/*-
* Copyright (c) 2012
* Vrije Universiteit, Amsterdam, The Netherlands. All rights reserved.
*
* Author: Evgeniy Ivanov
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
* IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#define NR_DZONES 7 /* # direct zone numbers in an inode */
#define NR_TZONES 10 /* total # zone numbers in an inode */
#define NIADDR 2 /* Indirect addresses in inode */
struct mfs_dinode {
uint16_t mdi_mode; /* file type, protection, etc. */
uint16_t mdi_nlinks; /* how many links to this file */
int16_t mdi_uid; /* user id of the file's owner */
uint16_t mdi_gid; /* group number */
uint32_t mdi_size; /* current file size in bytes */
uint32_t mdi_atime; /* time of last access */
uint32_t mdi_mtime; /* when was file data last changed */
uint32_t mdi_ctime; /* when was inode itself changed */
zone_t mdi_zone[NR_TZONES]; /* zone numbers for direct, ind, and
dbl ind */
};
/* Maximum Minix MFS on-disk directory filename.
* MFS uses 'struct direct' to write and parse
* directory entries, so this can't be changed
* without breaking filesystems.
*/
#define MFS_DIRSIZ 60
struct mfs_sblock {
uint32_t mfs_ninodes; /* # usable inodes on the minor device */
zone1_t mfs_nzones; /* total device size, including bit maps etc */
int16_t mfs_imap_blocks; /* # of blocks used by inode bit map */
int16_t mfs_zmap_blocks; /* # of blocks used by zone bit map */
zone1_t mfs_firstdatazone_old;/* number of first data zone (small) */
int16_t mfs_log_zone_size; /* log2 of blocks/zone */
int16_t mfs_pad; /* try to avoid compiler-dependent padding */
int32_t mfs_max_size; /* maximum file size on this device */
zone_t mfs_zones; /* number of zones (replaces s_nzones in V2) */
int16_t mfs_magic; /* magic number to recognize super-blocks */
int16_t mfs_pad2; /* try to avoid compiler-dependent padding */
uint16_t mfs_block_size; /* block size in bytes. */
char mfs_disk_version; /* filesystem format sub-version */
/* The following items are only used when the super_block is in memory,
* mfs_inodes_per_block must be the firs one (see SBSIZE)
*/
unsigned mfs_inodes_per_block; /* precalculated from magic number */
zone_t mfs_firstdatazone; /* number of first data zone (big) */
int32_t mfs_bshift; /* ``lblkno'' calc of logical blkno */
int32_t mfs_bmask; /* ``blkoff'' calc of blk offsets */
int64_t mfs_qbmask; /* ~fs_bmask - for use with quad size */
int32_t mfs_fsbtodb; /* fsbtodb and dbtofsb shift constant */
};
/*
* The following macros optimize certain frequently calculated
* quantities by using shifts and masks in place of divisions
* modulos and multiplications.
*/
#define mfs_blkoff(fs, loc) /* calculates (loc % fs->mfs_bsize) */ \
((loc) & (fs)->mfs_qbmask)
#define mfs_lblkno(fs, loc) /* calculates (loc / fs->mfs_bsize) */ \
((loc) >> (fs)->mfs_bshift)
/* Flag bits for i_mode in the inode. */
#define I_TYPE 0170000 /* this field gives inode type */
#define I_UNIX_SOCKET 0140000 /* unix domain socket */
#define I_SYMBOLIC_LINK 0120000 /* file is a symbolic link */
#define I_REGULAR 0100000 /* regular file, not dir or special */
#define I_BLOCK_SPECIAL 0060000 /* block special file */
#define I_DIRECTORY 0040000 /* file is a directory */
#define I_CHAR_SPECIAL 0020000 /* character special file */
#define I_NAMED_PIPE 0010000 /* named pipe (FIFO) */
#define I_SET_UID_BIT 0004000 /* set effective uid_t on exec */
#define I_SET_GID_BIT 0002000 /* set effective gid_t on exec */
#define I_SET_STCKY_BIT 0001000 /* sticky bit */
#define ALL_MODES 0007777 /* all bits for user, group and others */
#define RWX_MODES 0000777 /* mode bits for RWX only */
#define R_BIT 0000004 /* Rwx protection bit */
#define W_BIT 0000002 /* rWx protection bit */
#define X_BIT 0000001 /* rwX protection bit */
#define I_NOT_ALLOC 0000000 /* this inode is free */
