Mounted BTRFS subvolume/snapshot names

[bastimeyer]

 * Nemo version: 3.8.5
 * Is issue with desktop or windowed nemo? Windowed nemo
 * Distribution: Arch
 * Graphics hardware *and* driver used: irrelevant
 * 32 or 64 bit: 64 bit

Issue

• Nemo uses the same BTRFS partition label for all of its mounted subvolumes or snapshots.
• Also, if multiple subvolumes of the same BTRFS partition get mounted, only one of them is showing its used/overall space bar below it.

I know this issue has to do with the subvolumes which are no real block devices, but it is confusing and annoying in those cases, where you are using BTRFS subvolumes as a replacement for logical block devices.

Here's an example of Nemo's device list showing a single BTRFS partition with the label "media" and five of its mounted subvolumes (ignore the other three regular block devices):

Expected behavior

Having an option to either

• hide items of the devices list (then the user can simply use bookmarks)
• locally rename items of the devices list (and store this data, based on device UUID and certain mount parameters (subvol or subvolid))
• use the subvol path as name, eg. /@foo or /path/to/subvolume instead of the BTRFS label, unless it is not a subvolume or snapshot
• use the basename of the mounted path

Steps to reproduce

1. Create a new BTRFS partition and give it a label

   mkfs.btrfs -L label /path/to/device

2. Mount it and create subvolumes

   mount -t btrfs /mnt
   btrfs subvolume create /mnt/@foo
   btrfs subvolume create /mnt/@bar
   btrfs subvolume create /mnt/@baz
   umount /mnt

3. Create dirs in /media and mount individual subvolumes

   mkdir -p /media/{foo,bar,baz}
   mount -t btrfs -o subvol=/@foo /media/foo
   mount -t btrfs -o subvol=/@bar /media/bar
   mount -t btrfs -o subvol=/@baz /media/baz

4. Open Nemo and see its devices list showing three mounted devices with the label "label", two of them without a bar

Other information

Related to #1497

[leigh123linux]

Disk names are done by udisks2 not nemo