is on a read-only filesystem.
.TP
.BR \-N , " \-\-namespace " \fIns
-Perform mount in namespace specified by \fIns\fR.
+Perform mount in the mount namespace specified by \fIns\fR.
\fIns\fR is either PID of process running in that namespace
or special file representing that namespace.
.sp
.BR mount (8)
-switches to the namespace when it reads /etc/fstab, writes /etc/mtab (or writes to /run/mount) and calls
+switches to the mount namespace when it reads /etc/fstab,
+writes /etc/mtab (or writes to /run/mount) and calls
.BR mount (2)
-system call, otherwise it runs in the original namespace. It means that the target namespace does not have
+system call, otherwise it runs in the original mount namespace.
+It means that the target namespace does not have
to contain any libraries or another requirements necessary to execute
.BR mount (2)
command.
.sp
-See \fBnamespaces\fR(7) for more information.
+See \fBmount_namespaces\fR(7) for more information.
.TP
.BR \-O , " \-\-test\-opts " \fIopts
Limit the set of filesystems to which the
.BR fstab (5),
.BR nfs (5),
.BR xfs (5),
+.BR mount_namespaces (7)
.BR e2label (8),
.BR findmnt (8),
.BR losetup (8),
umount option.
.TP
.BR \-A , " \-\-all\-targets"
-Unmount all mountpoints in the current namespace for the specified filesystem.
+Unmount all mountpoints in the current mount namespace
+for the specified filesystem.
The filesystem can be specified by one of the mountpoints or the device name (or
UUID, etc.). When this option is used together with \fB\-\-recursive\fR, then
all nested mounts within the filesystem are recursively unmounted.
.TP
.BR \-N , " \-\-namespace " \fIns
-Perform umount in namespace specified by \fIns\fR.
+Perform umount in the mount namespace specified by \fIns\fR.
\fIns\fR is either PID of process running in that namespace
or special file representing that namespace.
.sp
.BR umount (8)
switches to the namespace when it reads /etc/fstab, writes /etc/mtab (or writes to /run/mount) and calls
.BR umount (2)
-system call, otherwise it runs in the original namespace. It means that the target namespace does not have
+system call, otherwise it runs in the original namespace.
+It means that the target mount namespace does not have
to contain any libraries or another requirements necessary to execute
.BR umount (2)
command.
.sp
-See \fBnamespaces\fR(7) for more information.
+See \fBmount_namespaces\fR(7) for more information.
.TP
.BR \-n , " \-\-no\-mtab"
Unmount without writing in
.SH SEE ALSO
.BR umount (2),
.BR losetup (8),
+.BR mount_namespaces (7)
.BR mount (8)
.SH AVAILABILITY
The umount command is part of the util-linux package and is available from