On Tue, Nov 02, 2021 at 08:30:46AM +0000, David Howells wrote:

Add a convenience function, folio_inode() that will get the host inode from
a folio's mapping.

I'm not opposed, but it only saves two characters, so I'm not entirely
sure it justifies its existance.  On the other hand, folio_inode() is
clear about what it does.

+ * For folios which are in the page cache, return the inode that is hosting
+ * this folio belongs to.

This looks like an editing mistake.  Either you meant
'return the inode that hosts this folio' or
'return the inode this folio belongs to'
(and i prefer the second).

With that grammo fixed,

Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>