Add helpers for conditional DEBUG build to assert that the extent buffer
spinning_readers constraints are met. Will be used in followup patches.
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
---
fs/btrfs/locking.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/fs/btrfs/locking.c b/fs/btrfs/locking.c
index a5a3c5118f61..2dd3ae524aa3 100644
--- a/fs/btrfs/locking.c
+++ b/fs/btrfs/locking.c
@@ -32,10 +32,23 @@ static void btrfs_assert_no_spinning_writers(struct extent_buffer *eb)
WARN_ON(atomic_read(&eb->spinning_writers));
}
+static void btrfs_assert_spinning_readers_get(struct extent_buffer *eb)
+{
+ atomic_inc(&eb->spinning_readers);
+}
+
+static void btrfs_assert_spinning_readers_put(struct extent_buffer *eb)
+{
+ WARN_ON(atomic_read(&eb->spinning_readers) == 0);
+ atomic_dec(&eb->spinning_readers);
+}
+
#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) { }
+static void btrfs_assert_spinning_readers_put(struct extent_buffer *eb) { }
+static void btrfs_assert_spinning_readers_get(struct extent_buffer *eb) { }
#endif
void btrfs_set_lock_blocking_read(struct extent_buffer *eb)
--
2.20.1
