The
.B MS_RELATIME
flag is also settable on a per-mount-point basis.
+Since Linux 2.6.16,
+.B MS_RDONLY
+can be set or cleared on a per-mount-point basis as well as on
+the underlying filesystem. The mounted filesystem will only be
+writable if neither the filesystem nor the mountpoint are flagged as
+read-only.
.\"
.SS Remounting an existing mount
An existing mount may be remounted by specifying
arguments should match the values used in the original
.BR mount ()
call, except for those parameters that are being deliberately changed.
+Another exception is that
+.B MS_BIND
+has a different meaning for remount, and it should only be included if
+explicitly desired.
The following
.I mountflags
(rather than defaulting to
.BR MS_RELATIME ).
-Since Linux 2.6.26, this flag can also be used to make
+Since Linux 2.6.26, this flag can be used with
+.B MS_BIND
+to only modify the per-mount-point flags.
.\" See https://lwn.net/Articles/281157/
-an existing bind mount read-only by specifying
+This is particularly useful for setting or clearing the "read-only"
+flag on a mount point without changing the underlying filesystem.
+Specifying
.IR mountflags
as:
MS_REMOUNT | MS_BIND | MS_RDONLY
-Note that only the
-.BR MS_RDONLY
-setting of the bind mount can be changed in this manner.
+will make access through this mountpoint read-only, without affecting
+other mount points.
.\"
.SS Creating a bind mount
If