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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 | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/mm/filemap.c b/mm/filemap.c index 3d0614ea5f59..40debe742abe 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -1600,6 +1600,27 @@ int folio_wait_private_2_killable(struct folio *foli= o) } EXPORT_SYMBOL(folio_wait_private_2_killable); =20 +/* + * If folio was marked as uncached, then pages should be dropped when writ= eback + * completes. Do that now. If we fail, it's likely because of a big folio - + * just reset uncached for that case and latter completions should invalid= ate. + */ +static void folio_end_uncached(struct folio *folio) +{ + /* + * Hitting !in_task() should not happen off RWF_UNCACHED writeback, but + * can happen if normal writeback just happens to find dirty folios + * that were created as part of uncached writeback, and that writeback + * would otherwise not need non-IRQ handling. Just skip the + * invalidation in that case. + */ + if (in_task() && folio_trylock(folio)) { + if (folio->mapping) + folio_unmap_invalidate(folio->mapping, folio, 0); + folio_unlock(folio); + } +} + /** * folio_end_writeback - End writeback against a folio. * @folio: The folio. @@ -1610,6 +1631,8 @@ EXPORT_SYMBOL(folio_wait_private_2_killable); */ void folio_end_writeback(struct folio *folio) { + bool folio_uncached =3D false; + VM_BUG_ON_FOLIO(!folio_test_writeback(folio), folio); =20 /* @@ -1631,9 +1654,14 @@ void folio_end_writeback(struct folio *folio) * reused before the folio_wake_bit(). */ folio_get(folio); + if (folio_test_uncached(folio) && folio_test_clear_uncached(folio)) + folio_uncached =3D true; if (__folio_end_writeback(folio)) folio_wake_bit(folio, PG_writeback); acct_reclaim_writeback(folio); + + if (folio_uncached) + folio_end_uncached(folio); folio_put(folio); } EXPORT_SYMBOL(folio_end_writeback); --=20 2.45.2