cp: accept the --reflink option

* NEWS: Mention it.
* doc/coreutils.texi (cp invocation): Describe it.
* src/copy.h (struct cp_options) [reflink]: New member.
* src/copy.c (usage): Describe it.
(copy_reg): If reflink is true try to clone the file.
(main): Check for --reflink.
(cp_option_init): Initialize the new member.
* src/install.c (cp_option_init): Initialize the new member.
* src/mv.c (cp_option_init): Likewise.
* tests/cp/sparse: Add a new test case.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/mv.c b/src/mv.c
index 8b9b6a111..8d77380ac 100644
--- a/src/mv.c
+++ b/src/mv.c
@@ -105,6 +105,7 @@ cp_option_init (struct cp_options *x)
 
   cp_options_default (x);
   x->copy_as_regular = false;  /* FIXME: maybe make this an option */
+  x->reflink = false;
   x->dereference = DEREF_NEVER;
   x->unlink_dest_before_opening = false;
   x->unlink_dest_after_failed_open = false;