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umount (2)
  • umount (2) ( Solaris man: Системные вызовы )
  • umount (2) ( Русские man: Системные вызовы )
  • >> umount (2) ( Linux man: Системные вызовы )
  • umount (8) ( FreeBSD man: Команды системного администрирования )
  • umount (8) ( Русские man: Команды системного администрирования )
  • umount (8) ( Linux man: Команды системного администрирования )
  •  

    NAME

    umount, umount2 - unmount file system
     
    

    SYNOPSIS

    #include <sys/mount.h>
    
    int umount(const char *target);
    
    int umount2(const char *target, int flags);
    
     

    DESCRIPTION

    umount() and umount2() remove the attachment of the (topmost) file system mounted on target.

    Appropriate privilege (Linux: the CAP_SYS_ADMIN capability) is required to unmount file systems.

    Linux 2.1.116 added the umount2() system call, which, like umount(), unmounts a target, but allows additional flags controlling the behavior of the operation:

    MNT_FORCE (since Linux 2.1.116)
    Force unmount even if busy. This can cause data loss. (Only for NFS mounts.)
    MNT_DETACH (since Linux 2.4.11)
    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 (since Linux 2.6.8)
    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.
     

    RETURN VALUE

    On success, zero is returned. On error, -1 is returned, and errno is set appropriately.  

    ERRORS

    The error values given below result from filesystem type independent errors. Each filesystem type may have its own special errors and its own special behavior. See the kernel source code for details.
    EAGAIN
    A call to umount2() specifying MNT_EXPIRE successfully marked an unbusy file system as expired.
    EBUSY
    target could not be unmounted because it is busy.
    EFAULT
    target points outside the user address space.
    EINVAL
    target is not a mount point. Or, umount2() was called with MNT_EXPIRE and either MNT_DETACH or MNT_FORCE.
    ENAMETOOLONG
    A pathname was longer than MAXPATHLEN.
    ENOENT
    A pathname was empty or had a nonexistent component.
    ENOMEM
    The kernel could not allocate a free page to copy filenames or data into.
    EPERM
    The caller does not have the required privileges.
     

    CONFORMING TO

    These functions are Linux-specific and should not be used in programs intended to be portable.  

    NOTES

    The original umount() function was called as umount(device) and would return ENOTBLK when called with something other than a block device. In Linux 0.98p4 a call umount(dir) was added, in order to support anonymous devices. In Linux 2.3.99-pre7 the call umount(device) was removed, leaving only umount(dir) (since now devices can be mounted in more than one place, so specifying the device does not suffice).  

    SEE ALSO

    mount(2), path_resolution(7), mount(8), umount(8)  

    COLOPHON

    This page is part of release 3.14 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    CONFORMING TO
    NOTES
    SEE ALSO
    COLOPHON


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