The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/ext2fs/ext2_mount.h

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    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: releng/9.1/sys/fs/ext2fs/ext2_mount.h 218176 2011-02-01 18:30:52Z jhb $
   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
   39 MALLOC_DECLARE(M_EXT2NODE);
   40 #endif
   41 
   42 struct vnode;
   43 
   44 /* This structure describes the ext2fs specific mount structure data. */
   45 struct 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 #define em_e2fsb um_e2fs->e2fs
   52 
   53         u_long  um_nindir;                      /* indirect ptrs per block */
   54         u_long  um_bptrtodb;                    /* indir ptr to disk block */
   55         u_long  um_seqinc;                      /* inc between seq blocks */
   56 
   57         struct mtx um_lock;                     /* Protects ext2mount & fs */
   58 
   59         struct g_consumer *um_cp;
   60         struct bufobj *um_bo;
   61 };
   62 
   63 #define EXT2_LOCK(aa)           mtx_lock(&(aa)->um_lock)
   64 #define EXT2_UNLOCK(aa) mtx_unlock(&(aa)->um_lock)
   65 #define EXT2_MTX(aa)            (&(aa)->um_lock)
   66 
   67 /* Convert mount ptr to ext2fsmount ptr. */
   68 #define VFSTOEXT2(mp)   ((struct ext2mount *)((mp)->mnt_data))
   69 
   70 /*
   71  * Macros to access file system parameters in the ufsmount structure.
   72  * Used by ufs_bmap.
   73  */
   74 #define MNINDIR(ump)                    ((ump)->um_nindir)
   75 #define blkptrtodb(ump, b)              ((b) << (ump)->um_bptrtodb)
   76 #define is_sequential(ump, a, b)        ((b) == (a) + ump->um_seqinc)
   77 #endif /* _KERNEL */
   78 
   79 #endif  /* !_FS_EXT2FS_EXT2_MOUNT_H_ */

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