mount.2, statfs.2: Add NOSYMFOLLOW flags to mount(2) and statfs(2)

Signed-off-by: Ross Zwisler <zwisler@google.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man2/mount.2

@@ -280,6 +280,16 @@ the
 flag to
 .BR open (2)
 was specified for all file opens to this filesystem).
+.TP
+.B MS_NOSYMFOLLOW
+Do not follow symlinks when resolving paths.  Symlinks can still be created,
+and
+.BR readlink (1),
+.BR readlink (2),
+.BR realpath (1)
+and
+.BR realpath (3)
+all still work properly.
 .PP
 From Linux 2.4 onward, some of the above flags are
 settable on a per-mount basis,

man2/statfs.2

@@ -206,6 +206,10 @@ Writes are synched to the filesystem immediately (see the description of
 .B O_SYNC
 in
 .BR open (2)).
+.TP
+.B ST_NOSYMFOLLOW
+Symlinks are not followed when resolving paths; see
+.BR mount (2).
 .PP
 Nobody knows what
 .I f_fsid