Initial Revision

1 files changed, 174 insertions, 0 deletions

diff --git a/serverboot/file_io.h b/serverboot/file_io.h
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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_ */