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10 lines
851 B
Text
10 lines
851 B
Text
# rule to disable write cache for usb storage
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# requires hdparm to be installed
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ACTION=="add|change", KERNEL=="sd[a-z]", ENV{ID_USB_TYPE}=="disk", RUN+="[[ $(uname -r | awk -F'.' '{print $1 $2}') < 62 ]] && [[ $(which hdparm) =~ (hdparm) ]] && /usr/bin/hdparm -W 0 /dev/%K"
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#
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# rules to impose buffer limits on USB devices
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# requires kernel > 6.1
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# https://docs.kernel.org/admin-guide/abi-testing.html#abi-sys-class-bdi-bdi-strict-limit
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# https://docs.kernel.org/admin-guide/abi-testing.html#abi-sys-class-bdi-bdi-max-ratio
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# https://docs.kernel.org/admin-guide/abi-testing.html#abi-sys-class-bdi-bdi-max-bytes
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ACTION=="add|change", KERNEL=="sd[a-z]", ENV{ID_USB_TYPE}=="disk", RUN+="/usr/bin/echo 1 > /sys/block/%k/bdi/strict_limit", RUN+="/usr/bin/echo 50 > /sys/block/%k/bdi/max_ratio", RUN+="/usr/bin/echo 16777216 > /sys/block/%k/bdi/max_bytes"
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