[RFC PATCH v2 5/8] ovl: mark overlayfs' inode dirty on shared writable mmap

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Overlayfs cannot be notified when mmapped area gets dirty,
so we need to proactively mark inode dirty in ->mmap operation.

Signed-off-by: Chengguang Xu <cgxu519@xxxxxxxxxxxx>
---
 fs/overlayfs/file.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/overlayfs/file.c b/fs/overlayfs/file.c
index efccb7c1f9bc..cd6fcdfd81a9 100644
--- a/fs/overlayfs/file.c
+++ b/fs/overlayfs/file.c
@@ -486,6 +486,10 @@ static int ovl_mmap(struct file *file, struct vm_area_struct *vma)
 		/* Drop reference count from new vm_file value */
 		fput(realfile);
 	} else {
+		if (vma->vm_flags & (VM_SHARED|VM_MAYSHARE) &&
+		    vma->vm_flags & (VM_WRITE|VM_MAYWRITE))
+			ovl_mark_inode_dirty(file_inode(file));
+
 		/* Drop reference count from previous vm_file value */
 		fput(file);
 	}
-- 
2.26.2






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