linux-kernel - Re: [PATCH] nfs-util: Add cache_flush in mountd UMNT procedure.

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Date:	Sat, 28 Jul 2012 13:52:10 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	"J. Bruce Fields" <bfields@...ldses.org>
Cc:	SteveD@...hat.com, Trond.Myklebust@...app.com,
	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	Vivek Trivedi <vtrivedi018@...il.com>
Subject: Re: [PATCH] nfs-util: Add cache_flush in mountd UMNT procedure.

>> Hi James.
>> I have a question.
>> If we found the method to notify nfs when unplugging device,
>
Hi James.
> What's that?
I need to check more...

>
>> Can nfsd
>> flush only entry of usb mount ?
>
> Hm, I don't think there's anything that does that now.  But I think if
> you look it up and set the cache item's expiry_time to the current unix
> time in seconds, that'd be at least a start.
>
> Come to think of it you should actually be able to do that from
> userspace if you want: just write a negative cache entry for that
> export.
>
> However you do this there may still be some brief delay while some
> thread finishes processing an rpc using the entry; I don't know what to
> do about that.  It's unlikely in your case (where clients have unmounted
> first).
Okay, I will look for more.
Thanks for your reply.
>
> --b.
>
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