The patch titled
Subject: page-cache-store-only-head-pages-in-i_pages-fix-fix
has been added to the -mm tree. Its filename is
page-cache-store-only-head-pages-in-i_pages-fix-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/page-cache-store-only-head-pages-in-i_pages-fix-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/page-cache-store-only-head-pages-in-i_pages-fix-fix.patch
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------------------------------------------------------
From: "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx>
Subject: page-cache-store-only-head-pages-in-i_pages-fix-fix
hugetlb stores pages in page cache differently.
Link: http://lkml.kernel.org/r/20190404134553.vuvhgmghlkiw2hgl@kshutemo-mobl1
Tested-by: Qian Cai <cai@xxxxxx>
Cc: William Kucharski <william.kucharski@xxxxxxxxxx>
Cc: Song Liu <songliubraving@xxxxxx>
Cc: Song Liu <liu.song.a23@xxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/pagemap.h | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
--- a/include/linux/pagemap.h~page-cache-store-only-head-pages-in-i_pages-fix-fix
+++ a/include/linux/pagemap.h
@@ -335,12 +335,15 @@ static inline struct page *grab_cache_pa
static inline struct page *find_subpage(struct page *page, pgoff_t offset)
{
- unsigned long index = page_index(page);
+ unsigned long mask;
+
+ if (PageHuge(page))
+ return page;
VM_BUG_ON_PAGE(PageTail(page), page);
- VM_BUG_ON_PAGE(index > offset, page);
- VM_BUG_ON_PAGE(index + (1 << compound_order(page)) <= offset, page);
- return page - index + offset;
+
+ mask = (1UL << compound_order(page)) - 1;
+ return page + (offset & mask);
}
struct page *find_get_entry(struct address_space *mapping, pgoff_t offset);
_
Patches currently in -mm which might be from kirill@xxxxxxxxxxxxx are
page-cache-store-only-head-pages-in-i_pages-fix-fix.patch
