Add the setlease file_operation to fat_file_operations and
fat_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/fat/dir.c  | 2 ++
 fs/fat/file.c | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/fs/fat/dir.c b/fs/fat/dir.c
index 92b091783966af6a9e6f5ead1a382a98dd92bba0..807bc8b1bc145a9f15765920670c6233f7e87e55 100644
--- a/fs/fat/dir.c
+++ b/fs/fat/dir.c
@@ -16,6 +16,7 @@
 
 #include <linux/slab.h>
 #include <linux/compat.h>
+#include <linux/filelock.h>
 #include <linux/uaccess.h>
 #include <linux/iversion.h>
 #include "fat.h"
@@ -876,6 +877,7 @@ const struct file_operations fat_dir_operations = {
 	.compat_ioctl	= fat_compat_dir_ioctl,
 #endif
 	.fsync		= fat_file_fsync,
+	.setlease	= generic_setlease,
 };
 
 static int fat_get_short_entry(struct inode *dir, loff_t *pos,
diff --git a/fs/fat/file.c b/fs/fat/file.c
index 4fc49a614fb8fd64e219db60c6d9e7dd100aea1c..d50a6d8bfaae0c75b2dbe838d108135206d0f123 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -13,6 +13,7 @@
 #include <linux/mount.h>
 #include <linux/blkdev.h>
 #include <linux/backing-dev.h>
+#include <linux/filelock.h>
 #include <linux/fsnotify.h>
 #include <linux/security.h>
 #include <linux/falloc.h>
@@ -212,6 +213,7 @@ const struct file_operations fat_file_operations = {
 	.splice_read	= filemap_splice_read,
 	.splice_write	= iter_file_splice_write,
 	.fallocate	= fat_fallocate,
+	.setlease	= generic_setlease,
 };
 
 static int fat_cont_expand(struct inode *inode, loff_t size)

-- 
2.52.0