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The next libblkid v2.37 is going to support session offsets for multi-session CD/DVDs. This feature is implemented by "hint offsets". These offsets are optional and prober specific (e.g., iso, udf, ...). For this purpose, the library provides a new function blkid_probe_set_hint(), and blkid(8) provides a new command-line option --hint <name>=<offset>. For CD/DVD, the offset name is "session_offset". The difference between classic --offset and the new --hint is that --offset is very restrictive and defines the probing area and the rest of the device is invisible to the library. The new --hint works like a suggestion, it provides a hint where the user assumes the filesystem, but the rest of the device is still readable for the library (for example, to get some additional superblock information etc.). If the --hint is without a value then it defaults to zero. The option --hint implementation in udev-builtin-blkid.c is backwardly compatible. If compiled against old libblkid, then the option is used in the same way as --offset. Addresses: https://github.com/karelzak/util-linux/issues/1161 Addresses: https://github.com/systemd/systemd/pull/17424