linux-kernel - [PATCH] mm, dax: VMA with vm_ops->pfn_mkwrite wants to be write-notified

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Date:	Tue,  1 Sep 2015 13:22:41 +0300
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>
Cc:	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-nvdimm@...ts.01.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Yigal Korman <yigal@...xistor.com>,
	Boaz Harrosh <boaz@...xistor.com>, Jan Kara <jack@...e.cz>,
	Dave Chinner <david@...morbit.com>
Subject: [PATCH] mm, dax: VMA with vm_ops->pfn_mkwrite wants to be write-notified

For VM_PFNMAP and VM_MIXEDMAP we use vm_ops->pfn_mkwrite instead of
vm_ops->page_mkwrite to notify abort write access. This means we want
vma->vm_page_prot to be write-protected if the VMA provides this vm_ops.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Cc: Yigal Korman <yigal@...xistor.com>
Cc: Boaz Harrosh <boaz@...xistor.com>
Cc: Matthew Wilcox <matthew.r.wilcox@...el.com>
Cc: Jan Kara <jack@...e.cz>
Cc: Dave Chinner <david@...morbit.com>
---
 mm/mmap.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index df6d5f07035b..3f78bceefe5a 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1498,7 +1498,8 @@ int vma_wants_writenotify(struct vm_area_struct *vma)
 		return 0;
 
 	/* The backer wishes to know when pages are first written to? */
-	if (vma->vm_ops && vma->vm_ops->page_mkwrite)
+	if (vma->vm_ops &&
+			(vma->vm_ops->page_mkwrite || vma->vm_ops->pfn_mkwrite))
 		return 1;
 
 	/* The open routine did something to the protections that pgprot_modify
-- 
2.5.0

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