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Added an interesting note

edited Mar 14, 2015 at 22:09

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As demonstrated here, this is actually fairly simple to do.

First, enable btrfs quotas:

# btrfs quota enable /btrfs_subvolume

And then run:

# btrfs qgroup show /btrfs_subvolume OR # btrfs qgroup show -f /btrfs_subvolume

Which in Btrfs v3.18.2 shows you this:

qgroupid rfer excl -------- ---- ---- 0/260 1.09GiB 1.09GiB

The 0/260 is the subvolume ID, and the excl is the exclusive data in the subvolume. If you delete the subvolume, that's how much space you'll free up.

Edit: According to this link, this appears to be the official recommended way to do this.

As demonstrated here, this is actually fairly simple to do.

First, enable btrfs quotas:

# btrfs quota enable /btrfs_subvolume

And then run:

# btrfs qgroup show /btrfs_subvolume OR # btrfs qgroup show -f /btrfs_subvolume

Which in Btrfs v3.18.2 shows you this:

qgroupid rfer excl -------- ---- ---- 0/260 1.09GiB 1.09GiB

The 0/260 is the subvolume ID, and the excl is the exclusive data in the subvolume. If you delete the subvolume, that's how much space you'll free up.

As demonstrated here, this is actually fairly simple to do.

First, enable btrfs quotas:

# btrfs quota enable /btrfs_subvolume

And then run:

# btrfs qgroup show /btrfs_subvolume OR # btrfs qgroup show -f /btrfs_subvolume

Which in Btrfs v3.18.2 shows you this:

qgroupid rfer excl -------- ---- ---- 0/260 1.09GiB 1.09GiB

The 0/260 is the subvolume ID, and the excl is the exclusive data in the subvolume. If you delete the subvolume, that's how much space you'll free up.

Edit: According to this link, this appears to be the official recommended way to do this.

Source Link

answered Mar 14, 2015 at 2:05

Tal

2.3k
5
27
39

As demonstrated here, this is actually fairly simple to do.

First, enable btrfs quotas:

# btrfs quota enable /btrfs_subvolume

And then run:

# btrfs qgroup show /btrfs_subvolume OR # btrfs qgroup show -f /btrfs_subvolume

Which in Btrfs v3.18.2 shows you this:

qgroupid rfer excl -------- ---- ---- 0/260 1.09GiB 1.09GiB

The 0/260 is the subvolume ID, and the excl is the exclusive data in the subvolume. If you delete the subvolume, that's how much space you'll free up.