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

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Message-ID: <20140903100826.23218.95122.stgit@localhost.localdomain>
Date:	Wed, 03 Sep 2014 14:10:23 +0400
From:	Maxim Patlasov <MPatlasov@...allels.com>
To:	viro@...iv.linux.org.uk
Cc:	miklos@...redi.hu, fuse-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org, werner.baumann@...inehome.de
Subject: [PATCH 0/2] fuse: fix regression in fuse_get_user_pages()

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()")

The regression manifests itslef like this (thanks to Werner Baumann for reporting):

> davfs2 uses the fuse kernel module directly (not using the fuse
> userspace library). A user of davfs2 reported this problem
> (http://savannah.nongnu.org/support/?108640):
> 
> dd if=/dev/zero of=/mnt/owncloud/test.txt bs=20416 count=1
> works fine, but
> dd if=/dev/zero of=/mnt/owncloud/test.txt bs=20417 count=1
> fails.

Thanks,
Maxim

---

Maxim Patlasov (2):
      vfs: switch iov_iter_get_pages() to passing maximal size
      fuse: fuse_get_user_pages(): do not pack more data than requested


 fs/direct-io.c      |    2 +-
 fs/fuse/file.c      |   13 +++++++++----
 include/linux/uio.h |    2 +-
 mm/iov_iter.c       |   17 +++++++++--------
 4 files changed, 20 insertions(+), 14 deletions(-)

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