[PATCHv6 21/37] truncate: make invalidate_inode_pages2_range() aware about huge pages

Kirill A. Shutemov
2017-01-26T11:58:03Z

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 | 23 ++++++++++++++---------
1 file changed, 14 insertions(+), 9 deletions(-)

diff --git a/mm/truncate.c b/mm/truncate.c
index 81e1a13acb63..ddb615e6a193 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -703,27 +703,32 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
continue;
}
wait_on_page_writeback(page);
+
if (page_mapped(page)) {
+ loff_t begin, len;
+
+ begin = index << PAGE_SHIFT;
if (!did_range_unmap) {
/*
* Zap the rest of the file in one hit.
*/
+ len = (loff_t)(1 + end - 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))
@@ -734,9 +739,9 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
unlock_page(page);
}
pagevec_remove_exceptionals(&pvec);
+ index += pvec.nr ? hpage_nr_pages(pvec.pages[pvec.nr - 1]) : 1;
pagevec_release(&pvec);
cond_resched();
- index++;
}
cleancache_invalidate_inode(mapping);
return ret;