mirror of
https://git.proxmox.com/git/mirror_zfs.git
synced 2024-11-18 10:21:01 +03:00
e18be9a637
Linux supports mounting over non-empty directories by default. In Solaris this is not the case and -O option is required for zfs mount to mount a zfs filesystem over a non-empty directory. For compatibility, I've added support for -O option to mount zfs filesystems over non-empty directories if the user wants to, just like in Solaris. I've defined MS_OVERLAY to record it in the flags variable if the -O option is supplied. The flags variable passes through a few functions and its checked before performing the empty directory check in zfs_mount function. If -O is given, the check is not performed. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #473
84 lines
2.3 KiB
C
84 lines
2.3 KiB
C
/*
|
|
* 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 http://www.opensolaris.org/os/licensing.
|
|
* 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 <sys/mntent.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
|
|
|
|
#define MS_USERS 0x40000000
|
|
#define MS_OWNER 0x10000000
|
|
#define MS_GROUP 0x08000000
|
|
#define MS_COMMENT 0x02000000
|
|
|
|
/*
|
|
* 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
|
|
|
|
#endif /* _LIBSPL_SYS_MOUNT_H */
|