[PATCHv2 25/28] truncate: handle file thp
From: Kirill A. Shutemov <hidden>
Date: 2016-02-11 14:24:48
Also in:
lkml
Subsystem:
memory management, page cache, the rest · Maintainers:
Andrew Morton, Matthew Wilcox, Jan Kara, Linus Torvalds
For shmem/tmpfs we only need to tweak truncate_inode_page() and invalidate_mapping_pages(). Signed-off-by: Kirill A. Shutemov <redacted> --- mm/truncate.c | 22 ++++++++++++++++++++-- 1 file changed, 20 insertions(+), 2 deletions(-)
diff --git a/mm/truncate.c b/mm/truncate.c
index 7598b552ae03..40d3730a8e62 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c@@ -157,10 +157,14 @@ 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_CACHE_SIZE; if (page_mapped(page)) { unmap_mapping_range(mapping, (loff_t)page->index << PAGE_CACHE_SHIFT, - PAGE_CACHE_SIZE, 0); + holelen, 0); } return truncate_complete_page(mapping, page); }
@@ -489,7 +493,21 @@ 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); /*
--
2.7.0
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