From: Olga Kornievskaia <kolga@xxxxxxxxxx>
VFS copy_file_range was relaxed to allow for cross-device copy.
Add a check for now, to disallow cross-device copy offload until
appropriate support is added.
Signed-off-by: Olga Kornievskaia <kolga@xxxxxxxxxx>
`
---
fs/overlayfs/file.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/overlayfs/file.c b/fs/overlayfs/file.c
index aeaefd2..5282853 100644
--- a/fs/overlayfs/file.c
+++ b/fs/overlayfs/file.c
@@ -483,6 +483,9 @@ static ssize_t ovl_copy_file_range(struct file *file_in, loff_t pos_in,
struct file *file_out, loff_t pos_out,
size_t len, unsigned int flags)
{
+ if (file_in->f_inode->i_sb != file_out->f_inode->i_sb)
+ return -EXDEV;
+
return ovl_copyfile(file_in, pos_in, file_out, pos_out, len, flags,
OVL_COPY);
}
--
1.8.3.1
