Messages in this thread Patch in this message | | | Date | Tue, 15 Nov 2022 04:09:06 +0000 | From | Matthew Wilcox <> | Subject | Re: [RFC PATCH v2] mm, netfs, fscache: Stop read optimisation when folio removed from pagecache |
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On Mon, Nov 14, 2022 at 04:02:20PM +0000, David Howells wrote: > +++ b/mm/filemap.c > @@ -3941,6 +3941,10 @@ bool filemap_release_folio(struct folio *folio, gfp_t gfp) > struct address_space * const mapping = folio->mapping; > > BUG_ON(!folio_test_locked(folio)); > + if ((!mapping || !mapping_release_always(mapping)) > + && !folio_test_private(folio) && > + !folio_test_private_2(folio)) > + return true;
Why do you need to test 'mapping' here? Also this is the most inconsistent style ...
if ((!mapping || !mapping_release_always(mapping)) && !folio_test_private(folio) && !folio_test_private_2(folio))
works fine, but if you insist on splitting over three lines, then:
if ((!mapping || !mapping_release_always(mapping)) && !folio_test_private(folio) && !folio_test_private_2(folio))
> @@ -276,7 +275,7 @@ static long mapping_evict_folio(struct address_space *mapping, > if (folio_ref_count(folio) > > folio_nr_pages(folio) + folio_has_private(folio) + 1)
I think this line is incorrect, right? You don't increment the folio refcount just because the folio has private2 set, do you?
> return 0; > - if (folio_has_private(folio) && !filemap_release_folio(folio, 0)) > + if (!filemap_release_folio(folio, 0)) > return 0; > > return remove_mapping(mapping, folio);
Can we get rid of folio_has_private() / page_has_private() now?
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