From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH 2/2] ceph: enable/disable dentry complete flags via mount
 option
Date: Wed, 11 Jan 2012 14:00:01 -0500
Message-ID: <20120111190001.GB29582@infradead.org>
References: <1326307602-16284-1-git-send-email-sage@newdream.net>
 <1326307602-16284-3-git-send-email-sage@newdream.net>
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Cc: viro@ZenIV.linux.org.uk, hch@infradead.org,
	ceph-devel@vger.kernel.org, linux-fsdevel@vger.kernel.org
To: Sage Weil <sage@newdream.net>
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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.