add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/nilfs2/mdt.h
..
..
@@ -18,14 +18,12 @@
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 /**
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  * struct nilfs_shadow_map - shadow mapping of meta data file
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  * @bmap_store: shadow copy of bmap state
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- * @frozen_data: shadowed dirty data pages
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- * @frozen_btnodes: shadowed dirty b-tree nodes' pages
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+ * @inode: holder of page caches used in shadow mapping
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  * @frozen_buffers: list of frozen buffers
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  */
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 struct nilfs_shadow_map {
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 	struct nilfs_bmap_store bmap_store;
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-	struct address_space frozen_data;
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-	struct address_space frozen_btnodes;
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+	struct inode *inode;
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 	struct list_head frozen_buffers;
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 };
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