From e4e9fd0f326212ee3971418334c255a26c8a2735 Mon Sep 17 00:00:00 2001 From: David Sterba Date: Fri, 24 Aug 2018 14:45:20 +0200 Subject: [PATCH] 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 Reviewed-by: Johannes Thumshirn Signed-off-by: David Sterba --- fs/btrfs/locking.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/fs/btrfs/locking.c b/fs/btrfs/locking.c index 82b84e4..13ef1de 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) { /* -- 2.7.4