/* Definitions for the filesystem interface. 
   Copyright (C) 1994 Free Software Foundation

This file is part of the GNU Hurd.

The GNU Hurd 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, or (at your option)
any later version.

The GNU Hurd 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 the GNU Hurd; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */


/* All these objects also implement the generic IO facilities. */

subsystem fs 20000;

#include <hurd/hurd_types.defs>

#ifdef FILE_IMPORTS
FILE_IMPORTS
#endif

/* Operations supported on all files */

/* Overlay a task with a file.  Necessary initialization, including
   authentication changes associated with set[ug]id execution must be
   handled by the filesystem.  Filesystems normally implement this by
   using exec_newtask or exec_loadtask as appropriate.  */
/* INTR */
routine file_exec (
	exec_file: file_t;
	exec_task: task_t;
	flags: int;
	argv: data_t;
	envp: data_t;
	fdarray: portarray_t;
	portarray: portarray_t;
	intarray: intarray_t;
	deallocnames: mach_port_name_array_t;
	destroynames: mach_port_name_array_t);

/* Change owner and/or group */
/* INTR */
routine file_chown (
	chown_file: file_t;
	new_owner: uid_t;
	new_group: gid_t);

/*
Whan that Aprill with hith thoureth thoote
The droghte of March hath perthed to the roote,
And bathed every veyne in thwith licour,
Of which vertu engendred is the flour;
Whan Zephiruth eek with hith thweete breeth
Inthpired hath in every holt and heeth
The tender croppeth, and the yonge thonne
Hath in the Ram his halve courth yronne,
And thmale foweleth maken melodye,
That thlepen all the nyght with open ye
(Tho Priketh hem Nature in hir corageth),
Thanne longen folk to goon on pligrimageth,
And palmereth for to theken thtraunge thtrondeth,
To ferne halweth, kowthe in thondry londeth:
And thpethially, from every thireth ende
Of Engelond to Cantebury they wende,
The hooly blithful martyr for to theke,
That hem hath holpen whan that they were theeke.
*/
/* INTR */
routine file_chauthor (
	chauth_file: file_t;
	new_author: uid_t);

/* Change mode bits */
/* INTR */
routine file_chmod (
	chmod_file: file_t;
	new_mode: mode_t);

/* Change file flags */
/* INTR */
routine file_chflags (
	chflags_file: file_t;
	new_flags: int);

/* Change access and modify times */
/* INTR */
routine file_utimes (
	utimes_file: file_t;
	new_atime: time_value_t;
	new_mtime: time_value_t);

/* Truncate file */
/* INTR */
routine file_truncate (
	trunc_file: file_t;
	new_size: int);

/* Apply/manipulate advisory lock */
/* INTR */
routine file_lock (
	lock_file: file_t;
	flags: int);

/* Return current lock status.  Mystatus tells what kind of lock the
   caller has; otherstatus tells what kind of lock anyone has
   (including the caller).  */
routine file_lock_stat (
	lock_file: file_t;
	out mystatus: int;
	out otherstatus: int);

/* Return control port for this filesystem */
routine file_getcontrol (
	file: file_t;
	out control: mach_port_send_t);

/* Return filesystem status */
/* INTR */
routine file_statfs (
	file: file_t;
	out info: fsys_statfsbuf_t);

/* Sync the individual file */
/* INTR */
routine file_sync (
	file: file_t;
	wait: int);

/* Sync the entire filesystem */
/* INTR */
routine file_syncfs (
	file: file_t;
	wait: int;
	do_children: int);

/* Return Posix.1 pathconf information */
/* INTR */
routine file_pathconf (
	file: file_t;
	name: int;
	out value: int);

/* Return the node for hard links to this potentially translated file.
   This returns a potentially unauthenticated node.  */
routine file_getlinknode (
	file: file_t;
	out linknode: mach_port_send_t);

/* Return a file handle for this file.  This can be used by NFS and such.
   It is not guaranteed that this call will work...if it doesn't, then this
   filesystem cannot be NFS mounted.  */
routine file_getfh (
	file: file_t;
	out filehandle: data_t);

/* Operations supported on directories */

/* Translate a pathname, following all symlinks.  Upon return, if
   do_retry is FS_RETRY_NONE, then result is a port referencing the
   pathname's target.  If do_retry is FS_RETRY_NORMAL, then the call
   needs to be repeated.  If retry_name starts with a slash, then the
   new call needs to be made to the caller's root directory (without
   the leading slash).  If it does not start with a slash, then the
   new call needs to be made to result.  If do_retry is
   FS_RETRY_REAUTH, then the same procedure is followed as for
   FS_RETRY_NORMAL, except retry will need to be reauthenticated
   before use.  */
/* INTR */
routine dir_pathtrans (
	start_dir: file_t;
	pathname: string_t;
	flags: int;
	mode: mode_t;
	out do_retry: retry_type;
	out retry_name: string_t;
	out result: mach_port_send_t);

/* Read dir entries from the directory.  Amount must be a multiple of
   the block size of the file as returned by stat.  Offset should
   either be zero or the value of nextoffset from a previous call to
   dir_readdir for this file.  The retured data is an array of struct
   direct's.  There is no necessary connection between the data
   retured by dir_readdir and io_read on the same port.  However,
   io_read generally returns information in some filesystem-specific
   "raw format", possibly including more information than just
   directory entries.  */
routine dir_readdir (
	dir: file_t;
	out data: data_t;
	offset: off_t;
	out nextoffset: off_t;
	amount: int);

/* Create directory */
/* INTR */
routine dir_mkdir (
	directory: file_t;
	name: string_t;
	mode: mode_t);

/* Remove directory */
/* INTR */
routine dir_rmdir (
	directory: file_t;
	name: string_t);

/* Remove non-directory */
/* INTR */
routine dir_unlink (
	directory: file_t;
	name: string_t);
 
/* Create hard link */ 
/* If oldfile and newdirectory are not implemented by the same
filesystem, POSIX_EXDEV should be returned.  If the two filesystems,
however can inter-operate and guarantee the appropriate Posix
semantics, they can communicate by a private protocol and allow hard
links between them.  */
/* INTR */
routine dir_link (
	oldfile: file_t;
	newdirectory: file_t;
	newname: string_t);

/* Rename file -- comments similar to those for dir_link apply here
   about POSIX_EXDEV. */
/* INTR */
routine dir_rename (
	olddirectory: file_t;
	oldname: string_t;
	newdirectory: file_t;
	newname: string_t);

/* Create a new file without linking it into the filesystem.  You
   still must have write permission on the specified directory, even
   though it will not actually be written.  Return in *newnode a port
   to the file.  Flags are the same as for dir_pathtrans, but 
   O_CREAT and O_TRUNC are assumed even if not specified.  */
/* INTR */
routine dir_mkfile (
	directory: file_t;
	flags: int;
	mode: mode_t;
	out mach_port_send_t newnode);

/* To get or set the translator currently running on a file, use
   file_set_translator, file_get_translator, or
   file_get_translator_cntl on a port gotten with the
   FS_LOOKUP_NOTRANS flag to dir_pathtrans.  You can send these RPCs
   to a port to a translated node (looked up without
   FS_LOOKUP_NOTRANS) to stack a new translator on top of the existing
   one.  */

/* Set a translator for future lookups to a file.  Any existing
   translator is sent an fsys_goaway message with the flags coming
   from oldtrans_flags.  Only if the old translator goes away will
   this call succeed.  If existing is not MACH_PORT_NULL, then there
   is already a translator for this file, and it should be used, with
   the program specified by NAME to be used only if the EXISTING port
   dies.

   Some filesystems understand some translators directly and
   short-circuit the creation of the translator by the normal process.
   To prevent this optimization, set FS_TRANS_FORCE.  */
/* INTR */
routine file_set_translator (
	file: file_t;
	flags: int;
	oldtrans_flags: int;
	translator: data_t;
	existing: mach_port_make_send_t);

/* Return the stored permanent translator for this file.  */
/* INTR */
routine file_get_translator (
	file: file_t;
	out translator: data_t);

/* Return the translator control port to the
   active translator (if any) for this file.  */
/* INTR */
routine file_get_translator_cntl (
	file: file_t;
	out translator_cntl: fsys_t);