From: Wang Shilong <wangsl-f...@cn.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 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html