Re: Eureka! (was Re: UTF-8 and case-insensitivity)

[viro]

On Thu, Feb 19, 2004 at 11:48:50AM -0800, Linus Torvalds wrote:
> The VFS rule is:
>  - all new dentries start off with the two magic bits clear
>  - whenever we shrink a dentry, we clear the two magic bits in the parent
> 
> and that is _all_ the VFS layer ever does. Even Al won't find this 
> obnoxious (yeah, we might clear the bits after a timeout on things that 
> need re-validation, but that's in the noise).
 
> Notice what the above does? After the above loop, bit two will be set IFF 
> the dentry cache now contains every single name in the directory. 
> Otherwise it will be clear. Bit two will basically be a "dcache complete" 
> bit.

What about dentry getting dropped in the middle of that loop _and_
another task setting the first bit again before the loop ends?
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