Re: [PATCH 2/2] ceph: enable/disable dentry complete flags via mount option

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> +  dcache
> +        Use the dcache contents to perform negative lookups and
> +        readdir when the client has the entire directory contents in
> +        its cache.  (This does not change correctness; the client uses
> +        cached metadata only when a lease or capability ensures it is
> +        valid.)
> +
> +  nodcache
> +        Do not use the dcache as above.
>  
> +  noasyncreaddir
> +	Do not use the dcache as above for readdir.

None of thie explains why you'd ever want to turn the flag off.

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