Run "check" about specified md device if it's status is "idle"

md_sync_call.sh

#!/bin/sh

TARGET_MD=$1

### call md verifying when idle.
######
# HOW TO USE
### md_sync_call.sh md0

error_exit() {
    echo $*
    exit 1
}

is_root_user() {
    UNAME=`whoami`
    if [ $UNAME != "root" ]; then
        error_exit "md_sync_call.sh: requested operation requires superuser privilege"
    fi
    return 0
}

md_exists() {
    if [ -d /sys/block/$TARGET_MD ]; then
        return 0
    fi
    error_exit "md_sync_call.sh: no such md:" $TARGET_MD
}


in_idle() {
    MD_STATE=`cat /sys/block/$TARGET_MD/md/sync_action`
    if [ $MD_STATE != "idle" ]; then
        error_exit "md_sync_call.sh: target md" $TARGET_MD "is not in idle:" $MD_STATE
    fi
    return 0
}

call_check() {
    echo "check" > /sys/block/$TARGET_MD/md/sync_action
    return 0
}

is_root_user
md_exists
in_idle
call_check

exit 0