Re: [PATCH v3 1/4] fs/dcache: Fix incorrect nr_dentry_unused accounting in shrink_dcache_sb()

[Waiman Long]

On 09/11/2018 06:02 PM, Dave Chinner wrote:
> On Tue, Sep 11, 2018 at 03:18:23PM -0400, Waiman Long wrote:
>> The nr_dentry_unused per-cpu counter tracks dentries in both the
>> LRU lists and the shrink lists where the DCACHE_LRU_LIST bit is set.
>> The shrink_dcache_sb() function moves dentries from the LRU list to a
>> shrink list and subtracts the dentry count from nr_dentry_unused. This
>> is incorrect as the nr_dentry_unused count Will also be decremented in
>> shrink_dentry_list() via d_shrink_del(). To fix this double decrement,
>> the decrement in the shrink_dcache_sb() function is taken out.
>>
>> Fixes: 4e717f5c1083 ("list_lru: remove special case function list_lru_dispose_all."
>>
>> Signed-off-by: Waiman Long <longman@xxxxxxxxxx>
> Please add a stable tag for this.
>
> Otherwise looks fine.
>
> Reviewed-by: Dave Chinner <dchinner@xxxxxxxxxx>
>
I will add the cc:stable tag.

Cheers,
Longman