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Get btrfs used capacity from btrfs filesystem show --raw 

It's output looks like:

Label: 'test'  uuid: d23f3138-c8ea-449e-9155-015ce4f6e2e6
        Total devices 1 FS bytes used 131072
        devid    1 size 981467136 used 252706816 path /dev/sdb1

FS bytes used number is actual data on btrfs volume. However,
to resize successfully we need to know actual space used by data
and metadata. That's why we read size from devid (i.e. 252706816).

Btrfs volumes can span over multiple devices, so we must make sure
that we are reading devid corresponding to the correct device node.

BUG: 353333
This commit is contained in:
Andrius Štikonas 2016-02-18 13:39:09 +00:00
parent 58013d54fe
commit 20bb8eba7e
1 changed files with 2 additions and 2 deletions
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4
src/fs/btrfs.cpp
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@ -105,10 +105,10 @@ qint64 btrfs::maxLabelLength() const
qint64 btrfs::readUsedCapacity(const QString& deviceNode) const
{
ExternalCommand cmd(QStringLiteral("btrfs-debug-tree"), QStringList() << deviceNode);
ExternalCommand cmd(QStringLiteral("btrfs"), QStringList() << QStringLiteral("filesystem") << QStringLiteral("show") << QStringLiteral("--raw") << deviceNode);
if (cmd.run()) {
QRegExp rxBytesUsed(QStringLiteral(" bytes used (\\d+)"));
QRegExp rxBytesUsed(QStringLiteral(" used (\\d+) path ") + deviceNode);
if (rxBytesUsed.indexIn(cmd.output()) != -1)
return rxBytesUsed.cap(1).toLongLong();