Hi Yang,
This is how to reproduce the bug,
[root@algodev ~]# uname -r
3.18.0+
[root@algodev ~]# btrfs version
Btrfs v3.18-2-g6938452-dirty
[root@algodev ~]# btrfs quota enable LOOP/
[root@algodev ~]# btrfs qgroup show LOOP/
qgroupid rfer excl
-------- ---- ----
0/5 16384 16384
[root@algodev ~]# btrfs subvol create LOOP/subvol1
Create subvolume 'LOOP/subvol1'
[root@algodev ~]# btrfs qgroup limit 1g LOOP/subvol1/
[root@algodev ~]# btrfs qgroup show LOOP/
qgroupid rfer excl
-------- ---- ----
0/5 16384 16384
0/258 16384 16384
[root@algodev ~]# dd if=/dev/zero of=LOOP/subvol1/bigfile
dd: writing to ‘LOOP/subvol1/bigfile’: Disk quota exceeded
2097018+0 records in
2097017+0 records out
1073672704 bytes (1.1 GB) copied, 10.0759 s, 107 MB/s
[root@algodev ~]# rm -f LOOP/subvol1/bigfile
rm: cannot remove ‘LOOP/subvol1/bigfile’: Disk quota exceeded
[root@algodev ~]#
Best Regards,
~Khaled Ahmed
On Jan 3, 2015, at 4:09 AM, Dongsheng Yang <dongsheng081...@gmail.com> wrote:
> Hi Khaled,
>
> Could you give use more description about the problem this patch
> is trying to solve? Maybe an example will help a lot to understand it.
>
> Thanx
>
> On Fri, Jan 2, 2015 at 7:48 AM, Khaled Ahmed <khaled....@gmail.com> wrote:
>> Signed-off-by: Khaled Ahmed <khaled....@gmail.com>
>> ---
>> fs/btrfs/qgroup.c | 4 ++--
>> 1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
>> index 48b60db..b85200d 100644
>> --- a/fs/btrfs/qgroup.c
>> +++ b/fs/btrfs/qgroup.c
>> @@ -2408,14 +2408,14 @@ int btrfs_qgroup_reserve(struct btrfs_root *root,
>> u64 num_bytes)
>>
>> if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_RFER) &&
>> qg->reserved + (s64)qg->rfer + num_bytes >
>> - qg->max_rfer) {
>> + qg->max_rfer - 1 ) {
>> ret = -EDQUOT;
>> goto out;
>> }
>>
>> if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) &&
>> qg->reserved + (s64)qg->excl + num_bytes >
>> - qg->max_excl) {
>> + qg->max_excl - 1) {
>> ret = -EDQUOT;
>> goto out;
>> }
>> --
>> 2.1.0
>>
>> --
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