )
{
	return sys_acl_valid(theacl );
}

static int vfswrap_sys_acl_set_file(vfs_handle_struct *handle,  const char *name, SMB_ACL_TYPE_T acltype, SMB_ACL_T theacl)
{
	return sys_acl_set_file(handle, name, acltype, theacl);
}

static int vfswrap_sys_acl_set_fd(vfs_handle_struct *handle, files_struct *fsp, SMB_ACL_T theacl)
{
	return sys_acl_set_fd(handle, fsp, theacl);
}

static int vfswrap_sys_acl_delete_def_file(vfs_handle_struct *handle,  const char *path)
{
	return sys_acl_delete_def_file(handle, path);
}

static int vfswrap_sys_acl_get_perm(vfs_handle_struct *handle,  SMB_ACL_PERMSET_T permset, SMB_ACL_PERM_T perm)
{
	return sys_acl_get_perm(permset, perm);
}

static int vfswrap_sys_acl_free_text(vfs_handle_struct *handle,  char *text)
{
	return sys_acl_free_text(text);
}

static int vfswrap_sys_acl_free_acl(vfs_handle_struct *handle,  SMB_ACL_T posix_acl)
{
	return sys_acl_free_acl(posix_acl);
}

static int vfswrap_sys_acl_free_qualifier(vfs_handle_struct *handle,  void *qualifier, SMB_ACL_TAG_T tagtype)
{
	return sys_acl_free_qualifier(qualifier, tagtype);
}

/****************************************************************
 Extended attribute operations.
*****************************************************************/

static ssize_t vfswrap_getxattr(struct vfs_handle_struct *handle,const char *path, const char *name, void *value, size_t size)
{
	return sys_getxattr(path, name, value, size);
}

static ssize_t vfswrap_lgetxattr(struct vfs_handle_struct *handle,const char *path, const char *name, void *value, size_t size)
{
	return sys_lgetxattr(path, name, value, size);
}

static ssize_t vfswrap_fgetxattr(struct vfs_handle_struct *handle, struct files_struct *fsp, const char *name, void *value, size_t size)
{
	return sys_fgetxattr(fsp->fh->fd, name, value, size);
}

static ssize_t vfswrap_listxattr(struct vfs_handle_struct *handle, const char *path, char *list, size_t size)
{
	return sys_listxattr(path, list, size);
}

ssize_t vfswrap_llistxattr(struct vfs_handle_struct *handle, const char *path, char *list, size_t size)
{
	return sys_llistxattr(path, list, size);
}

ssize_t vfswrap_flistxattr(struct vfs_handle_struct *handle, struct files_struct *fsp, char *list, size_t size)
{
	return sys_flistxattr(fsp->fh->fd, list, size);
}

static int vfswrap_removexattr(struct vfs_handle_struct *handle, const char *path, const char *name)
{
	return sys_removexattr(path, name);
}

static int vfswrap_lremovexattr(struct vfs_handle_struct *handle, const char *path, const char *name)
{
	return sys_lremovexattr(path, name);
}

static int vfswrap_fremovexattr(struct vfs_handle_struct *handle, struct files_struct *fsp, const char *name)
{
	return sys_fremovexattr(fsp->fh->fd, name);
}

static int vfswrap_setxattr(struct vfs_handle_struct *handle, const char *path, const char *name, const void *value, size_t size, int flags)
{
	return sys_setxattr(path, name, value, size, flags);
}

static int vfswrap_lsetxattr(struct vfs_handle_struct *handle, const char *path, const char *name, const void *value, size_t size, int flags)
{
	return sys_lsetxattr(path, name, value, size, flags);
}

static int vfswrap_fsetxattr(struct vfs_handle_struct *handle, struct files_struct *fsp, const char *name, const void *value, size_t size, int flags)
{
	return sys_fsetxattr(fsp->fh->fd, name, value, size, flags);
}

static int vfswrap_aio_read(struct vfs_handle_struct *handle, struct files_struct *fsp, SMB_STRUCT_AIOCB *aiocb)
{
	int ret;
	/*
	 * aio_read must be done as root, because in the glibc aio
	 * implementation the helper thread needs to be able to send a signal
	 * to the main thread, even when it has done a seteuid() to a
	 * different user.
	 */
	become_root();
	ret = sys_aio_read(aiocb);
	unbecome_root();
	return ret;
}

static int vfswrap_aio_write(struct vfs_handle_struct *handle, struct files_struct *fsp, SMB_STRUCT_AIOCB *aiocb)
{
	int ret;
	/*
	 * aio_write must be done as root, because in the glibc aio
	 * implementation the helper thread needs to be able to send a signal
	 * to the main thread, even when it has done a seteuid() to a
	 * different user.
	 */
	become_root();
	ret = sys_aio_write(aiocb);
	unbecome_root();
	return ret;
}

static ssize_t vfswrap_aio_return(struct vfs_handle_struct *handle, struct files_struct *fsp, SMB_STRUCT_AIOCB *aiocb)
{
	return sys_aio_return(aiocb);
}

static int vfswrap_aio_cancel(struct vfs_handle_struct *handle, struct files_struct *fsp, SMB_STRUCT_AIOCB *aiocb)
{
	return sys_aio_cancel(fsp->fh->fd, aiocb);
}

static int vfswrap_aio_error(struct vfs_handle_struct *handle, struct files_struct *fsp, SMB_STRUCT_AIOCB *aiocb)
{
	return sys_aio_error(aiocb);
}

static int vfswrap_aio_fsync(struct vfs_handle_struct *handle, struct files_struct *fsp, int op, SMB_STRUCT_AIOCB *aiocb)
{
	return sys_aio_fsync(op, aiocb);
}

static int vfswrap_aio_suspend(struct vfs_handle_struct *handle, struct files_struct *fsp, const SMB_STRUCT_AIOCB * const aiocb[], int n, const struct timespec *timeout)
{
	return sys_aio_suspend(aiocb, n, timeout);
}

static bool vfswrap_aio_force(struct vfs_handle_struct *handle, struct files_struct *fsp)
{
	return false;
}

static bool vfswrap_is_offline(struct vfs_handle_struct *handle, const char *path, SMB_STRUCT_STAT *sbuf)
{
	if (ISDOT(path) || ISDOTDOT(path)) {
		return false;
	}

	if (!lp_dmapi_support(SNUM(handle->conn)) || !dmapi_have_session()) {
#if defined(ENOTSUP)
		errno = ENOTSUP;
#endif
		return false;
	}

	return (dmapi_file_flags(path) & FILE_ATTRIBUTE_OFFLINE) != 0;
}

static int vfswrap_set_offline(struct vfs_handle_struct *handle, const char *path)
{
	/* We don't know how to set offline bit by default, needs to be overriden in the vfs modules */
#if defined(ENOTSUP)
	errno = ENOTSUP;
#endif
	return -1;
}

static struct vfs_fn_pointers vfs_default_fns = {
	/* Disk operations */

	.connect_fn = vfswrap_connect,
	.disconnect = vfswrap_disconnect,
	.disk_free = vfswrap_disk_free,
	.get_quota = vfswrap_get_quota,
	.set_quota = vfswrap_set_quota,
	.get_shadow_copy_data = vfswrap_get_shadow_copy_data,
	.statvfs = vfswrap_statvfs,
	.fs_capabilities = vfswrap_fs_capabilities,

	/* Directory operations */

	.opendir = vfswrap_opendir,
	.readdir = vfswrap_readdir,
	.seekdir = vfswrap_seekdir,
	.telldir = vfswrap_telldir,
	.rewind_dir = vfswrap_rewinddir,
	.mkdir = vfswrap_mkdir,
	.rmdir = vfswrap_rmdir,
	.closedir = vfswrap_closedir,
	.init_search_op = vfswrap_init_search_op,

	/* File operations */

	.open = vfswrap_open,
	.create_file = vfswrap_create_file,
	.close_fn = vfswrap_close,
	.vfs_read = vfswrap_read,
	.pread = vfswrap_pread,
	.write = vfswrap_write,
	.pwrite = vfswrap_pwrite,
	.lseek = vfswrap_lseek,
	.sendfile = vfswrap_sendfile,
	.recvfile = vfswrap_recvfile,
	.rename = vfswrap_rename,
	.fsync = vfswrap_fsync,
	.stat = vfswrap_stat,
	.fstat = vfswrap_fstat,
	.lstat = vfswrap_lstat,
	.get_alloc_size = vfswrap_get_alloc_size,
	.unlink = vfswrap_unlink,
	.chmod = vfswrap_chmod,
	.fchmod = vfswrap_fchmod,
	.chown = vfswrap_chown,
	.fchown = vfswrap_fchown,
	.lchown = vfswrap_lchown,
	.chdir = vfswrap_chdir,
	.getwd = vfswrap_getwd,
	.ntimes = vfswrap_ntimes,
	.ftruncate = vfswrap_ftruncate,
	.lock = vfswrap_lock,
	.kernel_flock = vfswrap_kernel_flock,
	.linux_setlease = vfswrap_linux_setlease,
	.getlock = vfswrap_getlock,
	.symlink = vfswrap_symlink,
	.vfs_readlink = vfswrap_readlink,
	.link = vfswrap_link,
	.mknod = vfswrap_mknod,
	.realpath = vfswrap_realpath,
	.notify_watch = vfswrap_notify_watch,
	.chflags = vfswrap_chflags,
	.file_id_create = vfswrap_file_id_create,
	.streaminfo = vfswrap_streaminfo,
	.get_real_filename = vfswrap_get_real_filename,
	.connectpath = vfswrap_connectpath,
	.brl_lock_windows = vfswrap_brl_lock_windows,
	.brl_unlock_windows = vfswrap_brl_unlock_windows,
	.brl_cancel_windows = vfswrap_brl_cancel_windows,
	.strict_lock = vfswrap_strict_lock,
	.strict_unlock = vfswrap_strict_unlock,
	.translate_name = vfswrap_translate_name,

	/* NT ACL operations. */

	.fget_nt_acl = vfswrap_fget_nt_acl,
	.get_nt_acl = vfswrap_get_nt_acl,
	.fset_nt_acl = vfswrap_fset_nt_acl,

	/* POSIX ACL operations. */

	.chmod_acl = vfswrap_chmod_acl,
	.fchmod_acl = vfswrap_fchmod_acl,

	.sys_acl_get_entry = vfswrap_sys_acl_get_entry,
	.sys_acl_get_tag_type = vfswrap_sys_acl_get_tag_type,
	.sys_acl_get_permset = vfswrap_sys_acl_get_permset,
	.sys_acl_get_qualifier = vfswrap_sys_acl_get_qualifier,
	.sys_acl_get_file = vfswrap_sys_acl_get_file,
	.sys_acl_get_fd = vfswrap_sys_acl_get_fd,
	.sys_acl_clear_perms = vfswrap_sys_acl_clear_perms,
	.sys_acl_add_perm = vfswrap_sys_acl_add_perm,
	.sys_acl_to_text = vfswrap_sys_acl_to_text,
	.sys_acl_init = vfswrap_sys_acl_init,
	.sys_acl_create_entry = vfswrap_sys_acl_create_entry,
	.sys_acl_set_tag_type = vfswrap_sys_acl_set_tag_type,
	.sys_acl_set_qualifier = vfswrap_sys_acl_set_qualifier,
	.sys_acl_set_permset = vfswrap_sys_acl_set_permset,
	.sys_acl_valid = vfswrap_sys_acl_valid,
	.sys_acl_set_file = vfswrap_sys_acl_set_file,
	.sys_acl_set_fd = vfswrap_sys_acl_set_fd,
	.sys_acl_delete_def_file = vfswrap_sys_acl_delete_def_file,
	.sys_acl_get_perm = vfswrap_sys_acl_get_perm,
	.sys_acl_free_text = vfswrap_sys_acl_free_text,
	.sys_acl_free_acl = vfswrap_sys_acl_free_acl,
	.sys_acl_free_qualifier = vfswrap_sys_acl_free_qualifier,

	/* EA operations. */
	.getxattr = vfswrap_getxattr,
	.lgetxattr = vfswrap_lgetxattr,
	.fgetxattr = vfswrap_fgetxattr,
	.listxattr = vfswrap_listxattr,
	.llistxattr = vfswrap_llistxattr,
	.flistxattr = vfswrap_flistxattr,
	.removexattr = vfswrap_removexattr,
	.lremovexattr = vfswrap_lremovexattr,
	.fremovexattr = vfswrap_fremovexattr,
	.setxattr = vfswrap_setxattr,
	.lsetxattr = vfswrap_lsetxattr,
	.fsetxattr = vfswrap_fsetxattr,

	/* aio operations */
	.aio_read = vfswrap_aio_read,
	.aio_write = vfswrap_aio_write,
	.aio_return_fn = vfswrap_aio_return,
	.aio_cancel = vfswrap_aio_cancel,
	.aio_error_fn = vfswrap_aio_error,
	.aio_fsync = vfswrap_aio_fsync,
	.aio_suspend = vfswrap_aio_suspend,
	.aio_force = vfswrap_aio_force,

	/* offline operations */
	.is_offline = vfswrap_is_offline,
	.set_offline = vfswrap_set_offline
};

NTSTATUS vfs_default_init(void);
NTSTATUS vfs_default_init(void)
{
	return smb_register_vfs(SMB_VFS_INTERFACE_VERSION,
				DEFAULT_VFS_MODULE_NAME, &vfs_default_fns);
}