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fs: Allow fine-grained control of folio sizes
Some filesystems want to be able to limit the maximum size of folios, and some want to be able to ensure that folios are at least a certain size. Add mapping_set_folio_orders() to allow this level of control. The max folio order parameter is ignored and it is always set to MAX_PAGECACHE_ORDER. [Pankaj]: added mapping_min_folio_order(), changed MAX_MASK to 0x0003e000 Signed-off-by: Pankaj Raghav <p.raghav@samsung.com> [mcgrof: rebase in light of "mm, netfs, fscache: stop read optimisation when folio removed from pagecache" which adds AS_RELEASE_ALWAYS] Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
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