trim/init/trim.conf

# Copyright 2015 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

description     "Schedule SSD trim"
author          "chromium-os-dev@chromium.org"

start on started system-services
stop on stopping system-services

pre-start script
  . /usr/share/cros/disk_utils.sh
  . /usr/share/cros/trim_utils.sh

  mkdir -p "${CHROMEOS_TRIM_DIR}"
  ts="$(cat "${CHROMEOS_TRIM_STATE}" 2> /dev/null || : )"
  case "${ts}" in
    "${TRIM_NOT_SUPPORTED}")
      stop
      ;;
    "${TRIM_SUPPORTED}" | \
    "${TRIM_COMPLETED}" | \
    "${TRIM_FAILED}" | \
    "${TRIM_IN_PROGRESS}" )
      ;;
    *)
      ts="${TRIM_SUPPORTED}"
      # Use a length larger than the discard granularity.
      if ! fstrim --length 16K "${STATEFUL}" 2>/dev/null; then
        ts="${TRIM_NOT_SUPPORTED}"
      fi
      echo "${ts}" > "${CHROMEOS_TRIM_STATE}"
      if [ "${ts}" = "${TRIM_NOT_SUPPORTED}" ]; then
        stop
      fi
      ;;
  esac
end script

exec periodic_scheduler --period=21600 --timeout=3600 --task_name=trim \
    -- chromeos-trim