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/*
* Mach Operating System
* Copyright (c) 1991,1990,1989,1988 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
#ifndef _FILE_IO_H_
#define _FILE_IO_H_
/*
* Read-only file IO.
*/
#include <mach.h>
#include <cthreads.h>
#include <device/device_types.h>
#include <defs.h>
#include "minix_fs.h"
#include "ext2_fs.h"
#include "disk_inode.h"
#define BSD_FFS 0
#define EXT2_FS 1
#define MINIX_FS 2
#define EXT2_NIADDR (EXT2_N_BLOCKS - EXT2_NDIR_BLOCKS)
/*
* In-core open file.
*/
struct file {
struct mutex f_lock; /* lock */
mach_port_t f_dev; /* port to device */
vm_offset_t f_buf; /* buffer for data block */
vm_size_t f_buf_size; /* size of data block */
daddr_t f_buf_blkno; /* block number of data block */
vm_size_t f_size; /* size in bytes of the file */
int f_fstype; /* contains fs-id */
union {
struct {
struct fs * ffs_fs; /* pointer to super-block */
struct icommon ffs_ic; /* copy of on-disk inode */
/* number of blocks mapped by
indirect block at level i */
int ffs_nindir[FFS_NIADDR+1];
/* buffer for indirect block at level i */
vm_offset_t ffs_blk[FFS_NIADDR];
/* size of buffer */
vm_size_t ffs_blksize[FFS_NIADDR];
/* disk address of block in buffer */
daddr_t ffs_blkno[FFS_NIADDR];
} ffs;
struct {
/* pointer to super-block */
struct ext2_super_block*ext2_fs;
/* pointer to group descriptors */
struct ext2_group_desc* ext2_gd;
/* size of group descriptors */
vm_size_t ext2_gd_size;
/* copy of on-disk inode */
struct ext2_inode ext2_ic;
/* number of blocks mapped by
indirect block at level i */
int ext2_nindir[EXT2_NIADDR+1];
/* buffer for indirect block at level i */
vm_offset_t ext2_blk[EXT2_NIADDR];
/* size of buffer */
vm_size_t ext2_blksize[EXT2_NIADDR];
/* disk address of block in buffer */
daddr_t ext2_blkno[EXT2_NIADDR];
} ext2;
struct {
/* pointer to super-block */
struct minix_super_block* minix_fs;
/* copy of on-disk inode */
struct minix_inode minix_ic;
/* number of blocks mapped by
indirect block at level i */
int minix_nindir[MINIX_NIADDR+1];
/* buffer for indirect block at level i */
vm_offset_t minix_blk[MINIX_NIADDR];
/* size of buffer */
vm_size_t minix_blksize[MINIX_NIADDR];
/* disk address of block in buffer */
minix_daddr_t minix_blkno[MINIX_NIADDR];
} minix;
} u;
};
/*
* In-core open file, with in-core block map.
*/
struct file_direct {
int f_fstype; /* XXX was: true if ext2, false if ffs */
mach_port_t fd_dev; /* port to device */
daddr_t * fd_blocks; /* array of disk block addresses */
long fd_size; /* number of blocks in the array */
long fd_bsize; /* disk block size */
long fd_bshift; /* log2(fd_bsize) */
long fd_fsbtodb; /* log2(fd_bsize / disk sector size) */
};
#define file_is_device(_fd_) ((_fd_)->fd_blocks == 0)
/*
* Exported routines.
*/
extern int open_file();
extern void close_file();
extern int read_file();
extern int open_file_direct();
extern int add_file_direct();
extern int remove_file_direct();
extern int file_wire_direct();
extern int page_read_file_direct();
extern int page_write_file_direct();
/*
* Error codes for file system errors.
*/
#define FS_NOT_DIRECTORY 5000 /* not a directory */
#define FS_NO_ENTRY 5001 /* name not found */
#define FS_NAME_TOO_LONG 5002 /* name too long */
#define FS_SYMLINK_LOOP 5003 /* symbolic link loop */
#define FS_INVALID_FS 5004 /* bad file system */
#define FS_NOT_IN_FILE 5005 /* offset not in file */
#define FS_INVALID_PARAMETER 5006 /* bad parameter to
a routine */
#endif /* _FILE_IO_H_ */
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