[PATCH 1/2] btrfs: assert for num_devices below 0

[Anand Jain <anand.jain@oracle.com>]

In preparation to add helper function to deduce the num_devices with
replace running, use assert instead of bug_on and warn_on.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
---
 fs/btrfs/volumes.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index b6d9b6a6fba7..0062615a79be 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1877,7 +1877,7 @@ int btrfs_rm_device(struct btrfs_fs_info *fs_info, const char *device_path,
 	num_devices = fs_devices->num_devices;
 	btrfs_dev_replace_read_lock(&fs_info->dev_replace);
 	if (btrfs_dev_replace_is_ongoing(&fs_info->dev_replace)) {
-		WARN_ON(num_devices < 1);
+		ASSERT(num_devices > 0);
 		num_devices--;
 	}
 	btrfs_dev_replace_read_unlock(&fs_info->dev_replace);
@@ -3752,7 +3752,7 @@ int btrfs_balance(struct btrfs_fs_info *fs_info,
 	num_devices = fs_info->fs_devices->num_devices;
 	btrfs_dev_replace_read_lock(&fs_info->dev_replace);
 	if (btrfs_dev_replace_is_ongoing(&fs_info->dev_replace)) {
-		BUG_ON(num_devices < 1);
+		ASSERT(num_devices > 0);
 		num_devices--;
 	}
 	btrfs_dev_replace_read_unlock(&fs_info->dev_replace);
-- 
2.7.0