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FileDirectoryInformation info class to avoid problems with incomplete filesystem implementations. Fix comments accordingly. * fhandler_disk_file.cc (fhandler_disk_file::readdir_helper): Set fname->Length to 0 in error case to avoid potential crash in debug output. (fhandler_disk_file::readdir): Try to speed up the working default case. Check for STATUS_INVALID_NETWORK_RESPONSE as potential status value returned by filesystems not implementing FileIdBothDirectoryInformation. * ntdll.h (STATUS_INVALID_NETWORK_RESPONSE): Define. (FILE_BOTH_DIRECTORY_INFORMATION): Rename to official name. * path.cc (symlink_info::check): Don't request FILE_READ_EA access, it's not required for NFS. Try to speed up the working default case. Check for STATUS_INVALID_NETWORK_RESPONSE as potential status value returned by filesystems not supporting non-NULL EA parameters. Fix the way fs.update is called. Improve debug output.
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