xfs: add setlease file operation

Add the setlease file_operation pointing to generic_setlease to the xfs
file_operations structures. 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-v1-22-ea4dec9b67fa@kernel.org
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner <brauner@kernel.org>

Author: jtlayton

fs/xfs/xfs_file.c

@@ -36,6 +36,7 @@
 #include <linux/mman.h>
 #include <linux/fadvise.h>
 #include <linux/mount.h>
+#include <linux/filelock.h>
 
 static const struct vm_operations_struct xfs_file_vm_ops;
 
@@ -2007,6 +2008,7 @@ const struct file_operations xfs_file_operations = {
 	.fop_flags	= FOP_MMAP_SYNC | FOP_BUFFER_RASYNC |
 			  FOP_BUFFER_WASYNC | FOP_DIO_PARALLEL_WRITE |
 			  FOP_DONTCACHE,
+	.setlease	= generic_setlease,
 };
 
 const struct file_operations xfs_dir_file_operations = {
@@ -2019,4 +2021,5 @@ const struct file_operations xfs_dir_file_operations = {
 	.compat_ioctl	= xfs_file_compat_ioctl,
 #endif
 	.fsync		= xfs_dir_fsync,
+	.setlease	= generic_setlease,
 };