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zfs/lib/libspl/include/sys/mount.h

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Add linux libspl support All changes needed for the libspl layer. This includes modifications to files directly copied from OpenSolaris and the addition of new files needed to fill in the gaps. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2010-08-26 18:50:56 +00:00
/*
* 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
Add 'zfs mount' support By design the zfs utility is supposed to handle mounting and unmounting a zfs filesystem. We could allow zfs to do this directly. There are system calls available to mount/umount a filesystem. And there are library calls available to manipulate /etc/mtab. But there are a couple very good reasons not to take this appraoch... for now. Instead of directly calling the system and library calls to (u)mount the filesystem we fork and exec a (u)mount process. The principle reason for this is to delegate the responsibility for locking and updating /etc/mtab to (u)mount(8). This ensures maximum portability and ensures the right locking scheme for your version of (u)mount will be used. If we didn't do this we would have to resort to an autoconf test to determine what locking mechanism is used. The downside to using mount(8) instead of mount(2) is that we lose the exact errno which was returned by the kernel. The return code from mount(8) provides some insight in to what went wrong but it not quite as good. For the moment this is translated as a best guess in to a errno for the higher layers of zfs. In the long term a shared library called libmount is under development which provides a common API to address the locking and errno issues. Once the standard mount utility has been updated to use this library we can then leverage it. Until then this is the only safe solution. http://www.kernel.org/pub/linux/utils/util-linux/libmount-docs/index.html
2010-12-17 00:16:25 +00:00
#define MS_USERS 0x40000000
#define MS_OWNER 0x10000000
#define MS_GROUP 0x08000000
#define MS_COMMENT 0x02000000
#define MS_FORCE MNT_FORCE
#define MS_DETACH MNT_DETACH
Add linux libspl support All changes needed for the libspl layer. This includes modifications to files directly copied from OpenSolaris and the addition of new files needed to fill in the gaps. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2010-08-26 18:50:56 +00:00
#endif /* _LIBSPL_SYS_MOUNT_H */