ext2_mount.h revision 262723 
1/*-
2 * Copyright (c) 1982, 1986, 1989, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 *	@(#)ufsmount.h	8.6 (Berkeley) 3/30/95
30 * $FreeBSD: stable/10/sys/fs/ext2fs/ext2_mount.h 262723 2014-03-04 03:10:31Z pfg $
31 */
32
33#ifndef _FS_EXT2FS_EXT2_MOUNT_H_
34#define	_FS_EXT2FS_EXT2_MOUNT_H_
35
36#ifdef _KERNEL
37
38#ifdef MALLOC_DECLARE
39MALLOC_DECLARE(M_EXT2NODE);
40#endif
41
42struct vnode;
43
44/* This structure describes the ext2fs specific mount structure data. */
45struct ext2mount {
46	struct	mount *um_mountp;		/* filesystem vfs structure */
47	struct	cdev *um_dev;			/* device mounted */
48	struct	vnode *um_devvp;		/* block device mounted vnode */
49
50	struct	m_ext2fs *um_e2fs;		/* EXT2FS */
51
52	u_long	um_nindir;			/* indirect ptrs per block */
53	u_long	um_bptrtodb;			/* indir ptr to disk block */
54	u_long	um_seqinc;			/* inc between seq blocks */
55
56	struct mtx um_lock;			/* Protects ext2mount & fs */
57
58	struct g_consumer *um_cp;
59	struct bufobj *um_bo;
60};
61
62#define	EXT2_LOCK(aa)		mtx_lock(&(aa)->um_lock)
63#define	EXT2_UNLOCK(aa)	mtx_unlock(&(aa)->um_lock)
64#define	EXT2_MTX(aa)		(&(aa)->um_lock)
65
66/* Convert mount ptr to ext2fsmount ptr. */
67#define	VFSTOEXT2(mp)	((struct ext2mount *)((mp)->mnt_data))
68
69/*
70 * Macros to access file system parameters in the ufsmount structure.
71 * Used by ufs_bmap.
72 */
73#define	MNINDIR(ump)			((ump)->um_nindir)
74#define	blkptrtodb(ump, b)		((b) << (ump)->um_bptrtodb)
75#define	is_sequential(ump, a, b)	((b) == (a) + ump->um_seqinc)
76#endif /* _KERNEL */
77
78#endif	/* !_FS_EXT2FS_EXT2_MOUNT_H_ */
79