Re: questions on s_files and open.c/filp_open

[Peter J. Braam]

Alexander Viro wrote:

> 
> 6) unions in superblocks (and inodes) are nasty. Use separately-allocated
> private parts of either and keep pointer to them in ->u.generic_sbp and
> ->u.generic_ip, resp. It's less critical for superblocks, but for inodes
> it is pretty serious.

Is it expensive to allocate that data whenever an inode is brought into
memory?

Some commercial Unices did this and then backed out in view of the cost.


- Peter -