[PATCH] f2fs: fix to avoid move_range and defragment on device_alias file

[Chao Yu <chao@kernel.org>]

It's forbidden to migrate blocks of device alias file.

Cc: stable@kernel.org
Fixes: 128d333f0dff ("f2fs: introduce device aliasing file")
Signed-off-by: Chao Yu <chao@kernel.org>
---
 fs/f2fs/file.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 4b52c56d71f0..f4facd409d9b 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -3083,6 +3083,9 @@ static int f2fs_ioc_defragment(struct file *filp, unsigned long arg)
 	if (f2fs_readonly(sbi->sb))
 		return -EROFS;
 
+	if (IS_DEVICE_ALIASING(inode))
+		return -EOPNOTSUPP;
+
 	if (copy_from_user(&range, (struct f2fs_defragment __user *)arg,
 							sizeof(range)))
 		return -EFAULT;
@@ -3135,7 +3138,8 @@ static int f2fs_move_file_range(struct file *file_in, loff_t pos_in,
 	if (!S_ISREG(src->i_mode) || !S_ISREG(dst->i_mode))
 		return -EINVAL;
 
-	if (IS_ENCRYPTED(src) || IS_ENCRYPTED(dst))
+	if (IS_ENCRYPTED(src) || IS_ENCRYPTED(dst) ||
+		IS_DEVICE_ALIASING(src) || IS_DEVICE_ALIASING(dst))
 		return -EOPNOTSUPP;
 
 	if (pos_out < 0 || pos_in < 0)
-- 
2.49.0