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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/20161123093053.mjbnvn5zwxw5e6lk@black.fi.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reported-by: Doug Nelson <doug.nelson@intel.com>
Tested-by: Doug Nelson <doug.nelson@intel.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: <stable@vger.kernel.org>	[4.8+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kirill A. Shutemov
2016-11-30 15:54:19 -08:00
committed by Linus Torvalds
parent 828347f8f9
commit 5cbc198ae0
2 changed files with 19 additions and 10 deletions
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21
include/linux/pagemap.h
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@@ -374,16 +374,13 @@ static inline struct page *read_mapping_page(struct address_space *mapping,
}
/*
* Get the offset in PAGE_SIZE.
* (TODO: hugepage should have ->index in PAGE_SIZE)
* Get index of the page with in radix-tree
* (TODO: remove once hugetlb pages will have ->index in PAGE_SIZE)
*/
static inline pgoff_t page_to_pgoff(struct page *page)
static inline pgoff_t page_to_index(struct page *page)
{
pgoff_t pgoff;
if (unlikely(PageHeadHuge(page)))
return page->index << compound_order(page);
if (likely(!PageTransTail(page)))
return page->index;
@@ -396,6 +393,18 @@ static inline pgoff_t page_to_pgoff(struct page *page)
return pgoff;
}
/*
* Get the offset in PAGE_SIZE.
* (TODO: hugepage should have ->index in PAGE_SIZE)
*/
static inline pgoff_t page_to_pgoff(struct page *page)
{
if (unlikely(PageHeadHuge(page)))
return page->index << compound_order(page);
return page_to_index(page);
}
/*
* Return byte-offset into filesystem object for page.
*/