FI_DROP_CACHE    2676 fs/f2fs/f2fs.h 	return is_inode_flag_set(inode, FI_DROP_CACHE);
FI_DROP_CACHE    1642 fs/f2fs/file.c 		set_inode_flag(inode, FI_DROP_CACHE);
FI_DROP_CACHE    1644 fs/f2fs/file.c 		clear_inode_flag(inode, FI_DROP_CACHE);