[7/9] btrfs: add assertion helpers for extent buffer write lock counters
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Message ID 6a524add91073009c459ba97bbc7facd5ae700e1.1552489554.git.dsterba@suse.com
State New
Headers show
Series
  • Extent buffer locking cleanups
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Commit Message

David Sterba March 13, 2019, 3:47 p.m. UTC
The write_locks are a simple counter to track locking balance and used
to assert tree locks.  Add helpers to make it conditionally work only in
DEBUG builds.  Will be used in followup patches.

Signed-off-by: David Sterba <dsterba@suse.com>
---
 fs/btrfs/locking.c | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

Patch
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diff --git a/fs/btrfs/locking.c b/fs/btrfs/locking.c
index e88a0a3d286f..ebde1d943e55 100644
--- a/fs/btrfs/locking.c
+++ b/fs/btrfs/locking.c
@@ -56,6 +56,21 @@  static void btrfs_assert_tree_read_locked(struct extent_buffer *eb)
 	BUG_ON(!atomic_read(&eb->read_locks));
 }
 
+static void btrfs_assert_tree_write_locks_get(struct extent_buffer *eb)
+{
+	atomic_inc(&eb->write_locks);
+}
+
+static void btrfs_assert_tree_write_locks_put(struct extent_buffer *eb)
+{
+	atomic_dec(&eb->write_locks);
+}
+
+void btrfs_assert_tree_locked(struct extent_buffer *eb)
+{
+	BUG_ON(!atomic_read(&eb->write_locks));
+}
+
 #else
 static void btrfs_assert_spinning_writers_get(struct extent_buffer *eb) { }
 static void btrfs_assert_spinning_writers_put(struct extent_buffer *eb) { }
@@ -65,6 +80,9 @@  static void btrfs_assert_spinning_readers_get(struct extent_buffer *eb) { }
 static void btrfs_assert_tree_read_locked(struct extent_buffer *eb) { }
 static void btrfs_assert_tree_read_locks_get(struct extent_buffer *eb) { }
 static void btrfs_assert_tree_read_locks_put(struct extent_buffer *eb) { }
+void btrfs_assert_tree_locked(struct extent_buffer *eb) { }
+static void btrfs_assert_tree_write_locks_get(struct extent_buffer *eb) { }
+static void btrfs_assert_tree_write_locks_put(struct extent_buffer *eb) { }
 #endif
 
 void btrfs_set_lock_blocking_read(struct extent_buffer *eb)
@@ -320,8 +338,3 @@  void btrfs_tree_unlock(struct extent_buffer *eb)
 		write_unlock(&eb->lock);
 	}
 }
-
-void btrfs_assert_tree_locked(struct extent_buffer *eb)
-{
-	BUG_ON(!atomic_read(&eb->write_locks));
-}