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

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