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Diffstat (limited to 'serverboot/file_io.h')
| -rw-r--r-- | serverboot/file_io.h | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/serverboot/file_io.h b/serverboot/file_io.h new file mode 100644 index 00000000..323e4e9a --- /dev/null +++ b/serverboot/file_io.h @@ -0,0 +1,200 @@ +/* + * 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 <stdint.h> +#include <device/device_types.h> + +/* Types used by the ext2 header files. */ +typedef u_int32_t __u32; +typedef int32_t __s32; +typedef u_int16_t __u16; +typedef int16_t __s16; +typedef u_int8_t __u8; +typedef int8_t __s8; + +#include <defs.h> +#include "minix_fs.h" +#include "../ext2fs/ext2_fs.h" /* snarf stolen linux header from ext2fs */ +#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. + */ + +#include <errno.h> + +/* Just use the damn Hurd error numbers. This is old CMU/Utah code from + the days of personality-independent Mach where it made sense for this to + be a standalone universe. In the Hurd, we compile serverboot against + the regular C library anyway. */ + +#define FS_NOT_DIRECTORY ENOTDIR +#define FS_NO_ENTRY ENOENT +#define FS_NAME_TOO_LONG ENAMETOOLONG +#define FS_SYMLINK_LOOP ELOOP +#define FS_INVALID_FS EFTYPE /* ? */ +#define FS_NOT_IN_FILE EINVAL +#define FS_INVALID_PARAMETER EINVAL + +#if 0 +#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 routine */ +#endif + + +#endif /* _FILE_IO_H_ */ |