[PATCH 04/10] Manual pages: mount.8, umount.8: Clarify that "namespace" means "mount namespace"

["Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>]

There are various references to "namespaces" when it would be
clearer to say "mount namespaces". Also, add references to the
mount_namespaces(7) manual page.

Signed-off-by: Michael Kerrisk (man-pages) <mtk.manpages@gmail.com>
---
 sys-utils/mount.8  | 11 +++++++----
 sys-utils/umount.8 | 11 +++++++----
 2 files changed, 14 insertions(+), 8 deletions(-)

diff --git a/sys-utils/mount.8 b/sys-utils/mount.8
index 81bc225cb..fff060ad1 100644
--- a/sys-utils/mount.8
+++ b/sys-utils/mount.8
@@ -664,19 +664,21 @@ This is necessary for example when
 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
@@ -2680,6 +2682,7 @@ Karel Zak <kzak@redhat.com>
 .BR fstab (5),
 .BR nfs (5),
 .BR xfs (5),
+.BR mount_namespaces (7)
 .BR e2label (8),
 .BR findmnt (8),
 .BR losetup (8),
diff --git a/sys-utils/umount.8 b/sys-utils/umount.8
index 43363b11c..edcb6cc1f 100644
--- a/sys-utils/umount.8
+++ b/sys-utils/umount.8
@@ -68,7 +68,8 @@ filesystems. This list of the filesystems may be replaced by \fB\-\-types\fR
 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.
@@ -129,19 +130,20 @@ server or a network partition. Remounts of the share will not be possible.
 
 .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
@@ -278,6 +280,7 @@ command appeared in Version 6 AT&T UNIX.
 .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
-- 
2.26.2