Hi, I'm working on a project to emulate hostids in non-global zones. Part of my solution touches uts/common/fs/zfs/spa.c and spa_config.c where the hostid stored in a storage pool is compared to the local system's hostid (spa.c:1162-1182) and the local system's hostid is stored in a storage pool's configuration (spa_config.c:352-356). I have two questions about this code:
(1) Why does 0 signify an invalid or nonexistent hostid? Why not FFFFFFFF, which userland understands to be an invalid hostid (see gethostid() in libc/port/gen/gethostid.c)? (2) Why is is that if the local system's hostid is invalid (0), then the system can import zpools accessed by other hosts? (That's what the code block in spa.c does.) Shouldn't it rather be the case that if the local system's hostid is invalid, then the system shouldn't be able to import any zpools? Thank you for your time. Regards, Jordan -- /* * Jordan Vaughan * Solaris Kernel Developer * Jordan.Vaughan at Sun.com * blogs.sun.com/lunchware */
