Currently, the default max thread pool size is hardcoded as 8. This
number is not only used in one place. Keep the default max thread pool
size in sync by introducing a new macro.

Signed-off-by: Ammar Faizi <ammarfaizi2@gnuweeb.org>
---
 fs/btrfs/async-thread.h | 2 ++
 fs/btrfs/disk-io.c      | 3 ++-
 fs/btrfs/super.c        | 3 ++-
 3 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/fs/btrfs/async-thread.h b/fs/btrfs/async-thread.h
index 2b8a76fa75ef9e69..f11c3b36568053be 100644
--- a/fs/btrfs/async-thread.h
+++ b/fs/btrfs/async-thread.h
@@ -9,6 +9,8 @@
 
 #include <linux/workqueue.h>
 
+#define BTRFS_DEFAULT_MAX_THREAD_POOL_SIZE 8
+
 struct btrfs_fs_info;
 struct btrfs_workqueue;
 struct btrfs_work;
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 1bb1db461a30fa71..4f4ddc8e088b08ec 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2957,7 +2957,8 @@ void btrfs_init_fs_info(struct btrfs_fs_info *fs_info)
 	btrfs_init_ref_verify(fs_info);
 
 	fs_info->thread_pool_size = min_t(unsigned long,
-					  num_online_cpus() + 2, 8);
+					  num_online_cpus() + 2,
+					  BTRFS_DEFAULT_MAX_THREAD_POOL_SIZE);
 
 	INIT_LIST_HEAD(&fs_info->ordered_roots);
 	spin_lock_init(&fs_info->ordered_root_lock);
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 34b7c5810d34d624..bf4be383e289ef6c 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -333,7 +333,8 @@ static void adjust_default_thread_pool_size(struct btrfs_fs_info *info)
 	}
 
 	old_thread_pool_size = info->thread_pool_size;
-	new_thread_pool_size = min_t(unsigned long, total_usable_cpu + 2, 8);
+	new_thread_pool_size = min_t(unsigned long, total_usable_cpu + 2,
+				     BTRFS_DEFAULT_MAX_THREAD_POOL_SIZE);
 
 	if (old_thread_pool_size == new_thread_pool_size)
 		return;
-- 
Ammar Faizi