From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: Christoph Hellwig <hch@lst.de>
Cc: linux-xfs@vger.kernel.org
Subject: Re: [PATCH 8/8] xfs: only clear preallocated COW blocks in xfs_reflink_clear_inode_flag
Date: Tue, 13 Mar 2018 13:56:04 -0700 [thread overview]
Message-ID: <20180313205604.GJ4865@magnolia> (raw)
In-Reply-To: <20180313143601.30028-9-hch@lst.de>
On Tue, Mar 13, 2018 at 03:36:01PM +0100, Christoph Hellwig wrote:
> Currently these are the only ones that should exist at this point anyway,
> but with O_ATOMIC writes we might have legit extents around in the COW
> fork even when clearing the reflink flag.
Hmmm... so I assume that the premise of the O_ATOMIC write series is
still that we use the cow fork to stage writes until fsync, and the
presence of a cow fork is now separate from the reflink inode flag?
Therefore, it's perfectly legit to have a !reflink inode with real
extents sitting in the cow fork and legit to be clearing the reflink
iflag with real extents sitting around.
I think this is ok but I'd sure like to see the atomic writes patches
before I pull this one in.
--D
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
> fs/xfs/xfs_reflink.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
> index 85d3379a81df..8ab9c73b430e 100644
> --- a/fs/xfs/xfs_reflink.c
> +++ b/fs/xfs/xfs_reflink.c
> @@ -1570,7 +1570,7 @@ xfs_reflink_clear_inode_flag(
> * We didn't find any shared blocks so turn off the reflink flag.
> * First, get rid of any leftover CoW mappings.
> */
> - error = xfs_reflink_cancel_cow_blocks(ip, tpp, 0, NULLFILEOFF, true);
> + error = xfs_reflink_cancel_cow_blocks(ip, tpp, 0, NULLFILEOFF, false);
> if (error)
> return error;
>
> --
> 2.14.2
>
> --
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next prev parent reply other threads:[~2018-03-13 20:56 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-13 14:35 misc fixes and cleanups Christoph Hellwig
2018-03-13 14:35 ` [PATCH 1/8] xfs: fix the check for COW extents in xfs_swap_extents Christoph Hellwig
2018-03-13 20:42 ` Darrick J. Wong
2018-03-13 14:35 ` [PATCH 2/8] xfs: don't use XFS_BMAPI_ENTRIRE in xfs_get_blocks Christoph Hellwig
2018-03-13 20:44 ` Darrick J. Wong
2018-03-13 14:35 ` [PATCH 3/8] xfs: assert that xfs_reflink_allocate_cow is called with XFS_ILOCK_EXCL Christoph Hellwig
2018-03-13 20:45 ` Darrick J. Wong
2018-03-13 14:35 ` [PATCH 4/8] xfs: remove xfs_zero_range Christoph Hellwig
2018-03-13 20:45 ` Darrick J. Wong
2018-03-13 14:35 ` [PATCH 5/8] xfs: minor cleanup for xfs_get_blocks Christoph Hellwig
2018-03-13 20:45 ` Darrick J. Wong
2018-03-13 14:35 ` [PATCH 6/8] xfs: minor cleanup for xfs_reflink_end_cow Christoph Hellwig
2018-03-13 20:46 ` Darrick J. Wong
2018-03-13 14:36 ` [PATCH 7/8] xfs: mark xfs_reflink_clear_inode_flag static Christoph Hellwig
2018-03-13 20:50 ` Darrick J. Wong
2018-03-14 8:42 ` Christoph Hellwig
2018-03-13 14:36 ` [PATCH 8/8] xfs: only clear preallocated COW blocks in xfs_reflink_clear_inode_flag Christoph Hellwig
2018-03-13 20:56 ` Darrick J. Wong [this message]
2018-03-14 8:42 ` Christoph Hellwig
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