Re: Extra per-inode data

Matti Aarnio (matti.aarnio@tele.fi)
Thu, 29 Jan 1998 14:02:11 +0000 (/etc/localtime)

> Hi,
>
> I'm now playing with some filesystem capable of >4G files and I need to
> store lot of data (approx. 1K) per inode, so I decided to use the
> inode->u.generic_ip field to point to my local data instead of putting
> it directly to the inode structure.

Yes, the field can be used, presuming you are aware that the "u."
there means that it is a UNION of possibilities, each excluding
the others away.

> But it seems that there is no way to free such data when the inode gets
> flushed out of the inode cache (it can be still reused after
> super_ops->put_inode gets called).
>
> The only solution I see is to introduce a new super_op called from
> clear_inode to free such auxiliary data (see the patch below). Does
> anybody have a better idea?

Nope, this one is rather elegant on its own.

>
> Have a nice fortnight
> --
> Martin `MJ' Mares <mj@ucw.cz> http://atrey.karlin.mff.cuni.cz/~mj/
> Faculty of Math and Physics, Charles University, Prague, Czech Rep., Earth

/Matti Aarnio <matti.aarnio@tele.fi>