Re: [PATCH 0/4] Use 64-bit inode numbers internally in the kernel

From: Al Viro
Date: Tue Aug 15 2006 - 05:11:36 EST

On Tue, Aug 15, 2006 at 09:21:53AM +0100, David Howells wrote:
> Josh Boyer <jwboyer@xxxxxxxxx> wrote:
> > Out of curiosity, is there a performance hit for 32-bit systems? Have
> > you done any minimal benchmarks to see?
> Yes, I'm sure there is, but we're talking performance vs correctness.

ITYM performance vs. slightly different patch. Let me put all pieces
in one place:
* kstat gets u64 ino
* filesystems that want to report 64bit st_ino do it in their
->getattr(); the rest is unchanged.
* ino_t is left as-is
* filldir() callbacks get u64 ino in arguments. Filesystem may
pass 64bit value if it cares to; otherwise it's left unchanged.
* filesystem that wants unusual search key can use iget5() (as
it can do right now)
* filesystem that wants to use the values it'd put into st_ino in
its printks should use appropriate format
* any printk in generic code that happens to use i_ino should
be hunted down and shot for utter uselessness for too many filesystems
(not sure if we actually _have_ any such printk these days).
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