On Sat, Dec 05, 2015 at 09:57:18AM +0000, Wang, Zhiye wrote:
> Hi all,
> 
> 
> If I understand it correctly, defragment operation is done in user space 
> tools, while scrub/re-balance is done in kernel thread.

Defragment is done via a IOCTL, so it also works in the kernel.

> 
> 
> So, if my kernel module calls freeze_bdev when scrub/re-balance is in 
> progress, will I still be able to get a consistent file system state?

It should be like that with COW enabled.

Thanks,

-liubo
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