stat: drop %C support when printing file system details

* src/stat.c (print_statfs, usage): Drop %C, since it applies to
files, not file systems.
(out_file_context): Match style of other out_* functions.
(print_stat): Update caller.
* doc/coreutils.texi (stat invocation): Document %C.
* NEWS: Document the change.

1 files changed, 6 insertions, 2 deletions

diff --git a/NEWS b/NEWS
index 719ac9c47..22f257ba6 100644
--- a/NEWS
+++ b/NEWS
@@ -76,10 +76,14 @@ GNU coreutils NEWS                                    -*- outline -*-
   stat no longer accepts the --context (-Z) option.  Initially it was
   merely accepted and ignored, for compatibility.  Starting two years
   ago, with coreutils-7.0, its use evoked a warning.  Printing the
-  SELinux context can be done with the %C format directive, and the
-  default output when no format is specified now automatically
+  SELinux context of a file can be done with the %C format directive,
+  and the default output when no format is specified now automatically
   includes %C when context information is available.
 
+  stat no longer accepts the %C directive when the --file-system
+  option is in effect, since security context is a file attribute
+  rather than a file system attribute.
+
   stat now outputs the full sub-second resolution for the atime,
   mtime, and ctime values since the Epoch, when using the %X, %Y, and
   %Z directives of the --format option.  This matches the fact that