btrfs: add assertion helpers for spinning writers

Add helpers for conditional DEBUG build to assert that the extent buffer
spinning_writers constraints are met. Will be used in followup patches.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/locking.c b/fs/btrfs/locking.c
index 82b84e4daad1f336fc8b6de895d445682308f3ef..13ef1decdea60b2b9b9e365ca990ba02e0f9d66d 100644 (file)
--- 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);
 
 
 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)
 {
        /*
 void btrfs_set_lock_blocking_read(struct extent_buffer *eb)
 {
        /*