linux-kernel - Re: [PATCH 0/7] overlayfs: fix ro/rw fd data inconsistecies

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Message-ID: <CAJfpegtdfSBPti9scGe7ztQ_DdsKAemfkQ=kxkbJbctj173Mnw@mail.gmail.com>
Date:   Thu, 24 Nov 2016 15:14:03 +0100
From:   Miklos Szeredi <miklos@...redi.hu>
To:     "linux-unionfs@...r.kernel.org" <linux-unionfs@...r.kernel.org>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Miklos Szeredi <mszeredi@...hat.com>
Subject: Re: [PATCH 0/7] overlayfs: fix ro/rw fd data inconsistecies

On Thu, Nov 24, 2016 at 11:55 AM, Miklos Szeredi <mszeredi@...hat.com> wrote:
> A file is opened for read-only, opened read-write (resulting in a copy up)
> and modified.  The data read back from the the read-only fd will be stale
> in this case (the read-only file descriptor still refers to the lower,
> unmodified file).
>
> This patchset fixes issues related to this corner case.
>
> The VFS impact is minimal and performance in the non-corner cases shouldn't
> suffer.

Git tree is here:

git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs.git #overlayfs-rorw

Thanks,
Miklos

> ---
> Miklos Szeredi (7):
>   vfs: allow overlayfs to intercept file ops
>   vfs: export filp_clone_open()
>   mm: ovl: copy-up on MAP_SHARED
>   ovl: add infrastructure for intercepting file ops
>   ovl: intercept read_iter
>   ovl: intercept mmap
>   ovl: intercept fsync
>
>  fs/internal.h            |   1 -
>  fs/open.c                |   2 +-
>  fs/overlayfs/inode.c     | 225 +++++++++++++++++++++++++++++++++++++++++++++++
>  fs/overlayfs/overlayfs.h |   2 +
>  fs/overlayfs/super.c     |   1 +
>  include/linux/fs.h       |   1 +
>  mm/util.c                |  22 +++++
>  7 files changed, 252 insertions(+), 2 deletions(-)
>
> --
> 2.5.5
>