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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>
hifive-unleashed-5.1
Kirill A. Shutemov 2016-07-26 15:26:07 -07:00 committed by Linus Torvalds
parent 83929372f6
commit fc127da085
1 changed files with 23 additions and 5 deletions
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28
mm/truncate.c
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@ -155,10 +155,14 @@ invalidate_complete_page(struct address_space *mapping, struct page *page)
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 @@ void truncate_inode_pages_range(struct address_space *mapping,
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 @@ void truncate_inode_pages_range(struct address_space *mapping,
}
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 @@ unsigned long invalidate_mapping_pages(struct address_space *mapping,
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 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
}
lock_page(page);
WARN_ON(page->index != index);
WARN_ON(page_to_pgoff(page) != index);
if (page->mapping != mapping) {
unlock_page(page);
continue;