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Date:	Sat, 14 May 2016 22:39:18 +0200
From:	Michal Nazarewicz <>
To:	Alan Stern <>,
	Felipe Balbi <>
Cc:	"Du\, Changbin" <>,
	Al Viro <>,
	"gregkh\" <>,
	"rui.silva\" <>,
	"k.opasiak\" <>,
	"lars\" <>,
	"linux-usb\" <>,
	"linux-kernel\" <>
Subject: Re: [PATCH] usb: gadget: f_fs: report error if excess data received

On Fri, May 13 2016, Alan Stern wrote:
> The point is that you don't know whether the host sent more data than
> expected.  All you know is that the host sent more data than the user
> asked the kernel for -- but maybe the user didn't ask for all the data
> that he expected.  Maybe the user wanted to retrieve the full set of
> data using two read() system calls.

I was wondering about that for a while actually.  So far, f_fs’ model
was: one read, one request.  Splitting requests would certainly be
possible, but is that what f_fs’ users would expect to happen if host
rounds the request up?

Best regards
ミハウ “𝓶𝓲𝓷𝓪86” ナザレヴイツ
«If at first you don’t succeed, give up skydiving»

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