Message-ID: <54BEC3C2.7080906@fb.com>
Date: Tue, 20 Jan 2015 14:08:18 -0700
From: Jens Axboe <axboe@fb.com>
MIME-Version: 1.0
To: Christoph Hellwig <hch@lst.de>
CC: David Howells <dhowells@redhat.com>, Tejun Heo <tj@kernel.org>,
        <linux-fsdevel@vger.kernel.org>, <linux-mm@kvack.org>,
        <linux-mtd@lists.infradead.org>, <linux-nfs@vger.kernel.org>,
        <ceph-devel@vger.kernel.org>
Subject: Re: backing_dev_info cleanups & lifetime rule fixes V2
References: <1421228561-16857-1-git-send-email-hch@lst.de>
In-Reply-To: <1421228561-16857-1-git-send-email-hch@lst.de>
Content-Type: text/plain; charset="windows-1252"; format=flowed
Sender: linux-nfs-owner@vger.kernel.org

On 01/14/2015 02:42 AM, Christoph Hellwig wrote:
> The first 8 patches are unchanged from the series posted a week ago and
> cleans up how we use the backing_dev_info structure in preparation for
> fixing the life time rules for it.  The most important change is to
> split the unrelated nommu mmap flags from it, but it also remove a
> backing_dev_info pointer from the address_space (and thus the inode)
> and cleans up various other minor bits.
>
> The remaining patches sort out the issues around bdi_unlink and now
> let the bdi life until it's embedding structure is freed, which must
> be equal or longer than the superblock using the bdi for writeback,
> and thus gets rid of the whole mess around reassining inodes to new
> bdis.
>
> Changes since V1:
>   - various minor documentation updates based on Feedback from Tejun

I applied this to for-3.20/bdi, only making the change (noticed by Jan) 
to kill the extra WARN_ON() in patch #11.


-- 
Jens Axboe