---- 在 星期日, 2020-11-08 22:03:03 Chengguang Xu <cgxu519@xxxxxxxxxxxx> 撰写 ----
> 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 | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/fs/overlayfs/file.c b/fs/overlayfs/file.c
> index efccb7c1f9bc..662252047fff 100644
> --- a/fs/overlayfs/file.c
> +++ b/fs/overlayfs/file.c
> @@ -486,6 +486,8 @@ 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))
Maybe it's better to mark dirty only having upper inode.
> + ovl_mark_inode_dirty(file_inode(file));
> /* Drop reference count from previous vm_file value */
> fput(file);
> }
> --
> 2.26.2
>
>
>
