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.. SPDX-License-Identifier: GPL-2.0
==========
Page Cache
==========
The page cache is the primary way that the user and the rest of the kernel
interact with filesystems. It can be bypassed (e.g. with O_DIRECT),
but normal reads, writes and mmaps go through the page cache.
Folios
======
The folio is the unit of memory management within the page cache.
Operations