Re: [PATCH] zram: move init_done check to the beginning of disksize_store

[Geliang Tang <geliangtang@163.com>]

On Mon, Nov 02, 2015 at 08:43:58AM +0900, Sergey Senozhatsky wrote:
> On (10/31/15 22:50), Geliang Tang wrote:
> > 
> > If we set disksize when disksize has been set, we will get the following
> > error report: "write error: Cannot allocate memory". This is because
> > disksize_store fails at zram_meta_alloc.
> 
> Those things are not connected, absolutely. zram_meta_alloc() can fail
> even on un-initialized device. In any case disksize_store() does not end
> up changing the state of the device and reports the error back, so I don't
> see any real value in this change. Seems that we come across this change
> something like once a year (this patch is not the first).

Thanks for your reply.

zram_meta_alloc() always fails on initialized device at debugfs_create_dir():
debugfs dir <zram0> creation failed
zram: Error creating memory pool

I think we should deal with this error.

> 
> I believe it has to stay the way it is, see https://lkml.org/lkml/2014/2/27/674

Unlike above, this patch did not call zram_meta_alloc() in lock. So it
would not cause the deed lock problem.

Geliang Tang