##/bin/bash # SPDX-License-Identifier: GPL-2.0+ # Copyright (c) 2017 Oracle. All Rights Reserved. # # Routines for messing around with loadable kernel modules # Return the module name for this fs. _module_for_fs() { echo "${FSTYP}" } # Reload a particular module. This module MUST NOT be the module that # underlies the filesystem. _reload_module() { local module="$1" modprobe -r "${module}" || _fail "${module} unload failed" modprobe "${module}" || _fail "${module} load failed" } # Reload the filesystem module. _reload_fs_module() { local module="$1" # Unload test fs, try to reload module, remount local had_testfs="" local had_scratchfs="" _check_mounted_on TEST_DEV $TEST_DEV TEST_DIR $TEST_DIR && had_testfs="true" _check_mounted_on SCRATCH_DEV $SCRATCH_DEV SCRATCH_MNT $SCRATCH_MNT && had_scratchfs="true" test -n "${had_testfs}" && _test_unmount test -n "${had_scratchfs}" && _scratch_unmount _reload_module "${module}" test -n "${had_scratchfs}" && _scratch_mount 2> /dev/null test -n "${had_testfs}" && _test_mount 2> /dev/null } # Check that we have a module that can be loaded. This module MUST NOT # be the module that underlies the filesystem. _require_loadable_module() { local module="$1" modinfo "${module}" > /dev/null 2>&1 || _notrun "${module}: must be a module." modprobe -r "${module}" || _notrun "Require ${module} to be unloadable" modprobe "${module}" || _notrun "${module} load failed" } # Check that the module for FSTYP can be loaded. _require_loadable_fs_module() { local module="$1" modinfo "${module}" > /dev/null 2>&1 || _notrun "${module}: must be a module." # Unload test fs, try to reload module, remount local had_testfs="" local had_scratchfs="" _check_mounted_on TEST_DEV $TEST_DEV TEST_DIR $TEST_DIR && had_testfs="true" _check_mounted_on SCRATCH_DEV $SCRATCH_DEV SCRATCH_MNT $SCRATCH_MNT && had_scratchfs="true" test -n "${had_testfs}" && _test_unmount test -n "${had_scratchfs}" && _scratch_unmount local unload_ok="" local load_ok="" modprobe -r "${module}" || unload_ok=0 modprobe "${module}" || load_ok=0 test -n "${had_scratchfs}" && _scratch_mount 2> /dev/null test -n "${had_testfs}" && _test_mount 2> /dev/null test -z "${unload_ok}" || _notrun "Require module ${module} to be unloadable" test -z "${load_ok}" || _notrun "${module} load failed" } # Print the value of a filesystem module parameter # at /sys/module/$FSTYP/parameters/$PARAM # # Usage example (FSTYP=overlay): # _get_fs_module_param index _get_fs_module_param() { cat /sys/module/${FSTYP}/parameters/${1} 2>/dev/null }