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Fix btrfs resize: use online resize instead of unmount/remount

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btrfs supports live filesystem resize, so there is no need to
unmount a mounted btrfs partition before shrinking it. This also
avoids umount failures when the partition is busy (e.g. /home with
an active SSH session). ext4 still requires offline resize.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Brot der Bot
2026-04-27 16:26:27 +02:00
parent bfa5515d75
commit bf71540f66
1 changed files with 20 additions and 13 deletions
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system_setup/install.sh
+20 -13
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@@ -345,14 +345,14 @@ if [[ "$MODE" == "shrink" ]]; then
echo " After shrink : ${CURR_START} MiB – ${NEW_END} MiB (filesystem: ${NEW_FS_MIB} MiB)"
echo " New OEMDRV : ${OEMDRV_START} MiB – ${OEMDRV_END} MiB (${SHRINK_MIB} MiB)"
if [[ "$S_MNT" != "-" && -n "$S_MNT" ]]; then
info "Unmounting $S_DEV from $S_MNT..."
ORIG_MNT="$S_MNT"
umount "$S_DEV" || die "Cannot unmount $S_DEV. Close all open files and try again."
WAS_MOUNTED=1
fi
if [[ "$S_FS" == "ext4" ]]; then
# ext4 requires offline resize — unmount first
if [[ "$S_MNT" != "-" && -n "$S_MNT" ]]; then
info "Unmounting $S_DEV from $S_MNT..."
ORIG_MNT="$S_MNT"
umount "$S_DEV" || die "Cannot unmount $S_DEV. Close all open files and try again."
WAS_MOUNTED=1
fi
info "Running e2fsck on $S_DEV..."
e2fsck -f "$S_DEV" || die "e2fsck found errors on $S_DEV. Fix them before retrying."
@@ -360,13 +360,20 @@ if [[ "$MODE" == "shrink" ]]; then
resize2fs "$S_DEV" "${NEW_FS_MIB}M" || die "resize2fs failed."
elif [[ "$S_FS" == "btrfs" ]]; then
# btrfs supports online resize — use existing mount point if available,
# otherwise mount temporarily
info "Shrinking btrfs filesystem on $S_DEV to ${NEW_FS_MIB} MiB..."
TMP_MNT=$(mktemp -d /tmp/oemdrv_btrfs.XXXXXX)
mount "$S_DEV" "$TMP_MNT" || { rmdir "$TMP_MNT"; die "Cannot mount $S_DEV for btrfs resize."; }
btrfs filesystem resize "${NEW_FS_MIB}m" "$TMP_MNT" \
|| { umount "$TMP_MNT"; rmdir "$TMP_MNT"; die "btrfs filesystem resize failed."; }
sync
umount "$TMP_MNT" && rmdir "$TMP_MNT"
if [[ "$S_MNT" != "-" && -n "$S_MNT" ]]; then
btrfs filesystem resize "${NEW_FS_MIB}m" "$S_MNT" \
|| die "btrfs filesystem resize failed."
else
TMP_MNT=$(mktemp -d /tmp/oemdrv_btrfs.XXXXXX)
mount "$S_DEV" "$TMP_MNT" || { rmdir "$TMP_MNT"; die "Cannot mount $S_DEV for btrfs resize."; }
btrfs filesystem resize "${NEW_FS_MIB}m" "$TMP_MNT" \
|| { umount "$TMP_MNT"; rmdir "$TMP_MNT"; die "btrfs filesystem resize failed."; }
sync
umount "$TMP_MNT" && rmdir "$TMP_MNT"
fi
fi
info "Shrinking partition $S_PNUM to ${NEW_END} MiB in partition table..."