On Wed, Apr 06, 2022 at 03:56:01PM +0800, Jeffle Xu wrote:
> Until then erofs is exactly blockdev based filesystem.
>
> A new fscache-based mode is going to be introduced for erofs to support
> scenarios where on-demand read semantics is needed, e.g. container
> image distribution. In this case, erofs could be mounted from data blobs
> through fscache.
>
> Add a helper checking which mode erofs works in.
>
> Signed-off-by: Jeffle Xu <jefflexu@xxxxxxxxxxxxxxxxx>
Reviewed-by: Gao Xiang <hsiangkao@xxxxxxxxxxxxxxxxx>
Thanks,
Gao Xiang
> ---
> fs/erofs/internal.h | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
> index fe9564e5091e..05a97533b1e9 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_fscache_mode(struct super_block *sb)
> +{
> + return IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) && !sb->s_bdev;
> +}
> +
> enum {
> EROFS_ZIP_CACHE_DISABLED,
> EROFS_ZIP_CACHE_READAHEAD,
> --
> 2.27.0
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