Re: [PATCH 1/3] btrfs: warn for num_devices below 0

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On 07/12/2018 03:13 PM, Nikolay Borisov wrote:


On 10.07.2018 21:22, Anand Jain wrote:
In preparation to de-duplicate a section of code where we deduce the
num_devices, use warn instead of bug.

Signed-off-by: Anand Jain <anand.jain@xxxxxxxxxx>
---
  fs/btrfs/volumes.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index eb78bb8d1108..ce6faeb8bcf8 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -3813,7 +3813,7 @@ 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);
+		WARN_ON(num_devices < 1);


Isn't dev_replace_is_ongoing && num_devices < 1 indeed a logical bug
situation? Under what condition can it happen that you deem "non
critical" ?

 In all conditions needs least one device for the FS to be mounted.
 In fact we can just remove it.

Thanks, Anand

  		num_devices--;
  	}
  	btrfs_dev_replace_read_unlock(&fs_info->dev_replace);

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