From 225948dedc9d3ac514eb1f4b7318d541cfd80aaf Mon Sep 17 00:00:00 2001 From: David Sterba Date: Fri, 24 Aug 2018 15:53:42 +0200 Subject: [PATCH] btrfs: add assertion helpers for spinning readers Add helpers for conditional DEBUG build to assert that the extent buffer spinning_readers 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 | 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) -- 2.30.2