On Sat, Oct 19, 2013 at 11:53 AM, Tom Lane <t...@sss.pgh.pa.us> wrote:

> Soroosh Sardari <soroosh.sard...@gmail.com> writes:
> > I need to get a Relation instance but I have only a RelFileNode!
> Why do you think you need to do that?  Such a lookup is inherently the
> wrong thing, because relations' relfilenode values are not fixed (unless
> you have a lock on the relation, which presumably you don't).
>                         regards, tom lane

I know, it's against PG abstraction.
In PG we don't need to know anything about relation in the smgr level. but
in my project i want to encrypt
all pages of a particular relation and decrypt it when those pages are
fetching back to buffer.

This behavior depends on some relation properties. So in smgropen I must
get some knowledge about the relation and all of i have is RelFileNode.

I can not see the pg_class for the relation oid, because smgropen may
called before insertion in pg_class.


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