Add generic file and dir seek methods

Two more xfstests pass when we can seek in files and dirs.

Signed-off-by: Zach Brown <zab@versity.com>
Reviewed-by: Mark Fasheh <mfasheh@versity.com>

kmod/src/data.c

@@ -545,6 +545,7 @@ const struct file_operations scoutfs_file_fops = {
 	.aio_write	= generic_file_aio_write,
 	.unlocked_ioctl	= scoutfs_ioctl,
 	.fsync		= scoutfs_file_fsync,
+	.llseek		= generic_file_llseek,
 };
 
 int scoutfs_data_setup(struct super_block *sb)

kmod/src/dir.c

@@ -942,6 +942,7 @@ out:
 const struct file_operations scoutfs_dir_fops = {
 	.readdir	= scoutfs_readdir,
 	.fsync		= scoutfs_file_fsync,
+	.llseek		= generic_file_llseek,
 };
 
 const struct inode_operations scoutfs_dir_iops = {