Only try clone_file_range if superblocks are the same.
Signed-off-by: Olga Kornievskaia <kolga@xxxxxxxxxx>
---
fs/read_write.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/read_write.c b/fs/read_write.c
index 75084cd..00161bd 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1543,7 +1543,8 @@ ssize_t vfs_copy_file_range(struct file *file_in, loff_t pos_in,
* Try cloning first, this is supported by more file systems, and
* more efficient if both clone and copy are supported (e.g. NFS).
*/
- if (file_in->f_op->clone_file_range) {
+ if (inode_in->i_sb == inode_out->i_sb &&
+ file_in->f_op->clone_file_range) {
ret = file_in->f_op->clone_file_range(file_in, pos_in,
file_out, pos_out, len);
if (ret == 0) {
--
1.8.3.1
