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/****************************************************************************
* include/sys/mount.h
*
* Copyright (C) 2007-2009, 2015 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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.
* 3. Neither the name NuttX 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 COPYRIGHT HOLDERS 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
* COPYRIGHT OWNER 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.
*
****************************************************************************/
#ifndef __INCLUDE_SYS_MOUNT_H
#define __INCLUDE_SYS_MOUNT_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/compiler.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Mount flags */
#define MS_RDONLY 1 /* Mount file system read-only */
/* Un-mount flags
*
* These flags control the behavior of umount2() when there are open file
* references through the mountpoint. umount2() with no flag bits set is
* equivalent to umount(), i.e., the umount() will fail with EBUSY if there
* are open references on the file.
*
* MNT_FORCE - Force unmount even if busy. This can cause data loss.
* MNT_DETACH - Perform a lazy unmount: make the mount point unavailable
* for new accesses, and actually perform the unmount when the mount
* point ceases to be busy.
* MNT_EXPIRE - Mark the mount point as expired. If a mount point is not
* currently in use, then an initial call to umount2() with this flag
* fails with the error EAGAIN, but marks the mount point as expired. The
* mount point remains expired as long as it isn't accessed by any
* process. A second umount2() call specifying MNT_EXPIRE unmounts an
* expired mount point. This flag cannot be specified with either
* MNT_FORCE or MNT_DETACH.
* UMOUNT_NOFOLLOW (- Don't dereference target if it is a symbolic link.
* For Linux, this flag allows security problems to be avoided in
* set-user-ID-root programs that allow unprivileged users to unmount
* file systems. For NuttX, it is provided only for compatibility
*
* Not all options are supported on all file systems.
*/
#define MNT_FORCE (1 << 0)
#define MNT_DETACH (1 << 1)
#define MNT_EXPIRE (1 << 2)
#define UMOUNT_NOFOLLOW (0)
/* mount() is equivalent to umount2() with flags = 0 */
#define umount(t) umount2(t,0)
/****************************************************************************
* Public Type Definitions
****************************************************************************/
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
#undef EXTERN
#if defined(__cplusplus)
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif
int mount(FAR const char *source, FAR const char *target,
FAR const char *filesystemtype, unsigned long mountflags,
FAR const void *data);
int umount2(FAR const char *target, unsigned int flags);
#undef EXTERN
#if defined(__cplusplus)
}
#endif
#endif /* __INCLUDE_SYS_MOUNT_H */
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