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mm/memory: fix folio_set_dirty() vs. folio_mark_dirty() in zap_pte_range()

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The correct folio replacement for "set_page_dirty()" is
"folio_mark_dirty()", not "folio_set_dirty()".  Using the latter won't
properly inform the FS using the dirty_folio() callback.

This has been found by code inspection, but likely this can result in some
real trouble when zapping dirty PTEs that point at clean pagecache folios.

Yuezhang Mo said: "Without this fix, testing the latest exfat with
xfstests, test cases generic/029 and generic/030 will fail."

Link: https://lkml.kernel.org/r/20240122171751.272074-1-david@redhat.com
Fixes: c46265030b ("mm/memory: page_remove_rmap() -> folio_remove_rmap_pte()")
Signed-off-by: David Hildenbrand <david@redhat.com>
Reported-by: Ryan Roberts <ryan.roberts@arm.com>
Closes: https://lkml.kernel.org/r/2445cedb-61fb-422c-8bfb-caf0a2beed62@arm.com
Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Yuezhang Mo <Yuezhang.Mo@sony.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
David Hildenbrand 2024-01-22 18:17:51 +01:00 committed by Andrew Morton
parent db44c658f7
commit e4e3df290f
1 changed files with 1 additions and 1 deletions
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mm/memory.c
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@ -1464,7 +1464,7 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb,
delay_rmap = 0; delay_rmap = 0;
if (!folio_test_anon(folio)) { if (!folio_test_anon(folio)) {
if (pte_dirty(ptent)) { if (pte_dirty(ptent)) {
folio_set_dirty(folio); folio_mark_dirty(folio);
if (tlb_delay_rmap(tlb)) { if (tlb_delay_rmap(tlb)) {
delay_rmap = 1; delay_rmap = 1;
force_flush = 1; force_flush = 1;