Messages in this thread | | | Date | Fri, 2 Jul 1999 18:42:38 -0400 (EDT) | From | "Albert D. Cahalan" <> | Subject | Re: [security]: kernel ioctl()'s [2] |
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Chris Evans writes:
> Oh yeah. So, question, what's the ext2_i.i_version used by? > I suppose I withdraw my objection to letting users set it!
The NFS server is supposed to use i_version. Don't think of i_version as a file version like VMS has. The BSD name, i_gen, more accurately indicates that this is a generation number.
The filesystem should change i_gen when and only when an inode is allocated. Random numbers are OK, as are serial numbers. Perhaps use 16 bits of randomness and 16 of serial number?
Without i_gen, newly created files could be confused with old files that were just deleted. This is because the NFS cookie could end up being the same. The addition of i_gen prevents duplicate NFS cookie generation.
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