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

     /*-
      * Copyright (c) 1982, 1986, 1989, 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.
     *
     *      @(#)ufsmount.h  8.6 (Berkeley) 3/30/95
     * $FreeBSD$
     */
    
    #ifndef _FS_EXT2FS_EXT2_MOUNT_H_
    #define _FS_EXT2FS_EXT2_MOUNT_H_
    
    #ifdef _KERNEL
    
    #ifdef MALLOC_DECLARE
    MALLOC_DECLARE(M_EXT2NODE);
    #endif
    
    struct vnode;
    
    /* This structure describes the ext2fs specific mount structure data. */
    struct ext2mount {
            struct  mount *um_mountp;               /* filesystem vfs structure */
            struct  cdev *um_dev;                   /* device mounted */
            struct  vnode *um_devvp;                /* block device mounted vnode */
    
            struct  m_ext2fs *um_e2fs;              /* EXT2FS */
    
            u_long  um_nindir;                      /* indirect ptrs per block */
            u_long  um_bptrtodb;                    /* indir ptr to disk block */
            u_long  um_seqinc;                      /* inc between seq blocks */
    
            struct mtx um_lock;                     /* Protects ext2mount & fs */
    
            struct g_consumer *um_cp;
            struct bufobj *um_bo;
    };
    
    #define EXT2_LOCK(aa)           mtx_lock(&(aa)->um_lock)
    #define EXT2_UNLOCK(aa) mtx_unlock(&(aa)->um_lock)
    #define EXT2_MTX(aa)            (&(aa)->um_lock)
    
    /* Convert mount ptr to ext2fsmount ptr. */
    #define VFSTOEXT2(mp)   ((struct ext2mount *)((mp)->mnt_data))
    
    /*
     * Macros to access file system parameters in the ufsmount structure.
     * Used by ufs_bmap.
     */
    #define MNINDIR(ump)                    ((ump)->um_nindir)
    #define blkptrtodb(ump, b)              ((b) << (ump)->um_bptrtodb)
    #define is_sequential(ump, a, b)        ((b) == (a) + ump->um_seqinc)
    #endif  /* _KERNEL */
    
    #endif  /* !_FS_EXT2FS_EXT2_MOUNT_H_ */

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