Appoint myself page cache maintainer

This feels like a sufficiently distinct area of responsibility to be
worth separating out from both MM and VFS.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Acked-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>

Author: Matthew Wilcox (Oracle)

MAINTAINERS

@@ -14833,6 +14833,19 @@ F:	Documentation/core-api/padata.rst
 F:	include/linux/padata.h
 F:	kernel/padata.c
 
+PAGE CACHE
+M:	Matthew Wilcox (Oracle) <willy@infradead.org>
+L:	linux-fsdevel@vger.kernel.org
+S:	Supported
+T:	git git://git.infradead.org/users/willy/pagecache.git
+F:	Documentation/filesystems/locking.rst
+F:	Documentation/filesystems/vfs.rst
+F:	include/linux/pagemap.h
+F:	mm/filemap.c
+F:	mm/page-writeback.c
+F:	mm/readahead.c
+F:	mm/truncate.c
+
 PAGE POOL
 M:	Jesper Dangaard Brouer <hawk@kernel.org>
 M:	Ilias Apalodimas <ilias.apalodimas@linaro.org>