Add helpers for conditional DEBUG build to assert that the extent buffer
spinning_writers constraints are met. Will be used in followup patches.
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
---
fs/btrfs/locking.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/fs/btrfs/locking.c b/fs/btrfs/locking.c
index 82b84e4daad1..13ef1decdea6 100644
--- a/fs/btrfs/locking.c
+++ b/fs/btrfs/locking.c
@@ -14,6 +14,30 @@
static void btrfs_assert_tree_read_locked(struct extent_buffer *eb);
+#ifdef CONFIG_BTRFS_DEBUG
+static void btrfs_assert_spinning_writers_get(struct extent_buffer *eb)
+{
+ WARN_ON(atomic_read(&eb->spinning_writers));
+ atomic_inc(&eb->spinning_writers);
+}
+
+static void btrfs_assert_spinning_writers_put(struct extent_buffer *eb)
+{
+ WARN_ON(atomic_read(&eb->spinning_writers) != 1);
+ atomic_dec(&eb->spinning_writers);
+}
+
+static void btrfs_assert_no_spinning_writers(struct extent_buffer *eb)
+{
+ WARN_ON(atomic_read(&eb->spinning_writers));
+}
+
+#else
+static void btrfs_assert_spinning_writers_get(struct extent_buffer *eb) { }
+static void btrfs_assert_spinning_writers_put(struct extent_buffer *eb) { }
+static void btrfs_assert_no_spinning_writers(struct extent_buffer *eb) { }
+#endif
+
void btrfs_set_lock_blocking_read(struct extent_buffer *eb)
{
/*
--
2.20.1
