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Intended to be used with RWF_UNCACHED, to avoid needing sync writes for uncached IO. Signed-off-by: Jens Axboe --- mm/filemap.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/mm/filemap.c b/mm/filemap.c index 6f65025782bb..1e455ca872b5 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -1634,6 +1634,18 @@ void folio_end_writeback(struct folio *folio) if (__folio_end_writeback(folio)) folio_wake_bit(folio, PG_writeback); acct_reclaim_writeback(folio); + + /* + * If folio is marked as uncached, then pages should be dropped when + * writeback completes. Do that now. + */ + if (folio_test_uncached(folio)) { + folio_lock(folio); + if (invalidate_complete_folio2(folio->mapping, folio, 0)) + folio_clear_uncached(folio); + folio_unlock(folio); + + } folio_put(folio); } EXPORT_SYMBOL(folio_end_writeback); -- 2.45.2