104 lines
3.9 KiB
C
104 lines
3.9 KiB
C
/****************************************************************************
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* include/sys/mount.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __INCLUDE_SYS_MOUNT_H
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#define __INCLUDE_SYS_MOUNT_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/compiler.h>
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#include <nuttx/fs/ioctl.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define BLKSSZGET BIOC_BLKSSZGET
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/* Mount flags */
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#define MS_RDONLY 1 /* Mount file system read-only */
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/* Un-mount flags
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*
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* These flags control the behavior of umount2() when there are open file
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* references through the mountpoint. umount2() with no flag bits set is
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* equivalent to umount(), i.e., the umount() will fail with EBUSY if there
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* are open references on the file.
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*
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* MNT_FORCE - Force unmount even if busy. This can cause data loss.
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* MNT_DETACH - Perform a lazy unmount: make the mount point unavailable
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* for new accesses, and actually perform the unmount when the mount
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* point ceases to be busy.
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* MNT_EXPIRE - Mark the mount point as expired. If a mount point is not
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* currently in use, then an initial call to umount2() with this flag
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* fails with the error EAGAIN, but marks the mount point as expired. The
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* mount point remains expired as long as it isn't accessed by any
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* process. A second umount2() call specifying MNT_EXPIRE unmounts an
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* expired mount point. This flag cannot be specified with either
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* MNT_FORCE or MNT_DETACH.
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* UMOUNT_NOFOLLOW (- Don't dereference target if it is a symbolic link.
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* For Linux, this flag allows security problems to be avoided in
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* set-user-ID-root programs that allow unprivileged users to unmount
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* file systems. For NuttX, it is provided only for compatibility
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*
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* Not all options are supported on all file systems.
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*/
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#define MNT_FORCE (1 << 0)
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#define MNT_DETACH (1 << 1)
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#define MNT_EXPIRE (1 << 2)
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#define UMOUNT_NOFOLLOW (0)
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/* umount() is equivalent to umount2() with flags = 0 */
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#define umount(t) umount2(t,0)
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/****************************************************************************
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* Public Type Definitions
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****************************************************************************/
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#undef EXTERN
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#if defined(__cplusplus)
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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int mount(FAR const char *source, FAR const char *target,
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FAR const char *filesystemtype, unsigned long mountflags,
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FAR const void *data);
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int umount2(FAR const char *target, unsigned int flags);
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#undef EXTERN
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#if defined(__cplusplus)
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}
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#endif
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#endif /* __INCLUDE_SYS_MOUNT_H */
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