From: Zhao Lei <zhaolei@xxxxxxxxxxxxxx>
space_info's value calculation is some complex and easy to cause
bug, add WARN_ON() to help debug.
Changelog v1->v2:
Put WARN_ON()s under the ENOSPC_DEBUG mount option.
Suggested by: David Sterba <dsterba@xxxxxxx>
Signed-off-by: Zhao Lei <zhaolei@xxxxxxxxxxxxxx>
---
fs/btrfs/extent-tree.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index bfb9105..6c19033 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -9415,9 +9415,19 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
spin_lock(&block_group->space_info->lock);
list_del_init(&block_group->ro_list);
+
+ if (btrfs_test_opt(root, ENOSPC_DEBUG)) {
+ WARN_ON(block_group->space_info->total_bytes
+ < block_group->key.offset);
+ WARN_ON(block_group->space_info->bytes_readonly
+ < block_group->key.offset);
+ WARN_ON(block_group->space_info->disk_total
+ < block_group->key.offset * factor);
+ }
block_group->space_info->total_bytes -= block_group->key.offset;
block_group->space_info->bytes_readonly -= block_group->key.offset;
block_group->space_info->disk_total -= block_group->key.offset * factor;
+
spin_unlock(&block_group->space_info->lock);
memcpy(&key, &block_group->key, sizeof(key));
--
1.8.5.1
--
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