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Date:   Mon, 20 Feb 2017 08:15:21 -0700
From:   Jens Axboe <>
To:     Elena Reshetova <>,
Subject: Re: [PATCH 0/5] block subsystem refcounter conversions

On 02/20/2017 04:16 AM, Elena Reshetova wrote:
> Now when new refcount_t type and API are finally merged
> (see include/linux/refcount.h), the following
> patches convert various refcounters in the block susystem from atomic_t
> to refcount_t. By doing this we prevent intentional or accidental
> underflows or overflows that can led to use-after-free vulnerabilities.
> The below patches are fully independent and can be cherry-picked separately.
> Since we convert all kernel subsystems in the same fashion, resulting
> in about 300 patches, we have to group them for sending at least in some
> fashion to be manageable. Please excuse the long cc list.
> Elena Reshetova (5):
>   block: convert bio.__bi_cnt from atomic_t to refcount_t
>   block: convert blk_queue_tag.refcnt from atomic_t to refcount_t
>   block: convert blkcg_gq.refcnt from atomic_t to refcount_t
>   block: convert io_context.active_ref from atomic_t to refcount_t
>   block: convert bsg_device.ref_count from atomic_t to refcount_t

I went to look at the implementation, and the size of a refcount_t.
But the code is not there?! You say it's finally merged, where is
it merged? Don't send code like this without the necessary
infrastructure being in mainline.

Jens Axboe

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