[PATCH v2 09/20] erofs: add mode checking helper

Jeffle Xu jefflexu at linux.alibaba.com
Wed Jan 19 00:12:05 AEDT 2022

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

Add a helper checking which mode erofs works in.

Signed-off-by: Jeffle Xu <jefflexu at linux.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 f9f94d63d40f..2b9337d385ce 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_bdev_mode(struct super_block *sb)
+	return sb->s_bdev;
 enum {

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