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Dear folks,

On Tue, Jan 10, 2006 at 12:53:12AM +0100, Reinoud Zandijk wrote:
> for a long time but then it gets ugly. For unknown reasons buf's containing 
> directory information are then constantly recycled and buffers just touched 
> a transaction before seem to be lost again and directories have to be 
> reread and reread and reread over and over again.

now that was a silly bug of me. I brelse()'d directory buf's with B_AGE. 
Who ever though of naming B_AGE the flag that would mean pushing the buffer 
on the freelist.... *sigh* No wonder that when buffers got tight they got 
recycled first. FFS offcource did push stuff on the LRU list and the 
freelist gets eaten first :-/

Revisiting my UDF directory buffer reading code and figuring out how to 
make it smarter by reading ahead directory contents and such i wondered if 
UVM would do a better job in handling the buffers. A small patch to genfs 
did the trick and i have to say it works like a charm complete with 
directory read-ahead etc.

Since its doesn't change existing behaviour and was only added as a 
`sanity' check for existing usage, i'd like to commit the genfs patch 
preferably after Takashi posts his genfs patch. Its only a replacement of 
(vp->v_type == VREG) by (vp->v_type == VREG || bp->b_type == VDIR).

Cheers,
Reinoud


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