http://bugzilla.opensuse.org/show_bug.cgi?id=1057962 Bug ID: 1057962 Summary: Btrfs: 'cp --reflinks' exceeds quota limit without error Classification: openSUSE Product: openSUSE Tumbleweed Version: Current Hardware: Other OS: Other Status: NEW Severity: Normal Priority: P5 - None Component: Kernel Assignee: kernel-maintainers@forge.provo.novell.com Reporter: antoine.belvire@opensuse.org QA Contact: qa-bugs@suse.de Found By: --- Blocker: --- It looks like it's to possible to largely exceed quota limit on rfer size without error, using cp --reflinks. Tested on Tumbleweed with kernel-default 4.12 and also with kernel-default 4.13 from Kernel:stable. Reproducible: always Steps to reproduce: 1. Make sure quotas are enabled 2. Create '/test/' and '/test/a' subvolumes:

btrfs subvolume create /test btrfs subvolume create /test/a

3. Set limits for '/test/a' qgroup:

btrfs qgroup limit 10m <qgroupid> / btrfs qgroup limit -e 5m <qgroupid> /

`btrfs qgroup show -erF /test/a/` returns: qgroupid rfer excl max_rfer max_excl -------- ---- ---- -------- -------- (the id) 16.00KiB 16.00KiB 10.00MiB 5.00MiB 4. Write a big file in '/test', here 50 MB:

dd if=/dev/urandom of=/test/bigfile bs=1M count=50

5. Copy with reflink '/test/bigfile' to '/test/a/bigfile':

cp --reflink /test/bigfile /test/a

Actual results: * no error when doing cp --reflink * Quota is largely exceeded:

~# btrfs filesystem sync / ~# btrfs qgroup show -erF /test/a/ qgroupid rfer excl max_rfer max_excl -------- ---- ---- -------- -------- (the id) 50.02MiB 16.00KiB 10.00MiB 5.00MiB ~#

Expected results: * Disk quota error when doing cp --reflink * rfer below max_rfer -- You are receiving this mail because: You are on the CC list for the bug.