Add the setlease file_operation to ext4_file_operations and
ext4_dir_operations, pointing to generic_setlease.  A future patch will
change the default behavior to reject lease attempts with -EINVAL when
there is no setlease file operation defined. Add generic_setlease to
retain the ability to set leases on this filesystem.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 fs/ext4/dir.c  | 2 ++
 fs/ext4/file.c | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
index 256fe2c1d4c1619eb2cd915d8b6b05bce72656e7..00c4b3c82b6534790962dc3964c0c557162b6dff 100644
--- a/fs/ext4/dir.c
+++ b/fs/ext4/dir.c
@@ -24,6 +24,7 @@
 
 #include <linux/fs.h>
 #include <linux/buffer_head.h>
+#include <linux/filelock.h>
 #include <linux/slab.h>
 #include <linux/iversion.h>
 #include <linux/unicode.h>
@@ -690,4 +691,5 @@ const struct file_operations ext4_dir_operations = {
 #endif
 	.fsync		= ext4_sync_file,
 	.release	= ext4_release_dir,
+	.setlease	= generic_setlease,
 };
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 7a8b3093218921f26a7f8962f94739ba49431230..534cf864101f8d1e5f4106b61c0580c858bc0e27 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -25,6 +25,7 @@
 #include <linux/mount.h>
 #include <linux/path.h>
 #include <linux/dax.h>
+#include <linux/filelock.h>
 #include <linux/quotaops.h>
 #include <linux/pagevec.h>
 #include <linux/uio.h>
@@ -980,6 +981,7 @@ const struct file_operations ext4_file_operations = {
 	.fop_flags	= FOP_MMAP_SYNC | FOP_BUFFER_RASYNC |
 			  FOP_DIO_PARALLEL_WRITE |
 			  FOP_DONTCACHE,
+	.setlease	= generic_setlease,
 };
 
 const struct inode_operations ext4_file_inode_operations = {

-- 
2.52.0