74 lines
2.2 KiB
Bash
74 lines
2.2 KiB
Bash
#!/bin/bash
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#
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# pvsqueeze - Squeeze linear extents into free holes
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#
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# This script iteratively moves linear (allocated to LV) extents to fill in
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# free holes found in a PV segment map. The end result is that all free
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# extents are at the end of the PV. Use this script in anger as required!
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#
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# The script outputs the PV segment map before moving anything, then iterates
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# stuffing extents in each free hole until there are no more except for the
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# last one, and finally outputs the PV segment map again showing the changes.
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#
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# Usage
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if [[ ! $1 =~ ^/dev/ ]]; then
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echo "Usage: $0 PV"
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exit 1
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fi
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# Set some vars
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pvdev=$1
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pvsargs='--noheadings --nameprefixes --segments -o pvseg_start,pvseg_size,segtype'
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# Show current segment map
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echo 'PV segment map before squeeze:'
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pvs "$pvdev" --segments -o lvname,pvseg_start,pvseg_size,seg_le_ranges
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if [[ $? -ne 0 ]]; then
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echo "$0: Fatal error getting PV info"
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exit 1
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fi
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# Iterate stuffing PEs in each free hole
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while true; do
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# Find first free segment
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LVM2_PVSEG_START=
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eval $(pvs "$pvdev" $pvsargs | grep SEGTYPE=.free. | head -1)
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if [[ -z $LVM2_PVSEG_START ]]; then
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echo "$0: No free segments found"
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exit 1
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fi
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free_start=$LVM2_PVSEG_START
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free_size=$LVM2_PVSEG_SIZE
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# Find the last linear segment
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LVM2_PVSEG_START=
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eval $(pvs "$pvdev" $pvsargs | grep SEGTYPE=.linear. | tail -1)
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if [[ -z $LVM2_PVSEG_START ]]; then
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echo "$0: No linear segments found"
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exit 1
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fi
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move_start=$LVM2_PVSEG_START
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move_size=$LVM2_PVSEG_SIZE
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# We're done when first free is after the last linear
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[[ $free_start -gt $move_start ]] && break
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# Move last linear PEs to the free segment
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[[ $free_size -gt $move_size ]] && free_size=$move_size
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from_range="$pvdev:$((move_start+move_size-free_size))-$((move_start+move_size-1))"
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to_range="$pvdev:$((free_start))-$((free_start+free_size))"
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echo "Moving $from_range to $to_range..."
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pvmove --atomic --alloc anywhere "$from_range" "$to_range"
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if [[ $? -ne 0 ]]; then
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echo "$0: Fatal error doing pvmove"
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exit 1
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fi
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done
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# Show squeezed segment map
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echo 'PV segment map after squeeze:'
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pvs "$pvdev" --segments -o lvname,pvseg_start,pvseg_size,seg_le_ranges
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exit 0
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