linux-kernel - Re: [RESEND][BUG][PATCH]-rc: USB: yurex: add .llseek fop to file

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Date:	Sat, 27 Nov 2010 12:46:47 +0900
From:	Tomoki Sekiyama <tomoki.sekiyama@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Greg KH <gregkh@...e.de>, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org
Subject: Re: [RESEND][BUG][PATCH]-rc: USB: yurex: add .llseek fop to file_operations

2010/11/27 Arnd Bergmann <arnd@...db.de>:
> On Thursday 25 November 2010 18:16:13 Greg KH wrote:
>> On Fri, Nov 26, 2010 at 01:11:05AM +0900, Tomoki Sekiyama wrote:
>> > Hi Greg-KH,
>> > Sorry for resending this; To: was not enough.
>> >
>> > https://bugzilla.kernel.org/show_bug.cgi?id=23512
>> >
>> > Default llseek operation behavior was changed by the patch named
>> > "vfs: make no_llseek the default" after the yurex driver was merged,
>> > so the llseek to yurex is now ignored.
>> >
>> > This patch add llseek fop with default_llseek to yurex driver
>> > to catch up to the change.
>> >
>> > Signed-off-by: Tomoki Sekiyama <tomoki.sekiyama@...il.com>
>>
>> It's in my queue, sorry, been without power and water at home for a few
>> days, will catch up on this stuff next week...
>
> I was out most of the week, so I didn't get to look at it either.
> Is there an actual bug here caused by having no .llseek function?
>
> As far as I can tell, you don't really want to seek this file
> anyway, so the default behaviour of disallowing llseek would actually
> make more sense.

I need seek because the device notifies the update of the sensor's value
by fasync, then the user can rewind(seek to 0) and re-read the file.

Thanks,
--
Tomoki Sekiyama
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