[PATCHv3 27/41] truncate: make invalidate_inode_pages2_range() aware about huge pages

Kirill A. Shutemov
2016-09-15T11:55:09Z

For huge pages we need to unmap whole range covered by the huge page.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
mm/truncate.c | 27 +++++++++++++++++++--------
1 file changed, 19 insertions(+), 8 deletions(-)

diff --git a/mm/truncate.c b/mm/truncate.c
index 9c339e6255f2..6a445278aaaf 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -708,27 +708,34 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
continue;
}
wait_on_page_writeback(page);
+ page = compound_head(page);
+
if (page_mapped(page)) {
+ loff_t begin, len;
+
+ begin = page->index << PAGE_SHIFT;
+
if (!did_range_unmap) {
/*
* Zap the rest of the file in one hit.
*/
+ len = (loff_t)(1 + end - page->index) <<
+ PAGE_SHIFT;
+ if (len < hpage_size(page))
+ len = hpage_size(page);
unmap_mapping_range(mapping,
- (loff_t)index << PAGE_SHIFT,
- (loff_t)(1 + end - index)
- << PAGE_SHIFT,
- 0);
+ begin, len, 0);
did_range_unmap = 1;
} else {
/*
* Just zap this page
*/
- unmap_mapping_range(mapping,
- (loff_t)index << PAGE_SHIFT,
- PAGE_SIZE, 0);
+ len = hpage_size(page);
+ unmap_mapping_range(mapping, begin,
+ len, 0 );
}
}
- BUG_ON(page_mapped(page));
+ VM_BUG_ON_PAGE(page_mapped(page), page);
ret2 = do_launder_page(mapping, page);
if (ret2 == 0) {
if (!invalidate_complete_page2(mapping, page))
@@ -737,6 +744,10 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
if (ret2 < 0)
ret = ret2;
unlock_page(page);
+ if (PageTransHuge(page)) {
+ index = page->index + HPAGE_PMD_NR - 1;
+ break;
+ }
}
pagevec_remove_exceptionals(&pvec);
pagevec_release(&pvec);