taglinefilesource code
S_IFBLK497fs/namei.ccase S_IFREG: case S_IFCHR: case S_IFBLK: case S_IFIFO: case S_IFSOCK:
S_IFBLK26include/linux/stat.h#define S_ISBLK(m)  (((m) & S_IFMT) == S_IFBLK)