From ed1b4ed79df258f08f16eac4a4fb96dc6d1a0f3a Mon Sep 17 00:00:00 2001 From: David Sterba Date: Fri, 24 Aug 2018 16:31:17 +0200 Subject: [PATCH] btrfs: switch extent_buffer::lock_nested to bool The member is tracking simple status of the lock, we can use bool for that and make some room for further space reduction in the structure. Reviewed-by: Nikolay Borisov Reviewed-by: Johannes Thumshirn Signed-off-by: David Sterba --- fs/btrfs/extent_io.c | 2 +- fs/btrfs/extent_io.h | 2 +- fs/btrfs/locking.c | 6 +++--- 3 files changed, 5 insertions(+), 5 deletions(-) diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 97d32b80060d..d61b526dc856 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -4679,7 +4679,7 @@ __alloc_extent_buffer(struct btrfs_fs_info *fs_info, u64 start, rwlock_init(&eb->lock); atomic_set(&eb->blocking_readers, 0); atomic_set(&eb->blocking_writers, 0); - eb->lock_nested = 0; + eb->lock_nested = false; init_waitqueue_head(&eb->write_lock_wq); init_waitqueue_head(&eb->read_lock_wq); diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h index 43a9530279db..586baed03780 100644 --- a/fs/btrfs/extent_io.h +++ b/fs/btrfs/extent_io.h @@ -162,7 +162,7 @@ struct extent_buffer { atomic_t blocking_writers; atomic_t blocking_readers; - short lock_nested; + bool lock_nested; /* >= 0 if eb belongs to a log tree, -1 otherwise */ short log_index; diff --git a/fs/btrfs/locking.c b/fs/btrfs/locking.c index 3f7b5989e31e..6df03ba36026 100644 --- a/fs/btrfs/locking.c +++ b/fs/btrfs/locking.c @@ -172,7 +172,7 @@ again: * called on a partly (write-)locked tree. */ BUG_ON(eb->lock_nested); - eb->lock_nested = 1; + eb->lock_nested = true; read_unlock(&eb->lock); return; } @@ -261,7 +261,7 @@ void btrfs_tree_read_unlock(struct extent_buffer *eb) * field only matters to the lock owner. */ if (eb->lock_nested && current->pid == eb->lock_owner) { - eb->lock_nested = 0; + eb->lock_nested = false; return; } btrfs_assert_tree_read_locked(eb); @@ -282,7 +282,7 @@ void btrfs_tree_read_unlock_blocking(struct extent_buffer *eb) * field only matters to the lock owner. */ if (eb->lock_nested && current->pid == eb->lock_owner) { - eb->lock_nested = 0; + eb->lock_nested = false; return; } btrfs_assert_tree_read_locked(eb); -- 2.30.2