io: Remove copy_file_range emulation [BZ #24744]

The kernel is evolving this interface (e.g., removal of the
restriction on cross-device copies), and keeping up with that
is difficult.  Applications which need the function should
run kernels which support the system call instead of relying on
the imperfect glibc emulation.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>

1 files changed, 12 insertions, 4 deletions

diff --git a/io/copy_file_range.c b/io/copy_file_range.c
index 7b968be19d..59fb979773 100644
--- a/io/copy_file_range.c
+++ b/io/copy_file_range.c
@@ -1,4 +1,4 @@
-/* Generic implementation of copy_file_range.
+/* Stub implementation of copy_file_range.
    Copyright (C) 2017-2019 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
@@ -16,7 +16,15 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#define COPY_FILE_RANGE_DECL
-#define COPY_FILE_RANGE copy_file_range
+#include <errno.h>
+#include <unistd.h>
 
-#include <io/copy_file_range-compat.c>
+ssize_t
+copy_file_range (int infd, __off64_t *pinoff,
+                 int outfd, __off64_t *poutoff,
+                 size_t length, unsigned int flags)
+{
+  __set_errno (ENOSYS);
+  return -1;
+}
+stub_warning (copy_file_range)