Reject copies that don't have the COPY_FR_REFLINK flag set.
Signed-off-by: Anna Schumaker <anna.schuma...@netapp.com>
---
fs/btrfs/ioctl.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 4311554..2e14b91 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -44,6 +44,7 @@
#include <linux/uuid.h>
#include <linux/btrfs.h>
#include <linux/uaccess.h>
+#include <linux/copy.h>
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
@@ -3848,6 +3849,9 @@ ssize_t btrfs_copy_file_range(struct file *file_in,
loff_t pos_in,
{
ssize_t ret;
+ if (!(flags & COPY_FR_REFLINK))
+ return -EOPNOTSUPP;
+
ret = btrfs_clone_files(file_out, file_in, pos_in, len, pos_out);
if (ret == 0)
ret = len;
--
2.5.1
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