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[PATCHv1, RFC 27/33] ext4: handle huge pages in ext4_page_mkwrite()

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  [PATCHv1, RFC 27/33] ext4: handle huge pages in ext4_page_mkwrite() "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2016-07-26 02:40 +0200

#1450273 — [PATCHv1, RFC 27/33] ext4: handle huge pages in ext4_page_mkwrite()

Trivial: remove assumption on page size.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
 fs/ext4/inode.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index f585f9160a96..45822097d8c2 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -5646,7 +5646,7 @@ static int ext4_bh_unmapped(handle_t *handle, struct buffer_head *bh)
 
 int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
 {
-	struct page *page = vmf->page;
+	struct page *page = compound_head(vmf->page);
 	loff_t size;
 	unsigned long len;
 	int ret;
@@ -5682,10 +5682,10 @@ int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
 		goto out;
 	}
 
-	if (page->index == size >> PAGE_SHIFT)
-		len = size & ~PAGE_MASK;
-	else
-		len = PAGE_SIZE;
+	len = hpage_size(page);
+	if (page->index + hpage_nr_pages(page) - 1 == size >> PAGE_SHIFT)
+		len = size & ~hpage_mask(page);
+
 	/*
 	 * Return if we have all the buffers mapped. This avoids the need to do
 	 * journal_start/journal_stop which can block and take a long time
-- 
2.8.1

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