On 04/20/2018 12:33 AM, David Sterba wrote:
Balance cannot be started on a read-only filesystem and will have to
finish/exit before eg. going to read-only via remount.
It can be paused as well.
btrfs balance pause /btrfs && mount -o remount,ro /dev/sdb /btrfs
@@ -4053,15 +4053,20 @@ int btrfs_pause_balance(struct btrfs_fs_info *fs_info)
int btrfs_cancel_balance(struct btrfs_fs_info *fs_info)
{
- if (sb_rdonly(fs_info->sb))
- return -EROFS;
-
mutex_lock(&fs_info->balance_mutex);
if (!fs_info->balance_ctl) {
mutex_unlock(&fs_info->balance_mutex);
return -ENOTCONN;
}
+ /*
+ * A paused balance with the item stored on disk can be resumed at
+ * mount time if the mount is read-write. Otherwise it's still paused
+ * and we must not allow cancelling as it deletes the item.
+ */
+ if (sb_rdonly(fs_info->sb))
+ return -EROFS;
+
mutex_unlock(&fs_info->balance_mutex); ?
Thanks, Anand
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