ovl: handle ENOENT on index lookup
Treat ENOENT from index entry lookup the same way as treating a returned negative dentry. Apparently, either could be returned if file is not found, depending on the underlying file system. Fixes: 359f392c ("ovl: lookup index entry for copy up origin") Cc: <stable@vger.kernel.org> # v4.13 Signed-off-by: NAmir Goldstein <amir73il@gmail.com>
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