lkml.org 
[lkml]   [2023]   [May]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH] fuse: fix return value of inode_inline_reclaim_one_dmap in error path
From


On 6/1/23 4:03 AM, Vivek Goyal wrote:
> On Mon, Apr 24, 2023 at 08:32:50PM +0800, Jingbo Xu wrote:
>> When range already got reclaimed by somebody else, return NULL so that
>> the caller could retry to allocate or reclaim another range, instead of
>> mistakenly returning the range already got reclaimed and reused by
>> others.
>>
>> Reported-by: Liu Jiang <gerry@linux.alibaba.com>
>> Fixes: 9a752d18c85a ("virtiofs: add logic to free up a memory range")
>> Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com>
>
> Hi Jingbo,
>
> This patch looks correct to me.
>
> Are you able to reproduce the problem? Or you are fixing it based on
> code inspection?

It's spotted by Liu Jiang during code review. Not tested yet.

>
> How are you testing this? We don't have virtiofsd DAX implementation yet
> in rust virtiofsd yet.
>
> I am not sure how to test this chagne now. We had out of tree patches
> in qemu and now qemu has gotten rid of C version of virtiofsd so these
> patches might not even work now.

Yeah this exception path may not be so easy to be tested as it is only
triggered in the race condition. I have the old branch (of qemu) with
support for DAX, and maybe I could try to reproduce the exception path
by configuring limited DAX window and heavy IO workload.


--
Thanks,
Jingbo

\
 
 \ /
  Last update: 2023-06-01 03:47    [W:0.095 / U:0.776 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site