ovl: fix may_write_real() for overlayfs directories
Overlayfs directory file_inode() is the overlay inode whether the real inode is upper or lower. This fixes a regression in xfstest generic/158. Fixes: 7c6893e3 ("ovl: don't allow writing ioctl on lower layer") Signed-off-by: NAmir Goldstein <amir73il@gmail.com> Signed-off-by: NMiklos Szeredi <mszeredi@redhat.com>
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