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

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Date:   Mon, 28 Mar 2022 10:42:42 +0800
From:   Gao Xiang <hsiangkao@...ux.alibaba.com>
To:     Jeffle Xu <jefflexu@...ux.alibaba.com>
Cc:     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 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()?

Thanks,
Gao Xiang

> +{
> +	return !sb->s_bdev;
> +}
> +
>  enum {
>  	EROFS_ZIP_CACHE_DISABLED,
>  	EROFS_ZIP_CACHE_READAHEAD,
> -- 
> 2.27.0