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@ -27,6 +27,13 @@ if [ ! -f "$file" ]; then
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exit 1
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fi
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if echo $size | grep -q "^-"; then
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mode="Shrink"
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size=${size:1}
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else
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mode="Extend"
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fi
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if echo $size | grep -q "[^0-9]"; then
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print_usage
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exit 1
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@ -42,10 +49,25 @@ fi
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fsMB=$(expr $fsize / 1024 / 1024)
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total=$(expr $fsMB + $size)
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if [ "$mode" = "Extend" ]; then
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total=$(expr $fsMB + $size)
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else
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if [ $fsMB -le $size ]; then
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echo "File size of $file is less than ${size}MB."
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exit 1
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fi
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total=$(expr $fsMB - $size)
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fi
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magic=$(hexdump -n3 -e '3/1 "%02X"' $file)
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if [ "$magic" = "584653" ]; then
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if [ "$mode" = "Shrink" ]; then
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echo "Shrink is not supported for XFS filesystem."
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exit 1
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fi
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if which xfs_growfs >/dev/null 2>&1; then
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cmd=xfs_growfs
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else
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@ -61,23 +83,26 @@ else
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fi
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fi
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if [ "$mode" = "Extend" ]; then
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echo "$mode dat file... (current is ${fsMB}MB, append ${size}MB, total ${total}MB)"
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dd if=/dev/zero bs=1M count=$size status=none >> "$file"
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sync
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else
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echo "$mode dat file... (current is ${fsMB}MB, reduce ${size}MB, finally ${total}MB)"
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fi
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echo "Extend dat file... (current is ${fsMB}MB, append ${size}MB, total ${total}MB)"
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dd if=/dev/zero bs=1M count=$size status=none >> "$file"
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sync
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freeloop=$(losetup -f)
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losetup $freeloop "$file"
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if [ "$cmd" = "resize2fs" ]; then
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echo "Extend ext filesystem by resize2fs ..."
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echo "$mode ext filesystem by resize2fs ..."
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echo "resize2fs $freeloop ${total}M"
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e2fsck -f $freeloop
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resize2fs $freeloop ${total}M
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ret=$?
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else
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echo "Extend xfs filesystem by xfs_growfs ..."
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echo "$mode xfs filesystem by xfs_growfs ..."
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tmpdir=$(mktemp -d)
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mount $freeloop $tmpdir
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xfs_growfs $freeloop
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@ -87,6 +112,12 @@ fi
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losetup -d $freeloop
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if [ $ret -eq 0 -a "$mode" = "Shrink" ]; then
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echo "truncate persistent file ..."
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truncate "$file" -s ${total}M
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ret=$?
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fi
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echo ""
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if [ $ret -eq 0 ]; then
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echo "======= SUCCESS ========="
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@ -94,4 +125,3 @@ else
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echo "======= FAILED ========="
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fi
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echo ""
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