From: Olga Kornievskaia <kolga@xxxxxxxxxx>
If a filesystem does not support cross device or cross file system
type copy offload functionality, then this patch provides a fallback
to a page cache based physical data copy. This means the
copy_file_range() systemcall will never fail with EXDEV, and so in
future userspace will not need to detect or provide a fallback for
failed cross-device copies anymore.
Signed-off-by: Olga Kornievskaia <kolga@xxxxxxxxxx>
---
fs/read_write.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/read_write.c b/fs/read_write.c
index 7a912e3..cff59bd 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1597,7 +1597,7 @@ ssize_t vfs_copy_file_range(struct file *file_in, loff_t pos_in,
if (file_out->f_op->copy_file_range) {
ret = file_out->f_op->copy_file_range(file_in, pos_in, file_out,
pos_out, len, flags);
- if (ret != -EOPNOTSUPP)
+ if (ret != -EOPNOTSUPP && ret != -EXDEV)
goto done;
}
--
1.8.3.1
