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Improve resizing of LVM PVs.

This commit is contained in:
Andrius Štikonas 2016-08-06 22:15:50 +01:00
parent 8c58ffe60f
commit 81a35f0ffd
1 changed files with 9 additions and 6 deletions
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15
src/fs/lvm2_pv.cpp
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@ -96,7 +96,8 @@ qint64 lvm2_pv::maxCapacity() const
qint64 lvm2_pv::readUsedCapacity(const QString& deviceNode) const
{
QString val = getpvField(QStringLiteral("pv_used"), deviceNode);
return val.isEmpty() ? -1 : val.toLongLong();
QString metadataOffset = getpvField(QStringLiteral("pe_start"), deviceNode);
return val.isEmpty() ? -1 : val.toLongLong() + metadataOffset.toLongLong();
}
bool lvm2_pv::check(Report& report, const QString& deviceNode) const
@ -122,18 +123,20 @@ bool lvm2_pv::resize(Report& report, const QString& deviceNode, qint64 length) c
{
bool rval = true;
qint64 lastPE = getTotalPE(deviceNode) - 1;
qint64 metadataOffset = getpvField(QStringLiteral("pe_start"), deviceNode).toLongLong();
qint64 lastPE = getTotalPE(deviceNode) - 1; // starts from 0
if (lastPE > 0) { // make sure that the PV is already in a VG
qint64 targetPE = length / getPESize(deviceNode);
qint64 targetPE = (length - metadataOffset)/ getPESize(deviceNode) - 1; // starts from 0
if (targetPE < lastPE) { //shrinking FS
qint64 firstPE = targetPE - 1;
qint64 firstMovedPE = qMax(targetPE + 1, getAllocatedPE(deviceNode)); // starts from 1
ExternalCommand moveCmd(report,
QStringLiteral("lvm"), {
QStringLiteral("pvmove"),
QStringLiteral("--alloc"),
QStringLiteral("anywhere"),
deviceNode + QStringLiteral(":") + QString::number(firstPE) + QStringLiteral("-") + QString::number(lastPE),
deviceNode + QStringLiteral(":") + QStringLiteral("0-") + QString::number(firstPE - 1)
deviceNode + QStringLiteral(":") + QString::number(firstMovedPE) + QStringLiteral("-") + QString::number(lastPE),
deviceNode + QStringLiteral(":") + QStringLiteral("0-") + QString::number(firstMovedPE - 1)
});
rval = moveCmd.run(-1) && (moveCmd.exitCode() == 0 || moveCmd.exitCode() == 5); // FIXME: exit code 5: NO data to move
}