93 lines
3.0 KiB
Bash
Executable File
93 lines
3.0 KiB
Bash
Executable File
#!/system/bin/sh
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# USB 读卡器守护脚本 v5 - 仅针对 GL3224 读卡器 (VID:PID 05e3:0747)
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# 功能: ①应用稳定性调优 ②掉线自动恢复(3场景)
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# 安全: 仅当 USB 端口 2-1 上的设备 VID/PID 匹配时才干预, 其他设备完全不受影响
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DEV_PATH="2-1"
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TARGET_VID="05e3"
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TARGET_PID="0747"
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LOGFILE="/data/local/tmp/usb_guard.log"
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AUTHORIZED="/sys/bus/usb/devices/${DEV_PATH}/authorized"
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BLKDEV=""
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LAST_HEALTH=0
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TUNED=0
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log() { echo "[$(date '+%F %T')] $1" >> "$LOGFILE"; }
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# 校验当前 2-1 口上的设备是否为目标读卡器
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is_target() {
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[ "$(cat /sys/bus/usb/devices/${DEV_PATH}/idVendor 2>/dev/null)" = "$TARGET_VID" ] && \
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[ "$(cat /sys/bus/usb/devices/${DEV_PATH}/idProduct 2>/dev/null)" = "$TARGET_PID" ]
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}
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# 动态解析该 USB 设备对应的块设备名 (如 sdg), 避免硬编码
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find_blkdev() {
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for b in /sys/class/block/sd[a-z]; do
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target=$(readlink -f "$b" 2>/dev/null)
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case "$target" in
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*"${DEV_PATH}:1.0"*) echo "${b##*/}"; return 0 ;;
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esac
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done
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return 1
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}
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apply_tuning() {
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[ -n "$BLKDEV" ] && [ -e "/sys/block/$BLKDEV" ] || return
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echo 120 > /sys/block/$BLKDEV/device/timeout 2>/dev/null
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echo 256 > /sys/block/$BLKDEV/queue/max_sectors_kb 2>/dev/null
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echo none > /sys/block/$BLKDEV/queue/scheduler 2>/dev/null
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TUNED=1
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log "已应用调优参数 ($BLKDEV: timeout=120s, max_sectors=256KB, scheduler=none)"
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}
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recover() {
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log "$1 -> 执行重枚举..."
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echo 0 > "$AUTHORIZED" 2>/dev/null
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sleep 3
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echo 1 > "$AUTHORIZED" 2>/dev/null
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sleep 7
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if [ -f "$AUTHORIZED" ] && [ "$(cat "$AUTHORIZED" 2>/dev/null)" = "1" ]; then
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log "重枚举成功，设备恢复"
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TUNED=0
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BLKDEV=""
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else
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log "重枚举失败，请手动检查"
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fi
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dmesg -c > /dev/null 2>&1
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}
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log "守护脚本启动 v5 (目标: GL3224 05e3:0747)"
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while true; do
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if [ -f "$AUTHORIZED" ] && is_target; then
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# 解析块设备名
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[ -z "$BLKDEV" ] && BLKDEV=$(find_blkdev)
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# 场景B: 异常断开
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if [ "$(cat "$AUTHORIZED" 2>/dev/null)" = "0" ]; then
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recover "场景B: 设备异常断开"
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continue
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fi
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# 健康时确保调优参数
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if [ "$TUNED" = "0" ] && [ -n "$BLKDEV" ]; then
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apply_tuning
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fi
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# 场景A: SCSI offline 日志
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if dmesg 2>/dev/null | tail -30 | grep -q "device offline or changed"; then
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recover "场景A: 检测到设备假死"
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continue
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fi
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# 场景C: 健康探测 (每12秒, 读扇区0, 5秒超时)
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now=$(date +%s)
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if [ $((now - LAST_HEALTH)) -ge 12 ] && [ -n "$BLKDEV" ]; then
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LAST_HEALTH=$now
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if ! timeout 5 dd if="/dev/block/$BLKDEV" bs=512 count=1 of=/dev/null 2>/dev/null; then
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recover "场景C: 健康探测超时(静默假死)"
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continue
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fi
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fi
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else
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# 非目标设备: 完全旁观, 不做任何操作
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sleep 10
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fi
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sleep 2
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done
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