[PATCH v4 1/3] btrfs: add might_sleep() to some places in update_qgroup_limit_item()

[ChenXiaoSong <chenxiaosong2@huawei.com>]

As the potential sleeping under spin lock is hard to spot, we should add
might_sleep() to some places.

Signed-off-by: ChenXiaoSong <chenxiaosong2@huawei.com>
---
 fs/btrfs/ctree.c  | 2 ++
 fs/btrfs/qgroup.c | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index a9543f01184c..809053e9cfde 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -1934,6 +1934,8 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 	int min_write_lock_level;
 	int prev_cmp;
 
+	might_sleep();
+
 	lowest_level = p->lowest_level;
 	WARN_ON(lowest_level && ins_len > 0);
 	WARN_ON(p->nodes[0] != NULL);
diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index 9334c3157c22..d0480b9c6c86 100644
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -779,6 +779,8 @@ static int update_qgroup_limit_item(struct btrfs_trans_handle *trans,
 	int ret;
 	int slot;
 
+	might_sleep();
+
 	key.objectid = 0;
 	key.type = BTRFS_QGROUP_LIMIT_KEY;
 	key.offset = qgroup->qgroupid;
-- 
2.31.1