linux-kernel - Re: [PATCH 01/12] cachefiles: remove request from xarry during flush requests

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Message-ID: <6c04aab1-44d7-464c-8080-b06d5c0f16ee@bytedance.com>
Date: Thu, 25 Apr 2024 11:13:30 +0800
From: Jia Zhu <zhujia.zj@...edance.com>
To: libaokun@...weicloud.com, netfs@...ts.linux.dev
Cc: dhowells@...hat.com, jlayton@...nel.org, jefflexu@...ux.alibaba.com,
 linux-erofs@...ts.ozlabs.org, linux-fsdevel@...r.kernel.org,
 linux-kernel@...r.kernel.org, Baokun Li <libaokun1@...wei.com>,
 zhujia.zj@...edance.com
Subject: Re: [PATCH 01/12] cachefiles: remove request from xarry during flush
 requests



在 2024/4/24 11:39, libaokun@...weicloud.com 写道:
> From: Baokun Li <libaokun1@...wei.com>
> 
> This prevents concurrency from causing access to a freed req.
> 
> Signed-off-by: Baokun Li <libaokun1@...wei.com>

Reviewed-by: Jia Zhu <zhujia.zj@...edance.com>

> ---
>   fs/cachefiles/daemon.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/fs/cachefiles/daemon.c b/fs/cachefiles/daemon.c
> index 6465e2574230..ccb7b707ea4b 100644
> --- a/fs/cachefiles/daemon.c
> +++ b/fs/cachefiles/daemon.c
> @@ -159,6 +159,7 @@ static void cachefiles_flush_reqs(struct cachefiles_cache *cache)
>   	xa_for_each(xa, index, req) {
>   		req->error = -EIO;
>   		complete(&req->done);
> +		__xa_erase(xa, index);
>   	}
>   	xa_unlock(xa);
>