All,
When adding a subvolume to a qgroup, pre-existing files in that
subvolume are not counted in the referenced/exclusive space of the
qgroup. Is this intended behavior ?
I create a subvol with one file:
# mkfs.btrfs /dev/sdg
# mount /dev/sdg /mnt/fulldisk
# cd /mnt/fulldisk
# btrfs quota enable ./
# btrfs sub create sub1
# dd if=/dev/zero of=sub1/file1 bs=100000 count=1
# sync
# btrfs qgroup show ./
0/257 106496 106496
Now I create a new qgroup on level 1 and add the qgroup of sub1 to it :
# btrfs qgroup create 1/0 ./
# btrfs qgroup assign 0/257 1/0 ./
# sync
# btrfs fi sync ./
# btrfs quota rescan ./
# btrfs quota rescan ./sub1
# btrfs qgroup show ./
0/257 106496 106496
1/0 0 0
The pre-existing file does not contribute to the space numbers.
Let's create a new file:
# dd if=/dev/zero of=sub1/file2 bs=50000 count=1
# sync
# btrfs qgroup show ./
0/257 159744 159744
1/0 53248 53248
We see that only the new file is included in the space numbers.
Now I remove the first file:
# rm -f sub1/file1
# sync
# btrfs qgroup show ./
0/257 57344 57344
1/0 -49152 -49152
The space numbers go below zero. Even if the behavior above is intended,
the removal of the pre-existing file should not result in negative space
numbers.
Koen.
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