f2fs: add compat_ioctl to provide backward compatability

introduce compat_ioctl to regular files, but doesn't add this
functionality to f2fs_dir_operations.

While running a 32-bit busybox, I met an error like this:
(A is a directory)

chattr: reading flags on A: Inappropriate ioctl for device

This patch copies compat_ioctl from f2fs_file_operations and
fix this problem.

Signed-off-by: hujianyang <hujianyang@huawei.com>
Reviewed-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index 12f686914d387f3fbc80e19537ea90b4e0bc6b0a..3e923763daca0c44af75600de599babaf6839bc2 100644 (file)
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -879,4 +879,7 @@ const struct file_operations f2fs_dir_operations = {
        .iterate        = f2fs_readdir,
        .fsync          = f2fs_sync_file,
        .unlocked_ioctl = f2fs_ioctl,
+#ifdef CONFIG_COMPAT
+       .compat_ioctl   = f2fs_compat_ioctl,
+#endif
 };