I am sorry, please ignore this…I will resend it..
> From: Wang Shilong <wangsl-f...@fujitsu.com>
>
> Step to reproduce:
> mkfs.btrfs <disk>
> mount <disk> <mnt>
> dd if=/dev/zero of=/<mnt>/data bs=1M count=10
> sync
> btrfs quota enable <mnt>
> btrfs qgroup create 0/5 <mnt>
> btrfs qgroup limit 5M 0/5 <mnt>
> rm -f /<mnt>/data
> sync
> btrfs qgroup show <mnt>
> dd if=/dev/zero of=data bs=1M count=1
>
> From the perspective of users, qgroup's referenced or exclusive
> is negative,but user can not continue to write data! a workaround
> way is to cast u64 to s64 when doing qgroup reservation.
>
> Signed-off-by: Wang Shilong <wangsl-f...@cn.fujitsu.com>
> Reviewed-by: Arne Jansen <sensi...@gmx.net>
> ---
> Changelog v1->v2:
> -use s64 instead of signed long long
> ---
> 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 b44124d..ab364a2 100644
> --- a/fs/btrfs/qgroup.c
> +++ b/fs/btrfs/qgroup.c
> @@ -1523,14 +1523,14 @@ int btrfs_qgroup_reserve(struct btrfs_root *root, u64
> num_bytes)
> qg = (struct btrfs_qgroup *)(uintptr_t)unode->aux;
>
> if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_RFER) &&
> - qg->reserved + qg->rfer + num_bytes >
> + qg->reserved + (s64)qg->rfer + num_bytes >
> qg->max_rfer) {
> ret = -EDQUOT;
> goto out;
> }
>
> if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) &&
> - qg->reserved + qg->excl + num_bytes >
> + qg->reserved + (s64)qg->excl + num_bytes >
> qg->max_excl) {
> ret = -EDQUOT;
> goto out;
> --
> 1.7.11.7
>
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