From: David Sterba <dsterba@suse.com>
Date: Fri, 24 Aug 2018 14:31:17 +0000 (+0200)
Subject: btrfs: switch extent_buffer::lock_nested to bool
X-Git-Tag: v5.4-rc1~779^2~222
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ed1b4ed79df258f08f16eac4a4fb96dc6d1a0f3a;p=platform%2Fkernel%2Flinux-rpi.git

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

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 97d32b8..d61b526dc 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 43a9530..586baed 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 3f7b598..6df03ba 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);