FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/lib/libspl/include/os/linux/sys/mount.h

     /*
      * CDDL HEADER START
      *
      * The contents of this file are subject to the terms of the
      * Common Development and Distribution License, Version 1.0 only
      * (the "License").  You may not use this file except in compliance
      * with the License.
      *
      * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
     * or https://opensource.org/licenses/CDDL-1.0.
     * See the License for the specific language governing permissions
     * and limitations under the License.
     *
     * When distributing Covered Code, include this CDDL HEADER in each
     * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     * If applicable, add the following below this CDDL HEADER, with the
     * fields enclosed by brackets "[]" replaced with your own identifying
     * information: Portions Copyright [yyyy] [name of copyright owner]
     *
     * CDDL HEADER END
     */
    /*
     * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
     * Use is subject to license terms.
     */
    
    #include_next <sys/mount.h>
    
    #ifndef _LIBSPL_SYS_MOUNT_H
    #define _LIBSPL_SYS_MOUNT_H
    
    #include <assert.h>
    #include <string.h>
    #include <stdlib.h>
    
    /*
     * Some old glibc headers don't define BLKGETSIZE64
     * and we don't want to require the kernel headers
     */
    #if !defined(BLKGETSIZE64)
    #define BLKGETSIZE64            _IOR(0x12, 114, size_t)
    #endif
    
    /*
     * Some old glibc headers don't correctly define MS_DIRSYNC and
     * instead use the enum name S_WRITE.  When using these older
     * headers define MS_DIRSYNC to be S_WRITE.
     */
    #if !defined(MS_DIRSYNC)
    #define MS_DIRSYNC              S_WRITE
    #endif
    
    /*
     * Some old glibc headers don't correctly define MS_POSIXACL and
     * instead leave it undefined.  When using these older headers define
     * MS_POSIXACL to the reserved value of (1<<16).
     */
    #if !defined(MS_POSIXACL)
    #define MS_POSIXACL             (1<<16)
    #endif
    
    #define MS_USERS        (MS_NOEXEC|MS_NOSUID|MS_NODEV)
    #define MS_OWNER        (MS_NOSUID|MS_NODEV)
    #define MS_GROUP        (MS_NOSUID|MS_NODEV)
    #define MS_COMMENT      0
    
    /*
     * Older glibc <sys/mount.h> headers did not define all the available
     * umount2(2) flags.  Both MNT_FORCE and MNT_DETACH are supported in the
     * kernel back to 2.4.11 so we define them correctly if they are missing.
     */
    #ifdef MNT_FORCE
    #define MS_FORCE        MNT_FORCE
    #else
    #define MS_FORCE        0x00000001
    #endif /* MNT_FORCE */
    
    #ifdef MNT_DETACH
    #define MS_DETACH       MNT_DETACH
    #else
    #define MS_DETACH       0x00000002
    #endif /* MNT_DETACH */
    
    /*
     * Overlay mount is default in Linux, but for solaris/zfs
     * compatibility, MS_OVERLAY is defined to explicitly have the user
     * provide a flag (-O) to mount over a non empty directory.
     */
    #define MS_OVERLAY      0x00000004
    
    /*
     * MS_CRYPT indicates that encryption keys should be loaded if they are not
     * already available. This is not defined in glibc, but it is never seen by
     * the kernel so it will not cause any problems.
     */
    #define MS_CRYPT        0x00000008
    
    #endif /* _LIBSPL_SYS_MOUNT_H */

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