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growpart: Add support for overprovisioning
Add option to 'growpart' to specify percentage of device that should be
left unallocated when growing partition. This is intended for consumer
SSDs and SD cards where the performance and/or lifetime of these devices
can be improved if some disk space (in addition to any the device "hides"
from users) is left unallocated.
Overprovisioning code caters for several distinct scenarios:
(1) MSDOS/MBR partitioned disk where the disk is >2TB and so MBR
partitions cannot extend beyond 2TB - if disk is larger than
(2TB + overprovisioning requirement) then nothing needs to be
done.
(2) MSDOS/MBR partitioned disk where the disk is >2TB and so MBR
partitions cannot extend beyond 2TB - if disk is not larger
than (2TB + overprovisioning requirement) then *some*
overprovisioning space still needs to be reserved.
(3) MSDOS/MBR partitioned disk <=2TB where overprovisioning space
needs to be reserved.
(4) GPT partitioned disk where overprovisioning space needs to be
reserved.
Also added a testcase script, test-growpart-overprovision.- Loading branch information
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,112 @@ | ||
| #!/bin/bash | ||
| # NEED_ROOT | ||
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| set -e | ||
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| [ "$(id -u)" = "0" ] || | ||
| { echo "sorry, must be root"; exit 1; } | ||
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| PT_TYPE="${PT_TYPE:-dos}" # dos or gpt | ||
| size=${DISK_SIZE_NEW:-100M} | ||
| osize=${DISK_SIZE_ORIG:-50M} | ||
| freepercent=${OVER_PROVISION_PERCENT:-10} | ||
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| LODEV="" | ||
| TEMP_D="" | ||
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| clearparts() { | ||
| # read /proc/partitions, clearing any partitions on dev (/dev/loopX) | ||
| local dev="$1" | ||
| local short=${dev##*/} parts="" part="" | ||
| parts=$(awk '$4 ~ m { sub(m,"",$4); print $4 }' \ | ||
| "m=${short}p" /proc/partitions) | ||
| [ -z "$parts" ] && return | ||
| echo "clearing parts [$parts] from $dev" | ||
| for part in $parts; do | ||
| echo "delpart $LODEV $part" | ||
| delpart $LODEV $part | ||
| done | ||
| udevadm settle | ||
| } | ||
| cleanup() { | ||
| if [ -n "$LODEV" ]; then | ||
| clearparts "$LODEV" | ||
| echo "losetup --detach $LODEV"; | ||
| losetup --detach "$LODEV"; | ||
| udevadm settle | ||
| fi | ||
| [ ! -d "${TEMP_D}" ] || rm -Rf "${TEMP_D}" | ||
| } | ||
| rq() { | ||
| local out="${TEMP_D}/out" | ||
| "$@" > "$out" 2>&1 || { echo "FAILED:" "$@"; cat "$out"; return 1; } | ||
| } | ||
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| TEMP_D=$(mktemp -d ${TMPDIR:-/tmp}/${0##*/}.XXXXXX) | ||
| trap cleanup EXIT | ||
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| img="${TEMP_D}/disk.img" | ||
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| echo "Partitioning $PT_TYPE orig_size=$osize grow_size=$size, overprovisioning=$freepercent%." | ||
| echo "growpart is $(which growpart)" | ||
| rm -f $img | ||
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| truncate --size $osize "$img" | ||
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| label_flag="--label=${PT_TYPE}" | ||
| echo "2048," | rq sfdisk $label_flag --force --unit=S "$img" | ||
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| truncate --size "$size" "$img" | ||
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| lodev=$(losetup --show --find "$img") | ||
| LODEV=$lodev | ||
| echo "set up $lodev" | ||
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| # clear any old ones that might be around (LP: #1136781) | ||
| clearparts "$lodev" | ||
| partx --add $lodev | ||
| lodevpart="${lodev}p1" | ||
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| echo "==== before ====" | ||
| grep "${lodev##*/}" /proc/partitions | ||
| sfdisk --list --unit=S "$lodev" | ||
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| errfile="${TEMP_D}/growpart.err" | ||
| growpart -v -v --free-percent "$freepercent" "$lodev" 1 2>"$errfile" || { | ||
| rc=$? | ||
| echo "failed [$rc]: growpart -v -v --free-percent $freepercent $lodev 1" | ||
| cat "$errfile" 1>&2 | ||
| exit $rc | ||
| } | ||
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| out=$(grep "FLOCK:.*releasing exclusive lock" "$errfile") || : | ||
| if [ -z "$out" ]; then | ||
| echo "ERROR: growpart stderr did not mention releasing lock" | ||
| exit 1 | ||
| fi | ||
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| echo === growpart stderr === | ||
| cat "$errfile" | ||
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| echo "==== after ====" | ||
| grep "${lodev##*/}" /proc/partitions | ||
| sfdisk --list --unit=S "$lodev" | ||
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| enddevice=$(grep "${lodev##*/}" /proc/partitions|grep -v "${lodevpart##*/}"|awk '{print $3}') | ||
| endpart=$(grep "${lodevpart##*/}" /proc/partitions|awk '{print $3}') | ||
| # Subtract the following from disk image end: | ||
| # - required percentage of overprovisioning | ||
| # - 1024 MiB (the partition start, 2048 sectors of 512 bytes) | ||
| # - 17 MiB (rounded up value of MBR padding of 33 sectors for GPT conversion) | ||
| # to calculate the expected end of resized partition. | ||
| expectedendpart=$((enddevice-(enddevice/100*freepercent)-1024-17)) | ||
| echo | ||
| if [ $endpart = $expectedendpart ]; then | ||
| echo "Final partition size matches expected partition size" | ||
| echo | ||
| else | ||
| echo "ERROR: final partition size of $endpart is different than expected size of $expectedendpart" | ||
| exit 1 | ||
| fi | ||
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| # vi: ts=4 noexpandtab |
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