btrfs_free_qgroup_config() is not only called by open/close_ctree(),but also btrfs_disable_quota().And for btrfs_disable_quota(),we have set 'quota_root' to be null before calling btrfs_free_qgroup_config(),so it is safe to cleanup in-memory structures without lock held.
Signed-off-by: Wang Shilong <[email protected]> Reviewed-by: Miao Xie <[email protected]> --- v1->v2: fix a type spotted by Arne --- fs/btrfs/qgroup.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c index 57b9805..01eeffe 100644 --- a/fs/btrfs/qgroup.c +++ b/fs/btrfs/qgroup.c @@ -432,8 +432,10 @@ out: } /* - * This is only called from close_ctree() or open_ctree(), both in single- - * treaded paths. Clean up the in-memory structures. No locking needed. + * This is called from close_ctree() or open_ctree() or btrfs_quota_disable(), + * first two are in single-threaded paths.And for the third one, we have set + * quota_root to be null with qgroup_lock held before, so it is safe to clean + * up the in-memory structures without qgroup_lock held. */ void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info) { @@ -937,9 +939,10 @@ int btrfs_quota_disable(struct btrfs_trans_handle *trans, fs_info->pending_quota_state = 0; quota_root = fs_info->quota_root; fs_info->quota_root = NULL; - btrfs_free_qgroup_config(fs_info); spin_unlock(&fs_info->qgroup_lock); + btrfs_free_qgroup_config(fs_info); + if (!quota_root) { ret = -EINVAL; goto out; -- 1.8.0.1 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
