"Richard L. Hamilton" <rlha...@smart.net> wrote:
> Typically on most filesystems, the inode number of the root
> directory of the filesystem is 2, 0 being unused and 1 historically
> once invisible and used for bad blocks (no longer done, but kept
> reserved so as not to invalidate assumptions implicit in ufsdump tapes).
>
> However, my observation seems to be (at least back at snv_97), the
> inode number of ZFS filesystem root directories (including at the
> top level of a spool) is 3, not 2.
This was traditionally the lost+found inode number.
> If there's any POSIX/SUS requirement for the traditional number 2,
> I haven't found it. So maybe there's no reason founded in official
> standards for keeping it the same. But there are bound to be programs
> that make what was with other filesystems a safe assumption.
POSIX only requires that ino(1) == ino(..) if you have a root directory.
Jörg
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