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https://codeberg.org/wonky/udev-usb-sync.git
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Added kernel minor to the factor
Only kernels above 6.1 supports strict_limit and max_bytes
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parent
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commit
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2 changed files with 9 additions and 7 deletions
4
PKGBUILD
4
PKGBUILD
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@ -1,7 +1,7 @@
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# Maintainer: root.nix.dk
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pkgname='udev-usb-sync'
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pkgver=0.9
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pkgrel=3
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pkgver=0.10
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pkgrel=1
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pkgdesc='Fine tune write cache and impose buffer limits when USB storage device is plugged'
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arch=('any')
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url='https://codeberg.org/wonky/udev-usb-sync'
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@ -42,21 +42,23 @@ CONFIG='/etc/udev-usb-sync/udev-usb-sync.conf'
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BLOCKDEVICE="$1"
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SPEED="$2"
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KERNEL_MAJOR_VERSION=$(uname -r | awk -F'.' '{print $1}')
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KERNEL_MINOR_VERSION=$(uname -r | awk -F'.' '{print $2}')
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# disable write cache for device if possible
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[[ -n $(which hdparm) ]] && $(which hdparm) -W 0 /dev/$BLOCKDEVICE
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[[ -n $(which hdparm) ]] && $(which hdparm) -W 0 /dev/$BLOCKDEVICE > /dev/null
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if [[ $KERNEL_MAJOR_VERSION -le 5 ]]; then
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if [[ $KERNEL_MAJOR_VERSION -le 6 ]]; then
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# the following rules is introduced with kernel 2.6
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# https://docs.kernel.org/admin-guide/abi-testing.html#abi-sys-class-bdi-bdi-max-ratio
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# 1% of available RAM -> 8046522kB -> 80.465kB -> 80MB
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echo 1 > /sys/block/$BLOCKDEVICE/bdi/max_ratio
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elif [[ $KERNEL_MAJOR_VERSION -ge 6 ]]; then
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# the following rules is introduced with kernel 6.1
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elif [[ $KERNEL_MAJOR_VERSION -ge 6 ]] && [[ $KERNEL_MINOR_VERSION -ge 2 ]]; then
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# the following rules is introduced with kernel 6.2
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# https://docs.kernel.org/admin-guide/abi-testing.html#abi-sys-class-bdi-bdi-strict-limit
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# https://docs.kernel.org/admin-guide/abi-testing.html#abi-sys-class-bdi-bdi-max-bytes
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# Turning strictlimit on has no visible effect if max_ratio is equal to 100%.
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echo 50 > /sys/block/$BLOCKDEVICE/bdi/max_ratio
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# apply strict limit
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echo 1 > /sys/block/$BLOCKDEVICE/bdi/strict_limit
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