From: Luis Chamberlain <mcgrof@xxxxxxxxxx>
page cache is mapping min_folio_order aligned. Use mapping min_folio_order
to align the start_byte and end_byte in filemap_range_has_page().
Signed-off-by: Luis Chamberlain <mcgrof@xxxxxxxxxx>
---
mm/filemap.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/mm/filemap.c b/mm/filemap.c
index 2c47729dc8b0..4dee24b5b61c 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -477,9 +477,12 @@ EXPORT_SYMBOL(filemap_flush);
bool filemap_range_has_page(struct address_space *mapping,
loff_t start_byte, loff_t end_byte)
{
+ unsigned int min_order = mapping_min_folio_order(mapping);
+ unsigned int nrpages = 1UL << min_order;
+ pgoff_t index = round_down(start_byte >> PAGE_SHIFT, nrpages);
struct folio *folio;
- XA_STATE(xas, &mapping->i_pages, start_byte >> PAGE_SHIFT);
- pgoff_t max = end_byte >> PAGE_SHIFT;
+ XA_STATE(xas, &mapping->i_pages, index);
+ pgoff_t max = round_down(end_byte >> PAGE_SHIFT, nrpages);
if (end_byte < start_byte)
return false;
--
2.40.1
