linux-kernel - Re: [PATCH v6 10/22] erofs: add mode checking helper

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Date:   Mon, 28 Mar 2022 10:46:15 +0800
From:   JeffleXu <jefflexu@...ux.alibaba.com>
To:     dhowells@...hat.com, linux-cachefs@...hat.com, xiang@...nel.org,
        chao@...nel.org, linux-erofs@...ts.ozlabs.org,
        torvalds@...ux-foundation.org, gregkh@...uxfoundation.org,
        willy@...radead.org, linux-fsdevel@...r.kernel.org,
        joseph.qi@...ux.alibaba.com, bo.liu@...ux.alibaba.com,
        tao.peng@...ux.alibaba.com, gerry@...ux.alibaba.com,
        eguan@...ux.alibaba.com, linux-kernel@...r.kernel.org,
        luodaowen.backend@...edance.com, tianzichen@...ishou.com,
        fannaihao@...du.com
Subject: Re: [PATCH v6 10/22] erofs: add mode checking helper



On 3/28/22 10:42 AM, Gao Xiang wrote:
> On Fri, Mar 25, 2022 at 08:22:11PM +0800, Jeffle Xu wrote:
>> Until then erofs is exactly blockdev based filesystem. In other using
>> scenarios (e.g. container image), erofs needs to run upon files.
>>
>> This patch set is going to introduces a new nodev mode, in which erofs
>> could be mounted from a bootstrap blob file containing complete erofs
>> image.
>>
>> Add a helper checking which mode erofs works in.
>>
>> Signed-off-by: Jeffle Xu <jefflexu@...ux.alibaba.com>
>> ---
>>  fs/erofs/internal.h | 5 +++++
>>  1 file changed, 5 insertions(+)
>>
>> diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
>> index e424293f47a2..1486e2573667 100644
>> --- a/fs/erofs/internal.h
>> +++ b/fs/erofs/internal.h
>> @@ -161,6 +161,11 @@ struct erofs_sb_info {
>>  #define set_opt(opt, option)	((opt)->mount_opt |= EROFS_MOUNT_##option)
>>  #define test_opt(opt, option)	((opt)->mount_opt & EROFS_MOUNT_##option)
>>  
>> +static inline bool erofs_is_nodev_mode(struct super_block *sb)
> 
> I've seen a lot of such
> 
> +		if (IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) &&
> +		    erofs_is_nodev_mode(sb)) {
> 
> usages in the followup patches, which makes me wonder if the configuration
> can be checked in the helper as well. Also maybe rename it as
> erofs_is_fscache_mode()?
> 

Sure. Will be done in the next version.

-- 
Thanks,
Jeffle