linux-kernel - Re: [PATCH 0/2] fuse: fix regression in fuse_get_user

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Message-ID: <5410430E.5030804@parallels.com>
Date:	Wed, 10 Sep 2014 16:24:46 +0400
From:	Maxim Patlasov <mpatlasov@...allels.com>
To:	Miklos Szeredi <miklos@...redi.hu>
CC:	<viro@...iv.linux.org.uk>, <fuse-devel@...ts.sourceforge.net>,
	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
	<linux-fsdevel@...r.kernel.org>, <werner.baumann@...inehome.de>
Subject: Re: [PATCH 0/2] fuse: fix regression in fuse_get_user_pages()

On 09/10/2014 01:51 PM, Miklos Szeredi wrote:
> On Wed, Sep 03, 2014 at 02:10:23PM +0400, Maxim Patlasov wrote:
>> Hi,
>>
>> The patchset fixes a regression introduced by the following commits:
>>
>> c7f3888ad7f0 ("switch iov_iter_get_pages() to passing maximal number of pages")
>> c9c37e2e6378 ("fuse: switch to iov_iter_get_pages()")
>>
> Hmm, instead of reverting to passing maxbytes *instead* of maxpages, I think the
> right fix is to *add* the maxbytes argument.
>
> Just maxbytes alone doesn't have enough information in it.  E.g. 4096 contiguous
> bytes could occupy 1 or 2 pages, depending on the starting offset.
Yes, you are right. I missed that c7f3888ad7f0 fixed a subtle bug in 
get_pages_iovec().

>
> So how about the following (untested) patch?
Your patch works fine in my tests.

Thanks,
Maxim
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