VFS - cancel_nblock()
VFS - cancel_nblock()

- duplicate code in dev_io() which sends CANCEL in case of a
  non-blocking operation moved to cancel_nblock()

veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi