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1.. SPDX-License-Identifier: GPL-2.02 3==========4Page Cache5==========6 7The page cache is the primary way that the user and the rest of the kernel8interact with filesystems. It can be bypassed (e.g. with O_DIRECT),9but normal reads, writes and mmaps go through the page cache.10 11Folios12======13 14The folio is the unit of memory management within the page cache.15Operations 16