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mm: fix false-positive WARN_ON() in truncate/invalidate for hugetlb

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Hugetlb pages have ->index in size of the huge pages (PMD_SIZE or
PUD_SIZE), not in PAGE_SIZE as other types of pages.  This means we
cannot user page_to_pgoff() to check whether we've got the right page
for the radix-tree index.

Let's introduce page_to_index() which would return radix-tree index for
given page.

We will be able to get rid of this once hugetlb will be switched to
multi-order entries.

Fixes: fc127da085 ("truncate: handle file thp")
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Kirill A. Shutemov <[email protected]>
Reported-by: Doug Nelson <[email protected]>
Tested-by: Doug Nelson <[email protected]>
Reviewed-by: Naoya Horiguchi <[email protected]>
Cc: <[email protected]>	[4.8+]
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Kirill A. Shutemov 2016-11-30 15:54:19 -08:00 • committed by Linus Torvalds
commit 5cbc198ae0
2 changed files with 19 additions and 10 deletions
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8
mm/truncate.c
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@ -283,7 +283,7 @@ void truncate_inode_pages_range(struct address_space *mapping,
if (!trylock_page(page))
continue;
WARN_ON(page_to_pgoff(page) != index);
WARN_ON(page_to_index(page) != index);
if (PageWriteback(page)) {
unlock_page(page);
continue;
@ -371,7 +371,7 @@ void truncate_inode_pages_range(struct address_space *mapping,
}
lock_page(page);
WARN_ON(page_to_pgoff(page) != index);
WARN_ON(page_to_index(page) != index);
wait_on_page_writeback(page);
truncate_inode_page(mapping, page);
unlock_page(page);
@ -492,7 +492,7 @@ unsigned long invalidate_mapping_pages(struct address_space *mapping,
if (!trylock_page(page))
continue;
WARN_ON(page_to_pgoff(page) != index);
WARN_ON(page_to_index(page) != index);
/* Middle of THP: skip */
if (PageTransTail(page)) {
@ -612,7 +612,7 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
}
lock_page(page);
WARN_ON(page_to_pgoff(page) != index);
WARN_ON(page_to_index(page) != index);
if (page->mapping != mapping) {
unlock_page(page);
continue;