f14fb60209
* Updating common/lib * Updating lib/csu * Updating lib/libc * Updating libexec/ld.elf_so * Corrected test on __minix in featuretest to actually follow the meaning of the comment. * Cleaned up _REENTRANT-related defintions. * Disabled -D_REENTRANT for libfetch * Removing some unneeded __NBSD_LIBC defines and tests Change-Id: Ic1394baef74d11b9f86b312f5ff4bbc3cbf72ce2
179 lines
7.3 KiB
C
179 lines
7.3 KiB
C
/* $NetBSD: minixfs3.h,v 1.1 2012/01/16 18:44:13 christos Exp $ */
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/*-
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* Copyright (c) 2012
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* Vrije Universiteit, Amsterdam, The Netherlands. All rights reserved.
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*
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* Author: Evgeniy Ivanov
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
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* IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef MINIX_FS_3_H
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#define MINIX_FS_3_H
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FS_DEF(minixfs3);
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#ifndef __minix
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typedef uint32_t zone_t;
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typedef uint16_t zone1_t;
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typedef uint32_t block_t;
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#endif
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#define NR_DZONES 7 /* # direct zone numbers in an inode */
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#define NR_TZONES 10 /* total # zone numbers in an inode */
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#define NIADDR 2 /* Indirect addresses in inode */
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struct mfs_dinode {
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uint16_t mdi_mode; /* file type, protection, etc. */
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uint16_t mdi_nlinks; /* how many links to this file */
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int16_t mdi_uid; /* user id of the file's owner */
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uint16_t mdi_gid; /* group number */
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uint32_t mdi_size; /* current file size in bytes */
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uint32_t mdi_atime; /* time of last access */
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uint32_t mdi_mtime; /* when was file data last changed */
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uint32_t mdi_ctime; /* when was inode itself changed */
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zone_t mdi_zone[NR_TZONES]; /* zone numbers for direct, ind, and
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dbl ind */
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};
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/* Maximum Minix MFS on-disk directory filename.
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* MFS uses 'struct direct' to write and parse
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* directory entries, so this can't be changed
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* without breaking filesystems.
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*/
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#define MFS_DIRSIZ 60
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struct mfs_direct {
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uint32_t mfsd_ino;
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char mfsd_name[MFS_DIRSIZ];
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} __packed;
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struct mfs_sblock {
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uint32_t mfs_ninodes; /* # usable inodes on the minor device */
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zone1_t mfs_nzones; /* total device size, including bit maps etc */
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int16_t mfs_imap_blocks; /* # of blocks used by inode bit map */
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int16_t mfs_zmap_blocks; /* # of blocks used by zone bit map */
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zone1_t mfs_firstdatazone_old;/* number of first data zone (small) */
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int16_t mfs_log_zone_size; /* log2 of blocks/zone */
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int16_t mfs_pad; /* try to avoid compiler-dependent padding */
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int32_t mfs_max_size; /* maximum file size on this device */
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zone_t mfs_zones; /* number of zones (replaces s_nzones in V2) */
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int16_t mfs_magic; /* magic number to recognize super-blocks */
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int16_t mfs_pad2; /* try to avoid compiler-dependent padding */
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uint16_t mfs_block_size; /* block size in bytes. */
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char mfs_disk_version; /* filesystem format sub-version */
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/* The following items are only used when the super_block is in memory,
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* mfs_inodes_per_block must be the firs one (see SBSIZE)
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*/
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unsigned mfs_inodes_per_block; /* precalculated from magic number */
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zone_t mfs_firstdatazone; /* number of first data zone (big) */
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int32_t mfs_bshift; /* ``lblkno'' calc of logical blkno */
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int32_t mfs_bmask; /* ``blkoff'' calc of blk offsets */
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int64_t mfs_qbmask; /* ~fs_bmask - for use with quad size */
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int32_t mfs_fsbtodb; /* fsbtodb and dbtofsb shift constant */
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};
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#define LOG_MINBSIZE 10
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#define MINBSIZE (1 << LOG_MINBSIZE)
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#define SUPER_MAGIC 0x4d5a /* magic # for MFSv3 file systems */
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#define ROOT_INODE ((uint32_t) 1) /* inode number for root directory */
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#define SUPER_BLOCK_OFF (1024) /* bytes offset */
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#define START_BLOCK ((block_t) 2) /* first fs block (not counting SB) */
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/* # bytes/dir entry */
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#define DIR_ENTRY_SIZE sizeof(struct mfs_direct)
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/* # dir entries/blk */
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#define NR_DIR_ENTRIES(fs) ((fs)->mfs_block_size/DIR_ENTRY_SIZE)
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/* mfs_sblock on-disk part size */
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#define SBSIZE offsetof(struct mfs_sblock, mfs_inodes_per_block)
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#define ZONE_NUM_SIZE sizeof(zone_t) /* # bytes in zone */
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#define INODE_SIZE sizeof(struct mfs_dinode) /* bytes in dsk ino */
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/* # zones/indir block */
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#define NINDIR(fs) ((fs)->mfs_block_size/ZONE_NUM_SIZE)
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#define NO_ZONE ((zone_t) 0) /* absence of a zone number */
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#define NO_BLOCK ((block_t) 0) /* absence of a block number */
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/* Turn file system block numbers into disk block addresses */
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#define fsbtodb(fs, b) ((b) << (fs)->mfs_fsbtodb)
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#define ino_to_fsba(fs, x) \
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(((x) - 1) / (fs)->mfs_inodes_per_block + \
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START_BLOCK + (fs)->mfs_imap_blocks + (fs)->mfs_zmap_blocks)
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#define ino_to_fsbo(fs, x) (((x) - 1) % (fs)->mfs_inodes_per_block)
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/*
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* MFS metadatas are stored in little-endian byte order. These macros
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* helps reading theses metadatas.
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*/
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#if BYTE_ORDER == LITTLE_ENDIAN
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# define fs2h16(x) (x)
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# define fs2h32(x) (x)
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# define mfs_sbload(old, new) \
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memcpy((new), (old), SBSIZE);
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# define mfs_iload(old, new) \
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memcpy((new),(old),sizeof(struct mfs_dinode))
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#else
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void minixfs3_sb_bswap(struct mfs_sblock *, struct mfs_sblock *);
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void minixfs3_i_bswap(struct mfs_dinode *, struct mfs_dinode *);
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# define fs2h16(x) bswap16(x)
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# define fs2h32(x) bswap32(x)
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# define mfs_sbload(old, new) minixfs3_sb_bswap((old), (new))
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# define mfs_iload(old, new) minixfs3_i_bswap((old), (new))
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#endif /* BYTE_ORDER == LITTLE_ENDIAN */
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/*
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* The following macros optimize certain frequently calculated
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* quantities by using shifts and masks in place of divisions
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* modulos and multiplications.
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*/
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#define blkoff(fs, loc) /* calculates (loc % fs->mfs_bsize) */ \
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((loc) & (fs)->mfs_qbmask)
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#define lblkno(fs, loc) /* calculates (loc / fs->mfs_bsize) */ \
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((loc) >> (fs)->mfs_bshift)
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/* Flag bits for i_mode in the inode. */
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#define I_TYPE 0170000 /* this field gives inode type */
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#define I_UNIX_SOCKET 0140000 /* unix domain socket */
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#define I_SYMBOLIC_LINK 0120000 /* file is a symbolic link */
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#define I_REGULAR 0100000 /* regular file, not dir or special */
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#define I_BLOCK_SPECIAL 0060000 /* block special file */
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#define I_DIRECTORY 0040000 /* file is a directory */
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#define I_CHAR_SPECIAL 0020000 /* character special file */
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#define I_NAMED_PIPE 0010000 /* named pipe (FIFO) */
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#define I_SET_UID_BIT 0004000 /* set effective uid_t on exec */
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#define I_SET_GID_BIT 0002000 /* set effective gid_t on exec */
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#define I_SET_STCKY_BIT 0001000 /* sticky bit */
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#define ALL_MODES 0007777 /* all bits for user, group and others */
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#define RWX_MODES 0000777 /* mode bits for RWX only */
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#define R_BIT 0000004 /* Rwx protection bit */
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#define W_BIT 0000002 /* rWx protection bit */
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#define X_BIT 0000001 /* rwX protection bit */
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#define I_NOT_ALLOC 0000000 /* this inode is free */
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#endif /* MINIX_FS_3_H */
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