erofs: add setlease file operation

Add the setlease file_operation to erofs_file_fops and erofs_dir_fops,
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>
Link: https://patch.msgid.link/20260108-setlease-6-20-v1-4-ea4dec9b67fa@kernel.org
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>

fs/erofs/data.c

@@ -5,6 +5,7 @@
  * Copyright (C) 2021, Alibaba Cloud
  */
 #include "internal.h"
+#include <linux/filelock.h>
 #include <linux/sched/mm.h>
 #include <trace/events/erofs.h>
 
@@ -483,4 +484,5 @@ const struct file_operations erofs_file_fops = {
 	.mmap_prepare	= erofs_file_mmap_prepare,
 	.get_unmapped_area = thp_get_unmapped_area,
 	.splice_read	= filemap_splice_read,
+	.setlease	= generic_setlease,
 };

fs/erofs/dir.c

@@ -5,6 +5,7 @@
  * Copyright (C) 2022, Alibaba Cloud
  */
 #include "internal.h"
+#include <linux/filelock.h>
 
 static int erofs_fill_dentries(struct inode *dir, struct dir_context *ctx,
 			       void *dentry_blk, struct erofs_dirent *de,
@@ -127,4 +128,5 @@ const struct file_operations erofs_dir_fops = {
 #ifdef CONFIG_COMPAT
 	.compat_ioctl   = erofs_compat_ioctl,
 #endif
+	.setlease	= generic_setlease,
 };