truncate: handle file thp
For shmem/tmpfs we only need to tweak truncate_inode_page() and
invalidate_mapping_pages().
truncate_inode_pages_range() and invalidate_inode_pages2_range() are
adjusted to use page_to_pgoff().
Link: http://lkml.kernel.org/r/1466021202-61880-26-git-send-email-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/truncate.c b/mm/truncate.c
index 4064f8f..a01cce4 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -155,10 +155,14 @@
int truncate_inode_page(struct address_space *mapping, struct page *page)
{
+ loff_t holelen;
+ VM_BUG_ON_PAGE(PageTail(page), page);
+
+ holelen = PageTransHuge(page) ? HPAGE_PMD_SIZE : PAGE_SIZE;
if (page_mapped(page)) {
unmap_mapping_range(mapping,
(loff_t)page->index << PAGE_SHIFT,
- PAGE_SIZE, 0);
+ holelen, 0);
}
return truncate_complete_page(mapping, page);
}
@@ -279,7 +283,7 @@
if (!trylock_page(page))
continue;
- WARN_ON(page->index != index);
+ WARN_ON(page_to_pgoff(page) != index);
if (PageWriteback(page)) {
unlock_page(page);
continue;
@@ -367,7 +371,7 @@
}
lock_page(page);
- WARN_ON(page->index != index);
+ WARN_ON(page_to_pgoff(page) != index);
wait_on_page_writeback(page);
truncate_inode_page(mapping, page);
unlock_page(page);
@@ -487,7 +491,21 @@
if (!trylock_page(page))
continue;
- WARN_ON(page->index != index);
+
+ WARN_ON(page_to_pgoff(page) != index);
+
+ /* Middle of THP: skip */
+ if (PageTransTail(page)) {
+ unlock_page(page);
+ continue;
+ } else if (PageTransHuge(page)) {
+ index += HPAGE_PMD_NR - 1;
+ i += HPAGE_PMD_NR - 1;
+ /* 'end' is in the middle of THP */
+ if (index == round_down(end, HPAGE_PMD_NR))
+ continue;
+ }
+
ret = invalidate_inode_page(page);
unlock_page(page);
/*
@@ -594,7 +612,7 @@
}
lock_page(page);
- WARN_ON(page->index != index);
+ WARN_ON(page_to_pgoff(page) != index);
if (page->mapping != mapping) {
unlock_page(page);
continue;