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Btrfs: move btrfs_free_qgroup_config() out of spin_lock and fix comments 

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 <wangsl.fnst@cn.fujitsu.com>
Reviewed-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This commit is contained in:
Wang Shilong 2013-08-14 09:13:37 +08:00 committed by Chris Mason
parent 4082bd3d73
commit e685da14af
1 changed files with 6 additions and 3 deletions
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9
fs/btrfs/qgroup.c
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@ -432,8 +432,10 @@ int btrfs_read_qgroup_config(struct btrfs_fs_info *fs_info)
}
/*
* 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;