Oh, that EISDIR must be from opening with write permission in netfs_attempt_lookup. I made it check for EROFS or EISDIR as it does for EACCES. If there are other possible errors for an O_RDWR open that aren't possible for a O_RDONLY open, we should check for those as well. Or we could make it just ignore any error except for some common cases like ENOENT in the first two tries and only report the error on the third. But I'd rather not repeat the calls for most errors if we can avoid it.
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