[RFE] Add GetUsed/AvailableSpace properties to the o.f.Udisks2.Filesystem

[aruiz]

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It is not possible to know the available or used space using UDisks2 having to fallback to parsing "df", Getter methods for Used and/or Available space would be handy.

[pothos]

You can have a look at statvfs here: https://gitlab.gnome.org/GNOME/gnome-disk-utility/blob/master/src/libgdu/gduutils.c#L1713

[aruiz]

statvfs works if the filesystem is mounted, but not for an unmounted fs

[vpodzime]

statvfs works if the filesystem is mounted, but not for an unmounted fs

The same applies to df, right?

[aruiz]

Sure, but as an example, GParted shows filesystem usage information even for unmounted partitions. This is handy for partition resizing (which is done on unmounted filesystems).

[vojtechtrefny]

We already have the functionality to get free blocks in libblockdev (for ext, vfat and ntfs) so it should be quite easy to implement this in udisks.

[tbzatek]

There's a org.freedesktop.UDisks2.Filesystem.Size property that indicates actual size of the filesystem (incl. metadata, journal, etc.) on a block device, that can happen to be larger (think of a filesystem grow scenario).

However the Size property turned out to be a nightmare to keep updated as it generated too much I/O. We've worked hard to make the property value retrieval on demand, placing hack on top of other hacks to avoid breaking the public API.

So in case something like df is ever set to be added to UDisks, it will be a method call. I'm still not convinced we want it at all.