1 /* io.h - Virtual disk input/output
3 Copyright (C) 1993 Werner Almesberger <werner.almesberger@lrc.di.epfl.ch>
4 Copyright (C) 1998 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
6 This program is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
19 On Debian systems, the complete text of the GNU General Public License
20 can be found in /usr/share/common-licenses/GPL-3 file.
23 /* FAT32, VFAT, Atari format support, and various fixes additions May 1998
24 * by Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de> */
30 #include <sys/types.h> /* for loff_t */
32 loff_t llseek(int fd, loff_t offset, int whence);
34 /* lseek() analogue for large offsets. */
36 void fs_open(char *path,int rw);
38 /* Opens the file system PATH. If RW is zero, the file system is opened
39 read-only, otherwise, it is opened read-write. */
41 void fs_read(loff_t pos,int size,void *data);
43 /* Reads SIZE bytes starting at POS into DATA. Performs all applicable
46 int fs_test(loff_t pos,int size);
48 /* Returns a non-zero integer if SIZE bytes starting at POS can be read without
49 errors. Otherwise, it returns zero. */
51 void fs_write(loff_t pos,int size,void *data);
53 /* If write_immed is non-zero, SIZE bytes are written from DATA to the disk,
54 starting at POS. If write_immed is zero, the change is added to a list in
57 int fs_close(int write);
59 /* Closes the file system, performs all pending changes if WRITE is non-zero
60 and removes the list of changes. Returns a non-zero integer if the file
61 system has been changed since the last fs_open, zero otherwise. */
65 /* Determines whether the file system has changed. See fs_close. */
67 extern unsigned device_no;
69 /* Major number of device (0 if file) and size (in 512 byte sectors) */