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nixos/swap: use btrfs mkswapfile if possible

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qbisi
2025-09-29 19:03:56 +08:00
parent 7ceeb354e6
commit b9fd04eb4d
1 changed files with 14 additions and 6 deletions
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nixos/modules/config/swap.nix
+14 -6
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@@ -268,6 +268,7 @@ in
sw:
let
realDevice' = utils.escapeSystemdPath sw.realDevice;
btrfsInSystem = config.boot.supportedFilesystems.btrfs or false;
in
lib.nameValuePair "mkswap-${sw.deviceName}" {
description = "Initialisation of swap device ${sw.device}";
@@ -287,6 +288,7 @@ in
pkgs.util-linux
pkgs.e2fsprogs
]
++ lib.optional btrfsInSystem pkgs.btrfs-progs
++ lib.optional sw.randomEncryption.enable pkgs.cryptsetup;
environment.DEVICE = sw.device;
@@ -295,13 +297,19 @@ in
${lib.optionalString (sw.size != null) ''
currentSize=$(( $(stat -c "%s" "$DEVICE" 2>/dev/null || echo 0) / 1024 / 1024 ))
if [[ ! -b "$DEVICE" && "${toString sw.size}" != "$currentSize" ]]; then
# Disable CoW for CoW based filesystems like BTRFS.
truncate --size 0 "$DEVICE"
chattr +C "$DEVICE" 2>/dev/null || true
if [[ $(stat -f -c %T $(dirname "$DEVICE")) == "btrfs" ]]; then
# Use btrfs mkswapfile to speed up the creation of swapfile.
rm -f "$DEVICE"
btrfs filesystem mkswapfile --size "${toString sw.size}M" --uuid clear "$DEVICE"
else
# Disable CoW for CoW based filesystems.
truncate --size 0 "$DEVICE"
chattr +C "$DEVICE" 2>/dev/null || true
echo "Creating swap file using dd and mkswap."
dd if=/dev/zero of="$DEVICE" bs=1M count=${toString sw.size} status=progress
${lib.optionalString (!sw.randomEncryption.enable) "mkswap ${sw.realDevice}"}
echo "Creating swap file using dd and mkswap."
dd if=/dev/zero of="$DEVICE" bs=1M count=${toString sw.size} status=progress
${lib.optionalString (!sw.randomEncryption.enable) "mkswap ${sw.realDevice}"}
fi
fi
''}
${lib.optionalString sw.randomEncryption.enable ''