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LowMem extension: Fix swapfile creation on btrfs; Fix permission race #10298

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LowMem extension: Fix swapfile creation on btrfs; Fix permission race #10298

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LowMem extension: Fix permission race when creating swapfile
dlitz Jul 27, 2026
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LowMem extension: Fix swapfile creation on btrfs
dlitz Jul 28, 2026
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13 changes: 12 additions & 1 deletion packages/bsp/armbian-lowmem/lowmem-mkswap.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -23,7 +23,18 @@ if (( FREE_MB < NEEDED_MB )); then
exit 1
fi

# Create swapfile, set permissions, and enable it
# Prevent permission race
umask 077

# Create empty swapfile
truncate -s0 "${SWAPFILE_PATH}"

# Set the "disable copy-on-write" attribute, since the kernel doesn't support
# copy-on-write swapfiles. Ignore error, which probably indicates that the
# fileystem doesn't support CoW (e.g. on ext4).
chattr -f +C "${SWAPFILE_PATH}" || true

# Allocate swap space, ensure correct permissions, and enable it
fallocate -l "${SWAPFILE_SIZE_MB}M" "${SWAPFILE_PATH}"
chmod 600 "${SWAPFILE_PATH}"
mkswap "${SWAPFILE_PATH}"
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