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-.\" Copyright (C) 1993 Rickard E. Faith <faith@cs.unc.edu>
-.\" and Copyright (C) 1994 Andries E. Brouwer <aeb@cwi.nl>
-.\" and Copyright (C) 2002, 2005 Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" 2008-10-06, mtk: Created this as a new page by splitting
-.\"     umount/umount2 material out of mount.2
-.\"
-.TH umount 2 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-umount, umount2 \- unmount filesystem
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B "#include <sys/mount.h>"
-.P
-.BI "int umount(const char *" target );
-.BI "int umount2(const char *" target ", int " flags );
-.fi
-.SH DESCRIPTION
-.BR umount ()
-and
-.BR umount2 ()
-remove the attachment of the (topmost) filesystem mounted on
-.IR target .
-.\" Note: the kernel naming differs from the glibc naming
-.\" umount2 is the glibc name for what the kernel now calls umount
-.\" and umount is the glibc name for oldumount
-.P
-Appropriate privilege (Linux: the
-.B CAP_SYS_ADMIN
-capability) is required to unmount filesystems.
-.P
-Linux 2.1.116 added the
-.BR umount2 ()
-system call, which, like
-.BR umount (),
-unmounts a target, but allows additional
-.I flags
-controlling the behavior of the operation:
-.TP
-.BR MNT_FORCE " (since Linux 2.1.116)"
-Ask the filesystem to abort pending requests before attempting the
-unmount.
-This may allow the unmount to complete without waiting
-for an inaccessible server, but could cause data loss.
-If, after aborting requests,
-some processes still have active references to the filesystem,
-the unmount will still fail.
-As at Linux 4.12,
-.B MNT_FORCE
-is supported only on the following filesystems:
-9p (since Linux 2.6.16),
-ceph (since Linux 2.6.34),
-cifs (since Linux 2.6.12),
-fuse (since Linux 2.6.16),
-lustre (since Linux 3.11),
-and NFS (since Linux 2.1.116).
-.TP
-.BR MNT_DETACH " (since Linux 2.4.11)"
-Perform a lazy unmount: make the mount unavailable for new
-accesses, immediately disconnect the filesystem and all filesystems
-mounted below it from each other and from the mount table, and
-actually perform the unmount when the mount ceases to be busy.
-.TP
-.BR MNT_EXPIRE " (since Linux 2.6.8)"
-Mark the mount as expired.
-If a mount is not currently in use, then an initial call to
-.BR umount2 ()
-with this flag fails with the error
-.BR EAGAIN ,
-but marks the mount as expired.
-The mount remains expired as long as it isn't accessed
-by any process.
-A second
-.BR umount2 ()
-call specifying
-.B MNT_EXPIRE
-unmounts an expired mount.
-This flag cannot be specified with either
-.B MNT_FORCE
-or
-.BR MNT_DETACH .
-.TP
-.BR UMOUNT_NOFOLLOW " (since Linux 2.6.34)"
-.\" Later added to Linux 2.6.33-stable
-Don't dereference
-.I target
-if it is a symbolic link.
-This flag allows security problems to be avoided in set-user-ID-\fIroot\fP
-programs that allow unprivileged users to unmount filesystems.
-.SH RETURN VALUE
-On success, zero is returned.
-On error, \-1 is returned, and
-.I errno
-is set to indicate the error.
-.SH 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 Linux kernel source code for details.
-.TP
-.B EAGAIN
-A call to
-.BR umount2 ()
-specifying
-.B MNT_EXPIRE
-successfully marked an unbusy filesystem as expired.
-.TP
-.B EBUSY
-.I target
-could not be unmounted because it is busy.
-.TP
-.B EFAULT
-.I target
-points outside the user address space.
-.TP
-.B EINVAL
-.I target
-is not a mount point.
-.TP
-.B EINVAL
-.I target
-is locked; see
-.BR mount_namespaces (7).
-.TP
-.B EINVAL
-.BR umount2 ()
-was called with
-.B MNT_EXPIRE
-and either
-.B MNT_DETACH
-or
-.BR MNT_FORCE .
-.TP
-.BR EINVAL " (since Linux 2.6.34)"
-.BR umount2 ()
-was called with an invalid flag value in
-.IR flags .
-.TP
-.B ENAMETOOLONG
-A pathname was longer than
-.BR MAXPATHLEN .
-.TP
-.B ENOENT
-A pathname was empty or had a nonexistent component.
-.TP
-.B ENOMEM
-The kernel could not allocate a free page to copy filenames or data into.
-.TP
-.B EPERM
-The caller does not have the required privileges.
-.SH STANDARDS
-Linux.
-.SH HISTORY
-.B MNT_DETACH
-and
-.B MNT_EXPIRE
-.\" http://sourceware.org/bugzilla/show_bug.cgi?id=10092
-are available since glibc 2.11.
-.P
-The original
-.BR umount ()
-function was called as \fIumount(device)\fP and would return
-.B ENOTBLK
-when called with something other than a block device.
-In Linux 0.98p4, a call \fIumount(dir)\fP was added, in order to
-support anonymous devices.
-In Linux 2.3.99-pre7, the call \fIumount(device)\fP was removed,
-leaving only \fIumount(dir)\fP (since now devices can be mounted
-in more than one place, so specifying the device does not suffice).
-.SH NOTES
-.SS umount() and shared mounts
-Shared mounts cause any mount activity on a mount, including
-.BR umount ()
-operations, to be forwarded to every shared mount in the
-peer group and every slave mount of that peer group.
-This means that
-.BR umount ()
-of any peer in a set of shared mounts will cause all of its
-peers to be unmounted and all of their slaves to be unmounted as well.
-.P
-This propagation of unmount activity can be particularly surprising
-on systems where every mount is shared by default.
-On such systems,
-recursively bind mounting the root directory of the filesystem
-onto a subdirectory and then later unmounting that subdirectory with
-.B MNT_DETACH
-will cause every mount in the mount namespace to be lazily unmounted.
-.P
-To ensure
-.BR umount ()
-does not propagate in this fashion,
-the mount may be remounted using a
-.BR mount (2)
-call with a
-.I mount_flags
-argument that includes both
-.B MS_REC
-and
-.B MS_PRIVATE
-prior to
-.BR umount ()
-being called.
-.SH SEE ALSO
-.BR mount (2),
-.BR mount_namespaces (7),
-.BR path_resolution (7),
-.BR mount (8),
-.BR umount (8)