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Diffstat (limited to 'sys/gnu/ext2fs/fs.h')
| -rw-r--r-- | sys/gnu/ext2fs/fs.h | 170 |
1 files changed, 0 insertions, 170 deletions
diff --git a/sys/gnu/ext2fs/fs.h b/sys/gnu/ext2fs/fs.h deleted file mode 100644 index 0339916..0000000 --- a/sys/gnu/ext2fs/fs.h +++ /dev/null @@ -1,170 +0,0 @@ -/*- - * modified for EXT2FS support in Lites 1.1 - * - * Aug 1995, Godmar Back (gback@cs.utah.edu) - * University of Utah, Department of Computer Science - */ -/*- - * Copyright (c) 1982, 1986, 1993 - * The Regents of the University of California. All rights reserved. - * - * 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. - * 4. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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. - * - * @(#)fs.h 8.7 (Berkeley) 4/19/94 - * $FreeBSD$ - */ - -/* - * Each disk drive contains some number of file systems. - * A file system consists of a number of cylinder groups. - * Each cylinder group has inodes and data. - * - * A file system is described by its super-block, which in turn - * describes the cylinder groups. The super-block is critical - * data and is replicated in each cylinder group to protect against - * catastrophic loss. This is done at `newfs' time and the critical - * super-block data does not change, so the copies need not be - * referenced further unless disaster strikes. - * - * The first boot and super blocks are given in absolute disk addresses. - * The byte-offset forms are preferred, as they don't imply a sector size. - */ -#define SBSIZE 1024 -#define SBLOCK 2 - -/* - * The path name on which the file system is mounted is maintained - * in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in - * the super block for this name. - */ -#define MAXMNTLEN 512 - -/* - * Macros for access to superblock array structures - */ - -/* - * Convert cylinder group to base address of its global summary info. - */ -#define fs_cs(fs, cgindx) (((struct ext2_group_desc *) \ - (fs->s_group_desc[cgindx / EXT2_DESC_PER_BLOCK(fs)]->b_data)) \ - [cgindx % EXT2_DESC_PER_BLOCK(fs)]) - -/* - * Turn file system block numbers into disk block addresses. - * This maps file system blocks to device size blocks. - */ -#define fsbtodb(fs, b) ((b) << ((fs)->s_fsbtodb)) -#define dbtofsb(fs, b) ((b) >> ((fs)->s_fsbtodb)) - -/* get group containing inode */ -#define ino_to_cg(fs, x) (((x) - 1) / EXT2_INODES_PER_GROUP(fs)) - -/* get block containing inode from its number x */ -#define ino_to_fsba(fs, x) fs_cs(fs, ino_to_cg(fs, x)).bg_inode_table + \ - (((x)-1) % EXT2_INODES_PER_GROUP(fs))/EXT2_INODES_PER_BLOCK(fs) - -/* get offset for inode in block */ -#define ino_to_fsbo(fs, x) ((x-1) % EXT2_INODES_PER_BLOCK(fs)) - -/* - * Give cylinder group number for a file system block. - * Give cylinder group block number for a file system block. - */ -#define dtog(fs, d) (((d) - fs->s_es->s_first_data_block) / \ - EXT2_BLOCKS_PER_GROUP(fs)) -#define dtogd(fs, d) (((d) - fs->s_es->s_first_data_block) % \ - EXT2_BLOCKS_PER_GROUP(fs)) - -/* - * The following macros optimize certain frequently calculated - * quantities by using shifts and masks in place of divisions - * modulos and multiplications. - */ -#define blkoff(fs, loc) /* calculates (loc % fs->fs_bsize) */ \ - ((loc) & (fs)->s_qbmask) - -#define lblktosize(fs, blk) /* calculates (blk * fs->fs_bsize) */ \ - ((blk) << (fs->s_bshift)) - -#define lblkno(fs, loc) /* calculates (loc / fs->fs_bsize) */ \ - ((loc) >> (fs->s_bshift)) - -/* no fragments -> logical block number equal # of frags */ -#define numfrags(fs, loc) /* calculates (loc / fs->fs_fsize) */ \ - ((loc) >> (fs->s_bshift)) - -#define fragroundup(fs, size) /* calculates roundup(size, fs->fs_fsize) */ \ - roundup(size, fs->s_frag_size) - /* was (((size) + (fs)->fs_qfmask) & (fs)->fs_fmask) */ - -/* - * Determining the size of a file block in the file system. - * easy w/o fragments - */ -#define blksize(fs, ip, lbn) ((fs)->s_frag_size) - -/* - * INOPB is the number of inodes in a secondary storage block. - */ -#define INOPB(fs) EXT2_INODES_PER_BLOCK(fs) - -/* - * NINDIR is the number of indirects in a file system block. - */ -#define NINDIR(fs) (EXT2_ADDR_PER_BLOCK(fs)) - -extern int inside[], around[]; -extern u_char *fragtbl[]; - -/* a few remarks about superblock locking/unlocking - * Linux provides special routines for doing so - * I haven't figured out yet what BSD does - * I think I'll try a VOP_LOCK/VOP_UNLOCK on the device vnode - */ -#define DEVVP(inode) (VFSTOEXT2(ITOV(inode)->v_mount)->um_devvp) -#define lock_super(devvp) vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, curthread) -#define unlock_super(devvp) VOP_UNLOCK(devvp, 0, curthread) - -/* - * Historically, ext2fs kept it's metadata buffers on the LOCKED queue. Now, - * we simply change the lock owner to kern so that it may be released from - * another context. Later, we release the buffer, and conditionally write it - * when we're done. - */ -#define LCK_BUF(bp) BUF_KERNPROC(bp); - -#define ULCK_BUF(bp) { \ - long flags; \ - int s; \ - s = splbio(); \ - flags = (bp)->b_flags; \ - (bp)->b_flags &= ~(B_DIRTY); \ - splx(s); \ - if (flags & B_DIRTY) \ - bwrite(bp); \ - else \ - brelse(bp); \ -} |
