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Date: Thu, 7 Apr 2022 10:46:04 +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 v8 09/20] erofs: add mode checking helper 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@...ux.alibaba.com> Reviewed-by: Gao Xiang <hsiangkao@...ux.alibaba.com> 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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